A method and device for determining the health status of an energy storage system, and a storage medium

Abstract

The present invention relates to the technical field of energy storage batteries, and discloses a method and device for determining the health status of an energy storage system, as well as a storage medium. The method comprises: obtaining a temperature data set and a SOC data set of the energy storage battery of the energy storage system during cyclic charge and discharge; determining the cycle capacity SOH of the energy storage system based on the temperature data set; and determining the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set; and fusing the cycle capacity SOH and the calendar life SOH based on a preset fusion algorithm to obtain a target SOH of the energy storage system. It can be seen that the implementation of the present invention can improve the accuracy of determining the target SOH of the energy storage system, thereby facilitating the accurate prediction of the remaining life of the energy storage system battery based on the accurately determined target SOH, and further facilitating the accuracy of formulating subsequent maintenance plans for the energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage batteries, and in particular to a method and device for determining the health status of an energy storage system, and a storage medium. Background Art

[0002] The battery application conditions of the energy storage system are close to the standard operating conditions. Specifically, the battery is charged and discharged at a fixed power / rate, and is left idle for a long time after being fully charged or discharged. Therefore, it is common to calculate the SOH (State of Health) of the energy storage system based on the cycle life and calendar life of the energy storage system.

[0003] However, in practice, it has been found that conventional SOH calculation methods typically only take the smaller value of the cycle life information and calendar life information, failing to consider the simultaneous and intertwined existence of capacity decay and calendar time decay in actual application scenarios. This can easily lead to low accuracy in the determined SOH of the energy storage system, hindering the prediction of the remaining life of the energy storage system battery. Therefore, it is particularly important to propose a technical solution to improve the accuracy of determining the target SOH of the energy storage system. Summary of the Invention

[0004] The present invention provides a method and device for determining the health status of an energy storage system, and a storage medium, which can improve the accuracy of determining the target SOH of the energy storage system, and is conducive to accurately predicting the remaining life of the energy storage system battery based on the accurately determined target SOH.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a method for determining the health status of an energy storage system, the method comprising:

[0006] Acquire a temperature data set of an energy storage battery of an energy storage system and a SOC data set of the energy storage battery during a cyclic charge and discharge process;

[0007] Determining a cycle capacity (SOH) of the energy storage system based on the temperature data set; and determining a calendar life (SOH) of the energy storage system based on the temperature data set and the SOC data set;

[0008] Based on a preset fusion algorithm, the cycle capacity SOH and the calendar life SOH are fused to obtain the current health status of the energy storage system.

[0009] As an optional implementation manner, in the first aspect of the present invention, the temperature data set includes a plurality of temperature data;

[0010] And, determining the cycle capacity SOH of the energy storage system according to the temperature data set includes:

[0011] Obtaining the current of the energy storage battery and the rated capacity of the energy storage battery;

[0012] Determining a cycle capacity impact factor of the energy storage system according to a preset first mapping relationship between temperature and cycle impact factor and the temperature data set;

[0013] Based on the cycle capacity influencing factor, integrating the current of the energy storage battery to obtain the battery cycle capacity of the energy storage battery;

[0014] Calculating the current cycle number of the energy storage battery according to the battery cycle capacity and the rated capacity of the energy storage battery;

[0015] The cycle capacity SOH of the energy storage system is determined according to a second mapping relationship between a preset number of times and a cycle capacity and the current number of cycles.

[0016] As an optional embodiment, in the first aspect of the present invention, determining the cycle capacity SOH of the energy storage system based on a second mapping relationship between a preset number of times and cycle capacity and the current number of cycles includes:

[0017] According to a preset second mapping relationship between the number of cycles and the cycle capacity, searching among all initial cycle numbers corresponding to the second mapping relationship whether there is a target cycle number that is the same as the current cycle number;

[0018] When it is found that there is a target cycle number that is the same as the current cycle number among all the initial cycle numbers, based on the second mapping relationship, the first cycle capacity SOH mapped to the target cycle number is determined as the cycle capacity SOH of the energy storage system;

[0019] When it is found that there is no target cycle number that is the same as the current cycle number among all the initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number is generated based on the current cycle number, all the initial cycle numbers and the initial cycle capacity SOH mapped to all the initial cycle numbers, and the second cycle capacity SOH is determined as the cycle capacity SOH of the energy storage system.

[0020] As an optional embodiment, in the first aspect of the present invention, generating a second cycle capacity SOH mapped to the current cycle number based on the current cycle number, all the initial cycle numbers, and the initial cycle capacity SOH mapped to all the initial cycle numbers includes:

[0021] Calculating the difference between the current cycle number and each of the initial cycle numbers;

[0022] According to the number difference between the current cycle number and all the initial cycle numbers, determining a first cycle number from all the initial cycle numbers, the first cycle number having the smallest absolute value of the number difference with the current cycle number;

[0023] According to the number difference between the current cycle number and all the initial cycle numbers, determining a second cycle number from all the initial cycle numbers, the second cycle number having the second smallest absolute value of the number difference between the current cycle number and the initial cycle number;

[0024] The first cycle number and the initial cycle capacity SOH mapped to the first cycle number are used as the first value, the second cycle number and the initial cycle capacity SOH mapped to the second cycle number are used as the second value, and the current cycle number is used as the target value for linear interpolation calculation to obtain the second cycle capacity SOH mapped to the current cycle number.

[0025] As an optional embodiment, in the first aspect of the present invention, determining the cycle capacity impact factor of the energy storage system based on a preset first mapping relationship between temperature and cycle impact factor and the temperature data set includes:

[0026] Determining maximum temperature data and minimum temperature data from the temperature data set;

[0027] According to a preset first mapping relationship between temperature and cycle impact factor, screening out a first cycle impact factor corresponding to the maximum temperature data from all cycle impact factors corresponding to the first mapping relationship;

[0028] According to the first mapping relationship, a second circulation influence factor corresponding to the minimum temperature data is filtered out from all the circulation influence factors corresponding to the first mapping relationship;

[0029] The one with the largest value is selected from the first cycle impact factor and the second cycle impact factor as the cycle capacity impact factor of the energy storage system.

[0030] As an optional embodiment, in the first aspect of the present invention, determining the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set includes:

[0031] Obtaining the power-off time and the power-on time of each cycle of the energy storage system, calculating the difference between each power-off time and the current time, and calculating the sum of all the differences between the power-off time and the current time, to obtain the historical calendar duration of the energy storage system, where the cycle corresponds to the process of the energy storage battery of the energy storage system from being fully charged to being discharged;

[0032] Calculating the difference between each power-off time and the next power-on time corresponding to the power-off time, and calculating the sum of the differences between all power-off times and the corresponding next power-on times to obtain the sleep duration of the energy storage system;

[0033] Calculating a historical cumulative static time of the energy storage system based on the temperature data set and the SOC data set;

[0034] Calculating the sum of the historical calendar duration, the dormancy duration, and the historical accumulated static duration of the energy storage system to obtain the total calendar duration of the energy storage system;

[0035] The calendar life SOH of the energy storage system is determined according to a third mapping relationship between a preset duration and a calendar life, and the total calendar duration of the energy storage system.

