Current control device of energy storage system, battery energy storage system and equalization control method

Abstract

The invention provides a current control device of an energy storage system, a battery energy storage system and an equalization control method, and relates to the technical field of energy storage. The current control device of the energy storage system comprises a current adjusting mechanism and a processing mechanism. The current adjusting mechanism is connected to the battery unit, and the current adjusting mechanism is provided with at least one current adjusting piece; the processing mechanism is connected to the current adjusting mechanism, and the processing mechanism responds to target current data and current state data of the battery unit, determines a target loop resistance value of the battery unit, and controls a current adjusting part of the current adjusting mechanism according to the target loop resistance value. The current control device of the energy storage system can improve the operation stability of the battery unit.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and more particularly, to a current control device for an energy storage system, a battery energy storage system, and an equalization control method. Background Art

[0002] With the increasing awareness of environmental protection and concerns about carbon emissions, the demand for the use of renewable energy is rising day by day. However, renewable energy is intermittent, which leads to an imbalance between the supply and demand of load power in the microgrid system. Therefore, an energy storage system can be connected to maintain the power balance of the system and improve the stability and reliability of the system.

[0003] Generally, droop control is often used in the control of energy storage systems to achieve current equalization between different battery units. However, this method can only make different battery units charge and discharge with the same charge and discharge power. When the original state of charge (SOC) of the battery units is different, charging and discharging with the same power will exacerbate the SOC imbalance and cannot ensure the SOC balance between the battery units, resulting in poor operating stability of the battery units. Summary of the Invention

[0004] The purpose of the present application is to provide a current control device for an energy storage system, a battery energy storage system, and an equalization control method, which can improve the operating stability of battery units.

[0005] In a first aspect, the present application provides a current control device for an energy storage system. The current control device includes a current adjustment mechanism and a processing mechanism, and the energy storage system includes battery units;

[0006] The current adjustment mechanism is connected to the battery units, and at least one current adjustment element is provided in the current adjustment mechanism;

[0007] The processing mechanism is connected to the current adjustment mechanism. The processing mechanism determines a target loop resistance value of the battery unit in response to target current data and current state data of the battery unit, and controls the current adjustment element of the current adjustment mechanism according to the target loop resistance value.

[0008] In the above implementation process, the current control device adds a current adjustment mechanism to the loop of the battery unit, adjusts the loop resistance of the battery unit through the current adjustment mechanism, and realizes the adjustment of the loop current of the battery unit; thus, the current control device can perform real-time adjustment based on the current difference and SOC difference of the battery unit, ensure the current consistency of each battery unit in the battery energy storage system, and at the same time reduce the SOC difference between each battery unit, improving the operating stability of the battery unit.

[0009] Further, the current control device further includes a current sensor, which is connected to the battery unit and used to obtain the current status data of the battery unit.

[0010] In the above implementation process, by setting a current sensor to obtain the current status of the battery unit, the current status data of the battery unit can be obtained.

[0011] Further, the current regulating component is a preset resistor, which is connected to the battery unit and used to regulate the loop resistance of the battery unit.

[0012] In the above implementation process, by changing the loop resistance in the battery unit through the preset resistor, the regulation of the loop current of the battery unit can be realized.

[0013] Further, the preset resistor is a variable resistor or a fixed resistor.

[0014] Further, if the preset resistor is a variable resistor, the locking method of the variable resistor is a sliding connection.

[0015] In the above implementation process, when the preset resistor is a variable resistor, the preset resistor can change the specific resistance value by sliding, so as to change the loop resistance in the battery unit, and further realize the regulation of the loop current of the battery unit.

[0016] Further, if the preset resistor is a fixed resistor, the locking method of the fixed resistor is a bolt connection or a snap connection.

[0017] In the above implementation process, when the preset resistor is a fixed resistor, the current regulating mechanism includes a plurality of fixed resistors. Therefore, the current regulating mechanism can realize the connection of different resistance values of fixed resistors to the battery unit loop by quickly changing the connection position of the resistors. The locking method of the fixed resistor can be a bolt connection or a snap connection in the form of quick insertion.

[0018] In a second aspect, the present application provides a battery energy storage system, including a battery pack and the current control device of the energy storage system according to any one of the first aspect;

[0019] The battery pack includes a plurality of parallel-connected battery units, and each battery unit is configured with one of the current control devices.

