Energy storage system

Abstract

Some embodiments of the present application provide an energy storage system comprising an energy storage module, the energy storage module comprising a battery device, a full-control device connected between the first port and the battery device, a filter connected in parallel with the battery device through the first port, a power converter connected between the full-control device and the battery device, and a first controller connected between the full-control device and the battery device. The power converter is connected between the second port of the filter and the power grid, and the first controller is connected with the full-control device and the power converter. In the structure, under the pure reactive working condition, the battery device of the energy storage system is not easy to charge and discharge, so that the loss of the service life of the energy storage device in the energy storage system is reduced, and the service life of the energy storage device in the energy storage system is favorably prolonged.

Description

Technical Field

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

[0002] Battery devices have the advantages of high specific energy and high power density. They are widely used in energy storage devices such as energy storage containers or energy storage cabinets. Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems.

[0003] Since energy storage devices have advantages such as large capacity and high degree of integration, their application range is becoming increasingly wide. How to extend the service life of energy storage devices has attracted more and more attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, the present application provides an energy storage system, in which the energy storage device has a longer service life.

[0005] In a first aspect, some embodiments of the present application provide an energy storage system, comprising an energy storage module, the energy storage module comprising a battery device, a fully-controlled device, a filter, a power converter, and a first controller, the filter comprising a first port and a second port, the filter being connected in parallel with the battery device through the first port, the fully-controlled device being connected between the first port and the battery device, the power converter being connected between the second port and the power grid, and the first controller being connected to the fully-controlled device and the power converter.

[0006] In the above structure, because a fully-controlled device is connected between the first port of the filter and the battery device, and the first controller is connected to the fully-controlled device and the power converter, the first controller can disconnect the electrical connection between the first port and the battery device when controlling the power converter to operate in a purely reactive mode, thereby preventing the power grid from inducing current to charge or discharge the battery device. Furthermore, when controlling the power converter to operate in an active mode, the first controller can connect the first port to the battery device, enabling the power grid to charge the battery device or the battery device to supply power to the power grid. Because the battery device of the energy storage system is less susceptible to charge and discharge under purely reactive conditions, the loss of service life of the energy storage device in the energy storage system is reduced, thereby facilitating the extension of the service life of the energy storage device in the energy storage system.

[0007] According to the energy storage system provided in some embodiments of the present application, the fully-controlled device includes a bidirectional fully-controlled device. By including a bidirectional fully-controlled device, when the fully-controlled device is turned on, the power grid can both charge the battery device and the battery device can supply power to the power grid, allowing the energy storage module to perform active peak load shifting for the power grid.

[0008] According to the energy storage system provided in some embodiments of the present application, the fully-controlled device includes two unidirectional fully-controlled devices, which are connected in parallel and arranged in opposite directions. By having the fully-controlled device include two unidirectional fully-controlled devices, and the two unidirectional fully-controlled devices are connected in parallel and arranged in opposite directions, both forward and reverse currents can flow between the filter and the battery device. When the fully-controlled device is turned on, the power grid can charge the battery device, and the battery device can also supply power to the power grid, allowing the energy storage module to perform active peak-shaving and valley-filling for the power grid.

[0009] According to the energy storage system provided in some embodiments of the present application, the battery device includes a first polarity terminal and a second polarity terminal with opposite polarity, and the fully-controlled device is connected between the first polarity terminal and the first port or between the second polarity terminal and the first port. The fully-controlled device is connected between the first polarity terminal and the first port, so that the fully-controlled device can disconnect the electrical connection between the battery device and the filter by disconnecting the electrical connection between the first polarity terminal and the wiring terminal in the first port. The fully-controlled device is connected between the second polarity terminal and the first port, so that the fully-controlled device can disconnect the electrical connection between the battery device and the filter by disconnecting the electrical connection between the second polarity terminal and the wiring terminal in the first port.

[0010] According to the energy storage system provided in some embodiments of the present application, the power converter includes a third port and a fourth port. The third port is connected to the second port to connect the power converter and the filter in parallel. The fourth port is used to connect to the power grid.

