Energy storage equipment, control method and device thereof, energy storage power station and storage medium
Patent Information
- Application Number
- CN202311502463.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-10
- Publication Date
- 2025-05-13
Smart Images
Figure CN119994975A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery management technology, and specifically to an energy storage device and a control method and device thereof, an energy storage power station and a storage medium. Background Art
[0002] In most scenarios of current energy storage battery packs, the power of most battery packs is in a platform area, and the cell voltage changes little. It is difficult to calculate the power of the battery pack based solely on the OCV (Open Circuit Voltage) curve, resulting in inaccurate calculation of power and poor precision. Summary of the invention
[0003] In view of the above problems, the present application provides an energy storage device and a control method and apparatus thereof, an energy storage power station and a storage medium, which can determine the stage of calibrating the battery power according to the power demand of the power grid, and determine the battery cell to be calibrated from the battery cells that need to be calibrated according to the power demand of the power grid, and adjust the power of the battery cell to be calibrated according to the charge and discharge instructions, so as to calibrate the battery cell to be calibrated, thereby improving the power calculation accuracy of the battery cell.
[0004] In a first aspect, the present application provides a control method for an energy storage device, the energy storage device comprising a plurality of battery cells, the control method comprising: receiving a control instruction from a power grid, wherein the control instruction from the power grid comprises a required power and a charge and discharge instruction; when the required power from the power grid meets a preset condition, determining a battery cell to be calibrated according to the required power from the power grid and the power level of the battery cell to be calibrated; and adjusting the power level of the battery cell to be calibrated according to the charge and discharge instruction to calibrate the battery cell to be calibrated.
[0005] In the technical solution of the embodiment of the present application, the control instruction of the power grid is first received. The control instruction of the power grid generally may include the power demand, charging instruction, and discharging instruction of the power grid in the future. When the power demand of the power grid meets the preset conditions, it is considered that there will be a stage in the future when the battery to be calibrated can be calibrated. Then, according to the power demand of the power grid, the battery unit to be calibrated whose power meets the power demand of the power grid is selected from the battery units to be calibrated. Finally, the power of the battery unit to be calibrated is adjusted according to the charging and discharging instructions of the power grid. For example, when the charging and discharging instructions of the power grid include charging instructions, that is, the battery unit discharges to the power grid to meet the charging power demand of the power grid, and the power of the battery unit is reduced to a certain value at this time; when the charging and discharging instructions of the power grid include discharging instructions, that is, the power grid discharges to the battery unit and the battery unit charges to meet the discharge power demand of the power grid, and the power of the battery unit is increased to a certain value at this time. By reducing or increasing the power of the battery unit to the set value, the power calibration of the battery unit is realized, and the calculation accuracy of the power of the battery unit is improved.
[0006] In some embodiments, when the power demand of the power grid is less than a preset power threshold and lasts for a preset time, it is determined that the power demand of the power grid meets the preset condition. Thus, when the power demand of the power grid is small and lasts for a period of time, only some battery units are needed to meet the power demand of the power grid.
[0007] In some embodiments, the control method of the energy storage device further includes: obtaining the uncalibrated time of each battery cell; and taking the battery cells whose uncalibrated time reaches the preset calibration period and whose voltage value is within the preset voltage range as the battery cells that need to be calibrated. In this way, the power of the battery cells to be calibrated can be accurately calibrated, and the power calculation accuracy of the battery cells can be improved.
[0008] In some embodiments, the power of the battery cell to be calibrated is adjusted according to the charge and discharge instructions, including: when the control instruction of the power grid is a charging instruction, the power of the battery cell to be calibrated is adjusted to a first preset power range; when the control instruction of the power grid is a discharging instruction, the power of the battery cell to be calibrated is adjusted to a second preset power range; wherein the lower limit of the second preset power range is greater than the upper limit of the first preset power range. Thus, when the battery cell is in a high power stage or a low power stage, and the voltage of the battery cell changes greatly, the power of the battery cell can be calibrated, thereby improving the accuracy of the battery cell power calculation, and the precision is high.
[0009] In some embodiments, calibrating the battery cell to be calibrated includes: obtaining a voltage value when the power of the battery cell to be calibrated is adjusted to a first preset power range, or a voltage value when the power of the battery cell to be calibrated is adjusted to a second preset power range; and calibrating the battery cell to be calibrated according to the voltage value. Thus, the voltage value corresponding to the battery cell at the high power stage or the second power stage can be compared with the voltage value of the OCV curve at the same power level to calibrate the actual power level of the battery cell, instead of calculating the power of the battery cell based on the OCV curve in the platform area, thereby improving the calculation accuracy of the battery power.
[0010] In some embodiments, the control method of the energy storage device further includes: controlling multiple battery units to charge and discharge when the power demand of the power grid does not meet the preset conditions. Thus, when the power demand of the power grid is large, multiple battery units can be controlled to charge and discharge to meet the power demand of the power grid.
[0011] In some embodiments, the control method of the energy storage device further includes: when the power of the battery unit to be calibrated cannot meet the power demand of the power grid, controlling multiple battery units to charge and discharge to meet the power demand of the power grid.
