Method, device and equipment for correcting SOH value of energy storage battery system and storage medium

Abstract

The invention relates to an energy storage battery system SOH value correction method and device, equipment and a storage medium. According to the main technical scheme, the method comprises the following steps: obtaining a corrected charging initial SOC value, a single-time accumulated charging capacity actual value and a rated capacity value of the energy storage battery system, and obtaining an initial estimated SOH value of the energy storage battery system according to the rated capacity value, the corrected charging initial SOC value and the single-time accumulated charging capacity actual value; acquiring a summarized accumulated charging capacity actual value, an average temperature value and a historical correction factor value of the SOH of the energy storage battery system in the whole cycle, and obtaining an updated correction factor value of the SOH of the energy storage battery system according to a preset SOH standard table, the historical correction factor value, the initial estimated SOH value and the summarized accumulated charging capacity actual value; and according to a preset SOH standard table, summarizing the actual value of the accumulated charging capacity, updating the correction factor value and the average temperature value, and obtaining a correction value of the SOH of the energy storage battery system. The method can achieve the effect of improving the estimation precision of the SOH value of the energy storage battery system.

Description

Technical Field

[0001] This application relates to the field of energy storage battery technology, and in particular to a method, apparatus, device and storage medium for correcting the state of harm (SOH) of an energy storage battery system. Background Technology

[0002] As is well known, during the operation of an energy storage battery system, the overall usable capacity of the battery system after a single charge / discharge cycle gradually decreases as the cumulative charge / discharge capacity increases throughout its entire lifespan. The State of Health (SOH) value is the most direct parameter reflecting this situation. Specifically, the SOH value is the ratio of the current usable capacity of the energy storage battery system to its rated capacity.

[0003] In traditional methods, the estimation of State of Harm (SOH) value typically involves first conducting long-term charge / discharge tests on the energy storage battery system at room temperature (25°C) in a laboratory. The capacity data for each complete charge / discharge cycle is then collected and compiled into a table, obtaining a curve showing the decrease in single-cycle capacity as the number of cycles or cumulative charge / discharge capacity increases. This table represents the correlation between the cumulative charge / discharge capacity of the energy storage battery system and its SOH value. Subsequently, by continuously monitoring the cumulative charge / discharge capacity of the energy storage battery system in real time and then referring back to the SOH value correlation table, the corresponding SOH value can be obtained.

[0004] However, the temperature of an energy storage battery system fluctuates during operation, and these temperature variations can significantly impact the estimation of the State of Health (SOH) value. The SOH value curve table for 25°C is obtained after long-term charge / discharge cycles under constant temperature and current conditions. However, actual field operating conditions are far harsher than laboratory conditions and cannot perfectly match a 25°C environment. Therefore, simply referring to the SOH value curve table for 25°C based on the accumulated charge / discharge capacity cannot cover all operating temperature ranges, thus failing to effectively assess the actual SOH state of the energy storage battery system. This results in errors in the obtained SOH value, adversely affecting the subsequent lifespan assessment and operation and maintenance of the entire energy storage battery system. Summary of the Invention

[0005] Based on this, this application provides a method, apparatus, device, and storage medium for correcting the SOH value of an energy storage battery system. By acquiring the corrected initial SOC value, actual value of single cumulative charging capacity, actual value of aggregated cumulative charging capacity, average temperature value, and historical correction factor value of the energy storage battery system, and combining them with the rated capacity value of the energy storage battery system and a preset SOH standard table, the corrected SOH value of the energy storage battery system is obtained. This enables the establishment of an SOH correction model applicable to a wide temperature range based on the 25℃ SOH standard table, thereby improving the accuracy of SOH estimation of the energy storage battery system across the entire temperature range and the effectiveness of assessing the lifespan of the energy storage battery system.

[0006] Firstly, a method for correcting the state of harm (SOH) value of an energy storage battery system is provided, the method comprising: Obtain the corrected starting SOC value and the actual value of the single cumulative charging capacity of the energy storage battery system. The corrected starting SOC value refers to the starting SOC value before the full charging operation is performed after discharging the energy storage battery system before correcting it. Obtain the rated capacity value of the energy storage battery system, and based on the rated capacity value, the corrected initial SOC value, and the actual value of the single cumulative charging capacity, obtain the initial estimated SOH value of the energy storage battery system. Obtain the actual value of the cumulative charging capacity and the average temperature value of the energy storage battery system throughout its entire life cycle; Obtain the historical correction factor value of SOH of the energy storage battery system. Based on the preset SOH standard table, historical correction factor value, initial estimated SOH value, and the actual value of the cumulative charging capacity, obtain the updated correction factor value of SOH of the energy storage battery system. Based on the preset SOH standard table, the actual value of the cumulative charging capacity, the updated correction factor value, and the average temperature value, the correction value of the SOH of the energy storage battery system is obtained.

[0007] According to one feasible method in the embodiments of this application, the initial estimated SOH value of the energy storage battery system is obtained based on the rated capacity value, the corrected initial SOC value, and the actual value of the single cumulative charging capacity, including: Based on the corrected initial SOC value and the actual value of the single cumulative charging capacity, the estimated full charge capacity of the energy storage battery system is obtained. Based on the rated capacity and the estimated full-charge capacity, the initial estimated SOH value of the energy storage battery system is obtained.

[0008] According to one feasible method in the embodiments of this application, the updated correction factor value of the SOH of the energy storage battery system is obtained based on a preset SOH standard table, historical correction factor values, initial estimated SOH values, and the actual value of the accumulated charging capacity, including: Based on the preset SOH standard table and the initial estimated SOH value, the theoretical value of the total cumulative charging capacity of the energy storage battery system is obtained; Based on the sum of the theoretical value of cumulative charging capacity, the average temperature value, and the actual value of cumulative charging capacity, the initial correction factor value of SOH of the energy storage battery system is obtained. The updated correction factor value is obtained based on the historical correction factor value and the initial correction factor value.

[0009] According to one feasible method in the embodiments of this application, the correction value of the SOH of the energy storage battery system is obtained based on a preset SOH standard table, the summarized actual value of cumulative charging capacity, the updated correction factor value, and the average temperature value, including: The corrected value of the charging capacity of the energy storage battery system is obtained by summarizing the actual value of the cumulative charging capacity, updating the correction factor value, and the average temperature value. Based on the preset SOH standard table and the charging capacity correction value, the correction value of SOH for the energy storage battery system is obtained.

