Calibration method and device of energy storage system, energy storage system, chip and program product

Abstract

The invention provides a calibration method and device of an energy storage system, the energy storage system, a chip and a program product. The energy storage system comprises a plurality of battery clusters. Acquiring required power and a first priority sequence of the plurality of battery clusters; according to the demand power and the first priority sequence, the charging and discharging power of a plurality of battery clusters is determined, and when the charging and discharging power of a first battery cluster in the plurality of battery clusters is lower than a power threshold value, the first battery cluster is controlled to carry out SOC calibration, and the method comprises the following steps: obtaining SOC difference values among a plurality of battery monomers of the first battery cluster; when the first SOC value is greater than a first threshold value and the SOC difference value is greater than a second threshold value, controlling the first battery cluster to perform SOC low-end standing calibration; and if the first SOC value is greater than the first threshold value and the SOC difference value is less than or equal to the second threshold value, controlling the first battery cluster to perform SOC low-end standing calibration or SOC full-charge calibration so as to improve the safety and reliability of the energy storage system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage, and more particularly, to a calibration method and device of an energy storage system, the energy storage system, a chip and a program product. BACKGROUND

[0002] Under the background of increasing support for the development of new energy technologies worldwide, various energy storage-related technologies have been widely applied. The energy storage system needs to be calibrated during the charging and discharging process to improve the safety and reliability of the energy storage system. Therefore, how to effectively manage the calibration of the energy storage system is a problem to be solved. SUMMARY

[0003] The embodiments of the present application provide a calibration method and device of an energy storage system, the energy storage system, a chip and a program product to improve the safety and reliability of the energy storage system.

[0004] In a first aspect, a calibration method of an energy storage system is provided, the energy storage system including a plurality of battery clusters, the plurality of battery clusters including a first battery cluster; the calibration method includes: obtaining a required power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each first SOC value in the plurality of first SOC values corresponding to one battery cluster in the plurality of battery clusters; determining charging and discharging power of the plurality of battery clusters according to the required power and the first priority sequence; controlling the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging power, the SOC calibration including SOC low-end static calibration and SOC full-charge calibration; in the case that the charging and discharging power of the first battery cluster is lower than a power threshold, controlling the first battery cluster to perform SOC calibration, including: obtaining an SOC difference value between a plurality of battery monomers of the first battery cluster; in the case that the first SOC value is greater than a first threshold and the SOC difference value is greater than a second threshold, controlling the first battery cluster to perform SOC low-end static calibration; in the case that the first SOC value is greater than the first threshold and the SOC difference value is less than or equal to the second threshold, controlling the first battery cluster to perform SOC low-end static calibration or SOC full-charge calibration.

[0005] Compared with the calibration method by ampere-hour integration, the application can determine the charging and discharging power of the plurality of battery clusters according to the demand power, control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging power, that is, the plurality of battery clusters in the energy storage system can be calibrated at the end of charging and discharging, and the starting point of ampere-hour integration is reset to reduce the cumulative error of the plurality of battery clusters and improve the accuracy of calibration. Secondly, according to the demand power and the first priority sequence, the charging and discharging power of the plurality of battery clusters is determined, and the plurality of battery clusters is controlled to perform SOC and / or SOH calibration according to the charging and discharging power. This process can level the SOC difference between different battery clusters. At this time, the energy storage system is not idle to calibrate, but completes the calibration while charging and discharging, improves the operation and maintenance efficiency, and ensures the reliability of the energy storage system. In addition, the charging and discharging power of the plurality of battery clusters is determined according to the demand power and the first priority sequence, which can allocate the battery cluster to the appropriate charging and discharging power to improve the calibration performance of the energy storage system, thereby improving the overall efficiency of the energy storage system while improving the reliability of the energy storage system. In the case where the first SOC value is greater than the first threshold value and the SOC difference is greater than the second threshold value, the first battery cluster is controlled to perform SOC low-end static calibration. In the case where the SOC imbalance between the battery cells of the first battery cluster is large, the SOC low-end static calibration can realize the SOC balance between the battery cells of the first battery cluster while reducing the risk of overcharging of the first battery cluster. In the case where the first SOC value is greater than the first threshold value and the SOC difference is less than or equal to the second threshold value, the first battery cluster is controlled to perform SOC low-end static calibration or SOC full charging calibration. The SOC low-end static calibration or the SOC full charging calibration can realize the SOC balance of the battery cells in the first battery cluster to improve the overall calibration performance of the energy storage system.

[0006] In some embodiments, determining the charging and discharging power of the plurality of battery clusters according to the demand power and the first priority sequence comprises: determining the charging and discharging power of the plurality of battery clusters according to the demand power, the first priority sequence, and a plurality of weight proportion values; wherein each weight proportion value in the plurality of weight proportion values corresponds to one of the plurality of first SOC values.

[0007] In the scheme of the embodiments of the application, the charging and discharging power of the plurality of battery clusters is determined according to the demand power, the first priority sequence, and a plurality of weight proportion values. Each battery cluster in the plurality of battery clusters can be further allocated to the appropriate charging and discharging power. Calibration according to the charging and discharging power can reduce the SOC difference between the battery clusters in the energy storage system, improve the SOC consistency of the energy storage system, and improve the accuracy of the proportion of the remaining available energy of the energy storage system and the SOC availability of the energy storage system. In addition, the calibration performance of the energy storage system can be improved, thereby improving the overall efficiency of the energy storage system while improving the reliability of the energy storage system.

[0008] In some embodiments, the charging and discharging power of the plurality of battery clusters is determined according to the demand power, the first priority sequence, and the plurality of weight ratio values, including: distributing the demand power according to the first priority sequence and the plurality of weight ratio values to determine the charging and discharging power of the plurality of battery clusters respectively.

[0009] In the scheme of the embodiments of the present application, the demand power is distributed according to the first priority sequence and the plurality of weight ratio values to determine the charging and discharging power of the plurality of battery clusters respectively, which can further allocate a more suitable charging and discharging power to each battery cluster in the plurality of battery clusters, and calibration according to the charging and discharging power can reduce the SOC difference between the battery clusters in the energy storage system, improve the SOC consistency of the energy storage system, improve the accuracy of the proportion of the remaining available energy of the energy storage system, and improve the SOC availability of the energy storage system. In addition, the calibration performance of the energy storage system can also be improved, thereby improving the overall efficiency of the energy storage system while improving the reliability of the energy storage system.

[0010] In some embodiments, the plurality of battery clusters includes a second battery cluster, and before the plurality of battery clusters are controlled to perform SOC and / or SOH calibration according to the charging and discharging power, the method includes: obtaining calibration state information and a second priority sequence of the second battery cluster, the second priority sequence being determined according to a calibration mode; determining a corresponding calibration mode in the second priority sequence according to the calibration state information; and performing calibration of the corresponding calibration mode in the second priority sequence on the second battery cluster according to the calibration mode; wherein the calibration mode includes SOC full charging calibration, SOC low-end static calibration state, SOH full charging state, SOH low-end static calibration state, SOC equalization state, and normal state, and the calibration state information includes SOC calibration, SOH calibration, and SOC equalization.

[0011] In the scheme of the embodiments of the present application, the calibration mode corresponding to the second priority sequence is determined according to the calibration state information of the second battery cluster, and then calibration is performed, which can more accurately calibrate the second battery cluster and improve the calibration efficiency, thereby improving the calibration performance of the energy storage system.

[0012] In some embodiments, the second priority sequence is determined according to the calibration accuracy and / or calibration period of the plurality of battery clusters.

[0013] In the scheme of the embodiments of the present application, the second priority sequence is determined according to the calibration accuracy and / or calibration period of the plurality of battery clusters, which can improve the calibration efficiency and reduce the calibration cost through the second priority sequence, continuously maintain the energy storage system in the best performance state, thereby maximizing the full life cycle of the energy storage system, and ensuring the safe and reliable operation of the energy storage system.

[0014] In some embodiments, after the SOC and / or SOH calibration of the plurality of battery clusters is controlled according to the charging and discharging power, the method further includes: obtaining second SOC values of the plurality of battery clusters; and controlling the plurality of battery clusters to perform SOC inter-cluster balancing according to the second SOC values.

[0015] In the scheme of the embodiments of the present application, the SOC inter-cluster balancing of the plurality of battery clusters is controlled according to the second SOC values, which can make the SOC of the plurality of battery clusters of the energy storage system consistent, thereby improving the SOC calibration performance of the entire energy storage system.

[0016] In a second aspect, a calibration method of an energy storage system is provided. The energy storage system includes a plurality of battery clusters. The calibration method includes: sending a demand power; receiving charging and discharging powers of the plurality of battery clusters, the charging and discharging powers being determined according to the demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; and sending a power distribution instruction according to the charging and discharging powers.

