Regulation system, energy storage system, and regulation method

Abstract

This application discloses an adjustment system, an energy storage system, and an adjustment method. The adjustment system includes a first power conversion device and a control unit, and a plurality of battery clusters of a battery system share the first power conversion device, and the control unit is communicatively connected to the first power conversion device and each of the battery clusters. The control unit disconnects the parallel connection between the target battery cluster and the other battery clusters, controls the target battery cluster and the first power conversion device to be conductive, and sends a target current command to the first power conversion device to adjust the target battery cluster, thereby eliminating the difference in the charging rate between the target battery cluster and the other battery clusters, and improving the constant power operation capability of the battery system. And, since the plurality of battery clusters of the present invention share one first power conversion device, the device cost is low, the cost required for heat dissipation is low, and there is no need to modify the conventional battery system, so that the retrofit cost is low.

Description

[Technical field]

[0001] The present application belongs to the technical field of new energy vehicles, and specifically relates to an adjustment system, an energy storage system, and an adjustment method.

[0002] CROSS REFERENCE TO RELATED APPLICATIONS This application claims priority based on a Chinese application filed on June 10, 2022, entitled "Adjustment System, Energy Storage System, and Adjustment Method" and bearing application number 202210654627.3, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] In the conventional energy storage system, multiple battery clusters are directly connected in parallel to the DC side of a power converter. Due to differences in the capacity of each cell, the internal resistance of the battery clusters, etc., the SOC of different battery clusters will be different, so the energy storage system cannot be discharged or charged at full power, and the energy storage capacity of the energy storage system will be greatly reduced. Summary of the Invention

[0004] In view of the above problems, the present application provides an adjustment system, an energy storage system, and an adjustment method that can solve the problem of current energy storage systems being unable to discharge and charge at full power due to differences in SOC of battery clusters.

[0005] In a first aspect, the present application provides a regulation system, the regulation system being configured to regulate a battery system, the battery system including a plurality of battery clusters, the regulation system including a first power converter and a control unit, a first end of the first power converter being connected in series with each of the battery clusters, a second end of the first power converter being connected with a power source, the control unit being communicatively connected with the first power converter and each of the battery clusters, the control unit being configured to control the first power converter to disconnect a parallel connection between a target battery cluster and other battery clusters and to electrically connect the target battery cluster to the first power converter.

[0006] In the technical solution of the embodiment of the present application, the present invention designs a first power conversion device to be connected in series with each of the battery clusters in the battery system, and designs a control unit to communicate with the first power conversion device and each of the battery clusters. Then, the parallel connection between the target battery cluster and the other battery clusters is cut off, and the target battery cluster and the first power conversion device are controlled to be conductive. Thus, the first power conversion device adjusts the target battery cluster based on the target current command to make the charging rate of the target battery cluster approach the target charging rate, i.e., the charging rate of the other battery clusters, thereby eliminating the difference in the charging rate between the target battery cluster and the other battery clusters, and improving the constant power operation capability of the battery system. And, since the present invention shares one first power conversion device with multiple battery clusters, the device cost is low, the cost required for heat dissipation is low, and there is no need to modify the conventional battery system, so the modification cost is low.

[0007] In some embodiments, the adjustment system further includes a plurality of first control switches and a plurality of second control switches, the number of the first control switches and the second control switches being equal to the number of the battery clusters, each of the battery clusters being connected in series with one first control switch and then connected in parallel with the other battery clusters, each of the battery clusters being connected in series with the first power converter through the second control switch, and the control unit is configured to control the first control switch connected with the target battery cluster to be turned off, thereby disconnecting the parallel connection between the target battery cluster and the other battery clusters, and controlling the second control switch between the target battery cluster and the first power converter to conduct the target battery cluster and the first power converter. According to the design of the control switch in this embodiment, it is possible to easily switch between the parallel connection between the target battery cluster and the other battery clusters and the series connection between the target battery cluster and the first power converter. As a result, when adjustment is performed on the target battery cluster, the switching control can be realized by a simple switch control, and in addition to realizing the function, the circuit design can be simplified, and the design cost and device cost can be saved.

[0008] In some embodiments, the second end of the first power conversion device is connected in parallel with any one of the plurality of battery clusters, thereby using the battery cluster connected in parallel with the second end of the first power conversion device as a power source. The embodiments of the present application can save the device cost of the power source by using the battery cluster connected in parallel as a power source.

[0009] In some embodiments, the battery system further comprises a power source, and the second end of the first power conversion device is connected to the power source.

[0010] In a second aspect, the present application provides an energy storage system, including a battery system and an adjustment system according to any one of the selectable embodiments in the first aspect, the battery system includes a plurality of battery clusters and a second power converter, the plurality of battery clusters are connected in parallel and then connected to the second power converter, a first end of the first power converter is connected in series with each of the battery clusters, a second end of the first power converter is connected to a power source, and a control unit is communicatively connected to the first power converter and each of the battery clusters.

[0011] In the technical solution of the embodiment of the present application, the present invention designs a first power converter to be connected in series with each of the battery clusters in the battery system, designs a control unit to communicate with the first power converter and each of the battery clusters, and controls the parallel connection between the target battery cluster and the other battery clusters to be disconnected and the target battery cluster and the first power converter to be conductive. Thus, the first power converter adjusts the target battery cluster according to the target current command to make the charging rate of the target battery cluster approach the target charging rate, i.e., the charging rate of the other battery clusters, thereby eliminating the difference in the charging rate between the target battery cluster and the other battery clusters, and improving the constant power operation capability of the energy storage system. And, since the present invention shares one first power converter with multiple battery clusters, the device cost is low, the cost required for heat dissipation is low, and there is no need to modify the conventional battery system, so that the modification cost is low.

[0012] In a third aspect, the present application provides an adjustment method, which includes the steps of: disconnecting a parallel connection between a target battery cluster and another battery cluster, controlling the target battery cluster and a first power conversion device to be conductive, and sending a target current command to the first power conversion device, and adjusting the target battery cluster by the first power conversion device based on the target current command.

[0013] In the technical solution of the embodiment of the present application, the present invention cuts off the parallel connection between the target battery cluster and the other battery clusters, controls the target battery cluster and the first power converter to be conductive, sends a target current command to the first power converter, and makes the first power converter adjust the target battery cluster according to the target current command so that the charging rate of the target battery cluster approaches the target charging rate, i.e., the charging rate of the other battery clusters, thereby eliminating the difference in charging rate between the target battery cluster and the other battery clusters, and improving the constant power operating ability of the energy storage system.

[0014] In some embodiments, before disconnecting the parallel connection between the target battery cluster and other battery clusters, the method further includes the steps of acquiring a charging rate of each battery cluster, and comparing the charging rate of each battery cluster with the target charging rate to determine a battery cluster whose charging rate satisfies a predetermined relationship with the target charging rate as the target battery cluster.

[0015] In some embodiments, the step of determining the battery cluster whose charging rate and the target charging rate satisfy a predetermined relationship as the target battery cluster includes the step of determining the battery cluster whose charging rate and the target charging rate have the largest difference as the target battery cluster. In this embodiment, the battery cluster whose absolute value of the difference between the charging rate and the target charging rate is determined as the target battery cluster, and the battery cluster whose SOC difference is the largest among the multiple battery clusters is adjusted, thereby effectively eliminating the SOC difference in the battery system and effectively improving the output power of the battery system.