[0020] In a third aspect, the present application provides an equalization control method for a battery energy storage system, which is applied to the battery energy storage system according to the second aspect. The equalization control method includes:

[0021] Obtain the current status data of each battery unit in the battery pack and generate comprehensive current information;

[0022] Determine target current data based on the comprehensive current information;

[0023] Traverse each battery cell in the battery pack, and perform the following processing on the traversed battery cell:

[0024] In response to the current status data of the battery cell, determine the target loop resistance value of the battery cell according to the target current data and the preset resistance model, and control the current regulator of the current regulation mechanism according to the target loop resistance value.

[0025] Further, the step of determining target current data according to the comprehensive current information includes:

[0026] Perform an averaging process on the current status data of each battery cell in the battery pack to obtain average current data, and determine the target current data.

[0027] Further, the method further includes:

[0028] Obtain the SOC status data of each battery cell in the battery pack, and generate comprehensive SOC status data;

[0029] Determine target SOC data according to the comprehensive SOC status data;

[0030] Traverse each battery cell in the battery pack, and perform the following processing on the traversed battery cell:

[0031] In response to the target SOC data and the SOC status data of the battery cell, determine the charge and discharge time of the battery cell, and control the current regulator of the current regulation mechanism according to the target loop resistance value and the charge and discharge time.

[0032] In the above implementation process, the equalization control method can perform real-time adjustment based on the current difference and SOC difference of the battery cell 200, ensure the current consistency of each battery cell in the battery energy storage system, and at the same time reduce the SOC difference between each battery cell, improving the operation stability of the battery cell.

[0033] In a fourth aspect, an electronic device provided in the present application includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the method described in any item of the third aspect are implemented.

[0034] In a fifth aspect, a computer-readable storage medium provided in the present application stores instructions, and when the instructions run on a computer, the computer is caused to execute the method described in any item of the third aspect.

[0035] In a sixth aspect, a computer program product provided by the present application, when running on a computer, causes the computer to execute the method described in any one of the third aspects.

[0036] Other features and advantages disclosed in the present application will be described in the subsequent specification, or some features and advantages can be inferred from the specification or determined without doubt, or can be learned by implementing the above technologies disclosed in the present application.

[0037] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is a schematic structural diagram of a current control device for an energy storage system provided by an embodiment of the present application;

[0040] Figure 2 It is a schematic structural diagram of a battery energy storage system provided by an embodiment of the present application;

[0041] Figure 3 It is a schematic flowchart of an equalization control method for a battery energy storage system provided by an embodiment of the present application;

[0042] Figure 4 It is a structural block diagram of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the drawings in the embodiments of the present application.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0045] Generally, droop control is commonly used in the control of battery energy storage systems to achieve current balance among different battery units. However, this method can only make different battery units charge and discharge with the same charge-discharge power. When the original state of charge (SOC) of the battery units is different, charging and discharging with the same power will exacerbate the SOC imbalance and cannot ensure the SOC balance among the battery units. There are application situations and existing technical problems in existing energy storage systems:

[0046] 1. Judge the SOC difference among battery units based on the state of charge of the battery units. The accuracy of SOC state estimation itself is relatively low, generally with a difference of 5% currently, so it is prone to false balancing;

[0047] 2. Since the uneven current distribution among battery units causes SOC differences, the root cause of the SOC differences is not fundamentally solved;

[0048] 3. During the balancing operation, it will cause the energy storage power station to be unable to operate normally.

[0049] For conventional electrochemical energy storage solutions, in order to reduce the basic investment of the energy storage power station, a scheme of connecting multiple energy storage battery units (Racks) in parallel is generally adopted. However, due to the differences in the internal resistance of the batteries in each battery unit and the differences in the lengths of the external connection cables, the internal resistances of each energy storage battery unit are different. According to Ohm's law, when the voltage is the same, there will also be differences in the charge-discharge currents of each energy storage battery unit. In severe cases, the current difference between each unit will be too large to trigger the system alarm threshold and even cut off the circuit, affecting the normal operation of the energy storage power station.

[0050] To solve the above-mentioned technical problems, the embodiments of the present application provide a current control device, a battery energy storage system and a control method for an energy storage system. An current adjustment mechanism is added to the circuit of the battery unit. The current control device can perform real-time adjustment based on the current difference and SOC difference of the battery unit, ensure the current consistency of each battery unit in the battery energy storage system, and at the same time reduce the SOC difference among each battery unit.