[0017] In a third aspect, an energy storage system is provided. The energy storage system includes: a plurality of battery clusters, the plurality of battery clusters including a first battery cluster; and a first controller configured to: obtain a demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; determine charging and discharging powers of the plurality of battery clusters according to the demand power and the first priority sequence; control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging powers, the SOC calibration including SOC low-end static calibration and SOC full-charge calibration; and in a case where the charging and discharging power of the first battery cluster is lower than a power threshold, control the first battery cluster to perform the SOC calibration, including: obtain SOC difference values between a plurality of battery cells of the first battery cluster; in a case where the first SOC value is greater than a first threshold and the SOC difference values are greater than a second threshold, control the first battery cluster to perform the SOC low-end static calibration; and in a case where the first SOC value is greater than the first threshold and the SOC difference values are less than or equal to the second threshold, control the first battery cluster to perform the SOC low-end static calibration or the SOC full-charge calibration.

[0018] In a fourth aspect, a power storage system is provided, including: a plurality of battery clusters; a second controller configured to send a demand power; the second controller is further configured to receive charging and discharging powers of the plurality of battery clusters, the charging and discharging powers being determined according to the demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; and the second controller is further configured to send power distribution instructions according to the charging and discharging powers.

[0019] In a fifth aspect, a calibration device for a power storage system is provided, the power storage system including a plurality of battery clusters, the plurality of battery clusters including a first battery cluster; the calibration device including an obtaining unit and a determining unit, the obtaining unit is configured to obtain a demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; the determining unit is configured to determine charging and discharging powers of the plurality of battery clusters according to the demand power and the first priority sequence; the determining unit is further configured to control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging powers, the SOC calibration including SOC low-end static calibration and SOC full-charge calibration; and the determining unit is further configured to control the first battery cluster to perform SOC calibration in a case that the charging and discharging power of the first battery cluster is lower than a power threshold, including: the determining unit is further configured to obtain an SOC difference between a plurality of battery cells of the first battery cluster; the determining unit is further configured to control the first battery cluster to perform the SOC low-end static calibration in a case that the first SOC value is greater than a first threshold and the SOC difference is greater than a second threshold; and the determining unit is further configured to control the first battery cluster to perform the SOC low-end static calibration or the SOC full-charge calibration in a case that the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold.

[0020] In a sixth aspect, a chip is provided, including: a processor configured to invoke and run a computer program from a memory, so that a device installed with the chip performs the calibration method according to the first aspect or any one of the embodiments of the first aspect.

[0021] In a seventh aspect, a computer program product is provided, including: computer program instructions, when executed by a computer, causing the computer to implement the calibration method according to the first aspect or any one of the embodiments of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A schematic diagram of a power storage system according to an embodiment of the present application is shown.

[0023] Figure 2 A flowchart of a calibration method of a power storage system according to an embodiment of the present application is shown.

[0024] Figure 3 A flowchart of a calibration method two of the energy storage system according to an embodiment of the present application is shown.

[0025] Figure 4 A flowchart of a calibration method three of the energy storage system according to an embodiment of the present application is shown.

[0026] Figure 5 A flowchart of a calibration method four of the energy storage system according to an embodiment of the present application is shown.

[0027] Figure 6 A flowchart of a calibration method five of the energy storage system according to an embodiment of the present application is shown.

[0028] Figure 7 A flowchart of a calibration method six of the energy storage system according to an embodiment of the present application is shown.

[0029] Figure 8 A flowchart of a calibration method seven of the energy storage system according to an embodiment of the present application is shown.

[0030] Figure 9 A flowchart of a calibration method eight of the energy storage system according to an embodiment of the present application is shown.

[0031] Figure 10 A schematic block diagram of a calibration device of the energy storage system according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0033] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms used in the description of the

[0035] Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common set of embodiments.

[0036] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0037] The term "and / or" in the application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0038] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0039] "Multiple" appearing in the application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0040] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0041] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0042] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0043] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0044] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0045] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0046] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0047] As an example, the box can include a first box and a second box. The first box and the second box are coupled so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, the enclosed refers to covering or closing, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0048] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0049] The embodiments of the present application provide a storage device including one or more battery clusters to improve the voltage and capacity of the storage device. The battery cluster can include a plurality of battery apparatuses connected in series through a busbar component to improve the voltage of the storage device. When the storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the storage device.

[0050] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electrical energy as needed and output the electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during a low electricity consumption period and provide electrical energy for relevant users or electrical equipment during a high electricity consumption period. The energy storage system provided by the embodiments of the present application can be any power system that needs to use an energy storage device.

[0051] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0052] In some embodiments, the energy storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0053] In some embodiments, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module, and a fire-fighting module, etc.

[0054] As an example, the thermal management module can include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery monomer to each battery device through a pipeline.

[0055] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0056] As an example, the general control module can serve as a battery management unit of the energy storage device for monitoring and managing the energy storage device. The general control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current and voltage of the energy storage device can be controlled. As an example, the general control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) and fiber conversion module, and other modules.

[0057] As an example, the fire-fighting system includes a control panel, a detector, an alarm device, etc., for detecting, alarming, or extinguishing the energy storage system.

[0058] As an example, the power distribution device can be used to distribute power to the power consumption module of the energy storage device.

[0059] In some embodiments, the energy storage system can include one or more energy storage devices and a power converter system (PCS) connected between the power generation device and the energy storage devices. The power generation device is configured to generate electric power, and the electric power generated by the power generation device can be stored in the energy storage devices through the power converter system. As an example, the power generation device can be a solar panel, a hydroelectric power generation device, a fire power generation device, a wind power generation device, etc. The specific type of the power generation device is not limited in the present application.

[0060] In the charging and discharging process of the energy storage system, the internal state of the battery cluster in the energy storage system, such as the state of charge (SOC) and the state of health (SOH), cannot be directly measured, but can only be estimated by external parameters such as voltage, current, temperature, etc. The estimation model will deviate over time, temperature and use, and needs to be corrected by calibration. Inaccurate calibration may lead to the risk of overcharging and overdischarging, causing safety hazards. In addition, in the process of participating in grid dispatching, assuming that the grid requires discharging 100 kWh, but the energy storage system only discharges 90 kWh due to inaccurate SOC, and then stops unexpectedly due to low voltage, which reduces the reliability of the energy storage system.

[0061] Based on the above considerations, in order to improve the safety and reliability of the energy storage system, the application provides a calibration method for an energy storage system, the energy storage system comprising a plurality of battery clusters, the plurality of battery clusters comprising a first battery cluster; the calibration method comprising: obtaining a required power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each first SOC value in the plurality of first SOC values corresponding to one battery cluster in the plurality of battery clusters; determining the charging and discharging power of the plurality of battery clusters according to the required power and the first priority sequence; controlling the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging power, the SOC calibration comprising SOC low-end static calibration and SOC full-charge calibration; in the case that the charging and discharging power of the first battery cluster is lower than a power threshold, controlling the first battery cluster to perform SOC calibration, comprising: obtaining the SOC difference between a plurality of battery monomers of the first battery cluster; in the case that the first SOC value is greater than a first threshold and the SOC difference is greater than a second threshold, controlling the first battery cluster to perform SOC low-end static calibration; in the case that the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold, controlling the first battery cluster to perform SOC low-end static calibration or SOC full-charge calibration. In the scheme of the embodiment of the application, compared with the calibration method by ampere-hour integration method, the application can determine the charging and discharging power of the plurality of battery clusters according to the required power, and control the plurality of battery clusters to perform calibration according to the charging and discharging power, that is, the plurality of battery clusters in the energy storage system can perform calibration at the end of charging and discharging, reset the starting point of ampere-hour integration, reduce the cumulative error of the plurality of battery clusters, and improve the accuracy of calibration. Secondly, the charging and discharging power of the plurality of battery clusters is determined according to the required power and the first priority sequence, and the plurality of battery clusters is controlled to perform calibration according to the charging and discharging power, which can level the SOC difference between different battery clusters. At this time, the energy storage system is not calibrated only when it is idle, but completes calibration while charging and discharging, improves the operation and maintenance efficiency, and ensures the reliability of the energy storage system. In addition, the charging and discharging power of the plurality of battery clusters is determined according to the required power and the first priority sequence, which can allocate appropriate charging and discharging power to the battery cluster, improve the calibration performance of the energy storage system, and improve the overall efficiency of the energy storage system while improving the reliability of the energy storage system.In a case where the first SOC value is greater than the first threshold value and the SOC difference value is greater than the second threshold value, the first battery cluster is controlled to perform SOC low-end static calibration, that is, in a case where the SOC imbalance degree between the battery cells of the first battery cluster is large, calibration through SOC low-end static calibration can realize SOC balancing between the battery cells of the first battery cluster while reducing the risk of overcharging of the first battery cluster; in a case where the first SOC value is greater than the first threshold value and the SOC difference value is less than or equal to the second threshold value, in a case where the first battery cluster is controlled to perform SOC low-end static calibration or SOC full-charging calibration, SOC balancing of the battery cells in the first battery cluster is realized through SOC low-end static calibration or SOC full-charging calibration, so as to improve the calibration performance of the overall energy storage system.

[0062] Figure 1 A schematic diagram of an energy storage system 100 according to an embodiment of the present application is shown. Figure 2 A flowchart of a calibration method 200 of an energy storage system according to an embodiment of the present application is shown.

