Energy storage charging and discharging equipment and energy storage charging and discharging system

Abstract

The utility model relates to an energy storage charging and discharging device and an energy storage charging and discharging system, in the energy storage charging and discharging device, a first direct current converter is connected with a bidirectional energy storage converter, a direct current junction station is connected with a first energy storage device to be tested and the first direct current converter, and a second direct current converter is connected with a second energy storage device to be tested and the direct current junction station; the controller is connected with the bidirectional energy storage converter, the first DC converter, the DC junction station and the second DC converter, and is used for controlling the charging test and the discharging test of the first energy storage device to be tested or the second energy storage device to be tested and the charging test and the discharging test between the first energy storage device to be tested and the second energy storage device to be tested. The at least one direct-current wall-mounted cabinet is installed on the outer wall of the energy storage charging and discharging equipment, and the second direct-current converter is connected with the first energy storage device to be tested through the at least one direct-current wall-mounted cabinet. According to the utility model, the efficiency of charging test and discharging test of the to-be-tested energy storage device can be improved, and the device is safer and more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage testing, in particular to an energy storage charging and discharging device and an energy storage charging and discharging system. Background Art

[0002] Large energy storage containers have emerged to store electricity for emergency use during periods of abundant power and to ensure smooth grid operation during periods of power shortage. These containers require charging and discharging testing at an integrated factory. Due to the high volume of testing required and the large size of the integrated factory, workers must use forklifts or cranes to transport the containers to designated locations for charging and discharging. This is not only time-consuming and labor-intensive, resulting in low testing efficiency, but also requires multiple safety precautions, further increasing testing costs. Utility Model Content

[0003] In view of this, the utility model proposes an energy storage charging and discharging device and an energy storage charging and discharging system, which can be deployed in an integrated manner, reduce the back-and-forth movement of containers, and can realize mutual charging and discharging between different energy storage devices to be tested without the need for mains power, thereby improving the efficiency of charging and discharging tests on the energy storage devices to be tested, and making the testing process safer and more convenient.

[0004] According to one aspect of the present invention, an energy storage charging and discharging device is provided, which includes a bidirectional energy storage converter, a first DC converter, a DC bus, a second DC converter, and a controller, wherein the bidirectional energy storage converter is electrically connected to a detachable AC wall cabinet, the first DC converter is electrically connected to the bidirectional energy storage converter, the DC bus is electrically connected to a first energy storage device to be tested and the first DC converter, the second DC converter is electrically connected to a second energy storage device to be tested and the DC bus, and the controller is respectively The device is electrically connected to the bidirectional energy storage converter, the first DC converter, the DC bus, and the second DC converter, and is used to control the charging test and discharging test of the first energy storage device to be tested or the second energy storage device to be tested, as well as the charging test and discharging test between the first energy storage device to be tested and the second energy storage device to be tested; the energy storage charging and discharging equipment also includes at least one DC wall cabinet installed on the outer wall of the energy storage charging and discharging equipment, and the second DC converter is electrically connected to the first energy storage device to be tested through at least one DC wall cabinet.

[0005] According to another aspect of the present invention, an energy storage charging and discharging system is provided, which includes the energy storage charging and discharging equipment and at least two energy storage devices to be tested.

[0006] By integrating a bidirectional energy storage converter, a first DC converter, a DC bus, and a second DC converter into an energy storage charging and discharging device, and providing a controller electrically connected to the bidirectional energy storage converter, the first DC converter, the DC bus, and the second DC converter, respectively, the charging test and the discharging test of the first energy storage device to be tested or the second energy storage device to be tested, as well as the charging test and the discharging test between the first energy storage device to be tested and the second energy storage device to be tested are controlled, and at least one DC hanging cabinet is installed on the outer wall of the energy storage charging and discharging device. According to various aspects of the present invention, an integrated deployment can be achieved, the back-and-forth movement of the container is reduced, and mutual charging and discharging between different energy storage devices to be tested can be achieved without the need for mains power, thereby improving the efficiency of the charging test and the discharging test of the energy storage device to be tested, and the testing process is safer and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0008] Figure 1 A block diagram of an energy storage charging and discharging device according to an embodiment of the present invention is shown.

[0009] Figure 2 A schematic diagram showing an energy storage charging and discharging device according to an embodiment of the present invention.

[0010] Figure 3 A schematic diagram showing a multi-stage structure of a DC converter according to an embodiment of the present invention.

[0011] Figure 4 A schematic diagram of a combiner cabinet according to an embodiment of the present invention is shown.