[0051] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the current control device for the energy storage system provided by the embodiment of the present application. The current control device for the energy storage system includes an current adjustment mechanism 100 and a processing mechanism;

[0052] Exemplarily, the current adjustment mechanism 100 is connected to the battery unit 200, and the current adjustment mechanism 100 is provided with at least one current adjustment component;

[0053] In some embodiments, the current regulation mechanism 100 is provided with at least one current regulating component. Through this current regulating component, the resistance in the circuit of the battery unit 200 can be changed, thereby changing the current of the battery unit 200. Optionally, the current regulating component can be an electronic component with a certain resistance value.

[0054] Exemplarily, the battery unit 200 can be a battery cluster or a battery cell, etc. When the battery unit 200 is a battery cluster, the battery unit 200 is composed of one or more battery cells in series and parallel.

[0055] It should be noted that the current regulating component in the circuit of the battery unit 200 can be a resistor or other ways to change the resistance in the circuit. This is only an example here and not a limitation.

[0056] Exemplarily, the processing mechanism is connected to the current regulation mechanism 100. The processing mechanism determines the target circuit resistance value of the battery unit 200 in response to the target current data and the current status data of the battery unit 200, and controls the current regulating component of the current regulation mechanism 100 according to the target circuit resistance value.

[0057] Exemplarily, the target current data obtained by the processing mechanism can be the average current of each battery unit 200 in the battery energy storage system, or a current value determined after comprehensive calculation and processing based on the current values and SOC states of each battery unit 200 in the battery energy storage system. For example, the current values of each battery unit 200 are respectively denoted as I1, I2,..., In, and the SOC states of each battery unit 200 are denoted as S1, S2,..., Sn. Then, the mean value is calculated according to I1, I2,..., In to obtain I 平均 Then, the mean value is calculated according to S1, S2,..., Sn to obtain S 平均 Then, according to the formula I 目标 = I 平均 + k × S 平均 The target current data I is obtained. 目标 where k is a preset conversion coefficient.

[0058] Exemplarily, after the current of the current unit 200 reaches the target current data, the current consistency of each battery unit 200 in the battery energy storage system can be ensured, or the SOC difference between each battery unit 200 can be reduced.

[0059] Exemplarily, in response to the target current data and the current state data of the battery cell 200, the processing mechanism may determine the expected resistance value after reaching the target current data in the circuit of the battery cell 200, that is, the target circuit resistance value, according to the difference between the current state data of the battery cell 200 and the target current data; in some embodiments, when the current state data of the battery cell 200 is inconsistent with the target current data, the target circuit resistance value may be determined according to the following formula:

[0060] R 目标 =U / I 目标 ;

[0061] where U is the voltage value of the battery cell 200, I 目标 is the target current data, and R 目标 is the target circuit resistance value; thus, the current regulating member of the current regulating mechanism 100 is controlled according to the target circuit resistance value to adjust the circuit resistance of the battery cell 200 so that the circuit current of the battery cell 200 reaches the target current data.

[0062] In some embodiments, the current control device adjusts the circuit current of the battery cell 200 by adding a current regulating mechanism to the circuit of the battery cell and adjusting the circuit resistance of the battery cell 200 through the current regulating mechanism; thus, the current control device can perform real-time adjustment based on the current difference and SOC difference of the battery cell 200 to ensure the current consistency of each battery cell in the battery energy storage system, while reducing the SOC difference between each battery cell and improving the operating stability of the battery cell.

[0063] Optionally, the specific form of the battery cell 200 may have various forms such as series and / or parallel, which is not limited herein.

[0064] Exemplarily, the current control device further includes a current sensor 110. The current sensor 110 is connected to the battery cell 200 and is used to obtain the current state data of the battery cell 200; by setting the current sensor 110 to obtain the current state of the battery cell 200, the current state data of the battery cell 200 can be obtained.

[0065] Exemplarily, the current regulating member is a preset resistor. The preset resistor is connected to the battery cell 200 and is used to adjust the circuit resistance of the battery cell 200;

[0066] In some embodiments, the circuit resistance in the battery cell 200 is changed by the preset resistor, thereby realizing the adjustment of the circuit current of the battery cell 200.