[0016] In some embodiments, before sending the target current command to the first power converter, the method further includes: calculating the difference between the charging rate of the target battery cluster and the target charging rate to obtain the charging rate difference; calculating the current current value of the target battery cluster; calculating the target adjustment current value according to the charging rate difference and the current current value; and generating the target current command according to the target adjustment current value. This embodiment accurately calculates the target adjustment current value according to the charging rate difference and the current current value of the target battery cluster, and generates the target current command according to the target adjustment current value, thereby precisely controlling the adjustment to the target battery cluster by the first power converter, and more precisely adjusting the SOC of the target battery cluster.

[0017] In some embodiments, the step of obtaining a current value of the target battery cluster includes the steps of obtaining a bus voltage, a voltage of the first power conversion device, a battery voltage of the target battery cluster, and a resistance of the target battery cluster, calculating a difference between the bus voltage, the voltage of the first power conversion device, and the battery voltage of the target battery cluster to obtain a current voltage difference, and calculating a quotient between the current voltage difference and the resistance of the target battery cluster to obtain a current current value of the target battery cluster.

[0018] In some embodiments, before sending the target current command to the first power conversion device, the method further includes: calculating a difference between the charging rate of the target battery cluster and the target charging rate to obtain a charging rate difference; calculating a current current value of the target battery cluster; obtaining a current operating state of the battery system; determining a target adjustment current value based on the current operating state, the charging rate difference and the current current value of the target battery cluster; and generating a target current command based on the target adjustment current value.

[0019] In some embodiments, determining the target adjustment current value based on the current operating state, the charging rate difference, and the current current value of the target battery cluster includes determining a target adjustment factor based on the current operating state and the charging rate difference, and calculating the product of the target adjustment factor and the current current value of the target battery cluster to obtain the target adjustment current value.

[0020] In some embodiments, determining the target adjustment factor based on the current working state and the charging rate difference includes: determining the target adjustment factor to be a first predetermined factor when the current working state of the battery system is charging and the charging rate difference is greater than 0; determining the target adjustment factor to be a second predetermined factor when the current working state of the battery system is charging and the charging rate difference is less than 0; determining the target adjustment factor to be a third predetermined factor when the current working state of the battery system is discharging and the charging rate difference is greater than 0; and determining the target adjustment factor to be a fourth predetermined factor when the current working state of the battery system is discharging and the charging rate difference is less than 0, wherein the first predetermined factor and the fourth predetermined factor are less than 1, and the second predetermined factor and the third predetermined factor are greater than 1. In this embodiment, when the battery system is in a discharging state, if the SOC of the target battery cluster is higher than that of other battery clusters, the target battery cluster is discharged faster, and if the SOC of the target battery cluster is lower than that of other battery clusters, the target battery cluster is charged slower. This makes the SOC of multiple battery clusters uniform, thereby enabling the battery system to discharge all electrical energy as much as possible or charge to full charge, thereby improving the constant power operating capability of the energy storage system.

[0021] In some embodiments, before disconnecting the parallel connection between the target battery cluster and the other battery clusters, the method further includes the steps of: acquiring the battery voltage of each battery cluster before the plurality of battery clusters are connected in parallel; determining the battery cluster whose battery voltage satisfies a predetermined parallel connection condition as a battery cluster that can be connected in parallel; and controlling the plurality of battery clusters that can be connected in parallel to be connected in parallel. In this embodiment, before the battery system is energized, based on the battery voltage of each battery cluster, the battery cluster whose battery voltage satisfies a predetermined parallel connection condition is determined as a parallel-connected battery cluster, and all battery clusters that can be connected in parallel are connected in parallel, thereby preventing circulating current caused by parallel connection of battery clusters with too large SOC difference during energization, and improving the reliability of the battery system.

[0022] In some embodiments, the step of determining each battery cluster whose battery voltage satisfies a predetermined relationship as a battery cluster connectable in parallel includes the steps of determining all battery clusters whose battery voltages and target battery voltages are less than a first predetermined voltage threshold as battery clusters connectable in parallel, determining candidate battery clusters connectable in parallel from battery clusters whose battery voltages and target battery voltages are greater than the first predetermined voltage threshold and less than a second predetermined voltage threshold, and controlling the first power conversion device to perform voltage compensation on the candidate battery clusters connectable in parallel so that the candidate battery clusters connectable in parallel become battery clusters connectable in parallel.

[0023] In some embodiments, the step of determining a candidate battery cluster capable of being connected in parallel from battery clusters in which a difference between a battery voltage and a target battery voltage is greater than a first predetermined voltage threshold and less than a second predetermined voltage threshold includes the steps of: when there is only one battery cluster in which a difference between a battery voltage and a target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold, determining the battery cluster in which a difference between a battery voltage and a target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold as a candidate battery cluster capable of being connected in parallel; and when there are multiple battery clusters in which a difference between a battery voltage and a target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold, determining a battery cluster in which a difference between a battery voltage and a target battery voltage is smallest as a candidate battery cluster capable of being connected in parallel from among the multiple battery clusters in which a difference between a battery voltage and a target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold.

[0024] In a fourth aspect, the present application provides an adjustment device, the adjustment device being used in an adjustment system connected to a battery system, the battery system including a plurality of battery clusters, the adjustment device including a control module configured to control a target battery cluster to be disconnected from a parallel connection between the target battery cluster and other battery clusters and to connect the target battery cluster to a first power conversion device, and a transmission module configured to transmit a target current command to the first power conversion device and cause the first power conversion device to perform adjustment to the target battery cluster based on the target current command.

[0025] In the present invention, the adjustment device designed as above uses the control module to cut off the parallel connection between the target battery cluster and the other battery clusters, control the target battery cluster and the first power conversion device to be conductive, and the transmitting module sends a target current command to the first power conversion device, so that the first power conversion device adjusts the target battery cluster according to the target current command, so that the charging rate of the target battery cluster approaches the target charging rate, i.e., the charging rate of the other battery clusters, thereby eliminating the difference in charging rate between the target battery cluster and the other battery clusters, and improving the constant power operating ability of the energy storage system.

[0026] In a fifth aspect, the present application provides an electronic device comprising a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform a method according to any one of the selectable implementation manners in the third aspect.

[0027] In a sixth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, the computer program being adapted to, when executed by a processor, perform the method according to any one of the selectable implementations of the third aspect.

[0028] In a seventh aspect, the present application provides a computer program product, which, when executed on a computer, causes the computer to carry out a method according to any one of the alternative implementations of the third aspect.

[0029] The above is a brief summary of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, one can refer to the contents of the specification. In order to simplify the above and other objectives, features and advantages of the embodiments of the present application, the following provides specific embodiments of the present application.

