Charging and discharging depth determination method of energy storage equipment, electronic equipment and storage medium

Abstract

The invention relates to the technical field of energy storage, particularly provides a charge and discharge depth determination method of energy storage equipment, electronic equipment and a storage medium, and aims to solve the problem of reasonably and reliably determining the charge and discharge depth of an energy storage station. In order to achieve the purpose, the method provided by the invention comprises the following steps: acquiring the total cycle index n of circularly charging and discharging the energy storage equipment; the total effective capacity corresponding to each charge and discharge depth is obtained according to the total cycle number n, and the total effective capacity is the sum of the effective capacities of the energy storage equipment after n times of cycle charge and discharge are carried out on the energy storage equipment according to the charge and discharge depth and the first to nth times of cycle charge and discharge are finished; taking the charging and discharging depth corresponding to the maximum total effective capacity as a candidate charging and discharging depth; and determining a target charge-discharge depth of the energy storage device according to the candidate charge-discharge depth. The charging and discharging depth is determined through the method, the service life of the energy storage equipment can be prolonged, the utilization rate of the energy storage equipment is improved, meanwhile, frequent replacement of the energy storage equipment is avoided, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a method for determining the charge and discharge depth of an energy storage device, an electronic device, and a storage medium. Background Art

[0002] The energy storage station includes multiple energy storage devices (such as batteries). Charging the energy storage device can store electrical energy in the energy storage device, and discharging the energy storage device can provide electrical energy to external loads. For example, in the charging scenario of electric vehicles, an energy storage station can be set up. When the electric vehicle needs to be charged, the energy storage device can be controlled to discharge to supply power to the charging pile, so that the electric vehicle can be charged through the charging pile; when the electric vehicle does not need to be charged, the energy storage device can be controlled to charge, and the electrical energy provided by the power grid can be stored in the energy storage device.

[0003] At present, the operation control methods for energy storage stations do not consider the impact of the depth of charge and discharge (DOD) on energy storage equipment. They mainly determine a charge and discharge depth based on manual experience, and then charge and discharge the energy storage equipment according to the determined charge and discharge depth. If the set charge and discharge depth is relatively large, the energy storage equipment will be in a deep discharge state when discharging. Being in a deep discharge state for a long time will seriously damage the chemical structure inside the battery, greatly reduce the number of battery charge and discharge cycles, and affect the battery life; because the battery life is affected, the battery needs to be replaced frequently, which will increase the operation and maintenance costs. If the set charge and discharge depth is relatively small, the energy storage equipment cannot be fully utilized, resulting in a waste of resources.

[0004] Accordingly, the art needs a new technical solution to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present application is proposed to solve or at least partially solve the technical problem of how to reasonably and reliably determine the charge and discharge depth of an energy storage station so as to improve the utilization rate of the energy storage equipment, extend the life of the energy storage equipment, and reduce the operation and maintenance costs.

[0006] In a first aspect, a method for determining a charge and discharge depth of an energy storage device is provided, the method comprising:

[0007] Set multiple different charge and discharge depths;

[0008] Obtain the total number of cycles n of cyclic charging and discharging of the energy storage device;

[0009] According to the total number of cycles n, respectively obtain the total effective capacity corresponding to each of the charge and discharge depths, the total effective capacity being the sum of the effective capacities of the energy storage device at the end of the first to nth cycles of charge and discharge after the energy storage device is charged and discharged n times according to the charge and discharge depth;

[0010] The charge-discharge depth corresponding to the maximum total effective capacity is taken as a candidate charge-discharge depth;

[0011] A target charge and discharge depth of the energy storage device is determined according to the candidate charge and discharge depths.

[0012] In a technical solution of the above-mentioned method for determining the charge and discharge depth, the energy storage device is arranged in an energy storage station, and the step of obtaining the total number of cycles n of cyclic charge and discharge of the energy storage device includes:

[0013] Acquire station data of the energy storage station, the station data including a first operating time of the energy storage station and a charge and discharge strategy of the energy storage device, the charge and discharge strategy including a total number of cycles t1 of cyclic charge and discharge of the energy storage device within a second operating time, the second operating time being less than the first operating time;

[0014] According to the first operating time, the second operating time and the total cycle number t1, obtaining the total cycle number t2 of cyclic charging and discharging of the energy storage device within the first operating time;

[0015] According to the total number of cycles t2, the total number of cycles n is obtained.