[0067] Exemplarily, the preset resistor is a variable resistor or a fixed resistor.

[0068] Exemplarily, if the preset resistor is a variable resistor, the locking method of the variable resistor is a sliding connection.

[0069] Exemplarily, when the preset resistor is a variable resistor, the preset resistor can change the specific resistance value by sliding, thereby changing the loop resistance in the battery unit 200, and further realizing the regulation of the loop current of the battery unit 200.

[0070] Exemplarily, if the preset resistor is a fixed resistor, the locking method of the fixed resistor is a bolt connection or a snap connection.

[0071] Exemplarily, when the preset resistor is a fixed resistor, the current regulating mechanism includes a plurality of fixed resistors. Thus, the current regulating mechanism can realize the connection of fixed resistors with different resistance values to the battery unit 200 loop by quickly changing the position of resistor connection. The locking method of the fixed resistor can be a bolt connection or a snap connection in the form of quick insertion.

[0072] In some implementation scenarios, as Figure 1 shown, a fuse FU1 and a fuse FU2 are respectively connected to both ends of the battery unit 200. By setting the fuse FU1 and the fuse FU2, it is ensured that the battery unit 200 will not be damaged due to overcurrent; among them, Figure 1 the B- shown is the negative electrode of the battery, and B+ is the positive electrode of the battery.

[0073] Optionally, the current control device is further provided with a plurality of relays, such as relay K1, relay K2, and relay K3, to realize the on-off control of the loop of the battery unit 200 by setting the relays.

[0074] In some embodiments, the current regulating mechanism 100 can be located at any position in the loop of the battery unit 200; for example, if the battery unit 200 is integrated in an electrical box, the current regulating mechanism 100 can be inside the electrical box, outside the electrical box, inside or outside the main control box / high-voltage box, and at connection positions such as cables.

[0075] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the battery energy storage system provided by the embodiment of the present application;

[0076] Exemplarily, the present application provides a battery energy storage system, including a battery pack 20 and Figure 1 the current control device of the energy storage system as shown; among them, the battery pack 20 includes a plurality of parallel-connected battery units 200, and each battery unit 200 is configured with a current control device.

[0077] In some embodiments, the battery energy storage system is further provided with a power conversion system (PCS) 300; the PCS can control the charging and discharging processes of the storage battery, perform AC-DC conversion, and directly supply power to AC loads in the absence of a power grid.

[0078] Please refer to Figure 3 , Figure 3 which is a schematic flowchart of an equalization control method for a battery energy storage system provided by an embodiment of the present application. This equalization control method for a battery energy storage system is applied to Figure 2 the battery energy storage system shown in the figure, and the equalization control method includes the following steps:

[0079] S100: Obtain the current state data of each battery cell in the battery pack and generate comprehensive current information;

[0080] Exemplarily, the battery cells 200 in the battery pack are connected in parallel, and the loop currents of each battery cell 200 are independent of each other;

[0081] S200: Determine the target current data according to the comprehensive current information;

[0082] Exemplarily, after obtaining the current state data of each battery cell 200 in the battery pack, the target current data can be determined according to the average value of the current state data of all battery cells 200, or it can be the expected current value obtained by processing the current state data of all battery cells 200 according to a preset algorithm model (for example, the weighted average algorithm). This is only an example here and not a limitation;

[0083] In some embodiments, the target current data can be determined according to the minimum adjustment state; for example, after determining the target current data, the battery energy storage system needs to adjust each battery cell 200 according to the target current data. At this time, the adjustment actions or adjustment amounts of the battery cells can be counted. If the adjustment action is the smallest or the adjustment amount is the smallest, it means that the target current data corresponds to the minimum adjustment state.

[0084] S300: Traverse each battery cell in the battery pack and perform the following processing on the traversed battery cell: In response to the current state data of the battery cell, determine the target loop resistance value of the battery cell according to the target current data and the preset resistance model, and control the current adjustment member of the current adjustment mechanism according to the target loop resistance value.

