Energy storage sub-module and energy storage system

Abstract

The utility model discloses an energy storage sub-module and an energy storage system, the energy storage sub-module comprises a first power module, a first energy storage module and at least one second energy storage module, the first energy storage module comprises a first DC interface and a first energy storage assembly, the output end of the first power module is connected with a first connecting assembly, and the output end of the first power module is connected with a second connecting assembly; one end of the first direct-current interface is connected with the first connecting assembly; the second energy storage module comprises a second direct-current interface and a second energy storage assembly, one end of the second direct-current interface is connected with the second connecting assembly, and the other end of the second direct-current interface is connected with the other end of the first direct-current interface of the first energy storage module; the input end of the first power module is used for being connected with other energy storage sub-modules in the energy storage system, and the power of the first power module is larger than that of the first energy storage assembly. In this way, in the energy storage sub-module, the capacity of the container type energy storage sub-module can be increased, the economical efficiency of container type energy storage can be improved, and then the availability rate of the energy storage system is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of battery energy storage, and in particular to an energy storage submodule and an energy storage system. Background Art

[0002] With the development of smart grids, energy storage technology has become a crucial component of this evolution. Among various energy storage technologies, containerized energy storage systems offer advantages such as mature technology, large capacity, portability, high reliability, zero pollution, low noise, strong adaptability, scalability, and ease of installation. Therefore, as a power source for power systems, containerized energy storage systems are the future direction of energy storage development.

[0003] In the related art, for the current container-type energy storage system, the capacity of the container-type energy storage system is relatively low, which reduces the system availability. Utility Model Content

[0004] The utility model provides an energy storage submodule and an energy storage system, which can increase the capacity of the container-type energy storage submodule, facilitate the expansion of container energy storage, and further improve the availability of the energy storage system.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] In a first aspect, an embodiment of the present utility model provides an energy storage submodule, which includes a first power module, a first energy storage module, and at least one second energy storage module, wherein:

[0007] The first energy storage module includes a first DC interface and a first energy storage assembly, the first energy storage assembly includes multiple energy storage units, and the multiple energy storage units are connected via a first connecting assembly; the output end of the first power module is connected to the first connecting assembly, and one end of the first DC interface is connected to the first connecting assembly;

[0008] The second energy storage module includes a second DC interface and a second energy storage assembly, the second energy storage assembly includes multiple energy storage units, and the multiple energy storage units are connected via a second connecting assembly; one end of the second DC interface is connected to the second connecting assembly, and the other end of the second DC interface is connected to the other end of the first DC interface of the first energy storage module;

[0009] The input end of the first power module is used to connect to other energy storage sub-modules in the energy storage system, and the power of the first power module is greater than the power of the first energy storage component.

[0010] Through the above technical means, since the energy storage submodule adopts a modular solution, for example, a first energy storage module and at least one second energy storage module, the first energy storage module includes a first energy storage assembly composed of multiple energy storage units, and the second energy storage module includes a second energy storage assembly composed of multiple energy storage units, and in the energy storage system, the input end of the first power module is cascaded with other energy storage submodules; in this way, by connecting the energy storage assemblies in these energy storage modules, and the power of the first power module is greater than the power of the first energy storage assembly, the first power module can cover the capacity required by the energy storage assemblies in these energy storage modules, thereby increasing the capacity of the energy storage submodule; taking the modularization in the form of a container as an example, it is also conducive to expanding the container energy storage, and the expansion method is simple. Only by connecting the first energy storage assembly with at least one second energy storage assembly can the container energy storage be expanded, thereby solving the problem of small capacity and difficulty in expansion of DC direct-hung energy storage valves in related technologies; in addition, since the circuit structure of this modular solution is simple, while increasing capacity, it can also avoid additional system costs, thereby improving the economy of container-type energy storage.

[0011] In some embodiments, the first power module is located in the first energy storage module, wherein: the first energy storage module also includes a power interface, one end of the power interface is connected to the input end of the first power module, and the other end of the power interface is used to connect to other energy storage sub-modules in the energy storage system.

[0012] Through the above technical means, the first power module is located within the first energy storage module, which not only saves space but also realizes the unified setting of the energy storage modules, thereby increasing capacity while avoiding additional system costs, thereby improving the economic efficiency of containerized energy storage.

[0013] In some embodiments, the first energy storage component and the at least one second energy storage component are respectively connected in parallel to the output end of the first power module.

[0014] Through the above-mentioned technical means, in this energy storage submodule, the first energy storage component is connected in parallel with at least one second energy storage component. By connecting multiple energy storage components in parallel, the current is increased, and the capacity of the container-type energy storage submodule is increased, which is conducive to expanding the container energy storage capacity. Moreover, based on this parallel expansion implementation method, the problem of small capacity of DC direct-mounted energy storage valves in related technologies is solved, while also improving the economic efficiency of container-type energy storage.

[0015] In some embodiments, the first energy storage component is connected in series with at least one second energy storage component, and the series-connected first energy storage component and at least one second energy storage component are connected to the output end of the first power module.

[0016] Through the above-mentioned technical means, in this energy storage submodule, the first energy storage component is connected in series with at least one second energy storage component. By connecting multiple energy storage components in series, the voltage is increased, and the capacity of the container-type energy storage submodule is increased, which is conducive to expanding the container energy storage capacity. Moreover, based on this series expansion implementation method, the problem of small capacity of DC direct-mounted energy storage valves in related technologies is solved, while at the same time improving the economic efficiency of container-type energy storage.

[0017] In some embodiments, the first energy storage module and the second energy storage module have the same size and both meet preset size specifications.

[0018] Through the above technical means, the first energy storage module and the second energy storage module both use containers of preset size specifications, which not only reduces costs but also facilitates transportation. Especially when sea transportation is involved, for containers of preset size specifications, both transportation convenience and economy can be taken into account.

[0019] In some embodiments, the housing of the first energy storage module and the housing of the second energy storage module are at the same potential.

[0020] Through the above technical means, the outer shell of the first energy storage module and the outer shell of the second energy storage module have the same potential, and the potential matches the voltage of the energy storage submodule. In this way, the environmental voltage of the energy storage components in the first energy storage module and the second energy storage module is uniform, reducing the discharge risk of the same energy storage submodule in different energy storage modules.

[0021] In some embodiments, the first power module includes a first bypass switch, a first power unit and a first switch unit, wherein: the first bypass switch is connected in parallel to the input end of the first power unit; the output end of the first power unit is connected to the first connection component and at least one second connection component through the first switch unit.

[0022] Through the above technical means, the first bypass switch is connected in parallel to the input end of the first power unit. When the first power module fails, the first bypass switch can be closed to bypass the first power module, thereby improving the reliability of the energy storage submodule. Moreover, the first switch unit is used to control the path between the output end of the first power unit and the first connecting component and the at least one second connecting component, so that the first switch unit can control the charge and discharge of the first energy storage component and the at least one second energy storage component. In this way, the first power unit can control the charge and discharge of the first energy storage component and the at least one second energy storage component (for example, charge and discharge input or output function) according to the closing and opening of the first switch unit, and the charge and discharge efficiency is also improved.

[0023] In some embodiments, the first switch unit includes a first positive-side switch and / or a first negative-side switch; wherein the first positive-side switch and the first negative-side switch are configured to operate independently, or the first negative-side switch is configured to be in a closed state.

[0024] Through the above technical means, when the first switch unit includes a first positive-side switch and a first negative-side switch, the first positive-side switch and the first negative-side switch can be configured to operate independently, or the first negative-side switch can be configured to be in a closed state. In this way, since the first positive-side switch and the first negative-side switch can be configured to operate independently, or the first negative-side switch can be configured to be always in a closed state, different operating modes can be covered, thereby enabling the first power unit to control the charging and discharging of the first energy storage component and the second energy storage component (for example, the charging and discharging input or output function), thereby improving the charging and discharging efficiency.

[0025] In some embodiments, when the number of second energy storage modules is one, the first energy storage module and the second energy storage module are placed back to back; a first opening is provided on the back side of the first energy storage module, and a second opening is provided on the back side of the second energy storage module, and a connecting component for connecting the first DC interface and the second DC interface passes through the first opening and the second opening.

[0026] Through the above technical means, since the first energy storage module and the second energy storage module are placed back to back, not only can the placement space be saved, but the connecting components between the first DC interface and the second DC interface can also be shortened, reducing the loss of the connecting components. At the same time, the back-to-back arrangement of the two energy storage modules can also facilitate personnel to maintain and manage the two energy storage modules.

[0027] In some embodiments, the connection component includes at least one of the following: a high-voltage cable, a DC busbar, and a laminated busbar.

[0028] Through the above technical means, taking into account the insulation characteristics, the connection components between the first energy storage module and the second energy storage module can be implemented by, including but not limited to, high-voltage cables, wall bushings combined with DC busbars or folded laminated busbars, thereby improving safety.

[0029] In some embodiments, the energy storage submodule also includes a second power module, and the second power module is located in the second energy storage module, wherein: the input end of the first power module is connected to the input end of the second power module; the output end of the second power module is connected to the second connection component and the first connection component through the second switch unit.

