Energy storage system, method for determining number of modules of energy storage system, and electronic device

Abstract

An energy storage system, a method for determining the number of modules of an energy storage system, and an electronic device. The method comprises: acquiring the total number of sub-modules (110) in an energy storage system, wherein each sub-module of the energy storage system comprises a power module (1110) and a plurality of battery modules (1120) connected to the power module in parallel, and the total number of sub-modules is related to the operation reliability of the power module; acquiring the number of battery modules of each sub-module in the energy storage system, wherein the number of battery modules is related to the operation reliability of the battery modules; and on the basis of the number of battery modules of each sub-module in the energy storage system and the total number of sub-modules, determining the total number of battery modules in the energy storage system. Therefore, necessary redundancy caused by the operation reliability of battery modules themselves is implemented at the levels of the battery modules themselves, thereby preventing an increase in the redundancy of power modules, other than the battery modules, in sub-modules that results from failure of the battery modules, and thus reducing the cost of the energy storage system.

Description

Energy storage system, energy storage system module quantity determination method and electronic device Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application No. 202410866566.6, filed on June 28, 2024, entitled “Energy storage system, energy storage system module quantity determination method and electronic device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of power systems, in particular to an energy storage system, an energy storage system module quantity determination method and an electronic device. BACKGROUND

[0003] A conventional DC engineering converter valve bridge arm is composed of a large number of power modules in cascade. The failure of power modules is inevitable during long-term operation. To avoid the impact of individual power module failure on the normal operation of the system, additional redundant modules are configured for fault module replacement in the system design.

[0004] The redundancy design method of the conventional converter valve engineering is to make the whole energy storage device module redundant. Such a redundancy method will lead to an increase in the number of redundant sub-modules in the case of battery module failure. However, the increase in the number of sub-modules will also increase the other power modules inside the sub-module except the battery module, thereby increasing the unnecessary module redundancy and further increasing the cost of the energy storage system. SUMMARY

[0005] In view of the above problems, the present application provides an energy storage system, an energy storage system module quantity determination method and an electronic device, which can solve the problem that the current energy storage system redundancy method increases the number of redundant sub-modules in the case of battery module failure, which increases the number of other power modules inside the sub-module except the battery module, thereby increasing the cost of the energy storage system.

[0006] In a first aspect, the present application provides an energy storage system, comprising a valve bridge arm, the valve bridge arm comprising a plurality of sub-modules connected in series, each sub-module comprising a power module and a plurality of battery modules connected in parallel with the power module; wherein the number of the plurality of sub-modules is determined according to the operation reliability of the power module, and the number of the plurality of battery modules is determined according to the operation reliability of the battery module.

[0007] The energy storage system designed above, the scheme considers the battery modules in the sub-modules of the energy storage system and other power modules except the battery modules, and the necessary redundancy caused by the operation reliability of the battery modules is realized at the battery module level, and the redundancy caused by the operation reliability of the power modules is realized at the sub-module level, so that the redundancy caused by the operation reliability of the battery modules does not affect the increase of the overall sub-module redundancy, thereby reducing the increase of the redundancy of the other power modules in the sub-module except the battery modules caused by the failure of the battery modules, and saving the cost of the energy storage system.

[0008] In some embodiments, the plurality of battery modules includes working battery modules and redundant battery modules; the working battery modules represent the battery modules required to maintain normal operation of the energy storage system; wherein the number of redundant battery modules is determined according to the number of working battery modules and the failure rate of the battery modules; or the number of redundant battery modules is determined according to the number of working battery modules, the failure rate of the battery modules and the system safety margin of the energy storage system.

[0009] The above embodiment, the number of redundant battery modules is determined by the failure rate of the battery modules or the failure rate of the battery modules combined with the system safety margin of the energy storage system, so that the necessary redundancy caused by the operation reliability of the battery modules is realized at the battery module level without affecting the redundancy of the overall sub-module, thereby reducing the increase of the redundancy of the other power modules in the sub-module except the battery modules caused by the failure of the battery modules, and saving the cost of the energy storage system.

[0010] In some embodiments, the plurality of sub-modules includes working sub-modules and redundant sub-modules, the working sub-modules represent the sub-modules required to maintain normal operation of the energy storage system; wherein the number of redundant sub-modules is determined according to the number of working sub-modules and the failure rate of the power modules; or the number of redundant sub-modules is determined according to the number of working sub-modules, the failure rate of the power modules and the system safety margin of the energy storage system.

[0011] The above embodiment, the number of redundant sub-modules is determined by the failure rate of the power modules or the failure rate of the power modules combined with the system safety margin of the energy storage system, so that the redundancy caused by the operation reliability of the power modules is realized at the sub-module level, and the redundancy of the battery modules in the sub-module is not affected, so that the battery modules in the sub-modules of the energy storage system and the other power modules except the battery modules are considered separately, thereby reducing the increase of the redundancy of the other power modules in the sub-module except the battery modules caused by the failure of the battery modules, and saving the cost of the energy storage system.

[0012] In some embodiments, the number of working sub-modules is determined according to the total voltage of the energy storage system, the overvoltage level of the energy storage system, and the minimum voltage value of the working sub-modules at different battery SOC.

[0013] In the above embodiment, the number of working sub-modules is determined according to the minimum voltage value of the working sub-modules at different battery SOC, so that the determined number of working sub-modules is more and more accurate than the number of sub-modules determined by the rated voltage of the sub-modules in the prior art. The redundant working sub-modules can be used as redundant sub-modules, thereby alleviating the situation that the fault tolerance and reliability of the energy storage system decrease with the increase of the service life, the energy storage system is shut down due to the failure to meet the requirements of fault tolerance and reliability, and the reliability of the energy storage system is improved.

