An energy storage system and its state of charge calibration method and device

Abstract

The present invention discloses an energy storage system and a method and device for calibrating the state of charge thereof. The method for calibrating the state of charge of the energy storage system includes: in response to a preset control instruction, obtaining the initial state of charge of each of the energy storage batteries; determining a target energy storage battery according to the initial state of charge of the energy storage battery; controlling at least one of the energy storage batteries to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery to generate target state of charge data of the target energy storage battery; and calibrating the state of charge of the target energy storage battery according to the target state of charge data. The solution proposed by the present invention can perform static calibration of the state of charge, reduce the impact of the state of charge calibration of the energy storage system on power grid scheduling, and improve the user experience.

Description

Technical Field

[0001] Embodiments of the present invention relate to energy storage battery technology, and in particular, to an energy storage system, a method and a device for calibrating the state of charge thereof. Background Art

[0002] In recent years, with the rapid development of technology, the installed capacity of energy storage systems has been increasing continuously, and the management of battery energy storage systems has received more attention accordingly. Various battery parameters, such as the state of charge (SOC), are crucial for the management of energy storage systems.

[0003] The SOC is used to represent the percentage of the remaining power in the battery and is an important indicator of the battery state and performance. If the calibration of the SOC is not performed for a certain period of time, the error of the SOC may increase with the accumulation over a long time, affecting the battery measurement and further affecting the scheduling of the energy storage system.

[0004] The energy storage system is scheduled by the power grid and needs to meet the maximum benefit of customers. The traditional SOC calibration method cannot meet the requirements of power grid scheduling and load power consumption, affecting the user experience. Summary of the Invention

[0005] The present invention provides an energy storage system, a method and a device for calibrating the state of charge thereof, so as to realize the static calibration of the state of charge, reduce the influence of the state of charge calibration of the energy storage system on the power grid scheduling, and improve the user experience.

[0006] In a first aspect, an embodiment of the present invention provides a method for calibrating the state of charge of an energy storage system, where the method for calibrating the state of charge includes:

[0007] In response to a preset control instruction, obtaining the initial state of charge of each energy storage battery;

[0008] Determining a target energy storage battery according to the initial state of charge of the energy storage battery;

[0009] According to the initial state of charge of the target energy storage battery, controlling at least one energy storage battery to perform energy regulation on the target energy storage battery to generate target state of charge data of the target energy storage battery;

[0010] Calibrating the state of charge of the target energy storage battery according to the target state of charge data.

[0011] Optionally, the determining a target energy storage battery according to the initial state of charge of the energy storage battery includes:

[0012] Comparing the initial state of charge with a preset threshold according to the initial state of charge of the energy storage battery to generate a comparison result;

[0013] Determine the target energy storage battery according to the comparison result.

[0014] Optionally, comparing the initial state of charge of the energy storage battery with a preset threshold to generate a comparison result includes:

[0015] Taking the difference between the initial state of charge of the energy storage battery and a first preset value to generate a first comparison result according to the initial state of charge of the energy storage battery;

[0016] Taking the difference between the initial state of charge of the energy storage battery and a second preset value to generate a second comparison result according to the initial state of charge of the energy storage battery;

[0017] Wherein, the preset threshold includes a first preset value and a second preset value; the first preset value is less than the second preset value.

[0018] Optionally, determining the target energy storage battery according to the comparison result includes:

[0019] When the initial state of charge of the energy storage battery is less than or equal to the first preset value, determining the energy storage battery as the first target energy storage battery; and / or,

[0020] When the initial state of charge of the energy storage battery is greater than or equal to the second preset value, determining the energy storage battery as the second target energy storage battery;

[0021] Wherein, the target energy storage battery includes the first target energy storage battery and / or the second target energy storage battery.

[0022] Optionally, controlling at least one of the energy storage batteries to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery to generate target state of charge data of the target energy storage battery includes:

[0023] Controlling the energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery;

[0024] Obtaining the state data of the target energy storage battery after energy regulation;

[0025] Comparing the state data with target state data to generate a comparison result;

[0026] Generating target state of charge data of the target energy storage battery according to the comparison result.

[0027] Optionally, controlling the energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery includes:

[0028] Control the energy regulation between the first target energy storage battery and the second target energy storage battery according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery; and / or,

[0029] Control the standby energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery;

[0030] Wherein, the standby energy storage battery is the energy storage battery whose initial state of charge is between the first preset value and the second preset value.

[0031] Optionally, the controlling the energy regulation between the first target energy storage battery and the second target energy storage battery according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery includes:

[0032] Control the first target energy storage battery to charge the second target energy storage battery according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery.

[0033] Optionally, the controlling the standby energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery includes:

[0034] Control the standby energy storage battery to charge the second target energy storage battery according to the initial state of charge of the target energy storage battery; and / or,

[0035] Control the first target energy storage battery to discharge to the standby energy storage battery according to the initial state of charge of the target energy storage battery.

[0036] Optionally, the obtaining the state data of the target energy storage battery after energy regulation includes:

[0037] Obtain the first state data of the first target energy storage battery and / or the second state data of the second target energy storage battery.

[0038] Optionally, the comparing the state data with the target state data to generate a comparison result includes:

[0039] Compare the first state data with the first target state data to generate a first comparison result; and / or,

[0040] Compare the second state data with the second target state of charge data to generate a second comparison result;

[0041] Wherein, the target state data includes the first target state data and the second target state data.

[0042] Optionally, generating the target state of charge data of the target energy storage battery according to the comparison result includes:

[0043] When the first comparison result includes that the first state data is equal to the first target state data, generating the first target state of charge data of the target energy storage battery; and / or,

[0044] When the second comparison result includes that the second state data is equal to the second target state data, generating the second target state of charge data of the target energy storage battery.

[0045] Optionally, calibrating the state of charge of the target energy storage battery according to the target state of charge data includes:

[0046] Calibrating the state of charge of the first target energy storage battery to the first target state of charge data to generate first calibration process data;

[0047] And / or, calibrating the state of charge of the second target energy storage battery to the second target state of charge data to generate second calibration process data.

[0048] Optionally, before calibrating the state of charge of the target energy storage battery according to the target state of charge data, it further includes:

[0049] Letting the target energy storage battery stand for a first preset period.

[0050] Optionally, before obtaining the initial state of charge of each energy storage battery in response to a preset control instruction, it further includes:

[0051] When it is detected that the time interval since the previous charge calibration exceeds a second preset period, or when a calibration instruction is received, generating a preset control instruction.

[0052] Optionally, after calibrating the state of charge of the target energy storage battery according to the target state of charge data, it further includes:

[0053] Restoring the state of charge of the energy storage battery to the initial state of charge;

[0054] Storing the first calibration process data and / or the second calibration process data of the energy storage battery.

[0055] Second aspect, an embodiment of the present invention further provides a state-of-charge calibration device for an energy storage system. The state-of-charge calibration device for the energy storage system includes: a data acquisition module, a comparison and determination module, an energy regulation module, and a calibration module. The data acquisition module is configured to obtain the initial state of charge of each of the energy storage batteries in response to a preset control instruction; the comparison and determination module is configured to determine a target energy storage battery according to the initial state of charge of the energy storage battery; the energy regulation module is configured to control at least one of the energy storage batteries to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery to generate target state-of-charge data of the target energy storage battery; the calibration module is configured to calibrate the state of charge of the target energy storage battery according to the target state-of-charge data.

[0056] Third aspect, an embodiment of the present invention further provides an energy storage system. The energy storage system includes: the state-of-charge calibration device for the energy storage system described in the second aspect, and at least two energy storage batteries, a DC conversion circuit corresponding to each energy storage battery one by one, a DC bus, and an inverter circuit; the state-of-charge calibration device for the energy storage system is configured to execute the state-of-charge calibration method for the energy storage system described in any item of the first aspect; the DC conversion circuit is connected to the state-of-charge calibration device, and the switch and function switching of the DC conversion circuit are controlled by the state-of-charge calibration device.