[0016] In a technical solution of the above-mentioned method for determining the depth of charge and discharge, the first operating time is greater than or equal to 1 year, and the second operating time is 1 day.

[0017] In one technical solution of the above-mentioned method for determining the depth of charge and discharge, the total number of cycles n is greater than or equal to the total number of cycles t2.

[0018] In a technical solution of the above-mentioned method for determining the charge and discharge depth, obtaining the total effective capacity corresponding to each charge and discharge depth according to the total number of cycles n includes:

[0019] Obtaining a fitting function, wherein the fitting function represents a corresponding relationship between the charge and discharge depth, the number of cycles, and the effective capacity of the energy storage device, wherein the number of cycles is the number of cycles of cyclic charge and discharge of the energy storage device according to the charge and discharge depth, and the effective capacity is the effective capacity of the energy storage device after completing the cyclic charge and discharge of the number of cycles;

[0020] The charge and discharge depth and the cycle number i are used as inputs of the fitting function, and the effective capacity of the energy storage device after completing the i-th cycle of charge and discharge is obtained through the fitting function, i=1, ...n;

[0021] The total effective capacity corresponding to the charge and discharge depth is obtained according to the sum of the effective capacities of the energy storage device after the 1st to nth cycles of charge and discharge.

[0022] In one technical solution of the above-mentioned method for determining the charge and discharge depth, the fitting function is obtained by:

[0023] Acquire a plurality of capacity decay curves corresponding to different charge and discharge depths, wherein the capacity decay curve is a relationship curve between the number of cycles and the effective capacity of the energy storage device when the energy storage device is cyclically charged and discharged according to the charge and discharge depths, wherein the number of cycles is the number of cyclic charge and discharge, and the effective capacity is the effective capacity of the energy storage device after completing the cyclic charge and discharge for the number of cycles;

[0024] Function fitting is performed according to the capacity decay curves corresponding to the multiple different charge and discharge depths to obtain the fitting function.

[0025] In a technical solution of the above-mentioned method for determining the charge and discharge depth, determining the target charge and discharge depth of the energy storage device according to the candidate charge and discharge depth includes:

[0026] Obtaining a target capacity of the energy storage device;

[0027] Using the target capacity and the candidate charge and discharge depth as inputs of the fitting function, and obtaining, through the fitting function, the number of cycles N when the effective capacity of the energy storage device reaches the target capacity when the energy storage device is cyclically charged and discharged according to the candidate charge and discharge depth;

[0028] If the cycle number N is greater than or equal to the total cycle number n, the candidate charge and discharge depth is used as the target charge and discharge depth.

[0029] In a technical solution of the above-mentioned method for determining the charge and discharge depth, the step of obtaining the target capacity of the energy storage device includes:

[0030] Obtaining a lower limit of the effective capacity of the energy storage device, wherein the lower limit of the effective capacity is used to indicate that the energy storage device needs to be replaced when the effective capacity of the energy storage device is less than the lower limit of the effective capacity;

[0031] The target capacity is obtained according to the lower limit of the effective capacity.

[0032] In a second aspect, an electronic device is provided, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method described in any one of the technical solutions of the method for determining the depth of charge and discharge of the energy storage device is implemented.

[0033] In a third aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored therein, wherein the program codes are suitable for being loaded and run by a processor to execute the method described in any one of the technical solutions of the method for determining the depth of charge and discharge of the energy storage device described above.

[0034] The above one or more technical solutions of the present application have at least one or more of the following beneficial effects:

[0035] In a technical solution of a method for determining a charge and discharge depth of an energy storage device provided in the present application, a plurality of different charge and discharge depths may be set; a total number of cycles n for cyclic charge and discharge of the energy storage device is obtained; based on the total number of cycles n, a total effective capacity corresponding to each charge and discharge depth is obtained respectively, the total effective capacity being the sum of the effective capacities of the energy storage device at the end of the first to nth charge and discharge cycles after the energy storage device is charged and discharged n times according to the charge and discharge depth; a charge and discharge depth corresponding to the largest total effective capacity is taken as a candidate charge and discharge depth; and a target charge and discharge depth of the energy storage device is determined based on the candidate charge and discharge depths.

