Energy storage system and electric equipment

Abstract

An energy storage system and electric equipment, the energy storage system comprises a battery compartment and a live wire terminal, the battery compartment comprises M battery modules, the M battery modules are sequentially connected in series, and M is a positive integer greater than or equal to 2; the first end of the live wire terminal is electrically connected with the first battery module, and the second end of the live wire terminal is electrically connected with the grid-connected cabin, so that the battery cabin transmits electric energy through the grid-connected cabin. The live wire terminal is arranged in the energy storage system, and the first battery module is electrically connected with the grid-connected cabin through the live wire terminal, so that an operator can directly disconnect the live wire terminal, the cutoff of the energy storage system is realized, and the operator is protected.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system and electrical equipment. Background Art

[0002] At present, the high-voltage energy storage system adopts the power connection method between the air-cooled battery cabins. One end of the energy storage inverter (power control system, PCS) in the first air-cooled battery cabin is directly connected to the grid cabin through the power cable to achieve electrical connection. The grid cabin and the PCS are not in the same container. It is impossible to judge whether the PCS side switch or the grid cabin high-voltage equipment switch is disconnected before connecting the power cable. The energy storage system is in the high-voltage part, and it is easy to make mistakes and close the PCS side or the grid cabin high-voltage equipment switch. When operating another container, there may be a risk of live operation, and the safety factor is low. Utility Model Content

[0003] The purpose of this application is to provide an energy storage system and electrical equipment to solve the problem that the energy storage system is prone to the risk of live operation and has a low safety factor.

[0004] An energy storage system comprises a battery compartment and a live wire terminal, wherein the battery compartment comprises M battery modules, and the M battery modules are sequentially connected in series, wherein M is a positive integer greater than or equal to 2; one end of the live wire terminal is electrically connected to the first battery module, and the second end of the live wire terminal is electrically connected to a grid-connected compartment, so that the battery compartment transmits electric energy through the grid-connected compartment.

[0005] In one embodiment, the energy storage system further includes a neutral line terminal, and the Mth battery module is electrically connected to the neutral line terminal.

[0006] In one embodiment, the live wire terminal and / or the neutral wire terminal are installed in the battery compartment.

[0007] In one embodiment, one of the grid-connected compartments is electrically connected to one or more of the battery compartments, the first battery module in each of the battery compartments is electrically connected to the grid-connected compartment via the live wire terminal, and the Mth battery modules in multiple battery compartments are electrically connected via the neutral wire terminal.

[0008] In one embodiment, the battery compartment includes a plurality of battery modules, and the first battery module in each battery compartment is electrically connected to a phase line of the grid-connected compartment via the live wire terminal.

[0009] In one embodiment, the neutral terminals in the plurality of battery compartments are connected in a star connection.

[0010] In one embodiment, the energy storage system further includes an energy storage inverter, each of the battery modules is electrically connected to one of the energy storage inverters, and different energy storage inverters are electrically connected via power cables.

[0011] In one embodiment, the energy storage system further includes a battery management unit, and the energy storage inverter is electrically connected to the battery module via the battery management unit.

[0012] In one embodiment, the first electrode of the energy storage inverter electrically connected to the first battery module is electrically connected to the grid-connected cabin through the live wire terminal, the second electrode of the energy storage inverter electrically connected to the i-th battery module is electrically connected to the first electrode of the energy storage inverter electrically connected to the i+1-th battery module, and the first electrode of the energy storage inverter electrically connected to the M-th battery module is electrically connected to the neutral wire terminal, wherein 1≤i≤M.

[0013] In one embodiment, the energy storage system further includes a reactance unit, and the grid-connected cabin is electrically connected to the first battery module via the reactance unit and the live wire terminal in sequence.

[0014] An electrical device, comprising the energy storage system described in any embodiment of the present application, wherein the energy storage system supplies power to the electrical device.