[0057] The energy storage system, its state-of-charge calibration method and device provided by the embodiments of the present invention determine a target energy storage battery according to the initial state of charge of each energy storage battery, and then control at least one energy storage battery in the energy storage system to perform energy regulation on the target energy storage battery according to the state of charge of the target energy storage battery, so that the target energy storage battery generates target state-of-charge data, and then calibrate the state of charge of the target energy storage battery according to the target state-of-charge data, realizing static calibration of the state of charge of the energy storage system. During the state-of-charge calibration process, a part of the energy storage batteries are determined as target energy storage batteries, reducing the number of energy storage batteries calibrated simultaneously, which can reduce the amount of data processing and improve the calibration efficiency. And by using the energy storage batteries in the energy storage system to realize energy regulation of the target energy storage battery, it avoids the energy exchange between the energy storage system and external devices during state-of-charge calibration. The state-of-charge calibration method for the energy storage system provided in this embodiment can keep the total power in the energy storage system unchanged, realize static calibration of the state of charge in the energy storage system, ensure that the total power of the energy storage system remains constant before and after state-of-charge calibration, reduce the impact of the state-of-charge calibration of the energy storage system on power grid scheduling, and improve the user experience. Description of the Drawings

[0058] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0059] Figure 1 It is a schematic flowchart of a method for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention;

[0060] Figure 2 It is a schematic flowchart of another method for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention;

[0061] Figure 3 It is a schematic flowchart of an energy regulation method provided by an embodiment of the present invention;

[0062] Figure 4 It is a schematic flowchart of yet another method for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention;

[0063] Figure 5 It is a schematic flowchart of yet another method for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention;

[0064] Figure 6 It is a schematic flowchart of yet another method for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention;

[0065] Figure 7 It is a flowchart of a recovery processing procedure provided by an embodiment of the present invention;

[0066] Figure 8 It is a flowchart of yet another method for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention;

[0067] Figure 9 It is a schematic structural diagram of a device for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention;

[0068] Figure 10 It is a schematic structural diagram of an energy storage system provided by an embodiment of the present invention. Detailed implementation manners

[0069] To enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0071] As mentioned in the background art, the existing charge calibration method of the energy storage system has a great impact on power grid dispatching and load power consumption, and it is easy to lead to poor customer experience. After research by the inventors, the reasons for this problem are as follows: The energy storage system includes at least two energy storage batteries. When using the existing charge calibration method of the energy storage system to calibrate the charge of the energy storage system, an external device is used to charge or discharge each energy storage battery in the energy storage system to make each energy storage battery reach a fully charged or fully discharged state, and then further charge calibration is carried out. However, the energy storage system is subject to the dispatching of the power grid, and the stored energy is controlled by the power grid and needs to participate in the power grid operation and / or provide power supply services for the load. The traditional calibration method causes an energy deviation between the energy storage system before and after calibration, and cannot quickly be put into power grid dispatching and power supply services, thus affecting the user experience.

[0072] To solve the above problems, an embodiment of the present invention provides a charge calibration method for an energy storage system. This charge calibration method can be implemented by a state-of-charge calibration device of the energy storage system, and this state-of-charge calibration device can be integrated into the controller. Figure 1 It is a schematic flowchart of a charge calibration method for an energy storage system provided by an embodiment of the present invention. Refer to Figure 1 , the charge calibration method of the energy storage system includes:

[0073] S101, in response to a preset control instruction, obtain the initial state of charge of each energy storage battery.

[0074] Among them, the preset control instruction refers to an instruction that can trigger the charge calibration operation of the energy storage system. The initial state of charge refers to the state of charge of each energy storage battery before energy adjustment of each energy storage battery.

[0075] Specifically, it is determined whether a preset control instruction is detected. Exemplarily, the preset control instruction can be a start signal input by the user or a start instruction determined according to the operation data of the energy storage system. If the preset control instruction is detected, it indicates that the state of charge of the energy storage system needs to be calibrated.

[0076] After the preset control instruction is detected, the charging and discharging processes of each energy storage battery in the energy storage system can be paused, and after the states of each energy storage battery are stable, the real-time state of charge of each energy storage battery in the energy storage system is obtained as the initial state of charge of the energy storage battery. Exemplarily, the method of obtaining the initial state of charge of each energy storage battery can be to read from the battery management unit corresponding to each energy storage battery, or can be calculated by obtaining the cumulative charge and discharge power of the energy storage battery, which is not limited here.

[0077] S102. Determine the target energy storage battery according to the initial state of charge of the energy storage battery.

[0078] Among them, the target energy storage battery refers to the energy storage battery selected for energy regulation.

[0079] Specifically, the energy storage system includes multiple energy storage batteries, and during charge calibration, operations can be performed batch by batch. Therefore, it is necessary to determine the target energy storage battery for charge calibration in the energy storage system. The number of target energy storage batteries can be set to be less than the total number of energy storage batteries in the energy storage system. According to the initial state of charge of each energy storage battery in the energy storage system, the target energy storage battery for charge state calibration can be determined. Exemplarily, each energy storage battery can be grouped according to the initial state of charge of each energy storage battery in the energy storage system, and one or more of the groups can be used as the target energy storage battery for charge calibration. The energy storage batteries with the state of charge within a preset range in the energy storage system can also be used as the target energy storage battery for charge calibration. There is no limitation on the method of determining the target energy storage battery here.

[0080] S103. Control at least one energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery, and generate target state of charge data of the target energy storage battery.

[0081] Among them, energy regulation refers to the operation of charging the target energy storage battery or absorbing the discharge of the target energy storage battery using the power of other energy storage batteries in the energy storage system. The target state of charge data refers to the state of charge data corresponding to the target state that the target energy storage battery needs to reach through energy regulation.

[0082] Specifically, the target state reached by the target energy storage battery can be a voltage state, a state of charge, or other states related to the remaining charge of the energy storage battery. Exemplarily, the target state reached by the target energy storage battery can be the voltage state corresponding to when the target energy storage battery reaches a fully charged or fully discharged state. Based on the initial state of charge of the target energy storage battery, the relative relationship between the current state and the target state of the target energy storage battery can be determined. Furthermore, based on the relative relationship between the current state and the target state of the target energy storage battery, any energy storage battery in the energy storage system can be selected to adjust the energy of the target battery. Exemplarily, when the charging state of the energy storage battery is close to a fully charged state, the energy storage battery in this nearly fully charged state can be defined as the target energy storage battery. Other energy storage batteries in the energy storage system can be used to charge the nearly fully charged energy storage battery until the nearly fully charged energy storage battery reaches a fully charged state, and the target state of charge data of the target energy storage battery, that is, 100%, is generated. When the charging state of the energy storage battery is close to a depleted state, the energy storage battery in this nearly depleted state can be defined as the target energy storage battery. The nearly depleted energy storage battery can be used to discharge other energy storage batteries in the energy storage system until the nearly depleted energy storage battery reaches a fully discharged state, and the target state of charge data of the target energy storage battery, that is, 0%, is generated. It should be noted that the target state of charge of the target energy storage battery can include 100%, 99.9%, or 99.99%, etc., or 0%, 0.1%, or 0.01%, etc., which can be set according to the performance of the energy storage battery and are not limited herein.

[0083] It should be noted that when multiple target energy storage batteries are included in the energy storage system simultaneously, charging or discharging can be performed between the target energy storage batteries, or one or more energy storage batteries other than the target energy storage batteries can charge or discharge a single or multiple target batteries, which is not limited herein.

[0084] S104. Calibrate the state of charge of the target energy storage battery according to the target state of charge data.

[0085] Among them, calibration means setting a standard value for the current state of charge of the target energy storage battery, so that the energy storage battery can calculate the state of charge based on this standard value during the subsequent charging and discharging processes.

[0086] Specifically, according to the target state of charge data generated by the target energy storage battery, the corresponding state of charge is determined for the target energy storage battery. Exemplarily, if the target energy storage battery reaches the full charge state, the target state of charge data corresponding to the full charge state can be set to 100%, and then the target energy storage battery can be calibrated, and the state of charge at this time is 100%. If the target energy storage battery reaches the full discharge state, the target state of charge data corresponding to the full discharge state can be set to 0%, and then the target energy storage battery can be calibrated, and the state of charge at this time is 0%. It should be noted that after the calibration of the target energy storage battery is completed, the charge calibration can continue to be implemented on the remaining uncalibrated energy storage batteries in the energy storage system according to the foregoing method until the calibration of all energy storage batteries is completed.

[0087] The charge calibration method of the energy storage system provided in this embodiment determines the target energy storage battery according to the initial state of charge of each energy storage battery, and then, according to the state of charge of the target energy storage battery, controls at least one energy storage battery in the energy storage system to perform energy regulation on the target energy storage battery, so that the target energy storage battery generates target state of charge data, and then calibrates the state of charge of the target energy storage battery according to the target state of charge data, realizing the static calibration of the state of charge of each energy storage battery in the energy storage system. During the process of state of charge calibration, a part of the energy storage batteries are determined as target energy storage batteries, reducing the number of energy storage batteries calibrated simultaneously, which can reduce the data processing volume and improve the calibration efficiency. And by using the energy storage batteries in the energy storage system to realize the energy regulation of the target energy storage battery, the energy exchange between the energy storage system and external equipment during the state of charge calibration is avoided. The charge calibration method of the energy storage system provided in this embodiment can keep the total power in the energy storage system unchanged, realize the static calibration of the state of charge in the energy storage system, ensure that the total power of the energy storage system is constant before and after charge calibration, reduce the impact of the charge calibration of the energy storage system on power grid dispatching, and improve the user experience.

[0088] Optionally, Figure 2 is a schematic flowchart of another charge calibration method of the energy storage system provided by an embodiment of the present invention. Referring to Figure 2 , on the basis of the foregoing embodiment, the charge calibration method of the energy storage system includes:

[0089] S201. In response to a preset control instruction, obtain the initial state of charge of each energy storage battery.

[0090] Specifically, the content of step S201 corresponds to that of the foregoing step S101 and will not be elaborated here.

[0091] S202. Compare the initial state of charge with a preset threshold according to the initial state of charge of the energy storage battery to generate a comparison result.

[0092] Among them, the preset threshold refers to the state of charge set value for judging whether the energy storage battery meets the preset calibration requirements.

[0093] Specifically, compare the initial state of charge of each energy storage battery with the preset threshold to generate a comparison result between the initial state of charge of the energy storage battery and the preset threshold. The comparison result can reflect whether the energy storage battery meets the preset calibration requirements. The energy storage battery that meets the preset calibration requirements can be used as the target energy storage battery for charge calibration, and the energy storage battery that does not meet the preset calibration requirements can be calibrated for the state of charge according to the real-time state of charge after this calibration is completed, so as to realize the batch calibration of the energy storage system. Exemplarily, the comparison result can be the relative relationship between the initial state of charge and the preset threshold, or the difference between the initial state of charge and the preset threshold.