[0011] According to the energy storage system provided in some embodiments of the present application, multiple energy storage modules are provided, and the energy storage system also includes a main controller, which is connected to the first controller of the multiple energy storage modules. By providing multiple energy storage modules in the energy storage system, it is beneficial to increase the capacity of the battery device of the energy storage system and to improve the peak load shifting capability of the energy storage system. The main controller is connected through the first controllers of the multiple energy storage modules and can issue instructions to the first controllers of the multiple energy storage modules, so that the first controllers of each energy storage module can control the operating conditions of the energy storage module according to the instructions of the main controller.

[0012] According to the energy storage system provided in some embodiments of the present application, the filter includes a capacitor and an inductor, the capacitor is connected in parallel to the battery device, and the inductor is connected in series between the fully-controlled device and the capacitor. By connecting the capacitor in the filter in parallel with the battery device, the filter can process fluctuations or noise in the output current or input current of the battery device, which is beneficial to improving the stability and purity of the battery device. By connecting the inductor in the filter in series with the fully-controlled device and the capacitor, the inductor is connected between the capacitor and the battery device, which can smooth the pulsation or ripple in the DC voltage output or input of the battery device.

[0013] According to the energy storage system provided by some embodiments of the present application, the fully controlled device includes an insulated gate bipolar transistor.

[0014] According to the energy storage system provided in some embodiments of the present application, the filter is configured as a DC filter. By configuring the filter as a DC filter, the filter can block and short-circuit the AC signal, making the waveform more stable.

[0015] According to some embodiments of the present application, the energy storage system provides an energy storage module including at least two battery devices, which are connected in series and / or in parallel. By including at least two battery devices in the energy storage module, the energy storage module has a larger capacity, which helps improve the energy storage capacity of the energy storage module.

[0016] The technical solutions provided by the embodiments of the present disclosure bring at least the following beneficial effects:

[0017] Some embodiments of the present application provide an energy storage system, comprising an energy storage module, the energy storage module comprising a battery device, a fully-controlled device, a filter, a power converter, and a first controller. The filter is connected in parallel with the battery device via a first port, the fully-controlled device is connected between the first port and the battery device, the power converter is connected between the second port of the filter and the power grid, and the first controller is connected to the fully-controlled device and the power converter. In the above structure, since the fully-controlled device is connected between the first port of the filter and the battery device, and the first controller is connected to the fully-controlled device and the power converter, the first controller can disconnect the electrical connection between the first port and the battery device when controlling the power converter to operate in a purely reactive mode, thereby preventing the power grid from inducing a current to charge or discharge the battery device. Furthermore, the first controller can connect the first port to the battery device when controlling the power converter to operate in an active mode, thereby enabling the power grid to charge the battery device or the battery device to supply power to the power grid. Since the battery device of the energy storage system is not easily charged or discharged under purely reactive conditions, the loss of the service life of the energy storage device in the energy storage system is reduced, which is conducive to extending the service life of the energy storage device in the energy storage system.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the accompanying drawings, the same reference numerals are used to denote the same components.

[0020] Figure 1 A schematic diagram of an energy storage module in an energy storage system provided in some embodiments of the present application;

[0021] Figure 2 Schematic diagram of an energy storage system provided in some embodiments of the present application.

[0022] In the accompanying drawings: 1. Energy storage module; 11. Battery device; 111. First polarity terminal; 112. Second polarity terminal; 12. Fully controlled device; 121. Insulated gate bipolar transistor; 13. Filter; 131. Capacitor; 132. Inductor; 14. Power converter; 15. First controller; 2. Main controller. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0025] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0027] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0028] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0029] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 85°-9°, they are considered perpendicular; if the angle between two directions is 5°-5°, they are considered parallel.

[0030] The term "plurality" used in this application refers to two or more (including two).