[0015] By setting a live wire terminal in the energy storage system, the first battery module is electrically connected to the grid-connected cabin through the live wire terminal. The operator can directly disconnect the live wire terminal to cut off the current of the energy storage system, thereby protecting the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0017] Figure 1 is a schematic diagram of an energy storage system provided in an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of the connection between the first battery module and the live wire terminal in an energy storage system provided by an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of the connection between the first battery module and the neutral terminal in an energy storage system provided by an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of an energy storage system provided in an embodiment of the present application;

[0021] Figure 5is a schematic diagram of an energy storage system provided in an embodiment of the present application;

[0022] Figure 6 is a connection diagram of the Mth battery module in each battery compartment of an energy storage system provided in an embodiment of the present application;

[0023] Figure 7 It is a schematic diagram of the electrical structure of an energy storage system provided in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] Grid-connected cabin-10, battery cabin-20, battery module-30, energy storage inverter-40, battery management unit-50, live wire terminal-60, neutral wire terminal-70, reactance unit-80, energy storage system-100. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The following descriptions of the various embodiments are made with reference to the attached drawings to illustrate specific embodiments that may be implemented in the present application. Directional terms mentioned herein, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are intended to better and more clearly describe and understand the present application, rather than to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In addition, the serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0029] See also Figure 1An embodiment of the present application provides an energy storage system 100, which includes a grid-connected cabin 10, a battery cabin 20 and a live terminal 60. The battery cabin 20 includes M battery modules 30, which are sequentially connected in series, wherein M is a positive integer greater than or equal to 2; a first end of the live terminal 60 is electrically connected to the first battery module 30, and a second end of the live terminal 60 is electrically connected to the grid-connected cabin 10, so that the battery cabin 20 transmits electrical energy through the grid-connected cabin 10.

[0030] It should be noted that “M” in the drawings of the present application refers to the total number of battery modules 30 in a battery compartment 20 , wherein the battery module 30 may be a battery cluster, a battery cabinet, or a battery module, without specific limitation.

[0031] Among them, M battery modules 30 are arranged in sequence. For example, the M battery modules 30 can be arranged in a row, so that the M battery modules 30 are connected in series in sequence in the order of arrangement to achieve electrical connection between the M battery modules 30; or, the M battery modules 30 can be arranged in multiple rows, and multiple battery modules 30 are provided in one row. In a row of battery modules 30, multiple battery modules 30 are connected in series in sequence in the order of arrangement. Between rows, the last battery module 30 in the first row is connected in series with the last battery module 30 in the second row, and the first battery module 30 in the third row is connected in series with the first battery module 30 in the fourth row, and so on. While connecting multiple rows of battery modules 30 in series, the power cables of the battery modules 30 between rows can be effectively shortened, saving the setting of power cables, effectively saving costs, and making the energy storage system 100 highly integrated, with high energy density and less floor space.

[0032] By setting the live terminal 60 in the energy storage system 100, the first battery module 30 is electrically connected to the grid-connected cabin 10 through the live terminal 60. When the live terminal 60 is in a connected state, it can play a role in dividing the voltage of the energy storage system 100, providing safety protection for live operation, thereby improving the safety factor of the energy storage system 100; in addition, the operator can directly disconnect the live terminal 60 to achieve the current cutoff of the energy storage system 100, which plays a protective role for the operator. At the same time, the live terminal 60 is set to realize the independent electrical connection mode and the electrical isolation connection mode of the energy storage system 100, avoiding the safety hazards of live operation.

[0033] In the present application, the energy storage system 100 may be a cascade energy storage system. The battery module 30 is a liquid-cooled battery module 30, which is installed in a container, and each battery module 30 is connected in series through a power cable, wherein the power cable connects two battery modules 30 by perforation. The energy storage system 100 is a system with suspended high voltage to the ground, the power cable connecting the two battery modules 30 and the connection of the battery module 30 are in different containers, and the power cable between each battery module 30 is in a live state, and the naked eye cannot see whether the power cable is connected. By setting the live terminal 60 and the neutral terminal 70, voltage division and current interruption can be achieved, avoiding the safety hazard of live operation, and protecting the operator.

[0034] The power cables between the battery modules 30 can adopt power cables with consistent specifications and length designs, so that the power cables between the battery modules 30 have good versatility and replaceability, which can effectively improve the layout efficiency of the energy storage system 100, and make the battery modules 30 in the battery compartment 20 arranged reasonably, so that the integration in the battery compartment 20 is higher and the occupied area is reduced.