[0063] As shown in Figure 1 The energy storage system 100 includes a plurality of battery clusters 120, which can be connected in series to improve the total voltage of the energy storage system 100; the plurality of battery clusters 120 can also be connected in parallel to improve the total capacity and current capacity of the energy storage system 100; or the plurality of battery clusters 120 can also be connected in series-parallel to balance the capacity and voltage requirements, which is not limited in the present application.

[0064] In an embodiment of the present application, one row or one column of battery devices 121 is divided into a plurality of battery clusters 120, and the plurality of battery clusters 120 are connected in parallel. This arrangement of the battery clusters 120 not only can better decompose a large-capacity energy storage system 100, but also can make the size of the energy storage system 100 a standard size, thereby reducing the transportation cost of the energy storage system 100. That is, the embodiment of the present application is conducive to the standardization of the energy storage system 100 and the reduction of transportation costs.

[0065] The energy storage system 100 can include N columns of battery devices 121, and one column of battery devices 121 is divided into at least two battery clusters 120 connected in parallel, each battery cluster 120 includes at least one battery device 121, and N is greater than or equal to 1.

[0066] Alternatively, the energy storage system 100 can include N rows of battery devices 121, and one row of battery devices 121 is divided into at least two battery clusters 120 connected in parallel, each battery cluster 120 includes at least one battery device 121, and N is greater than or equal to 1.

[0067] In some embodiments, as Figure 1As shown, the plurality of battery devices 121 can include four columns of battery devices 121, each column of battery devices 121 can be divided into two battery clusters 120 in parallel, each battery cluster 120 can include four battery devices 121, and each battery device 121 can include four battery cells connected in series.

[0068] In other words, the arrangement of the battery cluster 120 in the embodiment of the present application is an arrangement of four columns and eight clusters, which can better decompose a 6MWh large-capacity energy storage system.

[0069] Alternatively, the plurality of battery devices 121 can include four rows of battery devices 121, each row of battery devices 121 can be divided into two battery clusters 120 in parallel, each battery cluster 120 includes four battery devices 121, and each battery device 121 includes four battery cells connected in series.

[0070] Of course, the energy storage system 100 in the embodiment of the present application can also include other numbers of battery clusters 120. For example, the energy storage system 100 can also include two columns of battery devices 121, each column of battery devices 121 is divided into four battery clusters 120 in parallel. At this time, one battery cluster 120 can include two battery devices 121, and each battery device 121 can include four battery cells connected in series. Alternatively, the energy storage system 100 can also include one column of battery devices 121, each column of battery devices 121 is divided into eight battery clusters 120 in parallel. Or, each column of battery devices 121 can be divided into three battery clusters 120 in parallel.

[0071] It should be understood that the following of the present application are all exemplified by parallel connection between the plurality of battery clusters 120.

[0072] Exemplarily, the energy storage system 100 further includes a master battery management unit (MBMU), which is usually located at the battery cluster 120 level, and one energy storage system 100 can contain multiple MBMUs, for example, one MBMU corresponds to each cluster. Among them, the MBMU can receive all the battery cell voltage, temperature, current and other data uploaded by the SBMU. The MBMU can also calculate the SOC and SOH of the battery cluster 120. In addition, the MBMU can also detect overvoltage, undervoltage, overcurrent, temperature abnormalities, etc., and trigger hierarchical protection.

[0073] Exemplarily, the energy storage system 100 further includes SBMU, which is installed at the battery device 121 or battery cell level, and one MBMU can manage multiple SBMUs, for example, one battery cluster 120 contains 10 battery devices 121, and each battery device 121 is equipped with one SBMU. Among them, the SBMU can be used to measure the voltage or current of the battery cell, etc.

[0074] According to some embodiments of the present application, optionally, as shown in Figure 2 The calibration method one 200 of the energy storage system includes the following contents: S210: Obtain the demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters.

[0075] S220: Determine the charging and discharging power of the plurality of battery clusters according to the demand power and the first priority sequence.

[0076] S230: Control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging power.

[0077] Specifically, the execution subject of the calibration method one 200 embodiment can be a battery management system (BMS), and more specifically, the execution subject of the calibration method one 200 embodiment can be an MBMU. It should be understood that the present application embodiment takes the MBMU as an example for description.

[0078] The demand power refers to the active power value (usually in kW or MW) required by the external instruction to be emitted or absorbed by the energy storage system at a certain moment or a certain time period or in a time period. The demand power can be understood as an action instruction for explicitly indicating what the energy storage system should do at the current moment and how much, or explicitly indicating how much the energy storage system should charge and discharge at the current moment and how much the charging and discharging power is.

[0079] For example, a positive demand power value can represent a requirement for the energy storage system to discharge and provide power to the grid or load. For example, +500 kW represents discharging at a power of 500 kW. A negative demand power value can represent a requirement for the energy storage system to charge and absorb power from the grid or power supply. For example, -300 kW represents charging at a power of 300 kW. A zero demand power value can represent a requirement for the energy storage system to standby, neither charging nor discharging.

[0080] The demand power can be automatically generated by an energy management system (EMS) to generate a demand power instruction; it can also come from a local smart meter or controller on the user side (such as a factory, a mall, a data center); in addition, when the energy storage system participates in grid auxiliary services, its demand power can directly come from the grid dispatching center.

[0081] The first priority sequence is determined according to a plurality of first SOC values, and specifically, the charging and discharging of the energy storage system are described in detail: In a case that the energy storage system is charging, the MBMU obtains a plurality of first SOC values of a plurality of battery clusters, wherein the plurality of battery clusters correspond to the plurality of SOC values one by one, and the MBMU can sort the plurality of first SOC values. For example, the plurality of first SOC values can be sorted in ascending order. For example, the energy storage system includes battery cluster A, battery cluster B, and battery cluster C, and the corresponding first SOC values are 20%, 30%, and 50%, respectively. The first priority sequence is 50%, 30%, and 20%.

[0082] In another case that the energy storage system is discharging, the MBMU obtains a plurality of first SOC values of a plurality of battery clusters, and the MBMU can sort the plurality of first SOC values. For example, the plurality of first SOC values can be sorted in descending order. For example, the energy storage system includes battery cluster A, battery cluster B, and battery cluster C, and the corresponding first SOC values are 20%, 30%, and 50%, respectively. The first priority sequence is 20%, 30%, and 50%.

[0083] It should be understood that the first priority sequence can also be sorted in other ways according to the plurality of first SOC values, and the present application does not limit the same.

[0084] In the above S220, the MBMU determines the charging and discharging power of the plurality of battery clusters according to the demand power and the first priority sequence. The demand power is distributed according to the first priority sequence to form the charging and discharging power corresponding to the first priority sequence.

[0085] For example, the energy storage system includes battery cluster A, battery cluster B, and battery cluster C, and the corresponding first SOC values are 20%, 30%, and 50%, respectively. During the charging process of the energy storage system, the demand power is 1000W. The demand power is inversely proportional to the first SOC value, that is, the higher the first SOC value, the less demand power is allocated to the first battery cluster, which can reduce the difference between the plurality of battery clusters. For example, the demand power can be divided into three parts, for example, the MBMU can divide the demand power into 100W, 300W, and 600W, and the 100W, 300W, and 600W are the charging and discharging power of the battery cluster A, the battery cluster B, and the battery cluster C, respectively.

[0086] For another example, the energy storage system includes battery cluster A, battery cluster B, and battery cluster C, and the corresponding first SOC values are 20%, 30%, and 50%, respectively. During discharging of the energy storage system, the demand power is 1000W, and the demand power is proportional to the first SOC value, that is, the higher the first SOC value, the more demand power allocated to the corresponding first battery cluster, which can reduce the difference between the plurality of battery clusters. For example, the demand power can be divided into three parts, for example, the MBMU can divide the demand power into 600W, 300W, and 100W, and the 600W, 300W, and 100W are the charging and discharging power of the battery cluster A, the battery cluster B, and the battery cluster C, respectively.

[0087] Among them, the demand power can also be divided according to the number of battery clusters, and can also be allocated in an increasing manner, or can also be allocated in a decreasing manner, and the present application does not make any limitation.

[0088] Optionally, the MBMU can calculate the maximum allowed charging and discharging power of each battery cluster in the plurality of battery clusters in real time, and the charging power can also be determined according to the demand power, the first priority sequence, and the maximum allowed charging and discharging power. For example, the EMS issues a total demand power instruction to the energy storage system, such as discharging 1000kW. The MBMU calculates the maximum allowed charging and discharging power of each battery cluster. Among them, the maximum allowed charging and discharging power can change in real time based on SOC, temperature, SOH, voltage and other parameters. According to the plurality of first SOC values, the demand power is allocated to each battery cluster, which can be divided into two cases after allocation: One case is that the demand power allocated to each battery cluster is less than or equal to the maximum allowed charging and discharging power, and the energy storage system can perform discharging according to the demand power.

[0089] Another case is that the demand power allocated to each battery cluster is greater than the maximum allowed charging and discharging power, and the energy storage system cannot meet the demand, and discharges according to the maximum allowed charging and discharging power.

