Abstract: Disclosed is a battery system, including several parallel-connected battery clusters, each battery cluster being connected to a power conversion system via a battery bus, and any one of battery clusters includes several series-connected battery packs; pack equalizers, corresponding to the battery packs on a one-to-one basis, a first end of the pack equalizer being connected to two ends of a corresponding battery pack, and a second end thereof being connected to a power source; and a cluster equalizer, a first end of the cluster equalizer being connected in series to the battery packs, and a second end thereof being connected to the power source. According to the battery system, the pack equalizer is used between the battery packs to regulate the equalization of the battery packs in each cluster; in addition, each battery cluster is connected to the cluster equalizer to realize equalization regulation of the battery cluster.

Abstract: A main beam for wind turbine blade, comprising: one or more carbon fiber pultruded bodies, wherein, each carbon fiber pultruded body comprising one or more carbon fiber pultruded sheets, the carbon fiber pultruded sheets are stacked along the thickness direction and are formed by curing a first infusion material, wherein a glass fiber infusion material is arranged between every two carbon fiber pultruded sheets; one or more inlays, which are arranged adjacent to the carbon fiber pultruded body in a direction perpendicular to the thickness direction of the main beam; one or more overlays, which cover the carbon fiber pultruded bodies and/or the inlays on both sides in the thickness direction of the main beam; and a second infusion material, which impregnates carbon fiber pultruded bodies, the inlays and the overlays.

Abstract: A material core (100) for wind turbine blade, comprising: a core body (101); a first groove (102) extending from a first side (104) of the core body (101), in a first direction (106), into a depth d1 in the core body (101); and a second groove (103) extending from a second side (105) of the core body (101) facing away from the first side (104), in a direction opposite to the first direction (106), into a depth d2 in the core body (101), wherein the second groove (103) is parallel to the first groove (102), and wherein: d2=t?d1+x, 1 mm?x<d1, wherein t is a thickness of the core body (101), and wherein a distance between the first and second grooves is o, wherein: 1 mm?o?5 mm.

Abstract: A charging adapter for electric vehicle includes a connecting mechanism, a control board, a charging plug, a charging socket, a locking pressure plate and an electromagnet iron. The control board monitors the temperature change inside the charging adapter and control the switch-off. The charging plug and the charging socket are installed at two ends of the connecting mechanism respectively. When used, the charging plug is connected to a charging socket of the electric vehicle, and the charging socket is connected to a charging gun to activate an operating control system of the electric vehicle. The locking pressure plate is installed in a surface of the end of connection mechanism near the charging plug. The electromagnet iron is installed inside the connection mechanism and located under the locking pressure plate, and is combined with the locking pressure plate to lock the charging adapter with the charging socket of the electric vehicle.

Abstract: A turbine blade and a method of manufacturing the wind turbine, wherein the wind turbine blade comprises a composite structure and a surrounding layer. The composite structure comprises a stack of pultruded elements where an infusion-promoting layer is arranged between adjacent pairs of pultruded elements (18). The infusion-promoting layers have a higher permeability than the surrounding layer so that the resin flows at a higher speed within the stacked structure than in the surrounding layer.

Abstract: A main beam for wind turbine blade, comprising: one or more carbon fiber pultruded bodies, wherein, each carbon fiber pultruded body comprising one or more carbon fiber pultruded sheets, the carbon fiber pultruded sheets are stacked along the thickness direction and are formed by curing a first infusion material, wherein a glass fiber infusion material is arranged between every two carbon fiber pultruded sheets; one or more inlays, which are arranged adjacent to the carbon fiber pultruded body in a direction perpendicular to the thickness direction of the main beam; one or more overlays, which cover the carbon fiber pultruded bodies and/or the inlays on both sides in the thickness direction of the main beam; and a second infusion material, which impregnates carbon fiber pultruded bodies, the inlays and the overlays.

Abstract: The invention provides a method for monitoring health state of blade root fastener, comprising the following steps: obtaining a sequence of acceleration signals representing the lateral vibration of the nacelle and a sequence of rotational speed signals representing the rotational speed of the rotor; analyzing the sequence of acceleration signals and the sequence of rotational speed signals to determine the amplitude of the nacelle at 2-time-frequncy of the rotational speed of the rotor; and determining the health state of the blade root fastener based on the amplitude. The invention also provides a system for monitoring the health state of the blade root fastener. Through the present invention, the health state of the blade root fastener can be determined with low cost and high precision, thereby improving the operation efficiency and operation safety of the wind turbine.

