A design method and device for digital energy storage system and digital energy storage system

Abstract

The present invention discloses a design method and device of a digital energy storage system and a digital energy storage system. The digital energy storage system includes a digital energy storage subsystem, the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell. Based on the rated total power and rated total capacity of the digital energy storage system, the rated sub-power and rated sub-capacity of the digital energy storage subsystem are determined. Based on the rated capacity and rated sub-capacity of the battery cells, the number of parallel battery modules of the parallel battery modules in the dynamic reconfigurable battery network is determined. Based on the rated voltage, rated current, number of series-connected battery cells of the battery module, number of parallel battery modules and rated sub-power of the battery cells, the number of series-connected battery modules of the parallel battery modules in the dynamic reconfigurable battery network is determined. Compared with the prior art, the technical solution of the present invention can improve the safety and reliability of the battery network.

Description

Technical Field

[0001] The present application relates to the technical field of battery energy storage system design, and in particular to a design method and device for a digital energy storage system and a digital energy storage system. Background Art

[0002] Energy storage technology plays a vital role in modern energy systems. By achieving rapid dynamic matching between power generation curves and load curves, energy storage systems can smooth fluctuations, match supply and demand, and reduce peaks and fill valleys, thereby improving power supply quality. These functions make energy storage a core device for building an energy Internet. However, with the rapid development of energy storage technology, its problems in terms of safety and economy have become increasingly prominent.

[0003] In terms of safety, faced with surging market demand and complex application scenarios, energy storage safety accidents frequently occur around the world, including projects involving some well-known energy storage suppliers. The expansion of the integration scale of energy storage systems and the doubling of the number of battery products and electrical equipment have increased the potential dangers of quality problems. In addition, the increase in the number and levels of series and parallel batteries has led to a more complex combination of electrical and power electronics, increasing the difficulty of ensuring the safety of energy storage systems. It is no longer possible to substantially improve the safety of energy storage systems by simply stacking devices and traditional firefighting tools. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a design method and device for a digital energy storage system and a digital energy storage system, which can improve the safety and reliability of the battery network.

[0005] In order to solve the above technical problems, the present application provides a design method of a digital energy storage system, including:

[0006] The digital energy storage system includes a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell;

[0007] Acquire the rated total power and the rated total capacity of the digital energy storage system, and determine the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity;

[0008] Acquire a battery rated capacity corresponding to the battery cell, and determine the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity;

[0009] The battery rated voltage and the battery rated current corresponding to the battery cell are obtained, and the number of series-connected battery cells corresponding to the battery module is obtained, and the number of series-connected battery modules in the dynamically reconfigurable battery network is determined based on the battery rated voltage, the battery rated current, the number of series-connected battery cells, the number of parallel-connected battery modules and the rated sub-power.

[0010] In a possible implementation, the dynamically reconfigurable battery network further includes a power electronic switch;

[0011] The power electronic switch is connected in series with the battery module in the dynamically reconfigurable battery network;

[0012] Determine the module rated voltage of the battery module based on the battery rated voltage corresponding to the battery cell and the number of battery cells connected in series, and determine the switch rated voltage of the power electronic switch based on the module rated voltage;

[0013] The module rated current of the battery module is determined based on the battery rated current corresponding to the battery cell.

[0014] In a possible implementation, the digital energy storage subsystem further includes a power conversion system;

[0015] The power conversion system is connected to the dynamically reconfigurable battery network;

[0016] Obtaining a discharge cut-off voltage corresponding to a battery cell, and determining a DC side voltage lower limit of the power conversion system based on the discharge cut-off voltage, the number of the series-connected battery cells, and the number of the parallel-connected battery modules;

[0017] The charging cut-off voltage corresponding to the battery cell is obtained, and based on the charging cut-off voltage, the number of the series-connected battery cells and the number of the parallel-connected battery modules, the upper limit of the DC side voltage of the power conversion system is determined.

[0018] In a possible implementation, based on the rated total power and the rated total capacity, determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system specifically includes:

[0019] Obtain the number of subsystems of the digital energy storage subsystem in the digital energy storage system, substitute the number of subsystems, the rated total power and the rated total capacity into a preset digital energy storage subsystem parameter calculation formula, and obtain the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem, wherein the digital energy storage subsystem parameter calculation formula is as follows:

[0020] ;

[0021] in, is the rated sub-power, is the rated sub-capacity, is the rated total power, is the rated total capacity, is the number of subsystems.

[0022] The present application provides a design method for a digital energy storage system, further comprising:

[0023] The rated sub-power corresponding to the digital energy storage subsystem is set to the battery network rated power corresponding to the dynamically reconfigurable battery network, and the rated sub-capacity corresponding to the digital energy storage subsystem is set to the battery network rated capacity corresponding to the dynamically reconfigurable battery network.

[0024] In a possible implementation, determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity specifically includes:

[0025] The battery rated capacity and the rated sub-capacity are input into a preset parallel battery module quantity calculation formula to obtain the parallel battery module quantity of the parallel battery modules in the dynamically reconfigurable battery network, wherein the parallel battery module quantity calculation formula is as follows:

[0026] ;

[0027] in, is the number of parallel battery modules, is the rated sub-capacity, is the rated capacity of the battery.

[0028] In a possible implementation, based on the battery rated voltage, the battery rated current, the number of battery cells connected in series, the number of battery modules connected in parallel, and the rated sub-power, determining the number of battery modules connected in series in the dynamically reconfigurable battery network specifically includes:

[0029] Substitute the battery rated voltage, the battery rated current, the number of battery cells connected in series, the number of battery modules connected in parallel and the rated sub-power into a preset series battery module number calculation formula to obtain the number of series battery modules of parallel battery modules in the dynamically reconfigurable battery network, wherein the series battery module number calculation formula is as follows:

[0030] ;

[0031] In the formula, is the number of battery cells connected in series, is the number of battery modules connected in series, is the rated voltage of the battery, is the battery rated current, is the number of parallel battery modules, is the rated sub-power.

