CN219697311U - Energy storage system and energy storage equipment - Google Patents

Abstract

The utility model discloses an energy storage system and energy storage equipment, wherein a battery in the energy storage system is connected between positive and negative direct current buses, and a metal component of the energy storage device is connected with an equipotential node configured according to the positive and negative direct current buses. Since the equipotential node is connected to the metal part, the metal part is equipotential to the equipotential node. And because the equipotential nodes are configured according to the positive and negative direct current buses. Therefore, the effective clamp potential of the metal component can be realized, and the metal component is prevented from being damaged by suspended potential discharge in a high-voltage environment, so that the requirements on the internal insulation design of the energy storage system are reduced.

Description

Energy storage system and energy storage equipment

Cross Reference to Related Applications

The utility model is based on the application number: 202223148733.9, the priority of which is filed by the Chinese patent application "energy storage system and energy storage device" having an application date of 2022, 11 and 25, the entire contents of which are incorporated herein by reference.

Technical Field

The utility model relates to the field of batteries, in particular to an energy storage system and energy storage equipment.

Background

Currently, a new energy storage system may include a plurality of battery modules with power modules connected in parallel with the power modules. The power module is capable of converting and transmitting alternating current to the battery module to cause the battery module to store electrical energy. While the battery module connected with the power module in parallel in the energy storage system and other electronic devices and the like are in a high-voltage environment, no effective protection measures exist yet.

Disclosure of Invention

In view of the above problems, the present utility model provides an energy storage system and an energy storage device, which can solve the problem of high requirement on internal insulation design in the energy storage system in the related art.

In a first aspect, there is provided an energy storage system comprising:

the power unit is configured to convert alternating current and provide the alternating current to positive and negative direct current buses or transmit electric energy;

the energy storage device is connected between the positive and negative direct current buses in parallel, and comprises a metal component and at least one battery, wherein the battery is connected between the positive and negative direct current buses, and the metal component is connected with an equipotential node configured according to the positive and negative direct current buses.

The battery in the energy storage system is connected between the positive and negative direct current buses, and the metal component of the energy storage device is connected with equipotential nodes configured according to the positive and negative direct current buses. Since the equipotential nodes are connected to the metal part, the metal part is equipotential to the equipotential nodes. And because equipotential nodes are configured according to positive and negative direct current buses, effective clamp potential of the metal component can be realized, and other devices in an energy storage system in the system are prevented from being damaged by suspended potential discharge of the metal component in a high-voltage environment, so that the requirement on the internal insulation design of the energy storage system is reduced.

Optionally, the equipotential node is configured according to a negative direct current bus of the positive and negative direct current buses, and because the equipotential node is connected with the negative direct current bus, the potential floating of the equipotential node caused by a surge can be effectively prevented.

Optionally, the equipotential nodes are configured according to positive direct current buses of the positive and negative direct current buses, and because the equipotential nodes are connected with the positive direct current buses, the potential floating of the equipotential nodes caused by surge can be effectively prevented.

Compared with the equipotential nodes configured according to the positive direct current bus, the equipotential nodes are better in effect of preventing the equipotential nodes from floating due to surges when configured according to the negative direct current bus, and the equipotential nodes are better in equipotential effect.

Optionally, the energy storage device further includes an electric box corresponding to each battery, the metal component includes a first housing, the electric box is disposed in the first housing, and a housing of the electric box is connected with the first housing. Therefore, the effective clamp potential of the shell of the electric box and the shell of the battery can be realized, the shell of the electric box and the shell of the battery are prevented from suspending potential discharge in a high-voltage environment to damage other devices in an energy storage system in the system, and the internal insulation design requirement of the energy storage system is further reduced.

Optionally, the energy storage device further comprises a main control box, and a shell of the main control box is connected with the first shell. Therefore, the effective clamp potential of the shell of the main control box can be realized, the shell of the main control box is prevented from suspending potential discharge in a high-voltage environment to damage other devices in the energy storage system in the system, and the internal insulation design requirement of the energy storage system is further reduced.

