End cover assembly, energy storage device and electrical equipment

An end cover assembly comprising:

• an end cover provided with an through outlet hole penetrating therethrough;
• an electrode terminal arranged on one side of the end cover, wherein a projection, on the end cover, of the electrode terminal along a thickness direction of the end cover covers the outlet hole, and wherein a first gap surrounding the outlet hole is formed between the electrode terminal and the end cover;
• a sealing member comprising a first sealing portion, wherein the first sealing portion fills one side of the first gap close to the outlet hole;
• a plastic member comprising a first plastic portion, wherein the first plastic portion fills one side of the first gap away from the outlet hole;
• and
• a second gap formed between the first sealing portion and the first plastic portion,
• wherein:
• an edge of one side of the first gap close to the outlet hole is provided with a first protrusion, and the first protrusion is connected to the end cover;
• a second protrusion is arranged in the second gap, and the second protrusion is connected to the end cover and/or the electrode terminal;
• the first sealing portion is located between the first protrusion and the second protrusion;
• along a radial direction of the electrode terminal, a size of the first gap is D1, and a size of the second gap is D2, 0.2≤D2/D1≤0.0.3, 1.1 mm<D2<1.3 mm;
• and
• along an axial direction of the electrode terminal, a size of the first protrusion is H1, and a size of the second protrusion is H2, wherein 0.1 mm<H1<0.3 mm, and 0.1 mm<H2<0.3 mm.