[0090] In the above S230, the MBMU controls the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging power. For example, the MBMU controls the plurality of battery clusters to perform charging according to the charging and discharging power. For example, the battery cluster A in the plurality of battery clusters is taken as an example, and the battery cluster A is calibrated in the case that the battery cluster A has not been calibrated for a long time or meets the calibration condition during charging. For example, in the case that the battery cluster A has not been calibrated for a long time, the time can be sent to the MBMU, and the MBMU can control the battery cluster A to perform calibration. For another example, the battery cluster A can be calibrated in the case that the battery cluster meets the SOC full charging calibration condition.

[0091] It should be understood that the MBMU includes a set flag for the battery cluster A, and the set flag for the battery cluster A can be cleared after the battery cluster A is calibrated, and the set flag for the battery cluster A can be accumulated with the charging and discharging cycles when the battery cluster A is not calibrated for a plurality of charging and discharging cycles. The MBMU can control the battery cluster A to calibrate according to the number of set flags.

[0092] In the method, the MBMU controls a plurality of battery clusters to calibrate, and the calibration mode can include SOC calibration, SOH calibration, and SOC equalization.

[0093] Optionally, the MBMU can determine the working condition of the energy storage system, and then determine whether to calibrate. Specifically, the working condition of the energy storage system can be divided into frequency regulation and peak regulation. When the working condition of the energy storage system is frequency regulation, the MBMU controls a plurality of battery clusters to calibrate according to the charging and discharging power. The MBMU can determine the working condition of the energy storage system according to the charging and discharging power, the SOC fluctuation range, and the SOC static time of the plurality of battery clusters in the historical time.

[0094] Specifically, when the working condition is frequency regulation, the power instruction received by the PCS can change every second, and quickly and randomly switches between discharging and charging. The power value can be switched from full power discharging to full power charging at a moment. Since the charging and discharging action time is very short each time, the SOC only fluctuates in a small range (for example, 50%±5%) back and forth, and the energy storage system maintains the SOC at an intermediate level to ensure enough space for bidirectional (charging / discharging) adjustment. In addition, in the case of frequency regulation, the energy storage system has almost no static time and is always in standby and working state.

[0095] It should be understood that the traditional SOC / SOH calibration algorithm (such as ampere-hour integration method) will accumulate errors over time due to factors such as sensor slight drift, inaccurate coulomb efficiency estimation, self-discharge, etc. After a long time of operation, the displayed SOC can be greatly deviated from the true SOC.

[0096] Compared with the calibration method by ampere-hour integration, the application can determine the charging and discharging power of the plurality of battery clusters according to the demand power, control the plurality of battery clusters to calibrate according to the charging and discharging power, that is, the plurality of battery clusters in the energy storage system can calibrate at the end of charging and discharging, reset the starting point of ampere-hour integration, reduce the cumulative error of the plurality of battery clusters, and improve the accuracy of calibration. Secondly, according to the demand power and the first priority sequence, the charging and discharging power of the plurality of battery clusters is determined, and the plurality of battery clusters is controlled to calibrate according to the charging and discharging power. This process can level the SOC difference between different battery clusters. At this time, the energy storage system is not idle to calibrate the SOC and / or SOH, but completes the calibration while charging and discharging, improves the operation and maintenance efficiency, and ensures the reliability of the energy storage system. In addition, according to the demand power and the first priority sequence, the charging and discharging power of the plurality of battery clusters can be determined to allocate the appropriate charging and discharging power to the battery cluster, so as to improve the calibration performance of the energy storage system, thereby improving the overall efficiency of the energy storage system while improving the reliability of the energy storage system.

[0097] Figure 3 A flowchart of a calibration method two 300 of an energy storage system according to an embodiment of the application is shown.

[0098] According to some embodiments of the application, the energy storage system can optionally include a plurality of battery clusters, and the plurality of battery clusters can include a first battery cluster. The calibration method two 300 of the energy storage system can include the following contents: Figure 3 S310: obtaining a demand power and a first priority sequence of a plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each first SOC value in the plurality of first SOC values corresponding to one battery cluster in the plurality of battery clusters.

[0099] S320: determining charging and discharging power of the plurality of battery clusters according to the demand power and the first priority sequence.

[0100] S330: controlling the plurality of battery clusters to calibrate the SOC and / or SOH according to the charging and discharging power, the SOC calibration including SOC low-end static calibration and SOC full-charge calibration.

[0101] S340: controlling the first battery cluster to calibrate the SOC in a case where the charging and discharging power of the first battery cluster is lower than a power threshold.

[0102] S350: obtaining an SOC difference value between a plurality of battery monomers of the first battery cluster.

[0103] S360: controlling the first battery cluster to calibrate the SOC low-end static calibration in a case where the first SOC value is greater than a first threshold and the SOC difference value is greater than a second threshold.

[0104] ​S370: In the case that the first SOC value is greater than the first threshold value and the SOC difference value is less than or equal to the second threshold value, the first battery cluster is controlled to perform SOC low-end standing calibration or SOC full-charge calibration.

[0105] Specifically, the execution subject of the second calibration method 300 embodiment can be a battery management system (BMS), and more specifically, the execution subject of the second calibration method 300 embodiment can be an MBMU. It should be understood that the embodiments of the present application take the MBMU as an example for description.

[0106] Figure 4 A flowchart of a third calibration method 400 of the energy storage system according to an embodiment of the present application is shown.

[0107] According to some embodiments of the present application, the third calibration method 400 of the energy storage system can optionally include the following content, as shown in the figure: Figure 4 According to some embodiments of the present application, the third calibration method 400 of the energy storage system can optionally include the following content, as shown in the figure: According to the demand power and the first priority sequence, the charging and discharging power of the plurality of battery clusters is determined, including: S410: According to the demand power, the first priority sequence and the plurality of weight proportion values, the charging and discharging power of the plurality of battery clusters is determined; wherein each weight proportion value in the plurality of weight proportion values corresponds to one of the plurality of first SOC values.

[0108] Specifically, the execution subject of the third calibration method 400 embodiment can be a battery management system BMS, and more specifically, the execution subject of the third calibration method 400 embodiment can be an MBMU. It should be understood that the embodiments of the present application take the MBMU as an example for description.

[0109] For example, taking the charging of the energy storage system as an example, the energy storage system includes battery cluster A, battery cluster B and battery cluster C, the corresponding first SOC values are 20%, 30% and 50% respectively, the first priority sequence is 20%, 30% and 50%, and the weight proportion value can be decreased, for example, the weight proportion value can be 50%, 30%, 20%. Assuming that the demand power is 1000W, the final charging and discharging power of the battery cluster A, the battery cluster B and the battery cluster C is 500W, 300W and 200W respectively.

[0110] For example, taking the discharging of the energy storage system as an example, the energy storage system includes battery cluster A, battery cluster B and battery cluster C, the corresponding first SOC values are 20%, 30% and 50% respectively, the first priority sequence is 50%, 30% and 20%, and the weight proportion value can be decreased, for example, the weight proportion value can be 50%, 30%, 20%. Assuming that the demand power is 1000W, the final charging and discharging power of the battery cluster A, the battery cluster B and the battery cluster C is 200W, 300W and 500W respectively.

[0111] It should be understood that the weight proportion value can be increased, decreased, proportionally increased, proportionally decreased, or set according to actual conditions, and the present application does not make any limitation on this.

[0112] It should also be understood that each weight proportion value in the plurality of weight proportion values corresponds to one of the plurality of first SOC values, or is described as one-to-one correspondence between the plurality of weight proportion values and the plurality of first SOC values.

[0113] In the scheme of the embodiment of the present application, the charging and discharging power of the plurality of battery clusters is determined according to the demand power, the first priority sequence and the plurality of weight proportion values, which can further allocate a suitable charging and discharging power to each battery cluster in the plurality of battery clusters. The calibration according to the charging and discharging power can reduce the SOC difference between the battery clusters in the energy storage system, improve the SOC consistency of the energy storage system, and improve the accuracy of the remaining available energy ratio of the energy storage system and the SOC availability of the energy storage system. In addition, the calibration performance of the energy storage system can also be improved, thereby improving the overall efficiency of the energy storage system while improving the reliability of the energy storage system.

[0114] Figure 5 A flowchart of a calibration method four 500 of an energy storage system according to an embodiment of the present application is shown.

[0115] According to some embodiments of the present application, the calibration method four 500 of the energy storage system can optionally include the following content as shown in Figure 5 According to some embodiments of the present application, the calibration method four 500 of the energy storage system can optionally include the following content as shown in The charging and discharging power of the plurality of battery clusters is determined according to the demand power, the first priority sequence and the plurality of weight proportion values, which can further allocate a suitable charging and discharging power to each battery cluster in the plurality of battery clusters. The calibration according to the charging and discharging power can reduce the SOC difference between the battery clusters in the energy storage system, improve the SOC consistency of the energy storage system, and improve the accuracy of the remaining available energy ratio of the energy storage system and the SOC availability of the energy storage system. In addition, the calibration performance of the energy storage system can also be improved, thereby improving the overall efficiency of the energy storage system while improving the reliability of the energy storage system. S510: According to the first priority sequence and the plurality of weight proportion values, the demand power is allocated to determine the charging and discharging power of the plurality of battery clusters.