[0012] Figure 5 A schematic diagram showing a mains wall-mounted cabinet and a DC wall-mounted cabinet according to an embodiment of the present utility model is shown.

[0013] Figure 6 A schematic diagram showing the energy storage charging and discharging device according to an embodiment of the present utility model operating in a first operating mode.

[0014] Figure 7 A schematic diagram showing the energy storage charging and discharging device according to an embodiment of the present invention operating in the second operating mode.

[0015] Figure 8 A schematic diagram showing the energy storage charging and discharging device according to an embodiment of the present utility model operating in the third operating mode. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0018] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0019] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will be aware of the application of other processes and / or the use of other materials. In some instances, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0020] Figure 1 The block diagram of the energy storage charging and discharging device of the embodiment of the present utility model is shown. Figure 1 As shown, the energy storage charging and discharging device 100 of the present invention includes a bidirectional energy storage converter 101 (Power Conversion System, PCS), a first DC converter 102 , a DC bus 103 , a second DC converter 104 and a controller 108 . In which, the bidirectional energy storage converter 101 is electrically connected to a detachable AC wall cabinet 200, the first DC converter 102 is electrically connected to the bidirectional energy storage converter 101, the DC bus 103 is electrically connected to the first energy storage device to be tested 301 and the first DC converter 102, the second DC converter 104 is electrically connected to the second energy storage device to be tested 302 and the DC bus 103, and the controller 108 is electrically connected to the bidirectional energy storage converter 101, the first DC converter 102, the DC bus 103 and the second DC converter 104 respectively, and is used to control the charging test and discharging test of the first energy storage device to be tested 301 or the second energy storage device to be tested 302, as well as the charging test and discharging test between the first energy storage device to be tested 301 and the second energy storage device to be tested 302.

[0021] In one embodiment, the bidirectional energy storage converter 101 is installed in a bidirectional energy storage converter cabinet. The bidirectional energy storage converter 101 is also called a bidirectional energy storage inverter, which is used to realize energy conversion and bidirectional flow between the energy storage cabinet to be tested and the power grid.

[0022] In grid-connected mode, the bidirectional energy storage converter 101 can convert DC power into AC power, or vice versa, to meet the grid's charging and discharging needs for the energy storage cabinet under test. When the grid requires the energy storage cabinet under test to discharge, the bidirectional energy storage converter 101 converts the DC power in the cabinet under test into AC power and integrates it into the grid. When the grid needs to charge the energy storage system, the bidirectional energy storage converter 101 converts the AC power in the grid into DC power and stores it in the energy storage cabinet under test.

[0023] Figure 2 A schematic diagram showing an energy storage charging and discharging device according to an embodiment of the present invention.

[0024] like Figure 2 As shown, the bidirectional energy storage converter 101 has an AC input terminal and a first DC output terminal, the AC input terminal is electrically connected to the mains wall cabinet 200, and the first DC output terminal is used to transmit multiple pairs of first DC signals. The mains wall cabinet 200 can be installed on the outer wall of the energy storage charging and discharging device 100, and adopts a detachable crimping terminal, which is convenient and flexible. Exemplarily, the mains wall cabinet 200 is used to access the mains from the power grid, and the bidirectional energy storage converter 101 can convert the mains received from the power grid into multiple pairs of first DC signals output by the first DC output terminal. The bidirectional energy storage converter 101 is used to convert the mains received from the power grid by the mains wall cabinet 200 into multiple pairs of first DC signals or convert multiple pairs of first DC signals into mains and incorporate them into the power grid.

[0025] The AC input terminals include five ports: L1, L2, L3, N, and PE. L1, L2, and L3 are live wires for three-phase AC power, N is the neutral wire, and PE is the ground wire. The first DC output terminals include three pairs of first DC output ports, each pair of which is configured to output a pair of first DC signals, such as DC+ and DC- signals. Optionally, the mains power is an AC signal with an amplitude of 380V, and the rated power of the bidirectional energy storage converter 101 is 250kW.

[0026] In one embodiment, the first DC converter 102 is installed in the first DC conversion cabinet, and the first DC converter 102 is used to perform DC / DC (i.e., DC / DC) conversion on multiple pairs of first DC signals received from the first DC output terminal of the bidirectional energy storage converter cabinet to obtain at least two pairs of second DC signals.