[0032] The present application also provides a design device for a digital energy storage system, comprising: a system setting module, a subsystem parameter setting module, a parallel battery module quantity determination module, and a series battery module quantity determination module;

[0033] Wherein, the system setting module is used to set the digital energy storage system to include a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell;

[0034] The subsystem parameter setting module is used to obtain the rated total power and the rated total capacity of the digital energy storage system, and determine the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity;

[0035] The parallel battery module quantity determination module is used to obtain the battery rated capacity corresponding to the battery monomer, and determine the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity;

[0036] The module for determining the number of series battery modules is used to obtain the battery rated voltage and the battery rated current corresponding to the battery cell, and at the same time obtain the number of series battery cells corresponding to the battery module, and determine the number of series battery modules of the series battery modules in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series battery cells, the number of parallel battery modules and the rated sub-power.

[0037] The present application provides a design device for a digital energy storage system, further comprising: a power electronic switch parameter setting module;

[0038] The dynamically reconfigurable battery network also includes a power electronic switch;

[0039] The power electronic switch is connected in series with the battery module in the dynamically reconfigurable battery network;

[0040] The power electronic switch parameter setting module is used to determine the module rated voltage of the battery module based on the battery rated voltage corresponding to the battery cell and the number of battery cells connected in series, and to determine the switch rated voltage of the power electronic switch based on the module rated voltage, and to determine the module rated current of the battery module based on the battery rated current corresponding to the battery cell.

[0041] The present application provides a design device for a digital energy storage system, further comprising: a power conversion system parameter setting module;

[0042] The digital energy storage subsystem also includes a power conversion system;

[0043] The power conversion system is connected to the dynamically reconfigurable battery network;

[0044] Among them, the power conversion system parameter setting module is used to obtain the discharge cut-off voltage corresponding to the battery cell, determine the lower limit of the DC side voltage of the power conversion system based on the discharge cut-off voltage, the number of battery cells in series and the number of battery modules in parallel, obtain the charging cut-off voltage corresponding to the battery cell, and determine the upper limit of the DC side voltage of the power conversion system based on the charging cut-off voltage, the number of battery cells in series and the number of battery modules in parallel.

[0045] In a possible implementation, the subsystem parameter setting module is used to determine the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity, specifically including:

[0046] Obtain the number of subsystems of the digital energy storage subsystem in the digital energy storage system, substitute the number of subsystems, the rated total power and the rated total capacity into a preset digital energy storage subsystem parameter calculation formula, and obtain the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem, wherein the digital energy storage subsystem parameter calculation formula is as follows:

[0047] ;

[0048] in, is the rated sub-power, is the rated sub-capacity, is the rated total power, is the rated total capacity, is the number of subsystems.

[0049] The present application provides a design device for a digital energy storage system, further comprising: the dynamically reconfigurable battery network parameter setting module;

[0050] Among them, the dynamically reconfigurable battery network parameter setting module is used to set the rated sub-power corresponding to the digital energy storage subsystem to the battery network rated power corresponding to the dynamically reconfigurable battery network, and set the rated sub-capacity corresponding to the digital energy storage subsystem to the battery network rated capacity corresponding to the dynamically reconfigurable battery network.

[0051] In a possible implementation, the parallel battery module quantity determination module is used to determine the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity, specifically including:

[0052] The battery rated capacity and the rated sub-capacity are input into a preset parallel battery module quantity calculation formula to obtain the parallel battery module quantity of the parallel battery modules in the dynamically reconfigurable battery network, wherein the parallel battery module quantity calculation formula is as follows:

[0053] ;

[0054] in, is the number of parallel battery modules, is the rated sub-capacity, is the rated capacity of the battery.

[0055] In a possible implementation, the module for determining the number of series-connected battery modules is used to determine the number of series-connected battery modules in the dynamically reconfigurable battery network based on the rated voltage of the battery, the rated current of the battery, the number of series-connected battery cells, the number of parallel-connected battery modules, and the rated sub-power, and specifically includes:

[0056] Substitute the battery rated voltage, the battery rated current, the number of battery cells connected in series, the number of battery modules connected in parallel and the rated sub-power into a preset series battery module number calculation formula to obtain the number of series battery modules of parallel battery modules in the dynamically reconfigurable battery network, wherein the series battery module number calculation formula is as follows:

[0057] ;

[0058] In the formula, is the number of battery cells connected in series, is the number of battery modules connected in series, is the rated voltage of the battery, is the battery rated current, is the number of parallel battery modules, is the rated sub-power.

[0059] The present application also provides a digital energy storage system, including a digital energy storage subsystem, the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell;

[0060] The method for determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem includes: obtaining the rated total power and rated total capacity of the digital energy storage system, and determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity;

[0061] The method for determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network comprises: obtaining the battery rated capacity corresponding to the battery cell, and determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity;

[0062] The method for determining the number of series-connected battery modules in the dynamically reconfigurable battery network includes: obtaining the battery rated voltage and the battery rated current corresponding to the battery cell, and simultaneously obtaining the number of series-connected battery cells corresponding to the battery module, and determining the number of series-connected battery modules in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series-connected battery cells, the number of parallel battery modules and the rated sub-power.

[0063] The present application also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the design method of the digital energy storage system as described in any one of the above.