[0094] Exemplarily, the preset threshold can include a first preset value and a second preset value, and the first preset value is less than the second preset value. Thus, step S202 can be implemented from two aspects. First, according to the initial state of charge of the energy storage battery, subtract the initial state of charge from the first preset value to generate a first comparison result. Subtract the initial state of charge from the first preset value, and then compare the relative relationship between the initial state of charge of the energy storage battery and the first preset value according to the difference to generate a first comparison result. The first comparison result can reflect whether the energy storage battery is likely to reach the target state. Since the state of charge calibration needs to be implemented when the energy storage battery reaches the target state, it is necessary to adjust the energy to make the energy storage battery reach the target state.

[0095] Preferably, the target state can include the voltage state corresponding to full discharge. The first preset value can be 20%. If the first comparison result of an energy storage battery is that the initial state of charge is less than or equal to 20%, it indicates that the difference in the amount of electricity between the current state of this energy storage battery and the full discharge state is small, and it is easier to make the energy storage battery reach full discharge through energy adjustment compared to the energy storage battery with an initial state of charge greater than 20%.

[0096] Second, according to the initial state of charge of the energy storage battery, the difference between the initial state of charge and the second preset value can be calculated to generate a second comparison result. By subtracting the initial state of charge from the second preset value, the relative relationship and / or difference between the initial state of charge of the energy storage battery and the second preset value can be determined, and a second comparison result can be generated. The second comparison result can reflect whether the energy storage battery can easily reach the target state. Since the calibration of the state of charge can only be implemented when the energy storage battery reaches the target state, it is necessary to adjust the energy to make the energy storage battery reach the target state. Preferably, the target state can also include the voltage state corresponding to full charge. The second preset value can be 80%. If the second comparison result of an energy storage battery is that the initial state of charge is greater than or equal to 80%, it indicates that the difference in the amount of electricity between the current state of the energy storage battery and the fully discharged state is small, and it is easier to reach the fully discharged state through energy adjustment compared to an energy storage battery with an initial state of charge less than 80%.

[0097] S203. Determine the target energy storage battery according to the comparison result.

[0098] Specifically, according to the comparison result between the initial state of charge of the energy storage battery and the preset threshold, the energy storage battery whose comparison result meets the preset condition is determined as the target energy storage battery for calibration this time. The comparison result meeting the preset condition can reflect that the current state of the energy storage battery is relatively close to generating the target state data and is easier to reach the target state through energy adjustment. Exemplarily, the energy storage battery with an initial state of charge higher than the preset threshold can be determined as the target energy storage battery, or the energy storage battery with an initial state of charge 5% higher than the preset threshold can be used as the target energy storage battery, and no specific limitation is made here.

[0099] Exemplarily, the target energy storage battery can include a first target energy storage battery and / or a second target energy storage battery. When the initial state of charge of the energy storage battery is less than or equal to the first preset value, the energy storage battery can be determined as the first target energy storage battery. When the initial state of charge of the energy storage battery is greater than or equal to the second preset value, the energy storage battery is determined as the second target energy storage battery.

[0100] On the one hand, compared with the energy storage battery with an initial state of charge greater than the first preset value, the first target energy storage battery is easier to reach the target state through discharging. Therefore, when the initial state of charge of the energy storage battery is less than or equal to the first preset value, the energy storage battery can be determined as the first target energy storage battery. For example, the first preset value can be 20%. If the initial state of charge of the energy storage battery is less than or equal to 20%, then compared with the energy storage battery with an initial state of charge greater than 20%, this energy storage battery is easier to reach the fully discharged state through energy adjustment, and this energy storage battery can be determined as the first target energy storage battery.

[0101] On the other hand, compared with an energy storage battery whose initial state of charge is less than a second preset value, the second target energy storage battery is more likely to reach the target state through charging. Therefore, when the initial state of charge of the energy storage battery is greater than or equal to the second preset value, it can be determined that the energy storage battery is the second target energy storage battery. For example, the second preset value can be 80%. If the initial state of charge of the energy storage battery is greater than or equal to 80%, then compared with an energy storage battery whose initial state of charge is less than 80%, this energy storage battery is more likely to reach the full charge state through energy regulation, and this energy storage battery can be determined as the second target energy storage battery.

[0102] S204. According to the initial state of charge of the target energy storage battery, control at least one energy storage battery to perform energy regulation on the target energy storage battery to generate target state data of the target energy storage battery.

[0103] S205. Calibrate the state of charge of the target energy storage battery according to the target state of charge data.

[0104] Steps S204 and S205 respectively correspond to the same content as the foregoing steps S103 and S104, and will not be elaborated here.

[0105] For the state of charge calibration method of the energy storage system provided in this embodiment, the difference is taken between the initial state of charge and the first preset value to generate a first comparison result. The difference can also be taken between the initial state of charge and the second preset value to generate a second comparison result. Furthermore, the first target energy storage battery and the second target energy storage battery are determined according to the first comparison result and the second comparison result. This way of determining the target battery realizes a more detailed determination of the target energy storage battery. By comparing the initial state of charge with the first preset value and the second preset value, the battery that is more likely to reach the target state data through energy regulation is determined as the target energy storage battery. First, the energy storage battery that is easy to reach the target state data is calibrated for the state of charge. The energy regulation of the target energy storage battery can cause fluctuations in the state of charge of other batteries except the target energy storage battery. Therefore, the target energy storage battery can be re-determined according to the state of charge in the next batch of state of charge calibrations, and then the state of charge of these target energy storage batteries is calibrated, which can make the energy regulation in the state of charge calibration more efficient, reduce unnecessary energy exchange in the energy regulation process, and improve the efficiency of calibration.

[0106] Optionally, Figure 3 is a schematic flowchart of an energy regulation method provided by an embodiment of the present invention. Referring to Figure 3 , this energy regulation method can be applied to any of the foregoing embodiments. The energy regulation method includes:

[0107] S301. According to the initial state of charge of the target energy storage battery, control the energy storage battery to perform energy regulation on the target energy storage battery.

[0108] Specifically, based on the initial state of charge of the target energy storage battery, it can be known how much electricity the target energy storage battery needs to discharge or charge to reach the corresponding target state. Furthermore, one or several energy storage batteries with appropriate electricity can be selected to adjust the energy of the target energy storage battery.

[0109] The target energy storage battery includes a first target energy storage battery and a second target energy storage battery. The initial state of charge of the first target energy storage battery is less than or equal to a first preset value, which is convenient for reaching the fully discharged state through the energy adjustment method of discharging. The initial state of charge of the second target energy storage battery is greater than or equal to a second preset value, which is convenient for reaching the fully charged state through the energy adjustment method of charging. The first target energy storage battery needs to discharge electricity during energy adjustment, while the second target energy storage battery needs to charge electricity during energy adjustment. Therefore, based on the initial state of charge of the first target energy storage battery and the initial state of charge of the second target battery, the energy adjustment between the first target energy storage battery and the second energy storage battery can be controlled to further reduce unnecessary energy exchange during the energy adjustment process. Exemplarily, based on the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery, the first target energy storage battery is controlled to charge the second target energy storage battery. According to the different initial states of charge, the number of first target energy storage batteries charging the same second target energy storage battery can be one or more.

[0110] In addition, a spare energy storage battery can also be used to adjust the energy of the target energy storage battery. Among them, the spare energy storage battery is an energy storage battery with an initial state of charge greater than the first preset value and less than the second preset value. Specifically, based on the initial state of charge of the target energy storage battery, the spare energy storage battery can be controlled to charge the second target energy storage battery. And / or, based on the initial state of charge of the target energy storage battery, the first target energy storage battery can be controlled to discharge to the spare energy storage battery.

[0111] Exemplarily, during the process of using the spare energy storage battery to adjust the energy of the first target energy storage battery, a spare energy storage battery with an electricity capacity higher than the remaining electricity of the first target energy storage battery can be selected. For example, the first target energy storage battery with an initial state of charge of 15% can choose to charge a spare battery with an initial state of charge less than 80% to make the first target battery reach the fully discharged state. Similarly, during the process of using the spare energy storage battery to adjust the energy of the second target energy storage battery, a spare energy storage battery with a remaining electricity higher than the required electricity of the second target energy storage battery can be selected. For example, a spare battery with an initial state of charge greater than 20% can be used to charge the second target energy storage battery with an initial state of charge of 85% to make the second target battery reach the fully charged state.

[0112] It should be specifically noted that the priority of using the backup energy storage battery to adjust the energy of the target energy storage battery is lower than the priority of using the energy exchange between the target energy storage batteries to adjust the energy. Exemplarily, when the energy exchange between the target energy storage batteries cannot make all the target energy storage batteries reach the corresponding target state, appropriate backup energy storage batteries can be selected to adjust the energy of the target energy storage batteries that have not reached the target state. By setting corresponding priority levels for the batteries that adjust the energy of the target energy storage batteries and preferentially using the target energy storage batteries to charge and discharge each other for energy adjustment, the energy adjustment of the first target energy storage battery and the second target energy storage battery is realized simultaneously. This can not only reduce unnecessary energy exchange during the energy adjustment process, but also improve the speed of energy adjustment, and further improve the efficiency of charge calibration.