[0116] Specifically, the execution subject of the calibration method four 500 embodiment can be a BMS, and more specifically, the execution subject of the calibration method four 500 embodiment can be an MBMU. It should be understood that the present application takes the MBMU as an example for illustration.

[0117] For example, taking the charging of the energy storage system as an example, the energy storage system includes battery cluster A, battery cluster B and battery cluster C, the corresponding first SOC values are 20%, 30% and 50% respectively, the first priority sequence is 20%, 30% and 50%, and the weight proportion value can be decreased, for example, the weight proportion value can be 50%, 30%, 20%. The demand power is assumed to be 1000W, and the final charging and discharging power of the battery cluster A, the battery cluster B and the battery cluster C is 500W, 300W and 200W respectively.

[0118] For example, taking the discharge of the energy storage system as an example, the energy storage system includes battery cluster A, battery cluster B, and battery cluster C, the corresponding first SOC values are 20%, 30%, and 50%, respectively, the first priority sequence is 50%, 30%, and 20%, the weight ratio values can be decreased, for example, the weight ratio values can be 50%, 30%, and 20%, and the demand power is assumed to be 1000W, and then the final charging and discharging power of the battery cluster A, the battery cluster B, and the battery cluster C is 200W, 300W, and 500W.

[0119] In the scheme of the embodiments of the present application, the demand power is allocated according to the first priority sequence and the plurality of weight ratio values to determine the charging and discharging power of the plurality of battery clusters, respectively, which can further allocate a more suitable charging and discharging power to each battery cluster in the plurality of battery clusters, and the calibration according to the charging and discharging power can reduce the SOC difference between the battery clusters in the energy storage system, improve the SOC consistency of the energy storage system, and improve the accuracy of the remaining available energy ratio of the energy storage system and the SOC availability of the energy storage system. In addition, the calibration performance of the energy storage system can also be improved, thereby improving the overall performance of the energy storage system while improving the reliability of the energy storage system.

[0120] According to some embodiments of the present application, optionally, the plurality of battery clusters includes a first battery cluster, and in a case where the charging and discharging power of the first battery cluster is lower than a power threshold, the first battery cluster is controlled to perform SOC calibration.

[0121] It should be understood that, in a case where the charging and discharging power of the first battery cluster is lower than the power threshold, it means that the MBMU allocates less charging and discharging power to the first battery cluster or even 0, for example, in a case where the demand power itself is low, the MBMU can not allocate charging and discharging power to part of the first battery cluster, so that it is in a waiting state or a resting state, at this time, the MBMU can control the first battery cluster to perform SOC calibration, that is, to calibrate the first battery cluster without affecting the normal charging and discharging of the energy storage system.

[0122] Optionally, in the embodiments of the present application, the MBMU can determine whether the first battery cluster performs SOC full-charge calibration or SOC low-end stationary calibration according to the first SOC value of the first battery cluster.

[0123] Specifically, in a case where the first SOC value of the first battery cluster meets a full-charge condition or is closer to the full-charge condition, the MBMU controls the first battery cluster to perform SOC full-charge calibration; and in a case where the first SOC value of the first battery cluster meets a low-end stationary calibration condition or is closer to the low-end stationary calibration condition, the MBMU can control the first battery cluster to perform SOC low-end stationary calibration.

[0124] SOC full charge calibration refers to a process of charging the battery cluster to 100% full state of charge, and using this known, determined physical state point (full charge point) to reset the SOC estimation value in the MBMU. When the battery cluster reaches the charge cut-off condition (satisfying both the cut-off voltage and the cut-off current), its true SOC is 100%. The MBMU can force the display value and the calculated value of the SOC to be reset to 100%, and clear all errors accumulated by the previous ampere-hour integration method.

[0125] SOC low end static calibration refers to a process of correcting the SOC estimation value by measuring the open circuit voltage (OCV) of the battery cluster when the battery cluster is discharged to a lower SOC interval and left for a long enough time. After the battery cluster is left for a period of time, its internal chemical state tends to be stable. The MBMU queries the pre-stored OCV-SOC correspondence table according to the measured OCV, and corrects the current SOC to the value obtained by the table lookup.

[0126] It should also be understood that, taking the lithium iron phosphate battery as an example, due to its electrochemical characteristics, there is a platform region, and there is no correspondence between the SOC and the OCV in the platform region, so accurate calibration cannot be performed, and therefore full charge or low end static calibration is required to calibrate the SOC.

[0127] The power threshold is a value or a numerical range set when the charge and discharge power of the battery cluster is low, which can be set to 0, or can be set to 10, or can be set to 0-10, or can be set according to actual conditions, and the present application does not make any limitation on this.

[0128] In the scheme of the embodiments of the present application, in the case that the charge and discharge power of the first battery cluster is lower than the power threshold, that is, in the case that the charge and discharge power of the first battery cluster is low or even zero, the SOC of the first battery cluster can be calibrated to improve the consistency of the intra-cluster SOC of the first battery cluster, and at the same time, the calibration performance of the entire energy storage system can be improved to improve the reliability of the energy storage system.

[0129] Figure 6 A flowchart of a calibration method five 600 of an energy storage system according to an embodiment of the present application is shown.

[0130] According to some embodiments of the present application, as shown in Figure 6 The calibration method five 600 of the energy storage system includes the following contents: The SOC calibration includes SOC low end static calibration and SOC full charge calibration, and in the case that the charge and discharge power of the first battery cluster is lower than the power threshold, the SOC of the first battery cluster is controlled to be calibrated, including: S610: Obtain the SOC difference between the plurality of battery monomers of the first battery cluster.

[0131] S620: In a case where the first SOC value is greater than the first threshold value and the SOC difference value is greater than the second threshold value, controlling the first battery cluster to perform SOC low-end standing calibration.

[0132] S630: In a case where the first SOC value is greater than the first threshold value and the SOC difference value is less than or equal to the second threshold value, controlling the first battery cluster to perform SOC low-end standing calibration or SOC full-charge calibration.

[0133] Specifically, the execution subject of the calibration method five 600 embodiment can be a BMS, and more specifically, the execution subject of the calibration method five 600 embodiment can be an MBMU. It should be understood that the present application embodiment takes the MBMU as an example for description.

[0134] The SOC difference value is due to the internal parameter difference of the battery cells in the first battery cluster caused by manufacturing process, use environment, and aging degree, for example, the SOC difference value is caused by the imbalance of the capacity, internal resistance, or self-discharge rate of the battery cells.

[0135] Specifically, in the present application embodiment, the SOC difference value can be calculated as the range or standard deviation of the SOC of each battery cell in the plurality of battery cells in the first battery cluster estimated by the algorithm of the MBMU. For example, the SOC range exceeding 5% can be considered as a high degree of imbalance between the battery cells.

[0136] Alternatively, the MBMU can also obtain the voltage range of the plurality of battery cells in the first battery cluster, and control the first battery cluster to perform which calibration according to the voltage range and the first SOC value. The voltage range can be the difference between the highest battery cell voltage and the lowest battery cell voltage in the first battery cluster. In addition, the greater the range, the higher the degree of imbalance between the battery cells.

[0137] Alternatively, the MBMU can also obtain the voltage standard deviation or variance of the plurality of battery cells in the first battery cluster, and control the first battery cluster to perform which calibration according to the voltage standard deviation or variance and the first SOC value.

[0138] It should be understood that the first SOC value greater than the first threshold value means that the first SOC value of the first battery cluster has a high degree of inaccuracy, that is, the first threshold value is a parameter for measuring the accuracy of the first SOC value, and its range can be set according to the actual situation, for example, the first threshold value can be set to 90%, or the first threshold value can be set to 10%.

[0139] It should also be understood that the second threshold is the SOC difference threshold. Values ​​greater than the second threshold indicate a high degree of imbalance among the individual cells in the first battery cluster, requiring low-end static calibration to reduce the SOC values ​​of cells exceeding the second threshold for calibration. The second threshold can be set according to actual conditions; for example, it can be set to 5%, 7%, or a range, such as 5%-7%. This application does not impose any limitations on this.

[0140] In S630 above, when the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold, the first battery cluster is controlled to perform either low-end static calibration or full-charge calibration. That is, when the inaccuracy of the first SOC value is high and the imbalance between battery cells in the first battery cluster is low, full-charge calibration can be performed by continuing to charge until full charge is achieved, because the imbalance between battery cells is low and continuing to charge will not cause the risk of overcharging some battery cells. Alternatively, discharge can be performed for low-end static calibration to balance the multiple battery cells in the first battery cluster.

[0141] In the embodiments of this application, when the first SOC value is greater than the first threshold and the SOC difference is greater than the second threshold, the first battery cluster is controlled to perform low-end static calibration. That is, when the SOC imbalance between the individual cells of the first battery cluster is large, calibration by low-end static calibration can achieve SOC balance between the individual cells of the first battery cluster while reducing the risk of overcharging of the first battery cluster. When the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold, the first battery cluster is controlled to perform low-end static calibration or full-charge calibration. In this case, SOC balance of the individual cells in the first battery cluster is achieved by low-end static calibration or full-charge calibration, thereby improving the overall calibration performance of the energy storage system.