[0014] In some embodiments, the total number of sub-modules is determined according to the number of working sub-modules, the number of redundant sub-modules, and the number of valve bridge arms.

[0015] In the above embodiment, the total number of sub-modules is determined by taking the number of valve bridge arms into account, so that the way of determining the number of sub-modules in the present application can be applied to energy storage systems with various types of valve bridge arms, thereby improving the applicability.

[0016] In some embodiments, the total number of battery modules is determined according to the number of working battery modules, the number of redundant battery modules, and the total number of sub-modules.

[0017] In a second aspect, the present application provides a method for determining the number of modules of an energy storage system, the method comprising: obtaining the total number of sub-modules in the energy storage system, wherein each sub-module of the energy storage system comprises a power module and a plurality of battery modules connected in parallel with the power module, the total number of sub-modules being related to the operation reliability of the power module; obtaining the number of battery modules of each sub-module in the energy storage system, wherein the number of battery modules is related to the operation reliability of the battery module; and determining the total number of battery modules in the energy storage system according to the number of battery modules of each sub-module in the energy storage system and the total number of sub-modules.

[0018] The module quantity determination method of the energy storage system with the above design distinguishes the battery modules in the sub-modules of the energy storage system from other power modules except the battery modules, implements the necessary redundancy caused by the operation reliability of the battery modules at the battery module level, and implements the redundancy caused by the operation reliability of the power modules at the sub-module level, so that the redundancy caused by the operation reliability of the battery modules does not affect the increase of the overall sub-module redundancy, thereby reducing the increase of the redundancy of the other power modules except the battery modules in the sub-module caused by the battery module failure, and saving the cost of the energy storage system while ensuring that the high-voltage energy storage device meets the safe and redundant operation in the whole life cycle.

[0019] In an optional implementation of the second aspect, the total quantity of the sub-modules in the energy storage system is obtained by: obtaining the quantities of working sub-modules and redundant sub-modules in the energy storage system; wherein the working sub-modules represent the sub-modules required to maintain the normal operation of the energy storage system; and determining the total quantity of the sub-modules in the energy storage system according to the quantity of the working sub-modules and the quantity of the redundant sub-modules.

[0020] In the above implementation, the total quantity of the sub-modules is determined according to the quantity of the working sub-modules and the quantity of the redundant sub-modules, so that the redundancy caused by the operation reliability of the power modules is implemented at the sub-module level, without affecting the redundancy of the battery modules in the sub-modules, further distinguishing the battery modules in the sub-modules of the energy storage system from other power modules except the battery modules, thereby reducing the increase of the redundancy of the other power modules except the battery modules in the sub-module caused by the battery module failure while ensuring that the high-voltage energy storage device meets the safe and redundant operation in the whole life cycle, and saving the cost of the energy storage system.

[0021] In an optional implementation of the second aspect, the quantity of the redundant sub-modules in the energy storage system is obtained by: obtaining the failure rate of the power modules; and determining the quantity of the redundant sub-modules according to the quantity of the working sub-modules and the failure rate of the power modules.

[0022] In the above implementation, the quantity of the redundant sub-modules is determined according to the failure rate of the power modules, so that the redundancy caused by the operation reliability of the power modules is implemented at the sub-module level, without affecting the redundancy of the battery modules in the sub-modules, further distinguishing the battery modules in the sub-modules of the energy storage system from other power modules except the battery modules, thereby reducing the increase of the redundancy of the other power modules except the battery modules in the sub-module caused by the battery module failure while ensuring that the high-voltage energy storage device meets the safe and redundant operation in the whole life cycle, and saving the cost of the energy storage system.

[0023] In an optional implementation of the second aspect, the number of redundant sub-modules in the energy storage system is obtained by: obtaining a failure rate of the power module and a system safety margin of the energy storage system; and determining the number of redundant sub-modules according to the number of working sub-modules, the failure rate of the power module, and the system safety margin of the energy storage system.

[0024] In the above implementation, the present solution not only distinguishes the battery module in the sub-module of the energy storage system from other power modules except the battery module, but also takes the system safety margin as a factor for increasing the redundant module, so that the number of designed redundant modules can better meet the number of safe operation of the energy storage system, thereby improving the reliability of the energy storage system.

[0025] In an optional implementation of the second aspect, the total number of sub-modules in the energy storage system is determined according to the number of working sub-modules and the number of redundant sub-modules, including: calculating the total number of sub-modules in the energy storage system according to the number of working sub-modules, the number of redundant sub-modules, and the number of valve bridge arms.

[0026] In the above implementation, the total number of sub-modules determined by the present solution takes the number of valve bridge arms into account, so that the way of determining the number of sub-modules in the present solution can be applied to energy storage systems of various types of valve bridge arms, thereby improving the applicability.

[0027] In an optional implementation of the second aspect, the number of battery modules of each sub-module in the energy storage system is obtained by: obtaining the number of working battery modules and the number of redundant battery modules of each sub-module in the energy storage system; wherein the working battery module represents the battery module required to maintain normal operation of the energy storage system; and determining the number of battery modules of each sub-module in the energy storage system according to the number of working battery modules and the number of redundant battery modules of each sub-module.

