Abstract: An energy storage system and a control method thereof are provided. The control method includes steps of: (a) providing an energy storage system including N energy storage modules; (b) obtaining a first sequence and a second sequence by sorting the N energy storage units based on the quantity of electricity in descending order and ascending order respectively; (c) determining a required power of the power grid according to a grid frequency; (d) when the required power is positive, controlling first X energy storage units in the first sequence to discharge for collectively providing an electrical energy, having same magnitude with the required power, to the power grid; and (e) when the required power is negative, controlling first Y energy storage units in the second sequence to collectively receive an electrical energy, having same magnitude with the required power, from the power grid for charging.

Abstract: A water bottle structure includes a water bottle and a water bottle seat. The water bottle includes a bottle body and a lid to cover the mouth of the bottle body. The bottle body has an oblate shape. The bottle body has a bottom, a gradual enlarged portion, a gradual reduced portion, and a grasp portion. The bottom has an arc shape. The enlarged portion extends from the bottom to a middle portion of the bottle body. The reduced portion extends from the middle portion to an upper end of the bottle body. The grasp portion extends upward from the upper end of the bottle body and is slightly inclined toward the front of the bottle body. The water bottle seat includes a seat body and a receiving seat. The seat body has a plurality of holes at a circumferential portion thereof for insertion of a belt. The receiving seat is integrally formed with the seat body and extends forward from a bottom of the seat body.

Abstract: An assembly structure for a fan case comprising a first fan case, a second fan case and a fixing rod, the first fan case comprises a first frame, at least one first cavity surrounded by the first frame and a first axial hole recessed into the first frame, the first cavity comprises a first opening and a second opening corresponded to the first opening. The second fan case comprises a second frame, at least one second cavity surrounded by the second frame and a second axial hole recessed into the second frame, the second cavity comprises a third opening and a fourth opening corresponded to the third opening. The fixing rod is penetrated through the first axial hole of the first fan case and the second axial hole of the second fan case, and the fixing rod has an exposed-end portion which is protruded from the first fan case.

Abstract: The present invention provides a lamp for lightweight steel frame, comprising: a first frame, containing a power supply module at the back, at least two heat sinks at both sides of the power supply module, and a conductor for electrical connection with the power supply module; at least a LED assembly mounted in front of the first frame; the LED assembly is electrically connected with the conductor to form a spotted light source; at least a reflector used to convert the spotted light source into directional beam for projection into external environment; the reflector is installed within the front of first frame; a second frame for the lightweight steel frame, defining a space for covering the first frame; two diffusers arranged between the reflector and substrate, as well as a condenser between the diffusers. With this design, the reflector could project the directional beam into intended external environment for improved power consumption, environmental protection and illuminance.

Abstract: A light-emitting diode lamp which can be directly inserted into a lamp holder supplying AC power can utilize a power supply unit in a connector to supply the rectified and transformed power to an emission board to enable the light-emitting diodes on the emission board to emit light. Since the power consumption can be greatly reduced by using the light-emitting diodes, and the power supply unit or the emission board is replaceable, respectively, the requirements of environment protection and energy-saving can be satisfied.

Abstract: A bicycle rim assembly with multiple easily-assembled spokes has a rim, a hub and multiple spokes. The rim has multiple fastening holes. The spokes are mounted between the rim and the hub. Each spoke has an inner end and an offset end. The offset end has an inner bent part, an outer bent part and a connecting part. The inner and outer bent parts are bent to opposite directions and are formed on the offset end. The connecting part is formed between the inner and outer bent parts on the offset end. Because the inner and outer bent parts are bent to opposite directions, the offset end of the spoke is mounted securely in the fastening hole of the rim. Therefore, the spoke is easily assembled on the rim.