[0142] Figure 7 A schematic flowchart of a calibration method 6700 for an energy storage system according to an embodiment of this application is shown.

[0143] According to some embodiments of this application, optionally, the plurality of battery clusters includes a second battery cluster, such as... Figure 7 As shown, the calibration method 6700 for this energy storage system includes the following: Before controlling multiple battery clusters to undergo SOC and / or SOH calibration based on charge / discharge power, the following steps are included: S710: Obtain the calibration status information and the second priority sequence of the second battery cluster. The second priority sequence is determined according to the calibration mode.

[0144] S720: determining the corresponding calibration mode in the second priority sequence according to the calibration state information.

[0145] S730: performing calibration on the second battery cluster according to the corresponding calibration mode in the second priority sequence according to the calibration mode; wherein the calibration mode includes SOC full charging calibration, SOC low end static calibration state, SOC low end static calibration state, SOH full charging state, SOH low end static calibration state, SOH low end static calibration state, SOC balancing state and normal state, and the calibration state information includes SOC calibration, SOH calibration and SOC balancing.

[0146] Specifically, the execution subject of the sixth calibration method 700 embodiment can be a BMS, and more specifically, the execution subject of the sixth calibration method 700 embodiment can be an MBMU. It should be understood that the embodiments of the present application take the MBMU as an example for description.

[0147] The second priority sequence is determined according to the calibration mode, and the calibration mode includes SOC full charging calibration, SOC low end static calibration state, SOC low end static calibration state, SOH full charging state, SOH low end static calibration state, SOH low end static calibration state, SOC balancing state and normal state. Specifically, the first priority sequence can be divided into two kinds according to the charging and discharging of the energy storage system: One possible implementation, in the case of charging the energy storage system, since the SOH calibration period is long, the SOH full charging state can be placed in the first place in the charging scenario to complete the calibration first; secondly, in the process of charging, after reaching full charging, SOC full charging calibration can be performed, therefore, the SOC full charging calibration state can be placed in the second place, after the SOC full charging calibration is completed, SOC balancing can be performed to balance the plurality of first SOC values between the plurality of battery clusters, therefore, it can be set in the third place, and in the process of charging, after completing the above three calibrations, it enters the normal state, i.e. the normal charging and discharging state.

[0148] Another possible implementation, in the case of discharging the energy storage system, SOH low end static calibration can be performed first, which is placed in the first place, secondly, in the process of static, SOC low end static calibration state can be performed, therefore, it can be placed in the second place, after the MBMU controls the battery cluster to perform the above calibration, SOC balancing is performed to balance and calibrate the plurality of first SOC values of the plurality of battery clusters, therefore, it is set in the third place, and in the process of discharging, after completing the above three calibrations, it enters the normal state, i.e. the normal charging and discharging state.

[0149] Optionally, the second priority sequence can be illustrated by the following Table 1: Table 1

[0150] It should be understood that the second priority sequence in Table 1 from top to bottom is the charging and discharging case respectively, that is, the calibration mode in the uppermost position has the highest priority, and the calibration mode in the lowest position has the lowest priority.

[0151] Optionally, during the charging process, after reaching the normal state, the subsequent calibration in Table 1, that is, the calibration in the discharging process, can also be performed to improve the calibration performance. It should be understood that in the actual calibration, the calibration after the normal state can not occur.

[0152] Optionally, during the discharging process, after reaching the normal state, the subsequent calibration in Table 1, that is, the calibration in the charging process, can also be performed to improve the calibration performance. It should be understood that in the actual calibration, the calibration after the normal state can also not occur.

[0153] Among them, the SOC equalization refers to when the MBMU detects that the SOC values of each battery monomer in the multiple battery clusters are inconsistent during the charging process of the energy storage system, the charging current is adjusted, the battery monomer with a lower SOC value obtains a larger charging current, and the battery monomer with a higher SOC value has a smaller charging current, so that the SOC values of each battery monomer gradually equalize during the charging process. It should be understood that the discharging process is similar to the charging process, which will not be described here.

[0154] SOH full charge calibration refers to recalibrating and calculating the SOH of the battery pack by a complete charging process, usually from low SOC to 100% full charge state.

[0155] SOH low end static calibration refers to recalibrating SOH by a complete discharging process to the cutoff condition and static state.

[0156] SOC low end static calibration state refers to the process state in the SOC low end static calibration, that is, it can be understood that the final goal in the entire calibration process is to obtain an accurate SOC value.

[0157] SOH low end static calibration state refers to the process state in the SOH low end static calibration, that is, it can be understood that the final goal in the entire calibration process is to obtain an accurate SOH value.

[0158] The MBMU determines the corresponding calibration mode in the second priority sequence according to the calibration state information. Specifically, the MBMU obtains the calibration state information of each battery cluster, which can be divided into the following cases according to the calibration state information of the battery cluster: One case: when the MBMU receives the calibration state information of the second battery cluster in the plurality of battery clusters as SOH calibration, first switch the second battery cluster to SOH low end static calibration state, the charge and discharge priority can refer to Table 1. When the MBMU monitors the first SOC value of the second battery cluster reaches the SOC low end, the MBMU controls the state of the second battery cluster to switch to the SOH low end static calibration state, and the charge and discharge priority can refer to Table 1. When the SOC calibration is completed, switch to the SOH full charge state, and the charge and discharge priority can refer to Table 1. After reaching full charge, SOH completes calibration, and the average SOC is compared. If it is too high, switch to the SOC equalization discharge state for equalization. The average SOC refers to the average value of the calibrated SOC values of the plurality of battery clusters.

[0159] Another case: when the MBMU receives the calibration state information of the second battery cluster in the plurality of battery clusters as SOC calibration, the MBMU determines whether to perform SOC full charge calibration state or SOC low end static calibration state according to the first SOC value and the unbalanced degree of the plurality of battery monomers in the second battery cluster. It should be understood that the determination process is consistent with the above-mentioned embodiment, and this embodiment will not be repeated here.

[0160] One possible implementation: when in the SOC full charge calibration state, the charge and discharge priority can refer to Table 1. After reaching full charge, SOH completes calibration. At this time, the SOC value obtained after calibration can also be compared with the average SOC value. If it is too high, the MBMU controls the second battery cluster to switch to the SOC equalization discharge state.

[0161] Another possible implementation: when in the SOC low end static calibration state, the charge and discharge priority can refer to Table 1. When reaching the SOC low end, the MBMU controls the state of the second battery cluster to switch to the SOC low end static calibration state, and the charge and discharge priority can refer to Table 1. When the calibration is completed, the MBMU controls the second battery cluster to switch to the SOC full charge state, and the charge and discharge priority can refer to Table 1. After reaching full charge, SOC completes calibration. The SOC value after calibration is compared with the average SOC. The MBMU can switch the second battery cluster to the SOC equalization charge and discharge state according to the difference.

[0162] In another case, when the MBMU receives the calibration state information of the second battery cluster in the plurality of battery clusters as the SOC equalization state, the MBMU determines to allocate the SOC discharge state or the SOC charging state according to the difference between the currently obtained SOC value and the average SOC, and allocates the discharge state if the SOC is too high, or allocates the charging state if the SOC is too low. Specifically, when the second battery cluster is in the SOC discharge state, the charging and discharging priority is shown in Table 1, and when the SOC difference is reduced to the allowable range, the MBMU controls the second battery cluster to switch the mode to the normal state. When the control unit is in the SOC charging state, the charging and discharging priority is shown in Table 1, and when the SOC difference is reduced to the allowable range, the MBMU controls the second battery cluster to switch the mode to the normal state.

[0163] Optionally, after the MBMU performs calibration of the second battery cluster in the corresponding calibration mode in the second priority sequence according to the calibration mode, the MBMU can complete the complete plurality of calibrations according to the priority in Table 1 until the MBMU detects the normal state, so as to achieve more accurate calibration for various calibrations, thereby improving the safety and reliability of the energy storage system.

[0164] Optionally, after the above SOC and / or SOH calibration is performed, the MBMU can further obtain the first SOC value of the plurality of battery clusters, and perform power distribution according to the first SOC value. The specific distribution process can be referred to the calibration method one 200, so as to further improve the overall consistency.

[0165] Optionally, the MBMU can also perform the above calibration method six 700 after performing the SOC and / or SOH calibration of the plurality of battery clusters according to the charging and discharging power.

[0166] In the scheme of the embodiments of the present application, the calibration of the second battery cluster in the corresponding calibration mode in the second priority sequence according to the calibration state information of the second battery cluster can more accurately calibrate the second battery cluster, and improve the calibration efficiency, thereby improving the calibration performance of the energy storage system.

[0167] According to some embodiments of the present application, optionally, the second priority sequence is determined according to the calibration accuracy and / or calibration period of the plurality of battery clusters.

