Energy complementing system and energy complementing method applied to energy complementing system

Abstract

The invention provides an energy complementing system and an energy complementing method applied to the energy complementing system, and the energy complementing system comprises a first energy storage converter used for converting a first alternating current into a first direct current, a second energy storage converter used for converting the first alternating current into a second direct current, a first DC / DC converter used for converting the first direct current into a third direct current, and a second DC / DC converter used for converting the third direct current into a fourth direct current. The second DC / DC converter is used for converting the first direct current into fourth direct current; the first battery pack is used for storing third direct current; the first direct current is also used for charging the first battery cluster, the second direct current is used for charging the second battery cluster, and the fourth direct current is used for charging the second battery pack; after the first battery cluster is used for outputting first preset direct current to the first energy storage converter, the first energy storage converter is further used for converting the first preset direct current into second alternating current, and the second energy storage converter is further used for converting the second alternating current into second preset direct current to charge the second battery cluster; according to the invention, the battery cluster can be charged quickly.

Description

Technical Field

[0001] This application relates to the field of new energy technologies, and particularly to an energy replenishment system and an energy replenishment method applied to the energy replenishment system. Background Art

[0002] When the traditional large-scale energy storage station replenishes power for the battery cluster, it is necessary to connect the commercial power to provide the replenishment energy. In the case of an uncompleted input power supply system or an uncompleted energy storage converter system, the energy storage station will not be able to replenish power for the battery cluster. Summary of the Invention

[0003] To solve the above technical problems, this application provides an energy replenishment system and an energy replenishment method applied to the energy replenishment system. Among them, the energy replenishment system includes: a first energy storage converter, a second energy storage converter, a first DC / DC converter, a second DC / DC converter, a first battery pack and a controller. Among them, after the first battery cluster is used to output a first preset direct current to the first energy storage converter, the first energy storage converter is further used to convert the first preset direct current into a second alternating current, and the second energy storage converter is further used to convert the second alternating current into a second preset direct current to charge the second battery cluster. The technical problem of replenishing power for the battery cluster when the input power supply system is not completed or the energy storage converter system is not completed can be solved.

[0004] In a first aspect, this application provides an energy replenishment system, where the energy replenishment system includes: A first energy storage converter for converting a first alternating current into a first direct current, and a second energy storage converter for converting the first alternating current into a second direct current; A first DC / DC converter for converting the first direct current into a third direct current, and a second DC / DC converter for converting the first direct current into a fourth direct current, where the voltage of the first direct current is different from the voltage of the third direct current, and the voltage of the first direct current is different from the voltage of the fourth direct current; A first battery pack for storing the third direct current; and A controller, where the controller is used to send control instructions for performing power conversion to the first energy storage converter, the second energy storage converter, the first DC / DC converter or the second DC / DC converter respectively; Wherein, the first direct current is further used to charge the first battery cluster, the second direct current is used to charge the second battery cluster, and the fourth direct current is used to charge the second battery pack; after the first battery cluster is used to output a first preset direct current to the first energy storage converter, the first energy storage converter is further used to convert the first preset direct current into a second alternating current, and the second energy storage converter is further used to convert the second alternating current into a second preset direct current to charge the second battery cluster; Among them, the first direct current, the second direct current, the third direct current, the fourth direct current, the first preset direct current, and the second preset direct current are all direct currents; the first alternating current and the second alternating current are both alternating currents.

[0005] In an alternative embodiment, the energy replenishment system further includes any one or more of the following: An auxiliary power source for storing the third direct current, a transformer for converting the first alternating current into the third alternating current, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch; wherein, The third alternating current is used to supply power or charge an electrical device. The first switch is disposed on the line where the input interface for inputting the first alternating current is respectively coupled to the first energy storage converter, the second energy storage converter, and the transformer. The second switch is disposed on the line where the first energy storage converter is coupled to the first DC / DC converter. The third switch is disposed on the line where the first energy storage converter is coupled to the first battery cluster. The fourth switch is disposed on the line where the first DC / DC converter is coupled to the auxiliary power source. The fifth switch is disposed on the line where the transformer is coupled to the electrical device. The sixth switch is disposed on the line where the second energy storage converter is coupled to the second battery.

[0006] In an alternative embodiment, the first DC / DC converter is further configured to convert the first preset direct current output by the first battery cluster into a third preset direct current, wherein the third preset direct current is used to charge the first battery pack.

[0007] In an alternative embodiment, the second DC / DC converter is further configured to convert the first preset direct current output by the first battery cluster into a fourth preset direct current, wherein the fourth preset direct current is used to charge the second battery pack.

[0008] In an alternative embodiment, the first battery pack is further configured to output a fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is further configured to convert the fifth preset direct current into a sixth preset direct current to charge the first battery cluster.

[0009] In an alternative embodiment, the first battery pack is further configured to output a fifth preset direct current to the first DC / DC converter, the first DC / DC converter is further configured to convert the fifth preset direct current into a sixth preset direct current, the first energy storage converter is configured to convert the sixth preset direct current into a fourth alternating current, and the second energy storage converter is configured to convert the fourth alternating current into a seventh preset direct current to charge the second battery cluster.

[0010] In an alternative embodiment, the first battery pack is further configured to output a fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is further configured to convert the fifth preset direct current into a sixth preset direct current, and the second DC / DC converter is further configured to convert the sixth preset direct current into an eighth preset direct current to charge the second battery pack.

[0011] In an alternative embodiment, the second DC / DC converter is further configured to convert a ninth preset direct current output by the second battery pack into a tenth preset direct current, wherein the tenth preset direct current is used to charge the first battery cluster.