[0064] The design method, device, equipment and storage medium of a digital energy storage system in the embodiment of the present application have the following beneficial effects compared with the prior art:

[0065] By setting up a digital energy storage system including a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell; obtaining the rated total power and the rated total capacity of the digital energy storage system, and based on the rated total power and the rated total capacity, determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system; obtaining the battery rated capacity corresponding to the battery cell, and based on the battery rated capacity and the rated sub-capacity, determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network; obtaining the battery rated voltage and the battery rated current corresponding to the battery cell, and at the same time obtaining the number of series battery cells corresponding to the battery module, and based on the battery rated voltage , the battery rated current, the number of battery cells in series, the number of battery modules in parallel and the rated sub-power, to determine the number of battery modules in series in the dynamically reconfigurable battery network; compared with the prior art, the technical solution of the present invention introduces the dynamic reconfigurable battery network into the architecture of the digital energy storage system, transforms the traditional analog battery energy storage system into a digital battery energy storage system, thereby improving the efficiency and safety of the battery network; at the same time, the rated total power and total capacity of the digital energy storage system and the relevant data of the battery cells are obtained to accurately calculate the rated sub-power and sub-capacity of the digital energy storage subsystem, as well as the number of battery modules in parallel and the number of battery modules in series in the dynamically reconfigurable battery network, thereby ensuring that the operating status of the digital energy storage system is always within the design range, thereby improving the safety and reliability of the battery network. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 It is a flow chart of an embodiment of a design method of a digital energy storage system provided by the present application;

[0067] Figure 2 It is a structural schematic diagram of an embodiment of a design device for a digital energy storage system provided by the present application;

[0068] Figure 3 It is a structural schematic diagram of a digital energy storage subsystem of an embodiment provided by the present application;

[0069] Figure 4 It is a schematic diagram of the architecture of a digital energy storage system according to an embodiment of the present application;

[0070] Figure 5 is a schematic diagram of the architecture of a dynamically reconfigurable battery network according to an embodiment of the present application;

[0071] Figure 6 is a schematic structural diagram of a battery module of an embodiment provided by the present application;

[0072] Figure 7 It is a structural schematic diagram of a terminal device provided by the present invention. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0074] Example 1, see Figure 1 , Figure 1 is a flow chart of an embodiment of a design method for a digital energy storage system provided by the present application, such as Figure 1 As shown, the method includes steps 101 to 104, which are specifically as follows:

[0075] Step 101: Setting a digital energy storage system includes a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell.

[0076] In one embodiment, the digital energy storage subsystem includes a reconfigurable battery network, a power conversion system PCS and a transformer; wherein the reconfigurable battery network is connected to a first end of the power conversion system PCS, a second end of the power conversion system is connected to a first end of the transformer, and a second end of the transformer is connected to the grid, such as Figure 3 As shown, Figure 3 It is a structural diagram of the digital energy storage subsystem.

[0077] Preferably, the DC output of the reconfigurable battery network is inverted into a low-voltage AC output through the power conversion system PCS, and the low-voltage AC output of the power conversion system PCS is connected to the grid through a transformer, and the grid voltage is 35kV AC. The transformer can achieve isolation between the high-voltage side and the low-voltage side, so that the battery network is always at a low potential. Since the battery itself has strong uncertainty and safety hazards, if the battery network is at a high potential, it may cause a series of problems such as insulation, overvoltage, overcurrent, and overheating, endangering the safe operation of the energy storage system; therefore, the digital energy storage system not only realizes the conversion of electric energy through the cooperation of the power conversion system PCS and the transformer, but also improves the safety of the energy storage system.

[0078] In one embodiment, in order to improve the power capacity of the digital energy storage system, the digital energy storage system includes a plurality of digital energy storage subsystems, and the plurality of digital energy storage subsystems are connected to the grid through a transformer to form the digital energy storage system, such as Figure 4 As shown, Figure 4It is a schematic diagram of the architecture of the digital energy storage system.

[0079] In one embodiment, the dynamically reconfigurable battery network includes a plurality of battery modules, wherein a plurality of battery modules are connected in series to construct a series battery module, and a plurality of battery modules are connected in parallel to construct a parallel battery module.

[0080] In one embodiment, the dynamically reconfigurable battery network also includes a power electronic switch, which is connected in series with each battery module in the dynamically reconfigurable battery network, and the power electronic switch controls whether the battery module connected in series with the power electronic switch is connected to the dynamically reconfigurable battery network.

[0081] Preferably, the architecture of the dynamically reconfigurable battery network is constructed by N parallel battery modules and M series battery modules, the N battery modules can be reconfigured in parallel to increase the maximum rated current of the dynamically reconfigurable battery network, and the M battery modules are connected in series to provide sufficient DC output voltage; Figure 5 As shown, Figure 5 It is a schematic diagram of the architecture of a dynamically reconfigurable battery network.

[0082] In one embodiment, the dynamically reconfigurable battery network realizes adaptive reconstruction of the network connection mode by turning on and off the power electronic switches, so that the output of the battery network matches the demand of the load, while ensuring the safe and reliable operation of the battery network.

[0083] In one embodiment, the battery module includes a plurality of battery cells, and the plurality of battery cells are connected in series to form the battery module, so as to realize the storage and supply of electric energy; Figure 6 As shown, Figure 6 It is a structural diagram of the battery module.

[0084] In one embodiment, since the capacity, voltage and current corresponding to a single battery module are small and cannot meet the needs of the entire battery network, in this embodiment, multiple battery modules are formed into a dynamic reconfigurable battery network by means of N parallel battery modules and M series battery modules; wherein the dynamic reconfigurable battery network is the core of the digital energy storage system, and the reconfigurable connection of the dynamic reconfigurable battery network is realized by coupling the battery module with a low-power power electronic switch, so that the dynamic reconfigurable battery network can dynamically change the connection mode between the battery modules during the charging and discharging process of the digital energy storage system, which is the basis for realizing the safe, reliable and efficient operation of the DC battery network; at the same time, in order to realize the energy and power output of the dynamic reconfigurable battery network, it is necessary to coordinate the dynamic reconfigurable battery network with the power conversion system PCS, transformer and other equipment to form a digital energy storage system; the main function of the digital energy storage system is to realize the grid-connected operation of the dynamic reconfigurable battery network and coordinate the output of different digital energy storage subsystems to ensure the reliability and efficiency of the system operation.

[0085] Step 102: Acquire the rated total power and rated total capacity of the digital energy storage system, and determine the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity.

[0086] In one embodiment, the rated total power and the rated total capacity of the digital energy storage system to be involved are obtained, wherein the rated total power and the rated total capacity are known overall design goals of the digital energy storage system and can be directly obtained.