[0012] In a second aspect, the present application provides a control device for an energy storage device, the energy storage device includes multiple battery cells, and the device includes: a receiving module for receiving control instructions from a power grid, wherein the control instructions from the power grid include required power and charge and discharge instructions; a determination module for determining a battery cell to be calibrated based on the required power of the power grid and the power level of the battery cell to be calibrated when the required power of the power grid meets a preset condition; and a control module for adjusting the power level of the battery cell to be calibrated based on the charge and discharge instructions so as to calibrate the battery cell to be calibrated.
[0013] In the technical solution of the embodiment of the present application, the receiving module first receives the control instruction of the power grid, and the control instruction of the power grid generally may include the power demand, charging instruction, and discharging instruction of the power grid in the future. When the power demand of the power grid meets the preset conditions, the determining module considers that there is a stage in the future that the battery to be calibrated can be calibrated, and then selects the battery unit to be calibrated whose power meets the power demand of the power grid from the battery units to be calibrated according to the power demand of the power grid, and finally the control module adjusts the power of the battery unit to be calibrated according to the charging and discharging instruction of the power grid. For example, when the charging and discharging instruction of the power grid includes the charging instruction, that is, the battery unit discharges to the power grid to meet the charging power demand of the power grid, at this time, the control module reduces the power of the battery unit to a certain value; when the charging and discharging instruction of the power grid includes the discharging instruction, that is, the power grid discharges to the battery unit and the battery unit charges to meet the discharge power demand of the power grid, at this time, the control module increases the power of the battery unit to a certain value, and by reducing or increasing the power of the battery unit to the set value, the power calibration of the battery unit is realized, and the calculation accuracy of the power of the battery unit is improved.
[0014] In some embodiments, the determination module is used to determine that the power demand of the power grid meets the preset condition when the power demand of the power grid is less than the preset power threshold and lasts for a preset time. Thus, when the power demand of the power grid is small and can last for a period of time, only some battery units are needed to meet the power demand of the power grid.
[0015] In some embodiments, the control device of the energy storage device further includes: an acquisition module for acquiring the uncalibrated time of each battery cell; and a determination module for taking the battery cells whose uncalibrated time reaches the preset calibration period and whose voltage value is within the preset voltage range as the battery cells that need to be calibrated. In this way, the power of the battery cells to be calibrated can be accurately calibrated, and the power calculation accuracy of the battery cells can be improved.
[0016] In some embodiments, the control module adjusts the power of the battery cell to be calibrated according to the charge and discharge instructions, specifically for: when the control instruction of the power grid is a charging instruction, adjusting the power of the battery cell to be calibrated to a first preset power range; when the control instruction of the power grid is a discharge instruction, adjusting the power of the battery cell to be calibrated to a second preset power range; wherein the lower limit of the second preset power range is greater than the upper limit of the first preset power range. Thus, when the battery cell is in a high power stage or a low power stage, and the voltage change of the battery cell is relatively large, the power of the battery cell can be calibrated, thereby improving the accuracy of the battery cell power calculation, and the precision is high.
[0017] In some embodiments, the control module calibrates the battery cell to be calibrated, specifically for: obtaining the voltage value when the power of the battery cell to be calibrated is adjusted to the first preset power range, or the voltage value when the power of the battery cell to be calibrated is adjusted to the second preset power range; calibrating the battery cell to be calibrated according to the voltage value. Thus, the voltage value corresponding to the battery cell in the high power stage or the second power stage can be compared with the voltage value of the OCV curve at the same power level to calibrate the actual power of the battery cell, instead of calculating the power of the battery cell based on the OCV curve in the platform area, which improves the calculation accuracy of the battery power.
[0018] In some embodiments, the control module is also used to control multiple battery units to charge and discharge when the power demand of the power grid does not meet the preset conditions. Thus, when the power demand of the power grid is large, multiple battery units can be controlled to charge and discharge to meet the power demand of the power grid.
[0019] In some embodiments, the control module is further used to control the charging and discharging of multiple battery cells to meet the power demand of the power grid when the power of the battery cell that needs to be calibrated cannot meet the power demand of the power grid.
[0020] In a third aspect, the present application provides a computer-readable storage medium on which a control program for an energy storage device is stored. When the control program for the energy storage device is executed by a processor, the control method for the energy storage device described above is implemented.
[0021] In a fourth aspect, the present application provides an energy storage device, including a memory, a processor, and a control program of the energy storage device stored in the memory and executable on the processor. When the processor executes the control program of the energy storage device, the above-mentioned control method of the energy storage device is implemented.
[0022] In a fifth aspect, the present application provides an energy storage power station, which includes the above-mentioned energy storage device.