[0030] The detailed description of the preferred embodiments below will enable those skilled in the art to understand various advantages of the present application. The drawings are merely illustrative of the preferred embodiments and are not intended to limit the present application. In all drawings, like reference numerals represent like parts. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a schematic configuration diagram of an adjustment system according to the present application. [Diagram 2] FIG. 2 is a second schematic configuration diagram of the adjustment system according to the present application. [Diagram 3] FIG. 3 is a schematic configuration diagram of the adjustment system according to the present application. [Figure 4] FIG. 4 is a schematic configuration diagram of the adjustment system according to the present application. [Diagram 5] FIG. 1 is a schematic configuration diagram of an energy storage system according to the present application. [Figure 6] 1 is a flowchart of the adjustment method according to the present application. [Figure 7] 2 is a second flowchart of the adjustment method according to the present application. [Figure 8] 3 is a flowchart of the adjustment method according to the present application. [Figure 9] 4 is a fourth flowchart of the adjustment method according to the present application. [Figure 10] 5 is a fifth flowchart of the adjustment method according to the present application. [Figure 11] 6 is a flowchart of the adjustment method according to the present application. [Figure 12] FIG. 2 is a schematic configuration diagram of an adjustment device according to the present application. [Figure 13] FIG. 1 is a schematic configuration diagram of an electronic device according to the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, the embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are merely illustrative for more clearly describing the technical solution of the present application, and are not intended to limit the scope of protection of the present application.

[0033] Unless otherwise specified, all technical and scientific terms used herein have the meanings that are commonly understood by those skilled in the art. All terms used herein are merely for describing specific examples and are not intended to limit the present application. The terms "include", "have" and any variations thereof in the description of the present application and claims and the above drawings mean inclusive and non-exclusive.

[0034] In the description of the embodiments of the present application, technical terms such as "first", "second", etc. are merely used to distinguish different elements, and do not express or imply relative importance, or dictate the number, particular order, or primary and secondary nature of technical features. Unless otherwise specified, in the description of the embodiments of the present application, "plurality" means two or more.

[0035] When the term "embodiment" is used in this specification, it means that a particular feature, configuration, or characteristic described using the embodiment is included in at least one embodiment of the present application. When the term is used in various parts of the specification, it does not necessarily refer to the same embodiment, and it is not intended to limit independent or alternative embodiments that are mutually exclusive with other embodiments. It is understood by those skilled in the art that the embodiments described in this specification may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is merely used to describe the relationship between related objects, and represents the existence of a triple relationship. For example, A and / or B represents a triple relationship in which only A exists, both A and B exist, and only B exists. In addition, the symbol " / " used in this specification generally represents the relationship between the objects before and after it as an "or" relationship.

[0037] In describing the embodiments of the present application, the term "plurality" means two or more (including two); similarly, "multiple sets" means two or more sets (including two sets); and "multiple sheets" means two or more sheets (including two sheets).

[0038] In describing the embodiments of the present application, directions or positional relationships expressed by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," "circumferential direction," etc., are based on the drawings and are merely intended to conveniently and simply describe the embodiments of the present application, and do not expressly or imply that the relevant devices or elements necessarily have a specific direction or are configured or operated in a specific direction, and therefore do not limit the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise specified, technical terms such as "attached", "coupled", "connected", and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral connection. It may also be a mechanical connection or an electrical connection. It may be a direct connection, an indirect connection via an intermediate, or the interiors of two elements may communicate with each other or the two elements may interact with each other. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific situation.

[0040] At present, from the perspective of market development, the applications of batteries are becoming more and more widespread. Batteries are not only used in energy storage power systems such as hydroelectric power stations, thermal power stations, wind power stations, and solar power stations, but also in electric transportation such as electric bicycles, electric motorcycles, and electric cars, military equipment, aerospace, and other fields. With the expansion of battery applications, market demand is also increasing.

[0041] In the conventional energy storage system, multiple battery clusters are directly connected in parallel to the DC side of the second power converter. Because there are differences in the capacity of each cell, the internal resistance of the battery cluster, and the temperature of the actual working environment of each battery cluster cannot be guaranteed to be completely consistent, there are differences in the state of charge (SOC) between different battery clusters. For example, the SOC of a certain battery cluster is the minimum value among the SOC values ​​of n battery clusters. During the discharging process, the battery cluster with the smallest SOC has the least amount of electricity, so it is fully discharged first, and reaches the discharge end voltage earlier than the designed time and stops working. The second power converter cannot continuously discharge at full power as designed, and the constant power operating ability of the energy storage system is greatly reduced. The same is true for the charging process.

[0042] The inventors of the present application have found that: In the conventional solution, a first power converter is installed in each battery cluster branch, and the first power converter equalizes the SOC of different battery clusters, so that the SOC of each battery cluster is equalized. In other words, the available electric energy of different battery clusters is always the same, and the problem of inconsistency caused by parallel connection between different battery clusters is solved. However, in the solution, a first power converter is connected in series to each branch, which increases the device cost in the design of the energy storage system, and the heat dissipation requirements of the original energy storage system cannot be met due to the addition of multiple first power converters, which may lead to changes in the heat dissipation design and increases the heat dissipation cost.

[0043] In view of the above problems, the inventors have designed a regulation system, an energy storage system and a regulation method, in which multiple battery clusters share a first power converter, and different battery clusters can be sequentially regulated under the control of the regulation method, thereby saving costs and solving the problem of SOC difference of different battery clusters.

[0044] The present application provides an adjustment system. As shown in FIG. 1, the adjustment system 1 can adjust a battery system 2. The battery system 2 includes a plurality of battery clusters 21, specifically including a battery cluster A1 to a battery cluster An. The plurality of battery clusters 21 are connected in parallel and then connected to a second power converter 22 to realize power output. Each battery cluster 21 includes a plurality of batteries 211 that are connected in series in sequence. The second power converter 22 can be a DC / AC converter or an inverter, and functions to convert the DC power supply of the plurality of battery clusters 21 connected in parallel into an AC power supply with a stable output voltage and frequency.

[0045] The adjustment system 1 includes a first power conversion device 10 and a control unit 20 , the control unit 20 being communicatively connected to the first power conversion device 10 .

[0046] When the adjustment system 1 adjusts the battery system 2, the adjustment system 1 and the battery system 2 are connected in a manner as shown in FIG. 1, in which a first end of the first power conversion device 10 is connected in series with each of the battery clusters 21, a second end of the first power conversion device 10 is connected to a power source C, and the control unit 20 can communicate with each of the battery clusters 21. The first power conversion device 10 may be a DC / DC conversion device, also called a switching power supply or switching regulator, which functions to convert an input voltage to effectively output a constant voltage. The control unit 20 may be a computing device with processing capabilities, including but not limited to a chip, a computer, a server, etc., and the control unit 20 may be a battery management system BMS or an energy storage system management server, etc.

[0047] Generally, all the battery clusters 21 in the battery system 2 are connected in parallel and are conductive, thereby transmitting electric energy to the second power converter to realize the output of electric energy. In a normal operation process, the control unit 20 can detect the charging rate of each battery cluster 21, and when the difference in charging rate is relatively large, the adjustment system 1 performs adjustment. In a specific adjustment process, the control unit 20 first identifies a target battery cluster that needs adjustment from the multiple battery clusters 21, and then cuts off the parallel connection between the target battery cluster and the other battery clusters, and controls the target battery cluster to be conductive with the first power converter 10. In this way, the first power converter 10 adjusts the target battery cluster according to the target current command, eliminating the difference in SOC between the target battery cluster and the other battery clusters, and improving the power output of the battery system. For example, battery clusters A1 to An are connected in parallel and then connected to the second power conversion device 22, and when the control unit 20 determines that the battery cluster A1 is the target battery cluster, the control unit cuts off the parallel connection between the battery cluster A1 and the other battery clusters and establishes electrical continuity between the battery cluster A1 and the first power conversion device 10. This causes the first power conversion device 10 to make an adjustment to the target battery cluster based on the target current command, so that the charging rate of the battery cluster A1 approaches the target charging rate, i.e., the charging rate of the other battery clusters.