Optionally, the main control box is located outside the first housing, or the main control box is disposed in the first housing.

Optionally, a main positive switch, a main negative switch, a pre-charging switch and a pre-charging resistor are further arranged in the main control box, the main positive switch is connected with a positive direct current bus in the positive and negative direct current buses in series, the pre-charging switch is connected with the pre-charging resistor in series and then connected with the main positive switch in parallel, the main negative switch is connected with a negative direct current bus in the positive and negative direct current buses in series, wherein the equipotential node is configured according to the negative direct current bus between the main negative switch and the power unit, and the shell of the main control box is connected with the equipotential node.

The equipotential node is directly connected with the shell of the main control box, the shell of the main control box is connected with the first shell, and the first shell is connected with the shell of each electric box, so that the equipotential node is connected with the shell of the main control box, the first shell and the shell of each electric box.

Alternatively, when there are a plurality of batteries, the plurality of batteries are connected in series.

Optionally, when the energy storage devices are multiple, the energy storage devices are respectively connected in parallel between the positive and negative direct current buses, and the metal component of each energy storage device is connected with the corresponding equipotential node.

The plurality of energy storage devices connected in parallel can adopt the same equipotential mode or different equipotential modes. The same equipotential mode is adopted, so that single potential distribution in the energy storage system can be ensured, and the insulation problem is avoided.

Optionally, when the energy storage devices are multiple, the energy storage devices are respectively connected in parallel between the positive and negative direct current buses, and the metal component of any one of the energy storage devices is connected with the equipotential node, and the metal components of the energy storage devices are connected in series. According to the implementation mode, the plurality of parallel energy storage devices are guaranteed to adopt the same equipotential mode, single potential distribution in the energy storage system can be guaranteed, and the insulation problem is avoided.

Optionally, the power unit is disposed in a power box, and a housing of the power box is connected to a negative dc bus of the positive and negative dc buses.

Optionally, the power unit is configured by a power device as a half-bridge circuit, a full-bridge circuit or an energy storage converter.

Optionally, the input end of the power unit is provided with a bypass switch.

Optionally, the equipotential nodes are connected to the metal component by wire, welding, or bolting.

In a second aspect, an energy storage device is provided, which includes the energy storage system of the above aspect.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of another energy storage system provided in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of yet another energy storage system provided by an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of yet another energy storage system provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of yet another energy storage system provided by an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of an energy storage device according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of another energy storage device provided by an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of yet another energy storage device provided by an embodiment of the present disclosure.

Detailed Description

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.

The power module of the conventional energy storage system is connected in series with a battery module, and if the system voltage is low, for example, the system voltage is lower than 1500V, the housing of the battery module is generally directly grounded, and the high-voltage loop and the housing of the battery module can meet the insulation and voltage-resistant requirements under the corresponding voltage level. For a high-voltage direct-current power transmission and distribution system, the voltage level of the system is very high, for example, the voltage level of the system can reach tens of kilovolts or even hundreds of kilovolts, so that a shell of a power module in the energy storage system cannot be directly grounded, and a high-voltage supporting insulator is generally adopted to support the power module.

For a new energy storage system, a plurality of battery modules may be included with a power module in parallel with the power module. The power module is capable of converting and transmitting alternating current to the battery module to cause the battery module to store electrical energy. While the battery module connected with the power module in parallel in the energy storage system and other electronic devices and the like are in a high-voltage environment, no effective protection measures exist yet.

Fig. 1 is a schematic diagram of an energy storage system according to an embodiment of the disclosure, and as shown in fig. 1, the energy storage system 100 may include a power unit 10 and an energy storage device 20.

The power unit 10 is configured to convert alternating current and provide positive and negative direct current buses, or to transfer electrical energy.

Alternatively, the power unit 10 is configured to convert alternating current to direct current and provide to positive and negative direct current buses, or to transfer electrical energy.

The energy storage device 20 is connected in parallel between the positive and negative dc buses, and the energy storage device 20 may include a metal component connected to an equipotential node configured according to the positive and negative dc buses and at least one battery.

