Energy management method, device and system of energy storage system

Abstract

The invention provides an energy management method, device and system of an energy storage system, the energy storage system comprises a plurality of battery clusters, the method is applied to an energy storage converter, the energy storage converter is in one-to-one correspondence with the battery clusters, and the method comprises the following steps: receiving the charge and discharge priority of each battery cluster in the energy storage system sent by a controller; and charging and discharging each battery cluster according to the charging and discharging state of the energy storage system and the charging and discharging priority of each battery cluster in the energy storage system so as to reduce the maintenance cost of the distributed energy storage system.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to an energy management method, device, and system for an energy storage system. Background Art

[0002] As the largest power source of a target electric vehicle, the battery plays an increasingly important role in the field of electric vehicles. For a target wide area network, there are usually multiple distributed energy storage systems. How to manage the energy of each distributed energy storage system within the same target wide area network is a hot topic in current research.

[0003] Currently, when managing the energy of each distributed energy storage system within the same target wide area network, the maintenance and repair costs of the distributed energy storage system are too high. Summary of the Invention

[0004] In view of the above problems, this application provides an energy management method, device, and system for an energy storage system to reduce the maintenance and repair costs of the distributed energy storage system.

[0005] In a first aspect, an embodiment of this application provides an energy management method for an energy storage system. The energy storage system includes multiple battery clusters. This method is applied to an energy storage converter, and the energy storage converter corresponds to each battery. The method includes: receiving the charge and discharge priorities of each battery cluster in the energy storage system sent by a controller; performing charge and discharge on each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system.

[0006] Thus, by receiving the charge and discharge priorities of each battery cluster in the energy storage system sent by the controller through the energy storage converter, and then performing charge and discharge on each battery cluster in the energy storage system according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system, instead of performing charge and discharge on the energy storage system as a whole, but performing charge and discharge based on each battery cluster in the energy storage system, it will not cause the problem that the frequent replacement of battery clusters due to the imbalance of energy in each battery cluster in the energy storage system affects the service life of the battery clusters. The solution of the embodiment of this application realizes the charge and discharge of each battery cluster in a single energy storage system and reduces the maintenance and repair costs of the energy storage system.

[0007] In some embodiments, performing charge and discharge on each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system includes: when it is determined that the energy storage system is in a charging state, charging each battery cluster according to the charging priority of each battery cluster in the energy storage system; when it is determined that the energy storage system is in a discharging state, discharging each battery cluster according to the discharging priority of each battery cluster in the energy storage system.

[0008] In this way, charging and discharging each battery cluster according to the charging priority and discharging priority of each battery cluster can ensure that the battery clusters with higher priority are charged first, and the energy balance and normal use of the energy storage system are maintained as much as possible.

[0009] In some embodiments, charging each battery cluster according to the charging priority of each battery cluster in the energy storage system includes: obtaining the unallocated charging power of the energy management system of the energy storage system; when it is determined that the unallocated charging power is greater than or equal to the charging power limit of the battery cluster with the first charging priority, using the unallocated charging power to fully charge each single battery cell in the battery cluster with the first charging priority, where the charging power limit of each battery cluster is determined based on the charging power limits of the single battery cells in the battery cluster; when it is determined that the unallocated charging power is less than the charging power limit of the battery cluster with the first charging priority, using the unallocated charging power to evenly charge each single battery cell in the battery cluster with the first charging priority.

[0010] In this way, according to the unallocated charging power of the energy management system of the energy storage system, when it is determined that the unallocated charging power is greater than or equal to the charging power limit of the battery cluster with the first charging priority, using the unallocated charging power to fully charge each single battery cell in the battery cluster with the first charging priority. In this way, when the unallocated charging power can fully charge the battery cluster with the first charging priority, the battery cluster with the first charging priority can be fully charged, ensuring the high-quality operation of the energy storage system. When it is determined that the unallocated charging power is less than the charging power limit of the battery cluster with the first charging priority, using the unallocated charging power to evenly charge each single battery cell in the battery cluster with the first charging priority. In this way, it is ensured that each battery cell in the battery cluster with the first charging priority can be charged to a certain extent, ensuring the normal operation of the energy storage system and avoiding the impact on the life of the entire energy storage system caused by a single battery cluster not being charged.

[0011] In some embodiments, using the unallocated charging power to evenly charge each single battery cell in the battery cluster with the first charging priority includes: obtaining the first quantity of each single battery cell in the battery cluster with the first charging priority; based on the first quantity, dividing the unallocated charging power into M equal parts to obtain the divided unallocated charging power, where M is equal to the first quantity; using the divided unallocated charging power to evenly charge each single battery cell in the battery cluster with the first charging priority.

[0012] In this way, the unallocated charging power is evenly distributed according to the number of battery clusters with the first charging priority and used to charge the battery clusters with the first charging priority on average, ensuring that each battery cluster with the first charging priority can be charged, maintaining the energy balance of the entire energy storage system, and avoiding the impact on the life of the entire energy storage system caused by a single battery cluster not being charged.

[0013] In some embodiments, discharging each battery cluster according to the discharge priority of each battery cluster in the energy storage system includes: obtaining the undistributed discharge power of the energy management system of the energy storage system; when it is determined that the undistributed discharge power is greater than or equal to the discharge power limit value of the battery cluster with the first discharge priority, fully discharging each single cell in the battery cluster with the first discharge priority by using the undistributed discharge power, where the discharge power limit value of each battery cluster is determined based on the discharge power limit values of the single cells in the battery cluster; when it is determined that the undistributed discharge power is less than the discharge power limit value of the battery cluster with the first discharge priority, uniformly discharging each single cell in the battery cluster with the first discharge priority by using the undistributed discharge power.

[0014] In this way, according to the undistributed discharge power, when it is determined that the undistributed discharge power is greater than or equal to the discharge power limit value of the battery cluster with the first discharge priority, the battery cluster with the first discharge priority is fully discharged by using the undistributed discharge power. In this way, when the undistributed discharge power can fully discharge the battery cluster with the first discharge priority, the power in the battery cluster with the first discharge priority can be fully discharged, ensuring the high-quality operation of the energy storage system. When it is determined that the undistributed discharge power is less than the discharge power limit value of the battery cluster with the first discharge priority, the battery cluster with the first discharge priority is uniformly discharged by using the undistributed discharge power. In this way, it is ensured that the battery cluster with the first discharge priority can all be discharged to a certain extent, ensuring the normal operation of the energy storage system and avoiding the situation that a single battery cluster is not discharged, which affects the life of the entire energy storage system.

[0015] In some embodiments, uniformly discharging each single cell in the battery cluster with the first discharge priority by using the undistributed discharge power includes: obtaining the second quantity of each single cell in the battery cluster with the first discharge priority; based on the second quantity, equally dividing the undistributed discharge power into N parts, where N is equal to the second quantity, to obtain the equally divided undistributed discharge power; and uniformly discharging each single cell in the battery cluster with the first discharge priority by using the equally divided undistributed discharge power.

[0016] In this way, the undistributed discharge power is evenly distributed according to the number of battery clusters with the first discharge priority and is used for discharging the battery clusters with the first discharge priority on average. In this way, it is ensured that the battery clusters with the first discharge priority can all be discharged, maintaining the energy balance of the entire energy storage system and avoiding the situation that a single battery cluster is not discharged, which affects the life of the entire energy storage system.

[0017] Second aspect, an embodiment of the present application provides an energy management method for an energy storage system. This method is applied to a controller and includes: obtaining the electrical parameter information of each battery cluster in the energy storage system; determining the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information; and sending the charge-discharge priorities of each battery cluster in the energy storage system to the energy storage converter so that the energy storage converter charges and discharges each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

[0018] Thus, the controller obtains the electrical parameter information of each battery cluster in the energy storage system, then determines the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information, and sends the charge-discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter can obtain the accurate charge-discharge priorities of each battery cluster in the energy storage system. Furthermore, it can charge and discharge each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system, thereby improving the accuracy of charging and discharging each battery cluster in the energy storage system.

[0019] In some embodiments, the electrical parameter information of each battery cluster includes the state of charge of the battery cluster, the charging power limit, the discharging power limit, the correction state of the state of charge, the number of charge cycles, and the number of discharge cycles. Determining the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information includes: determining the charging priorities of each battery cluster in the energy storage system according to the state of charge of the battery cluster, the charging power limit, the correction state of the state of charge, and the number of charge cycles; and determining the discharging priorities of each battery cluster in the energy storage system according to the state of charge of the battery cluster, the discharging power limit, the correction state of the state of charge, and the number of discharge cycles.

[0020] In this way, according to the electrical parameter information of each battery cluster, the charging priorities and discharging priorities of each battery cluster can be accurately determined, so as to charge and discharge each battery cluster based on the charging priorities and discharging priorities of each battery cluster, thereby improving the accuracy of charging and discharging each battery cluster in the energy storage system.