[0012] In an alternative embodiment, the second DC / DC converter is further configured to convert a ninth preset direct current output by the second battery pack into a tenth preset direct current, the first energy storage inverter is further configured to convert the tenth preset direct current into a fifth alternating current, and the second energy storage inverter is further configured to convert the fifth alternating current into an eleventh preset alternating current, wherein the eleventh preset alternating current is used to charge the second battery cluster.

[0013] In an alternative embodiment, the second DC / DC converter is further configured to convert a ninth preset direct current output by the second battery pack into a tenth preset direct current, and the first DC / DC converter is further configured to convert the tenth preset direct current into a twelfth preset direct current, wherein the twelfth preset direct current is used to charge the first battery pack.

[0014] In a second aspect, the present application provides an energy replenishment method applied to the first aspect, including: Controlling, by a controller, the first energy storage inverter to convert a first alternating current into a first direct current, and controlling the second energy storage inverter to convert the first alternating current into a second direct current; Controlling, by a controller, the first DC / DC converter to convert the first direct current into a third direct current, and controlling the second DC / DC converter to convert the first direct current into a fourth direct current; After the first battery cluster is used to output a first preset direct current to the first energy storage inverter, controlling, by a controller, the first energy storage inverter to convert the first preset direct current into a second alternating current, and controlling the second energy storage inverter to convert the second alternating current into a second preset direct current to charge the second battery cluster.

[0015] In an alternative embodiment, controlling, by a controller, the first DC / DC converter to convert a first preset direct current output by the first battery cluster into a third preset direct current to charge the first battery pack through the third preset direct current.

[0016] In an alternative embodiment, the controller controls the second DC / DC converter to convert the first preset direct current output by the first battery cluster into a fourth preset direct current to charge the second battery pack with the fourth preset direct current.

[0017] In an alternative embodiment, the energy replenishment method further includes: when the first DC / DC converter receives the fifth preset direct current output by the first battery pack, the controller controls the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current to charge the first battery cluster; or, when the first DC / DC converter receives the fifth preset direct current output by the first battery pack, the controller controls the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current, the controller controls the first energy storage inverter to convert the sixth preset direct current into a fourth alternating current, and the controller controls the second energy storage inverter to convert the fourth alternating current into a seventh preset direct current to charge the second battery cluster; or, when the first DC / DC converter receives the fifth preset direct current output by the first battery pack, the controller controls the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current, and the controller controls the second DC / DC converter to convert the sixth preset direct current into an eighth preset direct current to charge the second battery pack.

[0018] In an alternative embodiment, the energy replenishment method further includes: the controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current to charge the first battery cluster with the tenth preset direct current; or, the controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, the controller controls the first energy storage inverter to convert the tenth preset direct current into a fifth alternating current, and the controller controls the second energy storage inverter to convert the fifth alternating current into an eleventh preset alternating current to charge the second battery cluster with the eleventh preset alternating current; or, the controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, and the controller controls the first DC / DC converter to convert the tenth preset direct current into a twelfth preset direct current to charge the first battery pack with the twelfth preset direct current.

[0019] In a third aspect, the present application provides another energy replenishment method applied to an energy replenishment system, including: The energy replenishment system includes: a first energy storage inverter for converting a first alternating current into a first direct current, and a second energy storage inverter for converting the first alternating current into a second direct current; A first DC / DC converter for converting a first direct current into a third direct current, and a second DC / DC converter for converting the first direct current into a fourth direct current, wherein the voltage of the first direct current is different from the voltage of the third direct current, and the voltage of the first direct current is different from the voltage of the fourth direct current; A first battery pack for storing the third direct current; and A controller for sending control instructions for power conversion to the first energy storage inverter, the second energy storage inverter, the first DC / DC converter or the second DC / DC converter respectively; Wherein, the first direct current is also used to charge a first battery cluster, the second direct current is used to charge a second battery cluster, and the fourth direct current is used to charge a second battery pack; after the first battery cluster outputs a first preset direct current to the first energy storage inverter, the first energy storage inverter is further used to convert the first preset direct current into a second alternating current, and the second energy storage inverter is further used to convert the second alternating current into a second preset direct current to charge the second battery cluster; the first direct current, the second direct current, the third direct current, the fourth direct current, the first preset direct current, and the second preset direct current are all direct currents respectively; the first alternating current and the second alternating current are both alternating currents respectively; The energy replenishment system further includes any one or more of the following: An auxiliary power supply for storing the third direct current, a transformer for converting the first alternating current into a third alternating current, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch; wherein, The third alternating current is used to supply power to or charge an electrical device; The first switch is disposed on the lines connecting the input interface for inputting the first alternating current to the first energy storage inverter, the second energy storage inverter, and the transformer respectively; The second switch is disposed on the line connecting the first energy storage inverter and the first DC / DC converter for coupling; The third switch is disposed on the line connecting the first energy storage inverter and the first battery cluster for coupling; The fourth switch is disposed on the line connecting the first DC / DC converter and the auxiliary power supply for coupling; The fifth switch is disposed on the line connecting the transformer and the electrical device for coupling; The sixth switch is disposed on the line connecting the second energy storage inverter and the second battery for coupling; The energy replenishment method includes: When the first switch, the third switch, and the sixth switch are all closed, the controller controls the first energy storage converter to convert the first alternating current into the first direct current, and controls the second energy storage converter to convert the first alternating current into the second direct current. The first direct current is used to charge the first battery cluster, and the second direct current is used to charge the second battery cluster.