[0010] According to one feasible embodiment of this application, before correcting the SOH value of the energy storage battery system, the method further includes: Obtain the historical SOH value of the energy storage battery system, as well as the current initial SOC value and current completed SOC value of the energy storage battery system during the current charging process; Based on the rated capacity value, historical SOH value, current initial SOC value, and current completed SOC value, the current cumulative charging capacity of the energy storage battery system is estimated. Obtain the actual value of the current cumulative charging capacity of the energy storage battery system; Based on the current estimated cumulative charging capacity and the current actual cumulative charging capacity, the current capacity estimation error value of the energy storage battery system is obtained; Based on the current capacity estimation error and the preset calibration difference, a correction operation is triggered on the SOH value of the energy storage battery system.

[0011] According to one achievable method in an embodiment of this application, a correction operation for the SOH value of the energy storage battery system is triggered based on the current capacity estimation error value and a preset calibration difference, including: Compare the current capacity estimation error value with the preset calibration difference value; When the current capacity estimation error value is greater than the preset calibration difference value, the energy storage battery system is fully charged for calibration. Obtain the updated cumulative charging capacity estimate and the updated cumulative charging capacity actual value of the energy storage battery system; Based on the actual value of the updated cumulative charging capacity and the estimated value of the updated cumulative charging capacity, the error value of the updated capacity estimation of the energy storage battery system is obtained. Based on the updated capacity estimation error value and the preset calibration difference, a correction operation is triggered on the SOH value of the energy storage battery system.

[0012] According to one achievable method in an embodiment of this application, a correction operation on the SOH value of the energy storage battery system is triggered based on the updated capacity estimation error value and a preset calibration difference, including: The updated capacity estimation error value will be compared with the preset calibration difference value; When the updated capacity estimation error value is less than or equal to the preset calibration difference, the SOH value of the energy storage battery system remains unchanged; When the updated capacity estimation error value is greater than the preset calibration difference, a correction operation on the SOH value of the energy storage battery system is triggered.

[0013] Secondly, a device for correcting the state of harm (SOH) value of an energy storage battery system is provided, the device comprising: The first acquisition unit is used to acquire the corrected charging start SOC value and the actual value of the single cumulative charging capacity of the energy storage battery system. The corrected charging start SOC value refers to the start SOC value before the full charging operation is performed after discharging the energy storage battery system before correcting it. The estimation unit is used to obtain the rated capacity value of the energy storage battery system, and to obtain the initial estimated SOH value of the energy storage battery system based on the rated capacity value, the corrected initial SOC value, and the actual value of the single cumulative charging capacity. The second acquisition unit is used to acquire the actual value of the total cumulative charging capacity and the average temperature value of the energy storage battery system throughout the entire cycle. The update unit is used to obtain the historical correction factor value of the SOH of the energy storage battery system, and to obtain the updated correction factor value of the SOH of the energy storage battery system based on the preset SOH standard table, the historical correction factor value, the initial estimated SOH value, and the actual value of the cumulative charging capacity. The correction unit is used to obtain the correction value of the SOH of the energy storage battery system based on the preset SOH standard table, the actual value of the cumulative charging capacity, the updated correction factor value and the average temperature value.

[0014] Thirdly, a computer device is provided, comprising: At least one processor; and A memory that is communicatively connected to at least one processor; wherein, The memory stores computer instructions that can be executed by at least one processor to enable the at least one processor to perform the methods involved in the first aspect above.

[0015] Fourthly, a computer-readable storage medium is provided having computer instructions stored thereon for causing a computer to perform the methods described in the first aspect above.

[0016] According to the technical content provided in the embodiments of this application, the embodiments of this application obtain the corrected initial SOC value and the actual value of the single cumulative charging capacity of the energy storage battery system; obtain the rated capacity value of the energy storage battery system, and obtain the initial estimated SOH value of the energy storage battery system based on the rated capacity value, the corrected initial SOC value, and the actual value of the single cumulative charging capacity; obtain the total cumulative charging capacity and average temperature value of the energy storage battery system over the entire cycle; obtain the historical correction factor value of the SOH of the energy storage battery system, and obtain the updated correction factor value of the SOH of the energy storage battery system based on the preset SOH standard table, the historical correction factor value, the initial estimated SOH value, and the total cumulative charging capacity; and obtain the corrected value of the SOH of the energy storage battery system based on the preset SOH standard table, the total cumulative charging capacity, the updated correction factor value, and the average temperature value. The above operations obtain the corrected initial SOC value, actual value of single cumulative charging capacity, actual value of aggregated cumulative charging capacity, average temperature value, and historical correction factor value of the energy storage battery system. Combined with the rated capacity value of the energy storage battery system and the preset SOH standard table, the corrected SOH value of the energy storage battery system is obtained. Based on the 25℃ SOH standard table, an SOH correction model applicable to a wide temperature range is established to improve the SOH estimation accuracy of the energy storage battery system across the entire temperature range and the effectiveness of assessing the lifespan of the energy storage battery system. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating a method for correcting the SOH value of an energy storage battery system in one embodiment; Figure 2 This is a schematic diagram of an SOH standard table for a method of correcting the SOH value of an energy storage battery system in one embodiment; Figure 3 This is a schematic diagram of a preferred process for correcting the SOH value of an energy storage battery system in one embodiment; Figure 4 This is a structural block diagram of a device for correcting the SOH value of an energy storage battery system in one embodiment. Figure 5 This is a schematic structural diagram of a computer device in one embodiment. Detailed Implementation

[0018] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the scope of the present application.

[0019] For ease of understanding, the system to which this application applies is first described. This application provides a method for correcting the State of Harm (SOH) value of an energy storage battery system, which can be directly executed by a Battery Management System (BMS) or applied to a computer device, which may include a terminal or a server. Specifically, the computer device can obtain the corrected initial State of Charge (SOC) value and the actual value of the single-cycle cumulative charging capacity of the energy storage battery system; obtain the rated capacity value of the energy storage battery system, and obtain the initial estimated SOH value of the energy storage battery system based on the rated capacity value, the corrected initial SOC value, and the actual value of the single-cycle cumulative charging capacity; obtain the total cumulative charging capacity and average temperature value of the energy storage battery system over the entire cycle; obtain the historical correction factor value of the SOH of the energy storage battery system, and obtain the updated correction factor value of the SOH of the energy storage battery system based on a preset SOH standard table, the historical correction factor value, the initial estimated SOH value, and the total cumulative charging capacity; and obtain the corrected SOH value of the energy storage battery system based on the preset SOH standard table, the total cumulative charging capacity, the updated correction factor value, and the average temperature value.