[0021] In some embodiments, determining the charging priorities of the battery clusters in the energy storage system according to the state of charge, the charging power limit, the correction state of the state of charge, and the number of charging cycles of the battery clusters includes: when determining that the state of charge of the first battery cluster is less than the first threshold, determining that the charging priority of the first battery cluster is the first charging priority, where the first battery cluster is any one of the battery clusters in the energy storage system; when determining that the state of charge of the first battery cluster is not less than the first threshold and the correction state of the state of charge of the first battery cluster is the uncorrected state, determining that the charging priority of the first battery cluster is the second charging priority; when determining that the state of charge of the first battery cluster is not less than the first threshold, the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster meets the condition for charging, determining that the charging priority of the first battery cluster is the third charging priority; when determining that the state of charge of the first battery cluster is not less than the first threshold, the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, the state of charge of the first battery cluster does not meet the condition for charging, and the historical charging cycle number of the first battery cluster is less than the preset charging cycle number, determining that the charging priority of the first battery cluster is the fourth charging priority, where the preset charging cycle number is the average value of the charging cycle numbers of the battery clusters in the energy storage system; when determining that the state of charge of the first battery cluster is not less than the first threshold, the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, the state of charge of the first battery cluster does not meet the condition for charging, the historical charging cycle number of the first battery cluster is not less than the preset charging cycle number, and the charging power limit of the first battery cluster is the preset charging power limit, determining that the charging priority of the first battery cluster is the fifth charging priority, where the preset charging power limit is the maximum value of the charging power limits of the battery clusters in the energy storage system; when determining that the state of charge of the first battery cluster is not less than the first threshold, the correction state of the state of charge of the first battery cluster is not the uncorrected state, the state of charge of the first battery cluster does not meet the condition for charging, the historical charging cycle number of the first battery cluster is not less than the preset charging cycle number, and the charging power limit of the first battery cluster is not the preset charging power limit, determining that the charging priority of the first battery cluster is the sixth charging priority; where the priority levels of the first charging priority, the second charging priority, the third charging priority, the fourth charging priority, the fifth charging priority, and the sixth charging priority decrease in sequence.

[0022] In this way, by according to the state of charge, the charging power limit, the correction state of the state of charge, and the number of charging cycles of the battery clusters, the charging priorities of the battery clusters in the energy storage system can be accurately determined.

[0023] In some embodiments, determining the discharge priority of each battery cluster in the first distributed energy storage system according to the state of charge of the battery cluster, the discharge power limit, the correction state of the state of charge, and the number of discharge cycles includes: when determining that the correction state of the state of charge of the first battery cluster is the uncorrected state, determining the discharge priority of the first battery cluster as the first discharge priority, where the first battery cluster is any one of the battery clusters in the energy storage system; when determining that the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster is in the condition that discharge is required, determining the discharge priority of the first battery cluster as the second discharge priority; when determining that the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster is not in the condition that discharge is required, and the historical discharge cycle number of the first battery cluster is less than the preset discharge cycle number, determining the discharge priority of the first battery cluster as the third discharge priority, where the preset discharge cycle number is the average value of the discharge cycle numbers of each battery cluster in the first distributed energy storage system;

[0024] When determining that the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster is not in the condition that discharge is required, and the historical discharge cycle number of the first battery cluster is not less than the preset discharge cycle number, and the discharge power limit of the first battery cluster is the preset discharge power limit, determining the discharge priority of the first battery cluster as the fourth discharge priority, where the preset discharge power limit is the maximum value of the discharge power limits of each battery cluster in the energy storage system; when determining that the correction state of the state of charge of the first battery cluster is not the uncorrected state, and the state of charge of the first battery cluster is not in the condition that discharge is required, and the historical discharge cycle number of the first battery cluster is not less than the preset discharge cycle number, and the discharge power limit of the first battery cluster is not the preset discharge power limit, determining the discharge priority of the first battery cluster as the fifth discharge priority; where the priority levels of the first discharge priority, the second discharge priority, the third discharge priority, the fourth discharge priority, and the fifth discharge priority decrease in sequence.

[0025] Thus, by according to the state of charge of the battery cluster, the discharge power limit, the correction state of the state of charge, and the number of discharge cycles, the discharge priority of each battery cluster in the energy storage system can be accurately determined.

[0026] In a third aspect, an energy management device for an energy storage system provided by an embodiment of the present application. The energy storage system includes a plurality of battery clusters. The device is applied to an energy storage converter, and the energy storage converter corresponds to each battery cluster one by one. The device includes: a receiving module, configured to receive the charge-discharge priorities of each battery cluster in the energy storage system sent by a controller; a charge-discharge module, configured to perform charge and discharge on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

[0027] Thus, the energy storage converter receives the charge-discharge priorities of each battery cluster in the energy storage system sent by the controller, and then performs charge and discharge on each battery cluster in the energy storage system according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system. In this way, the charge and discharge are not carried out with the energy storage system as a whole, but are based on each battery cluster in the energy storage system, which will not cause the problem that the frequent replacement of battery clusters is caused by the uneven energy in each battery cluster in the energy storage system, affecting the service life of the battery clusters. The solution of the embodiment of the present application realizes the charge and discharge of each battery cluster in a single distributed energy storage system, and reduces the maintenance and repair costs of the energy storage system.

[0028] In a fourth aspect, an energy management device for an energy storage system provided by an embodiment of the present application. The device is applied to a controller. The device includes: an acquisition module, configured to acquire the electrical parameter information of each battery cluster in the energy storage system; a determination module, configured to determine the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information; a sending module, configured to send the charge-discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter performs charge and discharge on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

[0029] Thus, the controller acquires the electrical parameter information of each battery cluster in the energy storage system, then determines the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information, and sends the charge-discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter can obtain the accurate charge-discharge priorities of each battery cluster in the energy storage system, and further can perform charge and discharge on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system, thereby improving the accuracy of the charge and discharge of each battery cluster in the energy storage system.

[0030] In a fifth aspect, an embodiment of the present application provides an energy management system for an energy storage system. The system includes: a controller configured to obtain electrical parameter information of each battery cluster in the energy storage system; determine the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information; and send the charge-discharge priorities of each battery cluster in the energy storage system to a power conversion system for energy storage. The power conversion system for energy storage is configured to receive the charge-discharge priorities of each battery cluster in the energy storage system sent by the controller, and perform charge and discharge on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

[0031] Thus, the controller obtains the electrical parameter information of each battery cluster in the energy storage system, then determines the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information, and sends the charge-discharge priorities of each battery cluster in the energy storage system to the power conversion system for energy storage, so that the power conversion system for energy storage can obtain the accurate charge-discharge priorities of each battery cluster in the energy storage system. Furthermore, the power conversion system for energy storage can perform charge and discharge on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system, thereby improving the accuracy of charge and discharge of each battery cluster in the energy storage system. In addition, when the power conversion system for energy storage performs charge and discharge on each battery cluster in the energy storage system, it does not perform charge and discharge on the energy storage system as a whole, but performs charge and discharge based on each battery cluster in the energy storage system, which can avoid the problem of frequent replacement of battery clusters caused by uneven energy in each battery cluster in the energy storage system and affect the service life of the battery clusters. It realizes the charge and discharge of each battery cluster in a single distributed energy storage system and reduces the maintenance and repair costs of the energy storage system.

[0032] In a sixth aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, it implements the energy management method of the energy storage system shown in any one of the embodiments of the first aspect, and / or the energy management method of the energy storage system shown in any one of the embodiments of the second aspect.

[0033] In a seventh aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, it implements the energy management method of the energy storage system shown in any one of the embodiments of the first aspect, and / or the energy management method of the energy storage system shown in any one of the embodiments of the second aspect.

[0034] In an eighth aspect, an embodiment of the present application provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device is caused to execute the energy management method of the energy storage system shown in any one of the embodiments of the first aspect, and / or the energy management method of the energy storage system shown in any one of the embodiments of the second aspect.

[0035] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specific embodiments of this application are specifically given. Description of the Drawings

[0036] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0037] Figure 1 is a schematic structural diagram of a distributed energy storage system provided by some embodiments of this application;

[0038] Figure 2 is a schematic structural diagram of an energy management system of an energy storage system provided by some embodiments of this application;

[0039] Figure 3 is one of the schematic flowcharts of an energy management method of an energy storage system provided by some embodiments of this application;

[0040] Figure 4 is a schematic flowchart of charging each battery cluster in an energy storage system provided by some embodiments of this application;

[0041] Figure 5 is a schematic flowchart of discharging each battery cluster in an energy storage system provided by some embodiments of this application;

[0042] Figure 6 is another schematic flowchart of an energy management method of an energy storage system provided by some embodiments of this application;

[0043] Figure 7 is one of the schematic structural diagrams of an energy management device of an energy storage system provided by some embodiments of this application;

[0044] Figure 8 is another schematic structural diagram of an energy management device of an energy storage system provided by some embodiments of this application;

[0045] Figure 9 is a schematic structural diagram of an electronic device provided by some embodiments of this application. Detailed Embodiments

[0046] The embodiments of the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0047] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0048] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0049] In addition, technical terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two unless otherwise specifically defined.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height than the second feature.

[0052] Before introducing the embodiments of the present application, the background art of the embodiments of the present application will be introduced first:

[0053] There are multiple distributed energy storage systems within the same target wide area network. Each distributed energy storage system includes multiple battery clusters, and each battery cluster includes multiple battery packs.

[0054] Currently, when performing energy management on each distributed energy storage system within the same target wide area network, it is usually to charge and discharge each distributed energy storage system, so as to realize the energy management of each distributed energy storage system. Specifically, it can classify each distributed energy storage system and sort its priority according to the output data, energy generation data, and load data of each distributed energy storage system, and then charge and discharge each distributed energy storage system according to the category and priority of each distributed energy storage system.