[0036] The higher the total effective capacity, the better the effect of cyclic charge and discharge, the healthier the energy storage device and the higher the utilization rate. Therefore, by determining the charge and discharge depth through the above implementation scheme, the life of the energy storage device can be extended, the utilization rate of the energy storage device can be improved, and the frequent replacement of the energy storage device can be avoided, thus reducing the operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Among them:

[0038] Figure 1 It is a flowchart of the main steps of a method for determining the charge and discharge depth of an energy storage device according to an embodiment of the present application;

[0039] Figure 2 This is a schematic flow chart of the main steps of obtaining the total number of cycles n of cyclic charging and discharging of an energy storage device according to an embodiment of the present application;

[0040] Figure 3This is a schematic flow chart of the main steps of obtaining the total effective capacity corresponding to each charge and discharge depth according to an embodiment of the present application;

[0041] Figure 4 is a schematic diagram of a capacity decay curve according to an embodiment of the present application;

[0042] Figure 5 It is a flowchart of the main steps of determining the target charge and discharge depth of the energy storage device according to an embodiment of the present application;

[0043] Figure 6 is a flow chart of main steps of a method for determining the charge and discharge depth of an energy storage device according to another embodiment of the present application;

[0044] Figure 7 It is a schematic diagram of the main structure of an electronic device according to an embodiment of the present application.

[0045] Reference numerals:

[0046] 11: memory; 12: processor. DETAILED DESCRIPTION

[0047] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0048] In the description of this application, "processor" may include hardware, software or a combination of the two. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc.

[0049] The following is a description of an embodiment of a method for determining the charge and discharge depth of an energy storage device provided in the present application.

[0050] See attached Figure 1 , Figure 1 1 is a flow chart of the main steps of a method for determining the charge and discharge depth of an energy storage device according to an embodiment of the present application. Figure 1 As shown, the method for determining the charge and discharge depth of the energy storage device in the embodiment of the present application mainly includes the following steps S101 to S105.

[0051] Step S101: setting a plurality of different depths of charge and discharge (DOD).

[0052] This embodiment does not specifically limit the number and value of the charge and discharge depths. For example, eight different charge and discharge depths can be set, namely 100%, 90%, 80%, 70%, 50%, 40%, 25%, and 10%.

[0053] Step S102: Obtain the total number of cycles n of cyclic charging and discharging of the energy storage device.

[0054] A charge and discharge cycle includes a charging phase and a discharging phase, that is, charging first and then discharging.

[0055] The cyclic charge and discharge can be understood as multiple consecutive charge and discharge. In the process of cyclic charge and discharge, one charge and discharge can be understood as one cyclic charge and discharge. The total number of cycles n can be understood as the total number of charge and discharge in the process of cyclic charge and discharge.

[0056] Step S103: According to the total number of cycles n, the total effective capacity corresponding to each charge and discharge depth is obtained respectively. The total effective capacity is the sum of the effective capacities of the energy storage device at the end of the first to nth cycles of charge and discharge after the energy storage device is charged and discharged for n cycles according to the charge and discharge depth.

[0057] In the process of charging and discharging the energy storage device n times, the effective capacity of the energy storage device can be obtained at the end of each cycle of charging and discharging, so that n effective capacities can be obtained, and then the n effective capacities are accumulated together to obtain the total effective capacity.

[0058] The effective capacity is the amount of electricity actually released by the energy storage device at the end of a cycle of charge and discharge. Therefore, the effective capacity can also be understood as the actual capacity of the energy storage device. The larger the effective capacity, the better the performance of the energy storage device, and the smaller the effective capacity, the worse the performance of the energy storage device. The larger the total effective capacity, the better the performance of the energy storage device during the entire cycle of charge and discharge, the healthier the energy storage device, and the better the utilization rate; conversely, it indicates that the performance of the energy storage device is worse, the less healthy it is, and the worse the utilization rate.