[0113] S302. Obtain the state data of the target energy storage battery after energy adjustment.

[0114] Among them, the state data refers to the parameter data that can represent the remaining power of the target energy storage battery.

[0115] After the energy adjustment, it is necessary to determine that the target energy storage batteries have all reached the target state for charge calibration. Therefore, the state data of the target energy storage battery after energy adjustment is obtained at this time. Specifically, the state data includes the first state data and / or the second state data. The process of obtaining the state data of the target energy storage battery after energy adjustment may include obtaining the first state data of the first target energy storage battery and / or the second state data of the second target energy storage battery. Among them, both the first state data and the second state data may be voltage data, and the value of the voltage data is positively correlated with the remaining power of the energy storage battery currently.

[0116] Exemplarily, after the energy adjustment of the target energy storage battery, a voltage sampling device is used to collect the voltage values of the first target energy storage battery and the second target energy storage battery to determine that both the first target energy storage battery and the second target energy storage battery have reached the target state.

[0117] S303. Compare the state data with the target state data to generate a comparison result.

[0118] Among them, the target state data refers to the preset state data that the target energy storage battery needs to reach through energy adjustment.

[0119] After the energy of the target energy storage battery is adjusted, the status data of the target energy storage battery can be compared with the target status data to determine the comparison result. If the status data of the target energy storage battery is equal to the target status data, it can be determined that the target energy storage battery has reached the target status capable of performing state-of-charge calibration and no further energy adjustment is required. Otherwise, it means that the energy storage battery has not reached the status capable of performing state-of-charge calibration and further energy adjustment is required until the comparison result is equal.

[0120] Specifically, the status data includes first status data and second status data. Correspondingly, the target status data includes first target status data and second target status data. During the comparison process, the first status data can be compared with the first target status data to generate a first comparison result. The second status data is compared with the second target state-of-charge data to generate a second comparison result. Among them, the first target status data can be the voltage value of the energy storage battery in the fully discharged state, and the second target status data can be the voltage value of the energy storage battery in the fully charged state.

[0121] Exemplarily, if the rated voltage range for charging and discharging the energy storage battery is 2.7V - 3.6V, that is, when the energy storage battery discharges to 2.7V, it is determined that the energy storage battery is in the fully discharged state, and when the energy storage battery charges to 3.6V, it is determined that the energy storage battery is in the fully charged state. The first target status data corresponding to the first target energy storage battery can be 2.7V. After energy adjustment, if the voltage of the first target energy storage battery is equal to 2.7V, a comparison result of equality is generated. The second target status data corresponding to the second target energy storage battery can be 3.6V. After energy adjustment, if the voltage of the second target energy storage battery is equal to 3.6V, a comparison result of equality is generated.

[0122] S304. Generate the target state-of-charge data of the target energy storage battery according to the comparison result.

[0123] Among them, the target state-of-charge data refers to the state-of-charge data corresponding to the target state.

[0124] Specifically, if the status data of the target energy storage battery is equal to the target status data, that is, the status data of the target energy storage battery is equal to the target status data, it indicates that the target energy storage battery has reached the target status capable of calibration. The target state-of-charge data is the state-of-charge data of the energy storage battery in the target state, and the relationship between the target state of the energy storage battery and the target state-of-charge data can be obtained through experiments. Specifically, when the first comparison result includes the first status data being equal to the first target status data, the first target state-of-charge data of the target energy storage battery is generated. And / or, when the second comparison result includes the second status data being equal to the second target status data, the second target state-of-charge data of the target energy storage battery is generated.

[0125] Exemplarily, after energy regulation, if the voltage of the first target energy storage battery is equal to 2.7V and the first target energy storage battery is in a fully discharged state at this time, the first target state of charge data of 0% is generated. If the voltage of the second target energy storage battery is equal to 3.6V and the second target energy storage battery is in a fully charged state at this time, the second target state of charge data of 100% is generated.

[0126] The energy regulation method provided in this embodiment performs energy regulation according to the initial state of charge of the target energy storage battery. The energy used for regulation comes from within the energy storage system, realizing static energy regulation of the energy storage battery. Furthermore, according to the comparison result between the state data of the battery after energy regulation and the target state data, the target state of charge data is generated to calibrate the energy storage battery. The target state data can accurately reflect the power of the target energy storage battery, further improving the accuracy of state of charge calibration.

[0127] Optionally, Figure 4 is a schematic flowchart of another method for calibrating the state of charge of an energy storage system provided by an embodiment of the present invention. Referring to Figure 4 , on the basis of the foregoing embodiment, the method for calibrating the state of charge of the energy storage system includes:

[0128] S401. In response to a preset control instruction, obtain the initial state of charge of each energy storage battery.

[0129] S402. Compare the initial state of charge with a preset threshold according to the initial state of charge of the energy storage battery to generate a comparison result.

[0130] S403. Determine the target energy storage battery according to the comparison result.

[0131] S404. Control at least one energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery to generate the target state data of the target energy storage battery.

[0132] Among them, steps S401, S402, S403, and S404 respectively correspond to the contents of steps S201, S202, S203, and S204 in the foregoing embodiment, and will not be elaborated here.

[0133] S405. Leave the target energy storage battery static for a first preset period.

[0134] Specifically, the target energy storage battery being static for the first preset period means that the target energy storage battery is placed in a static state without charging or discharging for the first preset period. During the process of the target energy storage battery being static for the first preset period, no charging, discharging, or movement is performed on the target energy storage battery. The first preset period is the preset duration for static state, which can be set and adjusted according to the specific model and parameters of the energy storage battery. After energy regulation, the energy storage battery has a certain polarization phenomenon. Before calibration, it can be static for the second preset period to eliminate polarization, increase the wetting degree of the battery cells, and improve the accuracy of calibration. Exemplarily, the first preset period can be 1 hour, 1.5 hours, 2 hours, etc.

[0135] S406. Calibrate the state of charge of the target energy storage battery according to the target state of charge data.

[0136] Among them, the content of step S406 is the same as that of step S205 in the foregoing embodiment, and will not be elaborated here.

[0137] For the state of charge calibration method of the energy storage system provided in this embodiment, a static period is set before calibrating the target energy storage battery. The target energy storage battery is static for the first preset period before calibration, which can eliminate the polarization phenomenon of the energy storage battery and further improve the accuracy of the state of charge calibration.

[0138] Optionally, Figure 5 is a schematic flowchart of another state of charge calibration method for an energy storage system provided by an embodiment of the present invention. Referring to Figure 5 , on the basis of the foregoing embodiment, the state of charge calibration method of the energy storage system includes:

[0139] S500. When it is detected that the time interval from the previous state of charge calibration exceeds the second preset period, or when a calibration instruction is received, generate a preset control instruction.

[0140] Among them, the previous state of charge calibration refers to the operation of completing the state of charge calibration of all energy storage batteries in the energy storage system by the energy storage system for the previous time. The time interval refers to the period between the current time point and the time point when the state of charge calibration of all energy storage batteries in the energy storage system was completed for the previous time. The second preset period is the preset threshold corresponding to the time interval. The calibration instruction is a control instruction input by the user to control the start of the state of charge calibration process of the energy storage system.

[0141] Specifically, according to the current time and the calibration time in the calibration data, the time interval between the current time and the previous state of charge calibration can be determined, that is, the continuous operation duration of the energy storage system, and it is judged whether the time interval exceeds the second preset period. At the same time, it is detected in real time whether a calibration instruction is received.

[0142] Exemplarily, the second preset time period can be three months, two months, etc., without any limitation here. If it is detected that the time interval from the previous charge calibration exceeds three months or a calibration instruction is received, it indicates that the charge state calibration of the energy storage battery needs to be started at this time to generate a preset control instruction. Furthermore, the charging and discharging of each energy storage battery in the energy storage system can be paused, and after the states of each energy storage battery are stable, the real-time charge state of each energy storage battery in the energy storage system can be obtained as the initial charge state of the energy storage battery. The second preset time period can be greater than the first preset time period.

[0143] S501. In response to the preset control instruction, obtain the initial charge state of each energy storage battery.

[0144] S502. Compare the initial charge state with a preset threshold according to the initial charge state of the energy storage battery to generate a comparison result.

[0145] S503. Determine the target energy storage battery according to the comparison result.

[0146] S504. Control at least one energy storage battery to perform energy regulation on the target energy storage battery according to the initial charge state of the target energy storage battery to generate target state data of the target energy storage battery.

[0147] S505. Calibrate the charge state of the target energy storage battery according to the target charge state data.

[0148] Among them, steps S501, S502, S503, S504, and S505 respectively correspond to and are the same as the contents of steps S201, S202, S203, S204, and S205 in the foregoing embodiment, and will not be elaborated here.

[0149] The charge calibration method provided in this embodiment obtains the initial charge state of the energy storage battery after detecting that the time interval from the previous charge calibration exceeds the second preset time period or receiving a calibration instruction, realizes the regular charge state calibration of the energy storage system, and can start the charge state calibration according to the calibration instruction input by the user, can flexibly adjust the time of the charge state calibration, and start the calibration when the user determines that calibration is needed, further improving the user experience.

[0150] Optionally, Figure 6 is a schematic flowchart of another charge calibration method for an energy storage system provided by an embodiment of the present invention. Referring to Figure 6 , on the basis of the foregoing embodiment, the charge calibration method of the energy storage system includes:

[0151] S601. In response to the preset control instruction, obtain the initial charge state of each energy storage battery.