Alternatively, the energy storage device 20 may be multiple, and the multiple energy storage devices 20 are connected in parallel between the positive and negative dc buses. Fig. 1 illustrates two examples of the energy storage device 20.

Since the equipotential node is connected to the metal part, the metal part is equipotential to the equipotential node. And because equipotential nodes are configured according to positive and negative direct current buses, effective clamp potential of the metal component can be realized, voltage between the buses and the metal component is reduced, and other devices in an energy storage system in the system are prevented from being damaged by suspension potential discharge of the metal component in a high-voltage environment. In addition, as the equipotential nodes are configured according to the positive and negative direct current buses, under the condition that the energy storage system is in surge, the potential floating of the equipotential nodes caused by the surge can be effectively prevented.

In summary, the embodiments of the present disclosure provide an energy storage system, in which a battery is connected between positive and negative dc buses, and a metal component of the energy storage device is connected to an equipotential node configured according to the positive and negative dc buses. Since the equipotential node is connected to the metal part, the metal part is equipotential to the equipotential node. And because equipotential nodes are configured according to positive and negative direct current buses, effective clamp potential of the metal component can be realized, and other devices in an energy storage system in the system are prevented from being damaged by suspended potential discharge of the metal component in a high-voltage environment, so that the requirement on the internal insulation design of the energy storage system is reduced.

In the disclosed embodiments, the equipotential nodes K may be connected to the metal part by means of wires, welding, or bolting. Alternatively, the metal part may include a first housing 20a, and the at least one battery B is disposed within the first housing 20 a. Fig. 2 illustrates an example of an energy storage device 20 comprising two batteries B connected between positive and negative dc buses.

Referring to fig. 2, the energy storage device 20 may further include an electric cabinet 21, and the first housing 20a may be a housing of the electric cabinet 21.

In an alternative implementation of the disclosed embodiments, referring to fig. 2, the equipotential node K may be configured according to a negative dc bus D-of the positive and negative dc buses, e.g., the equipotential node K may be connected to the negative dc bus D-. Because the equipotential node K is connected with the negative direct current bus D-, the potential of the equipotential node K is the same as the potential of the negative direct current bus D-under the condition that a surge occurs in the energy storage system, and therefore the potential floating of the equipotential node caused by the surge can be effectively prevented.

In another alternative implementation of the disclosed embodiments, the equipotential node K may be configured according to the positive dc bus d+ of the positive and negative dc buses, e.g., the equipotential node K may be connected to the positive dc bus d+. Because the equipotential node K is connected with the positive direct current bus D+, under the condition that a surge occurs in the energy storage system, the potential of the equipotential node K is the same as that of the positive direct current bus D+, and therefore the potential floating of the equipotential node caused by the surge can be effectively prevented.

Compared with the equipotential node K configured according to the positive direct current bus D+, the equipotential node K has better effect of preventing the electric potential of the equipotential node K from floating due to the surge and better equipotential effect of the equipotential node K when the equipotential node K is configured according to the negative direct current bus D-.

Referring to fig. 2, the energy storage device 20 may further include an electric box 22 provided corresponding to each battery B, the electric box 22 being disposed within the first housing 20a, and a case 22a of the electric box 22 being connected with the first housing 20 a. The housing 22a of the electric box 22 may be connected to the first housing 20a by wire, welding, or bolting.

Optionally, when the number of the electric boxes 22 is plural, the plural electric boxes 22 are in one-to-one correspondence with the plural electric boxes 22, and the plural electric boxes B are connected in series. Fig. 2 shows that one battery B is provided in each of the electric boxes 22, and two batteries B are connected in series.

Since the first housing 20a is connected to the equipotential node K and the housing 22a of each of the electric boxes 22 is connected to the first housing 20a, the housing 22a of each of the electric boxes 22 is also connected to the equipotential node K, i.e., the metal part may further include the housing 22a of each of the electric boxes 22, the housing 22a of each of the electric boxes 22 being equipotential to the equipotential node K. Therefore, effective clamp potential of the shell 22a of the electric box 22 and the shell of the battery B can be realized, and the shell 22a of the electric box 22 and the shell of the battery B are prevented from suspending potential discharge in a high-voltage environment to damage other devices in an energy storage system in the system, so that the internal insulation design requirement of the energy storage system is reduced.