[0031] Currently, market developments indicate that battery applications are becoming increasingly widespread. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely employed in energy storage devices such as energy storage containers and cabinets. They are also used to shift peak power and valley power in power grids to stabilize grid disturbances. As battery applications continue to expand, demands for longer battery life are growing.

[0032] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0033] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0034] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0035] Energy storage devices can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems, or temporary power supply systems. They can store electrical energy as needed and deliver it when appropriate. For example, they can store energy during low-demand periods and provide it to users or devices during peak demand periods.

[0036] The energy storage system provided in the embodiments of the present application may include one or more energy storage modules, each of which may include one or more energy storage devices and a power converter system (PCS). The power converter system may be connected between the power grid and the energy storage device. Electric energy from the power grid may be stored in the energy storage device via the power converter system, and electric energy from the energy storage device may also be transmitted to the power grid via the power converter system. The PCS enables bidirectional energy transfer between the energy storage device and the power grid.

[0037] Due to fluctuations in the power grid, energy storage systems operate in both active and reactive modes. Currently, while energy storage systems can function as reactive devices in purely reactive conditions, the capacitors in components like filters create charge and discharge currents on one side of the battery device under these conditions, shortening the battery's lifespan.

[0038] In order to extend the service life of an energy storage device in an energy storage system, some embodiments of the present application provide an energy storage system, which includes an energy storage module, the energy storage module including a battery device, a fully controlled device, a filter, a power converter and a first controller, the filter being connected in parallel with the battery device through a first port, the fully controlled device being connected between the first port and the battery device, the power converter being connected between the second port of the filter and the power grid, and the first controller being connected to the fully controlled device and the power converter. In the above structure, since the fully controlled device is connected between the first port of the filter and the battery device, and the first controller is connected to the fully controlled device and the power converter, the first controller can disconnect the electrical connection between the first port and the battery device when controlling the power converter to operate in a purely reactive mode, so that the power grid is less likely to induce a current for charging and discharging the battery device, and can also connect the first port to the battery device when controlling the power converter to operate in an active mode, so that the power grid can charge the battery device or the battery device can supply power to the power grid. Since the battery device of the energy storage system is not easily charged or discharged under pure reactive working conditions, the loss of the service life of the energy storage device in the energy storage system is reduced, which is conducive to extending the service life of the energy storage device in the energy storage system.

[0039] The energy storage system provided in the embodiments of the present application can be connected to the power grid to store electricity during low-consumption periods and provide electricity to relevant users or electrical equipment during peak periods. It can also be connected to power generation equipment, and the electricity generated by the power generation equipment can be stored in the energy storage device. As an example, the power generation equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc.

[0040] Some embodiments of the present application provide a Figure 1 The energy storage system shown includes an energy storage module 1, which includes a battery device 11, a fully-controlled device 12, a filter 13, a power converter 14 and a first controller 15. The filter 13 includes a first port and a second port. The filter 13 is connected in parallel with the battery device 11 through the first port. The fully-controlled device 12 is connected between the first port and the battery device 11. The power converter 14 is connected between the second port and the power grid. The first controller 15 is connected to the fully-controlled device 12 and the power converter 14.

[0041] The battery device 11 can be a device capable of storing electrical energy and can include one or more battery packs, each of which can include one or more battery cell assemblies. As an example, a battery pack includes a housing and one or more battery cell assemblies, which are housed in the housing, for example, by a fixed arrangement. As another example, the battery device 11 can include multiple battery packs, which can be connected in series, in parallel, or in a hybrid arrangement.

[0042] The fully-controlled device 12 can be a power electronic device that can be controlled to both conduct and shut down by a control signal. By connecting the fully-controlled device 12 between the filter 13 and the battery device 11, the fully-controlled device 12 can disconnect the filter 13 from the battery device 11 under the control of the control signal, allowing the battery device 11 to controllably disconnect from other devices. This allows the battery device 11 to be disconnected from other devices under appropriate operating conditions, disconnecting the battery device 11 from the power grid under purely reactive operating conditions, thereby reducing the occurrence of charging and discharging.