[0087] In one embodiment, the number of subsystems of the digital energy storage subsystem in the digital energy storage system is obtained, and the number of subsystems, the rated total power, and the rated total capacity are substituted into a preset digital energy storage subsystem parameter calculation formula to obtain the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem, wherein the digital energy storage subsystem parameter calculation formula is as follows:

[0088] ;

[0089] in, is the rated sub-power, is the rated sub-capacity, is the rated total power, is the rated total capacity, is the number of subsystems.

[0090] Step 103: Obtain the battery rated capacity corresponding to the battery cell, and determine the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity.

[0091] In one embodiment, based on the structural example diagram of the digital energy storage subsystem, it can be seen that when the losses of the transformer and the power conversion system PCS are ignored, the battery network rated power and the battery network rated capacity corresponding to the dynamically reconfigurable battery network are the same as the rated sub-power and the rated sub-capacity corresponding to the digital energy storage subsystem; therefore, after determining the rated sub-power and the rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system, the rated sub-power corresponding to the digital energy storage subsystem is also set to the battery network rated power corresponding to the dynamically reconfigurable battery network, and the rated sub-capacity corresponding to the digital energy storage subsystem is set to the battery network rated capacity corresponding to the dynamically reconfigurable battery network.

[0092] In one embodiment, since the battery module is a fixed series structure, which is composed of a plurality of battery cells connected in series, it can be known that the module rated capacity corresponding to the battery module is the same as the battery rated capacity corresponding to the battery cell.

[0093] Specifically, the relationship between the module rated capacity corresponding to the battery module and the battery rated capacity corresponding to the battery cell is as follows:

[0094] ;

[0095] In the formula, is the rated capacity of the battery module. It is the rated capacity of the battery corresponding to the battery cell.

[0096] In one embodiment, since multiple battery modules form a dynamically reconfigurable battery network by means of N parallel battery modules and M series battery modules, the battery network rated capacity of the dynamically reconfigurable battery network is closely related to the number N of parallel battery modules of the parallel battery modules.

[0097] Specifically, the relationship between the rated capacity of the battery network and the number N of parallel battery modules is as follows:

[0098] ;

[0099] In the formula, is the number of parallel battery modules, is the rated capacity of the battery module. is the rated sub-capacity and also the rated capacity of the battery network.

[0100] In one embodiment, based on the relationship between the rated capacity of the battery network and the number N of parallel battery modules, as well as the relationship between the module rated capacity corresponding to the battery module and the battery rated capacity corresponding to the battery cell, it can be known that the number N of parallel battery modules is related to the rated sub-capacity corresponding to the digital energy storage subsystem and the battery rated capacity corresponding to the battery cell. Based on this, a formula for calculating the number of parallel battery modules is designed.

[0101] In one embodiment, the formula for calculating the number of parallel battery modules is as follows:

[0102] ;

[0103] in, is the number of parallel battery modules, is the rated sub-capacity, is the rated capacity of the battery.

[0104] In one embodiment, when determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity, the battery rated capacity and the rated sub-capacity are input into a preset parallel battery module number calculation formula to obtain the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network.

[0105] Step 104: Obtain the battery rated voltage and the battery rated current corresponding to the battery cell, and simultaneously obtain the number of series-connected battery cells corresponding to the battery module, and determine the number of series-connected battery modules in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series-connected battery cells, the number of parallel-connected battery modules and the rated sub-power.

[0106] In one embodiment, since the battery module is a fixed series structure, which is composed of a plurality of battery cells connected in series, it can be known that the module rated current corresponding to the battery module is the same as the battery rated current corresponding to the battery cell.

[0107] Specifically, the relationship between the module rated current corresponding to the battery module and the battery rated current corresponding to the battery cell is as follows:

[0108] ;

[0109] In the formula, is the rated current of the battery module. It is the battery rated current corresponding to the battery cell.

[0110] In one embodiment, since the battery module is a fixed series structure consisting of multiple battery cells connected in series, it can be known that the module rated voltage corresponding to the battery module is the product of the battery rated voltage corresponding to the battery cell and the number of battery cells connected in series in the battery module.

[0111] Specifically, based on the battery rated voltage corresponding to the battery cell and the number of battery cells connected in series, the module rated voltage of the battery module is determined, wherein the relationship between the module rated voltage corresponding to the battery module and the battery rated voltage corresponding to the battery cell is as follows:

[0112] ;

[0113] In the formula, is the rated voltage of the battery module. is the number of battery cells connected in series in the battery module, It is the rated voltage of the battery corresponding to the battery cell.

[0114] In one embodiment, since multiple battery modules form a dynamically reconfigurable battery network by means of N parallel battery modules and M series battery modules, the battery network rated power of the dynamically reconfigurable battery network is related to the module rated voltage and module rated current corresponding to the battery modules.

[0115] Specifically, the relationship between the rated power of the battery network of the dynamically reconfigurable battery network and the rated voltage and rated current of the module corresponding to the battery module is as follows:

[0116] ;

[0117] In the formula, is the rated sub-power, and is also the rated power of the battery network corresponding to the dynamically reconfigurable battery network. The module rated voltage corresponding to the battery module, is the rated current of the battery module. is the number of parallel battery modules, is the number of battery modules connected in series.

[0118] In one embodiment, based on the relationship between the battery network rated power of the above-mentioned dynamically reconfigurable battery network and the module rated voltage and module rated current corresponding to the battery module, the relationship between the module rated voltage corresponding to the battery module and the battery rated voltage corresponding to the battery cell, and the relationship between the module rated current corresponding to the battery module and the battery rated current corresponding to the battery cell, it can be known that the number M of series-connected battery modules is related to the rated sub-power corresponding to the digital energy storage subsystem and the battery rated voltage and battery rated current corresponding to the battery cell, the number of parallel battery modules, and the number of series-connected battery cells in the battery module. Based on this, a formula for calculating the number of series-connected battery modules is designed.

