Battery cell, battery, and electric apparatus

A battery cell, comprising:

• an electrode assembly, comprising a tab;
• a housing, configured to accommodate the electrode assembly;
• and
• an electrode terminal, disposed in the housing and electrically connected to the tab, the electrode terminal being provided with a first through hole, and the first through hole being configured for injecting an electrolyte into an inner space of the housing;
• wherein:
• the electrode assembly is a winding structure, and the electrode assembly has a second through hole at a winding center of the winding structure;
• the first through hole communicates with the second through hole, so that the electrolyte injected through the first through hole is capable of flowing into the second through hole;
• in an axial direction of the first through hole, a projection of the second through hole is greater than a projection of the first through hole;
• the electrode terminal is electrically connected to the tab through at least one welding portion;
• and
• the at least one welding portion includes a plurality of welding portions disposed at intervals in a circumferential direction of the first through hole, or the welding portion surrounds only part of the first through hole in the circumferential direction of the first through hole.