Tab welded structure, battery cell, and power consuming apparatus

A tab welding method, comprising:

• providing an electrode assembly provided with a tab, the tab being formed by stacking a plurality of layers of pieces in a first direction;
• providing a conductive member;
• and
• welding the tab to the conductive member to form a fused area;
• wherein the fused area comprises:
• a first fused portion extending from the tab into the conductive member in the first direction;
• and
• a second fused portion demarcated from the first fused portion, the second fused portion being located at a side portion of the first fused portion, the second fused portion being configured to be connected to the first fused portion and the tab, and the second fused portion not extending into the conductive member;
• and
• wherein welding the tab to the conductive member to form the fused area comprises:
• performing a primary welding on the tab and the conductive member to form the first fused portion;
• and
• performing a secondary welding on the tab and the conductive member to form the second fused portion;
• wherein a welding temperature of the secondary welding is lower than a welding temperature of the primary welding.

A tab welded structure, comprising:

• a tab formed by stacking a plurality of layers of pieces in a first direction;
• and
• a conductive member welded to the tab to form a fused area;
• wherein the fused area comprises:
• a first fused portion extending from the tab into the conductive member in the first direction;
• and
• a second fused portion demarcated from the first fused portion, the second fused portion being located at a side portion of the first fused portion, and the second fused portion being configured to be connected to the first fused portion and the tab;
• wherein:
• the first fused portion is a solid fused area in a top view along the first direction;
• the second fused portion is arranged on an outer peripheral side of the first fused portion, and the second fused portion extends in a distributed manner in a peripheral direction of the first fused portion;
• and
• a welding temperature at which the conductive member and the tab are welded to form the second fused portion is less than a welding temperature at which the conductive member and the tab are welded to form the first fused portion.