[0036] As an optional embodiment, in the first aspect of the present invention, calculating the historical cumulative idle time of the energy storage system based on the temperature data set and the SOC data set includes:

[0037] Obtaining a charge and discharge current set of the energy storage system during each cycle, wherein the charge and discharge current set includes one or more charge and discharge currents;

[0038] For each of the cycles, detecting whether there is a target charge / discharge current less than or equal to a preset current in the set of charge / discharge currents of the energy storage system within the cycle; and when detecting that there is a target charge / discharge current less than or equal to the preset current in the set of charge / discharge currents of the energy storage system within the cycle, detecting whether a duration of charge / discharge during which the target charge / discharge current is less than or equal to the preset current is greater than or equal to a preset duration of detection;

[0039] If it is detected that the target charge / discharge current is less than or equal to the preset current and the charge / discharge duration is greater than or equal to the continuous detection duration, then the static duration of the energy storage system in the cycle is calculated based on the charge / discharge duration of the cycle, the temperature data set, and the SOC data set, and the charge / discharge current corresponding to the moment after the end of the static duration is greater than the preset current;

[0040] The static time of the energy storage system in all cycles is accumulated to obtain a historical cumulative static time of the energy storage system.

[0041] As an optional embodiment, in the first aspect of the present invention, each SOC data in the SOC data set and each temperature data in the temperature data set has a corresponding charge and discharge time;

[0042] And, for each of the cycles, calculating the static time of the energy storage system in the cycle based on the charge and discharge duration, the temperature data set, and the SOC data set of the cycle, including:

[0043] Determining, based on a preset fourth mapping relationship between temperature / SOC and calendar impact factor, a calendar life impact factor for each of all target charge and discharge moments included in the charge and discharge duration of the cycle;

[0044] The target charge and discharge currents corresponding to all the target charge and discharge times and the calendar life impact factors of all the target charge and discharge times are matched according to all the target charge and discharge times to obtain all target matching groups of the cycle, wherein the target charge and discharge time corresponding to the target charge and discharge current in each target matching group is the same as the target charge and discharge time of the calendar life impact factor in the target matching group;

[0045] An integral calculation is performed on all the target matching groups in the cycle to obtain the static time of the energy storage system in the cycle.

[0046] A second aspect of the present invention discloses a device for determining the health status of an energy storage system, the device comprising:

[0047] An acquisition module is used to acquire a temperature data set of an energy storage battery of an energy storage system and a SOC data set of the energy storage battery during a cyclic charge and discharge process;

[0048] a determination module, configured to determine a cycle capacity SOH of the energy storage system based on the temperature data set;

[0049] The determining module is further configured to determine a calendar life SOH of the energy storage system based on the temperature data set and the SOC data set;

[0050] A fusion module is used to fuse the cycle capacity SOH and the calendar life SOH based on a preset fusion algorithm to obtain the current health status of the energy storage system.

[0051] As an optional implementation, in the second aspect of the present invention, the temperature data set includes a plurality of temperature data;

[0052] Furthermore, the determination module determines the cycle capacity SOH of the energy storage system according to the temperature data set in a manner that specifically includes:

[0053] Obtaining the current of the energy storage battery and the rated capacity of the energy storage battery;

[0054] Determining a cycle capacity impact factor of the energy storage system according to a preset first mapping relationship between temperature and cycle impact factor and the temperature data set;

[0055] Based on the cycle capacity influencing factor, integrating the current of the energy storage battery to obtain the battery cycle capacity of the energy storage battery;

[0056] Calculating the current cycle number of the energy storage battery according to the battery cycle capacity and the rated capacity of the energy storage battery;

[0057] The cycle capacity SOH of the energy storage system is determined according to a second mapping relationship between a preset number of times and a cycle capacity and the current number of cycles.

[0058] As an optional embodiment, in the second aspect of the present invention, the determination module determines the cycle capacity SOH of the energy storage system according to a second mapping relationship between a preset number of times and cycle capacity and the current cycle number, specifically including:

[0059] According to a preset second mapping relationship between the number of cycles and the cycle capacity, searching among all initial cycle numbers corresponding to the second mapping relationship whether there is a target cycle number that is the same as the current cycle number;

[0060] When it is found that there is a target cycle number that is the same as the current cycle number among all the initial cycle numbers, based on the second mapping relationship, the first cycle capacity SOH mapped to the target cycle number is determined as the cycle capacity SOH of the energy storage system;

[0061] When it is found that there is no target cycle number that is the same as the current cycle number among all the initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number is generated based on the current cycle number, all the initial cycle numbers and the initial cycle capacity SOH mapped to all the initial cycle numbers, and the second cycle capacity SOH is determined as the cycle capacity SOH of the energy storage system.

[0062] As an optional implementation manner, in the second aspect of the present invention, the determination module generates a second cycle capacity SOH mapped to the current cycle number based on the current cycle number, all the initial cycle numbers, and the initial cycle capacity SOH mapped to all the initial cycle numbers, specifically including:

[0063] Calculating the difference between the current cycle number and each of the initial cycle numbers;

[0064] According to the number difference between the current cycle number and all the initial cycle numbers, determining a first cycle number from all the initial cycle numbers, the first cycle number having the smallest absolute value of the number difference with the current cycle number;

[0065] According to the number difference between the current cycle number and all the initial cycle numbers, determining a second cycle number from all the initial cycle numbers, the second cycle number having the second smallest absolute value of the number difference between the current cycle number and the initial cycle number;

[0066] The first cycle number and the initial cycle capacity SOH mapped to the first cycle number are used as the first value, the second cycle number and the initial cycle capacity SOH mapped to the second cycle number are used as the second value, and the current cycle number is used as the target value for linear interpolation calculation to obtain the second cycle capacity SOH mapped to the current cycle number.

[0067] As an optional embodiment, in the second aspect of the present invention, the determination module determines the cycle capacity impact factor of the energy storage system according to a preset first mapping relationship between temperature and cycle impact factor and the temperature data set, specifically including:

[0068] Determining maximum temperature data and minimum temperature data from the temperature data set;

[0069] According to a preset first mapping relationship between temperature and cycle impact factor, screening out a first cycle impact factor corresponding to the maximum temperature data from all cycle impact factors corresponding to the first mapping relationship;

[0070] According to the first mapping relationship, a second circulation influence factor corresponding to the minimum temperature data is filtered out from all the circulation influence factors corresponding to the first mapping relationship;

[0071] The one with the largest value is selected from the first cycle impact factor and the second cycle impact factor as the cycle capacity impact factor of the energy storage system.

[0072] As an optional implementation, in the second aspect of the present invention, the determination module determines the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set, specifically including:

[0073] Obtaining the power-off time and the power-on time of each cycle of the energy storage system, calculating the difference between each power-off time and the current time, and calculating the sum of all the differences between the power-off time and the current time, to obtain the historical calendar duration of the energy storage system, where the cycle corresponds to the process of the energy storage battery of the energy storage system from being fully charged to being discharged;

[0074] Calculating the difference between each power-off time and the next power-on time corresponding to the power-off time, and calculating the sum of the differences between all power-off times and the corresponding next power-on times to obtain the sleep duration of the energy storage system;

[0075] Calculating a historical cumulative static time of the energy storage system based on the temperature data set and the SOC data set;

[0076] Calculating the sum of the historical calendar duration, the dormancy duration, and the historical accumulated static duration of the energy storage system to obtain the total calendar duration of the energy storage system;

[0077] The calendar life SOH of the energy storage system is determined according to a third mapping relationship between a preset duration and a calendar life, and the total calendar duration of the energy storage system.