[0028] In the above implementation, the number of battery modules of each sub-module in the energy storage system is accurately determined by the number of working sub-modules and the number of redundant sub-modules of each sub-module in the energy storage system, so that the necessary redundancy caused by the operation reliability of the battery module itself is realized at the battery module itself level without affecting the redundancy of the overall sub-module, thereby reducing the increase of the redundancy of other power modules except the battery module in the sub-module due to the failure of the battery module, and further saving the cost of the energy storage system.

[0029] In an optional implementation of the second aspect, the number of redundant battery modules of each sub-module in the energy storage system is obtained by: obtaining a failure rate of the battery module; and determining the number of redundant battery modules according to the number of working battery modules and the failure rate of the battery module.

[0030] According to the above embodiment, the number of redundant battery modules is determined by the failure rate of the battery module or the failure rate of the battery module in combination with the system safety margin of the energy storage system, so that the necessary redundancy caused by the operation reliability of the battery module itself is realized at the battery module itself level without affecting the redundancy of the overall sub-module, thereby reducing the increase of the redundancy of other power modules in the sub-module except the battery module due to the failure of the battery module, and further saving the cost of the energy storage system.

[0031] In an optional implementation of the second aspect, wherein the number of redundant battery modules of each sub-module in the energy storage system is obtained, comprising: obtaining the failure rate of the battery module and the system safety margin of the energy storage system; determining the number of redundant battery modules according to the number of working battery modules, the failure rate of the battery module and the system safety margin of the energy storage system.

[0032] According to the above embodiment, the number of redundant battery modules is determined by the failure rate of the battery module or the failure rate of the battery module in combination with the system safety margin of the energy storage system, so that the necessary redundancy caused by the operation reliability of the battery module itself is realized at the battery module itself level without affecting the redundancy of the overall sub-module, thereby reducing the increase of the redundancy of other power modules in the sub-module except the battery module due to the failure of the battery module, and further saving the cost of the energy storage system.

[0033] In an optional implementation of the second aspect, the total number of battery modules in the energy storage system is determined according to the number of battery modules of each sub-module in the energy storage system and the total number of sub-modules, comprising: calculating the sum of the number of working battery modules and the number of redundant battery modules to obtain a first sum; calculating the product of the first sum and the total number of sub-modules to obtain the total number of battery modules in the energy storage system.

[0034] In an optional implementation of the second aspect, the number of working sub-modules in the energy storage system is obtained, comprising: obtaining the total voltage of the energy storage system, the overvoltage level of the energy storage system and the minimum voltage value of the working sub-module at different battery SOC; determining the number of working sub-modules in the energy storage system according to the total voltage of the energy storage system, the overvoltage level of the energy storage system and the minimum voltage value of the working sub-module at different battery SOC.

[0035] In a third aspect, the present application provides a module quantity determination device of an energy storage system, the device comprising an acquisition module and a determination module, the acquisition module being configured to acquire a total number of sub-modules in the energy storage system, wherein each sub-module of the energy storage system comprises a power module and a plurality of battery modules connected in parallel with the power module, the total number of the sub-modules being related to an operation reliability degree of the power module, and the acquisition module is further configured to acquire a number of the battery modules of each sub-module in the energy storage system, wherein the number of the battery modules is related to an operation reliability degree of the battery modules; and the determination module is configured to determine a total number of the battery modules in the energy storage system according to the number of the battery modules of each sub-module in the energy storage system and the total number of the sub-modules.

[0036] The module quantity determination device of the energy storage system has the advantages that the battery modules in the sub-modules of the energy storage system are considered separately from other power modules except the battery modules, the necessary redundancy caused by the operation reliability degree of the battery modules is realized at the level of the battery modules themselves, and the redundancy caused by the operation reliability degree of the power modules is realized at the level of the sub-modules, so that the redundancy caused by the operation reliability degree of the battery modules does not affect the increase of the overall sub-module redundancy, thereby reducing the increase of the redundancy of the other power modules except the battery modules in the sub-modules caused by the failure of the battery modules, and saving the cost of the energy storage system while ensuring that the high-voltage energy storage device meets the safe and redundant operation in the whole life cycle.

[0037] In a fourth aspect, the present application provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to execute the method in the second aspect or any possible implementation manner of the second aspect.

[0038] In a fifth aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to execute the method in the second aspect or any possible implementation manner of the second aspect.

[0039] In a sixth aspect, the present application provides a computer program product, wherein the computer program product is run on a computer to make the computer execute the method in the second aspect or any possible implementation manner of the second aspect.

[0040] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Through the drawings shown, the above and other purposes, features and advantages of the present application will be clearer. The same reference signs in all the drawings indicate the same parts. The drawings are not necessarily drawn in proportion to the actual size, and the focus is on showing the main idea of the present application.

[0042] Fig. 1 is a flowchart of a method for determining the number of modules of an energy storage system according to an embodiment of the present application;

[0043] Fig. 2 is a first schematic diagram of an energy storage system according to an embodiment of the present application;

[0044] Fig. 3 is a second schematic diagram of an energy storage system according to an embodiment of the present application;

[0045] Fig. 4 is a third schematic diagram of an energy storage system according to an embodiment of the present application;

[0046] Fig. 5 is a schematic diagram of a device for determining the number of modules of an energy storage system according to an embodiment of the present application;

[0047] Fig. 6 is a schematic diagram of an electronic device according to an embodiment of the present application.

[0048] Fig. 6 is a schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0051] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0052] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of other embodiments. One of ordinary skill in the art will readily recognize from the disclosure herein the possibility of combining features of different embodiments.