[0030] Through the above-mentioned technical means, the first energy storage module and the second energy storage module both include a power module and an energy storage assembly, and the multiple energy storage units in each energy storage assembly are connected via corresponding connecting assemblies. A single power module can also cover the capacity required by the energy storage assemblies in the two energy storage modules, such as the capacity required by the first energy storage assembly and the second energy storage assembly. In this way, by connecting the energy storage assemblies in the first energy storage module and the second energy storage module, the capacity of the container-type energy storage submodule can be increased, which is conducive to the expansion of container energy storage, thereby solving the problem of small capacity of DC direct-hung energy storage valves in related technologies. At the same time, the first power module and the second power module can also be redundant with each other, thereby increasing the redundancy rate within the energy storage submodule and thereby improving the reliability of the energy storage submodule.

[0031] In some embodiments, the energy storage submodule further includes a third energy storage module, wherein: the third energy storage module includes a third power module and a third energy storage assembly, the third energy storage assembly includes a plurality of energy storage units, and the plurality of energy storage units are connected via a third connecting assembly; and the output end of the third power module is connected to the third connecting assembly and at least one second connecting assembly.

[0032] Through the above-mentioned technical means, the first energy storage module and the third energy storage module can share the second energy storage component in the second energy storage module. For example, the first energy storage component and at least one second energy storage component can be controlled to charge and discharge by the first power module, or the third energy storage component and at least one second energy storage component can be controlled to charge and discharge by the third power module. In this way, based on the connection between the first connecting component and the at least one second connecting component, the connection between the first energy storage component and the at least one second energy storage component can be achieved; or, based on the connection between the third connecting component and the at least one second connecting component, the connection between the third energy storage component and the at least one second energy storage component can be achieved. In this way, the capacity of the container-type energy storage sub-module can be increased, solving the problem of small capacity of the DC direct-hung energy storage valve in the related art. At the same time, the first power module and the third power module can also be redundant with each other, thereby further improving the reliability of the energy storage sub-module.

[0033] In a second aspect, an embodiment of the present invention provides an energy storage system, which includes at least two energy storage sub-modules as described in any one of the first aspects.

[0034] Through the above technical means, since the energy storage submodules in the energy storage system adopt a modular solution, for example, the first energy storage module includes a first energy storage component composed of multiple energy storage units, and the second energy storage module includes a second energy storage component composed of multiple energy storage units, and the input end of the first power module in the energy storage system is cascaded with other energy storage submodules; in this way, by connecting the energy storage components in these energy storage modules, and at the same time, the power of the first power module is greater than the power of the first energy storage component, the capacity of the energy storage submodule can be increased; taking the modularization in the form of a container as an example, it is also conducive to the expansion of container energy storage, and The capacity expansion method is simple. The capacity expansion of container energy storage can be achieved by simply connecting the first energy storage component with at least one second energy storage component, thereby solving the problem of small capacity and difficulty in capacity expansion of DC direct-mounted energy storage valves in related technologies. At the same time, the circuit structure of this modular solution is simple, which can avoid additional system costs while increasing capacity, thereby improving the economy of container-type energy storage. In particular, these energy storage modules adopt preset size specifications, which can reduce costs while facilitating transportation, especially in the case of sea transportation, thereby taking into account both transportation convenience and economy, and further improving the availability of the energy storage system.

[0035] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of an energy storage system;

[0037] Figure 2 This is a schematic diagram of the topological structure of a DC direct-hung energy storage valve;

[0038] Figure 3 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 1 ;

[0039] Figure 4 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 2 ;

[0040] Figure 5 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 3 ;

[0041] Figure 6 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 4 ;

[0042] Figure 7 Schematic diagram of an application scenario of an energy storage submodule provided by an embodiment of the utility model Figure 1 ;

[0043] Figure 8 Schematic diagram of an application scenario of an energy storage submodule provided by an embodiment of the utility model Figure 2 ;

[0044] Figure 9 Schematic diagram of an application scenario of an energy storage submodule provided by an embodiment of the utility model Figure 3 ;

[0045] Figure 10 Schematic diagram of an application scenario of an energy storage submodule provided by an embodiment of the utility model Figure 4 ;

[0046] Figure 11 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 5 ;

[0047] Figure 12 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 6 ;

[0048] Figure 13 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 7 ;

[0049] Figure 14 A schematic diagram of the structure of an energy storage submodule provided in an embodiment of the utility model Figure 8 ;

[0050] Figure 15 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0051] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0053] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0054] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present invention described here can be implemented in an order other than that illustrated or described here.

[0055] In addition, references to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of such phrases 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. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] The following is an introduction to the related technologies of the present invention.

[0057] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0058] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0059] In an embodiment of the present invention, the battery includes at least one battery cell. A battery cell refers to a basic unit that can realize the mutual conversion of chemical energy and electrical energy, and can be used to make a battery module or battery pack, thereby being used to supply power to an electrical device. The battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after the battery cell is discharged and can continue to be used. The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited here.

[0060] In the embodiments of the present invention, the battery may include only one battery cell, or the battery may be a single physical module including multiple battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in hybrid via a busbar.

[0061] Furthermore, with the widespread application of batteries in energy storage, the use of high-power power electronic devices is becoming increasingly widespread. For example, high-voltage energy storage devices typically include a high-voltage converter valve and a high-voltage energy storage valve. The high-voltage converter valve converts AC power into DC power, while the high-voltage energy storage valve delivers power and stores energy.

[0062] In the related art, existing direct-mounted DC energy storage valves are based on an indoor valve hall layout, and the energy storage submodules utilize steel frames, resulting in relatively high overall structural costs. As a possible improvement, containers can be used as the module frame and housing. This would reduce the cost of the submodules and energy storage valve components, and the container solution is also suitable for outdoor deployment of direct-mounted DC energy storage valves. Therefore, the development of containerized energy storage submodules is of great significance to the promotion of direct-mounted DC energy storage valves. However, current direct-mounted containerized modules suffer from low capacity and insufficient economic efficiency.

[0063] In one possible implementation, for the current container-type energy storage solution, a large amount of insulation distance is obviously left in the direct-mounted energy storage container, and it does not focus on expanding the economic efficiency of direct-mounted container energy storage, that is, it does not improve the economic efficiency of container energy storage.

[0064] In another possible implementation, for the current power module redundancy solution in the direct-mounted energy storage system, such as Figure 1As shown, there are n battery modules and corresponding multiple power modules, where n is a positive integer. For n battery modules (BAT1, BAT2, ..., BATn), taking one of the battery modules (e.g., BAT1) as an example, capacitor C11 and power devices T11 and T12 constitute the main power module, capacitor C12 and power devices T13 and T14 constitute the redundant power module, the first bypass switch S13 is connected in parallel at both ends of the power device T12, and the second bypass switch S16 is connected in parallel at both ends of the power device T14. Both the main power module and the redundant power module here can be used to charge and discharge the first battery module BAT1. In other words, by setting a power module greater than the number of battery modules, when the main power module fails, the redundant power module can take over the main power module to control the battery module. Due to the focus on power module redundancy, the number of power modules exceeds the number of battery modules. However, when applied to container scenarios, this design cannot achieve a unified container design. Secondly, this design focuses on power module redundancy, and a single power module still only carries one battery module, which cannot increase the submodule capacity. In addition, the battery modules are connected via a busbar to prevent battery failure due to over-discharge, but this busbar design is not conducive to insulation design, resulting in reduced system safety. Simply put, the current high-voltage direct-mount energy storage submodule has a low system capacity due to insulation design requirements. In addition, the submodule voltage level in the container-type DC direct-mount energy storage valve design is too low, making the system cost of the container-type DC direct-mount energy storage valve too high.

[0065] For example, Figure 2 This is a schematic diagram of the topological structure of a DC direct-hung energy storage valve. Figure 2 As shown in (a), the DC direct-hung energy storage valve includes a first inductor L1 and m energy storage sub-modules. The m energy storage sub-modules are cascaded and connected in series with the first inductor L1. The m energy storage sub-modules are represented by SM1#1, SM1#2, SM1#3, SM1#4, ..., SM1#m, respectively, where m is a positive integer.

[0066] For each energy storage submodule, it can include two power devices (such as T11 and T12), a bypass switch K, a capacitor C and a battery module BAT. The bypass switch K is connected in parallel at both ends of the power device T12. The specific circuit structure is as follows: Figure 2 As shown in (b) in .

[0067] Because the DC direct-mount energy storage valve's topology utilizes a cascade of submodules, and each submodule has an equal chance of being activated or deactivated during operation, the internal potential of the submodule is typically considered the system potential during insulation coordination design. For example, for a ±35kV or ±10kV DC direct-mount energy storage valve, the internal potential of the submodule is considered to be 35kV or 10kV, respectively. Since outdoor containers are typically placed outdoors at ground potential, the air clearance between the internal working components of the container-type submodule and the container wall must be designed according to the system voltage (e.g., 35kV / 10kV). This significantly limits the full utilization of the container's internal space, especially when considering high-altitude applications.