[0055] The above energy management method for each distributed energy storage system is an energy management method at the system level, and does not describe in detail how to perform energy balance management between single battery clusters in a single distributed energy storage system. Since in the market for the distributed energy storage side architecture, it is connected to the power grid in the form of a container, the above energy management method only considers the energy balance of the entire distributed energy storage system and does not consider the energy balance of a single battery cluster. This will cause the distributed energy storage system to be unable to meet the client load demand in time due to the low energy of a single cluster of batteries, resulting in a decrease in the overall service life of the distributed energy storage system. At the same time, it will cause the client to replace single clusters of batteries frequently, increasing the maintenance and repair costs of the distributed energy storage.

[0056] To solve the above problems, the embodiments of the present application provide an energy management method, device, and system for an energy storage system. The energy storage converter receives the charge and discharge priorities of each battery cluster in the energy storage system sent by the controller, and then charges and discharges each battery cluster in the energy storage system according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system. In this way, charging and discharging are not carried out with the energy storage system as a whole, but are based on each battery cluster in the energy storage system, which will not cause the problem that the frequent replacement of battery clusters due to uneven energy in each battery cluster in the energy storage system affects the service life of the battery cluster. The solution of the embodiments of the present application realizes the charging and discharging of each battery cluster in a single energy storage system, reducing the maintenance and repair costs of the energy storage system.

[0057] Before introducing the energy management method for the energy storage system provided by the embodiments of the present application, the system architecture corresponding to the energy management method for the energy storage system of the embodiments of the present application will be introduced first.

[0058] Figure 1 The schematic diagram of the architecture of a distributed energy storage system provided by an embodiment of the present application is shown, asFigure 1 As shown, the distributed energy storage system may include an AC side 110 and a DC side 120.

[0059] The AC side here includes a plurality of power conversion systems (PCS), and the DC side has a plurality of electric cabinets. The PCSs are in one-to-one correspondence with the electric cabinets on the DC side. Each electric cabinet includes a battery cluster, and each battery cluster includes a plurality of battery packs. Each PCS is used to control the charge and discharge of the battery cluster in its corresponding electric cabinet.

[0060] In Figure 1 each electric cabinet has its corresponding battery management system (BMS).

[0061] Then, an energy management system of the energy storage system for implementing the energy management method of the energy storage system of the present application embodiment is introduced.

[0062] Figure 2 The schematic structural diagram of an energy management system provided by an embodiment of the present application is shown. As Figure 2 shown, the energy management system may include: a controller 210 and a power conversion system 220.

[0063] The controller 210 is configured to obtain the electrical parameter information of each battery cluster in the energy storage system; determine the charge and discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information; and send the charge and discharge priorities of each battery cluster in the energy storage system to the power conversion system.

[0064] The power conversion system 220 is configured to receive the charge and discharge priorities of each battery cluster in the energy storage system sent by the controller 210, and charge and discharge each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system.

[0065] Among them, the controller may be the total controller of the energy storage system.

[0066] The electrical parameter information may be information describing the electrical parameters of the battery cluster, and may include, but is not limited to: the state of charge (SOC) of the battery cluster, the charging power limit, the discharging power limit, the correction state of the state of charge, the charging cycle number, and the discharging cycle number.

[0067] The charging priority may be to sort the charging orders of each battery cluster to obtain the charging priorities of each battery cluster.

[0068] The discharging priority may be to sort the discharging orders of each battery cluster to obtain the discharging priorities of each battery cluster.

[0069] For an energy storage system, each battery cluster therein has its corresponding controller, and then there is also a controller that controls all the battery clusters, and this controller is the master controller. For the controller corresponding to a certain battery cluster, it can collect the electrical parameter information of its corresponding battery cluster, and then this controller sends the parameter information it collects to the master controller. After the master controller collects the electrical parameter information sent by the controllers corresponding to each battery cluster, it determines the charging priority and discharging priority of each battery cluster in the energy storage system according to the electrical parameter information, and sends the charging priority and discharging priority of each battery cluster in the energy storage system to the energy storage inverter 220. Specifically, how to determine the charging and discharging priorities of each battery cluster in the energy storage system according to the electrical parameter information will be introduced in detail in the subsequent embodiments.

[0070] After the energy storage inverter 220 receives the charging and discharging priorities of each battery cluster in the energy storage system sent by the controller 210, it charges and discharges each battery cluster according to the charging and discharging state of the energy storage system and the charging and discharging priorities of each battery cluster in the energy storage system. Specifically, how the energy storage inverter 220 charges and discharges each battery cluster according to the charging and discharging state of the energy storage system and the charging and discharging priorities of each battery cluster in the energy storage system will be introduced in detail in the subsequent embodiments.

[0071] In the embodiments of the present application, the electrical parameter information of each battery cluster in the energy storage system is obtained through the controller, and then the charging and discharging priorities of each battery cluster in the energy storage system are determined according to the electrical parameter information, and the charging and discharging priorities of each battery cluster in the energy storage system are sent to the energy storage inverter, so that the energy storage inverter can obtain the accurate charging and discharging priorities of each battery cluster in the energy storage system, and then can charge and discharge each battery cluster according to the charging and discharging state of the energy storage system and the charging and discharging priorities of each battery cluster in the energy storage system, thereby improving the accuracy of charging and discharging each battery cluster in the energy storage system. In addition, when the energy storage inverter charges and discharges each battery cluster in the energy storage system, it does not charge and discharge the energy storage system as a whole, but charges and discharges based on each battery cluster in the energy storage system, which will not cause the problem that the energy in each battery cluster in the energy storage system is uneven, resulting in frequent replacement of battery clusters and affecting the service life of the battery clusters, realizing the charging and discharging of each battery cluster in a single distributed energy storage system, and reducing the maintenance and repair costs of the energy storage system.

[0072] The following combines Figure 3 to elaborate in detail on the energy management method of the energy storage system provided by the embodiments of the present application.

[0073] Figure 3 shows a schematic flowchart of an energy management method for an energy storage system provided by an embodiment of the present application. It should be noted that this energy management method for the energy storage system can be applied to the above-mentioned Figure 2 energy storage inverter 220.

[0074] The above energy storage converters correspond one-to-one with the electric cabinets, and one electric cabinet may include one battery cluster in the energy storage system. The energy storage system here may be any one of at least one distributed energy storage system in the target wide area network. The target wide area network here may be a local area network that needs to charge and discharge the distributed energy storage system in the local area network.

[0075] As Figure 3 shown, the energy management method of the energy storage system may include the following steps:

[0076] S310. Receive the charge and discharge priorities of each battery cluster in the energy storage system sent by the controller.

[0077] S320. Charge and discharge each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system.

[0078] Thus, by receiving the charge and discharge priorities of each battery cluster in the energy storage system sent by the controller through the energy storage converter, and then charging and discharging each battery cluster in the energy storage system according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system, instead of charging and discharging the energy storage system as a whole, but based on each battery cluster in the energy storage system, it will not cause the problem of frequent replacement of battery clusters due to uneven energy in each battery cluster in the energy storage system, which affects the service life of the battery cluster. The solution of the embodiment of the present application realizes the charging and discharging of each battery cluster in a single energy storage system, and reduces the maintenance and repair costs of the energy storage system.

[0079] Regarding S320, in order to further perform energy balance management on each battery cluster, S320 may specifically include:

[0080] When it is determined that the energy storage system is in the charging state, charge each battery cluster according to the charging priority of each battery cluster in the energy storage system;

[0081] When it is determined that the energy storage system is in the discharging state, discharge each battery cluster according to the discharging priority of each battery cluster in the energy storage system.

[0082] In some embodiments, since when determining the charging priority and discharging priority of each battery cluster, it is generally determined based on the urgency of charging and discharging of each battery cluster, so when it is determined that the energy storage system is in the charging state, each battery cluster can be charged according to the charging priority of each battery cluster in the energy storage system, and when it is determined that the energy storage system is in the discharging state, each battery cluster can be discharged according to the discharging priority of each battery cluster in the energy storage system.

[0083] In this way, charging and discharging each battery cluster according to the charging priority and discharging priority of each battery cluster can ensure that the battery clusters with higher priority are charged first, and the energy balance and normal use of the energy storage system are maintained as much as possible.

[0084] In some embodiments, in order to accurately charge each battery cluster, charging each battery cluster according to the charging priority of each battery cluster in the energy storage system may specifically include:

[0085] Obtain the unallocated charging power of the energy management system of the energy storage system;

[0086] When it is determined that the unallocated charging power is greater than or equal to the charging power limit of the battery clusters with the first charging priority, use the unallocated charging power to fully charge each single cell in the battery clusters with the first charging priority;

[0087] When it is determined that the unallocated charging power is less than the charging power limit of the battery clusters with the first charging priority, use the unallocated charging power to evenly charge each single cell in the battery clusters with the first charging priority.

[0088] Among them, the unallocated charging power may be the charging power that has not been allocated by the energy management system of the energy storage system.

[0089] It should be noted that when the first charging priority is the highest charging priority, the unallocated charging power here is the total charging power of the station-level energy management system (Energy Management System, EMS) of the energy storage system. When the first charging priority is not the highest charging priority, the unallocated charging power here is the remaining charging power after the EMS of the energy storage system fully charges the battery clusters with the previous charging priority of the first charging priority. That is, when charging the battery clusters with the next charging priority, the remaining charging power after charging the previous charging priority is used.

[0090] The first charging priority can be any one of the charging priorities.

[0091] The charging power limit of the battery clusters with the first charging priority can be the maximum charging power that the battery clusters with the first charging priority can charge.