[0078] As an optional implementation, in the second aspect of the present invention, the determination module calculates the historical cumulative idle time of the energy storage system based on the temperature data set and the SOC data set, specifically including:

[0079] Obtaining a charge and discharge current set of the energy storage system during each cycle, wherein the charge and discharge current set includes one or more charge and discharge currents;

[0080] For each of the cycles, detecting whether there is a target charge / discharge current less than or equal to a preset current in the set of charge / discharge currents of the energy storage system within the cycle; and when detecting that there is a target charge / discharge current less than or equal to the preset current in the set of charge / discharge currents of the energy storage system within the cycle, detecting whether a duration of charge / discharge during which the target charge / discharge current is less than or equal to the preset current is greater than or equal to a preset duration of detection;

[0081] If it is detected that the target charge / discharge current is less than or equal to the preset current and the charge / discharge duration is greater than or equal to the continuous detection duration, then the static duration of the energy storage system in the cycle is calculated based on the charge / discharge duration of the cycle, the temperature data set, and the SOC data set, and the charge / discharge current corresponding to the moment after the end of the static duration is greater than the preset current;

[0082] The static time of the energy storage system in all cycles is accumulated to obtain a historical cumulative static time of the energy storage system.

[0083] As an optional embodiment, in the second aspect of the present invention, each SOC data in the SOC data set and each temperature data in the temperature data set has a corresponding charge and discharge time;

[0084] Furthermore, for each cycle, the determination module calculates the static time of the energy storage system in the cycle based on the charge and discharge duration, the temperature data set, and the SOC data set of the cycle, specifically including:

[0085] Determining, based on a preset fourth mapping relationship between temperature / SOC and calendar impact factor, a calendar life impact factor for each of all target charge and discharge moments included in the charge and discharge duration of the cycle;

[0086] The target charge and discharge currents corresponding to all the target charge and discharge times and the calendar life impact factors of all the target charge and discharge times are matched according to all the target charge and discharge times to obtain all target matching groups of the cycle, wherein the target charge and discharge time corresponding to the target charge and discharge current in each target matching group is the same as the target charge and discharge time of the calendar life impact factor in the target matching group;

[0087] An integral calculation is performed on all the target matching groups in the cycle to obtain the static time of the energy storage system in the cycle.

[0088] A third aspect of the present invention discloses another device for determining the health status of an energy storage system, the device comprising:

[0089] a memory storing executable program code;

[0090] a processor coupled to the memory;

[0091] The processor calls the executable program code stored in the memory to execute the method for determining the health status of the energy storage system disclosed in the first aspect of the present invention.

[0092] A fourth aspect of the present invention discloses a computer storage medium storing computer instructions. When the computer instructions are called, they are used to execute the method for determining the health status of an energy storage system disclosed in the first aspect of the present invention.

[0093] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0094] In an embodiment of the present invention, a temperature data set and an SOC data set of an energy storage battery of an energy storage system during a cyclic charge and discharge process are obtained; a cycle capacity SOH of the energy storage system is determined based on the temperature data set; and a calendar life SOH of the energy storage system is determined based on the temperature data set and the SOC data set; and based on a preset fusion algorithm, the cycle capacity SOH and the calendar life SOH are fused to obtain a target SOH of the energy storage system. It can be seen that the implementation of the present invention can obtain the temperature data set of the energy storage battery and the SOC data set of the energy storage battery of the energy storage system during the cyclic charge and discharge process, and determine the cycle capacity SOH of the energy storage system based on the temperature data set, which can improve the accuracy of determining the cycle capacity SOH of the energy storage system, and determine the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set, which can improve the accuracy of determining the calendar life SOH of the energy storage system, and can flexibly realize the calculation of different types of life data of the energy storage system through multiple data, and then based on the preset fusion algorithm, the accurately determined cycle capacity SOH and calendar life SOH are fused to obtain the target SOH of the energy storage system, which can improve the accuracy of determining the target SOH of the energy storage system, thereby facilitating the accurate prediction of the remaining life of the battery of the energy storage system based on the accurately determined target SOH, and further facilitating the improvement of the accuracy of formulating the subsequent maintenance plan of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0096] Figure 1 This is a flow chart of a method for determining the health status of an energy storage system disclosed in an embodiment of the present invention;

[0097] Figure 2 is a flow chart of another method for determining the health status of an energy storage system disclosed in an embodiment of the present invention;

[0098] Figure 3This is a flow chart of another method for determining the health status of an energy storage system disclosed in an embodiment of the present invention;

[0099] Figure 4 This is a flow chart of a method for calculating cycle life SOH disclosed in an embodiment of the present invention;

[0100] Figure 5 This is a flow chart of a calendar life SOH calculation method disclosed in an embodiment of the present invention;

[0101] Figure 6 This is a schematic structural diagram of a device for determining the health status of an energy storage system disclosed in an embodiment of the present invention;

[0102] Figure 7 It is a structural diagram of another device for determining the health status of an energy storage system disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0103] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0104] The terms "first," "second," and so on, in the description and claims of the present invention and the accompanying drawings are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or end comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed therein, or may optionally include other steps or elements inherent to such process, method, product, or end.

[0105] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0106] The present invention discloses a method and device for determining the health status of an energy storage system, and a storage medium. The method can obtain a temperature data set and a SOC data set of an energy storage battery of the energy storage system during cyclic charge and discharge, and determine the cycle capacity SOH of the energy storage system based on the temperature data set, thereby improving the accuracy of determining the cycle capacity SOH of the energy storage system. The method can also determine the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set, thereby improving the accuracy of determining the calendar life SOH of the energy storage system. The method can also flexibly calculate different types of life data of the energy storage system through multiple data, and then, based on a preset fusion algorithm, fuse the accurately determined cycle capacity SOH and calendar life SOH to obtain the target SOH of the energy storage system, thereby improving the accuracy of determining the target SOH of the energy storage system. This is conducive to accurately predicting the remaining life of the energy storage system battery based on the accurately determined target SOH, thereby improving the accuracy of formulating subsequent maintenance plans for the energy storage system. Detailed descriptions are given below.

[0107] Example 1

[0108] See also Figure 1 , Figure 1 This is a flow chart of a method for determining the health status of an energy storage system disclosed in an embodiment of the present invention. Figure 1 The described method for determining the health status of an energy storage system can be applied to a device for determining the health status of an energy storage system, wherein the device may include a determination device or a determination server, wherein the determination server may include a cloud server or a local server, which is not limited in the embodiment of the present invention. Figure 1 As shown, the method for determining the health status of the energy storage system may include the following operations:

[0109] 101. Obtain a temperature data set and an SOC data set of an energy storage battery of an energy storage system during a cyclic charge and discharge process.

[0110] In an embodiment of the present invention, the temperature data set of the energy storage battery may include multiple temperature data of the energy storage battery. The SOC data set of the energy storage battery may include multiple SOC data of the energy storage battery. The aforementioned cyclic charge and discharge process may include all historical cyclic charge and discharge processes that the energy storage system has experienced.

[0111] 102. Determine the cycle capacity SOH of the energy storage system based on the temperature data set.

[0112] In an embodiment of the present invention, the cycle capacity SOH can be used to indicate the health status / healthiness of the cycle capacity of the energy storage system. The cycle capacity SOH can be expressed in the form of a percentage. For example, when the energy storage system is just shipped (i.e., the number of battery cycles is zero), its cycle capacity SOH is 100%; when the number of battery cycles of the energy storage system is high (e.g., 8,000 times), its cycle capacity SOH is 60%.

[0113] 103. Determine the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set.

[0114] In the embodiment of the present invention, the calendar life SOH may be used to indicate the state of health / healthiness of the calendar life of the energy storage system.

[0115] In the embodiment of the present invention, there is no particular order between step 102 and step 103, that is, step 103 may occur before step 102, after step 102, or simultaneously with step 102, which is not limited in the embodiment of the present invention.

[0116] 104. Based on the preset fusion algorithm, the cycle capacity SOH and the calendar life SOH are fused to obtain the current health status of the energy storage system.