[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:
[0025] Figure 1 A schematic diagram of a control method for an energy storage power station according to some embodiments of the present application;
[0026] Figure 2 A schematic diagram of an OCV curve of a battery cell according to some embodiments of the present application;
[0027] Figure 3 A schematic diagram of a battery unit according to some embodiments of the present application;
[0028] Figure 4 A schematic diagram of a control method for an energy storage power station according to some embodiments of the present application;
[0029] Figure 5 A schematic diagram of power grid demand for some embodiments of the present application;
[0030] Figure 6 A schematic diagram of a control device for an energy storage device according to some embodiments of the present application;
[0031] Figure 7 A schematic diagram of a control device for an energy storage device according to some embodiments of the present application;
[0032] Figure 8 A schematic diagram of an energy storage device according to some embodiments of the present application;
[0033] Fig. 9 Schematic diagram of an energy storage power station according to some embodiments of the present application. DETAILED DESCRIPTION
[0034] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.
[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.
[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).
[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.
[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0042] At present, in most scenarios of energy storage devices, each battery pack in the energy storage device is involved in charging and discharging, which makes the battery always in the platform area (for example, the battery power is between 30% and 80%). The battery power is determined according to the battery OCV curve. However, Figure 2 As shown in the figure, the horizontal axis represents the power (SOC) and the vertical axis represents the voltage. When the battery pack is in the platform area, the voltage change is relatively small, which will cause a large error in the calculation of the battery power and poor accuracy.
[0043] In order to improve the SOC accuracy, the present application starts from the working conditions and allows some battery packs (battery cells of the present application) that need to adjust the power to be charged high and discharged low under appropriate working conditions according to changes in the working conditions. That is, when the power grid needs to be charged (that is, the battery cells discharge to the power grid), the power of the battery cells that need to be calibrated is adjusted to be low-end aligned, and the battery cells are discharged; when the power grid needs to be discharged (that is, the power grid charges the battery cells), the power of the battery cells that need to be calibrated is adjusted to be high-end aligned, and the battery cells are charged, so that the power of the battery cells can be calibrated in the high power stage and the low power stage.
[0044] It should be noted that Figure 2 The OCV curve of the battery cell and the division of the corresponding area are only used as an example and are not intended to limit the present application.
[0045] For the convenience of explanation, the following embodiments are combined Figure 1 The control method of the energy storage device of the present application is described.
[0046] Reference Figure 1 , the control method of the energy storage device in the present application may include the following steps:
[0047] S1, receiving a control instruction of a power grid, wherein the control instruction of the power grid includes a required power and a charge and discharge instruction.
[0048] S2, when the power demand of the power grid meets a preset condition, determining the battery unit to be calibrated according to the power demand of the power grid and the power level of the battery unit to be calibrated.
[0049] S3, adjusting the power of the battery cell to be calibrated according to the charge and discharge instructions to calibrate the battery cell to be calibrated.
[0050] Specifically, the energy storage device will periodically enter the power calibration mode, and judge the power demand of the power grid in the future according to the power demand of the power grid, and judge whether the stage of power calibration of the battery unit is met in the future according to the power demand of the power grid. First, the control instruction of the power grid is received, and the control instruction of the power grid generally may include the power demand, charging instruction, and discharging instruction of the power grid in the future. When the power demand of the power grid meets the preset conditions, it is considered that there will be a stage in the future when the battery to be calibrated can be calibrated, and then, according to the power demand of the power grid, the battery unit to be calibrated whose power meets the power demand of the power grid is selected from the battery units that need to be calibrated, and finally, the power of the battery unit to be calibrated is adjusted according to the charging and discharging instructions of the power grid. For example, when the charging and discharging instructions of the power grid include charging instructions, that is, the battery cells discharge to the power grid to meet the charging power requirement of the power grid. At this time, the battery cells with higher power among the battery cells that need to be calibrated and can meet the power requirement of the power grid are used as battery cells to be calibrated, and the power of the battery cells to be calibrated is reduced to a certain value; when the charging and discharging instructions of the power grid include discharging instructions, that is, the power grid discharges to the battery cells and the battery cells charge to meet the discharge power requirement of the power grid, at this time, the battery cells with lower power among the battery cells that need to be calibrated and can meet the power requirement of the power grid are used as cells to be calibrated, and the power of the battery cells to be calibrated is increased to a certain value. By reducing or increasing the power of the battery cell to a set value, the power of the battery cell is in a high power stage or a low power stage, thereby realizing the power calibration of the battery cell and improving the power calculation accuracy of the battery cell.
[0051] It should be noted that the battery cell to be calibrated may be one or more, and the charging and discharging instructions of the power grid are taken as an example for explanation. When one battery cell with a higher charge among the battery cells to be calibrated can meet the power demand of the power grid, there may be one battery cell to be calibrated; when two battery cells with a higher charge among the battery cells to be calibrated can meet the power demand of the power grid, there may be two battery cells to be calibrated, and so on. In addition, when the charging and discharging instructions of the power grid include a discharging instruction, the number of battery cells to be calibrated is determined in the same way as when the charging and discharging instructions of the power grid include a charging instruction, and will not be repeated here.
[0052] In some embodiments, when the power demand of the power grid is less than a preset power threshold and lasts for a preset time, it is determined that the power demand of the power grid meets the preset condition. The preset power threshold and the preset time can be calibrated according to actual conditions, for example, the preset time can be 2 hours.