[0020] Figure 1 This document provides a flowchart of a method for correcting the State of Harm (SOH) value of an energy storage battery system, which can be executed by a BMS or a computer device. Taking BMS execution as an example... Figure 1 As shown, the method may include the following steps: Step S101: Obtain the corrected starting SOC value and the actual value of the single cumulative charging capacity of the energy storage battery system.

[0021] Among them, the SOC value reflects the proportion of the energy storage battery system's currently available power to its total capacity. The corrected charging starting SOC value refers to the initial SOC value before a full charge operation is performed after discharging the energy storage battery system before correction. The actual value of single cumulative charging capacity refers to the total amount of power actually charged into the energy storage battery system during a complete charging process.

[0022] Specifically, as the core component of an energy storage battery system, the BMS is responsible for the comprehensive monitoring, protection, and management of the battery pack to ensure its safety, reliability, and efficient operation. Therefore, during the operation of the energy storage battery system, the BMS can monitor relevant parameters of the charging / discharging process in real time, including the SOC value, temperature, and cumulative charge / discharge capacity. Furthermore, the BMS can obtain the corrected initial SOC value and the actual cumulative charge capacity per charge cycle in real time to facilitate subsequent operations.

[0023] Step S103: Obtain the rated capacity value of the energy storage battery system. Based on the rated capacity value, the corrected initial SOC value and the actual value of the single cumulative charging capacity, obtain the initial estimated SOH value of the energy storage battery system.

[0024] The SOH value refers to the ratio of the currently available capacity of the energy storage battery system to the system's rated capacity. The rated capacity value refers to the nominal amount of electricity that the energy storage battery system can continuously provide under standard test conditions (such as specific temperature, discharge current, and cutoff voltage). This parameter reflects the energy storage capacity of the energy storage battery system under ideal conditions.

[0025] Specifically, the BMS obtains the rated capacity value of the energy storage battery system, and then, based on the rated capacity value, the corrected initial SOC value, and the actual value of the single cumulative charging capacity, obtains the initial estimated SOH value of the energy storage battery system.

[0026] Step S105: Obtain the actual value of the total cumulative charging capacity and the average temperature value of the energy storage battery system throughout the entire cycle.

[0027] The total cumulative charging capacity refers to the total amount of electricity actually charged into the energy storage battery system during the entire charging cycle.

[0028] Here, during the operation of the energy storage battery system, the BMS can monitor relevant parameters of the charging / discharging process in real time. Specifically, the BMS can store the actual value of the cumulative charging capacity, and simultaneously collect temperature data of the energy storage battery system throughout the charging process. Temperature information is collected every t minutes, and the temperature information is statistically stored to form temperature storage data, as shown in the following table:

[0029] The temperature storage data is averaged to obtain the average temperature value, which can then be used... The specific calculation process is as follows: ; It should be noted that the specific time interval t is not limited here and can be reasonably selected based on the actual data storage and computing capabilities of the BMS.

[0030] Step S107: Obtain the historical correction factor value of SOH of the energy storage battery system. Based on the preset SOH standard table, historical correction factor value, initial estimated SOH value, and the actual value of the cumulative charging capacity, obtain the updated correction factor value of SOH of the energy storage battery system.

[0031] The preset SOH standard table, taking a 280AH single-cell energy storage battery as an example, shows the relationship between the cumulative charge / discharge capacity and the SOH value of the energy storage battery system obtained by charging the single-cell energy storage battery at 25°C for an extended period. Figure 2 As shown.

[0032] Specifically, since the SOH (State of Health) of an energy storage battery system undergoes multiple corrections throughout its lifecycle, a corresponding SOH correction value can be obtained each time for further storage. Therefore, the BMS stores historical correction factor values ​​for the SOH of multiple energy storage battery systems. Based on a preset SOH standard table, historical correction factor values, initial estimated SOH values, and the summed cumulative actual charging capacity, an updated correction factor value for the SOH of the energy storage battery system can be obtained.

[0033] Step S109: Based on the preset SOH standard table, the actual value of the cumulative charging capacity, the updated correction factor value, and the average temperature value, obtain the correction value of the SOH of the energy storage battery system.

[0034] Specifically, after obtaining the preset SOH standard table, summarizing the actual value of cumulative charging capacity, updating the correction factor value and the average temperature value, the correction value of the SOH of the energy storage battery system can be further obtained.

[0035] As can be seen, the embodiments of this application obtain the corrected initial SOC value and the actual value of the single cumulative charging capacity of the energy storage battery system; obtain the rated capacity value of the energy storage battery system, and obtain the initial estimated SOH value of the energy storage battery system based on the rated capacity value, the corrected initial SOC value, and the actual value of the single cumulative charging capacity; obtain the total cumulative charging capacity and average temperature value of the energy storage battery system over the entire cycle; obtain the historical correction factor value of the SOH of the energy storage battery system, and obtain the updated correction factor value of the SOH of the energy storage battery system based on the preset SOH standard table, the historical correction factor value, the initial estimated SOH value, and the total cumulative charging capacity; and obtain the corrected value of the SOH of the energy storage battery system based on the preset SOH standard table, the total cumulative charging capacity, the updated correction factor value, and the average temperature value. The above operations obtain the corrected initial SOC value, actual value of single cumulative charging capacity, actual value of aggregated cumulative charging capacity, average temperature value, and historical correction factor value of the energy storage battery system. Combined with the rated capacity value of the energy storage battery system and the preset SOH standard table, the corrected SOH value of the energy storage battery system is obtained. Based on the 25℃ SOH standard table, an SOH correction model applicable to a wide temperature range is established to improve the SOH estimation accuracy of the energy storage battery system across the entire temperature range and the effectiveness of assessing the lifespan of the energy storage battery system.