[0117] It can be seen that implementation Figure 1 The described method for determining the health status of the energy storage system can obtain the temperature data set of the energy storage battery of the energy storage system and the SOC data set of the energy storage battery during the cyclic charge and discharge process, and determine the cycle capacity SOH of the energy storage system based on the temperature data set, which can improve the accuracy of determining the cycle capacity SOH of the energy storage system, and determine the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set, which can improve the accuracy of determining the calendar life SOH of the energy storage system, and can flexibly realize the calculation of different types of life data of the energy storage system through multiple data, and then based on the preset fusion algorithm, the accurately determined cycle capacity SOH and calendar life SOH are fused to obtain the target SOH of the energy storage system, which can improve the accuracy of determining the target SOH of the energy storage system, thereby facilitating the accurate prediction of the remaining life of the energy storage system battery based on the accurately determined target SOH, and further facilitating the improvement of the accuracy of the formulation of subsequent maintenance plans for the energy storage system.

[0118] In another optional embodiment, determining the cycle capacity SOH of the energy storage system based on the temperature data set in step 102 may include:

[0119] Obtain the current and rated capacity of the energy storage battery;

[0120] Determining a cycle capacity impact factor of the energy storage system based on a pre-set first mapping relationship between temperature and cycle impact factor and a temperature data set;

[0121] Based on the cycle capacity influencing factor, the current of the energy storage battery is integrated and calculated to obtain the battery cycle capacity of the energy storage battery;

[0122] Calculate the current cycle number of the energy storage battery based on the battery cycle capacity and the rated capacity of the energy storage battery;

[0123] The cycle capacity SOH of the energy storage system is determined according to a second mapping relationship between the preset number of times and the cycle capacity and the current number of cycles.

[0124] In the embodiment of the present invention, specifically, the calculation formula for the battery cycle capacity of the energy storage battery is as follows:

[0125] q=∫i*n;

[0126] Among them, q is the battery cycle capacity of the energy storage battery, n is the cycle capacity influencing factor of the energy storage system, and i is the current of the energy storage battery.

[0127] Specifically, the calculation formula for the current cycle number of the energy storage battery is as follows:

[0128] m=q / q 额定 ;

[0129] Among them, m is the current cycle number of the energy storage battery, q is the battery cycle capacity of the energy storage battery, and q 额定 is the rated capacity of the energy storage battery.

[0130] It can be seen that this optional embodiment can determine the cycle capacity influence factor of the energy storage system based on the first mapping relationship between the preset temperature and the cycle influence factor, and the temperature data set, and can improve the accuracy of determining the cycle capacity influence factor of the energy storage battery based on the temperature data set of the energy storage battery. Subsequently, based on the accurately determined cycle capacity influence factor, the acquired current of the energy storage battery is integrated and calculated to obtain the battery cycle capacity of the energy storage battery, which can improve the accuracy and reliability of the calculated battery cycle capacity. Then, based on the accurately calculated battery cycle capacity and the acquired rated capacity of the energy storage battery, the current cycle number of the energy storage battery is accurately calculated, and the cycle capacity SOH of the energy storage system is determined based on the preset second mapping relationship between the number and the cycle capacity, and the accurately calculated current cycle number. The accuracy of determining the cycle capacity SOH can be improved by using the cycle capacity influence factor based on the temperature data set.

[0131] In this optional embodiment, as an optional implementation manner, determining the cycle capacity SOH of the energy storage system based on the second mapping relationship between the preset number of times and the cycle capacity and the current cycle number may include:

[0132] According to a preset second mapping relationship between the number of cycles and the cycle capacity, searching for a target cycle number that is the same as the current cycle number among all initial cycle numbers corresponding to the second mapping relationship;

[0133] When a target cycle number that is the same as the current cycle number is found among all the initial cycle numbers, the first cycle capacity SOH mapped to the target cycle number is determined as the cycle capacity SOH of the energy storage system based on the second mapping relationship;

[0134] When it is found that there is no target cycle number that is the same as the current cycle number among all the initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number is generated based on the current cycle number, all the initial cycle numbers and the initial cycle capacity SOH mapped to all the initial cycle numbers, and the second cycle capacity SOH is determined as the cycle capacity SOH of the energy storage system.

[0135] In an embodiment of the present invention, the second mapping relationship is used to represent a mapping relationship between a plurality of preset initial cycle counts and a plurality of preset initial cycle capacities SOH. For example, Table 1 is a mapping relationship table between counts and cycle life disclosed in an embodiment of the present invention. Referring to Table 1, the mapping relationship table between counts and cycle capacity includes a cycle capacity SOH mapped to each of a plurality of temperatures.

[0136] Cycle number m 0 500 1000 1500 2000 2500 3000 … 7000 7500 8000 Cycle capacity SOH 100 99 98 97 94 90 88 … 66 63 60

[0137] For example, assuming that the current number of cycles is 500, the cycle capacity SOH of 99 corresponding to the cycle number 500 in Table 1 is determined as the cycle capacity SOH of the energy storage system; assuming that the current number of cycles is 300, and this cycle number cannot be found in Table 1, it is necessary to process Table 1 accordingly according to the current number of cycles to obtain a new cycle capacity SOH, and this new cycle capacity SOH corresponds to the current number of cycles.

[0138] It can be seen that this optional implementation method can search for whether there is a target cycle number that is the same as the current cycle number among all the initial cycle numbers corresponding to the second mapping relationship based on the preset second mapping relationship between the number of times and the cycle capacity, and when it is found that there is a target cycle number that is the same as the current cycle number, based on the second mapping relationship, the first cycle capacity SOH corresponding to the target cycle number is determined as the cycle capacity SOH of the energy storage system, thereby improving the determination speed and efficiency of the cycle capacity SOH of the energy storage system, and when it is found that there is no target cycle number, based on the current cycle number, all initial cycle numbers and the initial cycle capacity SOH mapped to all initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number is generated as the cycle capacity SOH of the energy storage system, which can improve the accuracy and reliability of the generated cycle capacity SOH, and can improve the diversity and flexibility of the determination method of the cycle capacity SOH based on the second mapping relationship and the current cycle number.

[0139] In this optional embodiment, optionally, generating a second cycle capacity SOH mapped to the current cycle number based on the current cycle number, all initial cycle numbers, and the initial cycle capacity SOH mapped to all initial cycle numbers may include:

[0140] Calculate the difference between the current cycle number and each of all initial cycle numbers;

[0141] According to the difference between the current cycle number and all the initial cycle numbers, a first cycle number having the smallest absolute value of the difference between the current cycle number and all the initial cycle numbers is determined;

[0142] According to the difference between the current cycle number and all the initial cycle numbers, a second cycle number having the second smallest absolute value of the difference between the current cycle number and all the initial cycle numbers is determined;

[0143] The first cycle number and the initial cycle capacity SOH mapped to the first cycle number are used as the first value, the second cycle number and the initial cycle capacity SOH mapped to the second cycle number are used as the second value, and the current cycle number is used as the target value for linear interpolation calculation to obtain the second cycle capacity SOH mapped to the current cycle number.

[0144] In the embodiment of the present invention, specifically, the calculation formula of the second cycle capacity SOH based on the linear interpolation algorithm is as follows:

[0145] Y0=100-(Y2-Y1) / (X2-X1)*X0;

[0146] Where Y0 is the second cycle capacity SOH based on the linear interpolation algorithm, (X1, Y1) is the first value based on the linear interpolation algorithm, (X2, Y2) is the second value based on the linear interpolation algorithm, and X0 is the target value based on the linear interpolation algorithm. For example, assuming the current number of cycles is 300, the second cycle capacity SOH can be equal to 100-(100-99) / (500-0)*300=99.4 times, which is approximately equal to 100 times.

