Abstract: A method for producing an inter-cell cooling unit. A heat sink extending in a longitudinal extension direction is provided in the form of an extruded profile, which includes an interior with at least one cooling channel through which a coolant can flow, and which is delimited in the longitudinal extension direction by a first end region with a front-side first opening region which opens into the environment. A first connection unit with at least one first connection opening, which is different from the first opening region, is formed from the first end region.

Abstract: A gas filter system including a housing, a first filter element having a first filter medium and a second filter element having a second filter medium, the first and second filter elements being arranged inside the housing and the first filter medium and the second filter medium surrounding a common longitudinal axis, wherein a flexible sealing lip protrudes in the axial direction from the first filter medium, wherein the housing has a first sealing surface for sealing abutment against the sealing lip, wherein a rigid sealing rib protrudes from the second filter element, the sealing rib having a second sealing surface for sealing abutment against the sealing lip, wherein the sealing lip is compressed between the first sealing surface and the second sealing surface, and wherein the second sealing surface faces radially outwardly.

Abstract: A filter element has two filter bellows adjoining each other in an interface region between the outflow surface of one of the filter bellows and the inflow surface of the other. A circumferential seal in the interface region connects the filter bellows by material fusion. In transverse direction to the flow direction, one filter bellows has a small extension and the other a large extension larger than the small extension. The filter bellows are arranged such that, along an edge of the filter bellows with large extension, a free space in the interface region of the filter bellows with the large extension is not covered by the filter bellows with the small extension. In the free space region, the seal is connected by material fusion to the filter bellows with the large extension. A filter device with a two-part housing contains such a filter element.

Abstract: A gas filter system including an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, wherein the first filter medium is arrangeable to surround the second filter medium, wherein the first, third and fourth end caps are open, wherein the outer filter element is closed at the second end cap, wherein the outer filter element has an axial protrusion at the second end cap that protrudes into the inner filter element and exhibits a radially outward facing sealing surface, and wherein the fourth end cap of the inner filter element has a second sealing section for sealing abutment against the sealing surface of the protrusion.

Abstract: A gas filter system comprising an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, the first filter medium being arrangeable to surround the inner filter medium, wherein the first, second, third and fourth end caps are open.

Abstract: A gas filter system including a housing with a sealing projection and a housing groove; an outer filter element having a first filter medium with a first end cap and a second end cap; and an inner filter element having a second filter medium with a third end cap and a fourth end cap, wherein the first end cap has a first axial end cap projection and the third end cap has a second axial end cap projection, the end cap projections being arranged in the housing groove; the first and second end cap projections forming a common groove into which the sealing projection protrudes for sealing abutment against the first end cap and the third end cap at the common groove. The use of an outer filter element and/or an inner filter element in the gas filter system.

Abstract: A gas filter system including an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, wherein the first, second and third end caps are open, the inner filter element is closed at the fourth end cap, the first filter medium is arrangeable to surround the second filter medium, such that the first end cap of the outer filter element surrounds the third end cap of the inner filter element, the first and third end caps are sealed against each other, and such that the second end cap of the outer filter element surrounds the fourth end cap of the inner filter element, and the second and fourth end caps are sealed against each other.

Abstract: A gas filter system including an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, wherein the first, third and fourth end caps are open, wherein the outer filter element is closed at the second end cap, wherein the first filter medium is arrangeable to surround the second filter medium, such that the outer filter element is sealed against the inner filter element between the second end cap and the fourth end cap.

Abstract: A filter element for an air filter has a filter medium surrounding a longitudinal axis of the filter element and an open end disc arranged at a first end of the filter medium. A seal protrudes axially away from the open end disc. The seal has a radially inwardly positioned seal surface provided with at least one local radial recess or projection at the seal surface. An air filter provided with the filter element has an openable filter housing with a housing pot and a housing cover. The housing cover has a seal collar for seal-tightly contacting the seal surface of the seal with at least one radial bulge or depression. The at least one radial bulge corresponds to the at least one local radial recess. The at least one radial depression corresponds to the at least one local radial projection.

Abstract: An air filter has a filter housing having a raw air inlet and further has a filter element arranged in the filter housing. The filter element has a filter medium body and an end disk with a central primary air passage and a secondary air passage. The filter medium body annularly surrounds a longitudinal axis of the filter element and separates a raw side in the filter housing from a clean side inside the filter element. The filter housing has a primary air outlet communicating through the primary air passage with the clean side of the filter element. The filter housing has a secondary air outlet communicating through the secondary air passage with the clean side of the filter element. The secondary air outlet communicates with the secondary air passage through a channel arranged at the filter element, wherein the channel surrounds the primary air passage annularly and coaxially.

Abstract: The invention relates to a flat-filter filter element for filtering, e.g., air, for a filter system, e.g., of a fuel cell system, having an arrangement of at least two flat-filter medium bodies being arranged adjacent to each other in an axial direction so that the fluid can flow through them one after the other in the axial direction. The filter medium bodies each comprise a lateral band at their outer circumference. The lateral band of one of the filter medium bodies protrudes in axial direction over the other one of the filter medium bodies and at least partly overlaps the lateral band of the other of the filter medium bodies in an overlapping region, the lateral bands in the overlapping region being at least partially embedded in a circumferential cast element arranged at a downstream side of the arrangement of filter medium bodies.