[0092] For a certain battery cluster, its charging power limit is determined based on the charging power limits of each individual battery cell in the battery cluster. Specifically, the charging power limit of the battery cluster can be the maximum value of the charging power limits of each individual battery cell in the battery cluster, or the average value of the charging power limits of each individual battery cell in the battery cluster, or the minimum value of the charging power limits of each individual battery cell in the battery cluster. Specifically, the determination of the charging power limit of the battery cluster can be set according to user needs and is not limited in the embodiments of the present application.

[0093] In some embodiments, when it is determined that the unallocated charging power is greater than or equal to the charging power limit of the battery cluster with the first charging priority, the unallocated charging power is used to fully charge each individual battery cell in the battery cluster with the first charging priority, that is, the battery cluster with the first charging priority is fully charged using the unallocated charging power.

[0094] In one example, taking the first charging priority as the highest charging priority, if the unallocated charging power of the EMS is 100 MW and the charging power limit of the battery cluster with the first charging priority is 30 MW, then this 100 MW is used to fully charge the battery cluster with the first charging priority, that is, the battery cluster with the first charging priority is fully charged, and then the remaining charging power is used to charge the battery cluster with the next charging priority after the first charging priority.

[0095] In some embodiments, when it is determined that the unallocated charging power is less than the charging power limit of the battery cluster with the first charging priority, the unallocated charging power is used to evenly charge each individual battery cell in the battery cluster with the first charging priority, that is, the unallocated charging power cannot fully charge each individual battery cell in the battery cluster with the first charging priority.

[0096] In one example, taking the first charging priority as the highest charging priority, if the unallocated charging power of the EMS is 100 MW and the charging power limit of the battery cluster with the first charging priority is 130 MW, then this 100 MW is used to evenly charge the battery cluster with the first charging priority, that is, each individual battery cell in the battery cluster with the first charging priority cannot be fully charged.

[0097] In some embodiments, referring to Figure 4 , Figure 4 For a schematic diagram of charging each battery cluster, taking the charging priority having two levels as an example, the charging process includes the following steps:

[0098] S401. Determine whether the unallocated charging power of the energy management system of the energy storage system is greater than or equal to the charging power limit of the charging battery cluster with the first charging priority. If so, execute S402; if not, execute S403.

[0099] S402. Use the unallocated charging power of the energy management system to fully charge each single battery cell in the primary charging battery cluster.

[0100] S403. Use the unallocated charging power of the energy management system to evenly charge each single battery cell in the primary charging battery cluster.

[0101] S404. Calculate the difference between the unallocated charging power of the energy management system and the charging power limit of the primary charging battery cluster to obtain the primary unallocated charging power.

[0102] S405. Determine whether the primary unallocated charging power is greater than or equal to the charging power limit of the charging battery cluster with a secondary charging priority. If so, execute S406; if not, execute S407.

[0103] S406. Use the primary unallocated charging power to fully charge each single battery cell in the secondary charging battery cluster.

[0104] S407. Use the primary unallocated charging power to evenly charge each single battery cell in the secondary charging battery cluster.

[0105] In the case of having battery clusters of other charging levels, the difference between the primary unallocated charging power and the charging power limit of the secondary charging battery cluster can be continuously calculated to obtain the secondary unallocated charging power, and then the process of S401 - S403 above is executed.

[0106] In this way, according to the unallocated charging power of the energy management system of the energy storage system, when it is determined that the unallocated charging power is greater than or equal to the charging power limit of the battery cluster with the first charging priority, the unallocated charging power is used to fully charge each single battery cell in the battery cluster with the first charging priority respectively. In this way, when the unallocated charging power can fully charge the battery cluster with the first charging priority, the battery cluster with the first charging priority can be fully charged, ensuring the high-quality operation of the energy storage system. When it is determined that the unallocated charging power is less than the charging power limit of the battery cluster with the first charging priority, the unallocated charging power is used to evenly charge each single battery cell in the battery cluster with the first charging priority. In this way, it is determined that each battery cell in the battery cluster with the first charging priority can be charged partially, ensuring the normal operation of the energy storage system and avoiding the situation that a single battery cluster is not charged, which affects the life of the entire energy storage system.

[0107] In some embodiments, in order to further better manage the energy of each battery cluster, the step of using the unallocated charging power to evenly charge each single battery cell in the battery cluster with the first charging priority may specifically include:

[0108] Obtain the first quantity of each single battery cell in the battery cluster with the first charging priority;

[0109] Based on the first quantity, equally divide the unallocated charging power into M parts to obtain the equally divided unallocated charging power, where M is equal to the first quantity;

[0110] Use the equally divided unallocated charging power to uniformly charge each single battery cell in the battery cluster with the first charging priority.

[0111] Among them, the first quantity can be the number of single battery cells in the battery cluster with the first charging priority.

[0112] In some embodiments, based on the first quantity, the unallocated charging power can be equally divided into M parts, where M is equal to the first quantity, to obtain the equally divided unallocated charging power, and then use the equally divided unallocated charging power to uniformly charge each single battery cell in the battery cluster with the first charging priority.

[0113] In one example, taking the first charging priority as the highest charging priority, if the unallocated charging power of the EMS is 100 MW, the charging power limit of the battery cluster with the first charging priority is 130 MW, and there are 5 single battery cells in the battery cluster with the first charging priority, then use this 100 MW to be evenly divided into 5 parts, and the equally divided unallocated charging power is 20 MW for each part. Then use each part of the charging power to charge the 5 single battery cells in the battery cluster with the first charging priority, that is, each single battery cell is charged with 10 MW of power.

[0114] In this way, the unallocated charging power is evenly distributed according to the number of battery clusters with the first charging priority and is evenly used to charge the battery clusters with the first charging priority, thus ensuring that the battery clusters with the first charging priority can all be charged, maintaining the energy balance of the entire energy storage system, and avoiding the situation that a single battery cluster is not charged, which affects the life of the entire energy storage system.

[0115] In some embodiments, in order to accurately discharge each battery cluster, discharging each battery cluster according to the discharge priority of each battery cluster in the energy storage system includes:

[0116] Obtain the unallocated discharge power of the energy management system of the energy storage system;

[0117] When it is determined that the unallocated discharge power is greater than or equal to the discharge power limit of the battery cluster with the first discharge priority, use the unallocated discharge power to fully discharge each single battery cell in the battery cluster with the first discharge priority, where the discharge power limit of each battery cluster is determined based on the discharge power limits of the single battery cells in the battery cluster;

[0118] When it is determined that the undistributed discharge power is less than the discharge power limit of the battery cluster with the first discharge priority, the undistributed discharge power is used to uniformly discharge each single cell in the battery cluster with the first discharge priority.

[0119] Among them, the undistributed discharge power can be the undistributed discharge power of the energy management system of the energy storage system.

[0120] It should be noted that when the first discharge priority is the highest discharge priority, the undistributed discharge power here is the total discharge power of the EMS of the energy storage system. When the first discharge priority is not the highest discharge priority, the undistributed discharge power is the remaining discharge power after the EMS of the energy storage system fully charges the battery cluster with the previous discharge priority of the first discharge priority. That is, when discharging the battery cluster with the next discharge priority, the remaining discharge power after discharging the previous discharge priority is used.

[0121] The first discharge priority can be any priority in the discharge priorities.

[0122] The discharge power limit of the battery cluster with the first discharge priority can be how much power the battery cluster with the first discharge priority can discharge at most.

[0123] For a certain battery cluster, its discharge power limit is determined based on the discharge power limits of each single cell in the battery cluster. Specifically, the discharge power limit of the battery cluster can be the maximum value of the discharge power limits of each single cell in the battery cluster, or the average value of the discharge power limits of each single cell in the battery cluster, or the minimum value of the discharge power limits of each single cell in the battery cluster. Specifically, the determination of the discharge power limit of the battery cluster can be set according to user needs and is not limited in the embodiments of the present application.

[0124] In some embodiments, when it is determined that the undistributed discharge power is greater than or equal to the discharge power limit of the battery cluster with the first discharge priority, the undistributed discharge power is used to fully discharge each single cell in the battery cluster with the first discharge priority, that is, the undistributed discharge power is used to fully discharge the battery cluster with the first discharge priority.

[0125] In an example, taking the first discharge priority as the highest discharge priority as an example, if the undistributed discharge power of the EMS is 100 megawatts and the discharge power limit of the battery cluster with the first discharge priority is 30 megawatts, then these 100 megawatts are used to fully discharge the battery cluster with the first discharge priority, that is, the battery cluster with the first discharge priority is fully discharged, and then the remaining discharge power is used to discharge the battery cluster with the next discharge priority of the first discharge priority.

[0126] In some embodiments, when it is determined that the unallocated discharge power is less than the discharge power limit of the battery cluster with the first discharge priority, the unallocated discharge power is used to uniformly discharge each single cell in the battery cluster with the first discharge priority, that is, the unallocated discharge power cannot fully discharge each single cell in the battery cluster with the first discharge priority.

[0127] In one example, taking the first discharge priority as the highest discharge priority, if the unallocated discharge power of the EMS is 100 MW and the discharge power limit of the battery cluster with the first discharge priority is 130 MW, then this 100 MW is used to evenly discharge the battery cluster with the first discharge priority, that is, each single cell in the battery cluster with the first discharge priority cannot be fully discharged.