Referring to fig. 2, the energy storage device 20 may further include a main control box 23, wherein a housing 23a of the main control box 23 is connected to the first housing 20a, and the housing 23a of the main control box 23 may be connected to the first housing 20a by means of a wire, welding, or bolt locking. The main control box 23 may be disposed outside the first housing 20a, or the main control box 23 may be disposed inside the first housing 20 a.

Since the first housing 20a is connected to the equipotential node K and the housing 23a of the main control box 23 is connected to the first housing 20a, the housing 23a of the main control box 23 is also connected to the equipotential node K, i.e. the metal part may further include the housing 23a of the main control box 23, and the housing 23a of the main control box 23 is equipotential to the equipotential node K. Therefore, effective clamp potential of the shell 23a of the main control box 23 can be realized, the shell 23a of the main control box 23 is prevented from suspending potential discharge in a high-voltage environment to damage other devices in an energy storage system in the system, and further, the internal insulation design requirement of the energy storage system is reduced. And at the same time, the voltage between the outer shell 23a of the main control box 23 and the bus can be effectively reduced.

Referring to fig. 2, a main positive switch S1, a main negative switch S2, a precharge switch S3, and a precharge resistor R1 are further provided in the main control box 23.

The main positive switch S1 is connected in series with a positive dc bus d+ of the positive and negative dc buses, and after the precharge switch S3 and the precharge resistor R1 are connected in series, they are connected in parallel with the main positive switch S1, that is, the precharge switch S3 and the precharge resistor R1 which are sequentially connected in series are connected in parallel with the main positive switch S1. The main negative switch S2 is connected in series with a negative direct current bus D-of the positive and negative direct current buses. The precharge switch S3 is turned on during precharge, and the precharge resistor r can perform a current limiting function. After the precharge is finished, the main positive switch S1 and the main negative switch S2 are turned on.

Wherein the equipotential node K is configured according to a negative dc bus D-between the main negative switch S2 and the power unit 10, and the housing 23a of the main control box 23 is connected to the equipotential node K. I.e. the equipotential node K is connected to the negative dc bus D-between the main negative switch S2 and the power cell 10.

Alternatively, the equipotential node K is configured according to the positive dc bus d+ between the main negative switch S2 and the power unit 10, and the housing 23a of the main control box 23 is connected to the equipotential node K. I.e. the equipotential node K is connected to the positive dc bus D + between the main positive switch S1 and the power cell 10.

Referring to fig. 2, since the equipotential node K is directly connected to the housing 33a of the main control box 23, the housing 33a of the main control box 33 is connected to the first housing 20a, and the first housing 20a is connected to the housing 22a of each of the electric boxes 22, the equipotential node K is connected to the housing 23a of the main control box 23, the first housing 20a, and the housing 22a of each of the electric boxes 22.

Referring to fig. 2, the main control box may further include two fuses F, one of which is connected in series with the main positive switch S1 and the other of which is connected in series with the main negative switch S2.

When there are multiple energy storage devices 20, in an alternative implementation manner of the embodiment of the present disclosure, referring to fig. 3 and 4, the multiple energy storage devices 20 are respectively connected in parallel between the positive and negative dc buses, and the metal component (such as the housing 23a of the main control box 23) of each energy storage device 20 is connected to the corresponding equipotential node K. I.e. each energy storage device 20 has an equipotential node K provided therein.

Optionally, the equipotential node K is configured according to a negative dc bus D-between the main negative switch S2 and the power unit 10, and the housing 23a of the main control box 23 is connected to the equipotential node K.

In the embodiment of the disclosure, the plurality of parallel energy storage devices may adopt the same equipotential mode (i.e., the equipotential nodes of different energy storage devices are configured according to the negative dc bus and the positive dc bus), or may adopt different equipotential modes. The same equipotential mode is adopted, so that single potential distribution in the energy storage system can be ensured, and the insulation problem is avoided.