[0053] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which can represent three relationships, for example, A and / or B, which can represent three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0054] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0055] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0056] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0057] The conventional DC engineering converter valve bridge arm is composed of a large number of power modules in cascade. The failure of the power module is inevitable during long-term operation. In order to avoid the influence of the failure of individual power modules on the normal operation of the system, additional redundant modules are configured for replacing the failed modules in the system design.

[0058] The redundancy design method of the conventional converter valve project redundantly designs the energy storage device module as a whole. In the case of a fault in the battery module itself, the redundancy of the sub-module will increase. However, the increase in the redundancy of the entire sub-module will cause the power modules other than the battery module in the sub-module to also increase, thereby increasing the unnecessary module redundancy and the cost of the energy storage system.

[0059] Based on the above problems, the present application designs an energy storage system, a module quantity determination method of an energy storage system, and an electronic device. By distinguishing the battery module in the sub-module of the energy storage system from the other power modules other than the battery module, the necessary redundancy caused by the operation reliability of the battery module itself is realized at the battery module itself level, and the redundancy caused by the operation reliability of the power module is realized at the sub-module level. Therefore, the redundancy caused by the operation reliability of the battery module will not affect the increase of the overall sub-module redundancy. In the case of ensuring that the high-voltage energy storage device meets the safe redundancy operation in the entire life cycle, the redundancy of the power modules other than the battery module in the sub-module caused by the fault of the battery module is reduced, thereby saving the cost of the energy storage system.

[0060] Based on the above idea, the present application first provides a module quantity determination method of an energy storage system. The method distinguishes the battery module in the sub-module of the energy storage system from the other power modules other than the battery module, realizes the necessary redundancy caused by the operation reliability of the battery module itself at the battery module itself level, and realizes the redundancy caused by the operation reliability of the power module at the sub-module level. Therefore, the redundancy caused by the operation reliability of the battery module will not affect the increase of the overall sub-module redundancy. In order to better understand, the module quantity determination method of the energy storage system provided by the embodiment of the present application will be described below in combination with FIG. 1.

[0061] Step S100: obtaining the total number of sub-modules in the energy storage system.

[0062] Step S110: obtaining the number of battery modules in each sub-module in the energy storage system.

[0063] Step S120: determining the total number of battery modules in the energy storage system according to the number of battery modules in each sub-module in the energy storage system and the total number of sub-modules.

[0064] In the above embodiments, the valve bridge arm in the present application includes an energy storage valve bridge arm, which is an energy storage system structure connected together by a plurality of energy storage sub-modules to control the direction and size of the power flow of the power grid. The sub-module represents a sub-module contained in the energy storage system. The valve bridge arm can contain a plurality of sub-modules in series. The structure of the plurality of sub-modules can be all the same or partially the same. For example, the plurality of sub-modules can all be half-bridge energy storage sub-modules, or all be full-bridge energy storage sub-modules, or part be half-bridge energy storage sub-modules and part be full-bridge energy storage sub-modules.

[0065] Each sub-module can contain a power module and a plurality of battery modules connected in parallel to the power module. The battery module represents a plurality of parallel battery clusters in the sub-module. The power module represents a device module that controls the charging and discharging of the battery module in the sub-module. For example, the power module can include the IGBT\diode and capacitor parts in the sub-module.

[0066] In the energy storage system, a plurality of sub-modules are generally required to maintain the normal operation of the energy storage system, which are referred to as working sub-modules in the present application. A plurality of redundant sub-modules are also required to be configured as reliable backup modules in the energy storage system to improve the reliability of the energy storage system. The reliable backup sub-modules are referred to as redundant sub-modules in the present application. Accordingly, the working battery module represents the battery module that maintains the normal operation of the energy storage system, and the redundant battery module represents the battery module that is used as a reliable backup module in addition to the battery module that maintains the normal operation of the energy storage system.

[0067] In order to ensure that the energy storage system can operate efficiently and safely, the energy storage system needs to determine in advance the sub-modules and battery modules required for normal operation, as well as the sub-modules and battery modules that are used as reliable backups, so as to ensure that the energy storage system operates more efficiently and safely. In the present application, the total number of sub-modules and the total number of battery modules of the energy storage system are determined, and the operating reliability of the power module in the sub-module is considered, so that the number of redundant sub-modules is related to the operating reliability of the power module. In addition, the present application determines the number of working battery modules and the number of redundant battery modules in the energy storage system. In the case of determining the number of redundant battery modules, the operating reliability of the battery module is considered, so that the number of redundant battery modules is related to the operating reliability of the battery module. Furthermore, the battery module in the sub-module of the energy storage system is distinguished from other power modules except the battery module, so that the redundancy caused by the operating reliability of the battery module does not affect the increase of the overall sub-module redundancy. Furthermore, in the case of ensuring that the high-voltage energy storage device meets the safe and redundant operation in the whole life cycle, the increase of the redundancy of other power modules in the sub-module except the battery module caused by the failure of the battery module is reduced, thereby saving the cost of the energy storage system.

[0068] In an optional implementation of the embodiment, the operation reliability degree described above can be characterized or quantified by an operation reliability parameter of the module, specifically, the operation reliability degree can be characterized or quantified by a failure rate and / or a failure rate of the module. For example, the operation reliability degree of the power module described above can be the failure rate and / or the failure rate of the power module, and the operation reliability degree of the battery module can be the failure rate and / or the failure rate of the battery module.