[0152] S602. Compare the initial state of charge of the energy storage battery with a preset threshold to generate a comparison result.

[0153] S603. Determine the target energy storage battery according to the comparison result.

[0154] S604. Control at least one energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery, and generate target state data of the target energy storage battery.

[0155] Steps S601, S602, S603, and S604 are respectively the same as steps S201, S202, S203, and S204 in corresponding content, and will not be elaborated here.

[0156] S605. Calibrate the state of charge of the first target energy storage battery to the first target state of charge data to generate first calibration process data.

[0157] Among them, the first calibration process data is the parameter change data and the corresponding time data during the charge calibration process of the first target energy storage battery.

[0158] Specifically, after the target energy storage battery undergoes energy regulation, the first target energy storage battery has reached the corresponding target state. At this time, calibrate the state of charge of the first target energy storage battery to the first target state of charge.

[0159] Exemplarily, after the first target energy storage battery undergoes discharge energy regulation, the voltage of the first target energy storage battery with an initial state of charge of 18% has dropped to 2.7V (for example, the charge and discharge range of the energy storage battery is 2.7V - 3.6V). The first target energy storage battery has reached the full discharge target state, and the generated first target state of charge is 0%. Then, at this time, the state of charge of the first target energy storage battery can be calibrated to 0%. During subsequent use, the state of charge calculation of the first target energy storage battery is based on 0%.

[0160] S606. Calibrate the state of charge of the second target energy storage battery to the second target state of charge data to generate second calibration process data.

[0161] Among them, the second calibration process data is the parameter change data and the corresponding time data during the charge calibration process of the second target energy storage battery.

[0162] Specifically, after the second target energy storage battery undergoes energy regulation and reaches the corresponding target state, the state of charge of the second target energy storage battery is calibrated as the second target state of charge. Exemplarily, after charging energy regulation, the voltage of the second target energy storage battery with an initial state of charge of 85% has risen to 3.6V (for example, the charge and discharge range of the energy storage battery is 2.7V - 3.6V), and the second target energy storage battery reaches the fully charged target state, and the generated second target state of charge is 100%. Then, the state of charge of the second target energy storage battery can be calibrated as 100% at this time. During subsequent use, the state of charge of the second target energy storage battery will be calculated based on 100%.

[0163] It should be particularly noted that after calibrating this batch of target energy storage batteries, the charge calibration of spare batteries whose real-time state of charge meets the preset threshold can also be performed according to the foregoing process. During this process, the energy regulation can be performed using the energy storage batteries that have been calibrated until the charge calibration of all energy storage batteries in the energy storage system is completed.

[0164] The charge calibration method of the energy storage system provided in this embodiment calibrates the state of charge of the first target energy storage battery as the first target state of charge and calibrates the state of charge of the second target energy storage battery as the second target state of charge after the energy regulation is completed, realizing the charge calibration of the energy storage battery. The energy storage battery in the fully charged or fully discharged state is calibrated, and the fully charged or fully discharged state is easier to accurately achieve through energy regulation, improving the accuracy of the charge calibration method.

[0165] Optionally, on the basis of the foregoing embodiment, after calibrating all energy storage batteries in the energy storage system, the charge calibration method of the energy storage system may further include a recovery processing flow. Figure 7 For the flowchart of a recovery processing flow provided by an embodiment of the present invention, refer to Figure 7 , the recovery processing flow includes:[[]]

[0166] S701. Restore the state of charge of the energy storage battery to the initial state of charge.

[0167] Specifically, since some energy storage batteries are still in the target state after calibration, exemplarily, the target state can be the fully charged or fully discharged state. Restoring the state of charge of all energy storage batteries in the energy storage system to the initial state of charge can restore the energy storage batteries that are still in the target state after calibration to the initial state, so that the energy storage system can quickly be put into the operation and regulation of the power grid, reducing the impact of the state of charge calibration on the normal operation of the power grid, and further improving the customer experience.

[0168] S702. Store the first calibration process data and / or the second calibration process data of the energy storage battery.

[0169] Among them, the process data refers to the parameter change amount and the corresponding time data of the target energy storage battery during the state of charge calibration process. The first calibration process data refers to the parameter change parameters and the corresponding time data of the first target energy storage battery during the state of charge calibration process. The second calibration process data refers to the parameter change parameters and the corresponding time data of the second target energy storage battery during the state of charge calibration process

[0170] Specifically, the process data may include the calibration start time, the calibration completion time, the time when each batch of target energy storage batteries completes energy regulation, and / or any data related to the calibration process. Exemplarily, after calibrating all the energy storage batteries in the energy storage system, the calibration completion time can be stored, so that the time to start the next state of charge calibration can be determined according to the calibration completion time

[0171] The state of charge calibration method for the energy storage system provided in this embodiment further includes a recovery processing flow. After calibrating all the energy storage batteries in the energy storage system, the recovery processing flow can restore the energy storage batteries to the initial state of charge and store the first calibration process data and the second calibration process data of the state of charge calibration. Restoring the energy storage batteries that are still in the target state after calibration to the initial state of charge, so that the energy storage system can quickly be put into the operation and regulation of the power grid, reducing the impact of the state of charge calibration on the normal operation of the power grid, and can further improve the customer experience. The first calibration process data and the second calibration process data include the calibration completion time, and the time to start the next state of charge calibration can be determined according to the calibration completion time, improving the reliability of the state of charge calibration method for the energy storage system

[0172] Optionally, Figure 8 is a flowchart of another state of charge calibration method for the energy storage system provided in an embodiment of the present invention. Referring to Figure 8 , on the basis of the foregoing embodiment, the state of charge calibration method for the energy storage system includes:

[0173] S801. After detecting that the time interval from the previous state of charge calibration exceeds a second preset period or receiving a calibration instruction, obtain the initial state of charge of the energy storage battery

[0174] Specifically, according to the current time and the calibration time in the calibration data, the time interval between the current time and the previous charge calibration can be determined, that is, the continuous operation duration of the energy storage system, and then it is determined whether the time interval exceeds the second preset period. At the same time, it is detected in real time whether a calibration instruction is received. Exemplarily, the second preset period can be three months. If it is detected that the time interval from the previous charge calibration exceeds three months or a calibration instruction is received, it indicates that the state of charge calibration of the energy storage battery needs to be started at this time. Then, the charging and discharging of each energy storage battery in the energy storage system are paused, and after the state of charge of each energy storage battery is stable, the real-time state of charge of each energy storage battery in the energy storage system is obtained as the initial state of charge of the energy storage battery.

[0175] S802. Compare the initial state of charge of the energy storage battery with a preset threshold to generate a comparison result.

[0176] Specifically, the initial state of charge of each energy storage battery is compared with a preset threshold to generate a comparison result between the initial state of charge of the energy storage battery and the preset threshold. The comparison result can reflect whether the energy storage battery meets the preset calibration requirements. The energy storage battery that meets the preset calibration requirements can be used as the target energy storage battery for this calibration, and the energy storage battery that does not meet the preset calibration requirements can be calibrated according to the real-time state of charge after this batch of calibrations is completed, so as to realize the batch-by-batch calibration of each energy storage battery in the energy storage system. Exemplarily, the comparison result can be the relative relationship between the initial state of charge and the preset threshold, or the difference between the initial state of charge and the preset threshold.

[0177] Exemplarily, the preset threshold can include a first preset value and a second preset value, and the first preset value is less than the second preset value. Thus, step S802 can be implemented from two aspects. Firstly, according to the initial state of charge of the energy storage battery, the difference between the initial state of charge and the first preset value is calculated to generate a first comparison result. The first comparison result can reflect whether the energy storage battery is easy to reach the target state. Since the state of charge calibration needs to be implemented when the energy storage battery reaches the target state, it is necessary to adjust the energy to make the energy storage battery reach the target state. Preferably, the target state can include the voltage state corresponding to full discharge. The first preset value can be 20%. If the first comparison result of an energy storage battery is that the initial state of charge is less than or equal to 20%, it indicates that the difference in the amount of electricity between the current state of the energy storage battery and the full discharge state is small, and it is easier to make the energy storage battery reach full discharge by means of energy adjustment compared with the energy storage battery with an initial state of charge greater than 20%.

[0178] Second, based on the initial state of charge of the energy storage battery, the difference between the initial state of charge and a second preset value can be calculated to generate a second comparison result. The second comparison result can reflect whether the energy storage battery can easily reach the target state. Since the state of charge calibration can only be performed when the energy storage battery reaches the target state, energy adjustment is required to make the energy storage battery reach the target state. Preferably, the target state may further include the voltage state corresponding to full charge. The second preset value can be 80%. If the second comparison result of an energy storage battery is that the initial state of charge is greater than or equal to 80%, it indicates that the difference in the amount of electricity between the current state of the energy storage battery and the fully discharged state is small, and it is easier to reach full discharge through energy adjustment compared to an energy storage battery with an initial state of charge less than 80%.

[0179] S803. Determine the target energy storage battery according to the comparison result.