[0053] Specifically, according to the control instructions of the power grid, the power demand of the power grid can be analyzed. According to the power demand of the power grid, it can be determined whether all battery cells need to participate in charging and discharging. When the power demand of the power grid is less than the preset power threshold, it is considered that only some battery cells need to participate in charging and discharging. In order to realize the power calibration of the battery cells, the power demand of the power grid needs to be less than the preset power threshold for a period of time, and it is considered that the preset conditions for the power calibration of the battery cells are met. Therefore, when the power demand of the power grid is small and can last for a period of time, only some battery cells are needed to meet the power demand of the power grid.
[0054] In some embodiments, the control method of the energy storage device further includes: obtaining the uncalibrated time of each battery cell; and taking the battery cells whose uncalibrated time reaches the preset calibration period and whose voltage value is within the preset voltage range as the battery cells that need to be calibrated. The preset calibration period and the preset voltage range can be calibrated according to actual conditions, for example, the preset voltage range can be 3.1-3.2V.
[0055] Specifically, the calibration time of each battery cell is obtained to determine whether the uncalibrated time of the battery cell has reached the calibration cycle. When the uncalibrated time of the battery cell reaches the calibration cycle, the voltage value of the battery cell is further obtained. If the voltage value of the battery is within the preset voltage range, it is determined that the battery cell is in the platform area and needs to be calibrated. At this time, the battery cell is regarded as a battery cell that needs to be calibrated. Among them, the battery cell that needs to be calibrated can be one or more. When there are multiple battery cells that need to be calibrated, the battery cells to be calibrated in the current calibration cycle are determined according to the power of the battery cells that need to be calibrated and the required power of the power grid. In this way, the power of the battery cells to be calibrated can be accurately calibrated, and the accuracy of the battery cell power calculation can be improved.
[0056] In some embodiments, the power of the battery cell to be calibrated is adjusted according to the charge and discharge instructions, including: when the control instruction of the power grid is a charging instruction, adjusting the power of the battery cell to be calibrated to a first preset power range; when the control instruction of the power grid is a discharging instruction, adjusting the power of the battery cell to be calibrated to a second preset power range; wherein the lower limit value of the second preset power range is greater than the upper limit value of the first preset power range, the first preset power range can be 0-30%, and the second preset power range can be 80%-100%.
[0057] Specifically, when the charge and discharge instructions include a charge instruction, it is indicated that the battery cell to be calibrated is a battery cell with a higher power among the battery cells that need to be calibrated. After the battery cell to be calibrated is determined according to the power demand of the power grid, the battery cell to be calibrated is controlled to start discharging to the power grid until the power of the battery cell to be calibrated is reduced to the upper limit value of the first preset power range (such as 30%) or below, and then the battery cell to be calibrated is calibrated according to the voltage value corresponding to the power of the battery cell to be calibrated at this time. When the charge and discharge instructions include a discharge instruction, it is indicated that the battery cell to be calibrated is a battery cell with a higher power among the battery cells that need to be calibrated. After the battery cell to be calibrated is determined according to the power demand of the power grid, the battery cell to be calibrated is controlled to start charging, that is, the power grid discharges to the battery cell to be calibrated until the power of the battery cell to be calibrated is increased to the lower limit value of the second preset power range (such as 80%) or above, and then the battery cell to be calibrated is calibrated according to the voltage value corresponding to the power of the battery cell to be calibrated at this time. In this way, when the battery cell is in a high power stage or a low power stage, the power of the battery cell can be calibrated when the voltage of the battery cell changes greatly, thereby improving the accuracy of the battery cell power calculation, and the precision is high.
[0058] In some embodiments, calibrating the battery cell to be calibrated includes: obtaining a voltage value when the power of the battery cell to be calibrated is adjusted to within a first preset power range, or a voltage value when the power of the battery cell to be calibrated is adjusted to within a second preset power range; and calibrating the battery cell to be calibrated according to the voltage value.
[0059] Specifically, when the charge and discharge instructions include a charge instruction, after the power of the battery cell to be calibrated is reduced to or below the upper limit value of the first preset power range (such as 30%), the voltage value corresponding to the current power of the battery cell to be calibrated is obtained, and then the power of the battery cell to be calibrated is calibrated by comparing the voltage value according to the voltage value corresponding to the OCV curve at the current power. When the charge and discharge instructions include a discharge instruction, after the power of the battery cell to be calibrated is increased to or above the lower limit value (80%) of the second preset power range, and then the power of the battery cell to be calibrated is calibrated by comparing the voltage value according to the voltage value corresponding to the OCV curve at the current power. In this way, the voltage value corresponding to the battery cell in the high power stage or the second power stage can be compared with the voltage value of the OCV curve at the same power to calibrate the actual power of the battery cell, instead of calculating the power of the battery cell in the platform area by relying on the OCV curve, thereby improving the calculation accuracy of the battery power.
[0060] In some embodiments, the above-mentioned control method of the energy storage device further includes: when the power demand of the power grid does not meet the preset conditions, controlling the multiple battery units to charge and discharge.
