An electrochemical cell is provided having a first electrode, such as a cathode, and a plurality of second electrodes, such as anodes, provided in a cell container. A plurality of cavities are formed within the cathode. A separator and anode are disposed within each of said cavities, and a current collector electrically connects the anodes together. According to one embodiment, a plurality of cylindrical anodes are provided. According to a second embodiment, a plurality of semi-cylindrical anodes are disclosed.

A sealing gasket of a cell comprises a circumferential marginal portion constricted between a metal casing and a terminal plate, a center collar through which a collector metal rod penetrates, and an intermediate portion integrally molded with the marginal portion and the center collar and having a thin wall portion tearable by a stretching force applied thereto. The center collar of the gasket is normally separated from the terminal plate but is movable toward the terminal plate by sliding on the collector metal rod in the event that the internal gas pressure within the cell is abnormally developed, whereby the thin wall portion of the gasket is stretched and torn to release the gas.

An electrochemical storage device comprises an electrolyte which forms an ignitable gas under certain conditions during use. The electrochemical storage device is constituted by a tank and a lid which is joined in a liquid-tight manner thereto and in which the terminal pillars are brought out at the top. Furthermore, it has a labyrinth-type pressure equalization connection built into the lid to connect to atmosphere the space situated above the electrolyte and enclosed by the housing. A separate, shape-adapted displacement body having an hermetically closed cavity is disposed in the space between the lid and the electrolyte surface so that the housing does not burst in the event of an ignition of the gas.

A cylindrical battery provided with a battery case acting also as one polarity terminal with a cylindrical one polarity electrode disposed inside, and another polarity terminal member connected electrically with a lead plate to another polarity electrode installed through a cylindrical separator in a hollow zone of said one polarity electrode, which comprises providing an annular descending wall placed closely upon a top opening inside peripheral edge of said cylindrical separator on the lower surface of an annular insulating packing for insulating the battery case and said another polarity terminal member, preventing the battery capacity reduction due to self-discharge.

A battery includes a pair of an anode electric power generating source element and a cathode electric power generating source element for generating an electric power, and a container receiving therein the electric power generating source elements. The container includes a breakable portion which is breakable such that a gas from at least a part of the electric power generating source elements is allowed to flow out of the container therethrough when a pressure in the container increases excessively. The battery further includes a variable throttle for the gas which is elastically deformable by the pressure in the container such that the gas is allowed to flow out of the container.