[0128] In some embodiments, referring to Figure 5 , Figure 5 FIG. is a schematic diagram of discharging each battery cluster. Taking the example that there are two levels of discharge priorities, the discharging process includes the following steps:

[0129] S501. Determine whether the unallocated discharge power of the energy management system of the energy storage system is greater than or equal to the discharge power limit of the discharging battery cluster with the first-level discharge priority. If so, execute S402; if not, execute S403.

[0130] S502. Use the unallocated discharge power of the energy management system to fully discharge each single cell in the first-level discharging battery cluster.

[0131] S503. Use the unallocated discharge power of the energy management system to uniformly discharge each single cell in the first-level discharging battery cluster.

[0132] S504. Calculate the difference between the unallocated discharge power of the energy management system and the discharge power limit of the first-level discharging battery cluster to obtain the first-level unallocated discharge power.

[0133] S505. Determine whether the first-level unallocated discharge power is greater than or equal to the discharge power limit of the discharging battery cluster with the second-level discharge priority. If so, execute S406; if not, execute S407.

[0134] S506. Use the first-level unallocated discharge power to fully discharge each single cell in the second-level discharging battery cluster.

[0135] S507. Use the first-level unallocated discharge power to uniformly discharge each single cell in the second-level discharging battery cluster.

[0136] In the case where there are other levels of discharge battery clusters, the difference between the unallocated discharge power at one level and the discharge power limit of the battery clusters at the second level can be continuously calculated to obtain the unallocated discharge power at the second level, and then the process of S501 - S503 described above is executed.

[0137] In this way, according to the unallocated discharge power, when it is determined that the unallocated discharge power is greater than or equal to the discharge power limit of the battery clusters with the first discharge priority, the unallocated discharge power is used to fully discharge the battery clusters with the first discharge priority respectively. In this way, when the unallocated discharge power can fully discharge the battery clusters with the first discharge priority, the power in the battery clusters with the first discharge priority can be fully discharged, ensuring the high-quality operation of the energy storage system. When it is determined that the unallocated discharge power is less than the discharge power limit of the battery clusters with the first discharge priority, the unallocated discharge power is used to uniformly discharge the battery clusters with the first discharge priority. In this way, it is determined that all the battery clusters with the first discharge priority can be partially discharged to ensure the normal operation of the energy storage system and avoid the situation that a single battery cluster is not discharged, which affects the life of the entire energy storage system.

[0138] In some embodiments, in order to further better manage the energy of each battery cluster, the uniform discharge of each single cell in the battery clusters with the first discharge priority using the unallocated discharge power may specifically include:

[0139] Obtain the second quantity of each single cell in the battery clusters with the first discharge priority;

[0140] Based on the second quantity, divide the unallocated discharge power into N equal parts to obtain the divided unallocated discharge power, where N is equal to the second quantity;

[0141] Use the divided unallocated discharge power to uniformly discharge each single cell in the battery clusters with the first discharge priority.

[0142] Among them, the second quantity may be the number of single cells in the battery clusters with the first discharge priority.

[0143] In some embodiments, based on the second quantity, the unallocated discharge power can be divided into N equal parts, where N is equal to the second quantity, to obtain the divided unallocated discharge power, and then the divided unallocated discharge power is used to uniformly discharge the single cells in the battery clusters with the first discharge priority respectively.

[0144] In one example, taking the first discharge priority as the highest discharge priority, if the unallocated discharge power of the EMS is 100 MW, the discharge power limit of the battery cluster with the first discharge priority is 130 MW, and there are 5 single cells in the battery cluster with the first discharge priority, then the 100 MW is evenly divided into 5 parts. After equal division, the unallocated discharge power is 20 MW for each part. Then, each of the 5 single cells in the battery cluster with the first discharge priority is discharged using the discharge power of each part, that is, each single cell is discharged with a power of 10 MW.

[0145] In this way, the unallocated discharge power is evenly distributed according to the number of battery clusters with the first discharge priority, and the battery clusters with the first discharge priority are evenly discharged, thus ensuring that the battery clusters with the first discharge priority can all discharge electricity, maintaining the energy balance of the entire energy storage system, and avoiding the situation where a single battery cluster does not discharge, which affects the lifespan of the entire energy storage system.

[0146] The following Figure 6 will be used to elaborate in detail on the energy management method of the energy storage system provided in the embodiments of the present application.

[0147] Figure 6 shows a schematic flowchart of an energy management method of an energy storage system provided in an embodiment of the present application. It should be noted that this energy management method of the energy storage system can be applied to the above Figure 2 controller 210.

[0148] As Figure 6 shown, this energy management method of the energy storage system may include the following steps:

[0149] S610. Obtain the electrical parameter information of each battery cluster in the energy storage system.

[0150] S620. Determine the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information.

[0151] S630. Send the charge-discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter charges and discharges each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

[0152] Accordingly, the controller obtains the electrical parameter information of each battery cluster in the energy storage system, and then determines the charge and discharge priorities of each battery cluster in the energy storage system based on the electrical parameter information, and sends the charge and discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter can obtain the accurate charge and discharge priorities of each battery cluster in the energy storage system. Furthermore, the charge and discharge of each battery cluster can be performed according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system, thereby improving the accuracy of the charge and discharge of each battery cluster in the energy storage system.

[0153] In some embodiments, the electrical parameter information of each battery cluster includes the state of charge, charging power limit, discharging power limit, correction state of the state of charge, charging cycle count, and discharging cycle count of the battery cluster.

[0154] For a certain battery cluster, the state of charge of the battery cluster here can be determined according to the SOC of each battery pack in the battery cluster. Specifically, it can be the maximum value of the SOCs of each battery pack in the battery cluster, or the minimum value of the SOCs of each battery pack in the battery cluster, or the average value of the SOCs of each battery pack in the battery cluster. The specific value of the SOC of the battery cluster can be selected by the user according to needs and is not limited herein.

[0155] For a certain battery cluster, the charging power limit of the battery cluster here can be the maximum charging power allowed for the battery cluster. The charging power limit of the battery cluster can be determined according to the charging power limits of each battery pack in the battery cluster. Specifically, it can be the maximum value of the charging power limits of each battery pack in the battery cluster, or the minimum value of the charging power limits of each battery pack in the battery cluster, or the average value of the charging power limits of each battery pack in the battery cluster. The specific value of the charging power limit of the battery cluster can be selected by the user according to needs and is not limited herein.

[0156] For a certain battery cluster, the discharging power limit of the battery cluster here can be the maximum discharging power allowed for the battery cluster. The discharging power limit of the battery cluster can be determined according to the discharging power limits of each battery pack in the battery cluster. Specifically, it can be the maximum value of the discharging power limits of each battery pack in the battery cluster, or the minimum value of the discharging power limits of each battery pack in the battery cluster, or the average value of the discharging power limits of each battery pack in the battery cluster. The specific value of the discharging power limit of the battery cluster can be selected by the user according to needs and is not limited herein.

[0157] For a certain battery cluster, the correction status of the state of charge of the battery cluster may include: full charge correction status, full discharge correction status, and uncorrected status, etc. Here, the full charge correction status means that the battery cluster needs to be corrected in the full charge state. The full discharge correction status means that the battery cluster needs to be corrected in the full discharge state. The uncorrected status means that the battery cluster needs to be corrected in other states of charge.

[0158] It should be noted that the correction status of the state of charge is obtained by integrating the current and voltage of the battery cluster. The determination of the specific correction status of the state of charge belongs to the prior art and will not be elaborated here.

[0159] For a certain battery cluster, the number of charge cycles of the battery cluster can be how many times the battery cluster can be charged in total configured by the system. The number of charge cycles of the battery cluster can be determined according to the number of charge cycles of each battery pack in the battery cluster. Specifically, it can be the maximum value of the number of charge cycles in each battery pack in the battery cluster, or the minimum value of the number of charge cycles in each battery pack in the battery cluster, or the average value of the number of charge cycles in each battery pack in the battery cluster. The specific value of the number of charge cycles of the battery cluster can be selected according to user needs and is not limited here.

[0160] For a certain battery cluster, the number of discharge cycles of the battery cluster can be how many times the battery cluster can be discharged in total configured by the system. The number of discharge cycles of the battery cluster can be determined according to the number of discharge cycles of each battery pack in the battery cluster. Specifically, it can be the maximum value of the number of discharge cycles in each battery pack in the battery cluster, or the minimum value of the number of discharge cycles in each battery pack in the battery cluster, or the average value of the number of discharge cycles in each battery pack in the battery cluster. The specific value of the number of discharge cycles of the battery cluster can be selected according to user needs and is not limited here.

[0161] Regarding S620, in order to accurately determine the charge and discharge priorities of each battery cluster in the energy storage system, S620 may specifically include:

[0162] Determine the charge priority of each battery cluster in the energy storage system according to the state of charge of the battery cluster, the charge power limit, the correction status of the state of charge, and the number of charge cycles;

[0163] Determine the discharge priority of each battery cluster in the energy storage system according to the state of charge of the battery cluster, the discharge power limit, the correction status of the state of charge, and the number of discharge cycles.

[0164] In some embodiments of the present application, the charging priorities of the battery clusters in the energy storage system can be determined according to the state of charge, charging power limit, corrected state of the state of charge, and number of charging cycles of the battery clusters, and the discharging priorities of the battery clusters in the energy storage system can be determined according to the state of charge, discharging power limit, corrected state of the state of charge, and number of discharging cycles of the battery clusters.

