Abstract: A battery module according to the present disclosure comprises a cell stack comprising a plurality of battery cells; and a module case covering the outside of the cell stack. A module case comprises a first case comprising a rib and a first coupling portion that has a greater thickness than that of the rib and that is connected to a side of the rib; a second case comprising a second coupling portion facing an upper portion of the rib and a side of the first coupling portion; a tunnel portion formed between the rib, the first coupling portion, and the second coupling portion; and a welding portion in which a boundary area of the first coupling portion and the second coupling portion is welded.

Abstract: Microwave oven system with enhanced microwave radiation uniformity in a cooking chamber. The microwave oven includes a stirrer installed outside the cooking chamber and operable to vary a cavity volume or a cavity shape of the cooking chamber while the stirrer rotates for more uniform food cooking. The stirrer may be disk-shaped and can simultaneously rotate and move vertically to change the cavity volume of the cooking chamber during operation. Alternatively, the stirrer may be installed in an inclined angle and can change the cavity shape of the cooking chamber when rotating.

Abstract: An apparatus for converting gas using gliding plasma. The apparatus includes: a reaction chamber; an electrode member inside the reaction chamber and insulated from the reaction chamber; a power source applying electricity to the reaction chamber and the electrode member; a magnetic field generating unit installed outside the reaction chamber to rotate plasma induced inside the reaction chamber in a circumferential direction of the electrode member for forming a plasma region; and a gas supplying unit supplying material gas into the reaction chamber to allow the material gas to pass through the plasma region for converting the material gas into a different gas by energy received from the plasma. In the gas conversion apparatus, the plasma region can be widely formed in the reaction chamber to increase gas conversion rate.