Abstract: The invention relates to a flat-filter filter element for filtering a fluid, in particular for filtering air, for a filter system, in particular for an air filter system of a fuel cell system, having an arrangement of at least two flat-filter medium bodies being arranged adjacent to each other in an axial direction, so that the fluid can flow through them one after the other in the axial direction. The flat-filter filter element comprises an overmolded plastic frame that is directly molded to an outer circumference of one of the filter medium bodies, and the other one of the filter medium bodies is sealingly connected to the overmolded plastic frame by means of a circumferential cast element.

Abstract: A filter element for a filter system for filtering a fluid has a filter body with a zigzag-folded filter medium. A frame element and a seal connected to the frame element circumferentially surround a clean-side end face of the filter body. A lattice structure is arranged at the clean-side end face of the filter body. The frame element has a circumferentially extending annular structure connected by a connection structure to the lattice structure. The connection structure is embedded in the seal and has radially extending passages for interlocking seal and frame element. A sleeve surrounds, at least in sections, a wall surface of the filter body in axial direction and in the circumferential direction. The frame element is connected to the sleeve. A filter system is provided with such an exchangeable filter element.

Abstract: A round filter element for filtering gaseous fluid has a particle filter medium body and a separate noxious gas filter medium body arranged concentrically to the particle filter medium body. Particle filter medium body and noxious gas filter medium body surround an inwardly positioned flow chamber. A first common end plate flow-tightly covers a respective first end face of particle filter medium body and noxious gas filter medium body. A second common end plate flow-tightly covers a respective second end face of particle filter medium body and noxious gas filter medium body. A gas-permeable support element is arranged at a wall of the particle filter medium body or of the noxious gas filter medium body. The gas-permeable support element projects into material of at least one of the first and second common end plates and is fixedly connected thereto. A filter device is provided with such a filter element.

Abstract: A round filter element for gaseous fluid has a particle filter medium body formed as a hollow body for particle filtration and a separate harmful gas filter medium body formed as a hollow body for harmful gas filtration arranged concentrically to the particle filter medium body; together they surround an inner flow chamber. Particle filter medium body and harmful gas filter medium body each have opposed end faces with end disks. A flow-tight separate connection element is connected to an end disk of the particle filter medium body and engages a neighboring end disk of the harmful gas filter medium body or is connected to an end disk of the harmful gas filter medium body and engages a neighboring end disk of the particle filter medium body to produce a flow-tight connection with the neighboring end disk, respectively. A filter device is provided with such a round filter element.

Abstract: A round filter element for filtering gaseous fluid has a particle filter medium body and a separate noxious gas filter medium body arranged concentrically in relation to the particle filter medium body. The particle filter medium body and the noxious gas filter medium body surround an inwardly positioned flow chamber. A first common end plate flow-tightly covers a respective first end face of the particle filter medium body and of the noxious gas filter medium body. A second common end plate flow-tightly covers a respective second end face of the particle filter medium body and of the noxious gas filter medium body. The particle filter medium body is a filter bellows and the noxious gas filter medium body is a filter bellows. A filter device having a filter housing is provided with such a filter element.

Abstract: A filter system has a filter housing enclosing an interior space. An exchangeable filter element and a resonator structure are arranged in the interior space. The resonator structure has resonator housing elements forming a closed resonator housing enclosing a cavity in an intended state. A partition divides the cavity into a first and a second chamber. The partition has a passage through which the first and second chambers are acoustically coupled. The filter housing has a housing part providing one of the resonator housing elements. The filter element is provided with another one of the resonator housing elements. The filter element has a filter bellows and a cutout penetrating the filter bellows from an inflow side to an outflow side of the filter bellows. The cutout is a resonator housing receptacle. At least one of the resonator housing elements is arranged in the cutout.

Abstract: A filter element has a holder arrangement with a filter bellows and a partition element arranged at different regions of the holder arrangement. The partition element extends between first and second chambers of a resonator structure when installed in a filter system and has a passage acoustically coupling the two chambers. Such a filter element is exchangeably arranged in the filter housing of the filter system which has a main inlet, a main outlet, and an auxiliary connection outlet. The filter bellows is arranged in flow direction between the main inlet and the two outlets. The partition element is arranged between the two chambers of the resonator structure for noise damping of the auxiliary connection outlet. Its passage acoustically couples the two chambers. The partition element projects into an auxiliary connection resonator region of the filter housing and has end regions contacting walls delimiting the auxiliary connection resonator region.

Abstract: A battery arrangement having a housing lower part and a housing cover arranged on the housing lower part, and at least one battery module which is arranged in the battery arrangement and which has at least one battery cell. The at least one battery module has a first side defining an upper side and is arranged in the battery arrangement in such a way that the upper side of the battery module faces toward the housing cover and is at a distance from the housing cover in at least one region of the upper side. Furthermore, between the upper side of the battery module and the housing cover, a heat-conducting compound that completely fills a space between the at least one region of the upper side and the housing cover is arranged.

Abstract: A filter element for filtering a fluid has a zigzag-shaped filter bellows with folds having parallel fold tips successively arranged in length extension of the filter bellows transverse to a vertical axis of the filter bellows. The fold tips extend between longitudinal sides of the filter bellows which are parallel to the length extension. The filter bellows is arranged in a continuous frame and surrounded by the continuous frame. The continuous frame has at least one first frame segment and at least one second frame segment, wherein the first frame segment has a hardness different from a hardness of the second frame segment. The first frame segment is formed of a first hard material and the second frame segment is formed of a second soft material. The filter bellows is fixed in the second frame segment. A filter system has such a filter element arranged in a filter housing.