[0048] The target battery cluster is a battery cluster whose charging rate and the target charging rate satisfy a predetermined relationship, and specifically, may be a battery cluster whose absolute value of the difference between the charging rate and the target charging rate is the largest, and may be any one of the multiple battery clusters whose difference between the charging rate and the target charging rate is greater than a predetermined value. The target charging rate may be an average value of the charging rates of the multiple battery clusters, or may be a maximum or minimum value of the charging rates of the multiple battery clusters.

[0049] After the relationship between the charging rate of the target battery cluster and the target charging rate satisfies a predetermined relationship, the control unit 20 disconnects the target battery cluster from the first power conversion device 10, and connects the target battery cluster to the battery system in parallel with the other battery clusters connected in parallel.

[0050] In the adjustment system designed as above, the present invention designs a first power conversion device to be connected in series with each of the battery clusters in the battery system, and designs a control unit to communicate with the first power conversion device and each of the battery clusters. Then, the parallel connection between the target battery cluster and the other battery clusters is cut off, and the target battery cluster and the first power conversion device are controlled to be conductive. In this way, the first power conversion device adjusts the target battery cluster based on the target current command, so that the charging rate of the target battery cluster approaches the target charging rate, i.e., the charging rate of the other battery clusters, thereby eliminating the difference in the charging rate between the target battery cluster and the other battery clusters, and improving the constant power operation capability of the energy storage system. And, since the present invention shares one first power conversion device with multiple battery clusters, the device cost is low, the cost required for heat dissipation is low, and there is no need to modify the conventional battery system, so the modification cost is low.

[0051] In some embodiments of this embodiment, as shown in FIG. 2 , the adjustment system further includes a plurality of first control switches K and a plurality of second control switches B, the number of the plurality of first control switches K and the plurality of second control switches B being equal to the number of the plurality of battery clusters 21, each of the battery clusters 21 being connected by one first control switch K and then connected in parallel with the other battery clusters, and each of the battery clusters 21 being connected to one second control switch B and then connected to the first power conversion device 10.

[0052] As shown in FIG. 2, for example, the battery cluster A1 is connected by a first control switch K and then connected in parallel with other battery clusters, and the battery cluster A1 is connected to a second control switch B and then connected to the first power conversion device 10.

[0053] Based on the circuit configuration shown in Fig. 2, the control unit 20 controls the first control switch K connected to the target battery cluster to be turned off, thereby disconnecting the parallel connection between the target battery cluster and the other battery clusters, and controls the second control switch B connected to the target battery cluster to be turned on, thereby controlling the target battery cluster to be conductive with the first power conversion device 10, thereby adjusting the target battery cluster by the first power conversion device 10. After the adjustment is completed, the control unit 20 controls the second control switch B connected to the target battery cluster to be turned off, thereby disconnecting the target battery cluster from the first power conversion device 10, and controls the first control switch K connected to the target battery cluster to be turned on, thereby connecting the target battery cluster in parallel with the other battery clusters.

[0054] The first control switch K and the second control switch B may be the same or different control switches. As a specific example, when the same control switch is used, the first control switch K and the second control switch B may both be a control switch such as a thyristor or a silicon controlled rectifier to realize control.

[0055] In the above embodiment, the control switch design of the present invention allows easy switching between the parallel connection of the target battery cluster with other battery clusters and the series connection of the target battery cluster with the first power converter, so that when the target battery cluster is adjusted, the switching control can be realized by simple switch control, and the function can be realized, and the circuit design can be simplified, and the design cost and device cost can be saved.

[0056] In some embodiments of the present embodiment, the second end of the first power conversion device 10 is connected in parallel to any one of the multiple battery clusters, thereby using the battery cluster connected in parallel to the second end of the first power conversion device 10 as the power source C. For example, as shown in FIG. 3, the second end of the first power conversion device 10 is connected in parallel to the battery cluster A1, so that the battery cluster A1 is used as the power source C.

[0057] In some embodiments of the present embodiment, as shown in Fig. 4, the regulating system 1 further includes a power source C, and the second end of the first power conversion device 10 is connected to the power source C. The power source C includes, but is not limited to, an independent battery, a supercapacitor, a DC bus, etc.

[0058] In some embodiments of the present embodiment, the first power conversion device 10 may be a non-isolated DC / DC conversion device or an isolated DC / DC conversion device. When the first power conversion device 10 is connected in series with the battery cluster, it may be connected to any one of both ends (positive or negative) of the battery cluster, or may be connected to a specific position in the battery cluster.

[0059] The present application provides an energy storage system 3. As shown in Fig. 5, the energy storage system 3 includes an adjustment system 1 according to any one of the above embodiments and the above battery system 2, and the connection method between the adjustment system 1 and the battery system 2 has been described above, so the description is omitted here.

[0060] The present application provides an adjustment method, which is used in the above adjustment system and is executed by a control unit in the above adjustment system. As shown in Figure 6, the adjustment method is realized in the following manner:

[0061] Step S600: The parallel connection between the target battery cluster and the other battery clusters is disconnected, and control is performed so that the target battery cluster and the first power conversion device are electrically connected to each other.

[0062] Step S610: Send a target current command to a first power conversion device, and have the first power conversion device make an adjustment to the target battery cluster according to the target current command.

[0063] In the above embodiment, the battery system 2 is generally described as a battery cluster connected in parallel to transmit electric energy to a second power converter to output electric energy. Based on this, the control unit communicates with each battery cluster to obtain the charge rate or SOC of each battery cluster in the current state, and compares the SOC of each battery cluster with a target charge rate (target SOC), and identifies a battery cluster whose relationship between the SOC and the target SOC satisfies a predetermined relationship as a target battery cluster. In the present invention, only one battery cluster is identified as a target battery cluster in one adjustment process and adjustment is performed.

[0064] After determining the target battery cluster, the present invention disconnects the parallel connection between the target battery cluster and other battery clusters, controls the target battery cluster and a first power conversion device to be conductive, and sends a target current command to the first power conversion device, so that the first power conversion device adjusts the target battery cluster based on the target current command to make the SOC of the target battery cluster approach the target SOC, thereby eliminating the SOC difference between the target battery cluster and other battery clusters, and improving the constant power operating capability of the energy storage system.

[0065] The target current command is generated by a target adjustment current, and the target adjustment current can be used to adjust the SOC of the target battery cluster. Specifically, the first power converter adjusts its own output voltage based on the target current command to adjust the current of the circuit connecting the first power converter and the target battery cluster, thereby adjusting the SOC of the target battery cluster.

[0066] In the present invention, the adjustment method designed as above cuts off the parallel connection between the target battery cluster and the other battery clusters, controls the target battery cluster and the first power converter to be conductive, sends a target current command to the first power converter, and adjusts the target battery cluster according to the target current command by the first power converter, so that the charging rate of the target battery cluster approaches the target charging rate, i.e., the charging rate of the other battery clusters, thereby eliminating the difference between the charging rates of the target battery cluster and the other battery clusters, and improving the constant power operating ability of the energy storage system.

[0067] In some embodiments of this embodiment, the present invention identifies a target battery cluster from a plurality of battery clusters in the following manner.