[0043] Filter 13 can be used to improve the stability and purity of battery device 11. It is a passive bidirectional network with a bidirectional port. The first port and the second port are ports of filter 13. The first port is the port for filter 13 to electrically connect to battery device 11, and the second port is the port for filter 13 to electrically connect to the power grid. The first port can have two terminals for electrically connecting to battery device 11. The second port can also have two terminals for electrically connecting to power converter 14.

[0044] The power converter 14 can convert one type of current into another type of current. The power converter 14 is connected between the second port of the filter 13 and the power grid and is used to control the operating conditions of the energy storage module 1. Under the action of the power converter 14, the energy storage module 1 can operate in purely reactive conditions, purely active conditions, and can also achieve bidirectional regulation between partially active conditions and partially reactive conditions.

[0045] The first controller 15 can be a controller for controlling the operating conditions of the power converter, and can also be used to control the conduction or disconnection of the fully-controlled device 12. By connecting the first controller 15 to the power converter 14 and the fully-controlled device 12 at the same time, the first controller 15 can control the conduction or disconnection of the fully-controlled device 12 while controlling the power converter 14 in a certain operating state. This allows the first controller 15 to disconnect the electrical connection between the filter 13 and the battery device 11 when controlling the power converter 14 to operate in a purely reactive state, making it less likely that the power grid will induce current to charge and discharge the battery device 11, thereby reducing the loss of the battery device 11's service life.

[0046] In the above structure, since a fully-controlled device 12 is connected between the first port of the filter 13 and the battery device 11, and the first controller 15 is connected to the fully-controlled device 12 and the power converter 14, the first controller 15 can disconnect the electrical connection between the first port and the battery device 11 when controlling the power converter 14 to operate in a purely reactive mode, thereby preventing the power grid from inducing a current to charge or discharge the battery device 11. Furthermore, when controlling the power converter 14 to operate in an active mode, the first controller 15 can connect the first port to the battery device 11, thereby enabling the power grid to charge the battery device 11 or the battery device 11 to supply power to the power grid. Since the battery device 11 of the energy storage system is not easily charged or discharged under purely reactive conditions, the loss of service life of the energy storage device in the energy storage system is reduced, thereby facilitating the extension of the service life of the energy storage device in the energy storage system.

[0047] In some embodiments, the fully-controlled device 12 includes a bidirectional fully-controlled device 12 .

[0048] The bidirectional fully-controlled device 12 may be a fully-controlled device 12 that allows current to flow in both the forward and reverse directions when the control signal is turned on. By including the bidirectional fully-controlled device 12, when the fully-controlled device 12 is turned on, the power grid can both charge the battery device 11 and the battery device 11 can supply power to the power grid, enabling the energy storage module 1 to perform active peak load shifting for the power grid.

[0049] In some embodiments, the fully-controlled device 12 includes two unidirectional fully-controlled devices 12 , which are connected in parallel and have opposite conduction directions.

[0050] The unidirectional fully-controlled device 12 may refer to a fully-controlled device 12 that can only allow current to pass in the forward direction or only allow current to pass in the reverse direction when the control signal is turned on. By making the fully-controlled device 12 include two unidirectional fully-controlled devices 12, and the two unidirectional fully-controlled devices 12 are arranged in parallel with opposite conduction directions, both forward and reverse currents can flow between the filter 13 and the battery device 11. When the fully-controlled device 12 is turned on, the power grid can charge the battery device 11, and the battery device 11 can also supply power to the power grid, so that the energy storage module 1 can perform active peak-shaving and valley-filling for the power grid.

[0051] In some embodiments, the battery device 11 includes a first polarity terminal 111 and a second polarity terminal 112 with opposite polarities, and the fully controlled device 12 is connected between the first polarity terminal 111 and the first port or between the second polarity terminal 112 and the first port.