[0069] The failure rate and / or the failure rate represents the probability of failure and / or malfunction of the module, which can specifically include failure caused by factors such as module operation failure, module device failure, and module device usage reaching the upper limit. The usage reaching the upper limit can mean that the module device usage reaches a specified period, for example, the end of the battery life or the end of the battery usage of the battery module means that the usage of the battery module reaches the upper limit. Specifically, the failure rate and / or the failure rate of the power module and the failure rate and / or the failure rate of the battery module can be obtained in advance.

[0070] The failure rate and / or the failure rate of the power module and the failure rate and / or the failure rate of the battery module can be obtained by detecting the failure characteristics of the power module and the battery module to be implemented by the energy storage system in advance. For example, the present scheme can detect the implemented power module and battery module by various sensors in the energy storage system implemented by the power module and battery module. Specifically, the present scheme can set voltage sensors, current sensors, and other detection devices to detect the implemented power module and battery module. The detection results of the voltage sensor and the current sensor are transmitted to the controller. The controller counts the number of failures of the power module and the battery module in the target time period through detection in the target time period, calculates the failure rate and / or the failure rate of the power module and the failure rate and / or the failure rate of the battery module according to the number of failures of the power module and the battery module in the target time period, and obtains the failure rate and / or the failure rate of the power module and the failure rate and / or the failure rate of the battery module.

[0071] In an optional implementation of the embodiment, as described above, the present scheme can obtain the total number of sub-modules. Before that, the present scheme needs to obtain the number of working sub-modules and the number of redundant sub-modules, and then determine the total number of sub-modules according to the number of working sub-modules and the number of redundant sub-modules.

[0072] The number of working sub-modules can be determined according to the total voltage of the energy storage system, the overvoltage level of the energy storage system, and the minimum voltage value of the working sub-modules at different battery SOC. Specifically, the number of working sub-modules N0 can be calculated by the formula: total voltage * overvoltage level / rated voltage. For example, assuming that the total voltage of the energy storage system is ±35kV, the overvoltage level of the energy storage system is 1.1 times, and the minimum voltage value of the working sub-modules at different battery SOC is 1.2kV, the number of working sub-modules is N0, in this case, N0 = 70 * 1.1 / 1.2 = 65, that is, the number of working sub-modules is 65, that is, the number of initial normal operation sub-modules in the energy storage system is 65. It can be understood that if the value of total voltage * overvoltage level / rated voltage is not an integer, it can be rounded up, for example, 5.1 is rounded up to 6. In addition to using the minimum voltage value of the sub-modules in the energy storage system at different battery SOC to determine the number of working sub-modules, the number of working sub-modules N0 can also be calculated by the rated voltage value, that is, total voltage * overvoltage level / rated voltage, and the specific method can be adjusted according to the actual application scenario.

[0073] In an optional embodiment of the present embodiment, as described above, the number of redundant sub-modules needs to be determined considering the operation reliability of the power module, assuming that the operation reliability is the failure rate, in this case, the failure rate of the power module can be obtained first; then the number of redundant sub-modules is determined according to the number of working sub-modules and the failure rate of the power module. The failure rate of the power module can be calculated by detecting the operating parameters of the power module by the sensor, and then calculating the number of power module failures in the target time period.

[0074] Specifically, the number of redundant sub-modules can be obtained by calculating the product of the number of working sub-modules and the failure rate of the power module. For example, assuming that the number of working sub-modules is N0, the failure rate of the power module is 5%, and the number of redundant sub-modules is N1, in this case, N1 = N0 * 5%. Specifically, assuming that the number of initial normal operation sub-modules in the energy storage system is 65 according to the foregoing description, in this case, the number of redundant sub-modules N1 = 65 * 5% = 4. It can be understood that if the value of the redundant sub-module is not an integer, it can be rounded up, for example, 3.25 is rounded up to 4.

[0075] In an optional embodiment of the present embodiment, as described above, the number of battery modules of each sub-module in the energy storage system also needs to be obtained, specifically, the number of battery modules of each sub-module needs to be determined according to the number of working battery modules and redundant battery modules of each sub-module in the energy storage system.

[0076] The number of working battery modules of each sub-module is obtained in the following manner: the number of working battery modules of each sub-module can be configured in advance by the present application, and the specific configuration number can be determined according to the number of working battery modules of each sub-module required for safe operation of the energy storage system. For example, the number of working battery modules of each sub-module can be designed according to the actual experience of the staff. Specifically, assuming that the total voltage of the energy storage system is ±35kV, the overvoltage level of the energy storage system is 1.1 times, and the minimum voltage value of the working sub-module under different battery SOC is 1.2kV, the number of 20 clusters of working battery modules can be included in each sub-module of the energy storage system. In this case, the staff generally configures the total voltage, overvoltage level and minimum voltage value of the working sub-module under different battery SOC of the energy storage system in advance according to the actual application requirements. In this case, the controller can receive the total voltage, overvoltage level and minimum voltage value of the working sub-module under different battery SOC of the energy storage system configured by the staff, and then calculate based on the total voltage, overvoltage level and minimum voltage value of the working sub-module under different battery SOC of the energy storage system configured by the staff to obtain the number of working sub-modules.

[0077] After obtaining the number of working battery modules in the above manner, the number of redundant battery modules can be obtained in the following manner: obtaining the failure rate of the battery module, and then determining the number of redundant battery modules according to the number of working battery modules and the failure rate of the battery module. The failure rate of the battery module can be calculated according to the foregoing description by detecting the operating parameters of the battery module through the sensor, and then calculating the failure rate of the battery module based on the number of battery module failures in the target time period.