[0068] That is to say, due to the insulation design requirements that limit the space usage inside the container, and the low system voltage of the container DC direct-mounted energy storage valve (e.g., ±10 to ±15 kV), the system capacity is relatively low. For example, when the energy storage valve bridge arm current is 2000 A, the system capacity of the energy storage valve can be calculated to be 40 MW to 60 MW. The energy storage system faces the following problems when designing: On the one hand, due to the small available space inside a single container (for example, for a 10kVac system, considering an altitude of 4000 meters, the air clearance is 187mm), less than 4MWh battery modules can be installed inside a single container. Considering that the charging rate of the energy storage battery is generally 0.5C, in order to achieve a current of 2000A for the energy storage valve bridge arm, the voltage of a single submodule needs to be reduced to below 1kV. At this time, in order to meet the system voltage of the energy storage valve, the number of submodules connected in series will increase, resulting in too many auxiliary components (such as connecting busbars, optical fibers, etc.) required for each watt-hour (Wh) of effective energy storage capacity, thereby increasing the cost of auxiliary components; on the other hand, for similar reasons, if the voltage of each submodule is set to a nominal 1.5kV or higher, the current of the energy storage valve bridge arm will be low, such as about 1500A corresponding to a submodule voltage of 1.5kV; on the other hand, if the Figure 2 If the DC direct-mounted energy storage valves are connected in parallel to expand the capacity, there may be slight differences in voltage and current between the systems. When the systems are connected in parallel, circulating currents and harmonics may exist, which can easily cause uncontrollable resonance or oscillation. In other words, resonance or oscillation may occur between the parallel energy storage valves.

[0069] Based on this, an embodiment of the present invention provides an energy storage submodule and an energy storage system, which adopts a modular solution. For example, the first energy storage module includes a first energy storage component composed of multiple energy storage units, and the second energy storage module includes a second energy storage component composed of multiple energy storage units. In addition, the first power module can also cover the capacity required by the energy storage components in these energy storage modules. Thus, taking the modularization in the form of a container as an example, by connecting the energy storage components in these energy storage modules, not only can the capacity of the container-type energy storage submodule be increased, but the expansion method is simple, thereby solving the problem of small capacity and difficulty in expansion of DC direct-hung energy storage valves in the related art. In addition, the circuit structure of this modular solution is simple, which can avoid additional system costs while increasing capacity, and also improve the economy of container-type energy storage. In particular, these containers adopt preset size specifications, which can reduce costs while facilitating transportation. Especially when it comes to sea transportation, for energy storage modules with preset size specifications, it can take into account both transportation convenience and economy, thereby also improving the availability of the energy storage system.

[0070] The following describes various embodiments of the present invention in detail with reference to the accompanying drawings.

[0071] In one embodiment of the present invention, Figure 3 This is a schematic diagram of the structure of an energy storage submodule provided by an embodiment of the present utility model. Figure 3 As shown, the energy storage submodule 30 may include a first power module 311, a first energy storage module 31 and at least one second energy storage module 32, wherein:

[0072] The first energy storage module 31 includes a first DC interface P1 and a first energy storage assembly 312. The output end of the first power module 311 is connected to the first energy storage assembly 312, and one end of the first DC interface P1 is connected to the first energy storage assembly 312. In an embodiment of the present invention, the first energy storage assembly 312 may include multiple energy storage units, which are connected via a first connecting assembly. Thus, the output end of the first power module 311 is connected to the first connecting assembly in the first energy storage assembly 312, and one end of the first DC interface P1 is connected to the first connecting assembly in the first energy storage assembly 312.

[0073] The second energy storage module 32 includes a second DC interface P2 and a second energy storage assembly 321. One end of the second DC interface P2 is connected to the second energy storage assembly 321, and the other end of the second DC interface P2 is connected to the other end of the first DC interface P1 of the first energy storage module 31. In this embodiment of the present invention, the second energy storage assembly 321 may include multiple energy storage units, which are connected via a second connecting assembly. Thus, one end of the second DC interface P2 is connected to the second connecting assembly in the second energy storage assembly 321, and the other end of the second DC interface P2 is connected to the other end of the first DC interface P1.

[0074] The input end of the first power module 311 is used to connect to other energy storage sub-modules in the energy storage system, and the power of the first power module 311 is greater than the power of the first energy storage component 312 .

[0075] In the embodiment of the present invention, the first power module 311 can be used to control the charging and discharging of the first energy storage component 312 and the at least one second energy storage component 321 .

[0076] In the embodiment of the present invention, the energy storage submodule 30 is a valve module that serves as an energy storage device. "Valve module" is a proprietary term in the power industry, similar to a valve switch, which mainly controls the flow of energy to achieve valve switching or energy flow regulation functions under different working conditions.

[0077] In the embodiment of the present invention, for the energy storage submodule 30, the number of the first energy storage module 31 can be one, and the number of the second energy storage modules 32 can be q, where q is a positive integer. Figure 3 The example in which the number of the second energy storage module 32 is one is only schematically provided, but the present invention is not limited thereto.

[0078] In this embodiment of the present invention, the number of second energy storage modules 32 is consistent with the number of connected second energy storage assemblies 321. Specifically, when the number of second energy storage modules 32 can be q, the first energy storage assembly 312 is connected to q second energy storage assemblies 321, respectively. Here, the first power module 311 is capable of providing the energy required by the first energy storage assembly 312 and at least one second energy storage assembly 321. In other words, the maximum number of second energy storage assemblies 321 is limited by the energy that can be provided by the first power module 311, avoiding the situation where the first power module 311 cannot cover the capacity required by the energy storage assemblies in these energy storage modules.

[0079] For example, taking the energy storage submodule 30 including the first energy storage module 31 and the second energy storage module 32 as an example, if the capacity required by the energy storage system is relatively low, the first energy storage module 31 can be directly used as the energy storage submodule; if the capacity required by the energy storage system is large, resulting in the first energy storage module 31 being unable to provide sufficient bridge arm current alone, the first energy storage component 312 in the first energy storage module 31 can be connected to the second energy storage component 321 in the second energy storage module 32, thereby not only increasing the sufficient bridge arm current so that the first power module 311 can control the first energy storage component 312 and the second energy storage component 321 to charge and discharge, but also increasing the capacity of the energy storage submodule 30, which is conducive to capacity expansion.

[0080] In the embodiment of the present invention, for the first energy storage assembly 312 and the second energy storage assembly 321, each energy storage assembly can be a module composed of multiple connected energy storage units. The energy storage assembly here can be a battery cluster or an electrical box. In addition, for the first connection assembly or the second connection assembly, multiple energy storage units can be connected together in series or parallel, and the connection assembly can be in the form of a bus bar, a high-voltage cable, etc., without any limitation.

[0081] In some embodiments, the first power module 311 is located in the first energy storage module 31. Figure 4 As shown, the first energy storage module 31 further includes a power interface P3, one end of the power interface P3 is connected to the input end of the first power module 311, and the other end of the power interface P3 is used to connect to other energy storage sub-modules in the energy storage system.

[0082] In the embodiments of the present invention, the energy storage system herein can be applied to high-voltage energy storage scenarios. In this field, the concepts of high voltage and low voltage are relative. For example, if the voltage of the device to the ground is 1000V or less, it can be called low voltage; if the voltage of the device to the ground is above 1000V, it can be called high voltage. Here, high voltage can be simply referred to as "high voltage", which generally refers to bus voltage, battery voltage, etc. above 1000V, and no limitation is made here.

[0083] In the embodiment of the present invention, the energy storage system may include multiple energy storage submodules, and the structure of each energy storage submodule is as follows: Figure 3 and Figure 4 For example, taking one of the energy storage submodules (energy storage submodule 30) as an example, in the energy storage submodule 30, the first power module 311 is located inside the first energy storage module 31, and the input end of the first power module 311 is cascaded with other energy storage submodules in the energy storage system through the power interface P3, so that it can be applied to the DC direct-hung energy storage valve scenario.

[0084] Thus, in the embodiment of the present invention, since the first power module 311 is located inside the first energy storage module 31, not only can space be saved, but also a unified setting of the energy storage module can be achieved; thereby, while increasing capacity, additional system costs can be avoided, thereby improving the economy of modular energy storage.

[0085] In some embodiments, the first energy storage module 31 further includes a first mounting bracket, and the first mounting bracket is fixedly connected to the inner wall surface of the first energy storage module 31 , and the first power module 311 and the first energy storage assembly 312 are respectively fixedly connected to the first mounting bracket.

[0086] In some embodiments, the second energy storage module 32 further includes a second mounting bracket, and the second mounting bracket is fixedly connected to the inner wall surface of the second energy storage module 32, and the second energy storage assembly 321 is fixedly connected to the second mounting bracket.

[0087] In an embodiment of the present utility model, both the first energy storage module 31 and the second energy storage module 32 include a mounting bracket, which is fixed in the corresponding energy storage module. For example, the first mounting bracket is fixed in the first energy storage module 31 and is used to fix the first power module 311 and the first energy storage assembly 312; the second mounting bracket is fixed in the second energy storage module 32 and is used to fix the second energy storage assembly 321. In this way, safety hazards caused by unstable installation of the first power module 311, the first energy storage assembly 312 and the second energy storage assembly 321 can be avoided, especially damage to the modules caused by moving back and forth during transportation.

[0088] In a possible implementation, the first energy storage component 312 and the at least one second energy storage component 321 are respectively connected in parallel to the output end of the first power module 311 .