[0059] The total effective capacity corresponding to the charge and discharge depth can be understood as the total effective capacity obtained by the above method when the energy storage device is charged and discharged for n cycles according to the charge and discharge depth.

[0060] Step S104: taking the charge-discharge depth corresponding to the maximum total effective capacity as a candidate charge-discharge depth.

[0061] The total effective capacities corresponding to the various charge and discharge depths are compared, the largest total effective capacity is selected, and the charge and discharge depth corresponding to the largest total effective capacity is used as a candidate charge and discharge depth.

[0062] Step S105: Determine the target charge and discharge depth of the energy storage device according to the candidate charge and discharge depths.

[0063] The target charge and discharge depth can be understood as the charge and discharge depth actually used for the energy storage device. After the target charge and discharge depth is determined, the energy storage device will be charged and discharged according to the target charge and discharge depth. In this embodiment, the candidate charge and discharge depth can be used as the target charge and discharge depth.

[0064] Based on the method described in steps S101 to S105 above, the total effective capacity of the energy storage device can be used to screen the charge and discharge depth. The energy storage device is charged and discharged based on the screened charge and discharge depth, which can extend the life of the energy storage device and improve the utilization rate of the energy storage device. At the same time, frequent replacement of energy storage devices is avoided, reducing operation and maintenance costs.

[0065] The above-mentioned steps S102, S103 and S105 are described below.

[0066] 1. Explain step S102.

[0067] In some implementations of the above step S102, the energy storage device is arranged in the energy storage station, that is, the energy storage device is an energy storage device in the energy storage station. Figure 2 The following steps S1021 to S1023 shown in the figure are used to obtain the total number of cycles n of cyclic charging and discharging of the energy storage device.

[0068] Step S1021: Acquire the station data of the energy storage station, the station data includes the first operation time of the energy storage station and the charge and discharge strategy of the energy storage device, the charge and discharge strategy includes the total number of cycles t1 of the energy storage device to perform cyclic charge and discharge in the second operation time, and the second operation time is less than the first operation time. In addition, the charge and discharge strategy may also include parameters such as charging voltage, charging current, discharge voltage, and discharge current, and this embodiment does not specifically limit the types and values ​​of these parameters.

[0069] The first operating duration can be understood as the expected operating duration of the energy storage station. In some embodiments, the first operating duration is greater than or equal to 1 year, and the second operating duration is 1 day.

[0070] Step S1022: According to the first operating time, the second operating time and the total cycle number t1, the total cycle number t2 of cyclic charge and discharge of the energy storage device within the first operating time is obtained.

[0071] Specifically, the ratio of the first running time to the second running time may be obtained, and then the product of the ratio and the total number of cycles t1 may be obtained, and the total number of cycles t2 may be obtained according to the product.

[0072] For example, the first operating time is 1 year, the second operating time is 1 day, and the total number of cycles of cyclic charge and discharge of the energy storage device within 1 day is t1=m, then the total number of cycles in 2024 is t2=m×366.

[0073] Step S1023: Obtain the total number of cycles n according to the total number of cycles t2.

[0074] In this embodiment, the total cycle number t2 can be used as the total cycle number n, or the total cycle number t2 can be increased and then the increased total cycle number t2 can be used as the total cycle number n, that is, the total cycle number n is greater than or equal to the total cycle number t2.

[0075] Based on the method described in steps S1021 to S1023 above, the expected operating time of the energy storage station can be taken into consideration when determining the charge and discharge depth of the energy storage device in the energy storage station. In this way, when the energy storage device is charged and discharged according to the determined charge and discharge depth, the life of the energy storage device can be made greater than or equal to the expected operating time of the energy storage station, so that the energy storage station can not only exert the best energy storage performance within the expected operating time, but also reduce the operation and maintenance cost of the energy storage station.

[0076] 2. Explain step S103.

[0077] In some implementations of the above step S103, Figure 3 The following steps S1031 to S1033 are used to obtain the total effective capacity corresponding to each charge and discharge depth.