[0078] Specifically, the number of redundant battery modules can be obtained by calculating the product of the number of working battery modules and the failure rate of the battery module. For example, assuming that the number of working battery modules is M0, the failure rate of the power module is 5%, and the number of redundant sub-modules is M1, in this case, M1=M0*5%. Specifically, assuming that according to the foregoing description, the number of normally operating battery modules in each sub-module of the energy storage system is 20, in this case, the number of redundant battery modules M1=20*5%=1. It can be understood that if the value of the redundant sub-module is not an integer, it can be rounded up.

[0079] After obtaining the number of working battery modules, the number of redundant battery modules, the number of working sub-modules and the number of redundant sub-modules respectively by the above embodiments, the present application can first calculate the total number of sub-modules in the energy storage system according to the number of working sub-modules and the number of redundant sub-modules.

[0080] As a possible implementation, the total number of sub-modules in the energy storage system can be calculated according to the number of working sub-modules, the number of redundant sub-modules, and the number of valve bridge arms. Specifically, the total number of sub-modules in the energy storage system = (the number of working sub-modules + the number of redundant sub-modules) * the number of valve bridge arms. For example, assuming that the total number of sub-modules is N, the number of valve bridge arms of the energy storage system is n, the number of working sub-modules is N0, and the number of redundant sub-modules is N1, in this case, the total number of sub-modules N = (N0+N1)*n. As a specific example, N0 is 65 as described above, the number of redundant sub-modules N1 is 4 as described above, and the number of valve bridge arms n is 1, in this case, the total number of sub-modules of the energy storage system N = (65+4)*1 = 69.

[0081] After obtaining the total number of sub-modules in the energy storage system in the above manner, the total number of battery modules in the energy storage system can be determined according to the number of working battery modules, the number of redundant battery modules, and the total number of sub-modules. Specifically, the total number of battery modules in the energy storage system can be calculated by calculating the sum of the number of working battery modules and the number of redundant battery modules, obtaining a first sum, and then calculating the product of the first sum and the total number of sub-modules. For example, assuming that the total number of sub-modules is N, the number of redundant battery modules is M1, the number of working battery modules is M0, and the total number of battery modules is M, in this case, the total number of battery modules M = (M1+M0)*N. Assuming that N is 69, the number of redundant battery modules M1 is 1, and the number of working battery modules M0 is 20, in this case, M = (1+20)*69 = 1449, wherein the number of battery modules in parallel with each sub-module is 21.

[0082] In an optional implementation of the present embodiment, considering that the energy storage system usually sets a system safety margin, i.e., a system safety factor, which is a constant, in order to be able to operate safely, when determining the number of redundant sub-modules and the number of redundant battery modules, the system safety margin can be taken into account, in which case, for obtaining the number of redundant sub-modules in the energy storage system, the present scheme can be obtained by the following manner: first, obtaining the failure rate of the power module and the system safety margin of the energy storage system; then determining the number of redundant sub-modules according to the number of working sub-modules, the failure rate of the power module, and the system safety margin of the energy storage system. Specifically, assuming that the number of redundant sub-modules is N2, the number of working sub-modules is N0, the system safety margin is x, and the failure rate of the power module is 5%, in this case, N2 = N0*5%*x. Assuming that the system safety margin is 2 and the number of working sub-modules N0 is 65 as described above, in this case, N2 = 65*5%*2 = 7, wherein it can be understood that if the value of the number of redundant sub-modules N2 is not an integer, it can be rounded up, for example, 6.5 is rounded up to 7.

[0083] In an optional implementation of the present embodiment, the number of redundant battery modules can be determined by first obtaining the failure rate of the battery modules and the system safety margin of the energy storage system, and then determining the number of redundant battery modules according to the number of working battery modules, the failure rate of the battery modules and the system safety margin of the energy storage system, in consideration of the system safety margin. Specifically, assuming that the number of redundant battery modules is M2, the number of working battery modules is M0, the system safety margin is x, the failure rate of the battery modules is 5%, in this case, M2 = M0 * 5% * x. Assuming that the system safety margin is 2 and the number of working battery modules N0 is 20 as described above, in this case, M2 = 20 * 5% * 2 = 2, where it can be understood that if the value of the redundant battery module M2 is not an integer, it can be rounded up.

[0084] In the above implementation, the number of redundant sub-modules and the number of redundant battery modules are obtained in consideration of the system safety margin, the total number of sub-modules in the energy storage system can be calculated according to the number of working sub-modules, the number of redundant sub-modules and the number of valve bridge arms. Specifically, the total number of sub-modules in the energy storage system = (number of working sub-modules + number of redundant sub-modules) * number of valve bridge arms. For example, assuming that the total number of sub-modules is N, the number of valve bridge arms of the energy storage system is n, the number of working sub-modules is N0, and the number of redundant sub-modules is N2, in this case, the total number of sub-modules N = (N0 + N2) * n. As a specific example, N0 is 65 as described above, the number of redundant sub-modules N2 is 7 as described above in consideration of the system safety margin, and the number of valve bridge arms n is 1, in this case, the total number of sub-modules of the energy storage system N = (65 + 7) * 1 = 72. Where the number of valve bridge arms in the example of the present application is 1, which is only an example, and the specific number of valve bridge arms is determined according to the specific structure of the energy storage system.