When there are multiple energy storage devices 20, in another alternative implementation manner of the embodiment of the present disclosure, referring to fig. 5, the multiple energy storage devices 20 are respectively connected in parallel between the positive and negative dc buses, and the metal component (such as the housing 23a of the main control box 23) of any one of the multiple energy storage devices 20 is connected to the equipotential node K, and the metal components (such as the housing 23a of the main control box 23) of the multiple energy storage devices 20 are connected in series. Fig. 5 illustrates an example in which the two energy storage devices 30 are connected in parallel between the positive and negative dc buses.

The equipotential node K may be configured on the basis of the positive dc bus d+ or on the basis of the negative dc bus D-. The equipotential node K may be directly connected to the main control box 23 or may be directly connected to the first housing 20a, i.e., the equipotential node K may be located in the first housing 20 a. Referring to fig. 5, the equipotential node K may be configured according to a negative dc bus D-, and directly connected with the main control box 23.

Referring to fig. 5, if the main control box 23 of the plurality of energy storage devices 20 is located outside the electric cabinet 21, the housings 23a of the main control boxes 23 of the plurality of energy storage devices may be connected in series, thereby achieving the series connection of the plurality of energy storage devices 20. Any two housings 23a of the plurality of main control housings 23 may be connected by wire, welding or bolt locking.

If the main control box 23 of the plurality of energy storage devices 20 is located within the electric cabinet 21, the housings 21a of the electric cabinets 21 of the plurality of energy storage devices may be connected in series, thereby achieving a series connection of the plurality of energy storage devices 20. The housings 21a of any two of the plurality of electrical cabinets 21 may be connected by wire, welding, or bolt locking.

Since the metal components of any one of the plurality of energy storage devices 20 are connected to the equipotential node K and the metal components of the plurality of energy storage devices 20 are connected in series, the metal components of the plurality of energy storage devices 20 are all connected to the equipotential node K.

In the embodiment of the disclosure, the parallel energy storage devices adopt the same equipotential mode, so that single potential distribution in the energy storage system can be ensured, and the insulation problem is avoided.

Referring to fig. 3 to 5, the power unit 10 is disposed within a power box 30, and a housing 30a of the power box 30 is connected to a negative dc bus D-of the positive and negative dc buses. The input end of the power unit 10 is provided with a bypass switch S4, and the bypass switch S4 is used for being turned off when the energy storage system fails and turned on when the energy storage system works normally.

Referring to fig. 3 and 5, the power cell 10 may be configured as a half-bridge circuit by a power device, which may include a first power switch S5, a second power switch S6, a storage capacitor C, and a dividing resistor R2. One end of the first power switch S5 is connected with one end of the bypass switch S4 and one end of the second power switch S6, the other end of the first power switch S5 is connected with one end of the energy storage capacitor C, one end of the voltage dividing resistor R2 and the positive dc bus d+ respectively, and the other end of the second power switch S6 is connected with the other end of the energy storage capacitor C, the other end of the voltage dividing resistor R2 and the negative dc bus D-.

Alternatively, referring to fig. 4, the power unit 10 may be configured as a full bridge circuit by a power device, which may include a first power switch S5, a second power switch S6, third and fourth power switches S7 and S8, a storage capacitor C, and a dividing resistor R2.

One end of the first power switch S5 is connected with one end of the bypass switch S4 and one end of the second power switch S6, the other end of the first power switch S5 is connected with one end of the third power switch S7, one end of the energy storage capacitor C, one end of the voltage dividing resistor R2 and the positive dc bus d+ respectively, and the other end of the second power switch S6 is connected with one end of the fourth power switch S8, the other end of the energy storage capacitor C, the other end of the voltage dividing resistor R2 and the negative dc bus D-. The other end of the fourth power switch S8 is also connected to the other end of the bypass switch S4.

Alternatively, the power unit 10 may be configured by a power device as an energy storage converter (PCS, power conversion system).