[0089] In the embodiment of the present utility model, Figure 3For example, the energy storage submodule 30 includes a first energy storage module 31 and a second energy storage module 32. The first output end of the first power module 311 and the positive end of the first energy storage component 312 are both connected to the positive end of the first DC interface P1, and the second output end of the first power module 311 and the negative end of the first energy storage component 312 are both connected to the negative end of the first DC interface P1; the positive end of the second energy storage component 321 is connected to the positive end of the second DC interface P2, and the negative end of the second energy storage component 321 is connected to the negative end of the second DC interface P2. In addition, the positive end of the first DC interface P1 is connected to the positive end of the second DC interface P2, and the negative end of the first DC interface P1 is connected to the negative end of the second DC interface P2. In short, the first output end of the first power module 311 is respectively connected to the positive end of the first energy storage component 312 and the positive end of the second energy storage component 321, and the second output end of the first power module 311 is respectively connected to the negative end of the first energy storage component 312 and the negative end of the second energy storage component 321.

[0090] It should be noted that in the embodiment of the present invention, the multiple energy storage units in the first energy storage assembly 312 are connected via a first connecting assembly. Therefore, the positive terminal of the first energy storage assembly 312 can also be referred to as the "positive terminal of the first connecting assembly," and the negative terminal of the first energy storage assembly 312 can also be referred to as the "negative terminal of the first connecting assembly." The multiple energy storage units in the second energy storage assembly 321 are connected via a second connecting assembly. Therefore, the positive terminal of the second energy storage assembly 321 can also be referred to as the "positive terminal of the second connecting assembly," and the negative terminal of the second energy storage assembly 321 can also be referred to as the "negative terminal of the second connecting assembly."

[0091] That is, in the energy storage submodule 30, the first energy storage component is connected in parallel with at least one second energy storage component. By connecting multiple energy storage components in parallel, the current is increased, and the capacity of the container-type energy storage submodule is increased, which is conducive to expanding the container energy storage capacity. Moreover, based on this parallel expansion implementation method, the problem of small capacity of DC direct-hung energy storage valves in related technologies is solved, and the economic efficiency of container-type energy storage is improved. It should be noted that Figure 3 Only one second energy storage module 32 is shown in the figure, but the second energy storage components 321 in multiple second energy storage modules 32 can also be connected in parallel, which is not limited here.

[0092] In another possible implementation, the first energy storage component 312 is connected in series with at least one second energy storage component 321 , and the series-connected first energy storage component 312 and at least one second energy storage component 321 are connected to the output end of the first power module.

[0093] In the embodiment of the present utility model, Figure 5As shown, still taking the energy storage submodule 30 including the first energy storage module 31 and the second energy storage module 32 as an example, the first output terminal of the first power module 311 is connected to the positive terminal of the first energy storage component 312, and the negative terminal of the first energy storage component 312 is connected to the positive terminal of the first DC interface P1; the positive terminal of the second energy storage component 321 is connected to the positive terminal of the second DC interface P2, and the positive terminal of the first DC interface P1 is connected to the positive terminal of the second DC interface P2; in addition, the negative terminal of the second energy storage component 321 is connected to the negative terminal of the second DC interface P2, the second output terminal of the first power module 311 is connected to the negative terminal of the first DC interface P1, and the negative terminal of the first DC interface P1 is connected to the negative terminal of the second DC interface P2. In simple terms, the first output terminal of the first power module 311 is connected to the positive terminal of the first energy storage component 312, the negative terminal of the first energy storage component 312 is connected to the positive terminal of the second energy storage component 321, and the negative terminal of the second energy storage component 321 is connected to the second output terminal of the first power module 311.

[0094] That is, in the energy storage submodule 30, the first energy storage component can be connected in series with at least one second energy storage component. By connecting multiple energy storage components in series, the voltage is increased, and the capacity of the container-type energy storage submodule is increased, which is conducive to expanding the container energy storage capacity. Moreover, based on this series expansion implementation method, the problem of small capacity of DC direct-hung energy storage valves in related technologies is solved, and the economic efficiency of container-type energy storage is improved. It should be noted that Figure 5 Only one second energy storage module 32 is shown in the figure, but the second energy storage components 321 in multiple second energy storage modules 32 can also be connected in series, which is not limited here.

[0095] It should be noted that, in the embodiment of the present invention, for the first energy storage component 312 or the second energy storage component 321, the energy storage unit therein mainly includes an energy storage element, and the number of energy storage elements is at least one. That is to say, in the embodiment of the present invention, only one energy storage element can be provided in the energy storage unit, or multiple energy storage elements can also be provided in the energy storage unit. Among them, the energy storage element can be in various forms, and for example, it can include batteries, supercapacitors, flywheel energy storage, gas compression energy storage or any combination thereof. In addition, other devices known in the art that can store electrical energy, such as cascade batteries, can also be selected. Those skilled in the art can make a choice from these devices according to actual needs.

[0096] In a possible embodiment, the energy storage element may be a battery, and each energy storage unit may be composed of one or more batteries connected in series or parallel. In this case, the energy storage assembly may also be called a battery module, a battery module, or a battery cluster.

[0097] In one possible embodiment, the energy storage submodule adopts a modular solution, such as a first energy storage module 31 and a second energy storage module 32. In the embodiment of the present invention, the first energy storage module 31 and the second energy storage module 32 can be in the form of a prefabricated cabin; or, the first energy storage module 31 and the second energy storage module 32 can be in the form of a container.

[0098] That is, for the first and second energy storage modules in the energy storage submodule 30, prefabricated cabins, containers, or other cabinets can all be used as a modular structure, without any limitation. The following description only takes the modularization in the form of a container as an example.

[0099] Understandably, although container-type energy storage solutions exist in related technologies, they only use one container. To achieve capacity expansion, technicians in this field typically use larger containers (e.g., non-standard containers larger than 20 feet). However, non-standard containers are not conducive to standardized design and cannot solve the problem of convenient transportation. In particular, non-standard containers are not supported in sea transportation, resulting in very high system design and transportation costs. Moreover, for high-altitude scenarios, due to the high altitude, the available space inside a single container is very small, making the system capacity of container energy storage relatively low. In this way, when the power modules can provide the same capacity, the capacity of the existing battery modules is relatively small, resulting in a large margin in the power modules, which causes a waste of resources.

[0100] In some embodiments, the housing of the first energy storage module 31 and the housing of the second energy storage module 32 are at the same potential.

[0101] In an embodiment of the present invention, the outer shell of the first energy storage module 31 and the outer shell of the second energy storage module 32 have the same potential, and the potential can match the voltage of the energy storage sub-module 30. In this way, the environmental voltage of the energy storage components in the first energy storage module 31 and the second energy storage module 32 is uniform, thereby reducing the discharge risk of the same energy storage sub-module in different energy storage modules.

[0102] For example, in an embodiment of the present invention, the equipotential method includes but is not limited to connecting the potential of the shell of the first energy storage module and the shell of the second energy storage module located on the insulating platform together through electrodes, conductors, etc., or the shell of the first energy storage module and the shell of the second energy storage module can also be grounded through a conductor. The equipotential method is not specifically limited here.

[0103] It should also be noted that in the embodiment of the present invention, the power module is limited by its power capacity, that is, the voltage * current capacity. The power upper limit of the first power module 311 here exceeds 3 to 6 MW. The capacity of a single container is limited by the unit volume capacity of the energy storage component itself. Since the voltage of a single cell is approximately 3V, and the current depends on the specifications, for example, for a 200-600Ah, 1C battery, the charging current is 200-600A. Therefore, due to the volume of the energy storage module, the upper limit of the number of batteries determines the power and capacity of the battery. The current technical solution is that the energy storage capacity of a single container is smaller than that of low-voltage energy storage container products (for example, the number of batteries is small). At the same time, the power of the energy storage component is far lower than the power upper limit of the power module (the battery end does not exceed 2MW). Therefore, the energy storage solution of the embodiment of the present invention will involve capacity expansion.

[0104] Based on this, in an embodiment of the present invention, the energy storage submodule 30 provides a solution in which multiple containers are used within a single module. The container is a modular structural form, and the first energy storage module includes a first power module and a first energy storage component, and the second energy storage module includes a second energy storage component. By connecting the energy storage components in these energy storage modules in parallel / series, and the first power module can cover the capacity required by the energy storage components in these energy storage modules, the capacity of the container-type energy storage submodule can be increased, which is conducive to the expansion of container energy storage. Moreover, the expansion method is simple. Only by connecting these multiple energy storage components in parallel / series can the expansion of container energy storage be achieved, thereby solving the problem of small capacity and difficulty in expansion of DC direct-hung energy storage valves in related technologies. In addition, due to the simple circuit structure of this modular solution, while increasing capacity, it can also avoid additional system costs, thereby improving the economy of container-type energy storage.

[0105] It can also be understood that in the embodiment of the present invention, the implementation method of the above-mentioned series expansion is limited by the voltage of the power module on the one hand, which makes the number of series connections limited; on the other hand, the energy storage component itself is internally connected with multiple energy storage units. At this time, the energy storage components between different energy storage modules are connected in series (i.e., cross-module series connection), which is not conducive to voltage and current balancing between energy storage components, nor is it conducive to battery management. Therefore, considering the unfavorable factors of series expansion, an implementation method based on parallel expansion can be selected here. In the embodiment of the present invention, the following detailed description is given by taking the implementation method based on parallel expansion as an example.

[0106] In another embodiment of the present invention, taking two energy storage modules connected in parallel (a first energy storage module 31 and a second energy storage module 32) as an example, the first energy storage module 31 and the second energy storage module 32 can be placed back to back. Figure 3For example, a first opening is provided on the back of the first energy storage module 31 and a second opening is provided on the back of the second energy storage module 32 , and a connecting component for connecting the first DC interface P1 and the second DC interface P2 passes through the first opening and the second opening.