[0085] After obtaining the total number of the sub-modules in the energy storage system in the above manner, the total number of the battery modules in the energy storage system can be determined according to the number of the working battery modules, the number of the redundant battery modules, and the total number of the sub-modules. Specifically, the total number of the battery modules in the energy storage system can be obtained by calculating the sum of the number of the working battery modules and the number of the redundant battery modules, and then calculating the product of the first sum and the total number of the sub-modules. For example, assuming that the total number of the sub-modules is N, the number of the redundant battery modules is M2, the number of the working battery modules is M0, and the total number of the battery modules is M, in this case, the total number of the battery modules M = (M2+M0)*N. Assuming that N is the number 72 considering the system safety margin as described above, the number of the redundant battery modules M2 is 2, and the number of the working battery modules M0 is 20, in this case, M = (2+20)*72 = 1584, wherein the number of the battery modules in parallel in each sub-module is 22.

[0086] In the above embodiment, the number of the redundant modules designed by the present application can more meet the number of the safe operation of the energy storage system, thereby improving the reliability of the energy storage system, by considering not only the battery modules in the sub-modules of the energy storage system and other power modules except the battery modules, but also the system safety margin as a consideration factor for increasing the redundant modules.

[0087] After determining the number of the sub-modules in the energy storage system according to the above method, the energy storage system can be designed according to the determined number of the sub-modules. Therefore, based on the same inventive concept, the present application also provides an energy storage system, as shown in FIG. 2, which includes a valve bridge arm 10 including a plurality of sub-modules 110 connected in series, each of the sub-modules 110 including a power module 1110 and a plurality of battery modules 1120 connected in parallel with the power module; wherein the power module 1110 represents other functional modules in the sub-module 110 except the battery module 1120, the number of the plurality of sub-modules 110 is related to the operation reliability of the power module 1110, and the number of the plurality of battery modules 1120 is related to the operation reliability of the battery module 1120.

[0088] The number of the working sub-modules, the number of the redundant sub-modules, the number of the working battery modules, the number of the redundant battery modules, the total number of the sub-modules, and the total number of the battery modules in the energy storage system designed by the present application can be determined by the above-described method for determining the number of the sub-modules in the energy storage system, and the specific method is consistent with the above description, which will not be described here.

[0089] As a possible implementation, the number of valve bridge arms of the energy storage system designed by the present application can be one, at this time, the energy storage system is a direct hanging energy storage system, which can be shown in FIG. 2. It can be understood that the example shown in FIG. 2 is only a part of the energy storage system, and only the part related to the valve bridge arm is shown. It can be seen that in addition to containing a plurality of series-connected sub-modules (SM), the valve bridge arm can also contain devices such as reactors connected in series with the sub-modules, which are connected between the positive and negative DC buses.

[0090] As another possible implementation, the energy storage system designed by the present application can also contain a plurality of valve bridge arms, for example, as shown in the schematic diagrams of FIG. 3 and FIG. 4.

[0091] The energy storage system designed as described above, by distinguishing the battery modules in the sub-modules of the energy storage system from other power modules except the battery modules, the necessary redundancy caused by the operation reliability of the battery modules is realized at the level of the battery modules themselves, and the redundancy caused by the operation reliability of the power modules is realized at the level of the sub-modules, so that the redundancy caused by the operation reliability of the battery modules does not affect the increase of the overall sub-module redundancy, thereby reducing the increase of the redundancy of the other power modules in the sub-module except the battery modules caused by the failure of the battery modules, and thereby saving the cost of the energy storage system.

[0092] Based on the same inventive concept, FIG. 5 shows a schematic structural block diagram of a module number determination device of an energy storage system provided by the present application. It should be understood that the device corresponds to the method embodiment executed in FIG. 1, and can execute the steps involved in the foregoing method. The specific functions of the device can be referred to the description in the foregoing, and the detailed description is appropriately omitted here to avoid repetition. The device includes at least one software function module stored in the form of software or firmware in the memory or solidified in the operating system (OS) of the device. Specifically, the device includes an acquisition module 500 and a determination module 510. The acquisition module 500 is configured to acquire the total number of sub-modules in the energy storage system, wherein each sub-module of the energy storage system includes a power module and a plurality of battery modules connected in parallel with the power module, and the total number of the sub-modules is related to the operation reliability of the power module; and the number of battery modules of each sub-module in the energy storage system, wherein the number of battery modules is related to the operation reliability of the battery module; and the determination module 510 is configured to determine the total number of battery modules in the energy storage system according to the number of battery modules of each sub-module in the energy storage system and the total number of sub-modules.

[0093] The module quantity determination device of the energy storage system has the advantages that the battery modules in the sub-modules of the energy storage system are distinguished from other power modules except the battery modules, the necessary redundancy caused by the operation reliability of the battery modules is realized at the battery module level, the redundancy caused by the operation reliability of the power modules is realized at the sub-module level, the redundancy caused by the operation reliability of the battery modules does not affect the increase of the overall sub-module redundancy, the increase of the redundancy of the other power modules except the battery modules in the sub-module caused by the battery module failure is reduced under the condition that the high-voltage energy storage device meets the safe and redundant operation in the whole life cycle, and the cost of the energy storage system is saved.

[0094] According to some embodiments of the present application, as shown in FIG. 6, the present application provides an electronic device 6, comprising a processor 601 and a memory 602, the processor 601 and the memory 602 are interconnected and communicate with each other through a communication bus 603 and / or other forms of connection mechanism (not marked), the memory 602 stores a computer program executable by the processor 601, when the computing device is running, the processor 601 executes the computer program to execute the method of any optional implementation manner, for example, steps S100 to S120: obtaining the total number of sub-modules in the energy storage system; obtaining the number of battery modules in each sub-module in the energy storage system; determining the total number of battery modules in the energy storage system according to the number of battery modules in each sub-module in the energy storage system and the total number of sub-modules.

