H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 2/02 (2006.01) H01M 2/04 (2006.01) H01M 2/12 (2006.01)
Patent
CA 2126070
2126070 9312549 PCTABS00023 An electrochemical cell of cylindrical type, with a metal can (12), an anode (18), a separator (20) and a cathode (14) arranged concentrically in one another, an aqueous alkaline electrolyte solution, and a closure assembly. The closure assembly comprises a plastic top (28) inserted in the open end of the can (12) and has an outer cylindrical zone, a lower rim (40), a central portion (34) defining a central bore, and an intermediate portion (38) interconnecting the central portion with the lower rim. A current collector nail (26) is inserted through the central bore and penetrates deeply into the anode. A negative cap (24) of a metal sheet material forms the negative terminal of the cell. The negative cap has a flange portion (47) ending in an inwardly bent rim (48), the can has a bead (30) at a predetermined distance from its open end, and the bead serves as an abutment member for the closure assembly when inserted in the can. The plastic top defines a conforming support surface for the inwardly bent rim substantially at the connection zone of the outer cylindrical zone and the lower rim. The can has a gasket zone (31) above the bead, and a sealant is provided to cover the inside surface of the can at the gasket zone. The end portion of the gasket zone is crimped over the inwardly bent rim so that the outer cylindrical zone of the plastic top is pressed and crimped therebetween, whereby the inwardly bent rim provides a spring action pressing the outer cylindrical zone in radial direction towards the gasket zone and in axial direction towards the bead.
Battery Technologies Inc.
Mccarthy Tetrault Llp
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