[0027] The first DC converter 102 has a first DC input terminal and a second DC output terminal. The first DC input terminal is electrically connected to the first DC output terminal of the bidirectional energy storage converter 101. The first DC output terminal is used to transmit at least two pairs of second DC signals. The second DC output terminal is electrically connected to the DC bus 103. The number of pairs of the first DC signal and the number of pairs of the second DC signal can be different. For example, the first DC signal has three pairs and the second DC signal has two pairs. Optionally, the rated power of the first DC converter 102 is 375 kW.

[0028] In one embodiment, a DC combiner 103 is installed in the DC combiner cabinet, and the DC combiner 103 is used to combine at least two pairs of the second DC signals into multiple pairs of third DC signals. The number of pairs of the second DC signals and the number of pairs of the third DC signals can be different.

[0029] The DC combiner 103 has a second DC input terminal and a third DC output terminal. The second DC input terminal is electrically connected to the second DC output terminal of the first DC converter 102, and the third DC output terminal is electrically connected to the first energy storage device under test 301, thereby outputting multiple pairs of third DC signals to the first energy storage device under test 301. The first energy storage device under test 301 is installed in the first energy storage cabinet under test and has at least two DC input ports to facilitate the input of multiple pairs of third DC signals.

[0030] In one embodiment, the second DC converter 104 is installed in a second DC conversion cabinet, and the second DC converter 104 is configured to perform DC conversion on multiple pairs of the third DC signals to obtain multiple pairs of fourth DC signals.

[0031] The second DC converter 104 has a third DC input terminal and a fourth DC output terminal. The third DC input terminal is electrically connected to the second DC input terminal of the DC combiner 103, and the fourth DC output terminal is electrically connected to the second energy storage device to be tested 302, so as to output at least one pair of fourth DC signals to the second energy storage device to be tested 302.

[0032] In one embodiment, the energy storage charging and discharging device 100 further includes a third DC converter 105 , which is installed in a third DC conversion cabinet. The third DC converter 105 is configured to perform DC conversion on multiple pairs of the third DC signals to obtain multiple pairs of fifth DC signals.

[0033] The third DC converter 105 has a fourth DC input terminal and a fifth DC output terminal. The fourth DC input terminal is electrically connected to the second DC input terminal of the DC combiner 103, and the fifth DC output terminal is electrically connected to the second energy storage device to be tested 302, so as to output at least two pairs of fifth DC signals to the second energy storage device to be tested 302.

[0034] In one embodiment, the fourth DC output terminal includes multiple pairs of fourth DC output ports, and the fifth DC output terminal includes multiple pairs of fifth DC output ports. A pair of the fourth DC output ports in the multiple pairs of fourth DC output ports is electrically connected to a pair of the fifth DC output ports in the multiple pairs of fifth DC output ports, and other pairs of the fourth DC output ports in the multiple pairs of fourth DC output ports and other pairs of the fifth DC output ports in the multiple pairs of fifth DC output ports are electrically connected to a second energy storage cabinet to be tested, and the second energy storage device to be tested 302 is installed in the second energy storage cabinet to be tested. The second energy storage device to be tested 302 has at least two DC input ports to facilitate the input of fourth DC signals from other pairs of the fourth DC output ports in the multiple pairs of fourth DC output ports and fifth DC signals from other pairs of the fifth DC output ports in the multiple pairs of fifth DC output ports.

[0035] It is worth noting that the ports or signals of the present invention can be used not only for input but also for output. For example, the AC input terminal can be used for both AC signal input and AC signal output. Whether the port or signal is input or output depends on the specific test scenario of charging or discharging.

[0036] In one embodiment, the energy storage charging and discharging device 100 further includes at least two DC wall-mounted cabinets, which are installed on the outer wall of the energy storage charging and discharging device 100, for example Figure 2 The first DC wall cabinet 107 and the second DC wall cabinet 106 are provided. The second DC converter 104 is electrically connected to the first energy storage device to be tested 301 through at least one of the DC wall cabinets, and the third DC converter 105 is electrically connected to the second energy storage device to be tested 302 through at least another of the DC wall cabinets.

[0037] The DC wall-mounted cabinet is equipped with three pairs of DC ports for connecting to at least two energy storage devices under test. By mounting at least two DC wall-mounted cabinets on the outer wall of the energy storage charging and discharging apparatus 100, flexible switching between charging and discharging tests between different energy storage devices under test is possible, while the layered isolation design further enhances the safety of test harness operation.