[0078] Step S1031: obtaining a fitting function, where the fitting function represents the corresponding relationship between the charge and discharge depth, the number of cycles and the effective capacity of the energy storage device.

[0079] The number of cycles refers to the number of cycles of cyclic charge and discharge of the energy storage device according to the charge and discharge depth, and the effective capacity refers to the effective capacity of the energy storage device after completing the cyclic charge and discharge of the number of cycles.

[0080] In this embodiment, the energy storage device can be subjected to a charge and discharge test. The test parameters of the charge and discharge test may include a charge and discharge depth D and a cycle number t, where t=1, ..., T. The energy storage device is cyclically charged and discharged according to the charge and discharge depth D to obtain the effective capacity q of the energy storage device at the end of the 1st to Tth cycle charge and discharge. 1 ,…,q T Then, the above charge and discharge depth D, cycle number 1,…,T, effective capacity q 1 ,…,q TA set of corresponding relationships (hereinafter described as test data) is established. By changing the value of the charge and discharge depth D in the test parameters, multiple sets of different test data can be obtained, and function fitting can be performed on these test data to obtain a fitting function. In this embodiment, a conventional function fitting method can be used to fit the above test data, for example, a polynomial fitting method can be used to fit the function.

[0081] In some embodiments, the number of cycles 1, ..., T, the effective capacity q in each set of test data can be respectively 1 ,…,q T Perform function fitting to obtain the sub-function corresponding to the charge-discharge depth D in each set of test data, and then combine the sub-functions corresponding to the charge-discharge depth D in all test data to form a fitting function. For example, if m charge-discharge depths are set, and the sub-functions corresponding to these m charge-discharge depths are f1, ..., fm, then the fitting function can be expressed as (f1, ..., fm).

[0082] It should be noted that the fitting function is pre-fitted. When it is necessary to obtain the total effective capacity corresponding to the charge and discharge depth, the fitting function is directly used without first obtaining the above-mentioned test data, fitting the function according to the above-mentioned test data, and then obtaining the total effective capacity corresponding to the charge and discharge depth according to the fitting function.

[0083] Step S1032: using the charge and discharge depth and the cycle number i as inputs of the fitting function, and obtaining the effective capacity of the energy storage device after completing the i-th cycle of charge and discharge through the fitting function, i=1, ...n.

[0084] In some embodiments, the effective capacity is expressed as q=f(i), where f represents the fitting function.

[0085] In some embodiments, if the fitting function is a combination of sub-functions (f1, ..., fm) corresponding to multiple charge and discharge depths D, the sub-function corresponding to the charge and discharge depth can be first queried from the fitting function (f1, ..., fm), and then the number of cycles i is used as the input of this sub-function, and the effective capacity of the energy storage device after completing the i-th cycle of charge and discharge is obtained through this sub-function, i = 1, ... n. In the above method embodiment, the charge and discharge depth set in step S101 is one or more of the above multiple charge and discharge depths D.

[0086] Step S1033: Obtain the total effective capacity corresponding to the charge and discharge depth according to the sum of the effective capacities of the energy storage device after the 1st to nth cycles of charge and discharge.

[0087] In some embodiments, the total available capacity is expressed as

[0088] Based on the method described in steps S1031 to S1033 above, the total effective capacity corresponding to the charge and discharge depth can be obtained conveniently and accurately using the fitting function.

[0089] The fitting method of the fitting function is further explained below.

[0090] In some embodiments, a capacity decay curve can be used to represent the corresponding relationship between the charge and discharge depth, the number of cycles and the effective capacity of the energy storage device, that is, the above test data is a capacity decay curve, and a function fitting is performed on the capacity decay curve to obtain a fitting function.

[0091] Specifically, the fitting function can be obtained by fitting through the following steps 11 and 12.

[0092] Step 11: Obtain capacity decay curves corresponding to multiple different charge and discharge depths.

