Abstract: An energy storage device includes: a box body that includes two end portions in a left-right direction including openings; a first end cover assembly and a second end cover assembly respectively disposed on the two end portions of and detachably connected to the box body, to define an accommodating cavity; a battery management system in the box body and a battery module in the accommodating cavity. The battery management system and the battery module are disposed in an up-down direction. At least two battery core groups are disposed in the up-down direction. A plurality of battery cores is disposed side by side in a front-rear direction, and each battery core extends in the left-right direction. The battery module and the battery management system are removable from the accommodating cavity through the openings.

Abstract: A high-power four-quadrant converter system includes a double-secondary-side oil-immersed rectifier transformer with an output connected to four three-phase bridge type thyristor rectifiers, wherein every two rectifier bridges share a group of rectifier transformer secondary sides; two rectifier bridges sharing a group of rectifier transformer secondary sides are inversely connected in parallel, one of the two rectifier bridges realizes a forward output, and the other one realizes a reverse output; two groups of rectifier bridges which output in the same direction can operate independently or in parallel; when the two groups of rectifier bridges operate in parallel, reactors are connected in parallel to realize current sharing; and the rectifier bridges for the forward output and the reverse output realize free smooth transition under control of a controller, so that a four-quadrant operation of an output current is realized.

Abstract: The present disclosure provides a battery module and a battery pack. The battery module includes: multiple cells and an outer frame. The outer frame includes: four support columns, two side plates, and two end plates. The two side plates are arranged opposite to each other. The two end plates are arranged opposite to each other. The four support columns are respectively connected between end portions of the side plates and the end plates. One of a top and a bottom of the support column is provided with a support platform and another is provided with a fitting hole. The support platform of one battery module is fittable in the fitting hole of another battery module.

Abstract: The present disclosure provides a display method for operating systems, a display device for operating systems, and a multi-system terminal. The display method includes: running multiple operating systems simultaneously; and displaying each of the multiple operating systems in a preset display mode. The multi-system operating system that are run simultaneously is displayed on one or more display screens, and restarting a terminal is avoided when switching the operating systems, thus a user operates the multiple operating system simultaneously or separately, which facilitates user's operation and improves user's experience.

Abstract: The present disclosure provides a display method for operating systems, a display device for operating systems, and a multi-system terminal. The display method includes: running multiple operating systems simultaneously; and displaying each of the multiple operating systems in a preset display mode. The multi-system operating system that are run simultaneously is displayed on one or more display screens, and restarting a terminal is avoided when switching the operating systems, thus a user operates the multiple operating system simultaneously or separately, which facilitates user's operation and improves user's experience.

Abstract: The present invention provides a battery management apparatus for a portable power source, including: a monitoring unit used for monitoring a discharge voltage value and a discharge current value of a battery of the portable power source; and a regulation unit used for, when the discharge voltage value of the battery is lower than a first discharge voltage threshold, regulating the discharge current value according to the change of the discharge voltage value, till the discharge voltage value reaches a second discharge voltage threshold. Correspondingly, the present invention further provides a portable power source and a battery management method. By means of the technical solutions of the present invention, the electric quantity of the portable power source can be used to the greatest extent, so as to provide more electric quantity for a device that needs to be charged as much as possible.