Design method and apparatus for digital energy storage system, and digital energy storage system

Abstract

Disclosed in the present invention are a design method and apparatus for a digital energy storage system, and a digital energy storage system. The method comprises: configuring a digital energy storage system to comprise a digital energy storage subsystem, the digital energy storage subsystem comprising a dynamically reconfigurable battery network, the dynamically reconfigurable battery network comprising battery modules, and each battery module comprising battery cells; on the basis of a rated total power and a rated total capacity of the digital energy storage system, determining a rated sub-power and a rated sub-capacity of the digital energy storage subsystem; on the basis of battery rated capacities of the battery cells and the rated sub-capacity, determining the number of parallel battery modules in the dynamically reconfigurable battery network; and, on the basis of battery rated voltages and battery rated currents of the battery cells, the number of series battery cells of the battery modules, the number of the parallel battery modules, and the rated sub-power, determining the number of series battery modules in the dynamically reconfigurable battery network. Compared with the prior art, the technical solution of the present invention can improve the safety and reliability of battery networks.

Description

Design method and device of digital energy storage system and digital energy storage system TECHNICAL FIELD

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

[0002] Energy storage technology plays a vital role in modern energy systems. By achieving rapid dynamic matching between power generation curve and load curve, energy storage systems can smooth fluctuations, match supply and demand, and cut 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, problems in safety and economy have become increasingly prominent.

[0003] In terms of safety, in the face of surging market demand and complex application scenarios, energy storage safety accidents occur frequently worldwide, including projects involving well-known energy storage suppliers. The expansion of energy storage system integration scale and the multiplication of battery products and electrical equipment increase the potential danger of quality problems. In addition, the increase in the number and level of battery series and parallel connections makes the combination of electrical and power electronic devices more complex, increasing the difficulty of ensuring the safety of energy storage systems. Relying solely on simple device stacking and traditional firefighting tools cannot substantially improve the safety of energy storage systems. SUMMARY

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

[0005] To solve the above technical problems, the present application provides a design method of digital energy storage system, comprising:

[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] The rated total power and rated total capacity of the digital energy storage system are obtained, and based on the rated total power and rated total capacity, the rated sub-power and rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system are determined.

[0008] The battery rated capacity corresponding to the battery cell is obtained, and 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.

[0009] acquire a battery rated voltage and a battery rated current corresponding to the battery monomer, acquire a number of series battery monomers corresponding to the battery module, and determine a number of series battery modules in the series 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.

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

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

[0012] Determine a module rated voltage of the battery module based on the battery rated voltage corresponding to the battery monomer and the number of series battery monomers, and determine a switching rated voltage of the power electronic switch based on the module rated voltage.

[0013] Determine a module rated current of the battery module based on the battery rated current corresponding to the battery monomer.

[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 dynamic reconfigurable battery network.

[0016] Acquire a discharge cutoff voltage corresponding to the battery monomer, and determine a lower limit of a direct-current side voltage of the power conversion system based on the discharge cutoff voltage, the number of series battery monomers, and the number of parallel battery modules.

[0017] Acquire a charge cutoff voltage corresponding to the battery monomer, and determine an upper limit of the direct-current side voltage of the power conversion system based on the charge cutoff voltage, the number of series battery monomers, and the number of parallel battery modules.

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

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

[0020] wherein, P TQ is the rated sub-power T P is the rated sub-capacity total Q is the rated total power total P is the rated total capacity, and T is the number of subsystems.

[0021] The design method of the digital energy storage system provided in the application further includes:

[0022] The rated sub-power corresponding to the digital energy storage subsystem is set as the battery network rated power corresponding to the dynamic reconfigurable battery network, and the rated sub-capacity corresponding to the digital energy storage subsystem is set as the battery network rated capacity corresponding to the dynamic reconfigurable battery network.

[0023] In a possible implementation, based on the battery rated capacity and the rated sub-capacity, the number of parallel battery modules in the dynamic reconfigurable battery network is determined, specifically including:

[0024] 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 in the dynamic reconfigurable battery network, wherein the parallel battery module number calculation formula is as follows:

[0025] wherein N is the number of parallel battery modules, Q T P is the rated sub-capacity cell is the battery rated capacity.

[0026] In a possible implementation, 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, the number of series battery modules in the dynamic reconfigurable battery network is determined, specifically including:

[0027] 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 are substituted into a preset series battery module number calculation formula to obtain the number of series battery modules in the dynamic reconfigurable battery network, wherein the series battery module number calculation formula is as follows:

[0028] wherein K is the number of series battery cells, M is the number of series battery modules, V cell is the battery rated voltage cell is the battery rated current T P is the rated sub-power.

[0029] The application also provides a design device of a digital energy storage system, comprising a system setting module, a subsystem parameter setting module, a parallel battery module number determination module and a series battery module number determination module;

[0030] The system setting module is configured to set the digital energy storage system to comprise a digital energy storage subsystem, wherein the digital energy storage subsystem comprises a dynamically reconfigurable battery network, and the dynamically reconfigurable battery network comprises a battery module, and the battery module comprises a battery cell.

[0031] The subsystem parameter setting module is configured to obtain a rated total power and a rated total capacity of the digital energy storage system, and determine a rated subsystem power and a rated subsystem 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.

[0032] The parallel battery module number determination module is configured to obtain a battery rated capacity corresponding to the battery cell, and determine a parallel battery module number of a parallel battery module in the dynamically reconfigurable battery network based on the battery rated capacity and the rated subsystem capacity.