[0168] For example, taking the charging of the energy storage system as an example, the SOH full-charge calibration has the longest period and the fastest aging, and the priority thereof is set to be the highest, so that the calibration can be performed preferentially.

[0169] For example, taking the charging of the energy storage system as an example, in the calibration of the historical battery cluster, different calibration modes are tested in different sequences, and the second priority sequence is determined according to the final calibration accuracy.

[0170] In the scheme of the embodiment of the present application, the second priority sequence is determined according to the calibration accuracy and / or calibration period of the plurality of battery clusters, and the calibration efficiency can be improved and the calibration cost can be reduced through the second priority sequence, the energy storage system can be continuously maintained in the best performance state, thereby maximizing the whole life cycle of the energy storage system and ensuring the safe and reliable operation of the energy storage system.

[0171] Figure 8 A flowchart of a calibration method seven 800 of an energy storage system according to an embodiment of the present application is shown.

[0172] According to some embodiments of the present application, as shown in Figure 8 The calibration method seven 800 of the energy storage system includes the following contents: After the SOC and / or SOH calibration of the plurality of battery clusters is controlled according to the charge and discharge power, the following includes: S810: Obtain a second SOC value of the plurality of battery clusters.

[0173] S820: Control the plurality of battery clusters to perform SOC inter-cluster balancing according to the second SOC value.

[0174] Specifically, the execution subject of the calibration method seven 800 embodiment can be a BMS, and more specifically, the execution subject of the calibration method seven 800 embodiment can be an MBMU. It should be understood that the MBMU is taken as an example for description in the embodiments of the present application.

[0175] The second SOC value can be the same as the first SOC value, i.e., obtained in the same time period.

[0176] Alternatively, the second SOC value can also be an SOC value obtained by the MBMU after the calibration of the plurality of battery clusters or any battery cluster in the plurality of battery clusters in the energy storage system.

[0177] In the above S820, the MBMU controls the plurality of battery clusters to perform SOC inter-cluster balancing according to the second SOC value. Specifically, the MBMU obtains a plurality of second SOC values of the plurality of battery clusters, can take an average of the plurality of second SOC values, modifies all the second SOC values to the average, or sets a threshold, compares the plurality of second SOC values with the threshold, and adjusts the plurality of second SOC values to be the same as the threshold.

[0178] In the scheme of the embodiment of the present application, the plurality of battery clusters of the energy storage system can be controlled to perform SOC inter-cluster balancing according to the second SOC value, so that the inter-cluster SOC of the plurality of battery clusters of the energy storage system is kept consistent, thereby improving the SOC calibration performance of the whole energy storage system.

[0179] Figure 9 A flowchart of a calibration method eight 900 of an energy storage system according to an embodiment of the present application is shown.

[0180] According to some embodiments of the present application, the energy storage system comprises a plurality of battery clusters, and the calibration method of the energy storage system comprises the following steps: Figure 9 S910: sending a demand power.

[0181] S920: receiving charging and discharging powers of the plurality of battery clusters, the charging and discharging powers being determined according to the demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters.

[0182] S930: sending a power distribution instruction according to the charging and discharging powers.

[0183] Specifically, the execution subject of the calibration method eight 900 embodiment can be a PCS.

[0184] In the above S910, the PCS receives the demand power instruction sent by the EMS, and sends the demand power instruction or the demand power in the demand power instruction to the MBMU or the BMS.

[0185] In the above S920 and S930, the PCS receives the charging and discharging powers of the plurality of battery clusters, and sends the power distribution instruction to the BMS or the MBMU, so that the MBMU performs power distribution, and the MBMU performs calibration according to the distributed charging and discharging powers.

[0186] In the scheme of the embodiments of the present application, compared with the calibration method by ampere-hour integration method, the present application can determine the charging and discharging powers of the plurality of battery clusters according to the demand power, and control the plurality of battery clusters to calibrate according to the charging and discharging powers, that is, the plurality of battery clusters in the energy storage system can calibrate at the end of charging and discharging, reset the starting point of ampere-hour integration, reduce the cumulative error of the plurality of battery clusters, and improve the accuracy of calibration. Secondly, the charging and discharging powers are determined according to the demand power and the first priority sequence of the plurality of battery clusters, which can level the SOC difference between different battery clusters. At this time, the energy storage system is not calibrated only when it is idle, but is calibrated while working, which improves the operation and maintenance efficiency and ensures the reliability of the energy storage system. In addition, the charging and discharging powers of the plurality of battery clusters are determined according to the demand power and the first priority sequence, which can allocate appropriate charging and discharging powers to the battery clusters to improve the calibration performance of the energy storage system, thereby improving the overall efficiency of the energy storage system while improving the reliability of the energy storage system.

[0187] ​The embodiment of the application further provides a power storage system, comprising: a plurality of battery clusters, the plurality of battery clusters comprising a first battery cluster; a first controller configured to acquire a demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; the first controller further configured to determine a charging and discharging power of the plurality of battery clusters according to the demand power and the first priority sequence; the first controller further configured to control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging power, the SOC calibration comprising SOC low-end static calibration and SOC full-charge calibration; and the first controller further configured to control the first battery cluster to perform the SOC calibration when the charging and discharging power of the first battery cluster is lower than a power threshold, comprising: the first controller further configured to acquire an SOC difference between a plurality of battery cells of the first battery cluster; the first controller further configured to control the first battery cluster to perform the SOC low-end static calibration when the first SOC value is greater than a first threshold and the SOC difference is greater than a second threshold; and the first controller further configured to control the first battery cluster to perform the SOC low-end static calibration or the SOC full-charge calibration when the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold.

[0188] It should be understood that the first controller can be a BMS, or in other words, the first controller can be an MBMU.

[0189] The embodiment of the application further provides a power storage system, comprising: a plurality of battery clusters; and a second controller configured to send a demand power; the second controller further configured to receive a charging and discharging power of the plurality of battery clusters, the charging and discharging power being determined according to the demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; and the second controller further configured to send a power distribution instruction according to the charging and discharging power.

[0190] It should be understood that the second controller can be a PCS.

[0191] The calibration method of the power storage system of the embodiment of the application is described in detail above, and the following will be described in combination with Figure 9 The control device of the charging and discharging system of the embodiment of the application is described in detail, and the technical features described in the method embodiment are applicable to the following device embodiment.

[0192] Figure 10 is a schematic block diagram of a calibration device 1000 of a power storage system provided by the embodiment of the application. The power storage system comprises a plurality of battery clusters, and the plurality of battery clusters comprises a first battery cluster. As shown in the figure, Figure 10 The calibration device 1000 of the power storage system comprises: The calibration device 1000 comprises an acquisition unit 1010 and a determination unit 1020.

[0193] The acquisition unit 1010 is configured to acquire a demand power and a first priority sequence of a plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters. The determination unit 1020 is configured to determine a charging and discharging power of the plurality of battery clusters according to the demand power and the first priority sequence.

[0194] The determination unit 1020 is further configured to control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging power, the SOC calibration comprising SOC low-end static calibration and SOC full-charge calibration.

[0195] The determination unit 1020 is further configured to control a first battery cluster to perform SOC calibration in a case where the charging and discharging power of the first battery cluster is lower than a power threshold.

[0196] The determination unit 1020 is further configured to acquire an SOC difference between a plurality of battery cells of the first battery cluster, and control the first battery cluster to perform SOC low-end static calibration in a case where the first SOC value is greater than a first threshold and the SOC difference is greater than a second threshold.

[0197] The determination unit 1020 is further configured to control the first battery cluster to perform SOC low-end static calibration or SOC full-charge calibration in a case where the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold.

[0198] It should be understood that the calibration device 1000 of the energy storage system can implement corresponding operations in any one of the calibration methods 200 to 900 of the energy storage system, and details are not described herein for brevity.

[0199] The embodiments of the present application further provide a chip comprising a processor configured to invoke and run a computer program from a memory.

[0200] Optionally, a device installed with the chip can perform corresponding processes of the control method of the charging and discharging system in the various methods of the embodiments of the present application, and details are not described herein for brevity.

[0201] The embodiments of the present application further provide a computer readable storage medium configured to store a computer program.

[0202] Optionally, the computer readable storage medium can be applied to the control device of the charging and discharging system in the embodiments of the present application, and the computer program, when running on the computer, causes the computer to execute the corresponding procedures implemented by the control device of the charging and discharging system in the various methods of the embodiments of the present application. For the sake of brevity, details are not repeated here.

[0203] The embodiments of the present application further provide a computer program product comprising computer program instructions.

[0204] Optionally, the computer program product can be applied to the control device of the charging and discharging system in the embodiments of the present application, and the computer program instructions, when running on the computer, cause the computer to execute the corresponding procedures implemented by the control device of the charging and discharging system in the various methods of the embodiments of the present application. For the sake of brevity, details are not repeated here.

[0205] The embodiments of the present application further provide a computer program.

[0206] Optionally, the computer program can be applied to the control device of the charging and discharging system in the embodiments of the present application, and when the computer program runs on the computer, the computer executes the corresponding procedures implemented by the control device of the charging and discharging system in the various methods of the embodiments of the present application. For the sake of brevity, details are not repeated here.