[0036] The different steps in the above method flow are described in detail below. First, with reference to the embodiment, the step 103 above, "obtaining the initial estimated SOH value of the energy storage battery system based on the rated capacity value, the corrected initial SOC value for charging, and the actual value of the single cumulative charging capacity," will be described in detail.

[0037] Based on the corrected initial SOC value and the actual value of the single cumulative charging capacity, the estimated full-charge capacity of the energy storage battery system is obtained; based on the rated capacity value and the estimated full-charge capacity value, the initial estimated SOH value of the energy storage battery system is obtained.

[0038] Here, when correcting the SOH value of the energy storage battery system, the corrected charging start SOC value can be obtained first. The corrected charging start SOC value refers to the initial SOC value before the full charge operation is performed after discharging the energy storage battery system before correcting it. It is required that the energy storage battery system be discharged to below 20% before the full charge operation is performed.

[0039] Specifically, the SOC value can be adjusted based on the modified initial charging SOC value. n This indicates that the actual value of the cumulative capacity per charge can be expressed as... This means that the estimated full-charge capacity of the energy storage battery system can be obtained using... The specific expression can be represented as follows: = / (100%-SOC n ); It should be noted that the subscript 'n' here represents the nth correction. If the current correction is the first correction, then 'n' is 1, and the specific expression can be represented as follows: = / (100%-SOC1); If the current correction count is the second correction, then n is 2, and the specific expression can be represented as: = / (100%-SOC2), and so on. Since the number of corrections is updated in real time, we will use n times as an example for explanation.

[0040] Based on the rated capacity and the estimated full-charge capacity, the initial estimated state of harm (SOH) value of the energy storage battery system is obtained. Here, the rated capacity value can be used as... This indicates that the initial estimated SOH value can be obtained using... The specific expression can be represented as follows: ; Similarly, the subscript n here can be 1, 2, or 3. n represents the current correction number, and n can take any value.

[0041] The above operations, using the rated capacity value, the corrected initial SOC value, and the actual value of the cumulative capacity per charge, can achieve the SOH estimate of the single charge capacity, that is, the initial estimated SOH value of the energy storage battery system, so as to provide further assurance for the subsequent correction of the SOH value.

[0042] The following describes in detail step S107, namely, "obtaining the updated correction factor value of the SOH of the energy storage battery system based on the preset SOH standard table, historical correction factor values, initial estimated SOH values, and the actual value of the accumulated charging capacity," with reference to the embodiments.

[0043] Based on the preset SOH standard table and the initial estimated SOH value, the theoretical value of the total cumulative charging capacity of the energy storage battery system is obtained; based on the theoretical value of the total cumulative charging capacity, the average temperature value, and the actual value of the total cumulative charging capacity, the initial correction factor value of the SOH of the energy storage battery system is obtained; based on the historical correction factor value and the initial correction factor value, the updated correction factor value is obtained.

[0044] Here, after obtaining the initial estimated SOH value, the theoretical value of the total cumulative charging capacity corresponding to the initial estimated SOH value can be obtained by looking up the preset SOH standard table. Assuming we use... This indicates that the BMS can also directly obtain the actual value of the total cumulative charging capacity of the energy storage battery system, assuming that... Indicates. Due to This refers to the theoretical value corresponding to the initial estimated SOH value at a temperature of 25℃. However, the current temperature is not necessarily 25℃. Therefore, under the influence of temperature factors, The value may generally be less than At this point, a correction factor can be added to make adjustments.

[0045] Specifically, the initial correction factor value for the State of Charge (SOH) of the energy storage battery system can be obtained based on the summed theoretical value of the cumulative charging capacity, the average temperature value, and the summed actual value of the cumulative charging capacity. The specific expression can be represented as follows: ; The subscript n can be 1, 2, or 3. n.

[0046] It should be noted that because energy storage battery systems undergo multiple State of Health (SOH) corrections throughout their lifespan, each correction has a corresponding correction factor value, which can be used... This indicates that the BMS handles each... All are stored, and the correction factor value stored for the first time can be represented as: The correction factor value stored a second time can represent That is, multiple historical correction factor values, up to the nth time, i.e., the current correction factor value stored. Since the validity of each correction factor value needs to be considered, and given that the latest correction factor value has greater reference value, a weighted algorithm can be used to increase the weighting influence of the latest charging data and decrease the weighting influence of the old data to obtain the updated correction factor value. Specifically, based on the historical correction factor values ​​and the initial correction factor value, combined with the weighted algorithm, the updated correction factor value is obtained. The specific expression can be represented as follows: ; The subscript n can be 1, 2, or 3. n. Therefore The charge and discharge capacity of the energy storage battery system is corrected until the (n+1)th SOH value correction is triggered.

[0047] It should also be emphasized that if the current correction is the first correction, the BMS will not be able to obtain historical correction factor values. This means that historical correction factor values ​​do not exist in the database. ,but That is equal to .

[0048] If the current correction is the second correction, then the above expression can be transformed into: ; In this way This allows for effective estimation of the State of Harm (SOH) value of subsequent energy storage battery systems until a third SOH value correction is triggered. Before the third SOH value correction, this method can be used... Replace the original value The value, as the update Store it.

[0049] The above operations, based on the preset SOH standard table, historical correction factor values, initial estimated SOH values, and the actual value of the accumulated charging capacity, obtain the updated correction factor value of the SOH of the energy storage battery system. This updated correction factor value can then be used to correct the SOH value of the energy storage battery system. Simultaneously, by acquiring historical correction factor values, the weighted influence of recent charging data is increased, while the weighted influence of outdated data is reduced, making the obtained updated correction factor value more accurate, thereby improving the accuracy of SOH value estimation.

[0050] Finally, the above step S109, namely "obtaining the correction value of SOH of the energy storage battery system based on the preset SOH standard table, the summarizing of the actual value of the cumulative charging capacity, the updated correction factor value and the average temperature value", will be described in detail with reference to the embodiments.

[0051] Based on the summed cumulative actual charging capacity value, updated correction factor value, and average temperature value, the charging capacity correction value of the energy storage battery system is obtained; based on the preset SOH standard table and the charging capacity correction value, the SOH correction value of the energy storage battery system is obtained.