[0020] This application provides an energy replenishment system and an energy replenishment method applied to the energy replenishment system. The energy replenishment system includes: a first energy storage converter, a second energy storage converter, a first DC / DC converter, a second DC / DC converter, a first battery pack, and a controller. The first battery cluster is used to output a first preset direct current to the first energy storage converter. The first energy storage converter is further used to convert the first preset direct current into a second alternating current, and the second energy storage converter is further used to convert the second alternating current into a second preset direct current to charge the second battery cluster. By adopting this application, since the first energy storage converter is further used to convert the first preset direct current into a second alternating current, and the second energy storage converter is further used to convert the second alternating current into a second preset direct current to charge the second battery cluster, the technical problem of charging the battery cluster when the input power supply system is not built or the energy storage converter system is not built can be solved. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a system topology schematic diagram of an energy replenishment system provided by this application; Figure 2 It is a system topology schematic diagram of another energy replenishment system provided by this application; Figure 3 It is a flowchart of an energy replenishment method applied to an energy replenishment system provided by this application. Detailed Embodiments

[0023] Next, the technical solutions in this application will be clearly and completely described in conjunction with the drawings in this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

[0024] It should be noted that the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, and fourteenth in this application are only used to distinguish different components, direct current, preset direct current, alternating current, switches, etc., and have no other meanings, and should not limit the protection scope of this application.

[0025] See Figure 1 , which is a topological schematic diagram of an energy replenishment system provided by this application. As Figure 1 shown, specifically, the energy replenishment system may include but is not limited to the following components: A first energy storage inverter for converting the first alternating current input by the input interface into the first direct current, and a second energy storage inverter for converting the first alternating current into the second direct current; wherein, the input interface may also be an interface integrated in the energy replenishment system; A first DC / DC (Direct Current to Direct Current Converter) converter for converting the first direct current into the third direct current, and a second DC / DC converter for converting the first direct current into the fourth direct current, wherein the voltage of the first direct current is different from the voltage of the third direct current, and the voltage of the first direct current is different from the voltage of the fourth direct current; A first battery pack for storing the third direct current; and A controller, wherein the controller is used to send control instructions for power conversion to the first energy storage inverter, the second energy storage inverter, the first DC / DC converter or the second DC / DC converter respectively. For example, the controller may include but is not limited to: a data processing unit (DPU) or a dedicated processor.

[0026] Among them, the first direct current is also used to charge the first battery cluster, the second direct current is used to charge the second battery cluster, and the fourth direct current is used to charge the second battery pack; after the first battery cluster outputs the first preset direct current to the first energy storage inverter, the first energy storage inverter is also used to convert the first preset direct current into the second alternating current, and the second energy storage inverter is also used to convert the second alternating current into the second preset direct current to charge the second battery cluster; it should be noted that after the first preset direct current is input into the first energy storage inverter, it can also be used to start the first energy storage inverter and to debug the first energy storage inverter after startup, in order to prevent abnormal problems that may occur when the first energy storage inverter is connected to the mains / diesel generator without debugging the first energy storage inverter.

[0027] After the first battery cluster is used to output a first preset direct current to the first energy storage inverter, the first energy storage inverter is further used to convert the first preset direct current into a second alternating current, and the second energy storage inverter is further used to convert the second alternating current into a second preset direct current to charge the second battery cluster. It can also solve the technical problem of charging the battery cluster when the input power supply system is not built or the energy storage inverter system is not built.

[0028] Among them, the first direct current, the second direct current, the third direct current, the fourth direct current, the first preset direct current, and the second preset direct current are all direct currents; the first alternating current and the second alternating current are all alternating currents.

[0029] It should be noted that the first battery cluster can be formed by connecting multiple battery packs in series, parallel, or series-parallel; the second battery cluster can be formed by connecting multiple battery packs in series, parallel, or series-parallel.

[0030] The first DC / DC converter can be: a power conversion device that converts a fixed or variable DC voltage into another fixed or variable DC voltage. For example, the first DC / DC converter can be: a DC input voltage of 1500V and a rated input power of 75KW.

[0031] The second DC / DC converter can be: a power conversion device that converts a fixed or variable DC voltage into another fixed or variable DC voltage. For example, the second DC / DC converter can be: a DC input voltage of 1500V and a rated input power of 75KW.

[0032] The first battery pack can be an integral unit assembled by multiple battery modules, used to store and provide electrical energy. Among them, the battery cell is the basic component unit of the battery module. Among them, the battery capacity of the first battery pack can be 100KWh, the rated voltage can be 640V, and the first battery pack can be a lithium iron phosphate battery.

[0033] The second battery pack can be an integral unit assembled by multiple battery modules, used to store and provide electrical energy. Among them, the battery cell is the basic component unit of the battery module. Preferably, the voltage that the second battery pack can access is 200 - 800V.

[0034] The first energy storage inverter can include: a DC / AC (Alternating Current to Direct Current) bidirectional converter, which can be used for AC-DC conversion. For example, the DC operating voltage range of the first energy storage inverter can be set to 700V to 1500V, and the rated power can be 150kW.

[0035] The second energy storage converter may include: a DC / AC bidirectional converter, which can be used for AC-DC conversion. For example, the DC operating voltage range of the second energy storage converter can be set to 700V to 1500V, and the rated power can be 150kW.