[0119] Specifically, the formula for calculating the number of series-connected battery modules is as follows:

[0120] ;

[0121] In the formula, is the number of battery cells connected in series, is the number of battery modules connected in series, is the rated voltage of the battery, is the battery rated current, is the number of parallel battery modules, is the rated sub-power.

[0122] Preferably, the number of battery cells connected in series in the battery module Due to the limitations of processing and operation conditions, it is difficult to achieve a large size. The selection needs to be flexibly determined in combination with the battery module model and operating conditions.

[0123] In one embodiment, the battery rated voltage, the battery rated current, the number of battery cells connected in series, the number of battery modules connected in parallel and the rated sub-power are substituted into a preset formula for calculating the number of battery modules connected in series to obtain the number of battery modules connected in series of parallel battery modules in the dynamically reconfigurable battery network.

[0124] In one embodiment, since the power electronic switch in the dynamically reconfigurable battery network is connected in series with the battery module in the dynamically reconfigurable battery network, it can be known that the maximum voltage borne by each power electronic switch is equal to the module rated voltage corresponding to the battery module. .

[0125] In one embodiment, the module rated voltage of the battery module is determined based on the battery rated voltage corresponding to the battery cell and the number of battery cells connected in series; and the switch rated voltage of the power electronic switch is determined based on the module rated voltage.

[0126] Specifically, the power electronic switch is selected according to a voltage margin of 1.5-2 times.

[0127] Specifically, when determining the switch rated voltage of the power electronic switch based on the module rated voltage, the module rated voltage is input into a preset switch rated voltage calculation formula to obtain the switch rated voltage of the power electronic switch, wherein the switch rated voltage calculation formula is as follows:

[0128] ;

[0129] In the formula, is the rated voltage of the switch, is the rated voltage of the module,

[0130] In one embodiment, it is considered that the maximum current flowing through each power electronic switch is equal to the current of the battery module; preferably, the power electronic switch is selected according to 1.5-2 times the current margin.

[0131] In one embodiment, based on the battery rated current corresponding to the battery cell, the module rated current of the battery module is determined.

[0132] Specifically, the module rated current is input into a preset switch rated current calculation formula to obtain the switch rated current of the power electronic switch, wherein the switch rated current calculation formula is as follows:

[0133] ;

[0134] In the formula, is the rated current of the switch, is the rated current of the module.

[0135] In one embodiment, since the digital energy storage subsystem also includes a power conversion system, the power conversion system is connected to the dynamically reconfigurable battery network; since the reconfigurable battery network dynamically reconfigures the connection method of the battery module, the voltage at its output end will fluctuate within a certain range. Therefore, the DC side of the power conversion system PCS allows the voltage to fluctuate within a certain range. When determining the parameters of the power conversion system PCS, it is necessary to determine the DC side voltage lower limit and the DC side voltage upper limit of the power conversion system PCS.

[0136] In one embodiment, considering an extreme case, when all battery cells reach the discharge cut-off voltage at the same time, the DC side voltage of the power conversion system PCS is the lowest, and this voltage value is used as the lower limit of the DC side voltage of the power conversion system PCS.

[0137] In one embodiment, a discharge cut-off voltage corresponding to a battery cell is obtained, and a DC side voltage lower limit of the power conversion system is determined based on the discharge cut-off voltage, the number of battery cells connected in series, and the number of battery modules connected in parallel.

[0138] Specifically, when determining the DC side voltage lower limit of the power conversion system based on the discharge cut-off voltage, the number of battery cells connected in series, and the number of battery modules connected in parallel, the discharge cut-off voltage, the number of battery cells connected in series, and the number of battery modules connected in parallel are input into a preset DC side voltage lower limit calculation formula to obtain the DC side voltage lower limit of the power conversion system, wherein the DC side voltage lower limit calculation formula is as follows:

[0139] ;

[0140] In the formula, is the lower limit of DC side voltage, is the number of battery cells connected in series, is the number of battery modules connected in series, is the discharge cut-off voltage corresponding to the battery cell.

[0141] In one embodiment, considering an extreme case, when all battery cells reach the charging cut-off voltage at the same time, the DC side voltage of the power conversion system PCS is the highest, and this voltage value is used as the upper limit of the DC side voltage of the power conversion system PCS.

[0142] In one embodiment, a charging cut-off voltage corresponding to a battery cell is obtained, and an upper limit of a DC side voltage of the power conversion system is determined based on the charging cut-off voltage, the number of battery cells connected in series, and the number of battery modules connected in parallel.

[0143] Specifically, when determining the upper limit of the DC side voltage of the power conversion system based on the charging cut-off voltage, the number of battery cells connected in series, and the number of battery modules connected in parallel, the charging cut-off voltage, the number of battery cells connected in series, and the number of battery modules connected in parallel are input into a preset DC side voltage upper limit calculation formula, as shown below:

[0144] ;

[0145] In the formula, is the upper limit of DC side voltage, is the number of battery cells connected in series, is the number of battery modules connected in series, It is the charging cut-off voltage corresponding to the battery cell.

[0146] As an example of a design method for a digital energy storage system provided in this embodiment: taking a 5MW / 13kAh digital energy storage system as an example, how to design the key parameters of each component of the digital energy storage system is specifically explained; in this example, the rated power target of the digital energy storage system is 5MW, and the rated capacity target is 13kAh.

[0147] For the key parameter design of the digital energy storage subsystem in the digital energy storage system:

[0148] Since the goal is 5MW / 10MWh, the rated sub-voltage and rated sub-power of the digital energy storage subsystem are designed; first, the number of digital energy storage subsystems is determined according to the design requirements of the digital energy storage system. , here with For example, the rated sub-voltage and rated sub-power corresponding to the digital energy storage subsystem are as follows:

[0149] ;

[0150] .

[0151] Assume that the battery cell information is as follows:

[0152] .

[0153] According to the calculation formula of the number of parallel battery modules, calculate the number of parallel battery modules N:

[0154] .

[0155] Take an integer, then .