[0052] Specifically, the corrected charging capacity value of the energy storage battery system can be obtained by summarizing the actual cumulative charging capacity value, updating the correction factor value, and the average temperature value. The specific expression can be represented as follows: ; The corrected SOH value for the energy storage battery system is obtained based on the preset SOH standard table and the charging capacity correction value. In other words, after obtaining the charging capacity correction value, the corrected SOH value for the energy storage battery system can be obtained by looking up the preset SOH standard table.

[0053] It should be noted that the principle of SOH value correction during the discharge process of an energy storage battery system is basically similar to that during the charging process, and will not be repeated here.

[0054] The above operation involves looking up the preset SOH standard table by the charging capacity correction value to obtain the correction value of the SOH of the energy storage battery system. This allows it to be applied to various temperatures, thereby improving the accuracy of the SOH value estimation for the energy storage battery system.

[0055] In one embodiment, the method further includes, before correcting the SOH value of the energy storage battery system: The system acquires the historical SOH value of the energy storage battery system, as well as the current initial SOC value and current completed SOC value during the current charging process. Based on the rated capacity value, historical SOH value, current initial SOC value, and current completed SOC value, it obtains the estimated current cumulative charging capacity of the energy storage battery system. It then acquires the actual current cumulative charging capacity of the energy storage battery system. Based on the estimated and actual current cumulative charging capacity values, it obtains the current capacity estimation error value of the energy storage battery system. Finally, based on the current capacity estimation error value and a preset calibration difference, it triggers a correction operation on the SOH value of the energy storage battery system.

[0056] The historical SOH value refers to the value obtained when the energy storage battery system needed to be corrected for the current number of charges. The correction value can be used This means that, assuming this is the first time charging, then... h That is, 100%. Assuming this is the second time charging, then... h This is the value obtained when the first correction is needed.

[0057] Here, the BMS obtains the historical SOH value of the energy storage battery system, and the current initial SOC value of the energy storage battery system during the current charging process can be used. This indicates that the current SOC value after charging is complete can be used... This indicates that, under normal circumstances... It is a value that is less than 20%. It is a certain value of no less than 80%, which can ensure that the cumulative capacity of the energy storage battery system on a single charge can reach an effective value.

[0058] Specifically, based on the rated capacity value, historical SOH value, current initial SOC value, and current completed SOC value, the estimated current cumulative charging capacity of the energy storage battery system is obtained, which can be used as follows: The specific expression can be represented as follows: ; in, This indicates the rated capacity value.

[0059] To obtain the actual value of the current cumulative charging capacity of an energy storage battery system, you can use... This means that the BMS can collect data in real time from the current data, i.e., the data collected during this current data collection. Charged to The actual cumulative charging capacity during the process, combined with the current estimated cumulative charging capacity and the actual current cumulative charging capacity, yields the current capacity estimation error of the energy storage battery system. This error can be used... The specific expression can be represented as follows: =( - ) / ; Based on the current capacity estimation error and the preset calibration difference, a correction operation is triggered on the SOH value of the energy storage battery system.

[0060] In one feasible approach, the current capacity estimation error value is compared with a preset calibration difference value; when the current capacity estimation error value is greater than the preset calibration difference value, a full-charge calibration operation is performed on the energy storage battery system; the updated cumulative charging capacity estimation value and the updated cumulative charging capacity actual value of the energy storage battery system are obtained; based on the updated cumulative charging capacity actual value and the updated cumulative charging capacity estimation value, the updated capacity estimation error value of the energy storage battery system is obtained; based on the updated capacity estimation error value and the preset calibration difference value, a correction operation for the SOH value of the energy storage battery system is triggered.

[0061] Specifically, the preset calibration difference can be represented by K. The current capacitance estimation error value is compared with the preset calibration difference, that is... Compare with K. If the current capacity estimation error is less than or equal to the preset calibration difference, keep the current SOH value of the energy storage battery system unchanged; if the current capacity estimation error is greater than the preset calibration difference, i.e., when... When the value is greater than K, it can be considered that there is a deviation between the SOC value reported by the current energy storage battery system and the actual SOC value, or a deviation between the reported SOH value and the actual SOH value. In this case, a full-charge calibration operation can be performed on the energy storage battery system. After the full-charge calibration, a second charging process is performed, which involves discharging the energy storage battery system's SOC value to a value less than 20% and then charging it to a value greater than 80%. This yields the updated initial SOC value and the updated completed SOC value, which can be obtained respectively using... and This indicates that, based on the rated capacity, historical SOH value, initial SOC value for updated charging, and SOC value upon completion of updated charging, the estimated cumulative charging capacity of the energy storage battery system can be obtained. The specific expression can be represented as follows: ; At the same time, the BMS can also directly obtain data from the energy storage battery system. Charged to The updated cumulative charging capacity can be used to... express.

[0062] Based on the actual updated cumulative charging capacity and the estimated updated cumulative charging capacity, the error value of the updated capacity estimation for the energy storage battery system can be obtained. The specific expression can be represented as follows: =( - ) / ; Based on the updated capacity estimation error value and the preset calibration difference, a correction operation is triggered on the SOH value of the energy storage battery system.

[0063] In one feasible approach, the updated capacity estimation error value is compared with a preset calibration difference value; when the updated capacity estimation error value is less than or equal to the preset calibration difference value, the SOH value of the energy storage battery system remains unchanged; when the updated capacity estimation error value is greater than the preset calibration difference value, a correction operation for the SOH value of the energy storage battery system is triggered.

[0064] Specifically, the updated capacity estimation error value will be compared with the preset calibration difference value, that is... When compared with K, if the updated capacity estimation error value is less than or equal to the preset calibration difference, that is... When K is reached, the SOH value of the energy storage battery system remains unchanged, indicating that this deviation is caused by the cumulative error of the SOC value. Since the SOH value deviation factor is small, no SOH value calibration is performed. However, when the updated capacity estimation error value exceeds the preset calibration difference, i.e. When the value is greater than K, it indicates a deviation in the SOH value, requiring SOH calibration. This triggers a correction operation for the SOH value of the energy storage battery system. It should be noted that K here is not specifically limited and can be adjusted according to the BMS processing capabilities and accuracy requirements.

[0065] The above operation, by screening the SOH and SOC values ​​step by step, identifies the cause of the error and then determines whether to trigger the correction operation of the SOH value of the energy storage battery system, so as to further improve the accuracy and adaptability of the SOH value correction of the energy storage battery system.

