BATTERY CELL, BATTERY, AND ELECTRICAL DEVICE

A battery cell includes: an end cap assembly, including an electrode terminal; a housing, on which an opening is created, where the end cap assembly seals the opening; an electrode assembly, disposed in the housing, where the electrode assembly includes a tab; an adapter component, connected between the tab and the electrode terminal, where the adapter component includes a first connecting region configured to be connected to the electrode terminal, a second connecting region configured to be connected to the tab, a transitional connecting region located between the first connecting region and the second connecting region, and an embossed region including a plurality of friction bulges; and an insulation piece, covering at least a part of the transitional connecting region. The first connecting region is located inside the embossed region.