[0033] The series battery module number determination module is configured to obtain a battery rated voltage and a battery rated current corresponding to the battery cell, and simultaneously obtain a series battery cell number corresponding to the battery module, and determine a series battery module number of a series battery module in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the series battery cell number, the parallel battery module number and the rated subsystem power.

[0034] The design device of the digital energy storage system provided by the application further comprises a power electronic switch parameter setting module.

[0035] The dynamically reconfigurable battery network further comprises a power electronic switch.

[0036] The power electronic switch is connected in series with the battery module in the dynamically reconfigurable battery network.

[0037] The power electronic switch parameter setting module is configured to determine a module rated voltage of the battery module based on the battery rated voltage corresponding to the battery cell and the series battery cell number, determine a switch rated voltage of the power electronic switch based on the module rated voltage, and determine a module rated current of the battery module based on the battery rated current corresponding to the battery cell.

[0038] The design device of the digital energy storage system provided by the application further comprises a power conversion system parameter setting module.

[0039] The digital energy storage subsystem further comprises a power conversion system;

[0040] The power conversion system is connected with the dynamic reconfigurable battery network.

[0041] The power conversion system parameter setting module is configured to acquire a discharge cutoff voltage corresponding to a battery monomer, determine a lower limit of a direct current side voltage of the power conversion system based on the discharge cutoff voltage, the number of series-connected battery monomers and the number of parallel-connected battery modules, acquire a charge cutoff voltage corresponding to the battery monomer, and determine an upper limit of the direct current side voltage of the power conversion system based on the charge cutoff voltage, the number of series-connected battery monomers and the number of parallel-connected battery modules.

[0042] In a possible implementation, the subsystem parameter setting module is configured to determine a rated sub-power and a 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, and specifically includes:

[0043] The number of subsystems of the digital energy storage subsystem in the digital energy storage system is acquired, 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 the rated sub-capacity corresponding to the digital energy storage subsystem, where the digital energy storage subsystem parameter calculation formula is as follows:

[0044] wherein P T is the rated sub-power, Q T is the rated sub-capacity, P total is the rated total power, Q total is the rated total capacity, and T is the number of subsystems.

[0045] The design device of the digital energy storage system provided in the application further comprises a dynamic reconfigurable battery network parameter setting module.

[0046] The dynamic reconfigurable battery network parameter setting module is configured to set the rated sub-power corresponding to the digital energy storage subsystem as a battery network rated power corresponding to the dynamic reconfigurable battery network, and set the rated sub-capacity corresponding to the digital energy storage subsystem as a battery network rated capacity corresponding to the dynamic reconfigurable battery network.

[0047] In a possible implementation, the number of parallel-connected battery modules determination module is configured to determine the number of parallel-connected battery modules in the dynamic reconfigurable battery network based on the battery rated capacity and the rated sub-capacity, and specifically includes:

[0048] 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 module in the dynamic reconfigurable battery network, wherein the parallel battery module quantity calculation formula is as follows:

[0049] wherein N is the parallel battery module quantity, Q T is the rated sub-capacity, and Q cell is the battery rated capacity.

[0050] In a possible implementation, the series battery module quantity determination module is configured to determine the series battery module quantity of the series battery module in the dynamic reconfigurable battery network based on the battery rated voltage, the battery rated current, the series battery monomer quantity, the parallel battery module quantity, and the rated sub-power, and specifically includes:

[0051] inputting the battery rated voltage, the battery rated current, the series battery monomer quantity, the parallel battery module quantity, and the rated sub-power into a preset series battery module quantity calculation formula to obtain the series battery module quantity of the parallel battery module in the dynamic reconfigurable battery network, wherein the series battery module quantity calculation formula is as follows:

[0052] wherein K is the series battery monomer quantity, M is the series battery module quantity, V cell is the battery rated voltage, I cell is the battery rated current, N is the parallel battery module quantity, and P T is the rated sub-power.

[0053] The application further provides a digital energy storage system, including a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamic reconfigurable battery network, and the dynamic reconfigurable battery network includes a battery module, and the battery module includes a battery monomer.

[0054] The method for determining the rated sub-power and the rated sub-capacity of the digital energy storage subsystem includes the following steps: obtaining a rated total power and a rated total capacity of the digital energy storage system, and determining the rated sub-power and the rated sub-capacity of the digital energy storage subsystem in the digital energy storage system based on the rated total power and the rated total capacity.

[0055] The method for determining the parallel battery module quantity of the parallel battery module in the dynamic reconfigurable battery network includes the following steps: obtaining a battery rated capacity corresponding to the battery monomer, and determining the parallel battery module quantity of the parallel battery module in the dynamic reconfigurable battery network based on the battery rated capacity and the rated sub-capacity.

[0056] The method for determining the number of series battery modules in the series battery module of the dynamic reconfigurable battery network comprises: acquiring the battery rated voltage and the battery rated current corresponding to the battery monomer, simultaneously acquiring the number of series battery monomers corresponding to the battery module, and determining the number of series battery modules in the series battery module of 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.

[0057] The application further provides a computer readable storage medium comprising a stored computer program, wherein the computer readable storage medium controls a device in which the computer readable storage medium is located to execute the design method of the digital energy storage system according to any one of the preceding embodiments when the computer program is executed.