[0156] At the same time, according to the calculation formula of the number of battery modules connected in series, the number of battery modules connected in series M is calculated:

[0157] .

[0158] Considering that in actual applications, the number of battery cells connected in series in a battery module is limited by various factors such as production and use, and often cannot be arbitrarily determined, but can only be certain fixed integer values. For example, we have:

[0159] ;

[0160] Taking integers, we have .

[0161] The rated voltage of the power electronic switch is selected as a multiple of 1.5 of the rated voltage of the module, and then:

[0162] .

[0163] The rated current of the power electronic switch is selected as a multiple of 1.5 of the module rated current, and then:

[0164] .

[0165] In summary, the rated switching voltage of the power electronic switch shall not be lower than 38.4V, and the rated switching current of the power electronic switch shall not be lower than 154.5A.

[0166] For the voltage upper and lower limits of the DC side of the power conversion system PCS, according to the DC side voltage upper limit calculation formula and DC side voltage lower limit calculation formula, we have:

[0167] ;

[0168] .

[0169] In summary, the voltage range of the DC side of the power conversion system PCS must include the interval [600V, 888V].

[0170] In summary, the present application provides a design method for a digital energy storage system, which designs the architecture of the digital energy storage system from three different dimensions: battery module, dynamic reconfigurable battery network, and digital energy storage subsystem; introduces the dynamic reconfigurable battery network into the architecture of the digital energy storage system, transforms the traditional analog battery energy storage system into a digital battery energy storage system, and improves the efficiency and safety of the battery network; realizes the conversion of electric energy through the cooperation of the power conversion system PCS and the transformer, so that the dynamic reconfigurable battery network is always in a low-voltage system, while ensuring the power and capacity output requirements, this method improves the safety and reliability of the battery network.

[0171] Example 2, see Figure 2 , Figure 2 is a structural schematic diagram of an embodiment of a design device for a digital energy storage system provided by the present application, such as Figure 2 As shown, the device includes a system setting module 201, a subsystem parameter setting module 202, a parallel battery module quantity determination module 203 and a series battery module quantity determination module 204, which are specifically as follows:

[0172] The system setting module 201 is used to set the digital energy storage system including a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell.

[0173] The subsystem parameter setting module 202 is used to obtain the rated total power and the rated total capacity of the digital energy storage system, and determine the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity.

[0174] The parallel battery module quantity determination module 203 is used to obtain the battery rated capacity corresponding to the battery cell, and determine the number of parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity.

[0175] The module 204 for determining the number of series battery modules is used to obtain the battery rated voltage and the battery rated current corresponding to the battery cell, and simultaneously obtain the number of series battery cells corresponding to the battery module, and determine the number of series battery modules of the series battery modules in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series battery cells, the number of parallel battery modules and the rated sub-power.

[0176] A design device for a digital energy storage system provided in this embodiment also includes: a power electronic switch parameter setting module.

[0177] In one embodiment, the dynamically reconfigurable battery network further includes a power electronic switch.

[0178] In one embodiment, the power electronic switch is connected in series with the battery module in the dynamically reconfigurable battery network.

[0179] In one embodiment, the power electronic switch parameter setting module is used to determine the module rated voltage of the battery module based on the battery rated voltage corresponding to the battery cell and the number of battery cells connected in series, and to determine the switch rated voltage of the power electronic switch based on the module rated voltage, and to determine the module rated current of the battery module based on the battery rated current corresponding to the battery cell.

[0180] A design device for a digital energy storage system provided in this embodiment also includes: a power conversion system parameter setting module.

[0181] In one embodiment, the digital energy storage subsystem also includes a power conversion system.

[0182] In one embodiment, the power conversion system is connected to the dynamically reconfigurable battery network.

[0183] In one embodiment, the power conversion system parameter setting module is used to obtain the discharge cut-off voltage corresponding to the battery cell, determine the lower limit of the DC side voltage of the power conversion system based on the discharge cut-off voltage, the number of battery cells connected in series and the number of battery modules connected in parallel, obtain the charge cut-off voltage corresponding to the battery cell, and determine the upper limit of the DC side voltage of the power conversion system based on the charge cut-off voltage, the number of battery cells connected in series and the number of battery modules connected in parallel.

[0184] In one embodiment, the subsystem parameter setting module 202 is used to determine the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity, specifically including: obtaining the number of subsystems of the digital energy storage subsystem in the digital energy storage system, substituting the number of subsystems, the rated total power and the rated total capacity into a preset digital energy storage subsystem parameter calculation formula to obtain the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem, wherein the digital energy storage subsystem parameter calculation formula is as follows:

[0185] ;

[0186] in, is the rated sub-power, is the rated sub-capacity, is the rated total power, is the rated total capacity, is the number of subsystems.

[0187] A design device for a digital energy storage system provided in this embodiment further includes: the dynamically reconfigurable battery network parameter setting module.

[0188] In one embodiment, the dynamically reconfigurable battery network parameter setting module is used to set the rated sub-power corresponding to the digital energy storage subsystem to the battery network rated power corresponding to the dynamically reconfigurable battery network, and to set the rated sub-capacity corresponding to the digital energy storage subsystem to the battery network rated capacity corresponding to the dynamically reconfigurable battery network.

[0189] In one embodiment, the parallel battery module quantity determination module 203 is used to determine the parallel battery module quantity of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity, specifically including: inputting the battery rated capacity and the rated sub-capacity into a preset parallel battery module quantity calculation formula to obtain the parallel battery module quantity of the parallel battery modules in the dynamically reconfigurable battery network, wherein the parallel battery module quantity calculation formula is as follows:

[0190] ;

[0191] in, is the number of parallel battery modules, is the rated sub-capacity, is the rated capacity of the battery.