[0066] Based on the implementation methods in the above embodiments, the following will be combined with... Figure 3 A preferred method flow provided in an embodiment of this application will be described by way of example. For instance... Figure 3 As shown, the method may include the following steps: Step S301: Obtain the historical SOH value of the energy storage battery system, as well as the current initial SOC value and the current completed SOC value of the energy storage battery system during the current charging process.

[0067] Step S302: Based on the rated capacity value, historical SOH value, current initial SOC value, and current completed SOC value, obtain the estimated current cumulative charging capacity of the energy storage battery system.

[0068] Step S303: Obtain the actual value of the current cumulative charging capacity of the energy storage battery system.

[0069] Step S304: Based on the current cumulative charging capacity estimate and the current cumulative charging capacity actual value, obtain the current capacity estimation error value of the energy storage battery system.

[0070] Step S305: Compare the current capacity estimation error value with the preset calibration difference value. If the current capacity estimation error value is less than or equal to the preset calibration difference value, proceed to step S306; if the current capacity estimation error value is greater than the preset calibration difference value, proceed to step S307.

[0071] Step S306: Keep the SOH value of the energy storage battery system unchanged.

[0072] Step S307: Perform a full charge calibration operation on the energy storage battery system.

[0073] Step S308: Obtain the updated cumulative charging capacity estimate and the updated cumulative charging capacity actual value of the energy storage battery system.

[0074] Step S309: Based on the actual value of the updated cumulative charging capacity and the estimated value of the updated cumulative charging capacity, obtain the updated capacity estimation error value of the energy storage battery system.

[0075] Step S310: Compare the updated capacity estimation error value with the preset calibration difference value. If the updated capacity estimation error value is less than or equal to the preset calibration difference value, proceed to step S311; if the updated capacity estimation error value is greater than the preset calibration difference value, proceed to step S312.

[0076] Step S311: Keep the SOH value of the energy storage battery system unchanged.

[0077] Step S312: Obtain the corrected starting SOC value and the actual value of the single cumulative charging capacity of the energy storage battery system.

[0078] Step S313: Obtain the rated capacity value of the energy storage battery system.

[0079] Step S314: Based on the corrected initial SOC value and the actual value of the single cumulative charging capacity, obtain the estimated full-charge capacity of the energy storage battery system.

[0080] Step S315: Based on the rated capacity value and the estimated full-charge capacity value, obtain the initial estimated SOH value of the energy storage battery system.

[0081] Step S316: Obtain the actual value of the total cumulative charging capacity and the average temperature value of the energy storage battery system throughout the entire cycle.

[0082] Step S317: Obtain the historical correction factor value of the SOH of the energy storage battery system.

[0083] Step S318: Based on the preset SOH standard table and the initial estimated SOH value, obtain the theoretical value of the total cumulative charging capacity of the energy storage battery system.

[0084] Step S319: Based on the theoretical value of the cumulative charging capacity, the average temperature value, and the actual value of the cumulative charging capacity, the initial correction factor value of the SOH of the energy storage battery system is obtained.

[0085] Step S320: Obtain the updated correction factor value based on the historical correction factor value and the initial correction factor value.

[0086] Step S321: Based on the summed cumulative actual charging capacity value, the updated correction factor value, and the average temperature value, the corrected charging capacity value of the energy storage battery system is obtained.

[0087] Step S322: Obtain the correction value of SOH for the energy storage battery system based on the preset SOH standard table and the charging capacity correction value.

[0088] It should be understood that, although Figure 1 , Figure 3 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated in this application, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Furthermore, Figure 1 , Figure 3 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0089] Figure 4 This is a schematic diagram of a device for correcting the SOH value of an energy storage battery system, provided in an embodiment of this application. This device can be installed in a BMS or a computer device to perform actions such as... Figure 1 , Figure 3 The method flow is shown below. Figure 4 As shown, the device may include: a first acquisition unit 401, a prediction unit 403, a second acquisition unit 405, an update unit 407, and a correction unit 409. The main functions of each component module are as follows: The first acquisition unit 401 is used to acquire the corrected charging start SOC value and the actual value of the single cumulative charging capacity of the energy storage battery system. The corrected charging start SOC value refers to the start SOC value before the full charging operation is performed after discharging the energy storage battery system before correcting it. The estimation unit 403 is used to obtain the rated capacity value of the energy storage battery system, and to obtain the initial estimated SOH value of the energy storage battery system based on the rated capacity value, the corrected initial SOC value and the actual value of the single cumulative charging capacity. The second acquisition unit 405 is used to acquire the actual value of the total cumulative charging capacity and the average temperature value of the energy storage battery system throughout the entire cycle. The update unit 407 is used to obtain the historical correction factor value of the SOH of the energy storage battery system, and to obtain the updated correction factor value of the SOH of the energy storage battery system based on the preset SOH standard table, the historical correction factor value, the initial estimated SOH value, and the actual value of the cumulative charging capacity. The correction unit 409 is used to obtain the correction value of the SOH of the energy storage battery system based on the preset SOH standard table, the actual value of the cumulative charging capacity, the updated correction factor value and the average temperature value.

[0090] In one embodiment, the estimation unit 403 is further configured to: Based on the corrected initial SOC value and the actual value of the single cumulative charging capacity, the estimated full charge capacity of the energy storage battery system is obtained. Based on the rated capacity and the estimated full-charge capacity, the initial estimated SOH value of the energy storage battery system is obtained.

[0091] In one embodiment, the update unit 407 is further configured to: Based on the preset SOH standard table and the initial estimated SOH value, the theoretical value of the total cumulative charging capacity of the energy storage battery system is obtained; Based on the sum of the theoretical value of cumulative charging capacity, the average temperature value, and the actual value of cumulative charging capacity, the initial correction factor value of SOH of the energy storage battery system is obtained. The updated correction factor value is obtained based on the historical correction factor value and the initial correction factor value.

[0092] In one embodiment, the correction unit 409 is further configured to: The corrected value of the charging capacity of the energy storage battery system is obtained by summarizing the actual value of the cumulative charging capacity, updating the correction factor value, and the average temperature value. Based on the preset SOH standard table and the charging capacity correction value, the correction value of SOH for the energy storage battery system is obtained.