In an embodiment of the disclosure, the metal component may further include a housing of the control device, a ground terminal of the control device, a housing of the relay, a housing of the power unit, a housing of the electrical converter, and a water cooling plate. The control device can be used for controlling charge and discharge, and the electric converter can be a direct current/alternating current (DC/AC), an AC/DC or a DC/DC device.

Alternatively, the metal component may comprise a housing of the electronic device, i.e. the equipotential node K is further adapted to be connected with the housing of the electronic device in the energy storage system. Optionally, the housing of the electronic device may include one or more of the following: the power module comprises a shell of an electric cabinet, a shell of an electric box, a shell of a main control box, a shell of a battery, a shell of a control device, a shell of a relay, a shell of a power module and a shell of an electric converter.

In summary, the embodiments of the present disclosure provide an energy storage system, in which a battery is connected between positive and negative dc buses, and a metal component of the energy storage device is connected to an equipotential node configured according to the positive and negative dc buses. Since the equipotential node is connected to the metal part, the metal part is equipotential to the equipotential node. And because equipotential nodes are configured according to positive and negative direct current buses, effective clamp potential of the metal component can be realized, and other devices in an energy storage system in the system are prevented from being damaged by suspension potential discharge of the metal component in a high-voltage environment, so that the requirement on the internal insulation design of the energy storage system is reduced.

Embodiments of the present disclosure provide an energy storage device that may include an energy storage system as described in the embodiments above, such as any of the energy storage systems shown in fig. 1-5.

Referring to fig. 6 to 8, the energy storage system 100 is plural, and the plural energy storage systems 100 are cascade-connected.

Referring to fig. 6, the energy storage device 1000 may be a direct current hanging energy storage device, and the energy storage device 1000 can be used for implementing functions of power output, energy storage and the like based on the received direct current transmitted by the positive and negative direct current buses. Referring to fig. 6, the energy storage device 1000 may further include an isolation switch M, a starting resistor R3, a starting switch S9, and a first reactor L1. The start-up resistor R3 is used to protect the energy storage device 1000 during start-up of the energy storage device. One end of the isolating switch M is connected with the positive DC bus P+, and the other end of the isolating switch M is connected with one end of the starting resistor R3 and one end of the starting switch S9 respectively. The other end of the starting resistor R3 and the other end of the starting switch S9 are connected with one end of a first reactor L1, the other end of the first reactor L1 is connected with one ends of a plurality of cascade-connected energy storage systems 100, and the other ends of the plurality of cascade-connected energy storage systems 100 are connected with a negative direct current bus P-. In such an implementation, the power cells in the energy storage system are used to transfer direct current.

Referring to fig. 7, the energy storage device 1000 may also be a modular multi-level energy storage device that may implement ac-dc conversion, control active or reactive output, and the like. Referring to fig. 7, the energy storage device 1000 may include six converter legs, each of which may include a plurality of cascade-connected energy storage systems 100 and second reactors L2, wherein one end of the second reactor L2 in each converter leg is connected to an ac bus X, the other end of the second reactor L2 in each converter leg is connected to one end of the plurality of cascade-connected energy storage systems 100, and the other ends of the plurality of cascade-connected energy storage systems 100 are connected to a dc bus W. The energy storage device 1000 is configured to convert dc power transmitted by the dc bus W into ac power, and transmit the ac power to the electric device through the ac bus X.

Referring to fig. 8, the energy storage device 1000 may also be a cascade energy storage device, where the energy storage device 1000 can be used to implement functions such as power output and energy storage based on the received ac power transmitted by the ac bus. The energy storage device 1000 may include three converter legs, each of which may include a third reactor L3 and a plurality of energy storage systems 100 connected in cascade, where one end of the third reactor L3 of each converter leg is connected to the ac bus X, and the other end of the third reactor L3 of each converter leg is connected to one end of the plurality of energy storage systems 100 connected in cascade, and the three converter legs include the plurality of energy storage systems 100 connected in cascade, and the other ends of the plurality of energy storage systems 100 connected in cascade are connected to each other.