[0192] In one embodiment, the series battery module quantity determination module 204 is used to determine the number of series battery modules of the series battery modules in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series battery cells, the number of parallel battery modules and the rated sub-power, specifically including: substituting the battery rated voltage, the battery rated current, the number of series battery cells, the number of parallel battery modules and the rated sub-power into a preset series battery module quantity calculation formula to obtain the number of series battery modules of the parallel battery modules in the dynamically reconfigurable battery network, wherein the series battery module quantity calculation formula is as follows:

[0193] ;

[0194] In the formula, is the number of battery cells connected in series, is the number of battery modules connected in series, is the rated voltage of the battery, is the battery rated current, is the number of parallel battery modules, is the rated sub-power.

[0195] The above-mentioned digital energy storage system design device can implement the digital energy storage system design method of the above-mentioned method embodiment. The options in the above-mentioned method embodiment are also applicable to this embodiment and will not be described in detail here.

[0196] The embodiment of the present application further provides a digital energy storage system, including a digital energy storage subsystem, the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell;

[0197] The method for determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem includes: obtaining the rated total power and rated total capacity of the digital energy storage system, and determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity;

[0198] The method for determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network comprises: obtaining the battery rated capacity corresponding to the battery cell, and determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity;

[0199] The method for determining the number of series-connected battery modules in the dynamically reconfigurable battery network includes: obtaining the battery rated voltage and the battery rated current corresponding to the battery cell, and simultaneously obtaining the number of series-connected battery cells corresponding to the battery module, and determining the number of series-connected battery modules in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series-connected battery cells, the number of parallel battery modules and the rated sub-power.

[0200] Figure 7 A schematic diagram of the structure of a terminal device. Figure 7 As shown, the terminal device 7 of this embodiment includes: at least one processor 701 ( Figure 7 Only one is shown in the figure) a processor, a memory 702, and a computer program 703 stored in the memory 702 and executable on at least one processor 701, and when the processor 701 executes the computer program 703, the steps in any of the above method embodiments are implemented.

[0201] The terminal device 7 may be a computing device such as a smart phone, a laptop, a tablet computer, and a desktop computer. The terminal device may include but is not limited to a processor 701 and a memory 702. Those skilled in the art will appreciate that Figure 7 It is only an example of the terminal device 7 and does not constitute a limitation on the terminal device 7. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, etc.

[0202] The processor 701 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0203] In some embodiments, the memory 702 may be an internal storage unit of the terminal device 7, such as a hard disk or memory of the terminal device 7. In other embodiments, the memory 702 may also be an external storage device of the terminal device 7, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal device 7. Further, the memory 702 may also include both an internal storage unit and an external storage device of the terminal device 7. The memory 702 is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as program codes of a computer program. The memory 702 may also be used to temporarily store data that has been output or is to be output.

[0204] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0205] An embodiment of the present application provides a computer program product. When the computer program product is run on a terminal device, the terminal device implements the steps in the above-mentioned method embodiments when executing the computer program product.

[0206] In several embodiments provided in the present application, it is understood that each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and a module, a program segment or a part of a code includes one or more executable instructions for realizing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes also be executed in the opposite order, depending on the functions involved.

[0207] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions for a terminal device to execute all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

[0208] Based on the above-mentioned embodiment of the design method of the digital energy storage system, another embodiment of the present invention provides a computer program product. When the computer program product is run on a computer device, the computer device executes the design method of the digital energy storage system of any embodiment of the present invention.

[0209] In summary, the present application provides a design method, device, equipment and storage medium for a digital energy storage system, which includes a digital energy storage system including a digital energy storage subsystem, the digital energy storage subsystem including a dynamically reconfigurable battery network, the dynamically reconfigurable battery network including a battery module, and the battery module including a battery cell; based on the rated total power and rated total capacity of the digital energy storage system, the rated sub-power and rated sub-capacity of the digital energy storage subsystem are determined; based on the battery rated capacity and rated sub-capacity of the battery cell, the number of parallel battery modules of the parallel battery modules in the dynamic reconfigurable battery network is determined; based on the battery rated voltage, battery rated current, the number of battery cells in series of the battery module, the number of parallel battery modules and the rated sub-power of the battery cell, the number of series battery modules of the parallel battery modules in the dynamic reconfigurable battery network is determined; compared with the prior art, the technical solution of the present invention can improve the safety and reliability of the battery network.

[0210] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A design method for a digital energy storage system, characterized in that: include: The digital energy storage system includes a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell; Acquire the rated total power and the rated total capacity of the digital energy storage system, and determine the rated sub-power and the rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity; The battery rated capacity corresponding to the battery cell is obtained, and the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network is determined based on the battery rated capacity and the rated sub-capacity; the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network is determined based on the battery rated capacity and the rated sub-capacity, specifically including: inputting the battery rated capacity and the rated sub-capacity into a preset parallel battery module number calculation formula to obtain the parallel battery module number of the parallel battery modules in the dynamically reconfigurable battery network, wherein the parallel battery module number calculation formula is as follows: ； in, is the number of parallel battery modules, is the rated sub-capacity, is the rated capacity of the battery; The battery rated voltage and the battery rated current corresponding to the battery cell are obtained, and the number of battery cells in series corresponding to the battery module is obtained, and the number of battery modules in series of the battery modules in the dynamic reconfigurable battery network is determined based on the battery rated voltage, the battery rated current, the number of battery cells in series, the number of battery modules in parallel, and the rated sub-power; the number of battery modules in series of the battery modules in the dynamic reconfigurable battery network is determined based on the battery rated voltage, the battery rated current, the number of battery cells in series, the number of battery modules in parallel, and the rated sub-power, specifically including: substituting the battery rated voltage, the battery rated current, the number of battery cells in series, the number of battery modules in parallel, and the rated sub-power into a preset calculation formula for the number of battery modules in series to obtain the number of battery modules in series of the battery modules in parallel in the dynamic reconfigurable battery network, wherein the calculation formula for the number of battery modules in series is as follows: ； In the formula, is the number of battery cells connected in series, is the number of battery modules connected in series, is the rated voltage of the battery, is the battery rated current, is the number of parallel battery modules, is the rated sub-power.