[0058] Compared with the prior art, the design method, device, equipment, and storage medium of the digital energy storage system according to the embodiments of the application have the following beneficial effects:

[0059] By setting the digital energy storage system to comprise a digital energy storage subsystem, wherein the digital energy storage subsystem comprises a dynamic reconfigurable battery network, the dynamic reconfigurable battery network comprises a battery module, and the battery module comprises a battery monomer, the rated total power and the rated total capacity of the digital energy storage system are acquired, the rated sub-power and the rated sub-capacity of the digital energy storage subsystem corresponding to the digital energy storage system are determined based on the rated total power and the rated total capacity, the battery rated capacity corresponding to the battery monomer is acquired, the number of parallel battery modules in the dynamic reconfigurable battery network is determined based on the battery rated capacity and the rated sub-capacity, the battery rated voltage and the battery rated current corresponding to the battery monomer are acquired, the number of series battery modules in the series battery module of the dynamic reconfigurable battery network is determined 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, and compared with the prior art, the technical solution of the application introduces the dynamic reconfigurable battery network into the architecture of the digital energy storage system, converts the traditional analog battery energy storage system into a digital battery energy storage system, improves the efficiency and safety of the battery network, simultaneously acquires the rated total power and the total capacity of the digital energy storage system and the relevant data of the battery monomer, and the number of parallel battery modules and the number of series battery modules in the dynamic reconfigurable battery network are used to accurately calculate the rated sub-power and the sub-capacity of the digital energy storage subsystem, ensures that the operating condition of the digital energy storage system is always within the design range, and improves the safety and reliability of the battery network. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 is a flowchart of an embodiment of a design method of a digital energy storage system provided by the present application;

[0061] Figure 2 is a structural diagram of an embodiment of a design device of a digital energy storage system provided by the present application;

[0062] Figure 3 is a structural diagram of a digital energy storage subsystem provided by an embodiment of the present application;

[0063] Figure 4 is an architectural diagram of a digital energy storage system provided by an embodiment of the present application;

[0064] Figure 5 is an architectural diagram of a dynamically reconfigurable battery network provided by an embodiment of the present application;

[0065] Figure 6 is a structural diagram of a battery module provided by an embodiment of the present application;

[0066] Figure 7 is a structural diagram of a terminal device provided by the present application. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0068] Embodiment 1, referring to Figure 1, Figure 1 is a flowchart of an embodiment of a design method of a digital energy storage system provided by the present application, as shown in Figure 1, the method includes steps 101-104, specifically as follows:

[0069] Step 101: setting 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.

[0070] In an 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 a grid, as shown in Figure 3, which is a structural diagram of the digital energy storage subsystem.

[0071] Preferably, the direct current output of the reconfigurable battery network is inverted to low-voltage alternating current output by the power conversion system PCS, and the low-voltage alternating current output of the power conversion system PCS is connected to the grid through a transformer, and the grid voltage is 35kV alternating current. The transformer can realize the isolation of the high-voltage side and the low-voltage side, so that the battery network is always at a low potential. Because 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, which endanger the safe operation of the energy storage system. Therefore, through the cooperation of the power conversion system PCS and the transformer, the digital energy storage system not only realizes the conversion of electric energy, but also improves the safety of the energy storage system.

[0072] In an 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. As shown in FIG. 4, FIG. 4 is a schematic diagram of the architecture of the digital energy storage system.

[0073] In an embodiment, the dynamic reconfigurable battery network includes a plurality of battery modules, wherein the plurality of battery modules are connected in series to form series-connected battery modules, and the plurality of battery modules are connected in parallel to form parallel-connected battery modules.

[0074] In an embodiment, the dynamic reconfigurable battery network further includes a power electronic switch, the power electronic switch is connected in series with each battery module in the dynamic reconfigurable battery network, and whether the battery module connected in series with the power electronic switch is connected to the dynamic reconfigurable battery network is controlled based on the power electronic switch.

[0075] Preferably, the architecture of the dynamic reconfigurable battery network is built by N parallel-connected battery modules and M series-connected battery modules, N battery modules are reconfigurable in parallel to improve the maximum rated current of the dynamic reconfigurable battery network, and M battery modules are connected in series to provide sufficient direct current output voltage. As shown in FIG. 5, FIG. 5 is a schematic diagram of the architecture of the dynamic reconfigurable battery network.

[0076] In an embodiment, the dynamic reconfigurable battery network realizes adaptive reconfiguration of the network connection mode through the on-off of the power electronic switch, 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.

[0077] In an embodiment, the battery module includes a plurality of battery monomers, and the plurality of battery monomers are connected in series to form the battery module, for realizing the storage and supply of electric energy. As shown in FIG. 6, FIG. 6 is a structural schematic diagram of the battery module.

[0078] In an embodiment, since the capacity, voltage and current corresponding to a single battery module are small, which cannot meet the demand of the entire battery network, in the embodiment, a plurality of battery modules are connected in parallel through N parallel battery modules and in series through M series battery modules to form a dynamic reconfigurable battery network. The dynamic reconfigurable battery network is the core of the digital energy storage system. By coupling the battery module with a low-power power electronic switch, the reconfigurable connection of the dynamic reconfigurable battery network is realized, so that the dynamic reconfigurable battery network can dynamically change the connection mode between the battery modules in the process of charging and discharging of the digital energy storage system, which is the basis for realizing the safe, reliable and efficient operation of the direct current battery network. At the same time, in order to realize the energy and power output of the dynamic reconfigurable battery network, the dynamic reconfigurable battery network needs to be matched with power conversion system PCS, transformer and other devices 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 system operation.

[0079] Step 102: Obtain 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.

