End cap, battery cell, battery, and power consuming device

An end cap of a battery cell, comprising:

• a first recess recessed from a side of the end cap facing toward an electrode assembly of the battery cell in a direction away from the electrode assembly;
• a second recess recessed from a side of the end cap facing away from the electrode assembly in a direction toward the electrode assembly, wherein a bottom wall of the second recess comprises a first part and a second part surrounding an outer side of the first part, and the first part and a bottom wall of the first recess are arranged opposite to each other in a thickness direction of the end cap;
• a pressure relief portion formed between the first part and the bottom wall of the first recess, wherein the pressure relief portion is configured to be actuated, in response to an internal pressure of the battery cell reaching a threshold, to relieve the internal pressure, and a side of the second part facing away from the electrode assembly forms an avoidance space to avoid the pressure relief portion when the pressure relief portion is actuated;
• a body portion comprising an inner surface and an outer surface arranged opposite to each other in the thickness direction, the inner surface facing toward the electrode assembly;
• a first protrusion protruding from the inner surface in the direction toward the electrode assembly with a first height, the first recess being recessed from a top end face of the first protrusion toward the direction away from the electrode assembly with a depth, the depth being smaller than the height, and in the thickness direction, a distance between the inner surface and the top end face of the first protrusion is greater than a distance between the top end face of the first protrusion and the bottom wall of the first recess;
• a connecting portion surrounding an outer side of the body portion and extending in the direction toward the electrode assembly to form a third recess on a side of the body portion facing toward the electrode assembly;
• and
• a plate portion surrounding an outer side of the connecting portion, the third recess being recessed relative to a surface of the plate portion facing toward the electrode assembly, and in the thickness direction of the end cap, the inner surface being closer to the outer surface than both a top surface and a bottom surface of the plate portion.

An end cap of a battery cell, comprising:

• a first recess recessed from a side of the end cap facing toward an electrode assembly of the battery cell in a direction away from the electrode assembly;
• a second recess recessed from a side of the end cap facing away from the electrode assembly in a direction toward the electrode assembly, wherein a bottom wall of the second recess comprises a first part and a second part surrounding an outer side of the first part, and the first part and a bottom wall of the first recess are arranged opposite to each other in a thickness direction of the end cap;
• a pressure relief portion formed between the first part and the bottom wall of the first recess, wherein the pressure relief portion is configured to be actuated, in response to an internal pressure of the battery cell reaching a threshold, to relieve the internal pressure, and a side of the second part facing away from the electrode assembly forms an avoidance space to avoid the pressure relief portion when the pressure relief portion is actuated;
• a body portion comprising an inner surface and an outer surface arranged opposite to each other in the thickness direction, the inner surface facing toward the electrode assembly;
• a connecting portion surrounding an outer side of the body portion and extending in the direction toward the electrode assembly to form a third recess on a side of the body portion facing toward the electrode assembly;
• and
• a plate portion surrounding an outer side of the connecting portion, the third recess being recessed relative to a surface of the plate portion facing toward the electrode assembly, and in the thickness direction of the end cap, the inner surface being closer to the outer surface than both a top surface and a bottom surface of the plate portion.