[0036] Preferably, in addition to the first energy storage converter, the second energy storage converter, the first DC / DC converter, the second DC / DC converter, the first battery pack, and the controller, the energy replenishment system may further include, but is not limited to, one or more of the following: An auxiliary power supply for storing the third direct current with a rated voltage of 24V, an auxiliary power supply for storing the third direct current of 12V, a liquid cooler powered by the third direct current, a load, a UPS (Uninterruptible Power Supply) uninterruptible power supply charged by the third direct current, and a transformer for converting the first alternating current into the third alternating current.

[0037] Among them, the third alternating current is used to supply power or charge the electrical equipment; the aforementioned transformer may include, but is not limited to: a power frequency isolation transformer.

[0038] The electrical equipment may include, but is not limited to, one or more of the following: a balancing device or a maintenance socket. Among them, the balancing device can be used to: balance the power of each battery cell in the first battery pack, balance the power of each battery cell in the second battery pack, balance the power of each battery cell in the first battery cluster, and / or balance the power of each battery cell in the first battery cluster. Preferably, the balancing device may have 114 channels for balancing 114 battery cells, and the output current range of the balancing device can be: 0.2A - 5A.

[0039] Preferably, the first DC / DC converter is further used to convert the first preset direct current output by the first battery cluster into a third preset direct current, where the third preset direct current is used to charge the first battery pack. Among them, the first preset direct current can be a kind of direct current, and the third preset direct current can be a kind of direct current. Among them, the voltages of the first preset direct current and the third preset direct current are different.

[0040] Preferably, after the first DC / DC converter converts the first direct current into the third direct current, the third direct current is used to supply power to the liquid cooler and the load respectively, charge the UPS uninterruptible power supply respectively through the third direct current, and / or charge the 12V auxiliary power supply.

[0041] Preferably, the second DC / DC converter is further configured to convert the first preset direct current output by the first battery cluster into a fourth preset direct current, where the fourth preset direct current is used to charge the second battery pack. The first preset direct current and the fourth preset direct current are both direct currents, and the voltages of the first preset direct current and the fourth preset direct current are different.

[0042] Preferably, the first battery pack is further configured to output a fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is further configured to convert the fifth preset direct current into a sixth preset direct current to charge the first battery cluster. The fifth preset direct current and the sixth preset direct current are both direct currents, and the voltages of the fifth preset direct current and the sixth preset direct current are different.

[0043] Preferably, the first battery pack is further configured to output a fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is further configured to convert the fifth preset direct current into a sixth preset direct current and input the sixth preset direct current into the first energy storage inverter. The first energy storage inverter is configured to convert the sixth preset direct current into a fourth alternating current, and the second energy storage inverter is configured to convert the fourth alternating current into a seventh preset direct current to charge the second battery cluster. The fourth alternating current is an alternating current, the seventh preset direct current is a direct current, and the voltages of the fifth preset direct current and the sixth preset direct current are different. It should be noted that after the sixth preset direct current is input into the first energy storage inverter, it can also be used to start the first energy storage inverter and for debugging the first energy storage inverter after startup, so as to prevent abnormal problems that may occur when the first energy storage inverter is connected to the mains / diesel power generation without debugging the first energy storage inverter.

[0044] Preferably, the first battery pack is further configured to output a fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is further configured to convert the fifth preset direct current into a sixth preset direct current, and the second DC / DC converter is further configured to convert the sixth preset direct current into an eighth preset direct current to charge the second battery pack. The eighth preset direct current is a direct current, and the voltages of the sixth preset direct current and the eighth preset direct current are different.

[0045] Preferably, the second DC / DC converter is further configured to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, where the tenth preset direct current is used to charge the first battery cluster. The ninth preset direct current and the tenth preset direct current are both direct currents, and the voltages of the ninth preset direct current and the tenth preset direct current are different.

[0046] Preferably, the second DC / DC converter is further configured to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, the first energy storage inverter is further configured to convert the tenth preset direct current into a fifth alternating current, and the second energy storage inverter is further configured to convert the fifth alternating current into an eleventh preset alternating current, where the eleventh preset alternating current is used to charge the second battery cluster. Both the fifth alternating current and the eleventh preset alternating current are alternating currents respectively.

[0047] Preferably, the second DC / DC converter is further configured to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, and the first DC / DC converter is further configured to convert the tenth preset direct current into a twelfth preset direct current, where the twelfth preset direct current is used to charge the first battery pack. The twelfth preset direct current is a direct current, and the voltages of the tenth preset direct current and the twelfth preset direct current are different.

[0048] Preferably, the second battery cluster is further configured to output a thirteenth preset direct current to the second energy storage inverter, the second energy storage inverter is configured to convert the thirteenth preset direct current into a sixth alternating current, and the first energy storage inverter is further configured to convert the sixth alternating current into a fourteenth preset direct current to charge the first battery cluster. It should be noted that after the thirteenth preset direct current is input to the second energy storage inverter, it can also be used to start the second energy storage inverter and to debug the second energy storage inverter after startup, so as to prevent abnormal problems that may occur when the second energy storage inverter is connected to the mains / diesel generator without being debugged.