[0080] In an embodiment, the rated total power and rated total capacity in the digital energy storage system to be involved are obtained, wherein the rated total power and rated total capacity are the design total target of the known digital energy storage system, which can be directly obtained.

[0081] In an 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:

[0082] Wherein, P T is the rated sub-power, Q T is the rated sub-capacity, P total is the rated total power, Q total is the rated total capacity, and T is the number of subsystems.

[0083] Step 103: Obtain the battery rated capacity corresponding to the battery monomer, and determine the number of parallel battery modules of the parallel battery module in the dynamic reconfigurable battery network based on the battery rated capacity and the rated sub-capacity.

[0084] In an embodiment, based on the structural diagram of the digital energy storage subsystem, 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 dynamic 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 set as the battery network rated power corresponding to the dynamic reconfigurable battery network, and the rated sub-capacity corresponding to the digital energy storage subsystem is set as the battery network rated capacity corresponding to the dynamic reconfigurable battery network.

[0085] In an embodiment, since the battery module is a fixed series structure formed by a plurality of battery monomers 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 monomer.

[0086] Specifically, the relationship between the module rated capacity corresponding to the battery module and the battery rated capacity corresponding to the battery monomer is as follows: module cell ;

[0087] In the formula, Q module is the module rated capacity corresponding to the battery module, and Q cell is the battery rated capacity corresponding to the battery monomer.

[0088] In an embodiment, since the plurality of battery modules form the dynamic reconfigurable battery network in the manner of N parallel battery modules and M series battery modules, the battery network rated capacity of the dynamic reconfigurable battery network is closely related to the number N of parallel battery modules.

[0089] Specifically, the relationship between the battery network rated capacity and the number N of parallel battery modules is as follows: module T ;

[0090] In the formula, N is the number of parallel battery modules, Q module is the module rated capacity corresponding to the battery module, and Q T is the rated sub-capacity, which is also the battery network rated capacity.

[0091] In an embodiment, based on the relationship between the battery network rated capacity and the number N of parallel battery modules, and the relationship between the module rated capacity corresponding to the battery module and the battery rated capacity corresponding to the battery monomer, 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 monomer, and based on this, a parallel battery module number calculation formula is designed. ​​

[0092] In an embodiment, the parallel battery module quantity calculation formula is as follows:

[0093] Wherein, N is the parallel battery module quantity, Q T is the rated sub-capacity, Q cell is the battery rated capacity.

[0094] In an embodiment, when determining the parallel battery module quantity of the parallel battery module in the dynamic 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 quantity calculation formula to obtain the parallel battery module quantity of the parallel battery module in the dynamic reconfigurable battery network.

[0095] Step 104: Obtain the battery rated voltage and the battery rated current corresponding to the battery monomer, and obtain the series battery monomer quantity corresponding to the battery module at the same time, and determine the series battery module quantity of the series battery module in the dynamic reconfigurable battery network based on the battery rated voltage, the battery rated current, the series battery monomer quantity, the parallel battery module quantity and the rated sub-power.

[0096] In an embodiment, since the battery module is a fixed series structure composed of a plurality of battery monomers 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 monomer.

[0097] Specifically, the relationship between the module rated current corresponding to the battery module and the battery rated current corresponding to the battery monomer is as follows: I module = I cell ;

[0098] In the formula, I module is the module rated current corresponding to the battery module, and I cell is the battery rated current corresponding to the battery monomer.

[0099] In an embodiment, since the battery module is a fixed series structure composed of a plurality of battery monomers 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 monomer and the series battery monomer quantity in the battery module.

[0100] Specifically, the module rated voltage of the battery module is determined based on the battery rated voltage corresponding to the battery monomer and the series battery monomer quantity, wherein the relationship between the module rated voltage corresponding to the battery module and the battery rated voltage corresponding to the battery monomer is as follows: V module = KV cell ;

[0101] wherein V module is the module rated voltage corresponding to the battery module, K is the number of series battery cells in the battery module, V cell is the battery rated voltage corresponding to the battery cell.

[0102] In an embodiment, since the plurality of battery modules form the dynamically reconfigurable battery network in the manner 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 corresponding to the battery module and the module rated current.

[0103] Specifically, the relationship between the battery network rated power of the dynamically reconfigurable battery network and the module rated voltage corresponding to the battery module and the module rated current is as follows: P T = V module ·M·I module ·N;

[0104] wherein P T is the rated sub-power, which is also the battery network rated power corresponding to the dynamically reconfigurable battery network, V module is the module rated voltage corresponding to the battery module, I module is the module rated current corresponding to the battery module, N is the number of parallel battery modules, and M is the number of series battery modules.

[0105] In an embodiment, based on the relationship between the battery network rated power of the dynamically reconfigurable battery network and the module rated voltage corresponding to the battery module and the module rated current, 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 of series battery modules M is related to the rated sub-power corresponding to the digital energy storage subsystem, the battery rated voltage and the battery rated current corresponding to the battery cell, the number of parallel battery modules, and the number of series battery cells in the battery module. Based on this, a series battery module number calculation formula is designed.

[0106] Specifically, the series battery module number calculation formula is as follows:

[0107] wherein K is the number of series battery cells, M is the number of series battery modules, V cell is the battery rated voltage, I cell is the battery rated current, N is the number of parallel battery modules, and P T is the rated sub-power.

[0108] Preferably, the number K of series-connected battery cells in the battery module is limited by processing, operation and other conditions, and it is difficult to be large, so the selection of K needs to be determined flexibly in combination with the model and operation conditions of the battery module.