Abstract: A material core (100) for wind turbine blade, comprising: a core body (101); a first groove (102) extending from a first side (104) of the core body (101), in a first direction (106), into a depth d1 in the core body (101); and a second groove (103) extending from a second side (105) of the core body (101) facing away from the first side (104), in a direction opposite to the first direction (106), into a depth d2 in the core body (101), wherein the second groove (103) is parallel to the first groove (102), and wherein: d2=t?d1+x, 1 mm?x<d1, wherein t is a thickness of the core body (101), and wherein a distance between the first and second grooves is o, wherein: 1 mm?o?5 mm.

Abstract: A charging adapter for electric vehicle includes a connecting mechanism, a control board, a charging plug, a charging socket, a locking pressure plate and an electromagnet iron. The control board monitors the temperature change inside the charging adapter and control the switch-off. The charging plug and the charging socket are installed at two ends of the connecting mechanism respectively. When used, the charging plug is connected to a charging socket of the electric vehicle, and the charging socket is connected to a charging gun to activate an operating control system of the electric vehicle. The locking pressure plate is installed in a surface of the end of connection mechanism near the charging plug. The electromagnet iron is installed inside the connection mechanism and located under the locking pressure plate, and is combined with the locking pressure plate to lock the charging adapter with the charging socket of the electric vehicle.

Abstract: An automatic charging vehicle, a method for operating the automatic charging vehicle, and an automatic charging system. The automatic charging vehicle includes: an automatic traveling module, which is configured to move, according to a route between the automatic charging vehicle and a device to be charged, to the device to be charged; a power module, which is configured to store and provide electric energy; and an automatic docking and separating device, which is configured to execute docking and separating between a first connector and a second connector capable of being in electrical contact with the first connector, the first connector and the second connector being used for transmitting electric energy.

Abstract: The invention relates to a method for controlling a mobile charging device, which comprises the following steps: receiving an order information from the user, the order information comprising the charging location where the electric vehicle will be charged; determining a navigation route between the mobile charging device and the charging location according to the order information; navigating the mobile charging device to the charging location according to the navigation route and connecting the mobile charging device with the charging interface; and charging the electric vehicle through the charging interface. The invention relates to a system of the same. Through the invention, the mobile charging device can be intelligently dispatched according to user needs and make it autonomously travel to the user's electric vehicle and charge it, thereby greatly optimizing the charging resources of the electric vehicle.

Abstract: A turbine blade and a method of manufacturing the wind turbine, wherein the wind turbine blade comprises a composite structure and a surrounding layer. The composite structure comprises a stack of pultruded elements where an infusion-promoting layer is arranged between adjacent pairs of pultruded elements (18). The infusion-promoting layers have a higher permeability than the surrounding layer so that the resin flows at a higher speed within the stacked structure than in the surrounding layer.

Abstract: An electric energy conversion and control device includes an electric energy conversion unit configured to perform electric energy conversion, a connection end of energy storage battery pack configured to connect to the energy storage battery pack, a safety device connected in a connection line between the electric energy conversion unit and the connection end of the energy storage battery pack to protect the electric energy conversion and control device from damage caused by excessive current, a DC circuit breaker connected in the connection circuit, a main contactor connected in the connection line, and a control module configured to control the electric energy conversion unit and monitor and manage the energy storage battery pack. The invention also relates to an energy storage system.

Abstract: A battery charging and discharging device, includes a power conversion unit configured to perform electrical conversion; a connecting end for the energy storage battery pack configured to connect an energy storage battery pack; a connecting end for charging and discharging configured to connect a charging power supply or a device to be charged or a load. A first charging switch and a second charging switch are arranged between the connecting end for charging and discharging and the input of the power conversion unit, and between the output of the power conversion unit and the connecting end for the energy storage battery pack respectively. A first discharging switch and a second discharging switch are arranged between the connecting end for the energy storage battery pack and the input of the power conversion unit, and between the output of the power conversion unit and the connecting end for charging and discharging respectively.