[0147] It can be seen that this optional implementation can also calculate the difference in number between the current cycle number and each initial cycle number among all initial cycle numbers, and based on the above-mentioned difference in number, determine the first cycle number with the smallest absolute value of the difference in number with the current cycle number and the second cycle number with the second smallest absolute value of the difference in number with the current cycle number from all initial cycle numbers, and then use the first cycle number and the initial cycle capacity SOH mapped thereto as the first value, the second cycle number and the initial cycle capacity SOH mapped thereto as the second value, and the current cycle number as the target value for linear interpolation calculation to obtain the second cycle capacity SOH mapped thereto, and can accurately filter out the input parameters required for the linear interpolation algorithm (the input parameters include the first value and the second value) through the current cycle number, and can improve the calculation accuracy and reliability of the second cycle capacity SOH based on the accurately filtered input parameters and the current cycle number.

[0148] In this optional embodiment, as another optional implementation, the above-mentioned determination of the cycle capacity impact factor of the energy storage system based on the pre-set first mapping relationship between temperature and cycle impact factor and the temperature data set may include:

[0149] Determine the maximum temperature data and the minimum temperature data from the temperature data set;

[0150] According to a preset first mapping relationship between temperature and cycle impact factor, a first cycle impact factor corresponding to the maximum temperature data is screened out from all cycle impact factors corresponding to the first mapping relationship;

[0151] According to the first mapping relationship, a second circulation influence factor corresponding to the minimum temperature data is screened out from all circulation influence factors corresponding to the first mapping relationship;

[0152] The one with the largest value from the first cycle impact factor and the second cycle impact factor is selected as the cycle capacity impact factor of the energy storage system.

[0153] In an embodiment of the present invention, a first mapping relationship is used to represent a mapping relationship between multiple temperatures and multiple cycle impact factors. For example, Table 2 is a first mapping relationship table between temperatures and cycle impact factors disclosed in an embodiment of the present invention. Referring to Table 2, the first mapping relationship table between temperatures and cycle impact factors includes a cycle impact factor mapped to each of the multiple temperatures.

[0154] Temperature (℃) -20 -10 0 10 25 45 60 Circulation Impact Factor 1.5 1.2 1 1 1 2 2.5

[0155] For example, based on Table 2, it can be concluded that the maximum temperature data is 60°C, the minimum temperature data is -20°C, the first cycle impact factor is 2.5, and the second cycle impact factor is 1.5. At this time, the value of the first cycle impact factor is the largest cycle impact factor compared to the second cycle impact factor. Therefore, the first cycle impact factor is determined as the cycle capacity impact factor of the energy storage system.

[0156] It can be seen that this optional implementation method can determine the maximum temperature data and the minimum temperature data from the temperature data set, and according to the pre-set first mapping relationship between temperature and cycle influence factor, screen out the first cycle influence factor corresponding to the maximum temperature data from all the cycle influence factors corresponding to the first mapping relationship, and according to the first mapping relationship, screen out the second cycle influence factor corresponding to the minimum temperature data from all the cycle influence factors corresponding to the first mapping relationship, which can improve the screening accuracy of the cycle influence factor corresponding to the maximum temperature and the cycle influence factor corresponding to the minimum temperature, and then screen out the one with the largest value from the first cycle influence factor and the second cycle influence factor as the cycle capacity influence factor of the energy storage system. By comparing the multiple cycle influence factors screened out, the screening accuracy and reliability of the cycle capacity influence factor can be improved, and the occurrence of cycle capacity calculation errors of the energy storage battery due to the low accuracy of the screened cycle capacity influence factor can be reduced.

[0157] Example 2

[0158] See also Figure 2 , Figure 2 This is a flow chart of a method for determining the health status of an energy storage system disclosed in an embodiment of the present invention. Figure 2 The described method for determining the health status of an energy storage system can be applied to a device for determining the health status of an energy storage system, wherein the device may include a determination device or a determination server, wherein the determination server may include a cloud server or a local server, which is not limited in the embodiment of the present invention. Figure 2 As shown, the method for determining the health status of the energy storage system may include the following operations:

[0159] 201. Obtain a temperature data set and an SOC data set of an energy storage battery of an energy storage system during a cyclic charge and discharge process.

[0160] 202. Determine the cycle capacity SOH of the energy storage system based on the temperature data set.

[0161] 203. Obtain a power-off time of each cycle of the energy storage system and a power-on time of each cycle of the energy storage system.

[0162] 204. Calculate the difference between each power-off time and the current time, and calculate the sum of the differences between all power-off times and the current time to obtain the historical calendar duration of the energy storage system.

[0163] In the embodiment of the present invention, the historical calendar duration of the energy storage system may be recorded as T1.

[0164] In the embodiment of the present invention, a cycle is a process corresponding to the energy storage battery of the energy storage system being fully charged and discharged.

[0165] 205. Calculate the difference between each power-off time and the next power-on time corresponding to the power-off time, and calculate the sum of the differences between all power-off times and the corresponding next power-on times to obtain the sleep duration of the energy storage system.

[0166] For example, for the last power-off time, the next power-on time corresponding to the last power-off time is the current power-on time. In this case, the difference between the last power-off time and the current power-on time needs to be calculated.

[0167] In an embodiment of the present invention, the sleep duration of the energy storage system can also be obtained by calculating the sum of all power-off times, calculating the sum of all power-on times, and then calculating the difference between the sum of all power-off times and the sum of all power-on times. Specifically, the calculation formula for the sleep duration of the energy storage system can be as follows:

[0168] T4 = T3 - T2;

[0169] Among them, T4 is the sleep time of the energy storage system, T3 is the sum of all power-on times, and T2 is the sum of all power-off times.

[0170] 206. Calculate the historical cumulative idle time of the energy storage system based on the temperature data set and the SOC data set.

[0171] In the embodiment of the present invention, there is no order of precedence among step 204, step 205 and step 206. For example, for step 206, step 206 may occur before step 204 / step 205, or after step 204 / step 205, or simultaneously with step 204 / step 205; for step 205, step 205 may occur before step 204 / step 206, or after step 204 / step 206, or simultaneously with step 204 / step 206; for step 204, step 204 may occur before step 205 / step 206, or after step 205 / step 206, or simultaneously with step 205 / step 206, and the embodiment of the present invention does not limit this.

[0172] 207. Calculate the sum of the historical calendar duration, the dormant duration, and the historical cumulative static duration of the energy storage system to obtain the total calendar duration of the energy storage system.

[0173] In the embodiment of the present invention, the calculation formula for the total calendar duration of the energy storage system is as follows:

[0174] T 日历寿命 =T1+T4+T5;

[0175] Among them, T 日历寿命 is the total calendar duration of the energy storage system, T1 is the historical calendar duration of the energy storage system, T4 is the dormancy duration of the energy storage system, and T5 is the historical accumulated static duration of the energy storage system.

[0176] 208. Determine the calendar life SOH of the energy storage system according to a third mapping relationship between a preset duration and a calendar life and the total calendar duration of the energy storage system.

[0177] In an embodiment of the present invention, a third mapping relationship is used to represent a mapping relationship between multiple preset initial total calendar durations and multiple preset initial calendar lifespans (SOHs). For example, Table 3 is a third mapping relationship table between durations and calendar lifespans disclosed in an embodiment of the present invention. Referring to Table 3, the third mapping relationship table between durations and calendar lifespans includes an initial calendar lifespan SOH mapped to each initial total calendar duration.