[0109] In an embodiment, 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 are substituted 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.

[0110] In an embodiment, since the power electronic switches in the dynamic reconfigurable battery network are connected in series with the battery modules in the dynamic reconfigurable battery network, it can be known that the maximum voltage borne by each power electronic switch is equal to the module rated voltage V module of the battery module corresponding to the power electronic switch.

[0111] In an embodiment, based on the battery rated voltage corresponding to the battery cell and the number of series-connected battery cells, the module rated voltage of the battery module is determined, and based on the module rated voltage, the switch rated voltage of the power electronic switch is determined.

[0112] Specifically, the power electronic switch is selected according to a voltage margin of 1.5-2 times.

[0113] Specifically, when the switch rated voltage of the power electronic switch is determined 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: V switch = 1.5-2V module .

[0114] In the formula, V switch is the switch rated voltage, V module is the module rated voltage,

[0115] In an embodiment, considering 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 a current margin of 1.5-2 times.

[0116] In an embodiment, based on the battery rated current corresponding to the battery cell, the module rated current of the battery module is determined,

[0117] 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: I switch = 1.5-2Imodule ;

[0118] In the formula, I switch is the rated current of the switch, I module is the rated current of the module.

[0119] In an embodiment, since the digital energy storage subsystem further comprises a power conversion system connected with the dynamically reconfigurable battery network, since the reconfigurable battery network dynamically reconfigures the connection mode of the battery modules, the voltage at the output end of the reconfigurable battery network fluctuates within a certain range, therefore, the DC side of the power conversion system PCS allows the voltage to fluctuate within a certain range, and when determining the parameters of the power conversion system PCS, the lower limit of the DC side voltage of the power conversion system PCS and the upper limit of the DC side voltage of the power conversion system PCS need to be determined.

[0120] In an embodiment, considering the extreme case that all battery cells reach the discharge cutoff voltage at the same time, the DC side voltage of the power conversion system PCS is the lowest, and this voltage value is taken as the lower limit of the DC side voltage of the power conversion system PCS.

[0121] In an embodiment, the discharge cutoff voltage corresponding to the battery cell is obtained, and based on the discharge cutoff voltage, the number of series-connected battery cells, and the number of parallel-connected battery modules, the lower limit of the DC side voltage of the power conversion system is determined.

[0122] Specifically, when determining the lower limit of the DC side voltage of the power conversion system based on the discharge cutoff voltage, the number of series-connected battery cells, and the number of parallel-connected battery modules, the discharge cutoff voltage, the number of series-connected battery cells, and the number of parallel-connected battery modules are input into a preset lower limit of DC side voltage calculation formula to obtain the lower limit of the DC side voltage of the power conversion system, wherein the lower limit of DC side voltage calculation formula is as follows: V PCSmin = KMV lower ;

[0123] In the formula, V PCSmin is the lower limit of the DC side voltage, K is the number of series-connected battery cells, M is the number of parallel-connected battery modules, and V lower is the discharge cutoff voltage corresponding to the battery cell.

[0124] In an embodiment, considering the extreme case that all battery cells reach the charge cutoff voltage at the same time, the DC side voltage of the power conversion system PCS is the highest, and this voltage value is taken as the upper limit of the DC side voltage of the power conversion system PCS.

[0125] In an embodiment, the charge cutoff voltage corresponding to the battery cell is obtained, and based on the charge cutoff voltage, the number of series-connected battery cells, and the number of parallel-connected battery modules, the upper limit of the DC side voltage of the power conversion system is determined.

[0126] Specifically, when determining the upper limit of the DC side voltage of the power conversion system based on the charging cutoff voltage, the number of series battery monomers, and the number of parallel battery modules, the charging cutoff voltage, the number of series battery monomers, and the number of parallel battery modules are input into a preset upper limit of DC side voltage calculation formula as follows: V PCSmax = KMV upper ;

[0127] In the formula, V PCSmax is the upper limit of the DC side voltage, K is the number of series battery monomers, M is the number of series battery modules, and V upper is the charging cutoff voltage corresponding to the battery monomer.

[0128] As an example of the design method of the 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 described; in this example, the target of the rated power of the digital energy storage system is 5MW, and the target of the rated capacity is 13kAh.

[0129] For the design of the key parameters of the digital energy storage subsystem in the digital energy storage system:

[0130] Since the target is 5MW / 10MWh, the rated sub-voltage and the rated sub-power of the digital energy storage subsystem are designed; first, the number T of digital energy storage subsystems is determined according to the design requirements of the digital energy storage system, and here T=16 is taken as an example, then the rated sub-voltage and the rated sub-power of the digital energy storage subsystem are as follows:

[0131] Suppose the information of the battery monomer is as follows: V cell =3.2V, I cell =103A, Q cell =206Ah, V upper =3.7V, V lower =2.5V.

[0132] Then, according to the parallel battery module number calculation formula, the number N of parallel battery modules is calculated:

[0133] Take the integer, then N=4.

[0134] At the same time, according to the series battery module number calculation formula, the number M of series battery modules is calculated:

[0135] Considering that the number of battery cells in series in the battery module is limited by various factors such as production and use in actual applications, it cannot be randomly valued, but can only take some fixed integer value, here K = 8 is taken as an example, then there are:

[0136] Taking the integer, M = 30.

[0137] The switching rated voltage of the power electronic switch is selected according to the voltage multiple of 1.5 times the module rated voltage, then there are: V switch = 1.5V module = 1.5 x 8 x 3.2V = 38.4V.