[0038] It should be noted that the first energy storage device to be tested 301 and the second energy storage device to be tested 302 may be battery packs. In practical applications, the first energy storage device to be tested 301 and the second energy storage device to be tested 302 may also be battery modules or cells. In some embodiments, the present invention may include multiple energy storage devices to be tested. It is understood that the present invention does not limit the number of energy storage devices to be tested.

[0039] Figure 3 A schematic diagram showing a multi-stage structure of a DC converter according to an embodiment of the present invention.

[0040] In one embodiment, if Figure 3 As shown, the first DC converter 102, the second DC converter 104 and the third DC converter 105 are all multi-stage structures, wherein the first DC converter 102 is provided with at least three-stage DC / DC conversion units, and the second DC converter 104 and the third DC converter 105 are respectively provided with at least eight-stage DC / DC conversion units.

[0041] In the first DC converter 102, three-stage DC / DC conversion units can be arranged in parallel, and a switch can be connected to each of the two ends of the three parallel-arranged DC / DC conversion units to select which DC / DC conversion units can be put into operation. Similarly, in the second DC converter 104, eight-stage DC / DC conversion units can be arranged in parallel, and a switch can be connected to each of the two ends of the eight parallel-arranged DC / DC conversion units to select which DC / DC conversion units can be put into operation.

[0042] from Figure 3 It can be seen that the second DC converter 104 can be electrically connected to the first DC converter 102 and the DC wall cabinet, and the third DC converter 105 can be electrically connected to the first DC converter 102 and the DC wall cabinet. Therefore, the second DC converter 104 and the first DC converter 102 are arranged in series, the third DC converter 105 and the first DC converter 102 are arranged in series, and the second DC converter 104 and the third DC converter 105 are arranged in parallel. By setting the first DC converter 102, the second DC converter 104, and the third DC converter 105 to all have a multi-stage structure, the power of the first DC converter 102, the second DC converter 104, and the third DC converter 105 can be more accurately controlled, thereby improving the accuracy of the charging test and the discharging test.

[0043] Figure 4 A schematic diagram of a combiner cabinet according to an embodiment of the present invention is shown.

[0044] like Figure 4As shown, the DC busbar includes a contactor and a shunt release electrically connected to the contactor. The contactor is provided with a plurality of normally open contacts and a plurality of normally closed contacts. Figure 4 There are four normally open contacts and four normally closed contacts. Among them, at least two normally open contacts are connected to the bidirectional energy storage converter 101, and at least two normally open contacts are connected to the positive and negative electrodes of the first energy storage device to be tested 301. The shunt release can be used to remotely operate the tripping.

[0045] Figure 5 A schematic diagram showing a mains wall-mounted cabinet and a DC wall-mounted cabinet according to an embodiment of the present utility model is shown.

[0046] like Figure 5 As shown, the mains wall cabinet 200 includes five copper busbars: L1, L2, L3, N, and PE. Each busbar has a current carrying capacity of 1500A. External cables connected to the mains wall cabinet 200 can be secured to the L1, L2, and L3 busbars using copper lugs and matching bolts, making removal quick and easy. To ensure secure wiring, the exposed portions of the busbars are protected and isolated with transparent insulating panels.

[0047] Similarly, the DC wall-mounted cabinet includes three copper busbars: DC+, DC-, and PE. Each busbar has a current carrying capacity of 1500A. External cables between the DC wall-mounted cabinet and the energy storage device under test can be secured to the DC+ and DC- busbars using copper lugs and matching bolts, making removal quick and easy. To ensure secure wiring, the exposed portions of the busbars are protected and isolated with transparent insulating panels.

[0048] See also Figure 2 The energy storage charging and discharging device 100 may further include a controller 108, which may be a touch-sensitive energy management system (EMS) controller 108 installed on the energy storage charging and discharging device 100. The bidirectional energy storage converter cabinet, the first DC converter cabinet, the DC combiner cabinet, the second DC converter cabinet, and the third DC converter cabinet may all be provided with network ports, and multiple network ports may be aggregated into a switch 109 and then connected to the controller 108. The controller 108 is electrically connected to the network ports of the bidirectional energy storage converter cabinet, the first DC converter cabinet, the DC combiner cabinet, the second DC converter cabinet, and the third DC converter cabinet, respectively, so as to control the charging and discharging process of the energy storage charging and discharging device 100 through an internal network.