[0035] Among them, M can be determined according to actual conditions, for example, M can be 10, 13, 15, 20, 21 or 23; for example, when M takes a value of 21, 21 battery modules 30 constitute a high-power, high-current energy storage system, the 21 battery modules 30 are electrically connected in series, and no battery module 30 operates in parallel, and there is no short-board effect or capacity attenuation.

[0036] The energy storage system 100 also includes a neutral terminal 70, and the Mth battery module 30 is electrically connected to the neutral terminal 70. When the neutral terminal 70 is in a connected state, it can play a role in dividing the voltage of the energy storage system 100, providing safety protection for point-on operation, thereby improving the safety factor of the energy storage system 100. In addition, the setting of the neutral terminal 70 can realize an independent electrical connection mode and an electrical isolation connection mode of the energy storage system 100, avoiding the safety hazard of point-on operation.

[0037] The live wire terminal 60 and / or the neutral wire terminal 70 are installed in the battery compartment 20. For example, the live wire terminal 60 and the neutral wire terminal 70 are both installed in the battery compartment 20. The live wire terminal 60 and the neutral wire terminal 70 are protected by the battery compartment 20 to prevent the live wire terminal 60 and the neutral wire terminal 70 from being exposed to the outside and affecting the normal use of the live wire terminal 60 and the neutral wire terminal 70.

[0038] For example, the live terminal 60 is installed in the first battery module 30 , and the neutral terminal 70 is installed in the Mth battery module 30 .

[0039] The live wire terminal 60 may be a socket connected to the live wire, and the neutral wire terminal 70 may be a socket connected to the neutral wire, both of which are used to achieve electrical connection.

[0040] The battery module 30 is installed in a container, and the live terminal 60 can be installed in the first battery module 30 in the container. On the one hand, the container can protect the live terminal 60 and prevent the live terminal 60 from being exposed to the outside and affecting the normal use of the live terminal 60; on the other hand, the live terminal 60 is installed in the first battery module 30, and the power cable connecting the live terminal 60 and the first battery module 30 can be effectively shortened, effectively saving costs.

[0041] Similarly, the neutral terminal 70 is installed in the Mth battery module 30 in the container to protect the neutral terminal 70 and prevent the neutral terminal 70 from being exposed to the outside and affecting the normal use of the neutral terminal 70. Similarly, the neutral terminal 70 is installed in the Mth battery module 30, and the power cable connecting the neutral terminal 70 and the Mth battery module 30 can be effectively shortened, effectively saving costs.

[0042] Please combine Figure 2 and Figure 3 There are multiple interfaces inside the neutral terminal 70 and the live terminal 60 for connecting power cables. For example, one interface in the live terminal 60 is connected to the power cable connected to the grid-connected cabin 10, and another interface in the live terminal 60 is connected to the power cable connected to the first battery module 30.

[0043] Please combine Figure 3 For example, one grid-connected cabin 10 is electrically connected to one or more battery cabins 20 , the first battery module 30 in each battery cabin 20 is electrically connected to the grid-connected cabin 10 via a live terminal 60 , and the Mth battery modules 30 in multiple battery cabins 20 are electrically connected via a neutral terminal 70 .

[0044] The grid-connected cabin 10 is connected to multiple battery cabins 20, and a high-voltage direct current energy storage system can be realized to convert alternating current. The transformer is omitted and the energy storage system 100 of the present application does not require a step-up transformer, and the efficiency is 2% to 2.5% higher than that of a conventional energy storage system, which can save 5% to 6% of the cost of setting up the energy storage inverter 40.

[0045] Please combine Figure 4 The last battery module 30 of each battery compartment 20 is connected to a neutral terminal 70, so that each battery compartment 20 can achieve independent electrical connection and electrical isolation connection, avoiding the safety hazard of live operation.

[0046] Please combine Figure 5For example, the battery compartment 20 includes a plurality of battery modules 30 , and the first battery module 30 of each battery compartment 20 is electrically connected to a phase line of the grid-connected compartment 10 through a live wire terminal 60 .

[0047] The grid-connected cabin 10 is electrically connected to multiple battery cabins 20. For example, the grid-connected cabin 10 is electrically connected to two or three, or more than three battery cabins 20. The first battery module 30 of each battery cabin 20 is electrically connected to a phase line of the grid-connected cabin 10 through the live wire terminal 60, ensuring that each battery cabin 20 can achieve voltage division and current interruption, avoiding safety hazards of live operation.

