Cylindrical cell of electric batteries

Abstract

An electrochemical cell (10) comprising: - a cylindrical stack successively comprising a first electrode sheet, a first separator, a second electrode sheet, and a second separator; - a cylindrical housing (2) containing said stack, this housing comprising a cover (3), a base (4) incorporating a through-hole (41), and a lateral sleeve (5) connecting the cover to the base; - a metal rivet passing through the base via the through-hole; - a sealing gasket interposed between the metal rivet and the base; - the base comprising an annular rib (42) around the through-hole projecting from a first face of this base facing outwards from the housing so that the sealing gasket is compressed by the rivet against the annular rib. Figure for the abbreviation: Fig. 1.

Claims

measured in a radial direction of the opening orifice (41) is substantially equal to 0.5 times the thickness of the sealing gasket (7) measured in a direction perpendicular to the bottom (4).

5. Electrochemical cell (10) according to any one of the preceding claims, characterized in that the height of the annular rib (4 2) measured in a direction perpendicular to the bottom (4) is between 0.1 and 5 millimeters.

6. Electrochemical cell (10) according to any one of the preceding claims, characterized in that the bottom (4) comprises, on a second face opposite to the first face, an annular groove (43) around the opening orifice (41) so that the sealing gasket (7) is compressed by the rivet (6) against the annular groove (43).

7. Electrochemical cell (10) according to the preceding claim, characterized in that the distance between the annular groove (43) and the opening orifice (41), measured in a radial direction of the opening orifice (41), is between 1 and 4 times the thickness of the bottom (4).

8. Electrochemical cell (10) according to claim 6 or 7, characterized in that the width of the annular groove (43) measured in a radial direction of the opening orifice (41) is between 0.2 and 0.8 times the thickness of the sealing gasket (7) measured in a direction perpendicular to the bottom (4).

9. Electrochemical cell (10) according to claim 6 or 7, characterized in that the width of the annular groove (43) measured in a radial direction of the opening orifice (41) is substantially equal to 0.5 times the thickness of the sealing gasket (7) measured in a direction perpendicular to the bottom (4).

10. Electrochemical cell (10) according to any one of claims 6 to 9, characterized in that the depth of the annular groove (43) measured in a direction perpendicular to the bottom (4) is between 1 and 5 millimeters.

11. Electrochemical cell (10) according to any one of the preceding claims, characterized in that the compression ratio of the sealing joint (7) is between 60% and 85%.

Images