[0207] According to some embodiments of the present application, referring to Figures 2 to 10The application provides a calibration method of an energy storage system, the energy storage system comprising a plurality of battery clusters; the calibration method comprising: obtaining a demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; determining charging and discharging powers of the plurality of battery clusters according to the demand power and the first priority sequence; and controlling the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging powers, wherein the plurality of battery clusters comprises a first battery cluster, the SOC calibration comprises SOC low-end static calibration and SOC full-charge calibration, and in a case where the charging and discharging power of the first battery cluster is lower than a power threshold, the SOC calibration of the first battery cluster comprises: obtaining an SOC difference between a plurality of battery cells of the first battery cluster; in a case where the first SOC value is greater than a first threshold and the SOC difference is greater than a second threshold, controlling the first battery cluster to perform the SOC low-end static calibration; and in a case where the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold, controlling the first battery cluster to perform the SOC low-end static calibration or the SOC full-charge calibration. In the scheme of the embodiments of the application, compared with a calibration method such as an ampere-hour integration method, the charging and discharging powers of the plurality of battery clusters can be determined according to the demand power, and the plurality of battery clusters can be controlled to perform calibration according to the charging and discharging powers, that is, the plurality of battery clusters in the energy storage system can perform calibration at the end of charging and discharging, the starting point of ampere-hour integration is reset, the cumulative error of the plurality of battery clusters is reduced, and the accuracy of calibration is improved. Secondly, the charging and discharging powers of the plurality of battery clusters are determined according to the demand power and the first priority sequence, and the plurality of battery clusters are controlled to perform calibration according to the charging and discharging powers, which can level the SOC difference between different battery clusters. At this time, the energy storage system does not only calibrate when it is idle, but also completes calibration while charging and discharging, which improves the operation and maintenance efficiency and ensures the reliability of the energy storage system. In addition, the charging and discharging powers of the plurality of battery clusters can be determined according to the demand power and the first priority sequence, the battery clusters can be allocated to appropriate charging and discharging powers, and the calibration performance of the energy storage system can be improved, so that the overall efficiency of the energy storage system can be improved while the reliability of the energy storage system is improved. In a case where the first SOC value is greater than the first threshold and the SOC difference is greater than the second threshold, the first battery cluster is controlled to perform the SOC low-end static calibration, that is, in a case where the SOC imbalance degree between the battery cells of the first battery cluster is relatively large, the SOC low-end static calibration is performed to balance the SOC between the battery cells of the first battery cluster while reducing the risk of overcharging of the first battery cluster. In a case where the first SOC value is greater than the first threshold and the SOC difference is less than or equal to the second threshold, the first battery cluster is controlled to perform the SOC low-end static calibration or the SOC full-charge calibration, and the SOC of the battery cells in the first battery cluster is balanced by the SOC low-end static calibration or the SOC full-charge calibration to improve the overall calibration performance of the energy storage system.

[0208] Although the present application has been described with reference to preferred embodiments, various modifications can be made to it without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method of calibrating an energy storage system, the method comprising: The energy storage system comprises a plurality of battery clusters, and the plurality of battery clusters comprises a first battery cluster; The calibration method comprises: obtaining a demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; determining charging and discharging powers of the plurality of battery clusters according to the demand power and the first priority sequence; controlling the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging powers, the SOC calibration comprising SOC low-end static calibration and SOC full-charge calibration; in a case where the charging and discharging power of the first battery cluster is lower than a power threshold, controlling the first battery cluster to perform SOC calibration, comprising: obtaining an SOC difference value between a plurality of battery cells of the first battery cluster; in a case where the first SOC value is greater than a first threshold and the SOC difference value is greater than a second threshold, controlling the first battery cluster to perform the SOC low-end static calibration; in a case where the first SOC value is greater than the first threshold and the SOC difference value is less than or equal to the second threshold, controlling the first battery cluster to perform the SOC low-end static calibration or the SOC full-charge calibration.

2. The calibration method of claim 1, wherein, The determination of the charging and discharging powers of the plurality of battery clusters according to the demand power and the first priority sequence comprises: determining the charging and discharging powers of the plurality of battery clusters according to the demand power, the first priority sequence and a plurality of weight proportion values, wherein each of the plurality of weight proportion values corresponds to one of the plurality of first SOC values.

3. The method of calibration of claim 2, wherein, The determination of the charging and discharging powers of the plurality of battery clusters according to the demand power, the first priority sequence and a plurality of weight proportion values comprises: allocating the demand power according to the first priority sequence and the plurality of weight proportion values to determine the charging and discharging powers of the plurality of battery clusters respectively.

4. The calibration method according to any one of claims 1 to 3, characterized in that, The plurality of battery clusters comprises a second battery cluster, and before the control of the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging powers, comprising: obtaining calibration state information and a second priority sequence of the second battery cluster, the second priority sequence being determined according to a calibration mode; determining the calibration mode corresponding to the second priority sequence according to the calibration state information; performing calibration of the calibration mode corresponding to the second priority sequence on the second battery cluster according to the calibration mode; wherein the calibration mode comprises SOC full-charge calibration, SOC low-end static calibration, SOC low-end static calibration, SOH full-charge state, SOH low-end static calibration, SOH low-end static calibration, SOC equalization state and normal state, and the calibration state information comprises SOC calibration, SOH calibration and SOC equalization.

5. The method of calibration of claim 4, wherein, The second priority sequence is determined according to calibration accuracy and / or calibration period of the plurality of battery clusters.

6. The calibration method according to any one of claims 1 to 3, characterized in that, The method comprises: obtaining second SOC values of the plurality of battery clusters; controlling the plurality of battery clusters to perform SOC inter-cluster balancing according to the second SOC values.

7. A method of calibrating an energy storage system, the method comprising: The energy storage system comprises a plurality of battery clusters; The calibration method comprises: sending a demand power; receiving charging and discharging powers of the plurality of battery clusters, the charging and discharging powers being determined according to the demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; sending a power distribution instruction according to the charging and discharging powers.

8. An energy storage system characterized by, The method comprises: a plurality of battery clusters, the plurality of battery clusters comprising a first battery cluster; a first controller configured to obtain a demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; the first controller is further configured to determine charging and discharging powers of the plurality of battery clusters according to the demand power and the first priority sequence; the first controller is further configured to control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging powers, the SOC calibration comprising SOC low-end static calibration and SOC full-charge calibration; the first controller is further configured to control the first battery cluster to perform SOC calibration if the charging and discharging power of the first battery cluster is lower than a power threshold, comprising: the first controller is further configured to obtain an SOC difference value between a plurality of battery cells of the first battery cluster; the first controller is further configured to control the first battery cluster to perform the SOC low-end static calibration if the first SOC value is greater than a first threshold and the SOC difference value is greater than a second threshold; the first controller is further configured to control the first battery cluster to perform the SOC low-end static calibration or the SOC full-charge calibration if the first SOC value is greater than the first threshold and the SOC difference value is less than or equal to the second threshold.

9. An energy storage system characterized by, The method comprises: a plurality of battery clusters; a second controller configured to send a demand power; the second controller is further configured to receive charging and discharging powers of the plurality of battery clusters, the charging and discharging powers being determined according to the demand power and a first priority sequence of the plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; the second controller is further configured to send a power distribution instruction according to the charging and discharging powers.

10. A calibration device for an energy storage system, characterized by The energy storage system comprises a plurality of battery clusters, the plurality of battery clusters comprising a first battery cluster; The calibration device comprises an obtaining unit and a determining unit, The acquisition unit is configured to acquire a demand power and a first priority sequence of a plurality of battery clusters, the first priority sequence being determined according to a plurality of first SOC values, each of the plurality of first SOC values corresponding to one of the plurality of battery clusters; The determination unit is configured to determine charging and discharging powers of the plurality of battery clusters according to the demand power and the first priority sequence; The determination unit is further configured to control the plurality of battery clusters to perform SOC and / or SOH calibration according to the charging and discharging powers, the SOC calibration including SOC low-end static calibration and SOC full-charge calibration; The determination unit is further configured to control the first battery cluster to perform SOC calibration in a case where the charging and discharging power of the first battery cluster is lower than a power threshold value, including: The determination unit is further configured to acquire an SOC difference value between a plurality of battery cells of the first battery cluster; The determination unit is further configured to control the first battery cluster to perform the SOC low-end static calibration in a case where the first SOC value is greater than a first threshold value and the SOC difference value is greater than a second threshold value; The determination unit is further configured to control the first battery cluster to perform the SOC low-end static calibration or the SOC full-charge calibration in a case where the first SOC value is greater than the first threshold value and the SOC difference value is less than or equal to the second threshold value.

11. A chip, characterized by The chip includes: A processor configured to call and run a computer program from a memory, so that a device installed with the chip performs a calibration method as claimed in any one of claims 1 to 6.

12. A computer program product, characterised in that, The chip includes: Computer program instructions configured to cause a computer to implement a calibration method as claimed in any one of claims 1 to 6 when the computer program instructions are executed by the computer.

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