[0048] When the grid-connected cabin 10 is electrically connected to two battery cabins 20, and 21 battery modules 30 are arranged in each battery cabin 20, and the AC side voltage of each battery module 30 is approximately 275VAC, then each battery cabin 20 can constitute a high-voltage energy storage system 100 of (275VAC*√2*21) approximately 8167VAC, then each battery cabin 20 can directly output a voltage of 8167VAC without a transformer.

[0049] In the present application, the grid-connected cabin 10 is electrically connected to three battery cabins 20, and each battery cabin 20 is provided with 21 battery modules 30. The AC side voltage of each battery module 30 is approximately 275VAC, which can constitute a (275VAC*√3*21) approximately 10000VAC, that is, a 10000VAC high-voltage energy storage system 100. Each battery cabin 20 can directly output a voltage of 10000VAC without a step-up transformer, so that the energy storage system 100 has a higher cycle efficiency and does not require a step-up transformer. The efficiency is 2% to 2.5% higher than that of a conventional energy storage system, which can save 5% to 6% of the energy storage inverter 40 setting cost, is simple to control, and can shorten the response time.

[0050] Please combine Figure 6 For example, the neutral terminals 70 in the plurality of battery compartments 20 are connected in a star connection.

[0051] That is, the third end of each neutral terminal 70 is electrically connected to the battery module 30 , and the fourth ends of the plurality of neutral terminals 70 are connected to the same point.

[0052] The neutral line terminals 70 in each battery compartment 20 are connected to each other. For example, when the grid-connected compartment 10 is connected to three battery compartments 20, the last battery module 30 in the first battery compartment 20 is connected to the neutral line terminal 70 installed in the battery module 30 through a power cable, and the neutral line terminal 70 in the first battery compartment 20 is connected to the neutral line terminal 70 in the second battery compartment 20 through a power cable, wherein the neutral line terminal 70 in the second battery compartment 20 is installed in the last battery module 30 in the second battery compartment 20, and the neutral line terminal 70 in the second battery compartment 20 is connected to the last battery module 30 in the second battery compartment 20 through a power cable; the neutral line terminal 70 in the second battery compartment 20 is connected to the neutral line terminal 70 in the third battery compartment 20 through a power cable, wherein the neutral line terminal 70 in the third battery compartment 20 is connected to the last battery module 30 in the third battery compartment 20 through a power cable.

[0053] In the present application, the energy storage system 100 adopts an H-bridge topology, the primary battery is star-connected, and each phase of the grid-connected cabin 10 is composed of 21 battery modules 30 connected in series, so that high voltage voltage can be directly output without a transformer. The first battery module 30 of each battery cabin 20 is first connected to the live terminal 60 through a power cable, and then the power cable is led out from the live terminal 60 to connect to the one-phase line of the grid-connected cabin 10. The last battery module 30 of each battery module 30 is first connected to the neutral terminal 70 through a power cable, and the neutral terminals 70 of each battery module 30 are connected through power cables to form a high-voltage energy storage system.

[0054] Please combine Figure 1 and Figure 2 For example, the energy storage system 100 further includes an energy storage inverter 40, each battery module 30 is electrically connected to an energy storage inverter 40, and different energy storage inverters 40 are electrically connected via power cables.

[0055] The battery modules 30 are connected to each other through power cables, and the stored direct current is converted into alternating current through the energy storage inverter 40 for use by electrical equipment.

[0056] The battery module 30 is connected to the energy storage inverter 40 in the battery module 30 through a power cable, and different energy storage inverters 40 are connected through power cables. Among them, the first electrode of the energy storage inverter 40 electrically connected to the first battery module 30 is electrically connected to the live wire terminal 60, and then the live wire terminal 60 and a phase line of the grid-connected cabin 10 are connected through a power cable.

[0057] For example, the energy storage system 100 further includes a battery management unit 50 , and the energy storage inverter 40 is electrically connected to the battery module 30 via the battery management unit 50 .

[0058] The battery management unit 50 may be a battery management system (BMS) for monitoring the battery module 30 to manage the charging and discharging of the battery module 30 so that the battery module 30 is in an optimal state.