[0107] In this embodiment of the present invention, the first DC interface P1 can be provided at the first opening of the first energy storage module 31, and the second DC interface P2 can be provided at the second opening of the second energy storage module 32. Thus, the first energy storage module 31 and the second energy storage module 32 are placed back-to-back, which not only saves storage space but also shortens the connecting components between the first and second DC interfaces, reducing losses in the connecting components. Furthermore, the back-to-back arrangement of the two energy storage modules also facilitates maintenance and management of the two energy storage modules.

[0108] In an embodiment of the present utility model, for this modular solution, in addition to being placed back to back, the first energy storage module 31 and the second energy storage module 32 can also be stacked, or the first energy storage module 31 and the second energy storage module 32 can be connected at the ends, etc., without any limitation here.

[0109] In some embodiments, the connection components include at least one of the following: a high-voltage cable, a DC busbar, and a laminated busbar. When using a DC busbar or a foldable laminated busbar, a wall bushing may be used. This not only protects the connection components but also provides insulation between the connection components and the energy storage module housing, thereby improving safety.

[0110] That is to say, due to the high insulation requirements of the DC direct-mounted energy storage valve, the connection components between the first energy storage module 31 and the second energy storage module 32 can be realized by including but not limited to high-voltage cables, wall bushings combined with DC busbars or foldable laminated busbars, thereby improving safety.

[0111] In some embodiments, the energy storage submodule 30 may further include a confluence module (not shown in the figure), which is located between the first energy storage module 31 and the second energy storage module 32 .

[0112] In which, the convergence module may include a fourth DC interface and a fifth DC interface, and the fourth DC interface and the fifth DC interface are connected inside the convergence module; and the first DC interface of the first energy storage module 31 is connected to the fourth DC interface of the convergence module, and the second DC interface of the second energy storage module 32 is connected to the fifth DC interface of the convergence module, thereby enabling the connection between the first energy storage component 312 in the first energy storage module 31 and the second energy storage component 321 in the second energy storage module 32.

[0113] In the embodiment of the present invention, the energy storage submodule 30 may include, in addition to the first energy storage module 31 and the second energy storage module 32, a confluence module, or the energy storage submodule 30 may not include a confluence module; or multiple energy storage submodules in the energy storage system may share one confluence module, and no limitation is imposed on the confluence module.

[0114] In some embodiments, the first energy storage module 31 and the second energy storage module 32 have the same size and both meet preset size specifications.

[0115] It should be noted that existing DC direct-mount energy storage valves are based on indoor valve hall arrangements, and the energy storage submodules utilize steel frames, resulting in relatively high overall structural component costs. In the embodiments of the present utility model, containers are used as the frame and housing for the energy storage submodule 30. This not only reduces structural component costs, but also makes the container solution suitable for outdoor deployments of DC direct-mount energy storage valves. Therefore, the development of container-based energy storage submodules is of great significance to the promotion of DC direct-mount energy storage valves.

[0116] It should also be noted that, in the embodiment of the present invention, a container is used as a modular structural form. For the first energy storage module 31 and the second energy storage module 32, a container of a preset size specification, such as a container of a standard size specification or a container of a non-standard size specification, can be used. The preset size specification here can refer to a standard size specification of a container, such as a 20-foot container. Since the standard 20-foot container has the lowest cost and is suitable for sea transportation, the standard 20-foot container is the preferred form for the first energy storage module 31 and the second energy storage module 32.

[0117] In addition, in the embodiments of the present invention, it should be noted that if a confluence module is included, the confluence module can have the same structural form as the first energy storage module and the second energy storage module, such as a container, prefabricated cabin, etc. Moreover, for a unified design, the dimensions of the confluence module can also be the same as those of the energy storage module and both meet preset size specifications.

[0118] In the embodiment of the present invention, the energy storage submodule 30 adopts a parallel connection scheme of the first energy storage module 31 and the second energy storage module 32 instead of using a larger container. The reason is that for high-altitude scenarios, due to the influence of the high altitude, the available space inside a single container is relatively small; in addition, if the single container is a non-standard size container, then the problem of convenient transportation cannot be solved, especially the sea transportation does not support non-standard size containers (for example, non-20-foot containers).

[0119] Thus, in the embodiment of the present invention, the first energy storage module and the second energy storage module both use containers of preset size specifications, which not only allows the reuse of existing 20-foot containers to reduce costs, but also facilitates transportation, especially when sea transportation is involved, thereby taking into account both transportation convenience and economy.

[0120] In another embodiment of the present invention, Figure 3 Based on the energy storage submodule 30 shown, see Figure 6 The first power module 311 may include a first power unit 411 and a first switch unit 412. The output end of the first power unit 311 is connected to the first connection component and at least one second connection component through the first switch unit 412.

[0121] In the embodiment of the present invention, the first switch unit 412 may include a first positive side switch and / or a first negative side switch. Figure 6 As shown, the first switch unit 412 may include a first positive side switch S1 and a first negative side switch S2, the first positive side switch S1 is connected between the first power unit 411 and the positive terminal of the first energy storage component 312 and the positive terminal of at least one second energy storage component 321, and the first negative side switch S2 is connected between the first power unit 411 and the negative terminal of the first energy storage component 312 and the negative terminal of at least one second energy storage component 321.

[0122] Thus, in the embodiment of the present invention, the first connecting component is connected to the at least one second connecting component, thereby connecting the first energy storage component and the at least one second energy storage component together. By utilizing the first switching unit to control the path between the output end of the first power unit and the first connecting component and the at least one second connecting component, the first switching unit can control the charge and discharge of the first energy storage component and the at least one second energy storage component. Thus, according to the closing and opening of the first switching unit, the first power unit can control the charge and discharge of the first energy storage component and the at least one second energy storage component (for example, the charge and discharge activation or deactivation function), thereby improving the charge and discharge efficiency.

[0123] In some embodiments, see Figure 6 The first power module 311 may further include a first bypass switch K1. The first bypass switch K1 is connected in parallel to the input of the first power unit 411. The output of the first power unit 411 is connected to the first connection assembly and the second connection assembly via the first switch unit 412. In other words, the output of the first power unit 411 can be connected to the first energy storage assembly 312 and the second energy storage assembly 321 via the first switch unit 412.

[0124] In the embodiment of the present invention, the first bypass switch K1 is used to bypass the first power module 311 when an abnormality occurs in the first power module 311. In other words, if the first power module 311 fails, the first bypass switch K1 can be closed to bypass the first power module 311, and the charging and discharging of the first energy storage assembly 312 and the second energy storage assembly 321 will be stopped.

[0125] It should be noted that the number of the second energy storage component 321 is at least one. Figure 6 An example in which the number of the second energy storage module 32 is one is provided for illustrative purposes only, but the present invention is not limited thereto.

[0126] Thus, in the embodiment of the present invention, by connecting the energy storage components in the first energy storage module 31 and the second energy storage module 32 in parallel, and the first power module 311 can cover the capacity required by the energy storage components in these two energy storage modules, this parallel expansion is simple to implement, thereby not only solving the problem of small capacity and difficulty in expansion of DC direct-hung energy storage valves, but also improving the economy of container-type energy storage.

[0127] In some embodiments, for the first power unit 411 , the power unit may include a half-bridge circuit composed of power devices.

[0128] In the embodiment of the present invention, the power device can be a switch tube, a triode, a transistor, an insulated gate bipolar transistor (IGBT), a metal-oxide semiconductor field-effect transistor (MOSFET or MOS tube), etc., without any limitation here.

[0129] In addition, in the embodiment of the present invention, the first power unit here is not limited to a half-bridge circuit composed of power devices, but can also be a full-bridge circuit, H-bridge circuit, push-pull circuit, full-bridge and half-bridge hybrid circuit, etc. composed of power devices, and no limitation is made here.

[0130] It should be noted that, in the embodiment of the present invention, the first power unit adopts a half-bridge circuit, which not only can realize the charging and discharging functions of the energy storage submodule, but also uses only two power devices, thereby reducing costs.

[0131] In some embodiments, for the first switch unit 412 , the switch unit may include a first positive-side switch and / or a first negative-side switch.

[0132] It should be noted that, in the embodiment of the present invention, when the first switch unit 412 includes a first positive switch S1 and a first negative switch S2, the first positive switch S1 and the first negative switch S2 can be configured to operate independently, or the first negative switch S2 can be configured to be in a closed state. In this way, since the first positive switch S1 and the first negative switch S2 can be configured to operate independently, or the first negative switch S2 can be configured to be always in a closed state, different operating modes can be covered, thereby enabling the charging and discharging of the first energy storage component 312 and the second energy storage component 321 to be enabled or disabled.

[0133] In another embodiment of the present invention, the first power unit 411 includes two power devices, and the first switch unit 412 includes two switch devices. Figure 6 As shown, the first power module 311 may include a first power device T1, a second power device T2, a first bypass switch K1, a first positive side switch S1 and a first negative side switch S2, and the first bypass switch K1 is connected in parallel to both ends of the second power device T2.

