Top cover structure of power battery and power battery

Patent metadata

Field	Value
Publication number	US-2016365547-A1
Application number	US-201615179921-A
Country	US
Kind code	A1
Filing date	Jun 10, 2016
Priority date	Jun 11, 2015
Publication date	Dec 15, 2016
Grant date	—

Abstract

The top cover structure of the power battery includes a cap plate, a cathode column, a conducting piece and a reversing piece, the conducting piece is electrically connected with the cathode column, the cathode column is insulatedly assembled with the cap plate; the reversing piece includes a welding part, a embossment with a solid core structure and a joint part arranged between the welding part and the embossment, the embossment is arranged at the center of the joint part, the welding part is arranged on the outer margin of the joint part; the welding part is electrically connected with the cap plate, the embossment does not contact the conducting piece, when the pressure inside the power battery increases, the reversing piece receives the pressure inside the power battery, and moves upwards, so that the embossment is electrically connected to the conducting piece.

First claim

What is claimed is:

1 . A top cover structure of a power battery, comprising a cap plate, a cathode column, a conducting piece and a reversing piece, wherein the conducting piece is electrically connected with the cathode column, the cathode column is insulatedly assembled with the cap plate, characterized in that, the reversing piece comprises a welding part, an embossment of a solid core structure and a joint part arranged between the welding part and the embossment, the embossment is arranged at the center of the joint part, the welding part is arranged at the outer margin of the joint part; the welding part is electrically connected with the cap plate, the embossment does not contact with the conducting piece, and when pressure inside the power battery increases, the reversing piece receives the pressure inside the power battery, and moves upward, so that the embossment is electrically connected to the conducting piece.

2 . The top cover structure of the power battery according to claim 1 , characterized in that, thickness of the joint part gradually decreases in a direction from inside to outside.

3 . The top cover structure of the power battery according to claim 2 , characterized in that, thickness of the embossment is larger than that of the joint part.

4 . The top cover structure of the power battery according to claim 1 , characterized in that, an upper surface of the embossment is a cambered surface.

5 . The top cover structure of the power battery according to claim 4 , characterized in that, the upper surface of the embossment is a spherical surface or an arch surface structure.

6 . The top cover structure of the power battery according to claim 5 , characterized in that, the upper surface of the embossment extends to the joint part.

7 . The top cover structure of the power battery according to claim 1 , characterized in that, an upper surface of the embossment is a flat surface.

8 . The top cover structure of the power battery according to claim 7 , characterized in that, the embossment is of a cylinder structure.

9 . The top cover structure of the power battery according to claim 1 , characterized in that, a reversing piece connection hole is provided on the cap plate, the conducting piece extends to the above of the reversing piece connection hole, the reversing piece is arranged in the reversing piece connection hole, the welding part is sealed and welded with an inner wall of the reversing piece connection hole.

10 . The top cover structure of the power battery according to claim 9 , characterized in that, a circle of recess is provided at edge of an end of the reversing piece connection hole, the welding part is arranged in the recess, and is welded with a side wall of the recess.

11 . The top cover structure of the power battery according to claim 10 , characterized in that, the recess is provided at a bottom end of the reversing piece connection hole.

12 . The top cover structure of the power battery according to claim 11 , characterized in that, the welding part is parallel and level to a lower surface of the cap plate.

13 . The top cover structure of the power battery according to claim 10 , characterized in that, the recess is provided at a top end of the reversing piece connection hole.

14 . The top cover structure of the power battery according to claim 13 , characterized in that, the welding part is parallel and level to an upper surface of the cap plate.

15 . The top cover structure of the power battery according to claim 12 , characterized in that, the upper surface and the lower surface of the welding part are both flat surfaces.

16 . The top cover structure of the power battery according to claim 1 , characterized in that, the welding part, the joint part and the embossment are integrated as a whole structure.

17 . A power battery, characterized in that, the top cover structure of the power battery adopts the top cover structure of the power battery according to claim 1 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Li Quankun
• Deng Pinghua
• Wang Peng
• Wu Kai
• Jiang Junjie

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M50/1535 Primary

  adapted for specific cells, e.g. electrochemical cells operating at high temperature · CPC title

• H01M50/152

  for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence) · CPC title

• H01M2/0456

  Electricity · mapped topic