[0049] The embodiment of the present application provides another energy replenishment system. The energy replenishment system includes: a first energy storage inverter, a second energy storage inverter, a first DC / DC converter, a second DC / DC converter, and a first battery pack controller. In addition, it includes but is not limited to any one or more of the following: A first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, an auxiliary power supply for storing the rated voltage of the third direct current of 24V, an auxiliary power supply for storing the 12V of the third direct current, a liquid cooler powered by the third direct current, a load, a UPS uninterruptible power supply charged by the third direct current, an input interface for inputting the first alternating current, and a transformer for converting the first alternating current into a third alternating current. Among them, The first switch can be set on the lines where the input interface for inputting the first alternating current is respectively coupled to the first energy storage inverter, the second energy storage inverter, and the transformer; The second switch can be set on the line where the first energy storage inverter is coupled to the first DC / DC converter; The third switch can be set on the line where the first energy storage inverter is coupled to the first battery cluster; The fourth switch can be arranged on the line where the first DC / DC converter is coupled to the auxiliary power supply; The fifth switch can be arranged on the line where the transformer is coupled to the electrical equipment; The sixth switch can be arranged on the line where the second energy storage inverter is coupled to the second battery; It should be noted that in this application, a schematic diagram of the system topology of the energy replenishment system provided with the above first switch, second switch, third switch, fourth switch, fifth switch, and sixth switch is shown as Figure 2 shown.

[0050] When the first switch, the third switch, and the sixth switch are all closed, the controller controls the first energy storage inverter to convert the first alternating current into the first direct current, controls the second energy storage inverter to convert the first alternating current into the second direct current, charges the first battery cluster with the first direct current in a constant power mode, and charges the second battery cluster with the second direct current in a constant power mode; When the first switch and the second switch are closed, the controller controls the first energy storage inverter to convert the first alternating current into the first direct current, and controls the first DC / DC converter to convert the first direct current into the third direct current to charge the first battery pack in a constant current mode.

[0051] When the first switch and the second switch are closed, the controller controls the first energy storage inverter to convert the first alternating current into the first direct current, and controls the second DC / DC converter to convert the first direct current into the fourth direct current to charge the second battery pack in a constant current mode.

[0052] When the third switch and the sixth switch are both closed, after the first battery cluster is used to output the first preset direct current to the first energy storage inverter, the controller controls the first energy storage inverter to convert the first preset direct current into the second alternating current, and controls the second energy storage inverter to convert the second alternating current into the second preset direct current to charge the second battery cluster in a constant power mode.

[0053] When the second switch is closed, the controller controls the first DC / DC converter to convert the first preset direct current output by the first battery cluster into the third preset direct current, and charges the first battery pack with the third preset direct current.

[0054] When the second switch is closed, the controller controls the second DC / DC converter to convert the first preset direct current output by the first battery cluster into the fourth preset direct current, and charges the second battery pack with the fourth preset direct current in a constant current mode.

[0055] When the second switch and the third switch are closed, the first battery pack is also used to output a fifth preset direct current to the first DC / DC converter, and the controller controls the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current to charge the first battery cluster.

[0056] When the second switch and the sixth switch are closed, the first battery pack is also used to output a fifth preset direct current to the first DC / DC converter. The controller controls the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current and output it in a constant voltage manner. The controller controls the first energy storage inverter to convert the sixth preset direct current into a fourth alternating current, and the controller controls the second energy storage inverter to convert the fourth alternating current into a seventh preset direct current to charge the second battery cluster in a constant power output manner.

[0057] When the second switch and the third switch are closed, the controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, and the tenth preset direct current charges the first battery cluster in a constant current manner.

[0058] When the second switch and the sixth switch are closed, the controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current and output it in a constant voltage manner. The controller controls the first energy storage inverter to convert the tenth preset direct current into a fifth alternating current, and the controller controls the second energy storage inverter to convert the fifth alternating current into an eleventh preset alternating current, and the eleventh preset alternating current charges the second battery cluster in a constant power manner.

[0059] When the fifth switch and the sixth switch are closed and the user device is an equalization device, the equalization device equalizes the power of each battery cell in the second battery cluster; When the fifth switch and the third switch are closed and the user device is an equalization device, the equalization device equalizes the power of each battery cell in the first battery cluster; When the fifth switch and the second switch are closed and the user device is an equalization device, the equalization device equalizes the power of each battery cell in the first battery pack, or the equalization device equalizes the power of each battery cell in the second battery pack.

[0060] Figure 3 Exemplarily shown is a flowchart of a charging method applied to a charging system, as Figure 3 shown, The charging system may include but is not limited to: A first energy storage inverter for converting a first alternating current into a first direct current, and a second energy storage inverter for converting a first alternating current into a second direct current; A first DC / DC converter for converting a first direct current into a third direct current, and a second DC / DC converter for converting the first direct current into a fourth direct current, wherein the voltage of the first direct current is different from the voltage of the third direct current, and the voltage of the first direct current is different from the voltage of the fourth direct current; A first battery pack for storing the third direct current; and A controller for sending control instructions for power conversion to the first energy storage converter, the second energy storage converter, the first DC / DC converter, or the second DC / DC converter respectively; Wherein, the first direct current is further used to charge a first battery cluster, the second direct current is used to charge a second battery cluster, and the fourth direct current is used to charge a second battery pack; after the first battery cluster is used to output a first preset direct current to the first energy storage converter, the first energy storage converter is further used to convert the first preset direct current into a second alternating current, and the second energy storage converter is further used to convert the second alternating current into a second preset direct current to charge the second battery cluster; wherein, the first direct current, the second direct current, the third direct current, the fourth direct current, the first preset direct current, and the second preset direct current are all direct currents respectively; the first alternating current and the second alternating current are all alternating currents respectively.

[0061] Specifically, the energy replenishment method may include but is not limited to the following steps: S301. Control the first energy storage converter to convert the first alternating current into a first direct current through the controller, and control the second energy storage converter to convert the first alternating current into a second direct current.