[0061] That is to say, when the power demand of the power grid is relatively large, or when the power demand of the power grid is low but the duration does not reach the preset time, it is considered that it does not meet the stage of battery unit calibration. At this time, multiple battery units are controlled to charge and discharge to meet the power demand of the power grid. For example, when the charge and discharge instructions include a charge instruction, multiple battery units are controlled to discharge, that is, multiple battery units discharge to the power grid; when the charge and discharge instructions include a discharge instruction, multiple battery units are controlled to charge, that is, the power grid discharges to multiple battery units. In this way, when the power demand of the power grid is large, multiple battery units can be controlled to charge and discharge to meet the power demand of the power grid.
[0062] In some embodiments, the control method of the energy storage device further includes: when the power of the battery unit to be calibrated cannot meet the power demand of the power grid, controlling multiple battery units to charge and discharge to meet the power demand of the power grid.
[0063] Specifically, after obtaining the unit that needs to be calibrated, it is also determined whether the power demand of the power grid is met according to the power of the battery unit that needs to be calibrated. For example, when the power demand of the power grid is a charging instruction, if the power of the battery unit that needs to be calibrated is relatively low and cannot meet the needs of the power grid, then multiple battery units are controlled to discharge to the power grid to meet the power demand of the power grid; when the power demand of the power grid is a discharge instruction, if the power of the battery unit that needs to be calibrated is relatively high and cannot meet the power demand of the power grid, then multiple battery units are controlled to charge, that is, the power grid discharges to multiple battery units. As a specific example, the energy storage device includes multiple battery packs, each battery pack includes multiple battery cells, each battery pack is isolated from each other and can be respectively arranged in a container, and each battery cell can include multiple single cells. Each battery pack can be controlled by a PCS (Power Conversion System, energy storage converter) controller, and the PCS controller is connected to the battery pack through the high-voltage interface of the energy storage device. Among them, the PCS controller is an energy conversion module, which adjusts the output voltage of the energy storage device to meet the needs of high-voltage electrical devices and low-voltage electrical devices in the energy storage power station. The energy storage power station includes energy storage equipment and power-consuming equipment. The power-consuming equipment includes high-voltage power-consuming components and low-voltage power-consuming components. The low-voltage power-consuming components include controllers corresponding to each high-voltage power-consuming component. In some embodiments of the present application, the controllers in the energy storage power station are integrated into a domain controller. The domain controller controls the charging and discharging of the battery unit according to the characteristic parameters of the battery unit collected by the PCS controller and the required power of the power grid.
[0064] by Figure 4As shown in the example, multiple battery cells include battery cell 1, battery cell 2, ..., battery cell_n-1, and battery cell_n, and the PCS controller includes PCS1, PCS2, ..., PCS_m, wherein PCS1 is used to collect battery characteristic information of battery cell 1 and battery cell 2, and control the charging and discharging of battery cell 1 and battery cell 2 according to control instructions, similarly, PCS2 is used to collect battery characteristic information of battery cell 3 and battery cell 4, and control the charging and discharging of battery cell 3 and battery cell 4 according to control instructions, and PCS_m is used to collect battery characteristic information of battery cell_n-1 and battery cell_n, and control the charging and discharging of battery cell_n-1 and battery cell_n according to control instructions.
[0065] Combination Figure 4 The control method of the energy storage power station is explained. The energy storage domain controller periodically enters the battery unit calibration mode. According to the demand condition (the demand condition is the grid charging demand or the grid discharging demand), it determines the power demand of the grid in the next period of time and whether multiple battery units need to be fully charged and discharged at full power. Figure 5 As shown, in time period 1, if the power grid has a full charge and discharge demand, PCS1-PCS_m is controlled so that all battery cells 1-battery cell_n participate in charging and discharging. In time period 2, according to the power grid demand, it is not necessary for multiple battery cells to be fully charged and discharged. The domain controller determines that the battery cells that need to be calibrated are battery cells 1-battery cells 4, and whether battery cells 1-4 can meet the power and power demanded by the power grid in time period 2. If the power grid demand cannot be met, all PCSs are controlled so that all battery cells participate in charging and discharging. If it can be met, PCS1 and PCS2 are controlled in time period 2 so that battery cells 1-4 participate in charging and discharging, and other battery cells do not participate. The power of battery cells 1-4 is adjusted to less than 30%, or more than 80%, and the power of battery cells 1-4 is calibrated according to the OCV curve.
[0066] To sum up, in the technical solution of the embodiment of the present application, the stage of calibrating the battery power is determined according to the power demand of the power grid, and the battery cell to be calibrated is determined from the battery cells that need to be calibrated according to the power demand of the power grid, and the power of the battery cell to be calibrated is adjusted according to the charge and discharge instructions to calibrate the battery cell to be calibrated, thereby improving the accuracy of the battery cell power calculation.
[0067] Corresponding to the above embodiments, the present application also proposes a control device for an energy storage device.