[0134] In the embodiment of the present utility model, Figure 6 As shown, the input positive terminal (+) is respectively connected to the first end of the first bypass switch K1, the first end of the second power device T2 and the second end of the first power device T1; the first end of the first power device T1 is respectively connected to the positive terminal of the first energy storage component 312 and the positive terminal of the second energy storage component 321 through the first positive side switch S1, and the input negative terminal (-) is respectively connected to the second end of the first bypass switch K1 and the second end of the second power device T2 and is respectively connected to the negative terminal of the first energy storage component 312 and the negative terminal of the second energy storage component 321 through the first negative side switch S2.

[0135] In the embodiment of the present utility model, Figure 6 As shown, the first power module 311 may further include a first capacitor C1, which is connected in parallel to the output end of the first power unit 411. Here, the first capacitor C1 may function as an energy storage filter.

[0136] In the embodiment of the present utility model, Figure 6 As shown, the first power unit 411 may further include a first diode D1 and a second diode D2, wherein the first diode D1 is connected in parallel to the first and second ends of the first power device T1, and the second diode D2 is connected in parallel to the first and second ends of the second power device T2.

[0137] It should be noted that both the first diode D1 and the second diode D2 can be integrated into the corresponding power device, that is, they are the internal diodes of the corresponding power device, for example, the first diode D1 is the internal diode of the first power device T1, and the second diode D2 is the internal diode of the second power device T2; or they can be separately provided from the corresponding power device, that is, they are independent components, for example, the first diode D1 is independently provided with the first power device T1, and the second diode D2 is independently provided with the second power device T2; no limitation is made here.

[0138] Thus, in an embodiment of the present invention, the energy storage submodules can adopt a modular parallel solution. Taking the container form as an example, the first energy storage module includes a first power module and a first energy storage component, and the second energy storage module includes a second energy storage component. Moreover, the first power module can cover the capacity required by the energy storage components in these energy storage modules. In this way, by connecting the energy storage components in these energy storage modules in parallel, not only can the capacity of the energy storage submodules be expanded, solving the problem of the small capacity of the DC direct-hung energy storage valve, but also the economy of container-type energy storage can be improved.

[0139] In one possible implementation, based on Figure 6 The energy storage submodule 30 shown is shown in FIG. Figure 7 At this time, the energy storage submodule 30 is in charging mode. Specifically, when the first power module 311 is normal and in charging mode, the energy storage submodule 30 is configured to control the first power device T1 and the second power device T2 to be turned off and the first positive switch S1 and the first negative switch S2 to be closed, thereby charging the first energy storage component 312 and the second energy storage component 321 through the first power module 311.

[0140] In some embodiments, based on Figure 6 The energy storage submodule 30 shown is shown in FIG. Figure 8 At this time, the energy storage submodule 30 is in the discharge input mode. Specifically, when the first power module 311 is normal and in the discharge input mode, the energy storage submodule 30 is further configured to control the first power device T1 to be in the on state, the second power device T2 to be in the off state, and the first positive-side switch S1 and the first negative-side switch S2 to be closed, thereby discharging the first energy storage component 312 and the second energy storage component 321 through the first power module 311.

[0141] In an embodiment of the present invention, when the energy storage submodule 30 is in charging mode, if the first power module 311 is used to charge the energy storage components in the two energy storage modules, the first power device T1 and the second power device T2 can be controlled to be in the off state, or the first power device T1 can be controlled to be in the on state and the second power device T2 can be controlled to be in the off state. It should be noted that the current flowing through the first power device T1 in the charging mode and the discharging mode is opposite.

[0142] In the embodiment of the present utility model, Figure 7 and Figure 8 As shown by the bold lines in FIG, in the charging or discharging mode, the energy storage submodule 30 can utilize the first power module to charge and discharge the energy storage components in the two energy storage modules. This not only increases the capacity of the DC direct-hook energy storage valve, solving the problem of small capacity and difficulty in expanding the DC direct-hook energy storage valve, but also improves the economic efficiency of containerized energy storage.

[0143] In another possible implementation, based on Figure 6 The energy storage submodule 30 shown is shown in FIG. Figure 9 At this time, the energy storage submodule 30 is in the charge cutoff mode. Specifically, when the first power module 311 is normal and in the charge cutoff mode, the energy storage submodule 30 is configured to control the first power device T1 to be in the off state, the second power device T2 to be in the on state, and the first positive-side switch S1 and / or the first negative-side switch S2 to be disconnected, thereby cutting off the charging path of the first energy storage component 312 and the second energy storage component 321.

[0144] In some embodiments, based on Figure 6 The energy storage submodule 30 shown is shown in FIG. Figure 10 At this time, the energy storage submodule 30 is in the discharge cutoff mode. Specifically, when the first power module 311 is normal and in the discharge cutoff mode, the energy storage submodule 30 is further configured to control the first power device T1 and the second power device T2 to be in the off state, and the first positive-side switch S1 and / or the first negative-side switch S2 to be disconnected, thereby cutting off the discharge path of the first energy storage component 312 and the second energy storage component 321.

[0145] In the embodiment of the present invention, charging cutoff cannot be achieved through the first bypass switch K1 in the charging cutoff mode. The reason is that the bypass switch is a type of protective device, which mainly bypasses the power module by closing the bypass switch when a power module fails, and cannot be used as a conventional current path.

[0146] In the embodiment of the present utility model, Figure 9 and Figure 10As shown by the bold lines in the figure, in the charge cutoff mode, the energy storage submodule 30 can realize the charge cutoff of the energy storage components in the two energy storage modules by turning on the second power device T2; in the discharge cutoff mode, the discharge cutoff of the energy storage components in the two energy storage modules can be realized by the diode connected in parallel with the second power device T2.

[0147] In an embodiment of the present invention, when the energy storage submodule 30 is in the discharge cutoff mode, the second power device T2 can be controlled to be in the off state, or the second power device T2 can be controlled to be in the on state. When the second power device T2 is in the on state, the discharge current can flow through the second power device T2 and / or the second diode D2.

[0148] It is understandable that in the embodiment of the present invention, a third switch unit may be further provided in the parallel path between the second energy storage component 321 and the first energy storage component 312. Thus, if the required capacity of the energy storage system is relatively low, the third switch unit may be disconnected, and only the first energy storage module 31 may be used as the energy storage submodule. If the required capacity of the energy storage system is relatively large, the third switch unit may be closed, and the first energy storage component 312 in the first energy storage module 31 and the second energy storage component 321 in the second energy storage module 32 may be connected in parallel to form an energy storage submodule, thereby increasing sufficient bridge arm current.

[0149] However, in actual application scenarios, the capacity of the energy storage system has been clearly defined during the design phase, and whether the second energy storage module 32 needs to be connected is determined. Therefore, in the embodiment of the present invention, there is no need to add a third switch unit in combination with the application scenario, thus avoiding additional component costs.

[0150] In another embodiment of the present invention, see Figure 11 、 Figure 12 and Figure 13 The energy storage submodule 30 may further include a second power module 322, which is located within the second energy storage module 32. The input of the first power module 311 is connected to the input of the second power module 322, and the output of the second power module 322 is connected to the second connection assembly and the first connection assembly via the second switch unit 323. In other words, the output of the second power module 322 can be connected to the second energy storage assembly 321 and the first energy storage assembly 312 via the second switch unit 323.

[0151] In this embodiment of the present invention, the power interface of the first energy storage module 31 is connected to the input terminal of the first power module 311, and the power interface of the second energy storage module 32 is connected to the second power module 322. The negative terminal of the power interface of the first energy storage module 31 is connected to the positive terminal of the power interface of the second energy storage module 32, and the positive terminal of the power interface of the first energy storage module 31 and the negative terminal of the power interface of the second energy storage module 32 are used to connect to other energy storage sub-modules in the energy storage system.

[0152] In one possible implementation, Figure 11 As shown, the second switch unit 323 may include a second positive switch S3 and a second negative switch S4. The second positive switch S3 is connected between the first output terminal of the second power module 322 and the positive terminal of the second energy storage component 321, and the second negative switch S4 is connected between the second output terminal of the second power module 322 and the negative terminal of the second energy storage component 321. Alternatively, the second positive switch S3 is connected between the first output terminal of the second power module 322 and the positive terminal of the first energy storage component 312, and the second negative switch S4 is connected between the second output terminal of the second power module 322 and the negative terminal of the first energy storage component 312.

[0153] In this embodiment of the present invention, when the second positive-side switch S3 and the second negative-side switch S4 are closed, the first power module 311 and the second power module 322 can be redundant. In this implementation, the first power module 311 can control the charging and discharging of the first energy storage component 312 and the second energy storage component 321, or the second power module 322 can control the charging and discharging of the first energy storage component 312 and the second energy storage component 321.

[0154] For example, if there is no abnormality in the first power module 311, the second positive side switch S3 and the second negative side switch S4 are disconnected at this time, and then the first energy storage component 312 and the second energy storage component 321 are controlled by the first power module 311 to charge and discharge; otherwise, if there is an abnormality in the first power module 311, the second positive side switch S3 and the second negative side switch S4 can be closed at this time, and then the first energy storage component 312 and the second energy storage component 321 are controlled by the second power module 322 to charge and discharge.

[0155] In another possible implementation, Figure 12 As shown, the second switch unit 323 may include a third positive-side switch S5 and a third negative-side switch S6. The third positive-side switch S5 is connected between the first output terminal of the second power module 322 and the first output terminal of the first power module 311, and the third negative-side switch S6 is connected between the second output terminal of the second power module 322 and the second output terminal of the first power module 311.