[0178] <![CDATA[T 日历寿命 (Year)]]> 0 0.5 1 2 3 4 … 9 10 11 Calendar life SOH 100 99.9 99 97 95 93 … 68 63 60

[0179] Among them, T 日历寿命 is the initial total calendar duration mentioned above. For example, when the total calendar duration of the energy storage system is 0.5, the calendar life SOH of the energy storage system is 99.9; when the total calendar duration of the energy storage system is 2, the calendar life SOH of the energy storage system is 97.

[0180] 209. Based on the preset fusion algorithm, the cycle capacity SOH and the calendar life SOH are fused to obtain the current health status of the energy storage system.

[0181] In the embodiment of the present invention, for other descriptions of step 201, step 202 and step 209, please refer to the detailed description of step 101, step 102 and step 104 in embodiment 1, which will not be repeated in this embodiment of the present invention.

[0182] It can be seen that implementation Figure 2 The described method for determining the health status of the energy storage system can obtain the temperature data set of the energy storage battery of the energy storage system and the SOC data set of the energy storage battery during the cyclic charge and discharge process, and determine the cycle capacity SOH of the energy storage system based on the temperature data set, which can improve the accuracy of determining the cycle capacity SOH of the energy storage system, and determine the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set, which can improve the accuracy of determining the calendar life SOH of the energy storage system, and can flexibly realize the calculation of different types of life data of the energy storage system through multiple data, and then based on the preset fusion algorithm, the accurately determined cycle capacity SOH and calendar life SOH are fused to obtain the target SOH of the energy storage system, which can improve the accuracy of determining the target SOH of the energy storage system, thereby facilitating the accurate prediction of the remaining life of the energy storage system battery based on the accurately determined target SOH, and further facilitating the improvement of the accuracy of the formulation of subsequent maintenance plans for the energy storage system. In addition, the power-off time and power-on time of each cycle of the energy storage system can be obtained, and the difference between each power-off time and the current time and the sum of the differences between all power-off times and the current time can be calculated to obtain the historical calendar duration of the energy storage system, thereby improving the accuracy and reliability of calculating the historical calendar duration of the energy storage system. The difference between each power-off time and the next power-on time corresponding to the power-off time and the sum of the differences between all power-off times and the corresponding next power-on time can also be calculated to obtain the sleep duration of the energy storage system. Accurate calculation of the sleep duration of the energy storage system can be achieved based on the power-on and power-off times. The historical cumulative rest time of the energy storage system can be calculated based on the temperature data set and the SOC data set. The accuracy of calculating the historical cumulative rest time of the energy storage system can be improved by using the temperature and SOC data sets. Subsequently, the sum of the historical calendar duration, the rest time, and the historical cumulative rest time is calculated to obtain the total calendar duration of the energy storage system. The calendar life (SOH) of the energy storage system is then determined based on a third mapping relationship between the preset duration and the calendar life and the total calendar duration, thereby improving the accuracy of determining the calendar life (SOH) based on the temperature and SOC data sets.

[0183] In an optional embodiment, the calculation of the historical cumulative idle time of the energy storage system based on the temperature data set and the SOC data set in step 206 may include:

[0184] Obtaining a charge and discharge current set of the energy storage system during each cycle, where the charge and discharge current set includes one or more charge and discharge currents;

[0185] For each cycle, detecting whether there is a target charge / discharge current less than or equal to a preset current in the set of charge / discharge currents of the energy storage system within that cycle; and when detecting that there is a target charge / discharge current less than or equal to the preset current in the set of charge / discharge currents of the energy storage system within that cycle, detecting whether the duration of charge / discharge during which the target charge / discharge current is less than or equal to the preset current is greater than or equal to a preset duration of detection;

[0186] If the target charge / discharge current is detected to be less than or equal to the preset current and the duration of charge / discharge is greater than or equal to the duration of the continuous detection, the static time of the energy storage system in the cycle is calculated based on the charge / discharge duration, the temperature data set, and the SOC data set of the cycle;

[0187] The static time of the energy storage system in all cycles is accumulated to obtain the historical cumulative static time of the energy storage system.

[0188] In the embodiment of the present invention, the target charge and discharge current can be either positive or negative. The charge and discharge current corresponding to the moment after the end of the rest period is greater than the preset current. Each SOC data point in the SOC data set and each temperature data point in the temperature data set has a corresponding charge and discharge moment.

[0189] For example, if the absolute value of the charge and discharge current in a cycle is less than 3A and the duration of the absolute value of the charge and discharge current being less than 3A is greater than 1 hour, then the static time of the energy storage system in the cycle is calculated based on the charge and discharge duration of the cycle, the temperature data set, and the SOC data set.

[0190] It can be seen that this optional embodiment can obtain the charge and discharge current set of the energy storage system during each cycle (the charge and discharge current set includes one or more charge and discharge currents), and then detect whether there is a target charge and discharge current less than or equal to the preset current in the charge and discharge current set within each cycle; and when it is detected that there is a target charge and discharge current less than or equal to the preset current in the charge and discharge current set of the energy storage system within the cycle, it is detected whether the charge and discharge duration during which the target charge and discharge current is less than or equal to the preset current is greater than or equal to the preset continuous detection duration. If it is detected that it exists, the static duration of the energy storage system within the cycle is accurately calculated based on the charge and discharge duration, temperature data set, and SOC data set of the cycle, and the static duration of the energy storage system in all cycles is accumulated to obtain the historical cumulative static duration of the energy storage system, which can improve the calculation accuracy and reliability of the historical cumulative static duration.

[0191] In this optional embodiment, as an optional implementation, for each cycle, calculating the static time of the energy storage system in the cycle based on the charge and discharge duration, the temperature data set, and the SOC data set of the cycle may include:

[0192] Determining the calendar life impact factor of each target charge and discharge moment in all target charge and discharge moments included in the charge and discharge duration of the cycle according to a preset fourth mapping relationship between temperature / SOC and calendar impact factor;

[0193] The target charge and discharge currents corresponding to all target charge and discharge moments and the calendar life impact factors of all target charge and discharge moments are matched according to all target charge and discharge moments to obtain all target matching groups of the cycle, and the target charge and discharge moments corresponding to the target charge and discharge currents in each target matching group are the same as the target charge and discharge moments of the calendar life impact factors in the target matching group;

[0194] The integration calculation is performed on all target matching groups of the cycle to obtain the static time of the energy storage system in the cycle.

[0195] In this embodiment of the present invention, the fourth mapping relationship between temperature / SOC and calendar impact factor is used to represent the mapping relationship between preset temperature data and preset calendar impact factors, as well as between preset SOC data and calendar impact factors. For example, Table 4 is a fourth mapping relationship table between temperature / SOC and calendar impact factors disclosed in this embodiment of the present invention. Referring to Table 4, the fourth mapping relationship table between temperature / SOC and calendar impact factor includes a calendar life SOH mapped to each temperature data and each SOC data.

[0196]

[0197] For example, when the temperature of the energy storage system is 25°C and the SOC is 90%, the calendar life impact factor is 2; when the temperature of the energy storage system is 25°C and the SOC is 100%, the calendar life impact factor is 3; when the temperature of the energy storage system is 45°C and the SOC is 90%, the calendar life impact factor is 4.

[0198] In the embodiment of the present invention, the calculation formula for the static time of the energy storage system in each cycle is as follows:

[0199] T5=∫i′*r;

[0200] Wherein, T5 is the static time of the energy storage system in each cycle, i' is the target charge and discharge current of the energy storage battery in the cycle, and r is the calendar life impact factor at each target charge and discharge moment.