[0093] In one embodiment, the device is further used for: Obtain the historical SOH value of the energy storage battery system, as well as the current initial SOC value and current completed SOC value of the energy storage battery system during the current charging process; Based on the rated capacity value, historical SOH value, current initial SOC value, and current completed SOC value, the current cumulative charging capacity of the energy storage battery system is estimated. Obtain the actual value of the current cumulative charging capacity of the energy storage battery system; Based on the current estimated cumulative charging capacity and the current actual cumulative charging capacity, the current capacity estimation error value of the energy storage battery system is obtained; Based on the current capacity estimation error and the preset calibration difference, a correction operation is triggered on the SOH value of the energy storage battery system.

[0094] In one embodiment, the device is further used for: Compare the current capacity estimation error value with the preset calibration difference value; When the current capacity estimation error value is greater than the preset calibration difference value, the energy storage battery system is fully charged for calibration. Obtain the updated cumulative charging capacity estimate and the updated cumulative charging capacity actual value of the energy storage battery system; Based on the actual value of the updated cumulative charging capacity and the estimated value of the updated cumulative charging capacity, the error value of the updated capacity estimation of the energy storage battery system is obtained. Based on the updated capacity estimation error value and the preset calibration difference, a correction operation is triggered on the SOH value of the energy storage battery system.

[0095] In one embodiment, the device is further used for: The updated capacity estimation error value will be compared with the preset calibration difference value; When the updated capacity estimation error value is less than or equal to the preset calibration difference, the SOH value of the energy storage battery system remains unchanged; When the updated capacity estimation error value is greater than the preset calibration difference, a correction operation on the SOH value of the energy storage battery system is triggered.

[0096] The same or similar parts among the above embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments.

[0097] It should be noted that the embodiments of this application may involve the use of user data. In practical applications, user-specific personal data may be used in the scheme described herein within the scope permitted by applicable laws and regulations, provided that it complies with the applicable laws and regulations of the country (e.g., explicit consent from the user, actual notification to the user, explicit authorization from the user, etc.).

[0098] According to embodiments of this application, this application also provides a computer device and a computer-readable storage medium.

[0099] like Figure 5 The diagram shown is a block diagram of a computer device according to an embodiment of this application. The term "computer device" is intended to represent various forms of digital computers or mobile devices. The digital computer may include a desktop computer, a portable computer, a workbench, a personal digital assistant, a server, a mainframe computer, and other suitable computers. The mobile device may include a tablet computer, a smartphone, a wearable device, etc.

[0100] like Figure 5 As shown, device 500 includes a computing unit 501, a ROM 502, a RAM 503, a bus 504, and an input / output (I / O) interface 505. The computing unit 501, ROM 502, and RAM 503 are interconnected via the bus 504. The input / output (I / O) interface 505 is also connected to the bus 504.

[0101] The computing unit 501 can execute various processes in the method embodiments of this application according to computer instructions stored in the read-only memory (ROM) 502 or computer instructions loaded from the storage unit 508 into the random access memory (RAM) 503. The computing unit 501 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. The computing unit 501 can include, but is not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. In some embodiments, the methods provided in the embodiments of this application can be implemented as computer software programs, which are tangibly contained in a computer-readable storage medium, such as the storage unit 508.

[0102] RAM 503 can also store various programs and data required for the operation of device 500. Part or all of the computer program can be loaded and / or installed on device 500 via ROM 502 and / or communication unit 509.

[0103] The input unit 506, output unit 507, storage unit 508, and communication unit 509 in device 500 can be connected to I / O interface 505. The input unit 506 can be, for example, a keyboard, mouse, touchscreen, or microphone; the output unit 507 can be, for example, a display, speaker, or indicator light. Device 500 can exchange information and data with other devices through the communication unit 509.

[0104] It should be noted that the device may also include other components necessary for normal operation. It may also include only the components necessary for implementing the solution of this application, without necessarily including all the components shown in the figures.

[0105] Various implementations of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SOCs), payload programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof.

[0106] The computer instructions used to implement the methods of this application may be written in any combination of one or more programming languages. These computer instructions may be provided to the computing unit 501 such that when executed by the computing unit 501, such as a processor, the computer instructions cause the execution of the steps involved in the embodiments of the methods of this application.

[0107] The computer-readable storage medium provided in this application can be a tangible medium that can contain or store computer instructions for performing the steps involved in the method embodiments of this application. The computer-readable storage medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, and other forms of storage media.

[0108] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for correcting the SOH value of an energy storage battery system, characterized in that, The method comprises: obtaining a corrected charging starting SOC value and a single cumulative charging capacity actual value of the energy storage battery system, wherein the corrected charging starting SOC value refers to a starting SOC value before full charging after discharging the energy storage battery system before correction; obtaining a rated capacity value of the energy storage battery system, and obtaining an initial estimated SOH value of the energy storage battery system according to the rated capacity value, the corrected charging starting SOC value and the single cumulative charging capacity actual value; obtaining an average temperature value and a summarized cumulative charging capacity actual value of the energy storage battery system in a whole cycle; obtaining a historical correction factor value of the SOH of the energy storage battery system, and obtaining an updated correction factor value of the SOH of the energy storage battery system according to a preset SOH standard table, the historical correction factor value, the initial estimated SOH value and the summarized cumulative charging capacity actual value; obtaining a correction value of the SOH of the energy storage battery system according to the preset SOH standard table, the summarized cumulative charging capacity actual value, the updated correction factor value and the average temperature value.