[0062] S302. Control the first DC / DC converter to convert the first direct current into a third direct current through the controller, and control the second DC / DC converter to convert the first direct current into a fourth direct current through the controller; when the first battery cluster is used to output a first preset direct current to the first energy storage converter, control the first energy storage converter to convert the first preset direct current into a second alternating current through the controller, and control the second energy storage converter to convert the second alternating current into a second preset direct current to charge the second battery cluster.

[0063] Preferably, in addition to the above steps S301 and S302, the energy replenishment method may further include but is not limited to: controlling the first DC / DC converter to convert the first preset direct current output by the first battery cluster into a third preset direct current through the controller, so as to charge the first battery pack with the third preset direct current.

[0064] Preferably, in addition to the above steps S301 and S302, the energy replenishment method may further include, but is not limited to: controlling, by a controller, a second DC / DC converter to convert a first preset direct current output by a first battery cluster into a fourth preset direct current, so as to charge a second battery pack with the fourth preset direct current.

[0065] Preferably, in addition to the above steps S301 and S302, the energy replenishment method may further include, but is not limited to: when a first DC / DC converter receives a fifth preset direct current output by a first battery pack, controlling, by a controller, the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current to charge the first battery cluster; or, when a first DC / DC converter receives a fifth preset direct current output by a first battery pack, controlling, by a controller, the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current, controlling, by a controller, a first energy storage inverter to convert the sixth preset direct current into a fourth alternating current, and controlling, by a controller, a second energy storage inverter to convert the fourth alternating current into a seventh preset direct current to charge a second battery cluster; or, when a first DC / DC converter receives a fifth preset direct current output by a first battery pack, controlling, by a controller, the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current, and controlling, by a controller, a second DC / DC converter to convert the sixth preset direct current into an eighth preset direct current to charge a second battery pack.

[0066] Preferably, in addition to the above steps S301 and S302, the energy replenishment method may further include, but is not limited to: controlling, by a controller, a second DC / DC converter to convert a ninth preset direct current output by a second battery pack into a tenth preset direct current, and charging the first battery cluster with the tenth preset direct current; or, controlling, by a controller, a second DC / DC converter to convert a ninth preset direct current output by a second battery pack into a tenth preset direct current, controlling, by a controller, a first energy storage inverter to convert the tenth preset direct current into a fifth alternating current, and controlling, by a controller, a second energy storage inverter to convert the fifth alternating current into an eleventh preset alternating current, so as to charge a second battery cluster with the eleventh preset alternating current; or, controlling, by a controller, a second DC / DC converter to convert a ninth preset direct current output by a second battery pack into a tenth preset direct current, and controlling, by a controller, a first DC / DC converter to convert the tenth preset direct current into a twelfth preset direct current, so as to charge a first battery pack with the twelfth preset direct current.

[0067] It should be noted that the energy replenishment system may further include any one or more of the following: The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, an auxiliary power supply for storing the rated voltage of 24V of the third direct current, an auxiliary power supply for storing 12V of the third direct current, a liquid cooler powered by the third direct current, a load, a UPS uninterruptible power supply charged by the third direct current, an input interface for inputting the first alternating current, and a transformer for converting the first alternating current into the third alternating current; wherein, The third alternating current is used to supply power or charge electrical equipment; The first switch is disposed on the lines where the input interface for inputting the first alternating current is respectively coupled to the first energy storage converter, the second energy storage converter, and the transformer; The second switch is disposed on the line where the first energy storage converter is coupled to the first DC / DC converter; The third switch is disposed on the line where the first energy storage converter is coupled to the first battery cluster; The fourth switch is disposed on the line where the first DC / DC converter is coupled to the auxiliary power supply; The fifth switch is disposed on the line where the transformer is coupled to the electrical equipment; The sixth switch is disposed on the line where the second energy storage converter is coupled to the second battery; It should be noted that the energy replenishment method may specifically include but is not limited to: When the first switch, the third switch, and the sixth switch are all closed, the controller controls the first energy storage converter to convert the first alternating current into the first direct current, the controller controls the second energy storage converter to convert the first alternating current into the second direct current, the first direct current is used to charge the first battery cluster in a constant power manner, and the second direct current is used to charge the second battery cluster in a constant power manner; The energy replenishment method may specifically further include but is not limited to: When the first switch and the second switch are closed, the controller controls the first energy storage converter to convert the first alternating current into the first direct current, and controls the first DC / DC converter to convert the first direct current into the third direct current to charge the first battery pack in a constant current manner.

[0068] The energy replenishment method may specifically further include but is not limited to: When the first switch and the second switch are closed, the controller controls the first energy storage converter to convert the first alternating current into the first direct current, and controls the second DC / DC converter to convert the first direct current into the fourth direct current to charge the second battery pack in a constant current manner.

[0069] The energy replenishment method may specifically further include but is not limited to: When both the third switch and the sixth switch are closed, the first battery cluster is used to output a first preset direct current to the first energy storage inverter. Then, the controller controls the first energy storage inverter to convert the first preset direct current into a second alternating current, and the controller controls the second energy storage inverter to convert the second alternating current into a second preset direct current to charge the second battery cluster in a constant power manner.

[0070] The energy replenishment method may specifically further include, but is not limited to: When the second switch is closed, the controller controls the first DC / DC converter to convert the first preset direct current output by the first battery cluster into a third preset direct current, and charges the first battery pack with the third preset direct current.

[0071] The energy replenishment method may specifically further include, but is not limited to: When the second switch is closed, the controller controls the second DC / DC converter to convert the first preset direct current output by the first battery cluster into a fourth preset direct current, and charges the second battery pack with the fourth preset direct current in a constant current manner.