[0201] It can be seen that this optional implementation method can determine the calendar life impact factor of each target charge and discharge moment among all target charge and discharge moments included in the charge and discharge duration of the cycle based on the fourth mapping relationship between the preset temperature / SOC-calendar impact factor, thereby improving the accuracy of determining the calendar life impact factor. Subsequently, all target charge and discharge currents and calendar life impact factors in each cycle are matched according to the target charge and discharge moments to obtain all target matching groups of the cycle, and all target matching groups of the cycle are integrated and calculated to obtain the rest time of the energy storage system in the cycle. This can improve the accuracy and reliability of calculating the rest time of the energy storage system by using the calendar life impact factor based on temperature and SOC.

[0202] In an optional embodiment, the above step 209, based on a preset fusion algorithm, fuses the cycle capacity SOH and the calendar life SOH to obtain the current health status of the energy storage system, which may include:

[0203] Acquire an initial SOH data set of the energy storage system, where the initial SOH data set includes one or more combinations of an initial cycle capacity SOH of the energy storage system, an initial calendar life SOH of the energy storage system, and an initial health state of the energy storage system;

[0204] Calculate the difference between the cycle capacity SOH and the initial cycle capacity SOH to obtain the cycle capacity attenuation value;

[0205] Calculate the difference between the calendar life SOH and the initial calendar life SOH to obtain the calendar life attenuation value;

[0206] Based on a preset fusion algorithm, the current state of health of the energy storage system is calculated based on the initial health state, cycle capacity decay value, and calendar life decay value. This can improve the accuracy and reliability of the energy storage system's current health state by fusing the cycle capacity SOH and calendar life SOH of the energy storage system.

[0207] Specifically, the calculation formula for the health status based on the above fusion algorithm is as follows:

[0208] SOH 系统 =SOH′ 系统 -(SOH′ 循环容量 -SOH 循环容量 )-(SOH′ 日历寿命 -SOH 日历寿命 );

[0209] Among them, SOH 系统 The current health status of the energy storage system, SOH 循环容量 is the cycle capacity of the energy storage system SOH, SOH' 循环容量is the initial cycle capacity SOH of the energy storage system, SOH 日历寿命 is the calendar life of the energy storage system SOH, SOH' 日历寿命 is the initial calendar life of the energy storage system SOH, SOH' 系统 is the initial health state of the energy storage system, where the values ​​of the initial cycle capacity SOH, initial calendar life SOH and initial health state can all be 100.

[0210] For example, Figure 3 As shown, Figure 3 This is a flow chart of another method for determining the health status of an energy storage system disclosed in an embodiment of the present invention, wherein: Figure 3 The described method for determining the health status of an energy storage system may include the following steps:

[0211] 301. Calculation of cycle life SOH.

[0212] 302. Calculation of calendar life SOH.

[0213] 303, SOH 系统 =100-(100-SOH 循环容量 )-(100-SOH 日历寿命 ).

[0214] For example, Figure 4 As shown, Figure 4 This is a flow chart of a method for calculating cycle life SOH disclosed in an embodiment of the present invention, wherein: Figure 4 The described cycle life SOH calculation method may include the following steps:

[0215] 3011. Calculate the cycle capacity influence factor n corresponding to the temperature by looking up the table.

[0216] 3012. Calculate the cycle capacity q based on temperature effects.

[0217] 3013. Calculate the current energy storage battery cycle number m.

[0218] 3014. Calculate the cycle capacity SOH by looking up the table.

[0219] For example, Figure 5 As shown, Figure 5 This is a flow chart of a calendar life SOH calculation method disclosed in an embodiment of the present invention, wherein: Figure 5 The described calendar life SOH calculation method may include the following steps:

[0220] 3021. Get the historical calendar duration T1.

[0221] 3022. Calculate the sleep duration T4.

[0222] 3023. Calculate the historical cumulative static time T5.

[0223] 3024. Calculate the total calendar duration T 日历寿命 .

[0224] 3025. Calculate calendar life SOH by looking up the table.

[0225] Example 3

[0226] See also Figure 6 , Figure 6 This is a schematic diagram of the structure of a device for determining the health status of an energy storage system disclosed in an embodiment of the present invention. Figure 6 The described apparatus for determining the health status of the energy storage system may include a determination device or a determination server, wherein the determination server may include a cloud server or a local server, which is not limited in the embodiment of the present invention. Figure 6 As shown, the health status determination device of the energy storage system may include:

[0227] The acquisition module 401 is used to acquire a temperature data set and an SOC data set of the energy storage battery of the energy storage system during a cyclic charge and discharge process.

[0228] The determination module 402 is configured to determine the cycle capacity SOH of the energy storage system according to the temperature data set.

[0229] The determination module 402 is further configured to determine the calendar life SOH of the energy storage system according to the temperature data set and the SOC data set.

[0230] The fusion module 403 is used to fuse the cycle capacity SOH and the calendar life SOH based on a preset fusion algorithm to obtain the current health status of the energy storage system.

[0231] It can be seen that implementation Figure 6The described device for determining the health status of the energy storage system can obtain the temperature data set of the energy storage battery and the SOC data set of the energy storage battery during the cyclic charge and discharge process of the energy storage system, and determine the cycle capacity SOH of the energy storage system based on the temperature data set, which can improve the accuracy of determining the cycle capacity SOH of the energy storage system, and determine the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set, which can improve the accuracy of determining the calendar life SOH of the energy storage system, and can flexibly realize the calculation of different types of life data of the energy storage system through multiple data, and then based on the preset fusion algorithm, the accurately determined cycle capacity SOH and calendar life SOH are fused to obtain the target SOH of the energy storage system, which can improve the accuracy of determining the target SOH of the energy storage system, thereby facilitating the accurate prediction of the remaining life of the energy storage system battery based on the accurately determined target SOH, and further facilitating the improvement of the accuracy of the formulation of subsequent maintenance plans for the energy storage system.

[0232] In an optional embodiment, the temperature data set includes a plurality of temperature data. And the determination module 402 determines the cycle capacity SOH of the energy storage system according to the temperature data set in a manner that specifically includes:

[0233] Obtain the current and rated capacity of the energy storage battery;

[0234] Determining a cycle capacity impact factor of the energy storage system based on a pre-set first mapping relationship between temperature and cycle impact factor and a temperature data set;

[0235] Based on the cycle capacity influencing factor, the current of the energy storage battery is integrated and calculated to obtain the battery cycle capacity of the energy storage battery;

[0236] Calculate the current cycle number of the energy storage battery based on the battery cycle capacity and the rated capacity of the energy storage battery;

[0237] The cycle capacity SOH of the energy storage system is determined according to a second mapping relationship between the preset number of times and the cycle capacity and the current number of cycles.

[0238] It can be seen that this optional embodiment can determine the cycle capacity influence factor of the energy storage system based on the first mapping relationship between the preset temperature and the cycle influence factor, and the temperature data set, and can improve the accuracy of determining the cycle capacity influence factor of the energy storage battery based on the temperature data set of the energy storage battery. Subsequently, based on the accurately determined cycle capacity influence factor, the acquired current of the energy storage battery is integrated and calculated to obtain the battery cycle capacity of the energy storage battery, which can improve the accuracy and reliability of the calculated battery cycle capacity. Then, based on the accurately calculated battery cycle capacity and the acquired rated capacity of the energy storage battery, the current cycle number of the energy storage battery is accurately calculated, and the cycle capacity SOH of the energy storage system is determined based on the preset second mapping relationship between the number and the cycle capacity, and the accurately calculated current cycle number. The accuracy of determining the cycle capacity SOH can be improved by using the cycle capacity influence factor based on the temperature data set.