[0085] Exemplarily, the battery energy storage system provided by the embodiments of the present application can obtain the current status of each battery cell 200 through a current sensor. When uneven current occurs in each battery cell, based on the formula I = U / R, it can be known that the loop current value can be changed by adjusting the resistance, that is, the resistance in the loop is adjusted by changing the hardware;

[0086] In some embodiments, the battery energy storage system is provided with a BMS (Battery Management System), and the current adjustment mechanism of each battery cell 200 is connected through the BMS; optionally, the processing mechanism in the current adjustment mechanism of each battery cell 200 can be connected to the BMS or integrated in the BMS. This is only an example here and not a limitation;

[0087] In some embodiments, when there are differences in the currents of each battery cell 200, the processor inside the BMS calculates the resistance value that needs to be replaced for a specific battery cell 200, so as to control the current adjustment mechanism to achieve resistance replacement;

[0088] Exemplarily, the equalization control method further includes:

[0089] Obtain the SOC status data of each battery cell in the battery pack to generate comprehensive SOC status data;

[0090] Determine the target SOC data according to the comprehensive SOC status data;

[0091] Traverse each battery cell in the battery pack and perform the following processing on the traversed battery cell:

[0092] In response to the target SOC data and the SOC status data of the battery cell, determine the charge and discharge time of the battery cell, and control the current adjustment component of the current adjustment mechanism according to the target loop resistance value and the charge and discharge time.

[0093] Exemplarily, the equalization control method can perform real-time adjustment based on the current difference and SOC difference of the battery cell 200, ensure the current consistency of each battery cell in the battery energy storage system, and at the same time reduce the SOC difference between each battery cell, improving the operation stability of the battery cell.

[0094] In some implementation scenarios, the specific implementation steps of the equalization control method provided by the embodiments of the present application are exemplified as follows:

[0095] S1: Obtain the current status data of each battery cell 200 in the battery pack; for example, if the battery pack includes N battery cells 200, then N current status data I 1 、I 2 ……、I N ;

[0096] Based on multiple N current state data I 1 、I 2 ……、I N , generate the comprehensive current information of the battery energy storage system;

[0097] S2: Process the N current state data I 1 、I 2 ……、I N according to a preset algorithm model to obtain target current data; Here, taking the current average value as an example (it can also be a weighted average value, and the weighting coefficient is determined according to the SOC state data), calculate the target current data:

[0098] I 目标 =(I 1 +I 2 +……+I N ) / N;

[0099] S3: Traverse each battery cell 200 in the battery pack, and perform the following processing on the traversed battery cell 200:

[0100] Record the current state data corresponding to the traversed battery cell 200 as I i , at this time, according to the difference between I i and I 目标 , based on the formula I = U / R, it can be known that adjusting the resistance R can achieve current adjustment under the condition of constant voltage U. Determine the target loop resistance value of the battery cell 200, and then control the current adjustment component of the current adjustment mechanism 100 according to the target loop resistance value, so as to adjust the loop resistance of the battery cell 200 so that the loop current of the battery cell 200 reaches I 目标 .

[0101] In some embodiments, the SOC state adjustment of the battery cell 200 is the same as the current adjustment, which will not be elaborated here.

[0102] This application embodiment also provides an electronic device, please refer to Figure 4 , Figure 4 is the structural block diagram of an electronic device provided by this application embodiment. The electronic device may include a processor 510, a communication interface 520, a memory 530, and at least one communication bus 540. Among them, the communication bus 540 is used to realize the direct connection communication of these components. Among them, the communication interface 520 of the electronic device in this application embodiment is used to communicate with other node devices for signaling or data. The processor 510 may be an integrated circuit chip with signal processing capabilities.

[0103] The above-mentioned processor 510 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor, or the processor 510 may also be any conventional processor, etc.

[0104] The memory 530 may be, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc. Computer-readable instructions are stored in the memory 530. When the computer-readable instructions are executed by the processor 510, the electronic device can execute the Figure 3 various steps involved in the method embodiments.

[0105] Optionally, the electronic device may further include a storage controller and an input / output unit.

[0106] The memory 530, the storage controller, the processor 510, the peripheral interface, and the input / output unit are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses 540. The processor 510 is used to execute the executable modules stored in the memory 530, such as software function modules or computer programs included in the electronic device.

[0107] The input / output unit is used to provide the user with the creation of tasks and the creation of a start optional period or a preset execution time for the task to achieve the interaction between the user and the server. The input / output unit may be, but is not limited to, a mouse, a keyboard, etc.

