Secondary battery top cover assembly, secondary battery and vehicle

1. A secondary battery top cover assembly, comprising:

a top cover plate;

an electrode terminal disposed on the top cover plate;

an insulating cover; and

a short-circuit component comprising a deformable plate and a conductive plate disposed above the deformable plate, wherein the deformable plate is connected to the top cover plate, and the conductive plate is connected to the electrode terminal;

wherein the conductive plate comprises a body portion and a protruding portion protruding upwardly from the body portion, the conductive plate is provided with a gas hole, and the protruding portion surrounds the gas hole; and

wherein the insulating cover comprises a covering portion disposed above the conductive plate, the covering portion covers the protruding portion, a gas flow channel is formed between the protruding portion and the covering portion, and the gas hole communicates with outside of the top cover plate via the gas flow channel.

2. The secondary battery top cover assembly according to claim 1 , wherein a bottom surface of the covering portion is lower than a top surface of the protruding portion.

3. The secondary battery top cover assembly according to claim 1 , wherein a slit is formed between a bottom surface of the covering portion and a top surface of the conductive plate, and the slit communicates with the gas flow channel.

4. The secondary battery top cover assembly according to claim 3 , wherein an inner wall of the covering portion comprises a top wall and a side wall extending from an outer periphery of the top wall toward the conductive plate, a gap between the side wall and an outer wall of the protruding portion forms the gas flow channel, and a flow area of the gap is larger than a flow area of the slit.

5. The secondary battery top cover assembly according to claim 1 , wherein an inner wall of the covering portion is formed as an umbrella-like arc-shaped inner wall.

6. The secondary battery top cover assembly according to claim 1 , wherein the insulating cover comprises a body and an obstructing portion protruding from an edge of an outer contour of the body toward the conductive plate, and

wherein the covering portion is provided on the body, and the obstructing portion surrounds the covering portion.

7. The secondary battery top cover assembly according to claim 6 , wherein the insulating cover further comprises a protrusion extending from the body toward the conductive plate, the protrusion comprises a surrounding portion which surrounds the covering portion, space is formed between the surrounding portion and the covering portion, and a surface of the surrounding portion close to the conductive plate is located on a same plane as a surface of the covering portion close to the conductive plate.

8. The secondary battery top cover assembly according to claim 7 , wherein the obstructing portion is provided with a mouth, which allows gas in the gas hole to be expelled outside, and the protrusion further comprises a convoluted portion, and

wherein the convoluted portion is located outside of a region surrounded by the surrounding portion and is arranged at the mouth in a convoluted configuration.

9. The secondary battery top cover assembly according to claim 8 , wherein the convoluted portion is provided with a vent hole which penetrates the convoluted portion and the body so as to expel the gas in the gas hole.

10. The secondary battery top cover assembly according to claim 8 , wherein a surface of the obstructing portion facing towards the conductive plate is closer to an upper surface of the conductive plate than a surface of the convoluted portion facing towards the conductive plate, and the surface of the convoluted portion facing towards the conductive plate is closer to the upper surface of the conductive plate than a surface of the surrounding portion facing towards the conductive plate.

11. The secondary battery top cover assembly according to claim 7 , wherein the protrusion further comprises a plurality of separating portions, and each of the plurality of separating portions is connected to the surrounding portion and the obstructing portion so as to separate space between the surrounding portion and the obstructing portion into a plurality of subspaces, and

wherein a surface of the plurality of separating portions facing towards conductive plate is closer to the conductive plate than a surface of the obstructing portion facing towards the conductive plate.

12. The secondary battery top cover assembly according to claim 6 , wherein the insulating cover further comprises a mounting protrusion disposed on the obstructing portion, and the mounting protrusion is used to be snap-fixed to an insulating component provided at an outer edge of the conductive plate.

13. A secondary battery, comprising:

an electrode assembly;

a case for accommodating the electrode assembly; and

the secondary battery top cover assembly according to claim 1 ,

wherein the secondary battery top cover assembly seals an opening of the case, and the electrode terminal is connected to the electrode assembly.

14. A vehicle, comprising the secondary battery according to claim 13 .