BATTERY CELL AND BATTERY

The present application pertains to the field of battery technology and relates to a battery cell and a battery. The battery cell includes: a spiral-wound cell, a first current collector and a cover plate; the first current collector is connected to one end of the spiral-wound cell, the first current collector is provided with an electrolyte injection hole; the cover plate is connected to the first current collector, and the first current collector is located between the spiral-wound cell and the cover plate in order that the electrolyte injection hole is sealed by the cover plate. The battery includes the battery cell. According to the present application, the first current collector is connected with one end of the spiral-wound cell by welding, the electrolyte injection hole is provided on the first current collector, electrolytes are injected through the electrolyte injection hole, the cover plate is connected to the first current collector, and the first current collector is located between the spiral-wound cell and the cover plate. Thus, the electrolyte injection hole is sealed by the cover plate, a sealing of the electrolyte injection hole is quite ensured. Thus, a possibility of electrolyte leakage is reduced, and a safety of the battery cell is guaranteed.