[0108] It can be understood that Figure 4 the structure shown is only schematic, and the electronic device may further include more or fewer components than Figure 4 those shown, or have the same asFigure 4 The different configurations shown. Figure 4 Each component shown in can be implemented by hardware, software, or a combination thereof.

[0109] The embodiments of the present application also provide a storage medium, on which instructions are stored. When the instructions run on a computer, the computer program, when executed by a processor, implements the method described in the method embodiments. To avoid repetition, it will not be elaborated here.

[0110] The present application also provides a computer program product. When the computer program product runs on a computer, it causes the computer to execute the method described in the method embodiments.

[0111] In several embodiments provided by the present application, it should be understood that the disclosed apparatus and method can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the drawings show the possible architectures, functions, and operations of apparatuses, methods, and computer program products according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order from that marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0112] In addition, in each embodiment of the present application, the various functional modules can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0113] When the above-mentioned functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0114] The above are only the embodiments of this application and are not used to limit the protection scope of this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0115] As mentioned above, these are only the specific implementation manners of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0116] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitations, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. An apparatus for controlling the current of an energy storage system, characterized in that, the current control apparatus includes a current adjustment mechanism and a processing mechanism, and the energy storage system includes a battery unit; the current adjustment mechanism is connected to the battery unit, and the current adjustment mechanism is provided with at least one current adjustment component; the processing mechanism is connected to the current adjustment mechanism, and the processing mechanism determines a target loop resistance value of the battery unit in response to target current data and current state data of the battery unit, and controls the current adjustment component of the current adjustment mechanism according to the target loop resistance value.

2. The apparatus for controlling the current of an energy storage system according to claim 1, characterized in that, the current control apparatus further includes a current sensor, and the current sensor is connected to the battery unit for acquiring the current state data of the battery unit.

3. The apparatus for controlling the current of an energy storage system according to claim 1, characterized in that, the current adjustment component is a preset resistor, and the preset resistor is connected to the battery unit for adjusting the loop resistance of the battery unit.

4. The apparatus for controlling the current of an energy storage system according to claim 3, characterized in that, the preset resistor is a variable resistor or a fixed resistor.

5. The apparatus for controlling the current of an energy storage system according to claim 4, characterized in that, the preset resistor is a variable resistor, and the locking method of the variable resistor is a sliding connection.

6. The apparatus for controlling the current of an energy storage system according to claim 4, characterized in that, the preset resistor is a fixed resistor, and the locking method of the fixed resistor is a bolt connection or a snap connection.

7. A battery energy storage system, characterized in that, comprising a battery pack and the apparatus for controlling the current of an energy storage system according to any one of claims 1 to 6; the battery pack includes a plurality of parallel-connected battery units, and each of the battery units is configured with one of the current control apparatuses.

8. An equalization control method for a battery energy storage system, characterized in that, applied to the battery energy storage system according to claim 7, the equalization control method includes: acquiring the current state data of each battery unit in the battery pack to generate comprehensive current information; determining target current data according to the comprehensive current information; traversing each battery unit in the battery pack, and performing the following processing on the traversed battery unit: responding to the current state data of the battery unit, determining the target loop resistance value of the battery unit according to the target current data and a preset resistance model, and controlling the current adjustment component of the current adjustment mechanism according to the target loop resistance value.

9. The equalization control method for a battery energy storage system according to claim 8, characterized in that, the step of determining target current data according to the comprehensive current information includes: performing an averaging process on the current state data of each battery unit in the battery pack to obtain current average value data, and determining the target current data.

10. The equalization control method for a battery energy storage system according to claim 8, characterized in that, the method further includes: Obtain the SOC status data of each battery cell in the battery pack and generate comprehensive SOC status data; Determine the target SOC data according to the comprehensive SOC status data; Traverse each battery cell in the battery pack and perform the following processing on the traversed battery cell: In response to the target SOC data and the SOC status data of the battery cell, determine the charge and discharge time of the battery cell, and control the current regulator of the current regulation mechanism according to the target loop resistance value and the charge and discharge time.

11. An electronic device, Characterized in that, Comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the equalization control method of the battery energy storage system according to any one of claims 8 to 10 are implemented.

12. A computer-readable storage medium, Characterized in that, Instructions are stored on the computer-readable storage medium, and when the instructions are run on a computer, the computer is caused to execute the equalization control method of the battery energy storage system according to any one of claims 8 to 10.

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