[0180] Specifically, based on the comparison result between the initial state of charge of the energy storage battery and the preset threshold, the energy storage battery whose comparison result meets the preset condition is determined as the target energy storage battery for this calibration. The comparison result meeting the preset condition can reflect that the current state of the energy storage battery is relatively close to generating the target state data and it is easier to reach the target state through energy adjustment. Exemplarily, an energy storage battery with an initial state of charge higher than the preset threshold can be determined as the target energy storage battery, or an energy storage battery with an initial state of charge 5% higher than the preset threshold can be used as the target energy storage battery.

[0181] Exemplarily, the target energy storage battery may include a first target energy storage battery and / or a second target energy storage battery. When the initial state of charge of the energy storage battery is less than or equal to a first preset value, the energy storage battery can be determined as the first target energy storage battery. When the initial state of charge of the energy storage battery is greater than or equal to a second preset value, the energy storage battery is determined as the second target energy storage battery.

[0182] On the one hand, compared with an energy storage battery with an initial state of charge greater than the first preset value, the first target energy storage battery is easier to reach the target state through discharging. When the initial state of charge of the energy storage battery is less than or equal to the first preset value, the energy storage battery can be determined as the first target energy storage battery. For example, the first preset value can be 20%. If the initial state of charge of the energy storage battery is less than or equal to 20%, then compared with an energy storage battery with an initial state of charge greater than 20%, this energy storage battery is easier to reach the full discharge state through energy adjustment, and this energy storage battery can be determined as the first target energy storage battery.

[0183] On the other hand, compared with an energy storage battery whose initial state of charge is less than a second preset value, the second target energy storage battery is more likely to reach the target state through charging. When the initial state of charge of the energy storage battery is greater than or equal to the second preset value, the energy storage battery can be determined as the second target energy storage battery. For example, the second preset value can be 80%. If the initial state of charge of the energy storage battery is greater than or equal to 80%, then compared with an energy storage battery whose initial state of charge is less than 80%, this energy storage battery is more likely to reach the fully charged state through energy regulation, and this energy storage battery can be determined as the second target energy storage battery.

[0184] S804. Control the energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery.

[0185] Specifically, according to the initial state of charge of the target energy storage battery, it can be known how much electric energy the target energy storage battery needs to discharge or charge to reach the corresponding target state, and then one or more energy storage batteries with appropriate electric energy can be selected to perform energy regulation on the target energy storage battery.

[0186] The target energy storage battery includes a first target energy storage battery and a second target energy storage battery. The initial state of charge of the first target energy storage battery is less than or equal to a first preset value, which is convenient for reaching the fully discharged state through the energy regulation method of discharging. The initial state of charge of the second target energy storage battery is greater than or equal to the second preset value, and it is easy to reach the fully charged state through the energy regulation method of charging. The energy flow directions of the first target energy storage battery and the second target energy storage battery are opposite during energy regulation. Therefore, according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target battery, the energy regulation between the first target energy storage battery and the second energy storage battery can be controlled.

[0187] Exemplarily, according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery, control the first target energy storage battery to charge the second target energy storage battery. Among them, according to the difference in the initial state of charge, the number of first target energy storage batteries charging the same second target energy storage battery can be one or more.

[0188] On the other hand, a spare energy storage battery can also be used to perform energy regulation on the target energy storage battery, where the spare energy storage battery is an energy storage battery whose initial state of charge is between the first preset value and the second preset value. Specifically, according to the initial state of charge of the target energy storage battery, control the spare energy storage battery to charge the second target energy storage battery. And / or, according to the initial state of charge of the target energy storage battery, control the first target energy storage battery to discharge to the spare energy storage battery.

[0189] Exemplarily, in the process of using a backup energy storage battery to perform energy regulation on a first target energy storage battery, a backup energy storage battery with a charge capacity higher than the remaining charge of the first target energy storage battery can be selected. For example, a first target energy storage battery with an initial state of charge of 15% can select a backup battery with an initial state of charge less than 80% to charge, so that the first target battery reaches a fully discharged state.

[0190] Similarly, in the process of using a backup energy storage battery to perform energy regulation on a second target energy storage battery, a backup energy storage battery with a remaining charge higher than the required charge of the second target energy storage battery can be selected. For example, a backup battery with an initial state of charge greater than 20% can be used to charge a second target energy storage battery with an initial state of charge of 85%, so that the second target battery reaches a fully charged state.

[0191] S805. Obtain the status data of the target energy storage battery after energy regulation.

[0192] Among them, the status data refers to parameter data that can represent the remaining charge of the target energy storage battery.

[0193] Specifically, after energy regulation, it is necessary to determine whether the target energy storage battery has reached the target state for charge calibration. Therefore, the status data of the target energy storage battery after energy regulation is obtained at this time. Specifically, the status data includes first status data and / or second status data. The process of obtaining the status data of the target energy storage battery after energy regulation may include obtaining the first status data of the first target energy storage battery and / or the second status data of the second target energy storage battery. Among them, both the first status data and the second status data may be voltage data, and the voltage data is positively correlated with the current remaining charge of the battery. Exemplarily, after energy regulation, a voltage sampling device is used to collect the voltage values of the first target energy storage battery and the second target energy storage battery.

[0194] S806. Compare the status data with the target status data to generate a comparison result.

[0195] After completing the energy regulation, the status data of the target energy storage battery can be compared with the target status data, and the comparison result can be determined. If the status data of the target energy storage battery is equal to the target status data, it can be determined that the target energy storage battery has reached the target status capable of performing state of charge calibration and no further energy regulation is required. Otherwise, it means that the energy storage battery has not reached the state capable of performing state of charge calibration and further energy regulation is required until the comparison result is equal. Specifically, the target status data includes the first target status data and the second target status data. During the comparison process, the first status data can be compared with the first target status data to generate the first comparison result. The second status data is compared with the second target state of charge data to generate the second comparison result. Among them, the first target status data can be the voltage value of the energy storage battery in the full discharge state, and the second target status data can be the voltage value of the energy storage battery in the full charge state.

[0196] Exemplarily, if the rated voltage range for charging and discharging of the energy storage battery is 2.7V - 3.6V, that is, when the energy storage battery discharges to 2.7V, it is determined that the energy storage battery is in the full discharge state, and when the energy storage battery charges to 3.6V, it is determined that the energy storage battery is in the full charge state. The first target status data corresponding to the first target energy storage battery can be 2.7V. After energy regulation, if the voltage of the first target energy storage battery is equal to 2.7V, the comparison result is generated as equal. The second target status data corresponding to the second target energy storage battery can be 3.6V. After energy regulation, if the voltage of the second target energy storage battery is equal to 3.6V, the comparison result is generated as equal.

[0197] S807. Generate the target state of charge data of the target energy storage battery according to the comparison result.

[0198] If the status data of the target energy storage battery is equal to the target status data, that is, the status data of the target energy storage battery is equal to the target status data, it indicates that the target energy storage battery has reached the target status capable of calibration. The target state of charge data is the state of charge data corresponding to the target status, and the relationship between the target status of the energy storage battery and the target state of charge data can be obtained through experiments. Specifically, when the first comparison result includes that the first status data is equal to the first target status data, the first target state of charge data of the target energy storage battery is generated. And / or, when the second comparison result includes that the second status data is equal to the second target status data, the second target state of charge data of the target energy storage battery is generated.

[0199] Exemplarily, after completing the energy regulation of the target energy storage battery, if the first comparison result includes that the voltage of the first target energy storage battery is equal to 2.7V, and at this time the first target energy storage battery is in a fully discharged state, then the first target state of charge data of 0% is generated. If the second comparison result includes that the voltage of the second target energy storage battery is equal to 3.6V, and at this time the second target energy storage battery is in a fully charged state, then the second target state of charge data of 100% is generated.

[0200] S808. Leave the target energy storage battery static for a first preset period.

[0201] Specifically, static means the static placement operation, during which no charging, discharging or movement is performed on the target energy storage battery. The first preset period is the preset duration of static, which can be set according to the specific model and parameters of the energy storage battery. The energy storage battery has a certain polarization phenomenon after energy regulation. Before calibration, it can be left static for a second preset period to eliminate polarization and increase the wetting degree of the battery core, which can improve the accuracy of calibration. Exemplarily, the first preset period can be 1 hour, and in specific operations, the specific value of the first preset period can be set according to the parameters of the energy storage battery.

[0202] S809. Calibrate the state of charge of the first target energy storage battery to the first target state of charge data.

[0203] Specifically, after energy regulation, the first target energy storage battery has reached the corresponding target state. At this time, calibrate the state of charge of the first target energy storage battery to the first target state of charge. Exemplarily, after discharge energy regulation, the voltage of the first target energy storage battery with an initial state of charge of 18% has dropped to 2.7V (for example, the charge and discharge range of the energy storage battery is 2.7V - 3.6V), and the first target energy storage battery has reached the fully discharged target state, and the generated first target state of charge is 0%. Then at this time, the state of charge of the first target energy storage battery can be calibrated to 0%. In subsequent use, the state of charge of the first target energy storage battery is calculated based on 0%.

[0204] S810. Calibrate the state of charge of the second target energy storage battery to the second target state of charge data.

[0205] Specifically, after energy regulation, the second target energy storage battery has reached the corresponding target state. At this time, the state of charge of the second target energy storage battery is calibrated as the second target state of charge. Exemplarily, after charging energy regulation, the voltage of the second target energy storage battery with an initial state of charge of 85% has risen to 3.6V (for example, the charge and discharge range of the energy storage battery is 2.7V - 3.6V), and the second target energy storage battery has reached the fully charged target state. The generated second target state of charge is 100%. Then, the state of charge of the second target energy storage battery can be calibrated as 100% at this time. During subsequent use, the state of charge of the second target energy storage battery is calculated based on 100%.