[0068] In a possible embodiment, the present invention collects the charging rate of each battery cluster, compares the charging rate of each battery cluster with the target charging rate, and determines the battery cluster with the largest absolute difference between the charging rate and the target charging rate as the target battery cluster.

[0069] In the embodiment designed as above, the present invention determines the battery cluster with the largest absolute difference between the charging rate and the target charging rate as the target battery cluster, and performs adjustment on the battery cluster with the largest SOC difference among the multiple battery clusters, thereby effectively eliminating the SOC difference in the battery system and effectively improving the output power of the battery system.

[0070] In another possible embodiment, the present invention collects the charging rate of each battery cluster, compares the charging rate of each battery cluster with the target charging rate, obtains a group of battery clusters whose difference between the charging rate and the target charging rate is greater than a predetermined value, and randomly selects one battery cluster from the group as the target battery cluster. The target charging rate may be the average charging rate of all battery clusters, or may be the SOC value of the battery cluster with the smallest SOC or the SOC value of the battery cluster with the largest SOC among all battery clusters.

[0071] In some embodiments of this embodiment, regarding the above-mentioned control unit sending a target current command to the first power conversion device, in a possible embodiment, as shown in FIG. 7, the present invention determines and generates the target current command in the following manner:

[0072] Step S700: Calculate the difference between the charging rate of the target battery cluster and the target charging rate to obtain the charging rate difference.

[0073] Step S710: Calculate the current value of the target battery cluster.

[0074] Step S720: Calculate a target adjustment current value based on the charging rate difference and the current current value.

[0075] Step S730: Generate a target current command based on the target adjustment current value.

[0076] In the above embodiment, the control unit calculates the difference between the SOC of the target battery cluster and the target SOC to obtain ΔSOC, which may be the average SOC value of all the battery clusters, or the maximum or minimum SOC value of all the battery clusters, as described above.

[0077] Then, the control unit calculates a current value of the target battery cluster, which represents a circuit current value after the target battery cluster and the first power converter are connected in series. The control unit according to the present invention may perform the calculation operations of steps S700 and S710 simultaneously, or one after the other, and is not limited by the present invention.

[0078] In a possible embodiment, the present current value of the target battery cluster is calculated in the following manner: As shown in FIG.

[0079] Step S800: Obtain the bus voltage, the voltage of the first power conversion device, the battery voltage of the target battery cluster, and the resistance of the target battery cluster.

[0080] Step S810: Calculate the difference between the bus voltage, the voltage of the first power conversion device, and the battery voltage of the target battery cluster to obtain a current voltage difference.

[0081] Step S820: Calculate the quotient of the current voltage difference and the resistance of the target battery cluster to obtain the current current value of the target battery cluster.

[0082] In the above embodiment, the voltage of the first power converter is the voltage of the first power converter after it is connected in series with the target battery cluster, the battery voltage of the target battery cluster is the voltage of the target battery cluster after it is connected in series with the first power converter, and the resistance of the target battery cluster is the total resistance of the circuit of the target battery cluster after it is connected in series with the first power converter. The bus voltage, the voltage of the first power converter, and the battery voltage of the target battery cluster can be sampled in real time by the control unit, and the resistance of the target battery cluster can be obtained by searching. Specifically, the present invention calculates the total resistance of each battery cluster after it is connected in series with the first power converter in advance, and stores the total resistance of each battery cluster and the corresponding battery cluster identifier in the control unit, so that the total resistance corresponding to the target battery cluster can be obtained by searching according to the target battery cluster identifier.

[0083] For the above embodiment, the present invention expresses the above calculation process by the following formula:

[0084] I 目 =(U 母 -U DC -U bat ) / R 総

[0085] U 母 is the bus voltage, and U DC is the voltage of the first power converter, and U bat is the battery voltage of the target battery cluster, and R 総 is the resistance of the target battery cluster.

[0086] Using the above method, the current value I 目 After calculating, the present invention calculates a target adjustment current value according to the charging rate difference and the current current value. In a specific embodiment, the present invention calculates an adjustable current value f(ΔSOC) of the first power converter according to the output power, adjustment capability and charging rate difference of the first power converter. Specifically, the adjustable current value f(ΔSOC) is calculated in the following manner:

[0087] f(ΔSOC) = K × [(1 + ΔSOC) n -1], (when ΔSOC>0),

[0088] f(ΔSOC) = -K × [(1 + ΔSOC) n -1], (when ΔSOC<0).

[0089] K is a linear coefficient and n is a power exponent. The values ​​of K and n can be appropriately changed according to the specific parameters of the first power conversion device, for example, the stronger the output power and regulating ability of the first power conversion device, the larger K and n are.

[0090] After calculating the adjustable current value f(ΔSOC) in the above manner, the present invention calculates a target adjustment current value based on the current current value and the adjustable current value. Specifically, the target adjustment current value I 2 is calculated in the following manner:

[0091] I 2 =I 目 +f(ΔSOC)

[0092] Target adjustment current value I 2 After calculating the target adjustment current value I 2 and sending a corresponding target current command to the first power converter, so that the first power converter adjusts the target regulating current value I 2 It adjusts its own voltage based on the target battery cluster current to achieve the effect of adjusting the current of the circuit in which the target battery cluster is located.

[0093] In another possible embodiment, in addition to the above method for calculating the target adjustment current value, the present invention also provides another method for calculating the target adjustment current value, as shown in Figure 9, which includes the following steps:

[0094] Step S900: Calculate the difference between the charging rate of the target battery cluster and the target charging rate to obtain the charging rate difference.

[0095] Step S910: Calculate the current value of the target battery cluster.

[0096] Step S920: Obtain the current operating status of the battery system.

[0097] Step S930: Determine a target adjustment current value according to the current working state, the charging rate difference and the current current value of the target battery cluster.

[0098] Step S940: Generate a target current command based on the target adjustment current value.

[0099] In the above embodiment, steps S900 and S910 are implemented in the same manner as steps S800 and S810, and therefore the description thereof will be omitted here. 目 After calculating, the present invention obtains the current working state of the battery system, where the current working state of the battery system includes charging or discharging, where charging represents that all the battery clusters in the battery system are in a charging state, and discharging represents that all the battery clusters in the battery system are in a discharging state.

[0100] Based on the above, the present invention first determines the target adjustment coefficient x according to the current working state and the charging rate difference, and then calculates the target adjustment coefficient x and the current current value I 目 Multiplying this to get the target adjustment current value I 2 That is, I 2 =xI 目 get.

[0101] Specifically, the present invention determines the target adjustment coefficient x in the following manner:

[0102] When the current operating state of the battery system is charging and the charging rate difference is greater than 0, the target adjustment coefficient x is equal to or smaller than a first predetermined coefficient x 1 It is determined that this is the case.

[0103] When the current working state of the battery system is charging and the charging rate difference is less than 0, the target adjustment coefficient x is equal to or smaller than a second predetermined coefficient x 2 It is determined that this is the case.

[0104] When the current working state of the battery system is discharging and the charging rate difference is greater than 0, the target adjustment coefficient x is equal to or smaller than a third predetermined coefficient x 3 It is determined that this is the case.

[0105] When the current working state of the battery system is discharging and the charging rate difference is less than 0, the target adjustment coefficient x is equal to or smaller than a fourth predetermined coefficient x 4 It is determined that this is the case.