[0072] The energy replenishment method may specifically further include, but is not limited to: When the second switch and the third switch are closed, the first battery pack is also used to output a fifth preset direct current to the first DC / DC converter. The controller controls the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current to charge the first battery cluster.

[0073] The energy replenishment method may specifically further include, but is not limited to: When the second switch and the sixth switch are closed, the first battery pack is also used to output a fifth preset direct current to the first DC / DC converter. The controller controls the first DC / DC converter to convert the fifth preset direct current into a sixth preset direct current and output it in a constant voltage manner. The controller controls the first energy storage inverter to convert the sixth preset direct current into a fourth alternating current, and the controller controls the second energy storage inverter to convert the fourth alternating current into a seventh preset direct current to charge the second battery cluster in a constant power output manner.

[0074] The energy replenishment method may specifically further include, but is not limited to: When the second switch and the third switch are closed, the controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, and charges the first battery cluster with the tenth preset direct current in a constant current manner.

[0075] The energy replenishment method may specifically further include, but is not limited to: When the second switch and the sixth switch are closed, the controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into the tenth preset direct current and output it in a constant voltage manner. The controller controls the first energy storage inverter to convert the tenth preset direct current into the fifth alternating current, and controls the second energy storage inverter to convert the fifth alternating current into the eleventh preset alternating current, and charges the second battery cluster with the eleventh preset alternating current in a constant power manner.

[0076] The energy replenishment method may specifically further include but is not limited to: When the fifth switch and the sixth switch are closed and the user device is an equalization device, the equalization device equalizes the power of each battery cell in the second battery cluster.

[0077] The energy replenishment method may specifically further include but is not limited to: When the fifth switch and the third switch are closed and the user device is an equalization device, the equalization device equalizes the power of each battery cell in the first battery cluster.

[0078] The energy replenishment method may specifically further include but is not limited to: When the fifth switch and the second switch are closed and the user device is an equalization device, the equalization device equalizes the power of each battery cell in the first battery pack, or equalizes the power of each battery cell in the second battery pack.

[0079] Regarding Figure 3 For the specific implementation manner of using the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch for charging and discharging between each battery pack and battery cluster in the embodiment, reference can also be made in detail to Figure 2 the embodiment.

[0080] It should be noted that Figure 3 For the definitions or descriptions not elaborated in detail in the embodiment, reference can be made to Figure 1 - Figure 2 the described embodiment, which will not be repeated here.

[0081] It should be noted that Figure 1 - Figure 3 The described embodiments can be combined with each other.

[0082] Figure 1 - Figure 3 This is only used to illustrate the embodiments of the present application and should not limit the protection scope of the present application.

[0083] Those of ordinary skill in the art will appreciate that the components and algorithm steps of the examples described in conjunction with the embodiments disclosed in this application can be implemented using electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of the examples have been generally described according to their functions in the above description. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0084] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the components and systems described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0085] In several embodiments provided in this application, it should be understood that the disclosed components, systems, and methods can be implemented in other ways. For example, the composition and steps of the examples have been described. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0086] The embodiments of the systems and components described above are merely illustrative. Additionally, the couplings or direct couplings between the components shown or discussed may be indirect couplings or communication connections through some interfaces, components, systems, or units, or may be electrical, mechanical, or other forms of connection.

[0087] Based on such understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0088] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An energy replenishment system, characterized in that: include: A first energy storage converter for converting the first alternating current into a first direct current, and a second energy storage converter for converting the first alternating current into a second direct current; a first DC / DC converter for converting the first direct current into a third direct current, and a second DC / DC converter for converting the first direct current into a fourth direct current, wherein the voltage of the first direct current is different from the voltage of the third direct current, and the voltage of the first direct current is different from the voltage of the fourth direct current; a first battery pack for storing a third direct current; and A controller, the controller being used to send control instructions for performing electric energy conversion to the first energy storage converter, the second energy storage converter, the first DC / DC converter or the second DC / DC converter respectively; The first direct current is also used to charge the first battery cluster, the second direct current is used to charge the second battery cluster, and the fourth direct current is used to charge the second battery pack; after the first battery cluster is used to output the first preset direct current to the first energy storage converter, the first energy storage converter is also used to convert the first preset direct current into the second alternating current, and the second energy storage converter is also used to convert the second alternating current into the second preset direct current to charge the second battery cluster; Among them, the first direct current, the second direct current, the third direct current, the fourth direct current, the first preset direct current, and the second preset direct current are all direct currents; the first alternating current and the second alternating current are both alternating currents.

2. The energy replenishment system according to claim 1, characterized in that: The energy replenishment system also includes any one or more of the following: an auxiliary power supply for storing a third direct current, a transformer for converting the first alternating current into a third alternating current, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch; wherein, The third alternating current is used to power or charge electrical equipment; The first switch is arranged on the line of the input interface for inputting the first alternating current and is respectively coupled to the first energy storage converter, the second energy storage converter and the transformer; The second switch is arranged on a line where the first energy storage converter is coupled to the first DC / DC converter; The third switch is arranged on a line coupling the first energy storage converter and the first battery cluster; The fourth switch is arranged on a line where the first DC / DC converter is coupled to the auxiliary power supply; The fifth switch is arranged on the line for coupling connection between the transformer and the electric equipment; The sixth switch is arranged on a line that couples the second energy storage converter to the second battery.