[0095] The present application provides a computer readable storage medium, the computer readable storage medium stores a computer program, the computer program is executed by the processor to execute the method in any optional implementation manner.

[0096] The storage medium can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0097] The application provides a computer program product which, when running on a computer, causes the computer to perform the method in any of the optional implementation manners.

[0098] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage system, comprising a valve bridge arm, the valve bridge arm comprising a plurality of sub-modules connected in series, each sub-module comprising a power module and a plurality of battery modules connected in parallel with the power module; in, The number of the multiple sub-modules is determined based on the operational reliability of the power module, and the number of the multiple battery modules is determined based on the operational reliability of the battery modules.

2. The energy storage system according to claim 1, wherein, The plurality of battery modules includes working battery modules and redundant battery modules; the working battery modules represent the battery modules required to maintain the normal operation of the energy storage system. The number of redundant battery modules is determined based on the number of working battery modules and the failure rate of the battery modules; or the number of redundant battery modules is determined based on the number of working battery modules, the failure rate of the battery modules, and the system safety margin of the energy storage system.

3. The energy storage system according to claim 1, wherein, The multiple submodules include working submodules and redundant submodules, wherein the working submodules represent the submodules required to maintain the normal operation of the energy storage system; The number of redundant submodules is determined based on the number of working submodules and the failure rate of the power module; or the number of redundant submodules is determined based on the number of working submodules, the failure rate of the power module, and the system safety margin of the energy storage system.

4. The energy storage system according to claim 3, wherein, The number of working sub-modules is specifically determined based on the total voltage of the energy storage system, the overvoltage level of the energy storage system, and the minimum voltage value of the working sub-module under different battery SOCs.

5. The energy storage system according to claim 3, wherein, The total number of submodules is determined based on the number of working submodules, the number of redundant submodules, and the number of valve bridge arms.

6. The energy storage system according to claim 5, wherein, The total number of battery modules is determined based on the number of working battery modules, the number of redundant battery modules, and the total number of sub-modules.

7. A method for determining the number of modules in an energy storage system, wherein, The method includes: Obtain the total number of submodules in the energy storage system, wherein each submodule of the energy storage system includes a power module and multiple battery modules connected in parallel with the power module, and the total number of submodules is related to the operational reliability of the power module; Obtain the number of battery modules in each submodule of the energy storage system, wherein the number of battery modules is related to the operational reliability of the battery modules; The total number of battery modules in the energy storage system is determined based on the number of battery modules in each submodule and the total number of submodules.

8. The method according to claim 7, wherein, The process of obtaining the total number of sub-modules in the energy storage system includes: Obtain the number of working submodules and redundant submodules in the energy storage system; wherein, the working submodules represent the submodules required to maintain the normal operation of the energy storage system; The total number of submodules in the energy storage system is determined based on the number of working submodules and the number of redundant submodules.

9. The method according to claim 8, wherein, Obtain the number of redundant submodules in the energy storage system, including: Obtain the failure rate of the power module; The number of redundant submodules is determined based on the number of working submodules and the failure rate of the power module.

10. The method according to claim 8, wherein, Obtain the number of redundant submodules in the energy storage system, including: Obtain the failure rate of the power module and the system safety margin of the energy storage system; The number of redundant submodules is determined based on the number of working submodules, the failure rate of the power module, and the system safety margin of the energy storage system.

11. The method according to claim 8, wherein, Determining the total number of submodules in the energy storage system based on the number of working submodules and the number of redundant submodules includes: The total number of submodules in the energy storage system is calculated based on the number of working submodules, the number of redundant submodules, and the number of valve bridge arms.

12. The method according to claim 7, wherein, The method of obtaining the number of battery modules in each submodule of the energy storage system includes: Obtain the number of working battery modules and redundant battery modules for each submodule in the energy storage system; wherein, the working battery module represents the battery module required to maintain the normal operation of the energy storage system; The number of battery modules in each submodule of the energy storage system is determined based on the number of working battery modules and the number of redundant battery modules in each submodule.

13. The method according to claim 12, wherein, Obtain the number of redundant battery modules for each submodule in the energy storage system, including: Obtain the failure rate of the battery module; The number of redundant battery modules is determined based on the number of working battery modules and the failure rate of the battery modules.

14. The method according to claim 12, wherein, Obtain the number of redundant battery modules for each submodule in the energy storage system, including: To obtain the failure rate of the battery module and the system safety margin of the energy storage system; The number of redundant battery modules is determined based on the number of working battery modules, the failure rate of the battery modules, and the system safety margin of the energy storage system.

15. The method according to claim 12, wherein, The determination of the total number of battery modules in the energy storage system based on the number of battery modules in each sub-module and the total number of sub-modules includes: Calculate the sum of the number of working battery modules and the number of redundant battery modules to obtain a first sum value; Calculate the product of the first sum and the total number of sub-modules to obtain the total number of battery modules in the energy storage system.

16. The method according to any one of claims 7-15, wherein, The acquisition of the number of working sub-modules in the energy storage system includes: The total voltage of the energy storage system, the overvoltage level of the energy storage system, and the minimum voltage value of the working submodule under different battery SOCs are obtained. The number of working submodules in the energy storage system is determined based on the total voltage of the energy storage system, the overvoltage level of the energy storage system, and the minimum voltage value of the working submodule under different battery SOC.

17. An electronic device comprising a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the method of any one of claims 7 to 16.

18. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method of any one of claims 7 to 16.

Images