[0165] In this way, according to the electrical parameter information of each battery cluster, the charging priority and discharging priority of each battery cluster can be accurately determined, so as to charge and discharge each battery cluster based on the charging priority and discharging priority of each battery cluster, thereby improving the accuracy of charging and discharging the battery clusters in the energy storage system.

[0166] In some embodiments, in order to accurately determine the charging priority of each battery cluster, the step of determining the charging priority of each battery cluster in the energy storage system according to the state of charge, charging power limit, corrected state of the state of charge, and number of charging cycles of the battery cluster may specifically include:

[0167] When it is determined that the state of charge of the first battery cluster is less than the first threshold, determine that the charging priority of the first battery cluster is the first charging priority;

[0168] When it is determined that the state of charge of the first battery cluster is not less than the first threshold and the corrected state of the state of charge of the first battery cluster is the uncorrected state, determine that the charging priority of the first battery cluster is the second charging priority;

[0169] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, the corrected state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster meets the condition for charging, determine that the charging priority of the first battery cluster is the third charging priority;

[0170] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, the corrected state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, the state of charge of the first battery cluster does not meet the condition for charging, and the historical charging cycle number of the first battery cluster is less than the preset charging cycle number, determine that the charging priority of the first battery cluster is the fourth charging priority;

[0171] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, the corrected state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, the state of charge of the first battery cluster does not meet the condition for charging, the historical charging cycle number of the first battery cluster is not less than the preset charging cycle number, and the charging power limit of the first battery cluster is the preset charging power limit, determine that the charging priority of the first battery cluster is the fifth charging priority;

[0172] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, and the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the condition for charging, and the historical charge cycle count of the first battery cluster is not less than the preset charge cycle count, and the charge power limit of the first battery cluster is not the preset charge power limit, then determine that the charge priority of the first battery cluster is the sixth charge priority.

[0173] Wherein, the first battery cluster is any one of the battery clusters in the energy storage system.

[0174] The first threshold can be the threshold of the state of charge of the first battery cluster set in advance. For example, this threshold can be 5%.

[0175] The condition for charging can be the condition for charging the first battery cluster. For example, this condition for charging can be that the state of charge of the first battery cluster is less than 90%.

[0176] The historical charge cycle count can be the number of times the first battery cluster has been charged in a cycle before the current time.

[0177] The preset charge cycle count can be the threshold of the historical charge cycle count set in advance. Specifically, this preset charge cycle count can be the average value of the charge cycle counts of the battery clusters in the energy storage system.

[0178] The preset charge power limit can be the threshold of the charge power limit set in advance. Specifically, this preset charge power limit can be the maximum value of the charge power limits of the battery clusters in the energy storage system.

[0179] The priority levels of the first charge priority, the second charge priority, the third charge priority, the fourth charge priority, the fifth charge priority, and the sixth charge priority decrease in turn.

[0180] In some embodiments, by according to the state of charge of the battery cluster, the charge power limit, the correction state of the state of charge, and the charge cycle count, the charge priorities of the battery clusters in the energy storage system can be determined.

[0181] In this way, by according to the state of charge of the battery cluster, the charge power limit, the correction state of the state of charge, and the charge cycle count, the charge priorities of the battery clusters in the energy storage system can be accurately determined.

[0182] In some embodiments, in order to accurately determine the discharge priorities of the battery clusters, the method of determining the discharge priorities of the battery clusters in the energy storage system according to the state of charge of the battery cluster, the discharge power limit, the correction state of the state of charge, and the discharge cycle count specifically may include:

[0183] When it is determined that the correction status of the state of charge of the first battery cluster is the uncorrected status, determine that the discharge priority of the first battery cluster is the first discharge priority;

[0184] When it is determined that the correction status of the state of charge of the first battery cluster is the full charge correction status or the full discharge correction status, and the state of charge of the first battery cluster is in the condition that discharge is required, determine that the discharge priority of the first battery cluster is the second discharge priority;

[0185] When it is determined that the correction status of the state of charge of the first battery cluster is the full charge correction status or the full discharge correction status, and the state of charge of the first battery cluster is not in the condition that discharge is required, and the historical discharge cycle times of the first battery cluster are less than the preset discharge cycle times, determine that the discharge priority of the first battery cluster is the third discharge priority;

[0186] When it is determined that the correction status of the state of charge of the first battery cluster is the full charge correction status or the full discharge correction status, and the state of charge of the first battery cluster is not in the condition that discharge is required, and the historical discharge cycle times of the first battery cluster are not less than the preset discharge cycle times, and the discharge power limit value of the first battery cluster is the preset discharge power limit value, determine that the discharge priority of the first battery cluster is the fourth discharge priority;

[0187] When it is determined that the correction status of the state of charge of the first battery cluster is the full charge correction status or the full discharge correction status, and the state of charge of the first battery cluster is not in the condition that discharge is required, and the historical discharge cycle times of the first battery cluster are not less than the preset discharge cycle times, and the discharge power limit value of the first battery cluster is not the preset discharge power limit value, determine that the discharge priority of the first battery cluster is the fifth discharge priority.

[0188] Among them, the condition that discharge is required can be the condition that discharge is required for the first battery cluster. For example, the condition that discharge is required can be that the state of charge of the first battery cluster is greater than 20%.

[0189] The historical discharge cycle times can be the number of times the first battery cluster has cycled and discharged before the current time.

[0190] The preset discharge cycle times can be the threshold of the historical discharge cycle times set in advance. Specifically, the preset discharge cycle times can be the average value of the discharge cycle times of each battery cluster in the energy storage system.

[0191] The preset discharge power limit value can be the threshold of the discharge power limit value set in advance. Specifically, the preset discharge power limit value can be the maximum value of the discharge power limit values of each battery cluster in the energy storage system.

[0192] The priority levels of the first discharge priority, the second discharge priority, the third discharge priority, the fourth discharge priority, and the fifth discharge priority decrease in sequence.

[0193] In some embodiments, by according to the state of charge of the battery clusters, the discharge power limit, the corrected state of the state of charge, and the number of discharge cycles, the discharge priority of each battery cluster in the energy storage system can be determined.

[0194] In this way, by according to the state of charge of the battery clusters, the discharge power limit, the corrected state of the state of charge, and the number of discharge cycles, the discharge priority of each battery cluster in the energy storage system can be accurately determined.

[0195] Based on the same inventive concept, an embodiment of the present application further provides an energy management device for an energy storage system. The following will be combined with Figure 7 to describe in detail the energy management device for the energy storage system provided by the embodiment of the present application.

[0196] Figure 7 The structural schematic diagram of an energy management device for an energy storage system provided by an embodiment of the present application is shown.

[0197] As Figure 7 shown, the energy management device of this energy storage system is applied to Figure 2 the energy storage converter 220 in

[0198] The receiving module 710 is configured to receive the charge-discharge priorities of each of the battery clusters in the energy storage system sent by the receiving controller;

[0199] The charge-discharge module 720 is configured to perform charge and discharge on each of the battery clusters according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each of the battery clusters in the energy storage system.

[0200] Thus, by the energy storage converter receiving the charge-discharge priorities of each battery cluster in the energy storage system sent by the controller, and then performing charge and discharge on each battery cluster in the energy storage system according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system. In this way, the charge and discharge are not carried out with the energy storage system as a whole, but are based on each battery cluster in the energy storage system, which will not cause the problem that the energy in each battery cluster in the energy storage system is unbalanced, resulting in frequent replacement of the battery clusters and affecting the service life of the battery clusters. The solution of the embodiment of the present application realizes the charge and discharge of each battery cluster in a single distributed energy storage system, and reduces the maintenance and repair costs of the energy storage system.

[0201] In some embodiments, the charge-discharge module 720 may specifically include:

[0202] A charging unit, configured to charge each battery cluster according to the charging priority of each battery cluster in the energy storage system when it is determined that the energy storage system is in a charging state;

[0203] A discharging unit, configured to discharge each battery cluster according to the discharging priority of each battery cluster in the energy storage system when it is determined that the energy storage system is in a discharging state.

[0204] In some embodiments, the charging unit specifically includes:

[0205] A first acquisition subunit, configured to acquire the unallocated charging power of the energy management system of the energy storage system;

[0206] A first charging subunit, configured to fully charge each single cell in the battery cluster with the first charging priority by using the unallocated charging power when it is determined that the unallocated charging power is greater than or equal to the charging power limit of the battery cluster with the first charging priority, wherein the charging power limit of each battery cluster is determined based on the charging power limits of the single cells in the battery cluster;

[0207] A second charging subunit, configured to evenly charge each single cell in the battery cluster with the first charging priority by using the unallocated charging power when it is determined that the unallocated charging power is less than the charging power limit of the battery cluster with the first charging priority.

[0208] In some embodiments, the second charging subunit may specifically be configured to:

[0209] Acquire the first quantity of each single cell in the battery cluster with the first charging priority;

[0210] Based on the first quantity, divide the unallocated charging power into M equal parts to obtain the divided unallocated charging power, where M is equal to the first quantity;

[0211] Evenly charge each single cell in the battery cluster with the first charging priority by using the divided unallocated charging power.

