The disclosure relates to an application device for mixing a plurality of components for producing a multicomponent mixture, a polyurethane foam, and for introducing and/or applying the multicomponent mixture into and/or onto an object, in particular a lithium-ion battery, comprising: a mixing tube with a first closed end and a second end for discharging the multicomponent mixture from the mixing tube, wherein the mixing tube comprises a mixing space, a plurality of injection units, which are each configured to inject one of the plurality of components into the mixing space at a corresponding position, and a mixer arranged in the mixing space, which mixer is configured to mix the injected components with one another. An application system comprising the application device and a method for mixing a plurality of components for producing a multicomponent mixture and for introducing and/or applying the multicomponent mixture into and/or onto an object is disclosed.

The disclosure relates to an application system for mixing a plurality of components for producing a multicomponent mixture, in particular a polyurethane foam, and for introducing and/or applying the multicomponent mixture into and/or onto an article, in particular a lithium-ion battery, wherein the application system comprises an application device. Furthermore, a method for mixing a plurality of components for producing a multicomponent mixture and for introducing and/or applying the multicomponent mixture into and/or onto an article is disclosed.