[0206] S811. Restore the state of charge of the energy storage battery to the initial state of charge.

[0207] Specifically, since some energy storage batteries are still in the target state after calibration, exemplarily, the target state can be the fully charged or fully discharged state. Restoring the state of charge of all energy storage batteries in the energy storage system to the initial state of charge can restore the energy storage batteries still in the target state after calibration to the initial state, so that the power of the energy storage batteries in the energy storage system is restored to the level before charge calibration. Since the state data record of the energy storage system in the power grid is similar to the real-time state data of the energy storage system after calibration, the energy storage system can be quickly put into the operation and regulation of the power grid, reducing the impact of state-of-charge calibration on the normal operation of the power grid, and further improving the customer experience.

[0208] S812. Store the process data of state-of-charge calibration.

[0209] Specifically, the process data may include the first calibration process data, the second calibration process data, the calibration start time, the calibration completion time, the time when each batch of target energy storage batteries completes energy regulation, and / or any data related to the calibration process. Exemplarily, after completing the calibration of all energy storage batteries in the energy storage system, the calibration completion time can be stored, so that the time to start the next state-of-charge calibration can be determined according to the calibration completion time.

[0210] The charge calibration method of the energy storage system provided in this embodiment realizes the static calibration of the state of charge of the energy storage system. During the process of state of charge calibration, a part of the energy storage batteries are determined as target energy storage batteries, and the number of energy storage batteries calibrated simultaneously is reduced, which can reduce the amount of data processing and improve the calibration efficiency. By using the energy storage batteries in the energy storage system to realize the energy regulation of the target energy storage batteries, the energy exchange between the energy storage system and external devices during the state of charge calibration is avoided. The charge calibration method of the energy storage system provided in this embodiment can keep the total power in the energy storage system unchanged, realize the static calibration of the state of charge in the energy storage system, ensure that the total power of the energy storage system is constant before and after charge calibration, reduce the impact of the state of charge calibration of the energy storage system on power grid dispatching, and improve the user experience.

[0211] The embodiment of the present invention also provides a charge calibration device for an energy storage system. Figure 9 It is a structural schematic diagram of a charge calibration device for an energy storage system provided by an embodiment of the present invention. Referring to Figure 9 , the charge calibration device of the energy storage system includes: a data acquisition module 9**01**, a comparison and determination module 9**02**, an energy regulation module 9**03**, and a calibration module 9**04**; the data acquisition module 9**01** is configured to acquire the initial state of charge of each energy storage battery in response to a preset control instruction; the comparison and determination module 9**02** is configured to determine the target energy storage battery according to the initial state of charge of the energy storage battery; the energy regulation module 9**03** is configured to control at least one energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery to generate target state data of the target energy storage battery; the calibration module 9**04** is configured to calibrate the state of charge of the target energy storage battery according to the target state of charge data.

[0212] The charge calibration device of the energy storage system provided in this embodiment determines the target energy storage battery according to the initial state of charge of each energy storage battery, and then controls at least one energy storage battery in the energy storage system to perform energy regulation on the target energy storage battery according to the state of charge of the target energy storage battery, so that the target energy storage battery generates target state of charge data, and then calibrates the state of charge of the target energy storage battery according to the target state of charge data, realizing the static calibration of the state of charge of the energy storage system. During the process of state of charge calibration, a part of the energy storage batteries are determined as target energy storage batteries, and the number of energy storage batteries calibrated simultaneously is reduced, which can reduce the amount of data processing and improve the calibration efficiency. By using the energy storage batteries in the energy storage system to realize the energy regulation of the target energy storage batteries, the energy exchange between the energy storage system and external devices during the state of charge calibration is avoided. The charge calibration method of the energy storage system provided in this embodiment can keep the total power in the energy storage system unchanged, realize the static calibration of the state of charge in the energy storage system, ensure that the total power of the energy storage system is constant before and after charge calibration, reduce the impact of the state of charge calibration of the energy storage system on power grid dispatching, and improve the user experience.

[0213] Optionally, based on the foregoing embodiments, the comparison and determination module includes a comparison unit and a determination unit. The comparison unit is configured to compare the initial state of charge of the energy storage battery with a preset threshold according to the initial state of charge of the energy storage battery, and generate a comparison result. The determination unit is configured to determine the target energy storage battery according to the comparison result.

[0214] Optionally, based on the foregoing embodiments, the comparison unit includes a first comparison element and a second comparison element. The first comparison element is configured to subtract the initial state of charge from a first preset value according to the initial state of charge of the energy storage battery, and generate a first comparison result; the second comparison element is configured to subtract the initial state of charge from a second preset value according to the initial state of charge of the energy storage battery, and generate a second comparison result. Wherein, the preset threshold includes a first preset value and a second preset value; the first preset value is less than the second preset value.

[0215] Optionally, based on the foregoing embodiments, the determination unit includes a first determination element and / or a second determination element. The first determination element is configured to determine the energy storage battery as the first target energy storage battery when the initial state of charge of the energy storage battery is less than or equal to the first preset value; the second determination element is configured to determine the energy storage battery as the second target energy storage battery when the initial state of charge of the energy storage battery is greater than or equal to the second preset value; wherein, the target energy storage battery includes the first target energy storage battery and / or the second target energy storage battery.

[0216] Optionally, based on the foregoing embodiments, the energy regulation module includes an energy regulation unit, a state data acquisition unit, a comparison unit, and a target state of charge generation unit. The energy regulation unit is configured to control the energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery; the state data acquisition unit is configured to acquire the state data of the target energy storage battery after energy regulation; the comparison unit is configured to compare the state data with the target state data, and generate a comparison result; the target state of charge generation unit is configured to generate the target state of charge data of the target energy storage battery according to the comparison result.

[0217] Optionally, based on the foregoing embodiments, the energy regulation unit includes a first energy regulation element and / or a second energy regulation element. The first energy regulation element is configured to control energy regulation between the first target energy storage battery and the second target energy storage battery according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery; the second energy regulation element is configured to control the standby energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery. Wherein, the standby energy storage battery is an energy storage battery with an initial state of charge between the first preset value and the second preset value.

[0218] Optionally, based on the foregoing embodiments, the first energy regulation element includes a target charging assembly, and the target charging module is configured to control the first target energy storage battery to charge the second target energy storage battery according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery.

[0219] Optionally, based on the foregoing embodiments, the second energy regulation element includes a standby charging assembly and a standby discharging assembly. The standby charging assembly is configured to control a standby energy storage battery to charge the second target energy storage battery according to the initial state of charge of the target energy storage battery. The standby discharging assembly is configured to control the first target energy storage battery to discharge to the standby energy storage battery according to the initial state of charge of the target energy storage battery.

[0220] Optionally, based on the foregoing embodiments, the state data acquisition unit includes a first acquisition element and / or a second acquisition element. The first acquisition element is configured to acquire first state data of the first target energy storage battery; the second acquisition element is configured to acquire second state data of the second target energy storage battery.

[0221] Optionally, based on the foregoing embodiments, the comparison unit includes a first comparison element and / or a second comparison element. The first comparison element is configured to compare the first state data with first target state data to generate a first comparison result; the second comparison element is configured to compare the second state data with second target state of charge data to generate a second comparison result; wherein the target state data includes the first target state data and the second target state data.

[0222] Optionally, based on the foregoing embodiments, the target state of charge generation unit includes a first generation element and / or a second generation element. The first generation element is configured to generate first target state of charge data of the target energy storage battery when the first comparison result includes that the first state data is equal to the first target state data; the second generation element is configured to generate second target state of charge data of the target energy storage battery when the second comparison result includes that the second state data is equal to the second target state data.

[0223] Optionally, based on the foregoing embodiments, the calibration module includes a first calibration unit and / or a second calibration unit. The first calibration unit is configured to calibrate the state of charge of the first target energy storage battery to the first target state of charge data; the second calibration unit is configured to calibrate the state of charge of the second target energy storage battery to the second target state of charge data.

[0224] Optionally, based on the foregoing embodiments, the state-of-charge calibration device of the energy storage system further includes a static module, a state-of-charge recovery module, and a process data storage module. The static module is configured to staticize the target energy storage battery for a first preset period before calibrating the state of charge of the target energy storage battery. The state-of-charge recovery module is configured to restore the energy storage battery to its initial state of charge. The process data storage module is configured to store the process data of the state-of-charge calibration.

[0225] The state-of-charge calibration device of the energy storage system provided in this embodiment realizes the static calibration of the state of charge of the energy storage system. During the state-of-charge calibration process, a part of the energy storage batteries are determined as target energy storage batteries, and the number of energy storage batteries calibrated simultaneously is reduced, which can reduce the data processing volume and improve the calibration efficiency. By using the energy storage batteries in the energy storage system to realize the energy regulation of the target energy storage batteries, the energy exchange between the energy storage system and external devices during the state-of-charge calibration is avoided. The state-of-charge calibration method of the energy storage system provided in this embodiment can keep the total power in the energy storage system unchanged, realize the static calibration of the state of charge in the energy storage system, ensure that the total power of the energy storage system is constant before and after the state-of-charge calibration, reduce the impact of the state-of-charge calibration of the energy storage system on the power grid dispatching, and improve the user experience.