[0212] In some embodiments, the discharging unit may specifically include:

[0213] A second acquisition subunit, configured to acquire the unallocated discharging power of the energy management system of the energy storage system;

[0214] A first discharging subunit, configured to, when it is determined that the unallocated discharging power is greater than or equal to the discharging power limit of the battery clusters with the first discharging priority, use the unallocated discharging power to fully discharge each single battery cell in the battery clusters with the first discharging priority, where the discharging power limit of each battery cluster is determined based on the discharging power limits of the single battery cells in the battery cluster;

[0215] A second discharging subunit, configured to, when it is determined that the unallocated discharging power is less than the discharging power limit of the battery clusters with the first discharging priority, use the unallocated discharging power to uniformly discharge each single battery cell in the battery clusters with the first discharging priority.

[0216] In some embodiments, the second discharging subunit may specifically be configured to:

[0217] Obtain a second quantity of each single battery cell in the battery clusters with the first discharging priority;

[0218] Based on the second quantity, equally divide the unallocated discharging power into N equal parts to obtain the equally divided unallocated discharging power, where N is equal to the second quantity;

[0219] Use the equally divided unallocated discharging power to uniformly discharge each single battery cell in the battery clusters with the first discharging priority.

[0220] Figure 8 FIG. shows a schematic structural diagram of an energy management device of an energy storage system provided in an embodiment of the present application.

[0221] As Figure 8 shown, the energy management device of the energy storage system is applied to Figure 2 the master controller 210 therein. The device includes:

[0222] An acquisition module 810, configured to acquire the electrical parameter information of each battery cluster in the energy storage system;

[0223] A determination module 820, configured to determine the charge and discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information;

[0224] A sending module 830, configured to send the charge and discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter charges and discharges each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system.

[0225] Thus, the controller obtains the electrical parameter information of each battery cluster in the energy storage system, and then determines the charge-discharge priorities of the battery clusters in the energy storage system according to the electrical parameter information, and sends the charge-discharge priorities of the battery clusters in the energy storage system to the energy storage converter, so that the energy storage converter can obtain the accurate charge-discharge priorities of the battery clusters in the energy storage system, and then can charge and discharge each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of the battery clusters in the energy storage system, thus improving the accuracy of charging and discharging of the battery clusters in the energy storage system.

[0226] In some embodiments, the electrical parameter information of each battery cluster includes the state of charge, the charging power limit, the discharging power limit, the correction state of the state of charge, the number of charging cycles, and the number of discharging cycles of the battery cluster;

[0227] The determining module 820 may specifically include:

[0228] The first determining unit is configured to determine the charging priority of each battery cluster in the energy storage system according to the state of charge, the charging power limit, the correction state of the state of charge, and the number of charging cycles of the battery cluster;

[0229] The second determining unit is configured to determine the discharging priority of each battery cluster in the energy storage system according to the state of charge, the discharging power limit, the correction state of the state of charge, and the number of discharging cycles of the battery cluster.

[0230] In some embodiments, the first determining unit may specifically be configured to:

[0231] When it is determined that the state of charge of the first battery cluster is less than the first threshold, determine that the charging priority of the first battery cluster is the first charging priority, where the first battery cluster is any one of the battery clusters in the energy storage system;

[0232] When it is determined that the state of charge of the first battery cluster is not less than the first threshold and the correction state of the state of charge of the first battery cluster is the uncorrected state, determine that the charging priority of the first battery cluster is the second charging priority;

[0233] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster is in the condition of needing to be charged, determine that the charging priority of the first battery cluster is the third charging priority;

[0234] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, and the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for charging, and the historical charge cycle count of the first battery cluster is less than the preset charge cycle count, determine that the charging priority of the first battery cluster is the fourth charging priority, where the preset charge cycle count is the average of the charge cycle counts of each battery cluster in the energy storage system;

[0235] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, and the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for charging, and the historical charge cycle count of the first battery cluster is not less than the preset charge cycle count, and the charging power limit of the first battery cluster is the preset charging power limit, determine that the charging priority of the first battery cluster is the fifth charging priority, where the preset charging power limit is the maximum value of the charging power limits of each battery cluster in the energy storage system;

[0236] When it is determined that the state of charge of the first battery cluster is not less than the first threshold, and the correction state of the state of charge of the first battery cluster is not the uncorrected state, and the state of charge of the first battery cluster does not meet the conditions for charging, and the historical charge cycle count of the first battery cluster is not less than the preset charge cycle count, and the charging power limit of the first battery cluster is not the preset charging power limit, determine that the charging priority of the first battery cluster is the sixth charging priority;

[0237] Among them, the first charging priority, the second charging priority, the third charging priority, the fourth charging priority, the fifth charging priority, and the sixth charging priority decrease in priority level in turn.

[0238] In some embodiments, the second determination unit may specifically be used for:

[0239] When it is determined that the correction state of the state of charge of the first battery cluster is the uncorrected state, determine that the discharge priority of the first battery cluster is the first discharge priority, where the first battery cluster is any one of the battery clusters in the energy storage system;

[0240] When it is determined that the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster meets the conditions for discharging, determine that the discharge priority of the first battery cluster is the second discharge priority;

[0241] When it is determined that the correction status of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for discharging, and the historical discharge cycle count of the first battery cluster is less than the preset discharge cycle count, determine that the discharge priority of the first battery cluster is the third discharge priority, where the preset discharge cycle count is the average value of the discharge cycle counts of each battery cluster in the first distributed energy storage system;

[0242] When it is determined that the correction status of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for discharging, and the historical discharge cycle count of the first battery cluster is not less than the preset discharge cycle count, and the discharge power limit of the first battery cluster is the preset discharge power limit, determine that the discharge priority of the first battery cluster is the fourth discharge priority, where the preset discharge power limit is the maximum value of the discharge power limits of each battery cluster in the energy storage system;

[0243] When it is determined that the correction status of the state of charge of the first battery cluster is not the uncorrected state, and the state of charge of the first battery cluster does not meet the conditions for discharging, and the historical discharge cycle count of the first battery cluster is not less than the preset discharge cycle count, and the discharge power limit of the first battery cluster is not the preset discharge power limit, determine that the discharge priority of the first battery cluster is the fifth discharge priority;

[0244] Among them, the priority levels of the first discharge priority, the second discharge priority, the third discharge priority, the fourth discharge priority, and the fifth discharge priority decrease in sequence.

[0245] Figure 9 FIG. shows a schematic structural diagram of an electronic device provided by an embodiment of the present application.

[0246] As Figure 9 shown, the electronic device 9 can implement a structural diagram of an exemplary hardware architecture of an electronic device capable of implementing the energy management method of the energy storage system and the energy management device of the energy storage system in the embodiments of the present application. The electronic device may refer to the electronic device in the embodiments of the present application.

[0247] The electronic device 9 may include a processor 901 and a memory 902 storing computer program instructions.

[0248] Specifically, the above-mentioned processor 901 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured as one or more integrated circuits for implementing the embodiments of the present application.

[0249] The memory 902 may include a mass storage for data or instructions. By way of example and not limitation, the memory 902 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disc, a magneto-optical disc, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In a suitable case, the memory 902 may include a removable or non-removable (or fixed) medium. In a suitable case, the memory 902 may be internal or external to the integrated gateway disaster recovery device. In a specific embodiment, the memory 902 is a non-volatile solid state memory. In a specific embodiment, the memory 902 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, generally, the memory 902 includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described in reference to the method according to an aspect of the present application.

[0250] The processor 901 reads and executes the computer program instructions stored in the memory 902 to implement the energy management method of any one of the energy storage systems in the above embodiments.

[0251] In one example, the electronic device may further include a communication interface 903 and a bus 904. Among them, as Figure 9 shown, the processor 901, the memory 902, and the communication interface 903 are connected through the bus 904 and complete communication with each other.

[0252] The communication interface 903 is mainly used to implement communication between each module, device, unit, and / or device in the embodiments of the present application.

[0253] Bus 904 includes hardware, software, or both, and couples components of the electronic device to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable bus or a combination of two or more of these. Where appropriate, bus 904 may include one or more buses. Although embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0254] The electronic device can execute the energy management method of the energy storage system in the embodiments of the present application, so as to implement the combination Figure 3 , Figure 6 , Figure 7 and Figure 8 the energy management method and device of the energy storage system described.

[0255] In addition, in combination with the energy management method of the energy storage system in the above embodiments, embodiments of the present application can provide a computer storage medium to implement. Computer program instructions are stored on the computer storage medium; when the computer program instructions are executed by a processor, any one of the energy management methods of the energy storage system in the above embodiments is implemented.

[0256] In addition, in combination with the energy management method of the energy storage system in the above embodiments, embodiments of the present application can provide a computer program product. When the instructions in the computer program product are executed by the processor of the electronic device, the electronic device executes any one of the energy management methods of the energy storage system in the above embodiments.

[0257] It should be clear that the present application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present application.

[0258] The functional blocks shown in the above-described structural block diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, and so on. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted via a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical discs, hard disks, fiber optic media, radio frequency (RF) links, and so on. The code segment can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0259] It should also be noted that in the exemplary embodiments mentioned in the present application, some methods or systems are described based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be executed in the order mentioned in the embodiments, can be different from the order in the embodiments, or several steps can be executed simultaneously.

[0260] Aspects of the present application have been described above with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present application. It should be understood that each block in the flowcharts and / or block diagrams, and the combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more blocks of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each block in the block diagram and / or flowchart, and the combinations of blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0261] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy management method for an energy storage system, the energy storage system comprising a plurality of battery clusters, characterized in that, The method is applied to an energy storage converter, and the energy storage converter corresponds to each battery cluster one by one. The method includes: Receiving the charge and discharge priorities of each battery cluster in the energy storage system sent by a controller; Performing charge and discharge on each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system.