2. A design method for a digital energy storage system as claimed in claim 1, characterized in that: The dynamically reconfigurable battery network also includes a power electronic switch; The power electronic switch is connected in series with the battery module in the dynamically reconfigurable battery network; Determine the module rated voltage of the battery module based on the battery rated voltage corresponding to the battery cell and the number of battery cells connected in series, and determine the switch rated voltage of the power electronic switch based on the module rated voltage; The module rated current of the battery module is determined based on the battery rated current corresponding to the battery cell.

3. A design method for a digital energy storage system as claimed in claim 1, characterized in that: The digital energy storage subsystem also includes a power conversion system; The power conversion system is connected to the dynamically reconfigurable battery network; Obtaining a discharge cut-off voltage corresponding to a battery cell, and determining a DC side voltage lower limit of the power conversion system based on the discharge cut-off voltage, the number of the series-connected battery cells, and the number of the parallel-connected battery modules; The charging cut-off voltage corresponding to the battery cell is obtained, and based on the charging cut-off voltage, the number of the series-connected battery cells and the number of the parallel-connected battery modules, the upper limit of the DC side voltage of the power conversion system is determined.

4. A design method for a digital energy storage system as claimed in claim 1, characterized in that: Determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity specifically includes: Obtain the number of subsystems of the digital energy storage subsystem in the digital energy storage system, substitute the number of subsystems, the rated total power and the rated total capacity into a preset digital energy storage subsystem parameter calculation formula, and obtain the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem, wherein the digital energy storage subsystem parameter calculation formula is as follows: ； in, is the rated sub-power, is the rated sub-capacity, is the rated total power, is the rated total capacity, is the number of subsystems.

5. A design method for a digital energy storage system as claimed in claim 1, characterized in that: Also includes: The rated sub-power corresponding to the digital energy storage subsystem is set to the battery network rated power corresponding to the dynamically reconfigurable battery network, and the rated sub-capacity corresponding to the digital energy storage subsystem is set to the battery network rated capacity corresponding to the dynamically reconfigurable battery network.

6. A design device for a digital energy storage system, characterized in that: include: System setting module, subsystem parameter setting module, parallel battery module quantity determination module and series battery module quantity determination module; Wherein, the system setting module is used to set the digital energy storage system to include a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell; The subsystem parameter setting module is used to obtain the rated total power and the rated total capacity of the digital energy storage system, and determine the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity; The parallel battery module quantity determination module is used to obtain the battery rated capacity corresponding to the battery monomer, and determine the parallel battery module quantity of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity; the determination of the parallel battery module quantity of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity specifically includes: inputting the battery rated capacity and the rated sub-capacity into a preset parallel battery module quantity calculation formula to obtain the parallel battery module quantity of the parallel battery modules in the dynamically reconfigurable battery network, wherein the parallel battery module quantity calculation formula is as follows: ； in, is the number of parallel battery modules, is the rated sub-capacity, is the rated capacity of the battery; The module for determining the number of series battery modules is used to obtain the battery rated voltage and the battery rated current corresponding to the battery monomer, and at the same time obtain the number of series battery monomers corresponding to the battery module, and determine the number of series battery modules of the series battery modules in the dynamic reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series battery monomers, the number of parallel battery modules and the rated sub-power; the module for determining the number of series battery modules of the series battery modules in the dynamic reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series battery monomers, the number of parallel battery modules and the rated sub-power specifically includes: substituting the battery rated voltage, the battery rated current, the number of series battery monomers, the number of parallel battery modules and the rated sub-power into a preset series battery module number calculation formula to obtain the number of series battery modules of the parallel battery modules in the dynamic reconfigurable battery network, wherein the series battery module number calculation formula is as follows: ； In the formula, is the number of battery cells connected in series, is the number of battery modules connected in series, is the rated voltage of the battery, is the battery rated current, is the number of parallel battery modules, is the rated sub-power.

7. A digital energy storage system, characterized in that: A digital energy storage subsystem is included, wherein the digital energy storage subsystem includes a dynamically reconfigurable battery network, wherein the dynamically reconfigurable battery network includes a battery module, and wherein the battery module includes a battery cell; The method for determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem includes: obtaining the rated total power and rated total capacity of the digital energy storage system, and determining the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity; The method for determining the number of parallel battery modules of parallel battery modules in the dynamically reconfigurable battery network includes: obtaining the battery rated capacity corresponding to the battery monomer, and determining the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity; the method for determining the number of parallel battery modules of parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity specifically includes: inputting the battery rated capacity and the rated sub-capacity into a preset parallel battery module number calculation formula to obtain the number of parallel battery modules of the parallel battery modules in the dynamically reconfigurable battery network, wherein the parallel battery module number calculation formula is as follows: ； in, is the number of parallel battery modules, is the rated sub-capacity, is the rated capacity of the battery; The method for determining the number of series-connected battery modules of the series-connected battery modules in the dynamic reconfigurable battery network includes: obtaining the battery rated voltage and the battery rated current corresponding to the battery monomer, and simultaneously obtaining the number of series-connected battery monomers corresponding to the battery module, and determining the number of series-connected battery modules of the series-connected battery modules in the dynamic reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series-connected battery monomers, the number of parallel-connected battery modules, and the rated sub-power; the method for determining the number of series-connected battery modules of the series-connected battery modules in the dynamic reconfigurable battery network based on the battery rated voltage, the battery rated current, the number of series-connected battery monomers, the number of parallel-connected battery modules, and the rated sub-power specifically includes: substituting the battery rated voltage, the battery rated current, the number of series-connected battery monomers, the number of parallel-connected battery modules, and the rated sub-power into a preset series-connected battery module number calculation formula to obtain the number of series-connected battery modules of the parallel-connected battery modules in the dynamic reconfigurable battery network, wherein the series-connected battery module number calculation formula is as follows: ； In the formula, is the number of battery cells connected in series, is the number of battery modules connected in series, is the rated voltage of the battery, is the battery rated current, is the number of parallel battery modules, is the rated sub-power.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the design method of the digital energy storage system according to any one of claims 1 to 5.

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