Abstract: A charging method for a secondary battery includes charging a galvanic cell with a cooling system deactivated for as long as the cell temperature at a potentially hottest point of the galvanic cell is less than a defined activation temperature, where the defined activation temperature depends on a cell type and a starting temperature of the galvanic cell when the charging process is started, charging the galvanic cell with the cooling system switched to full load as soon as the cell temperature at the potentially hottest point reaches the defined activation temperature, and, as soon as a temperature change of the cell temperature at the potentially hottest point reaches zero: reducing a cooling capacity of the cooling system and controlling the cooling capacity such that the cell temperature at the potentially hottest point and/or at a potentially coldest point of the galvanic cell is kept substantially constant.

Abstract: Planar structural element, as a portion of a foam block, the foam block being made of a foamed plastics material, containing a plurality of stacked foam bodies and/or foam bodies made of body segments, which are arranged next to one another in a plane and connected to one another to form foam bodies and which have flat weld seams at their abutting faces, and the foam bodies being welded to one another at their abutting faces with the formation of flat weld seams to form the foam block. The weld seams between the foam bodies are interrupted by recesses at a spacing from one another. The planar structural element is preferably used as the core or core layer in sandwich composites, for example in rotor vanes of wind power plants.