[0049] In one embodiment, the energy storage charging and discharging device 100 can be manufactured using a 20-foot standard container. Within the energy storage charging and discharging device 100, the bidirectional energy storage converter cabinet, first DC converter cabinet, DC combiner cabinet, second DC converter cabinet, and third DC converter cabinet can be integrated and arranged in a row on a prefabricated channel steel foundation within the standard container, thereby ensuring more secure and stable mounting of the cabinets.

[0050] In one embodiment, the controller 108 can operate in different operating modes. Optionally, the controller 108 can operate in a first operating mode, a second operating mode, or a third operating mode.

[0051] Figure 6 A schematic diagram showing the energy storage charging and discharging device according to an embodiment of the present utility model operating in a first operating mode.

[0052] like Figure 6 As shown, in the first working mode, the energy storage charging and discharging device 100 uses the mains power from the power grid to charge or discharge the first energy storage device to be tested 301. The first energy storage device to be tested 301 can be a small energy storage device to be tested. Taking charging as an example, the mains power wall cabinet 200 is connected to the 380V mains power from the power grid. After conversion by the bidirectional energy storage converter 101, a first DC signal with an amplitude of 690V is obtained. Then, after the DC / DC conversion of the first DC converter 102 and the confluence of the DC confluence 103, a third DC signal with an amplitude of 690V is transmitted to the first energy storage device to be tested 301 to charge the first energy storage device to be tested 301. The discharge process is opposite to the charging process of the first energy storage device to be tested 301.

[0053] Figure 7 A schematic diagram showing the energy storage charging and discharging device according to an embodiment of the present invention operating in the second operating mode.

[0054] like Figure 7As shown, in the second working mode, the energy storage charging and discharging device 100 uses the mains power from the power grid to charge or discharge the first energy storage device to be tested 301. The second energy storage device to be tested 302 can be a large energy storage device to be tested. Taking charging as an example, the mains wall cabinet 200 is connected to the 380V mains power from the power grid. After conversion by the bidirectional energy storage converter 101, a first DC signal with an amplitude of 690V is obtained, which is then converted by the DC / DC conversion of the first DC converter 102 and the confluence of the DC concentrator 103. The output DC voltage is precisely adjusted by the two converters of the second DC converter 104 and the third DC converter 105 at the subsequent stage. Finally, the precisely adjusted DC signal is transmitted to the second energy storage device to be tested 302 to charge the second energy storage device to be tested 302. The discharge process is opposite to the charging process of the second energy storage device to be tested 302.

[0055] Figure 8 A schematic diagram showing the energy storage charging and discharging device according to an embodiment of the present utility model operating in the third operating mode.

[0056] like Figure 8 As shown, in the third working mode, the energy storage charging and discharging device 100, the first energy storage device to be tested 301, and the second energy storage device to be tested 302 form a complete and independent charging and discharging test system, which can realize the charging and discharging between different energy storage devices to be tested without the need for mains power. Taking charging as an example, when the voltage of the second energy storage device to be tested 302 is lower than the voltage of the first energy storage device to be tested 301, the second energy storage device to be tested 302 can be charged through the DC bus cabinet, the second DC converter 104, and the third DC converter 105. In actual application, charging and discharging tests can be performed between multiple energy storage devices to be tested with a voltage of 600-1500V and a power of 100kW-5MW.

[0057] In one embodiment, after the energy storage charging and discharging device 100 is started, the controller 108 can be used to set power parameters and scheduling commands, and then the energy storage device to be tested is charged and discharged. Optionally, multiple energy storage devices to be tested are charged at the same time according to the capacity of the energy storage device to be tested. When charging multiple energy storage devices to be tested, the first DC conversion cabinet and the second DC conversion cabinet can be started and stopped according to actual conditions. For example, select the scheduling command and set the DC active power adjustment (0-240kW). If the first DC conversion cabinet is in the off state, the power is sent down to charge the second energy storage device to be tested 302; if the first DC conversion cabinet is started and the same power is set, the first energy storage device to be tested 301 can be charged.

[0058] In addition, the present invention also provides an energy storage charging and discharging system, which includes the energy storage charging and discharging device and at least two energy storage devices to be tested. It is understood that the present invention does not limit other parts of the energy storage charging and discharging system.

[0059] In summary, by integrating a bidirectional energy storage converter, a first DC converter, a DC bus and a second DC converter into an energy storage charging and discharging device, and providing a controller electrically connected to the bidirectional energy storage converter, the first DC converter, the DC bus and the second DC converter respectively, thereby controlling the charging test and the discharging test of the first energy storage device to be tested or the second energy storage device to be tested, as well as the charging test and the discharging test between the first energy storage device to be tested and the second energy storage device to be tested, and installing at least one DC hanging cabinet on the outer wall of the energy storage charging and discharging device, the utility model can be deployed in an integrated manner, reducing the back and forth movement of the container, and can realize mutual charging and discharging between different energy storage devices to be tested without the need for mains power, thereby improving the efficiency of the charging test and the discharging test of the energy storage device to be tested, and making the testing process safer and more convenient.