[0059] Please combine Figure 4 For example, the first electrode of the energy storage inverter 40 directly electrically connected to the first battery module 30 is electrically connected to the grid-connected cabin 10 through the live terminal 60, the second electrode of the energy storage inverter 40 directly electrically connected to the i-th battery module 30 is electrically connected to the first electrode of the energy storage inverter 40 electrically connected to the i+1-th battery module 30, and the first electrode of the energy storage inverter 40 directly electrically connected to the M-th battery module 30 is electrically connected to the neutral terminal 70, where 1≤i≤M.

[0060] It can be understood that the first electrode can be a positive electrode and the second electrode can be a negative electrode; or, the first electrode can be a negative electrode and the second electrode can be a positive electrode, without specific limitation.

[0061] The battery module 30, the energy storage inverter 40 and the battery management unit 50 form a battery unit, and the number of battery modules 30 is equal to the number of battery units. The first electrode of the energy storage inverter 40 in the first battery unit is electrically connected to the grid-connected cabin 10 through the live terminal 60, the second electrode of the energy storage inverter 40 in the i-th battery unit is electrically connected to the first electrode of the energy storage inverter 40 in the i+1-th battery unit, and the first electrode of the energy storage inverter 40 in the M-th battery unit is electrically connected to the neutral terminal 70.

[0062] For example, the grid-connected cabin 10 has three-phase lines, which are respectively recorded as phase A, phase B and phase C, as shown in FIG. Figure 4 As shown in "A", "B", and "C" in FIG. 1 , the three battery compartments 20 are respectively denoted as D compartment, E compartment, and F compartment, respectively. Figure 4 As shown in "D", "E" and "F" in the figure, each battery compartment 20 is provided with 21 battery modules 30, and the 21 battery modules 30 are divided into 4 rows. The first row of battery modules 30 is arranged with 1 to 5 battery modules 30, the second row of battery modules 30 is arranged with 6 to 11 battery modules 30, the third row of battery modules 30 is arranged with 12 to 16 battery modules 30, and the fourth row of battery modules 30 is arranged with 17 to 21 battery modules 30.

[0063] Phase A is connected to the live terminal 60 in the D compartment through a power cable, and the live terminal 60 in the D compartment is connected to the first electrode of the energy storage inverter 40 of the first battery unit in the D compartment through a power cable, and the second electrode of the energy storage inverter 40 is connected to the first electrode of the energy storage inverter 40 in the second battery unit through a power cable, and the second electrode of the energy storage inverter 40 of the second battery unit is connected to the first electrode of the energy storage inverter 40 of the third battery unit through a power cable, and so on, until the first electrode of the energy storage inverter 40 of the twenty-first battery unit is connected to the neutral terminal 70 in the D compartment through a power cable. The connection method between the E compartment and the B phase of the grid-connected compartment 10, and the connection method between the F compartment and the C phase of the grid-connected compartment 10 are the same as the connection method between the D compartment and the A phase of the grid-connected compartment 10. After each battery compartment 20 is connected to a phase line of the grid-connected compartment 10, the neutral terminal 70 of the D compartment is connected to the neutral terminal 70 in the E compartment through a power cable, and the neutral terminal 70 in the E compartment is then connected to the neutral terminal 70 in the F compartment through a power cable to form a high-voltage energy storage system 100.

[0064] Among them, the power cables between the fifth battery cell and the sixth battery cell in a battery compartment 20, and the sixteenth battery cell and the seventeenth battery cell are connected by passing through the wall and running through the internal pipes of the container. Since the pipes and power cables can be pre-set, the two ends of the power cables can be reserved, and then the power cables connecting the two energy storage inverters 40 are connected to achieve the connection of the power cables of the energy storage inverters 40 between cluster levels; the power cables between the eleventh battery cell and the twelfth battery cell are protected by passing through the container and running through underground pipes. The pipes and power cables can be pre-set, and the two ends of the power cables can be reserved. The ends of the two power cables connecting the two energy storage inverters 40 are connected to achieve the connection of the power cables between cluster levels.

