VARTA Microbattery GmbH

An energy storage cell includes a housing comprising a metallic, tubular housing with a circular opening. The energy storage cell further includes an electrode-separator assembly winding having two terminal end faces and a wound jacket, the electrode-separator assembly comprising an anode, a cathode, and a separator. The energy storage cell additionally includes an at least partly metallic contact element in direct contact with and connected to current collector by welding. The contact element comprises a circular edge and closes the terminal circular opening of the tubular housing portion in a gas- and liquid-tight manner. The contact element is or comprises a metallic membrane electrically connected to a current collector. The metallic membrane is configured to, in response to a pressure in the housing exceeding a threshold, bend such that electrical contact between the contact element and the current collector is lost.

A battery includes a first battery module having a housing having at least one first marginal indentation on a housing exterior, and a second battery module having a housing having at least one second marginal indentation on a housing exterior, wherein the at least one connecting element holding the battery modules together includes a first end piece and a second end piece and a middle piece connecting the two end pieces, the first end piece is in the form of a holding means and form-fittingly engages in the first marginal indentation of the first battery module, the second end piece is in the form of a holding means and form-fittingly engages in the second marginal indentation of the second battery module, and introduced into the middle piece of the connecting element is an expansion means that expands the connecting element or the middle piece connecting the two end pieces.

An energy storage cell includes an electrode-separator assembly comprising a ribbon-shaped anode, a ribbon-shaped cathode, and a separator. The anode and the cathode are formed and/or arranged within the electrode-separator assembly, which is formed as a cylindrical winding with a first terminal end face and a second terminal end face, such that a free edge strip of a cathode current collector or a free edge strip of an anode current collector protrudes from the first terminal end face. The energy storage cell further includes a housing closed in an airtight and liquid-tight manner and enclosing an interior space in which the electrode-separator assembly is arranged. The housing includes a metallic housing cup and a lid assembly. The lid assembly includes a metallic contact element. The free edge strip protruding from the first terminal end face is welded to the contact element of the lid assembly.

An energy storage element includes an electrode-separator assembly in the form of a cylindrical winding having an anode, a separator, and a cathode. The anode includes a ribbon-shaped anode current collector with longitudinal edges and a free edge strip. The cathode includes a ribbon-shaped cathode current collector with longitudinal edges and a free edge strip. The energy storage element further includes a housing closed in an airtight and liquid-tight manner. A first longitudinal edge corresponding to a first free edge strip forms an area on which a metal part covering a first end face of the cylindrical winding lies flat, and a bottom of the housing includes an aperture into which a projection of the metal part is inserted or through which the projection protrudes.

A device for cutting a strip-shaped electrode foil into narrower strips has two parallel driven shafts and two pairs of circular blades that are attached to the shafts. An elastic element is arranged between the blades of one shaft and presses them against the blades on the other shaft. Each circular blade has a radially outwardly facing cylindrical outer surface and a flat annulus-shaped side surface that extends perpendicular to the respective axis of rotation and forms a circumferential cutting edge where it adjoins the outer surface. The cutting edges of the second circular blades have a similar construction, but face each other and are separated by a circumferential interspace. A non-destructively exchangeable spacer element is arranged between the two second circular blades, thereby determining the axial width of the interspace.

An electrochemical energy storage element has a winding assembly with at least two electrode strips wound spirally around a winding axis and at least one separator strip arranged between the electrode strips. The winding assembly has two terminal end faces and an axially aligned cavity in its center. A winding core is arranged in the cavity. In order to increase the safety of the energy storage element, an anchor element is arranged on at least one of the two terminal end faces, the anchor element being connected to the winding core. The anchor element projects laterally from the axial center of the winding assembly at least in certain regions over the end face of the winding assembly.

An energy storage element includes a housing that defines a longitudinal axis and an interior and comprises a metallic housing cup and a cover assembly that closes the housing cup. A seal arrangement having a seal radially encloses the cover assembly and seals against the housing cup. An electrode-separator composite has an anode, a separator, and a cathode. The anode includes an anode current collector, and the cathode includes a cathode current collector. A contact plate part is seated on a protrusion of the anode current collector and covers the first terminal end face of the electrode-separator composite and is connected thereto or is seated on a protrusion of the cathode current collector and covers the second terminal end face of the electrode-separator composite and is connected thereto. The housing cup is formed without a tool engagement structure.

An electrochemical energy storage cell includes a first electrically insulating substrate and a first electrical conductor layer extending on an area of the first electrically insulating substrate, a second electrically insulating substrate and a second electrical conductor layer extending on an area of the second electrically insulating substrate, a first electrode layer composed of positive electrode material, a second electrode layer composed of negative electrode material, a first separator layer, a stacked arrangement of the layers: the first electrically insulating substrate—the first electrical conductor layer—the first electrode layer—the first separator layer—the second electrode layer—the second electrical conductor layer—the second electrically insulating substrate, a first electrolyte enabling an ion flow between the electrode layers, an electrode region with the stacked arrangement of the electrode layers and a supercapacitor region, a second separator layer, a second electrolyte enabling an ion flow between the supercapacitor layers.

An energy storage cell includes a cylindrical housing that encloses an interior space and a housing casing, a wound composite body arranged in the interior space and having a helical structure including at least two electrode strips and at least one separator strip arranged between the electrode strips, each including a strip-shaped current collector having an active material coating, the wound composite body includes two terminal end faces, a circumferential outer composite body lateral surface and a circumferential inner composite body lateral surface, the inner composite body lateral surface defines an axially oriented cavity, a winding core having a substantially cylindrical or hollow cylindrical shape and has an outer circumferential surface that rests flat on the inner composite body lateral surface, and the winding core has a local deviation from the cylindrical or hollow cylindrical shape in at least one region of the outer circumferential surface.

A method of manufacturing an energy storage element includes providing an electrode-separator assembly, applying a contact sheet metal member to a terminal end face of the electrode-separator assembly, and welding a bridging sheet metal member onto the contact sheet metal member or fixing a bridging sheet metal member to the contact sheet metal member by forming an alternative material-locking connection or a form-locking connection. The method additionally includes inserting the electrode-separator assembly into a housing part and closing the housing part by a lid to form a closed housing. The method further includes welding the lid to the contact sheet metal member or to the bridging sheet metal member. The lid has at least one hole which, when the lid is welded on, allows pressure equalization between the two sides of the lid.