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A compensation device for compensating a volumetric expansion of a medium during freezing has a receptacle provided in a structural component. The medium is contained in the receptacle. A sealing element is provided that delimits the receptacle. The sealing element is prestressed by a prestressing

A compensation device for compensating a volumetric expansion of a medium during freezing has a receptacle provided in a structural component. The medium is contained in the receptacle. A sealing element is provided that delimits the receptacle. The sealing element is prestressed by a prestressing force provided by a pressure spring against the operating pressure of the medium.

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What is claimed is: 1. A compensation device for compensating a volumetric expansion of a medium during freezing, the compensation device comprising: a receptacle provided in a structural component and configured to contain a medium; a sealing element delimiting the receptacle; wherein the sealin

What is claimed is: 1. A compensation device for compensating a volumetric expansion of a medium during freezing, the compensation device comprising: a receptacle provided in a structural component and configured to contain a medium; a sealing element delimiting the receptacle; wherein the sealing element comprises a bellows that is loaded on a first side by an operating pressure of the medium contained in the receptacle and is prestressed on a second side by a prestressing force acting against the operating pressure of the medium; a sleeve arranged inside the sealing element; a piston slidably mounted in the sleeve such that an end face of the piston rests against the second side of the bellows; at least one pressure spring arranged inside the piston and acting through the piston on the bellows to provide the prestressing force. 2. The device according to claim 1, wherein the sleeve has at least one stop for limiting a movement path of the piston. 3. The device according to claim 2, wherein the sleeve has a first end provided with a radial inwardly oriented flange, wherein the radial inwardly oriented flange forms the stop. 4. The device according to claim 2, wherein the sleeve has a second end provided with a holding part. 5. The device according to claim 4, wherein the holding part is a radial outwardly oriented flange. 6. The device according to claim 1, wherein the piston projects axially past the sleeve. 7. The device according to claim 1, wherein the sealing element is secured between the sleeve and an inner wall of the receptacle. 8. The device according to claim 1, wherein the sealing element has at least one holding member at an end remote from the bellows. 9. The device according to claim 8, wherein the holding member of the sealing element is a radial outwardly oriented flange. 10. The device according to claim 1, further comprising a lid secured in the receptacle, wherein the pressure spring is supported on the lid. 11. The device according to claim 1, wherein the medium is a urea-water solution. 12. A compensation device for compensating a volumetric expansion of a medium during freezing, the compensation device comprising: a receptacle provided in a structural component and configured to contain a medium; a sealing element delimiting the receptacle; wherein the sealing element is prestressed by a prestressing force against an operating pressure of the medium; wherein the sealing element comprises a bellows loaded on a first side by the operating pressure of the medium and on a second side by the prestressing force; a piston, wherein the bellows rests against an end face of the piston; a sleeve inserted into the receptacle, wherein the sealing element surrounds the sleeve across a portion of a length of the sleeve; wherein the sleeve has a second end provided with a holding part; wherein the holding part of the sleeve is secured by a crimped portion of the structural component. 13. A compensation device for compensating a volumetric expansion of a medium during freezing, the compensation device comprising: a receptacle provided in a structural component and configured to contain a medium; a sealing element delimiting the receptacle; wherein the sealing element is prestressed by a prestressing force against an operating pressure of the medium; wherein the sealing element comprises a bellows loaded on a first side by the operating pressure of the medium and on a second side by the prestressing force; a piston, wherein the bellows rests against an end face of the piston; a sleeve inserted into the receptacle, wherein the sealing element surrounds the sleeve across a portion of a length of the sleeve; wherein the sealing element has at least one holding member at an end remote from the bellows; wherein the holding member of the sealing element is a radial outwardly oriented flange; wherein the sleeve has a second end provided with a holding part and wherein the holding member of the sealing element is secured by the holding part of the sleeve. 14. The device according to claim 13, further comprising at least one pressure spring acting on the sealing element to provide the prestressing force.