Battery cell, battery, and electrical device

A battery, comprising:

• a battery cell, comprising:
• a housing having an opening;
• a cover plate, configured to close the opening;
• an electrode assembly, disposed in the housing, wherein the electrode assembly comprises a main body and a tab extending from an end of the main body along a first direction, the cover plate is located on a side of the main body along a second direction, and the first direction is perpendicular to the second direction;
• a first insulation piece, disposed between the electrode assembly and the cover plate to dielectrically insulate the electrode assembly from the cover plate;
• and
• a second insulation piece, disposed between the main body and an inner surface of the housing to dielectrically insulate the tab from the housing;
• wherein:
• the second insulation piece and the first insulation piece are discretely disposed and connected to each other;
• the second insulation piece comprises a side plate and a first end plate, the side plate is located between the tab and the inner surface of the housing along the first direction, the side plate extends along a direction perpendicular to the first direction, the first end plate is connected to an end of the side plate facing the cover plate, and the first end plate is connected to the first insulation piece;
• the second insulation piece further comprises a second end plate, the second end plate is connected to another end of the side plate along the second direction, and the second end plate is disposed between the tab and the inner surface of the housing along the second direction to dielectrically insulate the tab from the housing;
• and
• an end of the tab facing away from the cover plate along the second direction comprises a curved face, and the second end plate is an arc-shaped plate that matches the curved face.

An electrical device, comprising:

• a battery, comprising a battery cell comprising:
• a housing having an opening;
• a cover plate, configured to close the opening;
• an electrode assembly, disposed in the housing, wherein the electrode assembly comprises a main body and a tab extending from an end of the main body along a first direction, the cover plate is located on a side of the main body along a second direction, and the first direction is perpendicular to the second direction;
• a first insulation piece, disposed between the electrode assembly and the cover plate to dielectrically insulate the electrode assembly from the cover plate;
• and
• a second insulation piece, disposed between the main body and an inner surface of the housing to dielectrically insulate the tab from the housing;
• wherein:
• the second insulation piece and the first insulation piece are discretely disposed and connected to each other;
• the second insulation piece comprises a side plate and a first end plate, the side plate is located between the tab and the inner surface of the housing along the first direction, the side plate extends along a direction perpendicular to the first direction, the first end plate is connected to an end of the side plate facing the cover plate, and the first end plate is connected to the first insulation piece;
• the second insulation piece further comprises a second end plate, the second end plate is connected to another end of the side plate along the second direction, and the second end plate is disposed between the tab and the inner surface of the housing along the second direction to dielectrically insulate the tab from the housing;
• and
• an end of the tab facing away from the cover plate along the second direction comprises a curved face, and the second end plate is an arc-shaped plate that matches the curved face.