[0226] An embodiment of the present invention also provides an energy storage system. Figure 10 For the structural schematic diagram of an energy storage system provided by an embodiment of the present invention, refer to Figure 10 , the energy storage system 1000 includes: the state-of-charge calibration device 1001 of any energy storage system provided in the foregoing embodiment, and at least two energy storage batteries 1002; the state-of-charge calibration device 1001 of the energy storage system is used for the state-of-charge calibration method of any of the foregoing energy storage systems.

[0227] Optionally, the energy storage system 1000 further includes a DC conversion circuit 1003, a DC bus 1004, and an inverter circuit 1005 corresponding to each energy storage battery. The energy storage battery 1002 is connected to the DC bus 1004 through the corresponding DC conversion circuit 1003, and the DC conversion circuit 1003 is also connected to the state-of-charge calibration device 1001. The DC bus 1004 is connected to the power grid or load through the inverter circuit 1005 to realize the energy transfer between the energy storage system and the power grid and / or load. Among them, the DC conversion circuit 1003 can be a DC / DC circuit, and the start, shutdown, and function switching of the DC / DC circuit can be controlled by the state-of-charge calibration device 1001 to realize the energy exchange between the energy storage batteries 1002. The inverter circuit 1005 can be a DC / AC circuit to realize the connection and energy transfer between the DC energy storage system and the AC power grid and load.

[0228] The energy storage system provided in this embodiment, its state-of-charge calibration method and device determine a target energy storage battery according to the initial state-of-charge of each energy storage battery, and then, according to the state-of-charge of the target energy storage battery, control at least one energy storage battery in the energy storage system to perform energy regulation on the target energy storage battery, so that the target energy storage battery generates target state-of-charge data, and then calibrate the state-of-charge of the target energy storage battery according to the target state-of-charge data, realizing the static calibration of the state-of-charge of the energy storage system. During the state-of-charge calibration process, a part of the energy storage batteries are determined as the target energy storage batteries, reducing the number of energy storage batteries calibrated simultaneously, which can reduce the data processing volume and improve the calibration efficiency. Moreover, by using the energy storage batteries in the energy storage system to realize the energy regulation of the target energy storage battery, the energy exchange between the energy storage system and external devices during the state-of-charge calibration is avoided. The state-of-charge calibration method of the energy storage system provided in this embodiment can keep the total power in the energy storage system unchanged, realize the static calibration of the state-of-charge in the energy storage system, ensure that the total power of the energy storage system remains constant before and after the state-of-charge calibration, reduce the impact of the state-of-charge calibration of the energy storage system on the power grid dispatching, and improve the user experience.

[0229] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, combinations and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for calibrating the state of charge of an energy storage system, characterized in that, The energy storage system includes at least two energy storage batteries; The method for calibrating the state of charge of the energy storage system includes: When it is detected that the time interval since the previous state-of-charge calibration exceeds a second preset period, or when a calibration instruction is received, a preset control instruction is generated; In response to the preset control instruction, the initial state of charge of each energy storage battery is obtained; Based on the initial state of charge of the energy storage battery, a target energy storage battery is determined; Based on the initial state of charge of the target energy storage battery, at least one energy storage battery is controlled to perform energy regulation on the target energy storage battery to generate target state-of-charge data of the target energy storage battery; Based on the target state-of-charge data, the state of charge of the target energy storage battery is calibrated.

2. The method for calibrating the state of charge of the energy storage system according to claim 1, wherein The determining the target energy storage battery based on the initial state of charge of the energy storage battery includes: Based on the initial state of charge of the energy storage battery, comparing the initial state of charge with a preset threshold to generate a comparison result; Based on the comparison result, the target energy storage battery is determined.

3. The method for calibrating the state of charge of the energy storage system according to claim 2, wherein The comparing the initial state of charge with a preset threshold based on the initial state of charge of the energy storage battery to generate a comparison result includes: Based on the initial state of charge of the energy storage battery, subtracting the initial state of charge from a first preset value to generate a first comparison result; Based on the initial state of charge of the energy storage battery, subtracting the initial state of charge from a second preset value to generate a second comparison result; Wherein, the preset threshold includes a first preset value and a second preset value; the first preset value is less than the second preset value.

4. The method for calibrating the state of charge of the energy storage system according to claim 3, wherein The determining the target energy storage battery based on the comparison result includes: When the initial state of charge of the energy storage battery is less than or equal to the first preset value, determining the energy storage battery as the first target energy storage battery; and / or, When the initial state of charge of the energy storage battery is greater than or equal to the second preset value, determining the energy storage battery as the second target energy storage battery; Wherein, the target energy storage battery includes the first target energy storage battery and / or the second target energy storage battery.

5. The method for calibrating the state of charge of the energy storage system according to claim 4, wherein, The controlling at least one energy storage battery to perform energy regulation on the target energy storage battery based on the initial state of charge of the target energy storage battery to generate target state-of-charge data of the target energy storage battery includes: Based on the initial state of charge of the target energy storage battery, controlling the energy storage battery to perform energy regulation on the target energy storage battery; Obtaining the state data of the target energy storage battery after energy regulation; Comparing the state data with target state data to generate a comparison result; Based on the comparison result, generating target state-of-charge data of the target energy storage battery.

6. The method for calibrating the state of charge of the energy storage system according to claim 5, wherein The controlling the energy storage battery to perform energy regulation on the target energy storage battery based on the initial state of charge of the target energy storage battery includes: Based on the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery, controlling energy regulation between the first target energy storage battery and the second target energy storage battery; and / or, Control the standby energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery; Wherein, the standby energy storage battery is the energy storage battery whose initial state of charge is between the first preset value and the second preset value.

7. The method for calibrating the state of charge of the energy storage system according to claim 6, characterized in that, The controlling the energy regulation between the first target energy storage battery and the second target energy storage battery according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery includes: Control the first target energy storage battery to charge the second target energy storage battery according to the initial state of charge of the first target energy storage battery and the initial state of charge of the second target energy storage battery.

8. The method for calibrating the state of charge of the energy storage system according to claim 6, wherein The controlling the standby energy storage battery to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery includes: Control the standby energy storage battery to charge the second target energy storage battery according to the initial state of charge of the target energy storage battery; and / or, Control the first target energy storage battery to discharge to the standby energy storage battery according to the initial state of charge of the target energy storage battery.

9. The method for calibrating the state of charge of the energy storage system according to claim 5, wherein, The obtaining the state data of the target energy storage battery after energy regulation includes: Obtain the first state data of the first target energy storage battery and / or the second state data of the second target energy storage battery.

10. The method for calibrating the state of charge of the energy storage system according to claim 9, wherein, The comparing the state data with the target state data to generate a comparison result includes: Compare the first state data with the first target state data to generate a first comparison result; and / or, Compare the second state data with the second target state of charge data to generate a second comparison result; Wherein, the target state data includes the first target state data and the second target state data.

11. The method for calibrating the state of charge of the energy storage system according to claim 10, characterized in that, The generating the target state of charge data of the target energy storage battery according to the comparison result includes: When the first comparison result includes that the first state data is equal to the first target state data, generate the first target state of charge data of the target energy storage battery; and / or, When the second comparison result includes that the second state data is equal to the second target state data, generate the second target state of charge data of the target energy storage battery.

12. The method for calibrating the charge of the energy storage system according to claim 11, wherein The calibrating the state of charge of the target energy storage battery according to the target state of charge data includes: Calibrate the state of charge of the first target energy storage battery to the first target state of charge data to generate first calibration process data; and / or, calibrate the state of charge of the second target energy storage battery to the second target state of charge data to generate second calibration process data.

13. The method for calibrating the state of charge of the energy storage system according to claim 11, characterized in that, Before the calibrating the state of charge of the target energy storage battery according to the target state of charge data, it further includes: Let the target energy storage battery stand for a first preset period.

14. The method for calibrating the state of charge of the energy storage system according to claim 12, wherein, After the calibrating the state of charge of the target energy storage battery according to the target state of charge data, it further includes: Restore the state of charge of the energy storage battery to the initial state of charge; Store the first calibration process data and / or the second calibration process data of the energy storage battery.

15. A charge calibration device for an energy storage system, characterized in that, Includes: A data acquisition module, configured to generate a preset control instruction when it detects that a time interval from the previous charge calibration exceeds a second preset period, or when it receives a calibration instruction; It also responds to the preset control instruction to obtain the initial state of charge of each energy storage battery; A comparison and determination module, configured to determine a target energy storage battery according to the initial state of charge of the energy storage battery; An energy regulation module, configured to control at least one of the energy storage batteries to perform energy regulation on the target energy storage battery according to the initial state of charge of the target energy storage battery, and generate target state of charge data of the target energy storage battery; A calibration module, configured to calibrate the state of charge of the target energy storage battery according to the target state of charge data.

16. An energy storage system, comprising: The state-of-charge calibration device of the energy storage system according to claim 15, as well as at least two energy storage batteries, a DC conversion circuit corresponding to each energy storage battery one by one, a DC bus, and an inverter circuit; the state-of-charge calibration device of the energy storage system is used to execute the state-of-charge calibration method of the energy storage system according to any one of claims 1-14; the DC conversion circuit is connected to the state-of-charge calibration device, and the switch and function switching of the DC conversion circuit are controlled by the state-of-charge calibration device.

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