[0138] The switching rated current of the power electronic switch is selected according to the current multiple of 1.5 times the module rated current, then there are: I switch = 1.5I module = 1.5 x 103A = 154.5A.

[0139] In summary, the switching rated voltage of the power electronic switch cannot be lower than 38.4V, and the switching rated current of the power electronic switch cannot be lower than 154.5A.

[0140] For the upper and lower limits of the voltage of the power conversion system PCS DC side, according to the DC side voltage upper limit calculation formula and the DC side voltage lower limit calculation formula, then there are: V PCSmin = KMV lower = 8 x 30 x 2.5V = 600V; V PCSmax = KMV upper = 8 x 30 x 3.7V = 888V.

[0141] In summary, the voltage range of the power conversion system PCS DC side must include the interval [600V, 888V].

[0142] In summary, the design method of the digital energy storage system provided in the application designs the architecture of the digital energy storage system from three different dimensions of the battery module, the dynamic reconfigurable battery network and the digital energy storage subsystem respectively; the dynamic reconfigurable battery network is introduced into the architecture of the digital energy storage system, the traditional analog battery energy storage system is changed into a digital battery energy storage system, and the efficiency and safety of the battery network are improved; the cooperation of the power conversion system PCS and the transformer realizes the transformation of electric energy, so that the dynamic reconfigurable battery network is always in a low-voltage system, while ensuring the power and capacity output demand, this way improves the safety and reliability of the battery network.

[0143] Embodiment 2, see Figure 2, Figure 2 is a structural schematic diagram of an embodiment of a design device of a digital energy storage system provided by the present application, as shown in Figure 2, the device includes a system setting module 201, a subsystem parameter setting module 202, a parallel battery module number determination module 203 and a series battery module number determination module 204, specifically as follows:

[0144] The system setting module 201 is configured 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, and the dynamically reconfigurable battery network includes a battery module, and the battery module includes a battery cell.

[0145] The subsystem parameter setting module 202 is configured to obtain a rated total power and a rated total capacity of the digital energy storage system, and determine a rated subsystem power and a rated subsystem 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.

[0146] The parallel battery module number determination module 203 is configured to obtain a battery rated capacity corresponding to the battery cell, and determine a parallel battery module number of a parallel battery module in the dynamically reconfigurable battery network based on the battery rated capacity and the rated subsystem capacity.

[0147] The series battery module number determination module 204 is configured to obtain a battery rated voltage and a battery rated current corresponding to the battery cell, and simultaneously obtain a series battery cell number corresponding to the battery module, and determine a series battery module number of a series battery module in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the series battery cell number, the parallel battery module number and the rated subsystem power.

[0148] The design device of the digital energy storage system provided in the embodiment further includes a power electronic switch parameter setting module.

[0149] In an embodiment, the dynamically reconfigurable battery network further includes a power electronic switch.

[0150] In an embodiment, the power electronic switch is connected in series with the battery module in the dynamically reconfigurable battery network.

[0151] In an embodiment, the power electronic switch parameter setting module is configured to determine a module rated voltage of the battery module based on the battery rated voltage corresponding to the battery cell and the series battery cell number, and determine a switch rated voltage of the power electronic switch based on the module rated voltage, and determine a module rated current of the battery module based on the battery rated current corresponding to the battery cell.

[0152] The design device of the digital energy storage system provided in the embodiment further includes a power conversion system parameter setting module.

[0153] In an embodiment, the digital energy storage subsystem further includes a power conversion system.

[0154] In an embodiment, the power conversion system is connected to the dynamically reconfigurable battery network.

[0155] In an embodiment, the power conversion system parameter setting module is configured to obtain a discharge cutoff voltage corresponding to a battery cell, determine a lower limit of a direct current side voltage of the power conversion system based on the discharge cutoff voltage, the number of series-connected battery cells, and the number of parallel-connected battery modules, obtain a charge cutoff voltage corresponding to the battery cell, and determine an upper limit of the direct current side voltage of the power conversion system based on the charge cutoff voltage, the number of series-connected battery cells, and the number of parallel-connected battery modules.

[0156] In an embodiment, the subsystem parameter setting module 202 is configured to determine a rated sub-power and a 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 a number of subsystems of the digital energy storage subsystem in the digital energy storage system, and 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 the rated sub-capacity corresponding to the digital energy storage subsystem, wherein the digital energy storage subsystem parameter calculation formula is as follows:

[0157] wherein P T is the rated sub-power, Q T is the rated sub-capacity, P total is the rated total power, Q total is the rated total capacity, and T is the number of subsystems.

[0158] The design device of the digital energy storage system provided in the embodiment further includes the dynamically reconfigurable battery network parameter setting module.

[0159] In an embodiment, the dynamically reconfigurable battery network parameter setting module is configured to set the rated sub-power corresponding to the digital energy storage subsystem as a battery network rated power corresponding to the dynamically reconfigurable battery network, and set the rated sub-capacity corresponding to the digital energy storage subsystem as a battery network rated capacity corresponding to the dynamically reconfigurable battery network.

[0160] In an embodiment, the parallel battery module quantity determination module 203 is configured to determine the parallel battery module quantity of the parallel battery modules in the dynamic reconfigurable battery network based on the battery rated capacity and the rated sub-capacity, and 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 dynamic reconfigurable battery network, wherein the parallel battery module quantity calculation formula is as follows:

[0161] wherein N is the parallel battery module quantity, Q T is the rated sub-capacity, and Q cell is the battery rated capacity.