2. The method according to claim 1, wherein The performing charge and discharge on each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system includes: When it is determined that the energy storage system is in a charging state, charging each battery cluster according to the charging priorities of each battery cluster in the energy storage system; When it is determined that the energy storage system is in a discharging state, discharging each battery cluster according to the discharging priorities of each battery cluster in the energy storage system.

3. The method according to claim 2, wherein The charging each battery cluster according to the charging priorities of each battery cluster in the energy storage system includes: Obtaining the unallocated charging power of the energy management system of the energy storage system; When it is determined that the unallocated charging power is greater than or equal to the charging power limit of the battery cluster with the first charging priority, using the unallocated charging power to fully charge each single cell in the battery cluster with the first charging priority, where the charging power limit of each battery cluster is determined based on the charging power limits of each single cell in the battery cluster; When it is determined that the unallocated charging power is less than the charging power limit of the battery cluster with the first charging priority, using the unallocated charging power to evenly charge each single cell in the battery cluster with the first charging priority.

4. The method according to claim 3, wherein The using the unallocated charging power to evenly charge each single cell in the battery cluster with the first charging priority includes: Obtaining the first quantity of each single cell in the battery cluster with the first charging priority; Based on the first quantity, equally dividing the unallocated charging power into M parts to obtain the equally divided unallocated charging power, where M is equal to the first quantity; Using the equally divided unallocated charging power to evenly charge each single cell in the battery cluster with the first charging priority.

5. The method according to claim 2, wherein The discharging each battery cluster according to the discharging priorities of each battery cluster in the energy storage system includes: Obtaining the unallocated discharging power of the energy management system of the energy storage system; When it is determined that the unallocated discharging power is greater than or equal to the discharging power limit of the battery cluster with the first discharging priority, using the unallocated discharging power to fully discharge each single cell in the battery cluster with the first discharging priority, where the discharging power limit of each battery cluster is determined based on the discharging power limits of each single cell in the battery cluster; When it is determined that the unallocated discharging power is less than the discharging power limit of the battery cluster with the first discharging priority, using the unallocated discharging power to evenly discharge each single cell in the battery cluster with the first discharging priority.

6. The method according to claim 5, characterized in that, Utilizing the unallocated discharge power to uniformly discharge each single battery cell in the battery cluster with the first discharge priority includes: Obtaining the second quantity of each single battery cell in the battery cluster with the first discharge priority; Based on the second quantity, equally dividing the unallocated discharge power into N parts to obtain the equally divided unallocated discharge power, where N is equal to the second quantity; Utilizing the equally divided unallocated discharge power to uniformly discharge each single battery cell in the battery cluster with the first discharge priority.

7. An energy management method for an energy storage system, characterized in that, The method is applied to a controller, and the method includes: Obtaining the electrical parameter information of each battery cluster in the energy storage system; Determining the charge and discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information; Sending the charge and discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter charges and discharges each battery cluster according to the charge and discharge state of the energy storage system and the charge and discharge priorities of each battery cluster in the energy storage system.

8. The method according to claim 7, wherein The electrical parameter information of each battery cluster includes the state of charge, charging power limit, discharging power limit, correction state of the state of charge, number of charge cycles, and number of discharge cycles of the battery cluster; The determining the charge and discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information includes: Determining the charge priorities of each battery cluster in the energy storage system according to the state of charge, charging power limit, correction state of the state of charge, and number of charge cycles of the battery cluster; Determining the discharge priorities of each battery cluster in the energy storage system according to the state of charge, discharging power limit, correction state of the state of charge, and number of discharge cycles of the battery cluster.

9. The method according to claim 7, wherein The determining the charge priorities of each battery cluster in the energy storage system according to the state of charge, charging power limit, correction state of the state of charge, and number of charge cycles of the battery cluster includes: When it is determined that the state of charge of the first battery cluster is less than the first threshold, determining the charge priority of the first battery cluster as the first charge priority, where the first battery cluster is any one of the battery clusters in the energy storage system; When it is determined that the state of charge of the first battery cluster is not less than the first threshold and the correction state of the state of charge of the first battery cluster is the uncorrected state, determining the charge priority of the first battery cluster as the second charge priority; When it is determined that the state of charge of the first battery cluster is not less than the first threshold, the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster is in the condition that charging is required, determining the charge priority of the first battery cluster as the third charge priority; When it is determined that the state of charge of the first battery cluster is not less than the first threshold, and the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for charging, and the historical charge cycle number of the first battery cluster is less than the preset charge cycle number, determine that the charge priority of the first battery cluster is the fourth charge priority, where the preset charge cycle number is the average value of the charge cycle numbers of each battery cluster in the energy storage system; When it is determined that the state of charge of the first battery cluster is not less than the first threshold, and the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for charging, and the historical charge cycle number of the first battery cluster is not less than the preset charge cycle number, and the charge power limit of the first battery cluster is the preset charge power limit, determine that the charge priority of the first battery cluster is the fifth charge priority, where the preset charge power limit is the maximum value of the charge power limits of each battery cluster in the energy storage system; When it is determined that the state of charge of the first battery cluster is not less than the first threshold, and the correction state of the state of charge of the first battery cluster is not the uncorrected state, and the state of charge of the first battery cluster does not meet the conditions for charging, and the historical charge cycle number of the first battery cluster is not less than the preset charge cycle number, and the charge power limit of the first battery cluster is not the preset charge power limit, determine that the charge priority of the first battery cluster is the sixth charge priority; Among them, the priority levels of the first charge priority, the second charge priority, the third charge priority, the fourth charge priority, the fifth charge priority, and the sixth charge priority decrease in turn.

10. The method according to claim 7, characterized in that Determining the discharge priorities of the battery clusters in the energy storage system according to the state of charge, discharge power limit, correction state of the state of charge, and discharge cycle number of the battery clusters includes: When it is determined that the correction state of the state of charge of the first battery cluster is the uncorrected state, determine that the discharge priority of the first battery cluster is the first discharge priority, where the first battery cluster is any one of the battery clusters in the energy storage system; When it is determined that the correction state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster meets the conditions for discharging, determine that the discharge priority of the first battery cluster is the second discharge priority; When it is determined that the corrected state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for discharging, and the historical discharge cycle count of the first battery cluster is less than the preset discharge cycle count, the discharge priority of the first battery cluster is determined to be the third discharge priority, where the preset discharge cycle count is the average value of the discharge cycle counts of each battery cluster in the first distributed energy storage system; When it is determined that the corrected state of the state of charge of the first battery cluster is the full charge correction state or the full discharge correction state, and the state of charge of the first battery cluster does not meet the conditions for discharging, and the historical discharge cycle count of the first battery cluster is not less than the preset discharge cycle count, and the discharge power limit of the first battery cluster is the preset discharge power limit, the discharge priority of the first battery cluster is determined to be the fourth discharge priority, where the preset discharge power limit is the maximum value of the discharge power limits of each battery cluster in the energy storage system; When it is determined that the corrected state of the state of charge of the first battery cluster is not the uncorrected state, and the state of charge of the first battery cluster does not meet the conditions for discharging, and the historical discharge cycle count of the first battery cluster is not less than the preset discharge cycle count, and the discharge power limit of the first battery cluster is not the preset discharge power limit, the discharge priority of the first battery cluster is determined to be the fifth discharge priority; Among them, the priority levels of the first discharge priority, the second discharge priority, the third discharge priority, the fourth discharge priority, and the fifth discharge priority decrease in sequence.

11. An energy management device for an energy storage system, characterized in that, The energy storage system includes multiple battery clusters, and the device is applied to an energy storage converter, and the energy storage converter corresponds to the battery clusters one by one. The device includes: A receiving module, configured to receive the charge-discharge priorities of each battery cluster in the energy storage system sent by the controller; A charge-discharge module, configured to perform charge and discharge on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

12. An energy management device for an energy storage system, characterized in that, The device is applied to a controller, and the device includes: An acquisition module, configured to acquire the electrical parameter information of each battery cluster in the energy storage system; A determination module, configured to determine the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information; A sending module, configured to send the charge-discharge priorities of each battery cluster in the energy storage system to the energy storage converter, so that the energy storage converter performs charge and discharge on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

13. An energy management system for an energy storage system, characterized in that, The system includes: A controller, configured to acquire the electrical parameter information of each battery cluster in the energy storage system; determine the charge-discharge priorities of each battery cluster in the energy storage system according to the electrical parameter information; and send the charge-discharge priorities of each battery cluster in the energy storage system to the energy storage converter; The energy storage converter is configured to receive the charge-discharge priorities of each battery cluster in the energy storage system sent by the controller, and perform charge and discharge operations on each battery cluster according to the charge-discharge state of the energy storage system and the charge-discharge priorities of each battery cluster in the energy storage system.

14. An electronic device, characterized in that, It includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, it implements the steps of the energy management method of the energy storage system according to any one of claims 1-10.

15. A readable storage medium, characterized in that, The program or instruction is stored on the readable storage medium. When the program or instruction is executed by the processor, it implements the steps of the energy management method of the energy storage system according to any one of claims 1-10.

16. A computer program product, characterized in that, When the instructions in the computer program product are executed by the processor of the electronic device, the electronic device is caused to execute the steps of the energy management method of the energy storage system according to any one of claims 1-10.

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