Battery frames; battery holders; battery housing covers; separation systems and elements being parts of electrochemical cells, including redox flow batteries and electrolyzers, for separating chemical energy carriers; battery cell frames; battery cells; battery separators; membranes for ion exchange in redox flow batteries; electrolysis membranes being parts of electrochemical cells, including redox flow batteries and electrolyzers; electrolysis membranes being part of ion exchange devices fo...