[0068] like Figure 6As shown, the control device 100 of the battery energy storage device of the present application may include: a receiving module 110, used to receive control instructions from the power grid, wherein the control instructions from the power grid include required power and charge and discharge instructions; a determination module 120 is used to determine the battery cell to be calibrated according to the required power of the power grid and the power of the battery cell to be calibrated when the required power of the power grid meets a preset condition; and a control module 130 is used to adjust the power of the battery cell to be calibrated according to the charge and discharge instructions so as to calibrate the battery cell to be calibrated.
[0069] Specifically, the energy storage device will periodically enter the power calibration mode, determine the power demand of the power grid in the future period according to the demand conditions of the power grid, and determine whether the stage of power calibration of the battery unit is met in the future period according to the power demand of the power grid. The receiving module 110 receives the control instructions of the power grid, which generally may include the power demand, charging instructions, and discharging instructions of the power grid in the future period. When the power demand of the power grid meets the preset conditions, the determination module 120 believes that there will be a stage in the future period when the battery to be calibrated can be calibrated, and then selects the battery unit to be calibrated whose power meets the power demand of the power grid from the battery units that need to be calibrated, and finally the control module 130 adjusts the power of the battery unit to be calibrated according to the charging and discharging instructions of the power grid. For example, when the charging and discharging instructions of the power grid include charging instructions, that is, the battery cell discharges to the power grid to meet the charging power requirement of the power grid, at this time, the battery cell with a higher charge among the battery cells that need to be calibrated and can meet the power requirement of the power grid is used as the battery cell to be calibrated, and the control module 130 reduces the charge of the battery cell to be calibrated to a certain value; when the charging and discharging instructions of the power grid include discharging instructions, that is, the power grid discharges to the battery cell and the battery cell charges to meet the discharge power requirement of the power grid, at this time, the battery cell with a lower charge among the battery cells that need to be calibrated and can meet the power requirement of the power grid is used as the battery cell to be calibrated, and the control module 130 increases the charge of the battery cell to be calibrated to a certain value. By reducing or increasing the charge of the battery cell to a set value, the charge of the battery cell is in a high charge stage or a low charge stage, thereby realizing the charge calibration of the battery cell and improving the charge calculation accuracy of the battery cell.
[0070] In some embodiments, the determination module 120 is used to determine that the power demand of the power grid meets the preset condition when the power demand of the power grid is less than the preset power threshold and lasts for a preset time. The preset power threshold and the preset time can be calibrated according to actual conditions, for example, the preset time can be 2 hours.
[0071] Specifically, the determination module 120 can parse the power demand of the power grid according to the control instructions of the power grid, and can determine whether all battery cells need to participate in charging and discharging according to the power demand of the power grid. When the power demand of the power grid is less than the preset power threshold, it is considered that only some battery cells need to participate in charging and discharging. In order to realize the power calibration of the battery cells, the power demand of the power grid needs to be less than the preset power threshold for a period of time, and it is considered that the preset conditions for the power calibration of the battery cells are met. Therefore, when the power demand of the power grid is small and can last for a period of time, only some battery cells are needed to meet the power demand of the power grid.
[0072] In some embodiments, Figure 7 As shown, the control device of the energy storage device further includes: an acquisition module 140, which is used to acquire the uncalibrated time of each battery cell; and a determination module 120, which is also used to take the battery cells whose uncalibrated time reaches the preset calibration period and whose voltage value is within the preset voltage range as the battery cells that need to be calibrated. The preset calibration period and the preset voltage range can be calibrated according to actual conditions, for example, the preset voltage range can be 3.1-3.2V.
[0073] Specifically, the acquisition module 140 acquires the calibration time of each battery cell, and the determination module 120 uses this to determine whether the uncalibrated time of the battery cell has reached the calibration period. When the uncalibrated time of the battery cell reaches the calibration period, the acquisition module 140 further acquires the voltage value of the battery cell. If the voltage value of the battery is within the preset voltage range, the determination module 120 determines that the battery cell is in the platform area and needs to be calibrated. At this time, the battery cell is regarded as a battery cell that needs to be calibrated. Among them, the battery cell that needs to be calibrated can be one or more. When there are multiple battery cells that need to be calibrated, the battery cells to be calibrated in the current calibration period are determined according to the power of the battery cells that need to be calibrated and the required power of the power grid. In this way, the power of the battery cells to be calibrated can be accurately calibrated, and the accuracy of the battery cell power calculation can be improved.
[0074] In some embodiments, the control module 130 adjusts the power of the battery cell to be calibrated according to the charge and discharge instructions, specifically for: when the control instruction of the power grid is a charging instruction, adjusting the power of the battery cell to be calibrated to a first preset power range; when the control instruction of the power grid is a discharge instruction, adjusting the power of the battery cell to be calibrated to a second preset power range; wherein the lower limit value of the second preset power range is greater than the upper limit value of the first preset power range. The first preset power range can be 0-30%, and the second preset power range can be 80%-100%.
