Abstract: The invention provides an energy storage system, including: an energy storage converter having an AC end electrically connected to an AC power supply or a load, and a DC end electrically connected to a DC bus; at least one battery unit, each electrically connected to the DC bus through a DC/DC converter; and a start unit electrically connected between a battery unit and the DC bus. When the energy storage system starts through the battery unit, the start unit establishes a bus voltage to a set voltage through electric power of the battery unit. The energy storage system of the invention has black start capability, a simple structure and a low cost.

Abstract: The invention provides a bidirectional DC/DC converter, including: a low-voltage port having a first voltage; a high-voltage port; a start circuit having one end electrically connected to the low-voltage port; an inductor having one end electrically connected to the other end of the start circuit; and a switch circuit having both ends electrically connected to the high-voltage port and the other end of the inductor, respectively. The start circuit includes at least one controllable switch. When starting from the low-voltage port, a voltage of the high-voltage port is established using the first voltage, by controlling the at least one controllable switch. The bidirectional DC/DC converter has a self-start capability, and the voltage soft start way is flexibly controllable.

Abstract: A flying capacitor converter, a voltage converter and an energy storage system are provided. The flying capacitor converter includes a high-voltage side, a low-voltage side, a power switch unit, a current switch unit and a current detection unit. The high-voltage side is electrically connected with a first power source. The low-voltage side is electrically connected with a second power source. The power switch unit is electrically connected between the high-voltage side and the low-voltage side and includes three terminals and four power switches. The current switch unit is electrically connected with the high-voltage side, the low-voltage side and/or a common node. The current detection unit is electrically connected between a third terminal of the power switch unit and the common node. If the current detected by the current detection unit indicates that a short-circuit condition occurs, the power switch unit is disconnected from the high-voltage side and/or the low-voltage side.

Abstract: Provided is a power element assembly structure, including a main board, a first heat sink, a second heat sink, an insulating support, a power element, an insulating thermally conductive layer, and a fixture; where a first end of the insulating support is connected to the main board, a second end of the insulating support is connected to a bottom surface of the first heat sink, and there is a distance between the first heat sink and the main board, a top surface of the first heat sink is connected to the second heat sink; and the insulating thermally conductive layer is attached to a lateral surface of the first heat sink, the power element is attached to the insulating thermally conductive layer, and is fixed to the first heat sink by the fixture, and the power element is plugged on the main board.

Abstract: An energy storage module includes a bus connection part, a battery pack, a capacitor and a series compensation DC conversion device. A first conduction terminal of the series compensation DC conversion device is electrically connected with a positive bus connection terminal and a negative bus connection terminal of the bus connection part, or the first conduction terminal is connected with a battery positive terminal and a battery negative terminal of the battery pack. A second conduction terminal of the series compensation DC conversion device is electrically connected with two terminals of the capacitor. A four-quadrant DC/DC converter of the series compensation DC conversion device controls the capacitor to generate a compensation voltage to compensate a voltage between the two terminals of the battery pack, or the four-quadrant DC/DC converter adjusts a current flowing through the battery pack to a set value.

Abstract: An energy storage module with bypass circuit is provided. The energy storage module includes a first battery pack, a first capacitor, a bypass circuit and a bidirectional isolated converter. The first capacitor is electrically connected between the positive bus connection terminal and the first positive battery terminal or between the negative bus connection terminal and the first negative battery terminal. The bypass circuit is electrically connected to two terminals of the first capacitor. The first positive and negative connection terminals of the bidirectional isolated converter are electrically connected to the positive and negative bus connection terminals respectively or are electrically connected to the first positive and negative battery terminals respectively. The second positive and negative connection terminals of the bidirectional isolated converter are electrically connected to the two terminals of the first capacitor respectively.

Abstract: An energy storage system includes a DC bus, an energy storage converter, n first battery racks and m energy storage units. The DC bus has a positive bus and a negative bus. The energy storage converter is electrically connected to the DC bus. Each of the n first battery racks is electrically connected between the positive bus and the negative bus directly. Each of the m energy storage units includes a second battery rack and a DC/DC converter. The DC/DC converter is electrically connected between the corresponding second battery rack and the DC bus. The DC/DC converter performs electric energy conversion between the corresponding second battery rack and the DC bus.

Abstract: An energy storage module with bypass circuit is provided. The energy storage module includes a first battery pack, a first capacitor, a bypass circuit and a bidirectional isolated converter. The first capacitor is electrically connected between the positive bus connection terminal and the first positive battery terminal or between the negative bus connection terminal and the first negative battery terminal. The bypass circuit is electrically connected to two terminals of the first capacitor. The first positive and negative connection terminals of the bidirectional isolated converter are electrically connected to the positive and negative bus connection terminals respectively or are electrically connected to the first positive and negative battery terminals respectively. The second positive and negative connection terminals of the bidirectional isolated converter are electrically connected to the two terminals of the first capacitor respectively.

Abstract: An energy storage module includes a bus connection part, a battery pack, a capacitor and a series compensation DC conversion device. A first conduction terminal of the series compensation DC conversion device is electrically connected with a positive bus connection terminal and a negative bus connection terminal of the bus connection part, or the first conduction terminal is connected with a battery positive terminal and a battery negative terminal of the battery pack. A second conduction terminal of the series compensation DC conversion device is electrically connected with two terminals of the capacitor. A four-quadrant DC/DC converter of the series compensation DC conversion device controls the capacitor to generate a compensation voltage to compensate a voltage between the two terminals of the battery pack, or the four-quadrant DC/DC converter adjusts a current flowing through the battery pack to a set value.

Abstract: The present disclosure provides a high-voltage isolating device and method. The high-voltage isolating device includes a power module and a shelf. The power module's back panel is provided with a first connecting portion, and the power module's front panel is provided with a first fastening member. The shelf includes a module slot for accommodating the power module. The module slot's rear end is provided with a second connecting portion, and the module slot's front end is provided with a second fastening member. Wherein in a first status, the first connecting portion is matched and connected with the second connecting portion, and the first fastening member is away from the second fastening member, and in a second status, the first connecting portion is disconnected from the second connecting portion, and the first fastening member and the second fastening member are matched and connected together by a padlock.

Abstract: The present disclosure provides a high-voltage isolating device and method. The high-voltage isolating device includes a power module and a shelf. The power module's back panel is provided with a first connecting portion, and the power module's front panel is provided with a first fastening member. The shelf includes a module slot for accommodating the power module. The module slot's rear end is provided with a second connecting portion, and the module slot's front end is provided with a second fastening member. Wherein in a first status, the first connecting portion is matched and connected with the second connecting portion, and the first fastening member is away from the second fastening member, and in a second status, the first connecting portion is disconnected from the second connecting portion, and the first fastening member and the second fastening member are matched and connected together by a padlock.