[0052] The first polarity terminal 111 and the second polarity terminal 112 may be two connection terminals with opposite polarities in the battery device 11, which can be used not only to transmit electrical energy to the outside world but also to charge the battery device 11. The fully-controlled device 12 is connected between the first polarity terminal 111 and the first port. Specifically, the fully-controlled device 12 may be connected between the first polarity terminal 111 and a terminal in the first port for connecting to the first polarity terminal 111, so that the fully-controlled device 12 can disconnect the electrical connection between the battery device 11 and the filter 13 by disconnecting the electrical connection between the first polarity terminal 111 and the terminal in the first port.

[0053] The fully-controlled device 12 is connected between the second polarity terminal 112 and the first port. It can be that the fully-controlled device 12 is connected between the second polarity terminal 112 and the wiring terminal in the first port for connecting to the second polarity terminal 112, so that the fully-controlled device 12 can disconnect the electrical connection between the battery device 11 and the filter 13 by disconnecting the electrical connection between the second polarity terminal 112 and the wiring terminal in the first port.

[0054] In some embodiments, the power converter 14 includes a third port and a fourth port. The third port is connected to the second port to connect the power converter 14 and the filter 13 in parallel. The fourth port is used to connect to the power grid.

[0055] The third and fourth ports are ports of power converter 14. The third port is used by power converter 14 to electrically connect to filter 13, and the fourth port is used by power converter 14 to connect to the power grid. The third port may be provided with two terminals for electrically connecting to filter 13. The fourth port may be provided with terminals for connecting to the power grid.

[0056] In some embodiments, reference Figure 2 There are multiple energy storage modules 1 , and the energy storage system further includes a main controller 2 , which is connected to the first controller 15 in the multiple energy storage modules 1 .

[0057] The energy storage module 1 is provided with multiple, which may mean that there are two or more energy storage modules 1. By providing multiple energy storage modules 1 in the energy storage system, the capacity of the battery device 11 in the energy storage system is improved, and the peak shaving and valley filling capability of the energy storage system is improved.

[0058] The main controller 2 may be a controller for controlling the operating conditions of each energy storage module 1 in the energy storage system. The main controller 2 is connected via the first controllers 15 in the multiple energy storage modules 1 and can issue instructions to the first controllers 15 in the multiple energy storage modules 1, so that the first controllers 15 in each energy storage module 1 can control the operating conditions of the energy storage modules 1 according to the instructions of the main controller 2.

[0059] In some embodiments, the filter 13 includes a capacitor 131 and an inductor 132 . The capacitor 131 is connected in parallel to the battery device 11 , and the inductor 132 is connected in series between the fully-controlled device 12 and the capacitor 131 .

[0060] Capacitor 131 and inductor 132 are both electronic components in filter 13. By connecting capacitor 131 in filter 13 in parallel with battery device 11, filter 13 can process fluctuations or noise in the output or input current of battery device 11, thereby improving the stability and purity of battery device 11. By connecting inductor 132 in filter 13 in series with fully-controlled device 12 and capacitor 131, so that inductor 132 is connected between capacitor 131 and battery device 11, it can smooth out ripples or pulses in the DC voltage output or input of battery device 11.

[0061] In some embodiments, the fully-controlled device 12 includes an insulated gate bipolar transistor 121 .

[0062] The insulated gate bipolar transistor 121 combines the advantages of a power transistor and a power field effect transistor and has good characteristics.

[0063] There are two insulated gate bipolar transistors 121 in the fully-controlled device 12. The two insulated gate bipolar transistors 121 are connected in parallel and are arranged in opposite conduction directions. When the fully-controlled device 12 is turned on, the power grid can charge the battery device 11 and the battery device 11 can supply power to the power grid, so that the energy storage module 1 can perform active peak shaving and valley filling for the power grid.

[0064] In some embodiments, the filter 13 is configured as a DC filter 13 .

[0065] By configuring filter 13 as a DC filter, filter 13 can block and short-circuit AC signals, making the waveform smoother. By connecting capacitors 131 in series, the withstand voltage can be increased, and by connecting capacitors 131 in parallel, the capacity can be increased, making the output DC more stable, which helps improve the operating stability of battery device 11.