[0106] First specified coefficient x 1 and the fourth predetermined coefficient x 4 is less than 1, and the second predetermined coefficient x 2 and the third predetermined coefficient x 3 is greater than 1. The first predetermined coefficient x 1 and the fourth specified coefficient x 4 may be the same, for example, both are 0.95, or may be different, for example, x 1 is 0.95 and x 4 is 0.9. The second specified coefficient x 2 and the third predetermined coefficient x 3 may be the same, for example, both are 1.05, or may be different, for example, x 2 is 1.05, and x 3 The target adjustment coefficient is 1.1. The target adjustment coefficient is merely an example for easy understanding, and the target adjustment coefficient of the present invention can be adjusted to be larger or smaller according to the actual scene.

[0107] The principle of the above embodiment is that when the battery system is in a charging state, if the SOC of the target battery cluster is higher than that of the other battery clusters, the charging of the target battery cluster is slowed down, and if the SOC of the target battery cluster is lower than that of the other battery clusters, the charging of the target battery cluster is speeded up.

[0108] When the battery system is in a discharging state, when the SOC of the target battery cluster is higher than that of the other battery clusters, the target battery cluster is discharged faster, and when the SOC of the target battery cluster is lower than that of the other battery clusters, the target battery cluster is charged slower, thereby making the SOC of the multiple battery clusters uniform, and thus allowing the battery system to discharge all the electric quantity as much as possible or charge to full charge, thereby improving the constant power operation capability of the energy storage system.

[0109] In some embodiments of the present invention, the above-mentioned scenarios are all scenarios in which the battery clusters in the battery system are connected in parallel and working. The present invention further performs detection and compensation on the battery clusters in the battery system before the battery clusters are energized to prevent circulating current in the battery system. As shown in Figure 10, the present invention includes the following steps:

[0110] Step S1000: Before the multiple battery clusters are connected in parallel, the battery voltage of each battery cluster is obtained.

[0111] Step S1010: A battery cluster whose battery voltage satisfies a predetermined parallel connection condition is determined as a battery cluster that can be connected in parallel.

[0112] Step S1020: Control is performed so that a plurality of battery clusters that can be connected in parallel are connected in parallel.

[0113] In the above embodiment, before the battery system is energized, each battery cluster may have a certain battery voltage. For example, when the power was turned off last time, the electric energy stored in the batteries in the battery cluster may not be completely consumed. Based on this, the control unit obtains the battery voltage of each battery cluster, and determines the battery cluster whose battery voltage satisfies a predetermined parallel connection condition as a battery cluster that can be connected in parallel based on the battery voltage of each battery cluster, and controls the parallel connection of the multiple battery clusters that can be connected in parallel.

[0114] In the above embodiment, the present invention determines the battery clusters whose battery voltages satisfy a certain parallel connection condition as the battery clusters that can be connected in parallel based on the battery voltages of the battery clusters before the battery system is energized, and connects all the battery clusters that can be connected in parallel in parallel, thereby preventing circulating current caused by parallel connection of battery clusters with too large SOC difference when energized, and improving the reliability of the battery system.

[0115] In some embodiments of this embodiment, as shown in FIG. 11, the present invention establishes a parallel-connectable battery cluster in a manner that includes the following steps:

[0116] Step S1100: All battery clusters in which the difference between the battery voltage and the target battery voltage is less than a first predetermined voltage threshold are determined as battery clusters that can be connected in parallel.

[0117] Step S1110: Determine a candidate battery cluster that can be connected in parallel from battery clusters in which the difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold.

[0118] Step S1120: Control the first power converter to perform voltage compensation on the candidate battery clusters that can be connected in parallel, so that the candidate battery clusters that can be connected in parallel become battery clusters that can be connected in parallel.

[0119] In the above embodiment, the present invention pre-sets a first predetermined voltage threshold UA and a second predetermined voltage threshold UB, the second predetermined voltage threshold UB is greater than the first predetermined voltage threshold UA, and the second predetermined voltage threshold UB is set according to the voltage regulation capability of the first power conversion device.

[0120] After obtaining the battery voltages of each battery cluster, the present invention calculates the voltage difference between each battery voltage and a target battery voltage, and compares the voltage difference with a first predetermined voltage threshold UA and a second predetermined voltage threshold UB.

[0121] When the voltage difference between the battery voltage of the battery cluster and the target battery voltage is less than the first predetermined voltage threshold UA, the battery cluster is determined as a battery cluster that can be connected in parallel.

[0122] When the voltage difference between the battery voltage of the battery cluster and the target battery voltage is greater than the first predetermined voltage threshold UA, it is determined whether the voltage difference between the battery voltage of the battery cluster and the target battery voltage is less than the second predetermined voltage threshold UB. If it is less than the second predetermined voltage threshold UB, the first power conversion device compensates only one battery cluster so that the battery voltage of the battery cluster approaches the target battery voltage and participates in parallel connection. Based on this, the present invention determines the battery cluster as a candidate battery cluster that can be connected in parallel when there is only one battery cluster whose voltage difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold UA and less than the second predetermined voltage threshold UB, and controls the first power conversion device to perform voltage compensation on the candidate battery cluster that can be connected in parallel so that the candidate battery cluster that can be connected in parallel becomes a battery cluster that can be connected in parallel.

[0123] When there are multiple battery clusters whose voltage difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold UA and less than the second predetermined voltage threshold UB, the battery cluster whose voltage difference between the battery voltage and the target battery voltage is the largest is determined as the candidate battery cluster for parallel connection. Of course, in addition to determining the battery cluster whose voltage difference between the battery voltage and the target battery voltage is the largest as the candidate battery cluster, the present invention may also randomly select one battery cluster from the multiple battery clusters whose voltage difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold UA and less than the second predetermined voltage threshold UB as the candidate battery cluster for parallel connection.

[0124] If the voltage difference between the battery voltage of the battery cluster and the target battery voltage exceeds the second predetermined voltage threshold UB, the difference between the battery voltage of the battery cluster and the target battery voltage is too large, and the first power conversion device cannot adjust it, in which case the battery cluster will not be connected in parallel.

[0125] FIG. 12 is a schematic block diagram of an adjustment device according to the present application. The device corresponds to the embodiment of the method shown in FIG. 6 to FIG. 11, and can execute steps related to the above method. The specific functions of the device can be referred to the above contents, and therefore, to avoid repetition, detailed description will be omitted here. The device includes at least one software function module stored in a memory in the form of software or firmware, or embedded in an operating system (OS) of the device. Specifically, the device includes a control module 1200 and a sending module 1210. The control module 1200 is configured to control the target battery cluster to disconnect the parallel connection between the target battery cluster and the other battery clusters and to connect the target battery cluster to a first power conversion device. The sending module 1210 is configured to send a target current command to the first power conversion device, and to cause the first power conversion device to adjust the target battery cluster based on the target current command.

[0126] In the present invention, the adjustment device designed as above uses the control module to cut off the parallel connection between the target battery cluster and the other battery clusters, control the target battery cluster and the first power conversion device to be conductive, and the transmitting module sends a target current command to the first power conversion device, so that the first power conversion device adjusts the target battery cluster according to the target current command, so that the charging rate of the target battery cluster approaches the target charging rate, i.e., the charging rate of the other battery clusters, thereby eliminating the difference in charging rate between the target battery cluster and the other battery clusters, and improving the constant power operating ability of the energy storage system.