[0075] Specifically, when the charge and discharge instructions include a charge instruction, it indicates that the battery cell to be calibrated is a battery cell with a higher charge among the battery cells that need to be calibrated. After the determination module 120 determines the battery cell to be calibrated according to the power demand of the power grid, the control module 130 controls the battery cell to be calibrated to start discharging to the power grid until the charge of the battery cell to be calibrated is reduced to the upper limit value of the first preset charge range (such as 30%) or below, and then the battery cell to be calibrated is calibrated according to the voltage value corresponding to the charge of the battery cell to be calibrated at this time. When the charge and discharge instructions include a discharge instruction, it indicates that the battery cell to be calibrated is a battery cell with a higher charge among the battery cells that need to be calibrated. After the determination module 120 determines the battery cell to be calibrated according to the power demand of the power grid, the control module 130 controls the battery cell to be calibrated to start charging, that is, the power grid discharges to the battery cell to be calibrated until the charge of the battery cell to be calibrated is increased to the lower limit value of the second preset charge range (such as 80%) or above, and then the battery cell to be calibrated is calibrated according to the voltage value corresponding to the charge of the battery cell to be calibrated at this time. Therefore, when the battery cell is in a high power stage or a low power stage and the voltage of the battery cell changes greatly, the power of the battery cell can be calibrated, thereby improving the accuracy of the battery cell power calculation with high precision.
[0076] In some embodiments, the control module 130 calibrates the battery cell to be calibrated, specifically for: obtaining the voltage value when the power of the battery cell to be calibrated is adjusted to within a first preset power range, or the voltage value when the power of the battery cell to be calibrated is adjusted to within a second preset power range; calibrating the battery cell to be calibrated according to the voltage value.
[0077] Specifically, when the charge and discharge instructions include a charge instruction, after the power of the battery cell to be calibrated is reduced to or below the upper limit value of the first preset power range (such as 30%), the acquisition module 140 acquires the voltage value corresponding to the current power of the battery cell to be calibrated, and then the control module 130 calibrates the power of the battery cell to be calibrated by comparing the voltage value according to the voltage value corresponding to the OCV curve at the current power. When the charge and discharge instructions include a discharge instruction, after the power of the battery cell to be calibrated is increased to or above the lower limit value (80%) of the second preset power range, the control module 130 calibrates the power of the battery cell to be calibrated by comparing the voltage value according to the voltage value corresponding to the OCV curve at the current power. In this way, the voltage value corresponding to the battery cell in the high power stage or the second power stage can be compared with the voltage value of the OCV curve at the same power to calibrate the actual power of the battery cell, instead of calculating the power of the battery cell in the platform area by relying on the OCV curve, thereby improving the calculation accuracy of the battery power.
[0078] In some embodiments, the control module 130 is also used to control the charging and discharging of multiple battery units when the power demand of the power grid does not meet preset conditions.
[0079] That is to say, when the power demand of the power grid is relatively large, or when the power demand of the power grid is low but the duration does not reach the preset time, it is considered that it does not meet the stage of battery unit calibration. At this time, the control module 130 controls multiple battery units to charge and discharge to meet the power demand of the power grid. For example, when the charge and discharge instructions include a charge instruction, the control module 130 controls multiple battery units to discharge, that is, multiple battery units discharge to the power grid; when the charge and discharge instructions include a discharge instruction, the control module 130 controls multiple battery units to charge, that is, the power grid discharges to multiple battery units. In this way, when the power demand of the power grid is large, multiple battery units can be controlled to charge and discharge to meet the power demand of the power grid.
[0080] In some embodiments, the control module 130 is also used to control multiple battery cells to charge and discharge to meet the power demand of the power grid when the power of the battery cell that needs to be calibrated cannot meet the power demand of the power grid. Specifically, after obtaining the unit that needs to be calibrated, it is also determined whether the power demand of the power grid is met according to the power of the battery cell that needs to be calibrated. For example, when the power demand of the power grid is a charging instruction, if the power of the battery cell that needs to be calibrated is relatively low and cannot meet the needs of the power grid, the control module 130 controls multiple battery cells to discharge to the power grid to meet the power demand of the power grid; when the power demand of the power grid is a discharge instruction, if the power of the battery cell that needs to be calibrated is relatively high and cannot meet the power demand of the power grid, the control module 130 controls multiple battery cells to charge, that is, the power grid discharges to multiple battery cells.
[0081] It should be noted that for details not disclosed in the control device of the energy storage device in the embodiment of the present application, please refer to the details disclosed in the control method of the energy storage device in the embodiment of the present application, which will not be repeated here.
[0082] Corresponding to the above embodiments, the present application also proposes a computer-readable storage medium.
[0083] The computer-readable storage medium of the present application stores a control program for an energy storage device, and when the control program for the energy storage device is executed by a processor, the control method for the energy storage device described above is implemented.
[0084] Corresponding to the above embodiments, the present application also proposes an energy storage device.
[0085] like Figure 8As shown, the energy storage device 200 of the present application includes a memory 210, a processor 220, and a control program of the energy storage device stored in the memory 210 and executable on the processor 220. When the processor 220 executes the control program of the energy storage device, the above-mentioned control method of the energy storage device is implemented.
[0086] Corresponding to the above embodiments, the present application also proposes an energy storage power station.