2. The method of claim 1, wherein, The method comprises: obtaining a corrected charging starting SOC value and a single cumulative charging capacity actual value of the energy storage battery system, wherein the corrected charging starting SOC value refers to a starting SOC value before full charging after discharging the energy storage battery system before correction; obtaining a rated capacity value of the energy storage battery system, and obtaining an initial estimated SOH value of the energy storage battery system according to the rated capacity value, the corrected charging starting SOC value and the single cumulative charging capacity actual value; 3. The method of claim 2, wherein, obtaining an average temperature value and a summarized cumulative charging capacity actual value of the energy storage battery system in a whole cycle; obtaining a historical correction factor value of the SOH of the energy storage battery system, and obtaining an updated correction factor value of the SOH of the energy storage battery system according to a preset SOH standard table, the historical correction factor value, the initial estimated SOH value and the summarized cumulative charging capacity actual value; obtaining a correction value of the SOH of the energy storage battery system according to the preset SOH standard table, the summarized cumulative charging capacity actual value, the updated correction factor value and the average temperature value. The method comprises:

4. The method of claim 3, wherein, obtaining a corrected charging starting SOC value and a single cumulative charging capacity actual value of the energy storage battery system, wherein the corrected charging starting SOC value refers to a starting SOC value before full charging after discharging the energy storage battery system before correction; obtaining a rated capacity value of the energy storage battery system, and obtaining an initial estimated SOH value of the energy storage battery system according to the rated capacity value, the corrected charging starting SOC value and the single cumulative charging capacity actual value; obtaining an average temperature value and a summarized cumulative charging capacity actual value of the energy storage battery system in a whole cycle; 5. The method of claim 1, wherein, obtaining a historical correction factor value of the SOH of the energy storage battery system, and obtaining an updated correction factor value of the SOH of the energy storage battery system according to a preset SOH standard table, the historical correction factor value, the initial estimated SOH value and the summarized cumulative charging capacity actual value; obtaining a correction value of the SOH of the energy storage battery system according to the preset SOH standard table, the summarized cumulative charging capacity actual value, the updated correction factor value and the average temperature value. The method comprises: obtaining a corrected charging starting SOC value and a single cumulative charging capacity actual value of the energy storage battery system, wherein the corrected charging starting SOC value refers to a starting SOC value before full charging after discharging the energy storage battery system before correction; obtaining a rated capacity value of the energy storage battery system, and obtaining an initial estimated SOH value of the energy storage battery system according to the rated capacity value, the corrected charging starting SOC value and the single cumulative charging capacity actual value; obtaining an average temperature value and a summarized cumulative charging capacity actual value of the energy storage battery system in a whole cycle; obtaining a historical correction factor value of the SOH of the energy storage battery system, and obtaining an updated correction factor value of the SOH of the energy storage battery system according to a preset SOH standard table, the historical correction factor value, the initial estimated SOH value and the summarized cumulative charging capacity actual value; obtaining a correction value of the SOH of the energy storage battery system according to the preset SOH standard table, the summarized cumulative charging capacity actual value, the updated correction factor value and the average temperature value. The method comprises: obtaining a corrected charging starting SOC value and a single cumulative charging capacity actual value of the energy storage battery system, wherein the corrected charging starting SOC value refers to a starting SOC value before full charging after discharging the energy storage battery system before correction; obtaining a rated capacity value of the energy storage battery system, and obtaining an initial estimated SOH value of the energy storage battery system according to the rated capacity value, the corrected charging starting SOC value and the single cumulative charging capacity actual value; obtaining an average temperature value and a summarized cumulative charging capacity actual value of the energy storage battery system in a whole cycle; obtaining a historical correction factor value of the SOH of the energy storage battery system, and obtaining an updated correction factor value of the SOH of the energy storage battery system according to a preset SOH standard table, the historical correction factor value, the initial estimated SOH value and the summarized cumulative charging capacity actual value; obtaining a correction value of the SOH of the energy storage battery system according to the preset SOH standard table, the summarized cumulative charging capacity actual value, the updated correction factor value and the average temperature value. According to the rated capacity value, the historical SOH value, the current charging initial SOC value and the current charging completed SOC value, a current cumulative charging capacity estimation value of the energy storage battery system is obtained; An actual value of the current cumulative charging capacity of the energy storage battery system is obtained; According to the current cumulative charging capacity estimation value and the actual value of the current cumulative charging capacity, a current capacity estimation error value of the energy storage battery system is obtained; According to the current capacity estimation error value and a preset calibration difference value, a correction operation on the SOH value of the energy storage battery system is triggered.

6. The method of claim 5, wherein, The correction operation on the SOH value of the energy storage battery system according to the current capacity estimation error and the preset estimation calibration difference includes: The current capacity estimation error value and the preset calibration difference value are compared; When the current capacity estimation error value is greater than the preset calibration difference value, a full charging calibration operation is performed on the energy storage battery system; An updated cumulative charging capacity estimation value and an updated cumulative charging capacity actual value of the energy storage battery system are obtained; According to the updated cumulative charging capacity actual value and the updated cumulative charging capacity estimation value, an updated capacity estimation error value of the energy storage battery system is obtained; According to the updated capacity estimation error value and the preset calibration difference value, a correction operation on the SOH value of the energy storage battery system is triggered.

7. The method of claim 6, wherein, The correction operation on the SOH value of the energy storage battery system according to the updated capacity estimation error value and the preset calibration difference value includes: The updated capacity estimation error value and the preset calibration difference value are compared; When the updated capacity estimation error value is less than or equal to the preset calibration difference value, the SOH value of the energy storage battery system is kept unchanged; When the updated capacity estimation error value is greater than the preset calibration difference value, a correction operation on the SOH value of the energy storage battery system is triggered.

8. An energy storage battery system SOH value correction device characterized by comprising: The device includes: A first obtaining unit is configured to obtain a corrected charging initial SOC value and a single cumulative charging capacity actual value of an energy storage battery system, wherein the corrected charging initial SOC value refers to an initial SOC value before a full charging operation after discharging the energy storage battery system before the correction of the energy storage battery system; A pre-estimating unit is configured to obtain a rated capacity value of the energy storage battery system, and obtain an initial estimated SOH value of the energy storage battery system according to the rated capacity value, the corrected charging initial SOC value and the single cumulative charging capacity actual value; A second obtaining unit is configured to obtain a summary cumulative charging capacity actual value and an average temperature value of the energy storage battery system in a whole cycle; An updating unit is configured to obtain a historical correction factor value of the SOH of the energy storage battery system, and obtain an updated correction factor value of the SOH of the energy storage battery system according to a preset SOH standard table, the historical correction factor value, the initial estimated SOH value and the summary cumulative charging capacity actual value; A correction unit is configured to obtain a correction value of the SOH of the energy storage battery system according to the preset SOH standard table, the summary cumulative charging capacity actual value, the updated correction factor value and the average temperature value.

9. A computer device, comprising: at least one processor; and a memory in communication with the at least one processor; wherein the memory stores computer instructions executable by the at least one processor, the computer instructions being executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.

10. A computer readable storage medium having stored thereon computer instructions, wherein, the computer instructions are for causing a computer to perform the method of any one of claims 1 to 7.

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