[0093] The capacity decay curve is a relationship curve between the number of cycles and the effective capacity of the energy storage device when the energy storage device is cyclically charged and discharged according to the charge and discharge depth. The number of cycles is the number of cyclic charge and discharge, and the effective capacity is the effective capacity of the energy storage device after completing the cyclic charge and discharge for the number of cycles.

[0094] See attached Figure 4 , Figure 4 The capacity decay curve corresponding to the charge and discharge depth is shown as an example, with the horizontal axis representing the number of charge and discharge cycles (i.e., the number of cycles) and the vertical axis representing the effective capacity. The charge and discharge depth includes 100%, 90%, 80%, 70%, 50%, 40%, 25%, and 10%. Figure 4 As shown in the figure, as the number of cycles increases, the effective capacity of the energy storage device gradually decreases. The gradual decrease in effective capacity can also be understood as the gradual attenuation of capacity. The greater the depth of charge and discharge, the faster the capacity decays, which will shorten the life of the energy storage device; conversely, the slower the capacity decays, reducing the impact on the life of the energy storage device.

[0095] Step 12: Perform function fitting based on the capacity decay curves corresponding to multiple different charge and discharge depths to obtain a fitting function.

[0096] In some embodiments, function fitting can be performed in the following manner:

[0097] Function fitting is performed on the capacity decay curve corresponding to each charge and discharge depth to obtain a sub-function corresponding to each charge and discharge depth, and then the sub-functions corresponding to all charge and discharge depths are combined to obtain a fitting function. When performing function fitting on the capacity decay curve, a conventional curve fitting method can be used for fitting. This embodiment does not specifically limit the principle and process of the curve fitting method.

[0098] The sub-function corresponding to the charge and discharge depth can be expressed as f(i)*DOD, where DOD represents the charge and discharge depth and i represents the number of cycles. Based on this, the total effective capacity corresponding to the charge and discharge depth is expressed as

[0099] Based on the method described in steps 11 to 12 above, the capacity decay curve corresponding to the charge and discharge depth can be used to accurately fit the fitting function, which is conducive to improving the accuracy of obtaining the total effective capacity corresponding to each charge and discharge depth.

[0100] 3. Explain step S105.

[0101] In some implementations of the above step S105, Figure 5 The following steps S1051 to S1053 shown in the figure determine the target charge and discharge depth of the energy storage device.

[0102] Step S1051: Obtain the target capacity of the energy storage device.

[0103] In some implementations, the lower limit of the effective capacity of the energy storage device can be obtained. The lower limit of the effective capacity is used to indicate that the energy storage device needs to be replaced when the effective capacity of the energy storage device is less than the lower limit of the effective capacity. The target capacity is obtained according to the lower limit of the effective capacity. Specifically, the lower limit of the effective capacity can be used as the target capacity. Figure 4 As shown, the lower limit of effective capacity is 60%.

[0104] Step S1052: using the target capacity and the candidate charge and discharge depth as inputs of the fitting function, and obtaining the number of cycles N when the effective capacity of the energy storage device reaches the target capacity when the energy storage device is cyclically charged and discharged according to the candidate charge and discharge depth through the fitting function.

[0105] In some embodiments, if the fitting function is a combination of sub-functions (f1, ..., fm) corresponding to multiple charge and discharge depths D, the sub-function corresponding to the candidate charge and discharge depth can be queried from the fitting function (f1, ..., fm), and then the target capacity is used as the input of this sub-function. The number of cycles when the effective capacity of the energy storage device reaches the target capacity is obtained through this sub-function. This number of cycles is also the number of cycles N to be obtained above.

[0106] Step S1053: If the cycle number N is greater than or equal to the total cycle number n, the candidate charge and discharge depth is used as the target charge and discharge depth.

[0107] Otherwise, for the remaining charge and discharge depths except the above-mentioned candidate charge and discharge depths, each charge and discharge depth is taken as a new candidate charge and discharge depth in order from large to small according to the total effective capacity corresponding to each charge and discharge depth, and the number of cycles N of each new candidate charge and discharge depth is obtained in turn, until it is determined that the number of cycles N of a candidate charge and discharge depth is greater than or equal to the total number of cycles n, and this candidate charge and discharge depth is taken as the target charge and discharge depth.