[0162] In an embodiment, the series battery module quantity determination module 204 is configured to determine the series battery module quantity of the series battery modules in the dynamic reconfigurable battery network based on the battery rated voltage, the battery rated current, the series battery monomer quantity, the parallel battery module quantity, and the rated sub-power, and specifically includes: inputting the battery rated voltage, the battery rated current, the series battery monomer quantity, the parallel battery module quantity, and the rated sub-power into a preset series battery module quantity calculation formula to obtain the series battery module quantity of the parallel battery modules in the dynamic reconfigurable battery network, wherein the series battery module quantity calculation formula is as follows:

[0163] wherein K is the series battery monomer quantity, M is the series battery module quantity, V cell is the battery rated voltage, I cell is the battery rated current, N is the parallel battery module quantity, and P T is the rated sub-power.

[0164] The design device of the digital energy storage system can implement the design method of the digital energy storage system of the above-mentioned method embodiments. The optional items in the above-mentioned method embodiments are also applicable to this embodiment, which will not be described in detail here.

[0165] The embodiment of the present application also provides a digital energy storage system, which includes a digital energy storage subsystem, the digital energy storage subsystem includes a dynamic reconfigurable battery network, the dynamic reconfigurable battery network includes a battery module, and the battery module includes a battery monomer.

[0166] The determination method of the rated sub-power and the rated sub-capacity corresponding to the digital energy storage subsystem includes: acquiring a rated total power and a rated total capacity of the digital energy storage system, and determining 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.

[0167] The method for determining the number of parallel battery modules in the dynamic reconfigurable battery network includes: obtaining the battery rated capacity corresponding to the battery monomer, and determining the number of parallel battery modules in the dynamic reconfigurable battery network based on the battery rated capacity and the rated sub-capacity.

[0168] The method for determining the number of series 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 battery monomers corresponding to the battery module, and determining the number of 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.

[0169] FIG. 7 is a schematic diagram of a structure of a terminal device. As shown in FIG. 7, the terminal device 7 of this embodiment includes at least one processor 701 (only one processor is shown in FIG. 7), a memory 702, and a computer program 703 stored in the memory 702 and executable on the at least one processor 701, and the processor 701 implements the steps in any method embodiment described above when executing the computer program 703.

[0170] The terminal device 7 can be a smart phone, a notebook computer, a tablet computer, a desktop computer, and the like. The terminal device can include but is not limited to the processor 701 and the memory 702. Those skilled in the art can understand that FIG. 7 is only an example of the terminal device 7, and does not limit the terminal device 7, and can include more or fewer components than the diagram, or combine certain components, or different components, for example, can also include an input / output device, a network access device, and the like.

[0171] The processor 701 can be a central processing unit (CPU), and the processor 701 can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, or the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0172] The memory 702 can be an internal storage unit of the terminal device 7, for example, a hard disk or a memory of the terminal device 7 in some embodiments. The memory 702 can also be an external storage device of the terminal device 7, for example, 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 in some other embodiments. Further, the memory 702 can include both the internal storage unit and the external storage device of the terminal device 7. The memory 702 is used to store an operating system, an application program, a boot loader, data, and other programs, for example, program codes of a computer program, etc. The memory 702 can also be used to temporarily store data that has been output or is to be output.

[0173] In addition, the embodiments of the present application further provide a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the steps in any of the above method embodiments.

[0174] The embodiments of the present application provide a computer program product. When the computer program product is run on a terminal device, the terminal device executes the steps in each of the above method embodiments.

[0175] In the several embodiments provided in the present application, it can be understood that each block in the flowchart or block diagram can represent a module, a segment or a portion of code, which includes one or more executable instructions for implementing the specified logic function. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in a different order than that noted in the figure. For example, two blocks noted in succession can in fact be executed substantially concurrently or in the reverse order, depending on the functionality involved.

[0176] If the 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 such an understanding, the technical solutions of the present application essentially or partly, or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a terminal device to execute all or part of the steps of the methods in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0177] On the basis of the above-mentioned embodiment of the design method of the digital energy storage system, another embodiment of the present application provides a computer program product, which, when running on a computer device, causes the computer device to execute the design method of the digital energy storage system of any one of the embodiments of the present application.

[0178] To sum up, the present application provides a design method, device, equipment and storage medium of a digital energy storage system, which sets the digital energy storage system to include 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 the rated total capacity of the digital energy storage system, the rated sub-power and the rated sub-capacity of the digital energy storage subsystem are determined; based on the battery rated capacity of the battery cell and the rated sub-capacity, the number of parallel battery modules in the dynamically reconfigurable battery network is determined; based on the battery rated voltage of the battery cell, the battery rated current, the number of series battery cells of the battery module, the number of parallel battery modules and the rated sub-power, the number of series battery modules of the parallel battery module in the dynamically reconfigurable battery network is determined; compared with the prior art, the technical solution of the present application can improve the safety and reliability of the battery network.

[0179] The above only describes the preferred embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can be made, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A method of designing a digital energy storage system, characterized by, The method comprises the following steps: setting a digital energy storage system comprising a digital energy storage subsystem, wherein the digital energy storage subsystem comprises a dynamically reconfigurable battery network, the dynamically reconfigurable battery network comprises a battery module, and the battery module comprises a battery cell; acquiring a rated total power and a rated total capacity of the digital energy storage system, and determining a rated sub-power and a 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; acquiring a battery rated capacity corresponding to the battery cell, and determining a parallel battery module number of parallel battery modules in the dynamically reconfigurable battery network based on the battery rated capacity and the rated sub-capacity; acquiring a battery rated voltage and a battery rated current corresponding to the battery cell, and simultaneously acquiring a series battery cell number corresponding to the battery module, and determining a series battery module number of series battery modules in the dynamically reconfigurable battery network based on the battery rated voltage, the battery rated current, the series battery cell number, the parallel battery module number and the rated sub-power.