Embodiments of the present disclosure provide a power plant that may include an energy storage device as described in the above embodiments, such as the energy storage device 1000 described above and illustrated in fig. 6-8.

It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

In the description of the present specification, a description referring to the terms "one embodiment," "alternative," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first," "second," and the like, as used in embodiments of the present disclosure, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in the present embodiment. Thus, a feature of an embodiment of the present disclosure that is defined by terms such as "first," "second," and the like may explicitly or implicitly indicate that at least one such feature is included in the embodiment. In the description of the present disclosure, the word "plurality" means at least two or more, for example, two, three, four, etc., unless explicitly specified otherwise in the examples.

In this disclosure, unless expressly specified or limited otherwise in the examples, the terms "mounted," "connected," and "secured" and the like as used in the examples are intended to be broadly construed, as for example, the connection may be a fixed connection, may be a removable connection, or may be integral, and as may be a mechanical connection, an electrical connection, or the like; of course, it may be directly connected, or indirectly connected through an intermediate medium, or may be in communication with each other, or in interaction with each other. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art depending on the specific implementation.

Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.

Claims (15)

1. An energy storage system, comprising:

the power unit is configured to convert alternating current and provide the alternating current to positive and negative direct current buses or transmit electric energy;

the energy storage device is connected in parallel between the positive and negative direct current buses, the energy storage device comprises a metal component and at least one battery, the battery is connected between the positive and negative direct current buses, and the metal component is connected with an equipotential node configured according to the positive and negative direct current buses.

2. The energy storage system of claim 1, wherein the equipotential nodes are configured according to negative dc buses of the positive and negative dc buses.

3. The energy storage system of claim 1, wherein the equipotential nodes are configured according to positive dc buses of the positive and negative dc buses.

4. The energy storage system of claim 1, wherein the energy storage device further comprises an electrical box disposed for each of the cells, the metal component comprises a first housing, the electrical box is disposed within the first housing, and a housing of the electrical box is coupled to the first housing.

5. The energy storage system of claim 4, wherein the energy storage device further comprises a master control box, a housing of the master control box being connected to the first housing.

6. The energy storage system of claim 5, wherein the master control box is located outside of the first housing or the master control box is disposed within the first housing.

7. The energy storage system of claim 5, wherein a main positive switch, a main negative switch, a pre-charge switch and a pre-charge resistor are further disposed in the main control box, the main positive switch is connected in series with a positive dc bus of the positive and negative dc buses, the pre-charge switch and the pre-charge resistor are connected in series and then connected in parallel with the main positive switch, the main negative switch is connected in series with a negative dc bus of the positive and negative dc buses, wherein the equipotential node is configured according to the negative dc bus between the main negative switch and the power unit, and a housing of the main control box is connected with the equipotential node.

8. The energy storage system of claim 1, wherein when the number of cells is plural, the plurality of cells are connected in series.

9. The energy storage system of any of claims 1-8, wherein when there are a plurality of energy storage devices, the plurality of energy storage devices are respectively connected in parallel between the positive and negative dc buses, and the metal component of each energy storage device is connected to a corresponding equipotential node.

10. The energy storage system according to any one of claims 1-8, wherein when the plurality of energy storage devices are provided, the plurality of energy storage devices are respectively connected in parallel between the positive and negative dc buses, and the metal component of any one of the plurality of energy storage devices is connected to the equipotential node, and the metal components of the plurality of energy storage devices are connected in series.

11. The energy storage system of claim 1, wherein the power unit is disposed within a power box, a housing of the power box being connected to a negative one of the positive and negative dc buses.

12. The energy storage system of claim 1, wherein the power cells are configured by power devices as half-bridge circuits, full-bridge circuits, or energy storage converters.

13. The energy storage system of claim 1, wherein the input of the power cell is provided with a bypass switch.

14. The energy storage system of claim 1, wherein the equipotential nodes are connected to the metal component by wire, welding, or bolting.

15. An energy storage device comprising an energy storage system according to any one of claims 1-14.