[0108] Based on the method described in steps S1051 to S1053 above, it can be ensured that after the energy storage device is charged and discharged for n cycles according to the target charge and discharge depth, the effective capacity of the energy storage device is still greater than or equal to the target capacity. If the target capacity is the lower limit of the effective capacity, the energy storage device can still be used after n cycles of charge and discharge without replacement.

[0109] The following is combined with Figure 6 , an embodiment of the method for determining the charge and discharge depth of the energy storage device provided in this application is described. Figure 6 As shown, the charge and discharge depth of the energy storage device can be determined through the following steps S201 to S205.

[0110] Step S201: Acquire the station data of the energy storage station.

[0111] The station data includes the first operating time of the energy storage station and the charge and discharge strategy of the energy storage device. The charge and discharge strategy includes the total number of cycles t1 of cyclic charge and discharge of the energy storage device within the second operating time. The second operating time is less than the first operating time.

[0112] Step S202: Obtain a fitting function.

[0113] The fitting function represents the corresponding relationship between the charge-discharge depth, the number of cycles and the effective capacity of the energy storage device. The number of cycles is the number of cycles of cyclic charge and discharge of the energy storage device according to the charge-discharge depth, and the effective capacity is the effective capacity of the energy storage device after completing the cyclic charge and discharge of the number of cycles.

[0114] Step S203: Obtain the total effective capacity corresponding to each charge and discharge depth according to the fitting function.

[0115] The charge and discharge depth and the number of cycles i are used as the input of the fitting function, and the effective capacity of the energy storage device after completing the i-th cycle of charge and discharge is obtained through the fitting function, i = 1, ... n. The total effective capacity corresponding to the charge and discharge depth is obtained according to the sum of the effective capacities of the energy storage device after the 1st to nth cycles of charge and discharge.

[0116] Step S204: taking the charge-discharge depth corresponding to the maximum total effective capacity as a candidate charge-discharge depth.

[0117] Step S205: Determine the target charge and discharge depth of the energy storage device according to the candidate charge and discharge depths.

[0118] The implementation methods of each step in the above-mentioned step S201 to step S205 are respectively the same as the same methods in the above-mentioned method embodiments. The methods based on the above-mentioned steps S201 to step S205 can reasonably and reliably determine the charge and discharge depth of the energy storage device. Charging and discharging the energy storage device based on the charge and discharge depth can extend the life of the energy storage device and improve the utilization rate of the energy storage device. At the same time, it avoids frequent replacement of energy storage devices and reduces operation and maintenance costs.

[0119] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effect of the present application, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders. These adjusted schemes are equivalent to the technical schemes described in this application, and therefore will also fall within the scope of protection of this application.

[0120] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiment of the present application can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.

[0121] Another aspect of the present application also provides a computer-readable storage medium.

[0122] In an embodiment of a computer-readable storage medium according to the present application, the computer-readable storage medium may be configured to store a program for executing a method for determining the charge and discharge depth of an energy storage device in the above-mentioned method embodiment, and the program may be loaded and run by a processor to implement the method for determining the charge and discharge depth of the above-mentioned energy storage device. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The computer-readable storage medium may be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present application is a non-temporary computer-readable storage medium.

[0123] Another aspect of the present application provides an electronic device.

[0124] In an embodiment of an electronic device according to the present application, the electronic device may include at least one processor; and a memory connected to the at least one processor in communication; wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method described in any of the above embodiments is implemented. Figure 7 , Figure 7 It is exemplarily shown that the memory 11 and the processor 12 are communicatively connected via a bus.

[0125] The electronic device described in this application may be, but is not limited to, a tablet computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, a vehicle-mounted device, an ultra-mobile personal computer (UMPC), a netbook, and a personal digital assistant (PDA).