[0127] In some embodiments of this embodiment, the device further includes a collection module 1220 and a determination module 1230. The collection module 1220 is configured to collect the charging rate of each battery cluster, and the determination module 1230 is configured to compare the charging rate of each battery cluster with a target charging rate, and determine a battery cluster whose charging rate and the target charging rate satisfy a predetermined relationship as a target battery cluster.

[0128] In some embodiments of this embodiment, the determination module 1230 is specifically configured to determine the battery cluster having the largest absolute value of the difference between the charging rate and the target charging rate as the target battery cluster.

[0129] In some embodiments of this embodiment, the apparatus further includes a calculation module 1240 and a generation module 1250. The calculation module 1240 is configured to calculate a difference between a charging rate of the target battery cluster and a target charging rate to obtain a charging rate difference, calculate a current current value of the target battery cluster, and calculate a target adjustment current value based on the charging rate difference and the current current value, and the generation module 1250 is configured to generate a target current command based on the target adjustment current value.

[0130] In some embodiments of this embodiment, the calculation module 1240 is specifically configured to obtain the bus voltage, the voltage of the first power conversion device, the battery voltage of the target battery cluster, and the resistance of the target battery cluster, calculate the difference between the bus voltage, the voltage of the first power conversion device, and the battery voltage of the target battery cluster to obtain a current voltage difference, and calculate the quotient of the current voltage difference and the resistance of the target battery cluster to obtain a current current value of the target battery cluster.

[0131] In some embodiments of this embodiment, the calculation module 1240 is further configured to calculate a difference between the charging rate of the target battery cluster and the target charging rate to obtain a charging rate difference, and calculate a current current value of the target battery cluster. The apparatus further includes an acquisition module 1260, which is configured to obtain a current operating state of the battery system. The determination module 1230 is further configured to determine a target adjustment current value based on the current operating state, the charging rate difference, and the current current value of the target battery cluster. The generation module 1250 is further configured to generate a target current command based on the target adjustment current value.

[0132] In some embodiments of this embodiment, the determination module 1230 is specifically configured to determine a target adjustment coefficient based on a current working state and a charging rate difference, and calculate the product of the target adjustment coefficient and the current current value of the target battery cluster to obtain a target adjustment current value.

[0133] In some embodiments of this embodiment, the determination module 1230 is further specifically configured to determine that the target adjustment factor is a first predetermined factor when the current working state of the battery system is charging and the charging rate difference is greater than 0, determine that the target adjustment factor is a second predetermined factor when the current working state of the battery system is charging and the charging rate difference is less than 0, determine that the target adjustment factor is a third predetermined factor when the current working state of the battery system is discharging and the charging rate difference is greater than 0, and determine that the target adjustment factor is a fourth predetermined factor when the current working state of the battery system is discharging and the charging rate difference is less than 0. The first predetermined factor and the fourth predetermined factor are less than 1, and the second predetermined factor and the third predetermined factor are greater than 1.

[0134] In some embodiments of this embodiment, the acquisition module 1260 is further configured to acquire a battery voltage of each battery cluster before the plurality of battery clusters are connected in parallel. The determination module 1230 is further configured to determine each battery cluster in which the relationship between each battery voltage and the target battery voltage satisfies a predetermined relationship as a battery cluster that can be connected in parallel. The control module 1200 is further configured to control the plurality of battery clusters that can be connected in parallel to be connected in parallel.

[0135] In some embodiments of this embodiment, the determination module 1230 is further configured to specifically determine all battery clusters whose difference between the battery voltage and the target battery voltage is less than a first predetermined voltage threshold as battery clusters that can be connected in parallel, determine candidate battery clusters that can be connected in parallel from battery clusters whose difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than a second predetermined voltage threshold, and control the first power conversion device to perform voltage compensation on the candidate battery clusters that can be connected in parallel, so that the candidate battery clusters that can be connected in parallel become battery clusters that can be connected in parallel.

[0136] In some embodiments of this embodiment, the determination module 1230 is further specifically configured to: determine, when the number of battery clusters whose difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold is one, the battery cluster whose difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold is one, and determine, when the number of battery clusters whose difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold is multiple, the battery cluster whose difference between the battery voltage and the target battery voltage is the smallest among the multiple battery clusters whose difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold is one, as the candidate battery cluster that can be connected in parallel.

[0137] In some embodiments of the present application, as shown in FIG. 13, the present application provides an electronic device 13. The electronic device 13 includes a processor 1301 and a memory 1302, and the processor 1301 and the memory 1302 are connected to each other by a communication bus 1303 and / or other types of connection mechanism (not shown) to communicate with each other. A computer program executable by the processor 1301 is stored in the memory 1302, and when the computing device operates, the processor 1301 executes the computer program to execute a method executed by an external computer in any one of the possible implementation methods, for example, steps S600 to S610. That is, the parallel connection between the target battery cluster and the other battery clusters is disconnected, the target battery cluster and the first power conversion device are controlled to be conductive, and a target current command is sent to the first power conversion device, and the first power conversion device adjusts the target battery cluster based on the target current command.

[0138] The present application provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the method in any one of the above-mentioned selectable implementation manners is realized.

[0139] The storage medium can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as a Static Random Access Memory (SRAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), an Erasable Programmable Read Only Memory (EPROM), a Programmable Red-Only Memory (PROM), a Read-Only Memory (ROM), a magnetic memory, a flash memory, a magnetic disk, or an optical disk.

[0140] The present application provides a computer program product, which, when executed on a computer, causes the computer to carry out a method in any one of the selectable implementations.

[0141] The above examples are merely for illustrating the technical solution of the present application, and are not intended to limit it. Although the present application has been described in detail with reference to the above examples, those skilled in the art may modify the technical solutions described in the above examples, and may make equivalent substitutions for some or all of the technical features. These modifications or substitutions do not deviate the essence of the corresponding technical solution from the scope of the technical solutions of the embodiments of the present application, and fall within the scope of the claims and the specification of the present application. In particular, as long as there is no contradiction in the structure, the technical features of each embodiment may be arbitrarily combined. The present application is not limited to the specific embodiments described, and includes all technical solutions that fall within the scope of the claims. [Explanation of symbols]

[0142] 1 Adjustment system 10 First power conversion device 20 Control Unit 2 Battery System 21 Battery Cluster 22 Second power conversion device K First control switch B Second control switch C power source 3. Energy Storage Systems 1200 Control Module 1210 Transmitting Module 1220 Harvesting Module 1230 Confirmation Module 1240 Computing Module 1250 Generation Module 1260 Acquisition Module 13 Electronic equipment 1301 Processor 1302 Memory 1303 Communication Bus

Claims

1. 1. A regulation system comprising: the regulation system is configured to regulate a battery system, the battery system comprising a plurality of battery clusters; The regulation system includes a first power conversion device and a control unit, a first end of the first power conversion device is connected in series with each of the battery clusters, a second end of the first power conversion device is connected to a power source, and the control unit is communicatively connected to the first power conversion device and each of the battery clusters; The control unit is configured to control the target battery cluster to disconnect a parallel connection between the target battery cluster and another battery cluster, and to conduct electricity between the target battery cluster and the first power conversion device. A regulation system comprising:

2. The adjustment system further includes a plurality of first control switches and a plurality of second control switches, the number of the first control switches and the second control switches being equal to the number of the battery clusters; Each of the battery clusters is connected in series with one first control switch and then connected in parallel with another battery cluster, and each of the battery clusters is connected in series with the first power conversion device via a second control switch; The control unit is configured to control a first control switch connected to the target battery cluster to be turned off, thereby disconnecting a parallel connection between the target battery cluster and another battery cluster, and to control a second control switch between the target battery cluster and the first power conversion device to conduct between the target battery cluster and the first power conversion device.

