An ice cube producing unit comprising: a. a tray formed as an ice cube tray having at least two ice cube compartments, b. a lid which is suitable for being mounted on the tray to seal contents of the at least two ice cube compartments inside said at least two ice cube compartments, c. a displacing mechanism (6, 8, 10) connecting the tray and the lid and having two positions: i. a closed position (figure 11) where the lid is held in a position where it abuts the tray and ii. an open position (figure 12) where the lid is held in a position where it is separated from the tray so that an ice cube formed in the tray can leave the tray d. characterized in that the displacing mechanism comprises a first bi-stable element arranged between the lid and the tray, said first bi-stable element having a first stable state when the tray and the lid are in the closed position and a second stable state when the tray and lid are in the open position, e. in that the displacing mechanism further comprises a second bi-stable element arranged between the lid and the tray, said second bi-stable element having a first stable state when the tray and the lid are in the closed position and a second stable state when the tray and lid are in the open position, f. in that the first and second bi-stable elements (8,10) are arranged in series between the lid and the tray, g. in that the displacing mechanism further comprises a frame element arranged to extend around the periphery of the tray and the lid, said first bi-stable element being arranged between the frame element and the lid and said second bi-stable element being arranged between the frame element and the tray, h. in that the lid is also formed as an ice cube tray, the lid and the tray both having at least two ice cube compartments (3,5) and that in the closed position the lid and the tray are pressed together to define at least two common ice cube compartments (3,5) and that in the open position, the lid and the tray are separated to allow ice cubes formed in the at least two common ice cube compartments (3,5) to pass between the lid and the tray, i. in that the lid and the tray of the ice cube producing unit are arranged such that in the closed position of the unit, each of said at least two ice cube compartments is individually sealed and optionally j. in that the lid and the tray are arranged such that in the closed position of the unit there is a gap between the tray and the lid at the border (32,34) between at least two adjacent ice cube compartments (3a, 3b, 5a, 5b) to allow contents of the ice cube producing unit to move between the at least two ice cube compartments. a. a tray formed as an ice cube tray having at least two ice cube compartments, b. a lid which is suitable for being mounted on the tray to seal contents of the at least two ice cube compartments inside said at least two ice cube compartments, c. a displacing mechanism (6, 8, 10) connecting the tray and the lid and having two positions: i. a closed position (figure 11) where the lid is held in a position where it abuts the tray and ii. an open position (figure 12) where the lid is held in a position where it is separated from the tray so that an ice cube formed in the tray can leave the tray i. a closed position (figure 11) where the lid is held in a position where it abuts the tray and ii. an open position (figure 12) where the lid is held in a position where it is separated from the tray so that an ice cube formed in the tray can leave the tray d. characterized in that the displacing mechanism comprises a first bi-stable element arranged between the lid and the tray, said first bi-stable element having a first stable state when the tray and the lid are in the closed position and a second stable state when the tray and lid are in the open position, e. in that the displacing mechanism further comprises a second bi-stable element arranged between the lid and the tray, said second bi-stable element having a first stable state when the tray and the lid are in the closed position and a second stable state when the tray and lid are in the open position, f. in that the first and second bi-stable elements (8,10) are arranged in series between the lid and the tray, g. in that the displacing mechanism further comprises a frame element arranged to extend around the periphery of the tray and the lid, said first bi-stable element being arranged between the frame element and the lid and said second bi-stable element being arranged between the frame element and the tray, h. in that the lid is also formed as an ice cube tray, the lid and the tray both having at least two ice cube compartments (3,5) and that in the closed position the lid and the tray are pressed together to define at least two common ice cube compartments (3,5) and that in the open position, the lid and the tray are separated to allow ice cubes formed in the at least two common ice cube compartments (3,5) to pass between the lid and the tray, i. in that the lid and the tray of the ice cube producing unit are arranged such that in the closed position of the unit, each of said at least two ice cube compartments is individually sealed and optionally j. in that the lid and the tray are arranged such that in the closed position of the unit there is a gap between the tray and the lid at the border (32,34) between at least two adjacent ice cube compartments (3a, 3b, 5a, 5b) to allow contents of the ice cube producing unit to move between the at least two ice cube compartments.