[0156] In the embodiment of the present disclosure, when the third positive-side switch S5 and the third negative-side switch S6 are closed, the first power module 311 and the second power module 322 can also be redundant. In this implementation, the first power module 311 can control the charging and discharging of the first energy storage component 312 and the second energy storage component 321, or the second power module 322 can control the charging and discharging of the first energy storage component 312 and the second energy storage component 321.

[0157] For example, if there is no abnormality in the first power module 311, the third positive switch S5 and the third negative switch S6 are disconnected at this time, and then the first energy storage component 312 and the second energy storage component 321 are controlled by the first power module 311 to be charged and discharged; otherwise, if an abnormality occurs in the first power module 311, the third positive switch S5 and the third negative switch S6 can be closed at this time, and then the first energy storage component 312 and the second energy storage component 321 are controlled by the second power module 322 to be charged and discharged.

[0158] In another possible implementation, Figure 13 As shown, the second switch unit 323 may include a fourth positive switch S7, a fourth negative switch S8, a fifth positive switch S9, and a fifth negative switch S10. The fourth positive switch S7 is connected between the first output terminal of the first power module 311 and the positive terminal of the first energy storage component 312, and the fourth negative switch S8 is connected between the second output terminal of the first power module 311 and the negative terminal of the first energy storage component 312; the fifth positive switch S9 is connected between the first output terminal of the second power module 322 and the positive terminal of the second energy storage component 321, and the fifth negative switch S10 is connected between the second output terminal of the second power module 322 and the negative terminal of the second energy storage component 321.

[0159] In the embodiment of the present disclosure, when the fourth positive switch S7, the fourth negative switch S8, the fifth positive switch S9, and the fifth negative switch S10 are all closed, the first power module 311 and the second power module 322 may also be redundant with each other. In this implementation, the fourth positive switch S7 and the fourth negative switch S8 may be closed, the fifth positive switch S9 and the fifth negative switch S10 may be disconnected, and the first power module 311 may be used to control the first energy storage component 312 and the second energy storage component 321 to charge and discharge. Alternatively, the fifth positive switch S9 and the fifth negative switch S10 may be closed, the fourth positive switch S7 and the fourth negative switch S8 may be disconnected, and the second power module 322 may be used to control the first energy storage component 312 and the second energy storage component 321 to charge and discharge.

[0160] For example, if there is no abnormality in the first power module 311, the fourth positive switch S7 and the fourth negative switch S8 can be closed, and the fifth positive switch S9 and the fifth negative switch S10 can be disconnected, and then the first energy storage component 312 and the second energy storage component 321 are controlled by the first power module 311 to be charged and discharged; otherwise, if an abnormality occurs in the first power module 311, the fifth positive switch S9 and the fifth negative switch S10 can be closed, and the fourth positive switch S7 and the fourth negative switch S8 can be disconnected, and then the first energy storage component 312 and the second energy storage component 321 are controlled by the second power module 322 to be charged and discharged.

[0161] That is to say, in the embodiment of the present invention, the first energy storage module 31 and the second energy storage module 32 both include a power module and an energy storage component, and the multiple energy storage units in each energy storage component are connected through corresponding connecting components; a single power module can also cover the capacity required by the energy storage components in the two energy storage modules, such as the capacity required by the first energy storage component and the second energy storage component; in this way, by connecting the energy storage components in the two energy storage modules, the capacity of the energy storage sub-module can be increased, thereby realizing the expansion of container energy storage; and the expansion method is simple, only using the energy storage components in multiple energy storage modules for connection, which solves the problem of small capacity and difficulty in expansion of DC direct-hung energy storage valves in related technologies; at the same time, the first power module and the second power module can also be redundant with each other, thereby improving the redundancy rate within the energy storage sub-module, thereby improving the reliability of the energy storage sub-module.

[0162] In another embodiment of the present invention, see Figure 14 The energy storage submodule 30 may further include a third energy storage module 33. The third energy storage module 33 includes a third power module 331 and a third energy storage assembly 332. The output end of the third power module 331 is connected to the third energy storage assembly 332 and at least one second energy storage assembly 321. In this embodiment of the present invention, the third energy storage assembly 332 may include multiple energy storage units, which are connected via a third connecting assembly. Thus, the output end of the third power module 331 may be connected to the third connecting assembly and at least one second connecting assembly.

[0163] In the embodiment of the present invention, the third energy storage module 33 can be placed in any direction, such as the front, back, left, and right, of the first energy storage module 31 and the second energy storage module 32, and is not specifically limited here. Figure 14 As shown, the third energy storage module 33 is placed on the other side of the second energy storage module 32 , so that the second energy storage module 32 is located between the first energy storage module 31 and the third energy storage module 33 .

[0164] In an embodiment of the present invention, the power interface of the first energy storage module 31 is connected to the input terminal of the first power module 311, and the power interface of the third energy storage module 33 is connected to the third power module 331. The negative terminal of the power interface of the first energy storage module 31 is connected to the positive terminal of the power interface of the third energy storage module 33, and the positive terminal of the power interface of the first energy storage module 31 and the negative terminal of the power interface of the third energy storage module 33 are used to connect to other energy storage sub-modules in the energy storage system.

[0165] In an embodiment of the present invention, the second energy storage component 321 can be connected in parallel to the output end of the first power module 311, or can be connected in parallel to the output end of the third power module 331, or can be connected in parallel to the output end of the first power module 311 and the output end of the third power module 331.

[0166] In one possible implementation, Figure 14 As shown, the second energy storage module 32 may further include a sixth positive-side switch S11, a sixth negative-side switch S12, a seventh positive-side switch S13, and a seventh negative-side switch S14. The sixth positive-side switch S11 is connected between the positive terminal of the first energy storage component 312 and the positive terminal of the second energy storage component 321, and the sixth negative-side switch S12 is connected between the negative terminal of the first energy storage component 312 and the negative terminal of the second energy storage component 321; the seventh positive-side switch S13 is connected between the positive terminal of the third energy storage component 332 and the positive terminal of the second energy storage component 321, and the seventh negative-side switch S14 is connected between the negative terminal of the third energy storage component 332 and the negative terminal of the second energy storage component 321.

[0167] It should also be noted that in the embodiment of the present invention, for the third energy storage component 332, the multiple energy storage units in the third energy storage component 332 are connected through the third connecting component, so the positive terminal of the third energy storage component 332 can also be called the "positive terminal of the third connecting component", and the negative terminal of the third energy storage component 332 can also be called the "negative terminal of the third connecting component".

[0168] In another possible implementation, if the sixth positive switch S11 and the sixth negative switch S12 are closed, and the seventh positive switch S13 and the seventh negative switch S14 are disconnected, then the second energy storage component 321 in the second energy storage module 32 can be connected in parallel at both ends of the first power module 311, so that the first energy storage component 312 and the second energy storage component 321 are connected in parallel. At this time, the first power module 311 controls the first energy storage component 312 and the second energy storage component 321 to be charged and discharged.

[0169] In addition, in an embodiment of the present invention, if the sixth positive switch S11 and the sixth negative switch S12 are disconnected, and the seventh positive switch S13 and the seventh negative switch S14 are closed, then the second energy storage component 321 in the second energy storage module 32 can be connected in parallel at both ends of the third power module 331, so that the third energy storage component 332 and the second energy storage component 321 are connected in parallel. At this time, the third power module 331 controls the charging and discharging of the third energy storage component 332 and the second energy storage component 321, thereby achieving the goal that the first energy storage module 31 and the third energy storage module 33 can share the second energy storage component 321 in the second energy storage module 32, and the first power module 311 and the third power module 331 are redundant with each other, thereby improving the redundancy rate within the energy storage sub-module.

[0170] That is to say, in an embodiment of the present invention, the first energy storage module 31 and the third energy storage module 33 can share the second energy storage component in the second energy storage module 32. For example, the first energy storage component and at least one second energy storage component can be controlled to charge and discharge by the first power module, or the third energy storage component and at least one second energy storage component can be controlled to charge and discharge by the third power module; in this way, based on the connection between the first connecting component and the at least one second connecting component, the connection between the first energy storage component and the at least one second energy storage component can be realized; or, based on the connection between the third connecting component and the at least one second connecting component, the connection between the third energy storage component and the at least one second energy storage component can be realized; thereby, the capacity of the container-type energy storage sub-module can be increased, solving the problem of small capacity of the DC direct-hung energy storage valve in the related art; at the same time, the first power module and the third power module are redundant with each other, and the reliability of the energy storage sub-module can also be improved.

[0171] It can be understood that in the embodiments of the present invention, the above-mentioned several implementation methods are described using the parallel expansion method as an example, but these implementation methods (for example, the second energy storage module includes a second power module and a second energy storage component, or a third energy storage module can be added, etc.) can also be implemented in the series expansion method, and no limitation is made here.

[0172] It is also understandable that in the embodiment of the present invention, the third energy storage module 33 can be in different forms such as a container of standard size or a container of non-standard size, wherein the standard size is specifically a 20-foot size.

[0173] Here, since the standard 20-foot specification can reuse existing standard containers and is suitable for sea transportation, which can reduce costs, the standard 20-foot specification is the preferred form of the third energy storage module 33.

[0174] Thus, in the embodiment of the present invention, the size of the third energy storage module 33 can be the same as that of the first energy storage module 31, and both can use containers of preset size specifications, which can not only reduce costs but also facilitate transportation, especially when it comes to sea transportation, avoiding the situation where the container size is too large and does not support sea transportation scenarios, thereby taking into account both transportation convenience and economy.