[0060] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0061] The above is a detailed introduction to the energy storage charging and discharging device and the energy storage charging and discharging system provided by the embodiments of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present invention. Those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy storage charging and discharging device, characterized in that: include: A bidirectional energy storage converter is electrically connected to a removable mains wall cabinet; a first DC converter, electrically connected to the bidirectional energy storage converter; a DC busbar, electrically connected to the first energy storage device to be tested and the first DC converter; a second DC converter, electrically connected to the second energy storage device to be tested and the DC bus; a controller, electrically connected to the bidirectional energy storage converter, the first DC converter, the DC bus, and the second DC converter, respectively, for controlling a charging test and a discharging test on the first energy storage device to be tested or the second energy storage device to be tested, and a charging test and a discharging test between the first energy storage device to be tested and the second energy storage device to be tested; The energy storage charging and discharging equipment further includes at least one DC wall-mounted cabinet installed on an outer wall of the energy storage charging and discharging equipment. The second DC converter is electrically connected to the first energy storage device to be tested through at least one DC wall-mounted cabinet.

2. The energy storage charging and discharging device according to claim 1, characterized in that: The bidirectional energy storage converter has an AC input terminal and a first DC output terminal. The AC input terminal is electrically connected to a mains wall cabinet. The first DC output terminal is used to transmit multiple pairs of first DC signals.

3. The energy storage charging and discharging device according to claim 2, characterized in that: The first DC converter has a first DC input terminal and a second DC output terminal. The first DC input terminal is electrically connected to the first DC output terminal of the bidirectional energy storage converter. The first DC output terminal is used to transmit at least two pairs of second DC signals. The second DC output terminal is electrically connected to the DC bus.

4. The energy storage charging and discharging device according to claim 3, characterized in that: The DC busbar has a second DC input terminal and a third DC output terminal, the second DC input terminal is electrically connected to the second DC output terminal of the first DC converter, and the third DC output terminal is electrically connected to the first energy storage device to be tested to output multiple pairs of third DC signals to the first energy storage device to be tested.

5. The energy storage charging and discharging device according to claim 4, characterized in that: The second DC converter has a third DC input terminal and a fourth DC output terminal, the third DC input terminal is electrically connected to the second DC input terminal of the DC bus, and the fourth DC output terminal is electrically connected to the second energy storage device to be tested, so as to output at least one pair of fourth DC signals to the second energy storage device to be tested.

6. The energy storage charging and discharging device according to claim 4, characterized in that: The energy storage charging and discharging equipment further includes: a third DC converter, the third DC converter having a fourth DC input terminal and a fifth DC output terminal, the fourth DC input terminal being electrically connected to the second DC input terminal of the DC bus, and the fifth DC output terminal being electrically connected to the second energy storage device to be tested, so as to output at least two pairs of fifth DC signals to the second energy storage device to be tested.

7. The energy storage charging and discharging device according to claim 6, characterized in that: The energy storage charging and discharging equipment includes at least two DC wall cabinets, the second DC converter is electrically connected to the first energy storage device to be tested through at least one DC wall cabinet, and the third DC converter is electrically connected to the second energy storage device to be tested through at least another DC wall cabinet.

8. The energy storage charging and discharging device according to claim 6, characterized in that: The first DC converter, the second DC converter and the third DC converter are all multi-stage structures, wherein the first DC converter is provided with at least three-stage DC / DC conversion units, and the second DC converter and the third DC converter are respectively provided with at least eight-stage DC / DC conversion units.

9. The energy storage charging and discharging device according to any one of claims 1 to 7, characterized in that: The DC commutator includes a contactor and a shunt release electrically connected to the contactor. The contactor is provided with a plurality of normally open contacts and a plurality of normally closed contacts, wherein at least two normally open contacts are connected to the bidirectional energy storage converter, and at least two normally open contacts are connected to the first energy storage device to be tested.

10. An energy storage charging and discharging system, characterized in that: The energy storage charging and discharging system includes the energy storage charging and discharging equipment as described in claims 1-9 and at least two energy storage devices to be tested.

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