2. A method of designing a digital energy storage system as claimed in claim 1, wherein, The dynamically reconfigurable battery network further comprises a power electronic switch; The power electronic switch is connected in series with the battery module in the dynamically reconfigurable battery network; Based on the battery rated voltage corresponding to the battery cell and the series battery cell number, the module rated voltage of the battery module is determined, and based on the module rated voltage, the switch rated voltage of the power electronic switch is determined; Based on the battery rated current corresponding to the battery cell, the module rated current of the battery module is determined.

3. The method of designing a digital energy storage system of claim 1, wherein, The digital energy storage subsystem further comprises a power conversion system; The power conversion system is connected with the dynamically reconfigurable battery network; The discharge cutoff voltage corresponding to the battery cell is acquired, and based on the discharge cutoff voltage, the series battery cell number and the parallel battery module number, the lower limit of the direct current side voltage of the power conversion system is determined; The charge cutoff voltage corresponding to the battery cell is acquired, and based on the charge cutoff voltage, the series battery cell number and the parallel battery module number, the upper limit of the direct current side voltage of the power conversion system is determined.

4. The method of designing a digital energy storage system of claim 1, wherein, Based on the rated total power and the rated total capacity, the rated sub-power and the rated sub-capacity corresponding to the digital energy storage subsystem in the digital energy storage system are determined, specifically comprising: The subsystem quantity of the digital energy storage subsystem in the digital energy storage system is obtained, the subsystem quantity, 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 the rated sub-capacity corresponding to the digital energy storage subsystem, wherein the digital energy storage subsystem parameter calculation formula is as follows: where P T is the rated sub-power, Q T is the rated sub-capacity, P total is the rated total power, Q total is the rated total capacity, and T is the number of subsystems.

5. The method of designing a digital energy storage system of claim 1, wherein, Further comprising: The rated sub-power corresponding to the digital energy storage subsystem is set as 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 as the battery network rated capacity corresponding to the dynamically reconfigurable battery network.

6. The method of designing a digital energy storage system of claim 1, wherein, Based on the battery rated capacity and the rated sub-capacity, the parallel battery module number of parallel battery modules in the dynamically reconfigurable battery network is determined, specifically comprising: inputting the battery rated capacity and the rated sub-capacity into a preset parallel battery module number calculation formula to obtain a parallel battery module number of the parallel battery modules in the dynamic reconfigurable battery network, wherein the parallel battery module number calculation formula is as follows: Wherein, N is the number of parallel battery modules, Q T is the rated sub-capacity, Q cell is the battery rated capacity.

7. The method of designing a digital energy storage system of claim 1, wherein, Based on the battery rated voltage, the battery rated current, the series battery cell number, the parallel battery module number and the rated sub-power, the series battery module number of series battery modules in the dynamically reconfigurable battery network is determined, specifically comprising: 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 are substituted 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, K is the number of series battery monomers, M is the number of series battery modules, V cell is the battery rated voltage, I cell is the battery rated current, N is the number of parallel battery modules, P T is the rated sub-power.

8. A design apparatus of a digital energy storage system, characterized by, Comprising: The system setting module, the subsystem parameter setting module, the parallel battery module number determination module and the series battery module number determination module; The system setting module is used for setting the digital energy storage system to include a digital energy storage subsystem, wherein the digital energy storage subsystem includes a dynamic reconfigurable battery network, and the dynamic reconfigurable battery network includes battery modules, and the battery modules include battery cells. The subsystem parameter setting module is used for obtaining rated total power and rated total capacity of the digital energy storage system, and determining rated subsystem power and rated subsystem 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 number determination module is used for obtaining battery rated capacity corresponding to the battery cells, and determining the number of parallel battery modules in the dynamic reconfigurable battery network based on the battery rated capacity and the rated subsystem capacity. The series battery module number determination module is used for obtaining battery rated voltage and battery rated current corresponding to the battery cells, and simultaneously obtaining the number of series battery cells corresponding to the battery modules, and determining the number of series battery modules in the dynamic 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 subsystem power.

9. A digital energy storage system characterized by, The digital energy storage subsystem includes a dynamic reconfigurable battery network, and the dynamic reconfigurable battery network includes battery modules, and the battery modules include battery cells. The method for determining rated subsystem power and rated subsystem capacity corresponding to the digital energy storage subsystem includes obtaining rated total power and rated total capacity of the digital energy storage system, and determining rated subsystem power and rated subsystem 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 in the dynamic reconfigurable battery network includes obtaining battery rated capacity corresponding to the battery cells, and determining the number of parallel battery modules in the dynamic reconfigurable battery network based on the battery rated capacity and the rated subsystem capacity. The method for determining the number of series battery modules in the dynamic reconfigurable battery network includes obtaining battery rated voltage and battery rated current corresponding to the battery cells, and simultaneously obtaining the number of series battery cells corresponding to the battery modules, and determining the number of series battery modules in the dynamic 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 subsystem power.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium includes a stored computer program, wherein the computer program controls the device where the computer readable storage medium is located to execute the design method of the digital energy storage system as claimed in any one of claims 1 to 7 when the computer program is running.

Images