[0087] like Fig. 9 As shown, the energy storage power station 300 of the present application includes the above-mentioned energy storage device 200.
[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A control method for an energy storage device, characterized in that: The energy storage device includes a plurality of battery cells, and the control method includes: Receiving a control instruction of a power grid, wherein the control instruction of the power grid includes a required power and a charge and discharge instruction; When the power demand of the power grid meets a preset condition, determining the battery unit to be calibrated according to the power demand of the power grid and the power of the battery unit to be calibrated; The power level of the battery unit to be calibrated is adjusted according to the charge and discharge instruction to calibrate the battery unit to be calibrated.
2. The control method according to claim 1, characterized in that: When the power demand of the power grid is less than a preset power threshold and lasts for a preset time, it is determined that the power demand of the power grid meets the preset condition.
3. The control method according to claim 1, characterized in that: Also includes: Get the uncalibrated time of each battery cell; The battery cells whose uncalibrated time reaches the preset calibration period and whose voltage value is within the preset voltage range are regarded as the battery cells that need to be calibrated.
4. The control method according to claim 3, characterized in that: The step of adjusting the power of the battery unit to be calibrated according to the charge and discharge instruction includes: When the control instruction of the power grid is a charging instruction, adjusting the power of the battery unit to be calibrated to a first preset power range; When the control instruction of the power grid is a discharge instruction, the power of the battery unit to be calibrated is adjusted to a second preset power range; wherein the lower limit value of the second preset power range is greater than the upper limit value of the first preset power range.
5. The control method according to claim 4, characterized in that: Calibrating the battery cell to be calibrated includes: Acquire a voltage value when the power of the battery cell to be calibrated is adjusted to within the first preset power range, or a voltage value when the power of the battery cell to be calibrated is adjusted to within the second preset power range; The battery unit to be calibrated is calibrated according to the voltage value.
6. The control method according to any one of claims 1 to 5, characterized in that: The method further comprises: When the power demand of the power grid does not meet the preset condition, the plurality of battery units are controlled to be charged and discharged.
7. The control method according to any one of claims 1 to 5, characterized in that: Also includes: When the power of the battery unit that needs to be calibrated cannot meet the power demand of the power grid, the multiple battery units are controlled to be charged and discharged.
8. A control device for an energy storage device, characterized in that: The energy storage device comprises a plurality of battery cells, and the apparatus comprises: A receiving module, used for receiving a control instruction of a power grid, wherein the control instruction of the power grid includes a required power and a charge and discharge instruction; A determination module, configured to determine the battery unit to be calibrated according to the power demand of the power grid and the power quantity of the battery unit to be calibrated when the power demand of the power grid meets a preset condition; The control module is used to adjust the power of the battery unit to be calibrated according to the charge and discharge instruction to calibrate the battery unit to be calibrated.
9. The control device according to claim 8, characterized in that: The determination module is used to determine that the power demand of the power grid meets the preset condition when the power demand of the power grid is less than a preset power threshold and lasts for a preset time.
10. The control device according to claim 8, characterized in that: Also includes: An acquisition module, used for acquiring the uncalibrated time of each battery cell; The determination module is further configured to select battery cells whose uncalibrated time reaches a preset calibration period and whose voltage value is within a preset voltage range as battery cells that need to be calibrated.
11. The control device according to claim 10, characterized in that: The control module adjusts the power of the battery unit to be calibrated according to the charge and discharge instruction, specifically for: When the control instruction of the power grid is a charging instruction, adjusting the power of the battery unit to be calibrated to a first preset power range; When the control instruction of the power grid is a discharge instruction, the power of the battery unit to be calibrated is adjusted to a second preset power range; wherein the lower limit value of the second preset power range is greater than the upper limit value of the first preset power range.
12. The control device according to claim 11, characterized in that: The control module calibrates the battery unit to be calibrated, specifically for: Acquire a voltage value when the power of the battery cell to be calibrated is adjusted to within the first preset power range, or a voltage value when the power of the battery cell to be calibrated is adjusted to within the second preset power range; The battery unit to be calibrated is calibrated according to the voltage value.
13. The control device according to any one of claims 8 to 12, characterized in that: The control module is also used to control the multiple battery units to charge and discharge when the required power of the power grid does not meet the preset conditions.
14. The control device according to any one of claims 8 to 12, characterized in that: The control module is also used to control the charging and discharging of the multiple battery cells when the power of the battery cell that needs to be calibrated cannot meet the power demand of the power grid.
15. A computer-readable storage medium, characterized in that: A control program of an energy storage device is stored thereon, and when the control program of the energy storage device is executed by a processor, a control method of the energy storage device according to any one of claims 1-7 is implemented.
16. An energy storage device, characterized in that: The invention comprises a memory, a processor and a control program of an energy storage device which is stored in the memory and can be run on the processor. When the processor executes the control program of the energy storage device, the control method of the energy storage device according to any one of claims 1 to 7 is implemented.
17. An energy storage power station, characterized in that: Comprising the energy storage device as claimed in claim 16.