[0065] In each battery compartment 20, one end of the power cable connected to the live terminal 60 is pre-connected to the live terminal 60, and the other end of the power cable is reserved. The one-phase line of the grid-connected compartment 10 is connected to one end of another power cable, and the other end of the power cable is reserved. Finally, the reserved end of the power cable connected to the live terminal 60 is connected to the reserved end of the power cable connected to the one-phase line of the grid-connected compartment 10, so as to realize the electrical connection between the grid-connected compartment 10 and the battery compartment 20. Similarly, the power cable exposed to the first battery module 30 and the power cable connected to the grid-connected compartment 10 can be arranged in an underground pipeline to protect the power cables.

[0066] In each battery compartment 20, one end of the power cable connected to the neutral terminal 70 is pre-connected to the neutral terminal 70 in one battery compartment 20, and the other end of the power cable is reserved. The neutral terminal 70 of another battery compartment 20 is pre-connected to another neutral terminal 70, and the other end of the neutral terminal 70 is reserved. Finally, the ends of the two power cables are connected to realize the connection of the neutral terminals 70 between the battery compartments 20. Similarly, the power cable exposed in one battery compartment 20 and connected to the neutral terminal 70 in the battery compartment 20 can be arranged in an underground pipeline, so as to protect the power cable exposed in the container.

[0067] Please combine Figure 4 and Figure 7 For example, the energy storage system 100 further includes a reactance unit 80 , and the grid-connected cabin 10 is electrically connected to the first battery module 30 via the reactance unit 80 and the live wire terminal 60 in sequence.

[0068] Each battery compartment 20 is connected to the grid-connected compartment 10 through the live wire terminal 60 and the reactance unit 80 in sequence, which can avoid the safety hazards caused by live operation and limit the short-circuit current when a short-circuit fault occurs in the energy storage system 100.

[0069] An electrical device includes the energy storage system 100 provided in any embodiment of the present application, and the energy storage system 100 supplies power to the electrical device.

[0070] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An energy storage system, It is characterized in that include: A battery compartment, the battery compartment comprising M battery modules, the M battery modules are sequentially connected in series, wherein M is a positive integer greater than or equal to 2; A live wire terminal, wherein a first end of the live wire terminal is electrically connected to the first battery module, and a second end of the live wire terminal is electrically connected to the grid-connected cabin, so that the battery cabin transmits electrical energy through the grid-connected cabin.

2. The energy storage system according to claim 1, It is characterized in that The energy storage system also includes a neutral line terminal, and the Mth battery module is electrically connected to the neutral line terminal.

3. The energy storage system according to claim 2, It is characterized in that The live wire terminal and / or the neutral wire terminal are installed in the battery compartment.

4. The energy storage system according to claim 2, It is characterized in that One grid-connected compartment is electrically connected to one or more battery compartments, the first battery module in each battery compartment is electrically connected to the grid-connected compartment through the live wire terminal, and the Mth battery modules in multiple battery compartments are electrically connected through the neutral wire terminal.

5. The energy storage system according to claim 4, It is characterized in that The battery compartment includes a plurality of battery modules, and the first battery module in each battery compartment is electrically connected to a phase line of the grid-connected compartment through the live wire terminal.

6. The energy storage system according to claim 5, It is characterized in that The neutral terminals in the plurality of battery compartments are connected in a star connection manner.

7. The energy storage system according to claim 4, It is characterized in that The energy storage system also includes an energy storage inverter, each of the battery modules is electrically connected to one of the energy storage inverters, and different energy storage inverters are electrically connected via power cables.

8. The energy storage system according to claim 7, It is characterized in that The energy storage system further includes a battery management unit, and the energy storage inverter is electrically connected to the battery module via the battery management unit.

9. The energy storage system according to claim 7, wherein the first electrode of the energy storage inverter electrically connected to the first battery module is electrically connected to the grid-connected cabin through the live terminal, the second electrode of the energy storage inverter electrically connected to the i-th battery module is electrically connected to the first electrode of the energy storage inverter electrically connected to the i+1-th battery module, and the first electrode of the energy storage inverter electrically connected to the M-th battery module is electrically connected to the neutral terminal. in, 1≤i≤M.

10. The energy storage system according to claim 4, It is characterized in that The energy storage system further comprises a reactance unit, and the grid-connected cabin is electrically connected to the first battery module via the reactance unit and the live wire terminal in sequence.

11. An electrical device, It is characterized in that It comprises the energy storage system as described in any one of claims 1 to 10, and the energy storage system supplies power to the electrical equipment.

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