[0066] In some embodiments, the energy storage module 1 includes at least two battery devices 11 , and the at least two battery devices 11 are connected in series and / or in parallel.

[0067] At least two battery devices 11 are connected in series and / or in parallel, which may mean that at least two battery devices 11 are connected in series, at least two battery devices 11 are connected in parallel, or at least two battery devices 11 are connected both in series and in parallel so that the at least two battery devices 11 are electrically connected as a whole to output or store electrical energy.

[0068] By making the energy storage module 1 include at least two battery devices 11 , the energy storage module 1 has a larger capacity, which is beneficial to improving the energy storage capacity of the energy storage module 1 .

[0069] Some embodiments of the present application provide an energy storage system, which includes a main controller 2 and multiple energy storage modules 1, the energy storage module 1 including a battery device 11, a fully-controlled device 12, a filter 13, a power converter 14 and a first controller 15, the main controller 2 is connected to the first controller 15 among the multiple energy storage modules 1, the filter 13 is connected in parallel with the battery device 11 through a first port, the fully-controlled device 12 is connected between the first polarity terminal 111 and the first port of the battery device 11, the power converter 14 is connected in parallel with the filter 13 through the connection of the third port to the second port, the fourth port of the power converter 14 is used to be connected to the power grid, and the first controller 15 is connected to the fully-controlled device 12 and the power converter 14. In the above structure, since a fully-controlled device 12 is connected between the first port of the filter 13 and the battery device 11, and the first controller 15 is connected to the fully-controlled device 12 and the power converter 14, the first controller 15 can disconnect the electrical connection between the first port and the battery device 11 when controlling the power converter 14 to operate in a purely reactive mode, thereby preventing the power grid from inducing a current to charge or discharge the battery device 11. Furthermore, when controlling the power converter 14 to operate in an active mode, the first controller 15 can connect the first port to the battery device 11, thereby enabling the power grid to charge the battery device 11 or the battery device 11 to supply power to the power grid. Since the battery device 11 of the energy storage system is not easily charged or discharged under purely reactive conditions, the loss of service life of the energy storage device in the energy storage system is reduced, thereby facilitating the extension of the service life of the energy storage device in the energy storage system.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. 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 application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An energy storage system, characterized in that: The energy storage module includes a battery device, a fully-controlled device, a filter, a power converter and a first controller. The filter includes a first port and a second port. The filter is connected in parallel with the battery device through the first port. The fully-controlled device is connected between the first port and the battery device. The power converter is connected between the second port and the power grid. The first controller is connected to the fully-controlled device and the power converter.

2. The energy storage system according to claim 1, characterized in that The fully-controlled device includes a bidirectional fully-controlled device.

3. The energy storage system according to claim 1, characterized in that The fully-controlled device includes two unidirectional fully-controlled devices, which are connected in parallel and have opposite conduction directions.

4. The energy storage system according to claim 1, characterized in that The battery device includes a first polarity terminal and a second polarity terminal with opposite polarities, and the fully controlled device is connected between the first polarity terminal and the first port or between the second polarity terminal and the first port.

5. The energy storage system according to claim 1, characterized in that: The power converter includes a third port and a fourth port. The third port is connected to the second port so that the power converter is connected in parallel with the filter. The fourth port is used to be connected to the power grid.

6. The energy storage system according to claim 5, characterized in that: There are multiple energy storage modules, and the energy storage system further includes a main controller connected to the first controllers in the multiple energy storage modules.

7. The energy storage system according to claim 4, characterized in that: The filter includes a capacitor and an inductor, wherein the capacitor is connected in parallel to the battery device, and the inductor is connected in series between the fully-controlled device and the capacitor.

8. The energy storage system according to claim 1, characterized in that: The fully controlled device includes an insulated gate bipolar transistor.

9. The energy storage system according to claim 1, characterized in that: The filter is configured as a DC filter.

10. The energy storage system according to claim 1, characterized in that: The energy storage module includes at least two battery devices, and the at least two battery devices are connected in series and / or in parallel.

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