3. The energy replenishment system according to claim 2, characterized in that: The first DC / DC converter is further used to convert the first preset direct current output by the first battery cluster into a third preset direct current, wherein the third preset direct current is used to charge the first battery pack.

4. The energy replenishment system according to claim 3, characterized in that: The second DC / DC converter is further used to convert the first preset direct current output by the first battery cluster into a fourth preset direct current, wherein the fourth preset direct current is used to charge the second battery pack.

5. The energy replenishment system according to claim 2, characterized in that: The first battery pack is further used to output a fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is further used to convert the fifth preset direct current into a sixth preset direct current to charge the first battery cluster.

6. The energy replenishment system according to claim 2, characterized in that: The first battery pack is also used to output the fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is also used to convert the fifth preset direct current into a sixth preset direct current. The first energy storage inverter is used to convert the sixth preset direct current into a fourth alternating current, and the second energy storage inverter is used to convert the fourth alternating current into a seventh preset direct current to charge the second battery cluster.

7. The energy replenishment system according to claim 2, characterized in that: The first battery pack is also used to output the fifth preset direct current to the first DC / DC converter, and the first DC / DC converter is also used to convert the fifth preset direct current into a sixth preset direct current. The second DC / DC converter is also used to convert the sixth preset direct current into an eighth preset direct current to charge the second battery pack.

8. The energy replenishment system according to claim 2, characterized in that: The second DC / DC converter is further used to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, wherein the tenth preset direct current is used to charge the first battery cluster.

9. The energy replenishment system according to claim 2, characterized in that: The second DC / DC converter is also used to convert the ninth preset direct current output by the second battery pack into a tenth preset direct current, the first energy storage inverter is also used to convert the tenth preset direct current into a fifth alternating current, and the second energy storage inverter is also used to convert the fifth alternating current into an eleventh preset alternating current, wherein the eleventh preset alternating current is used to charge the second battery cluster.

10. The energy replenishment system according to claim 2, characterized in that: The second DC / DC converter is also used to convert the ninth preset DC power output by the second battery pack into a tenth preset DC power, and the first DC / DC converter is also used to convert the tenth preset DC power into a twelfth preset DC power, wherein the twelfth preset DC power is used to charge the first battery pack.

11. An energy replenishment method applied to the energy replenishment system according to any one of claims 1 to 10, characterized in that: include: Control the first energy storage converter to convert the first alternating current into the first direct current through the controller, and control the second energy storage converter to convert the first alternating current into the second direct current; Controlling the first DC / DC converter through the controller to convert the first direct current into the third direct current, and controlling the second DC / DC converter through the controller to convert the first direct current into the fourth direct current; After the first battery cluster is used to output the first preset direct current to the first energy storage inverter, the controller controls the first energy storage inverter to convert the first preset direct current into the second alternating current, and the controller controls the second energy storage inverter to convert the second alternating current into the second preset direct current to charge the second battery cluster.

12. The energy replenishment method according to claim 11, characterized in that: Also includes: The controller controls the first DC / DC converter to convert the first preset direct current output by the first battery cluster into a third preset direct current, so as to charge the first battery pack through the third preset direct current.

13. The energy replenishment method according to claim 11, characterized in that: Also includes: The controller controls the second DC / DC converter to convert the first preset direct current output by the first battery cluster into a fourth preset direct current, so as to charge the second battery pack through the fourth preset direct current.

14. The energy replenishment method according to claim 11, characterized in that: Also includes: When the first DC / DC converter receives the fifth preset DC power output by the first battery pack, the controller controls the first DC / DC converter to convert the fifth preset DC power into a sixth preset DC power to charge the first battery cluster; or, When the first DC / DC converter receives the fifth preset DC power output by the first battery pack, the controller controls the first DC / DC converter to convert the fifth preset DC power into the sixth preset DC power, the controller controls the first energy storage converter to convert the sixth preset DC power into the fourth AC power, and the controller controls the second energy storage converter to convert the fourth AC power into the seventh preset DC power to charge the second battery cluster; or, When the first DC / DC converter receives the fifth preset DC power output by the first battery pack, the controller controls the first DC / DC converter to convert the fifth preset DC power into the sixth preset DC power, and the controller controls the second DC / DC converter to convert the sixth preset DC power into the eighth preset DC power to charge the second battery pack.

15. The energy replenishment method according to claim 11, characterized in that: Also includes: Controlling the second DC / DC converter by the controller to convert the ninth preset direct current output by the second battery pack into the tenth preset direct current, and charging the first battery cluster by the tenth preset direct current; or, The controller controls the second DC / DC converter to convert the ninth preset direct current output by the second battery pack into the tenth preset direct current, the controller controls the first energy storage converter to convert the tenth preset direct current into the fifth alternating current, and the controller controls the second energy storage converter to convert the fifth alternating current into the eleventh preset alternating current, so as to charge the second battery cluster through the eleventh preset alternating current; or, The controller controls the second DC / DC converter to convert the ninth preset DC power output by the second battery pack into the tenth preset DC power, and the controller controls the first DC / DC converter to convert the tenth preset DC power into the twelfth preset DC power, so as to charge the first battery pack with the twelfth preset DC power.

16. An energy replenishment method applied to the energy replenishment system according to claim 2, characterized in that: include: When the first switch, the third switch, and the sixth switch are all closed, the controller controls the first energy storage inverter to convert the first alternating current into the first direct current, and the controller controls the second energy storage inverter to convert the first alternating current into the second direct current. The first direct current is used to charge the first battery cluster, and the second direct current is used to charge the second battery cluster.

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