2. The adjustment system according to claim 1 .

3. A second end of the first power conversion device is connected in parallel to any one of the plurality of battery clusters, thereby using the battery cluster connected in parallel to the second end of the first power conversion device as the power source.

3. Regulating system according to claim 1 or 2.

4. The regulating system further includes a power source, and a second end of the first power conversion device is connected to the power source.

3. Regulating system according to claim 1 or 2.

5. 1. An energy storage system comprising: The energy storage system includes a battery system and the adjustment system according to any one of claims 1 to 4, the battery system including a plurality of battery clusters and a second power conversion device, the plurality of battery clusters are connected in parallel and then connected to the second power conversion device, a first end of the first power conversion device is connected in series with each of the battery clusters, a second end of the first power conversion device is connected to a power source, and the control unit is communicatively connected to the first power conversion device and each of the battery clusters.

1. An energy storage system comprising:

6. A step of disconnecting a parallel connection between the target battery cluster and another battery cluster and controlling the target battery cluster to be conductive with a first power conversion device; sending a target current command to the first power converter and causing the first power converter to make an adjustment to the target battery cluster based on the target current command. The adjustment method according to claim 1,

7. Before disconnecting the parallel connection between the target battery cluster and other battery clusters, the adjustment method includes: sampling the charge rate of each battery cluster; and determining, as the target battery cluster, a battery cluster whose charging rate satisfies a predetermined relationship between the charging rate of each battery cluster and the target charging rate. The adjustment method according to claim 6 .

8. The method further includes determining a battery cluster having a largest absolute value of the difference between the charging rate and the target charging rate as the target battery cluster. The adjustment method according to claim 6 or 7.

9. Before sending a target current command to the first power converter, the method of regulation further comprises: calculating a difference between the charging rate of the target battery cluster and the target charging rate to obtain a charging rate difference; obtaining a current value of the target battery cluster; calculating a target adjustment current value based on the charging rate difference and a current current value; generating the target current command based on the target adjustment current value. The adjustment method according to any one of claims 6 to 8.

10. The step of obtaining a current value of the target battery cluster includes: obtaining a bus voltage, a voltage of a first power converter, a battery voltage of a target battery cluster, and a resistance of the target battery cluster; Calculating the difference between the bus voltage and the voltage of the first power conversion device and the battery voltage of the target battery cluster to obtain a current voltage difference; calculating a quotient of the current voltage difference and the resistance of the target battery cluster to obtain a current current value of the target battery cluster. The adjustment method according to claim 9 .

11. Before sending a target current command to the first power converter, the method of regulation further comprises: calculating a difference between the charging rate of the target battery cluster and the target charging rate to obtain a charging rate difference; obtaining a current value of the target battery cluster; obtaining a current operating status of the battery system; determining a target adjustment current value according to the current working state, the charging rate difference and the current current value of the target battery cluster; generating the target current command based on the target adjustment current value. The adjustment method according to any one of claims 6 to 8.

12. determining a target adjustment current value based on the current working state, the charging rate difference, and the current current value of the target battery cluster; determining a target adjustment coefficient based on the current operating state and the charging rate difference; calculating a product of the target adjustment factor and a current current value of the target battery cluster to obtain the target adjustment current value; The adjustment method according to claim 11 .

13. The step of determining a target adjustment coefficient based on the current operating state and the charging rate difference includes: determining that the target adjustment coefficient is a first predetermined coefficient when the current working state of the battery system is charging and the charging rate difference is greater than 0; determining that the target adjustment coefficient is a second predetermined coefficient when the current working state of the battery system is charging and the charging rate difference is less than 0; determining that the target adjustment coefficient is a third predetermined coefficient when the current working state of the battery system is discharging and the charging rate difference is greater than 0; determining that the target adjustment coefficient is a fourth predetermined coefficient when the current working state of the battery system is discharging and the charging rate difference is less than 0; The first and fourth predetermined coefficients are less than 1, and the second and third predetermined coefficients are greater than 1. The adjustment method according to claim 12 .

14. Before disconnecting the parallel connection between the target battery cluster and other battery clusters, the adjustment method includes: Before the plurality of battery clusters are connected in parallel, obtaining a battery voltage of each battery cluster; determining a battery cluster whose battery voltage satisfies a predetermined parallel connection condition as a battery cluster that can be connected in parallel; and controlling a plurality of parallel-connectable battery clusters to be connected in parallel. The adjustment method according to any one of claims 6 to 8.

15. The step of determining a battery cluster whose battery voltage satisfies a predetermined parallel connection condition as a battery cluster that can be connected in parallel includes: determining all battery clusters in which a difference between a battery voltage and a target battery voltage is less than a first predetermined voltage threshold as battery clusters that can be connected in parallel; determining a candidate battery cluster that can be connected in parallel from battery clusters in which a difference between a battery voltage and a target battery voltage is greater than a first predetermined voltage threshold and less than a second predetermined voltage threshold; and controlling the first power converter to perform voltage compensation on the candidate parallel-connectable battery cluster so that the candidate parallel-connectable battery cluster becomes a parallel-connectable battery cluster. The adjustment method according to claim 14 .

16. The step of determining a candidate battery cluster that can be connected in parallel from battery clusters in which a difference between a battery voltage and a target battery voltage is greater than a first predetermined voltage threshold and less than a second predetermined voltage threshold, when the number of battery clusters in which the difference between the battery voltage and the target battery voltage is greater than a first predetermined voltage threshold and less than a second predetermined voltage threshold is one, determining the battery cluster in which the difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than a second predetermined voltage threshold as a candidate battery cluster that can be connected in parallel; and when there are a plurality of battery clusters in which the difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold, determining, as a candidate battery cluster that can be connected in parallel, a battery cluster in which the difference between the battery voltage and the target battery voltage is smallest among the plurality of battery clusters in which the difference between the battery voltage and the target battery voltage is greater than the first predetermined voltage threshold and less than the second predetermined voltage threshold. The adjustment method according to claim 15 .

17. An adjustment device, The regulating device is used in a regulating system connected to a battery system, the battery system including a plurality of battery clusters; A control module configured to control the target battery cluster to disconnect a parallel connection between the target battery cluster and other battery clusters and to electrically connect the target battery cluster to a first power conversion device; a transmitting module configured to transmit a target current command to the first power converter and cause the first power converter to make an adjustment to the target battery cluster based on the target current command. An adjustment device characterized by:

18. The present invention includes a memory and a processor, and a computer program is stored in the memory. When the computer program is executed by the processor, the adjustment method according to any one of claims 6 to 16 is realized.

1. An electronic device comprising:

19. 1. A computer-readable storage medium, comprising: A computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the adjustment method according to any one of claims 6 to 16 is realized. A computer-readable storage medium comprising:

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