[0175] It can also be understood that in the embodiments of the present invention, the above-mentioned embodiments based on parallel expansion can also be applied to scenarios based on series expansion. The only difference is the connection method of the energy storage components, which will not be described in detail here.

[0176] An embodiment of the present invention provides an energy storage submodule. Taking the modularization in the form of a container as an example, the energy storage submodule adopts a container parallel solution, wherein the first energy storage module 31 can be a first container, and the second energy storage module 32 can be a second container, and the first container includes a power module and an energy storage component, and the second container includes an energy storage component. The power module here can cover the capacity required by the energy storage components in these containers; by connecting the energy storage components in these containers in parallel, not only the problem of small capacity and difficulty in expansion of DC direct-hung energy storage valves is solved, but also the economy of container-type energy storage is improved; in particular, these containers adopt a standard 20-foot specification, which can reduce costs while facilitating transportation, especially sea transportation, so as to achieve both transportation convenience and economy.

[0177] In yet another embodiment of the present invention, Figure 15 This is a schematic diagram of the structure of an energy storage system provided by an embodiment of the present utility model. Figure 15 As shown, the energy storage system 150 may include at least one energy storage submodule 30 shown in the above embodiment.

[0178] In an embodiment of the present invention, the energy storage system 150 may be a DC direct-connected energy storage valve. At least one energy storage submodule in the energy storage system 150 is a cascaded structure. Since each energy storage submodule can be considered a submodule of the energy storage system 150, the energy storage submodule may also be referred to as an "energy storage valve submodule" or "energy storage submodule."

[0179] In the embodiment of the present utility model, Figure 15 As shown, it is assumed that the energy storage system 150 may include k energy storage submodules (energy storage submodule 1, energy storage submodule 2, ..., energy storage submodule k), and these k energy storage submodules are usually stacked to form a high-pressure energy storage valve structure. Wherein k is a positive integer. In addition, the energy storage system 150 may also include a first inductor L1 ( Figure 15(not shown), k energy storage submodules are cascaded and connected in series with the first inductor L1 to form another possible energy storage valve structure.

[0180] In the embodiment of the present invention, for each energy storage submodule, a container-type submodule expansion solution for a DC direct-hung energy storage valve is proposed. Among them, the technical solution of the embodiment of the present invention addresses the problem of small capacity and difficulty in expansion of the DC direct-hung energy storage valve, and proposes a parallel connection solution for two containers within a single energy storage submodule. Its topology is as described above. Figure 6 shown.

[0181] Here, we take two containers connected in parallel and the energy storage components as battery modules as an example, wherein the aforementioned first energy storage module 31 can be the first container, and the aforementioned second energy storage module 32 can be the second container. Here, the first container is a complete energy storage submodule, which contains a complete power module and battery module. If the capacity required by the energy storage system is relatively low, the first container can be directly used as the energy storage submodule. The second container only contains battery modules. When the capacity required by the energy storage system is relatively large, resulting in the first container being unable to provide sufficient bridge arm current alone, the battery modules in the second container and the battery modules in the first container can be connected in parallel, and then connected to the outside through the power module in the first container.

[0182] In an embodiment of the present invention, the two containers are placed back to back, and the two containers together constitute an energy storage sub-module. Due to the high insulation requirements of the direct-mounted energy storage system, the connection of the battery modules in the two containers can be achieved through methods including but not limited to high-voltage cables, wall bushings combined with DC busbars or foldable laminated busbars.

[0183] For example, as mentioned above Figure 7 and Figure 8 As shown, in the embodiment of the present invention, in the charge and discharge input mode, the power unit in the first power module can be used to realize the charge and discharge control of the battery modules in the two containers.

[0184] For example, as mentioned above Figure 9 and Figure 10 As shown, in the charging cutoff mode, the power unit in the first power module can be used to cut off the battery modules in the two containers; in the discharging cutoff mode, the second diode can be used to cut off the battery modules in the two containers.

[0185] In the embodiment of the present invention, whether it is the first container or the second container, the container here can adopt different forms such as standard size specifications, non-standard size specifications, etc. Since the standard 20-foot specification container has the lowest cost and is suitable for sea transportation, the sizes of the first container and the second container in the embodiment of the present invention meet the preset size specifications, that is, the standard 20-foot specification is the preferred form of the DC direct-mounted energy storage valve container-type submodule.

[0186] An embodiment of the present invention provides an energy storage system. Since the energy storage submodules in the energy storage system 150 adopt a container parallel solution, and the first container includes a power module and an energy storage component, and the second container only includes an energy storage component, the power module here can also cover the capacity required by the energy storage components in these two containers; thus, by connecting the energy storage components in the two containers in parallel, the capacity of the container-type energy storage can be increased, which is conducive to achieving the expansion of container energy storage; and the expansion method is simple, thereby solving the problems of small capacity and difficulty in expansion of DC direct-mounted energy storage valves in related technologies, and at the same time improving the economy of container-type energy storage; in particular, these containers adopt a standard 20-foot specification, which reduces costs while being convenient for transportation, thereby taking into account both transportation convenience and economy, thereby improving the availability of the energy storage system.

[0187] It should be understood that those skilled in the art will appreciate that the present invention may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware embodiments. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage) containing computer-usable program code.

[0188] It should also be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present invention, the size of the serial numbers of the above-mentioned steps / processes does not mean the order of execution. The execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention. The serial numbers of the above-mentioned embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments.

[0189] It should be noted that, in the present invention, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0190] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0191] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected based on actual needs to achieve the purpose of the present embodiment. In addition, the functional units in each embodiment of the present invention may all be integrated into a single processing unit, or each unit may be independently configured as a unit, or two or more units may be integrated into a single unit; the integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0192] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An energy storage submodule, characterized in that: The energy storage submodule includes a first power module, a first energy storage module and at least one second energy storage module, wherein: The first energy storage module includes a first DC interface and a first energy storage component, the first energy storage component includes a plurality of energy storage units, and the plurality of energy storage units are connected via a first connecting component; the output end of the first power module is connected to the first connecting component, and one end of the first DC interface is connected to the first connecting component; The second energy storage module includes a second DC interface and a second energy storage assembly, the second energy storage assembly includes a plurality of energy storage units, and the plurality of energy storage units are connected via a second connecting assembly; one end of the second DC interface is connected to the second connecting assembly, and the other end of the second DC interface is connected to the other end of the first DC interface of the first energy storage module; The input end of the first power module is used to connect to other energy storage sub-modules in the energy storage system, and the power of the first power module is greater than the power of the first energy storage component.

2. The energy storage submodule according to claim 1, characterized in that: The first power module is located in the first energy storage module, wherein: The first energy storage module further includes a power interface, one end of which is connected to the input end of the first power module, and the other end of which is used to connect to other energy storage sub-modules in the energy storage system.

3. The energy storage submodule according to claim 1, characterized in that: The first energy storage component and at least one of the second energy storage components are respectively connected in parallel to the output end of the first power module.

4. The energy storage submodule according to claim 1, characterized in that: The first energy storage component is connected in series with at least one of the second energy storage components, and the series-connected first energy storage component and at least one of the second energy storage components are connected to the output end of the first power module.

5. The energy storage submodule according to claim 1, characterized in that: The first energy storage module and the second energy storage module have the same size and both meet preset size specifications.

6. The energy storage submodule according to claim 1, characterized in that: The housing of the first energy storage module and the housing of the second energy storage module are at the same potential.

7. The energy storage submodule according to claim 1, characterized in that: The first power module includes a first bypass switch, a first power unit and a first switch unit, wherein: The first bypass switch is connected in parallel to the input end of the first power unit; The output end of the first power unit is connected to the first connection component and at least one second connection component through the first switch unit.

8. The energy storage submodule according to claim 7, characterized in that: The first switch unit includes a first positive side switch and / or a first negative side switch; The first positive-side switch and the first negative-side switch are configured to operate independently, or the first negative-side switch is configured to be in a closed state.

9. The energy storage submodule according to any one of claims 1 to 8, characterized in that: When the number of the second energy storage module is one, the first energy storage module and the second energy storage module are placed back to back; A first opening is provided on the back of the first energy storage module, and a second opening is provided on the back of the second energy storage module. A connecting component for connecting the first DC interface and the second DC interface passes through the first opening and the second opening.

10. The energy storage submodule according to claim 9, characterized in that: The connecting component includes at least one of the following: a high-voltage cable, a DC busbar, and a laminated busbar.

11. The energy storage submodule according to claim 1, characterized in that: The energy storage submodule further includes a second power module, and the second power module is located in the second energy storage module, wherein: The input end of the first power module is connected to the input end of the second power module; The output end of the second power module is connected to the second connecting component and the first connecting component through a second switch unit.

12. The energy storage submodule according to claim 1, characterized in that: The energy storage submodule further includes a third energy storage module, wherein: The third energy storage module includes a third power module and a third energy storage assembly. The third energy storage assembly includes multiple energy storage units, and the multiple energy storage units are connected through a third connecting assembly; and the output end of the third power module is connected to the third connecting assembly and at least one of the second connecting assemblies.

13. An energy storage system, characterized in that: The energy storage system comprises at least two energy storage submodules according to any one of claims 1 to 12.

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