[0126] So far, the technical solution of the present application has been described in conjunction with an embodiment shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A method for determining the charge and discharge depth of an energy storage device, characterized in that: The method comprises: Set multiple different charge and discharge depths; Obtain the total number of cycles n of cyclic charging and discharging of the energy storage device; According to the total number of cycles n, respectively obtain the total effective capacity corresponding to each of the charge and discharge depths, the total effective capacity being the sum of the effective capacities of the energy storage device at the end of the first to nth cycles of charge and discharge after the energy storage device is charged and discharged n times according to the charge and discharge depth; The charge-discharge depth corresponding to the maximum total effective capacity is taken as a candidate charge-discharge depth; A target charge and discharge depth of the energy storage device is determined according to the candidate charge and discharge depths.

2. The method according to claim 1, characterized in that The energy storage device is arranged in the energy storage station, and the obtaining of the total number of cycles n of cyclic charging and discharging of the energy storage device comprises: Acquire station data of the energy storage station, the station data including a first operating time of the energy storage station and a charge and discharge strategy of the energy storage device, the charge and discharge strategy including a total number of cycles t1 of cyclic charge and discharge of the energy storage device within a second operating time, the second operating time being less than the first operating time; According to the first operating time, the second operating time and the total cycle number t1, obtaining the total cycle number t2 of cyclic charging and discharging of the energy storage device within the first operating time; According to the total number of cycles t2, the total number of cycles n is obtained.

3. The method according to claim 2, characterized in that The first operating time is greater than or equal to 1 year, and the second operating time is 1 day.

4. The method according to claim 2, characterized in that: The total number of cycles n is greater than or equal to the total number of cycles t2.

5. The method according to claim 1, characterized in that The obtaining, according to the total number of cycles n, the total effective capacity corresponding to each of the charge and discharge depths, comprises: Obtaining a fitting function, wherein the fitting function represents a corresponding relationship between the charge and discharge depth, the number of cycles, and the effective capacity of the energy storage device, wherein the number of cycles is the number of cycles of cyclic charge and discharge of the energy storage device according to the charge and discharge depth, and the effective capacity is the effective capacity of the energy storage device after completing the cyclic charge and discharge of the number of cycles; The charge and discharge depth and the cycle number i are used as inputs of the fitting function, and the effective capacity of the energy storage device after completing the i-th cycle of charge and discharge is obtained through the fitting function, i=1, ...n; The total effective capacity corresponding to the charge and discharge depth is obtained according to the sum of the effective capacities of the energy storage device after the 1st to nth cycles of charge and discharge.

6. The method according to claim 5, characterized in that The fitting function is obtained in the following way: Acquire a plurality of capacity decay curves corresponding to different charge and discharge depths, wherein the capacity decay curve is a relationship curve between the number of cycles and the effective capacity of the energy storage device when the energy storage device is cyclically charged and discharged according to the charge and discharge depths, wherein the number of cycles is the number of cyclic charge and discharge, and the effective capacity is the effective capacity of the energy storage device after completing the cyclic charge and discharge for the number of cycles; Function fitting is performed according to the capacity decay curves corresponding to the multiple different charge and discharge depths to obtain the fitting function.

7. The method according to claim 5, characterized in that The step of determining a target charge / discharge depth of the energy storage device according to the candidate charge / discharge depths includes: Obtaining a target capacity of the energy storage device; Using the target capacity and the candidate charge and discharge depth as inputs of the fitting function, and obtaining, through the fitting function, the number of cycles N when the effective capacity of the energy storage device reaches the target capacity when the energy storage device is cyclically charged and discharged according to the candidate charge and discharge depth; If the cycle number N is greater than or equal to the total cycle number n, the candidate charge and discharge depth is used as the target charge and discharge depth.

8. The method according to claim 7, characterized in that The obtaining of the target capacity of the energy storage device includes: Obtaining a lower limit of the effective capacity of the energy storage device, wherein the lower limit of the effective capacity is used to indicate that the energy storage device needs to be replaced when the effective capacity of the energy storage device is less than the lower limit of the effective capacity; The target capacity is obtained according to the lower limit of the effective capacity.

9. An electronic device, characterized in that: include: at least one processor; and, a memory communicatively coupled to the at least one processor; Wherein, a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method for determining the charge and discharge depth of the energy storage device according to any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the method for determining the charge and discharge depth of an energy storage device according to any one of claims 1 to 8.

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