[0239] In this optional embodiment, as an optional implementation manner, the determination module 402 determines the cycle capacity SOH of the energy storage system according to the second mapping relationship between the preset number of times and the cycle capacity and the current cycle number, which may specifically include:

[0240] According to a preset second mapping relationship between the number of cycles and the cycle capacity, searching for a target cycle number that is the same as the current cycle number among all initial cycle numbers corresponding to the second mapping relationship;

[0241] When a target cycle number that is the same as the current cycle number is found among all the initial cycle numbers, the first cycle capacity SOH mapped to the target cycle number is determined as the cycle capacity SOH of the energy storage system based on the second mapping relationship;

[0242] When it is found that there is no target cycle number that is the same as the current cycle number among all the initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number is generated based on the current cycle number, all the initial cycle numbers and the initial cycle capacity SOH mapped to all the initial cycle numbers, and the second cycle capacity SOH is determined as the cycle capacity SOH of the energy storage system.

[0243] It can be seen that this optional implementation method can search for whether there is a target cycle number that is the same as the current cycle number among all the initial cycle numbers corresponding to the second mapping relationship based on the preset second mapping relationship between the number of times and the cycle capacity, and when it is found that there is a target cycle number that is the same as the current cycle number, based on the second mapping relationship, the first cycle capacity SOH corresponding to the target cycle number is determined as the cycle capacity SOH of the energy storage system, thereby improving the determination speed and efficiency of the cycle capacity SOH of the energy storage system, and when it is found that there is no target cycle number, based on the current cycle number, all initial cycle numbers and the initial cycle capacity SOH mapped to all initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number is generated as the cycle capacity SOH of the energy storage system, which can improve the accuracy and reliability of the generated cycle capacity SOH, and can improve the diversity and flexibility of the determination method of the cycle capacity SOH based on the second mapping relationship and the current cycle number.

[0244] In this optional embodiment, the determination module 402 may generate a second cycle capacity SOH mapped to the current cycle number based on the current cycle number, all initial cycle numbers, and the initial cycle capacity SOH mapped to all initial cycle numbers, in a manner that may specifically include:

[0245] Calculate the difference between the current cycle number and each of all initial cycle numbers;

[0246] According to the difference between the current cycle number and all the initial cycle numbers, a first cycle number having the smallest absolute value of the difference between the current cycle number and all the initial cycle numbers is determined;

[0247] According to the difference between the current cycle number and all the initial cycle numbers, a second cycle number having the second smallest absolute value of the difference between the current cycle number and all the initial cycle numbers is determined;

[0248] The first cycle number and the initial cycle capacity SOH mapped to the first cycle number are used as the first value, the second cycle number and the initial cycle capacity SOH mapped to the second cycle number are used as the second value, and the current cycle number is used as the target value for linear interpolation calculation to obtain the second cycle capacity SOH mapped to the current cycle number.

[0249] It can be seen that this optional implementation can also calculate the difference in number between the current cycle number and each initial cycle number among all initial cycle numbers, and based on the above-mentioned difference in number, determine the first cycle number with the smallest absolute value of the difference in number with the current cycle number and the second cycle number with the second smallest absolute value of the difference in number with the current cycle number from all initial cycle numbers, and then use the first cycle number and the initial cycle capacity SOH mapped thereto as the first value, the second cycle number and the initial cycle capacity SOH mapped thereto as the second value, and the current cycle number as the target value for linear interpolation calculation to obtain the second cycle capacity SOH mapped thereto, and can accurately filter out the input parameters required for the linear interpolation algorithm (the input parameters include the first value and the second value) through the current cycle number, and can improve the calculation accuracy and reliability of the second cycle capacity SOH based on the accurately filtered input parameters and the current cycle number.

[0250] In another optional embodiment, the determination module 402 may determine the cycle capacity impact factor of the energy storage system according to the preset first mapping relationship between temperature and cycle impact factor and the temperature data set, specifically by:

[0251] Determine the maximum temperature data and the minimum temperature data from the temperature data set;

[0252] According to a preset first mapping relationship between temperature and cycle impact factor, a first cycle impact factor corresponding to the maximum temperature data is screened out from all cycle impact factors corresponding to the first mapping relationship;

[0253] According to the first mapping relationship, a second circulation influence factor corresponding to the minimum temperature data is screened out from all circulation influence factors corresponding to the first mapping relationship;

[0254] The one with the largest value from the first cycle impact factor and the second cycle impact factor is selected as the cycle capacity impact factor of the energy storage system.

[0255] It can be seen that this optional embodiment can determine the maximum temperature data and the minimum temperature data from the temperature data set, and according to the pre-set first mapping relationship between temperature and cycle influence factor, screen out the first cycle influence factor corresponding to the maximum temperature data from all cycle influence factors corresponding to the first mapping relationship, and according to the first mapping relationship, screen out the second cycle influence factor corresponding to the minimum temperature data from all cycle influence factors corresponding to the first mapping relationship, which can improve the screening accuracy of the cycle influence factor corresponding to the maximum temperature and the cycle influence factor corresponding to the minimum temperature, and then screen out the one with the largest value from the first cycle influence factor and the second cycle influence factor as the cycle capacity influence factor of the energy storage system. By comparing the multiple cycle influence factors screened out, the screening accuracy and reliability of the cycle capacity influence factor can be improved, and the occurrence of cycle capacity calculation errors of the energy storage battery due to the low accuracy of the screened cycle capacity influence factor can be reduced.

[0256] In this optional embodiment, as an optional implementation manner, the determination module 402 determines the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set, which may specifically include:

[0257] Obtain the power-off time and power-on time of each cycle of the energy storage system, calculate the difference between each power-off time and the current time, and calculate the sum of the differences between all power-off times and the current time to obtain the historical calendar length of the energy storage system. A cycle is the process corresponding to the energy storage system's energy storage battery from being fully charged to being discharged;

[0258] Calculate the difference between each power-off time and the next power-on time corresponding to the power-off time, and calculate the sum of the differences between all power-off times and the corresponding next power-on times to obtain the sleep duration of the energy storage system;

[0259] Calculate the historical cumulative static time of the energy storage system based on the temperature data set and the SOC data set;

[0260] Calculate the sum of the historical calendar duration, the dormant duration, and the historical cumulative static duration of the energy storage system to obtain the total calendar duration of the energy storage system;

[0261] The calendar life SOH of the energy storage system is determined according to a third mapping relationship between a preset duration and a calendar life and the total calendar duration of the energy storage system.

[0262] As can be seen, this optional embodiment can obtain the power-off time and power-on time of each cycle of the energy storage system, calculate the difference between each power-off time and the current time, and the sum of the differences between all power-off times and the current time, to obtain the historical calendar duration of the energy storage system, thereby improving the accuracy and reliability of calculating the historical calendar duration of the energy storage system. Furthermore, the difference between each power-off time and the next power-on time corresponding to the power-off time, and the sum of the differences between all power-off times and the corresponding next power-on time, are calculated to obtain the sleep duration of the energy storage system. Accurate calculation of the sleep duration of the energy storage system can be achieved based on the power-on and power-off times. Furthermore, the historical cumulative rest duration of the energy storage system is calculated based on the temperature data set and the SOC data set, thereby achieving accurate calculation of the historical cumulative rest duration of the energy storage system based on the temperature and SOC data sets. Subsequently, the sum of the historical calendar duration, the rest duration, and the historical cumulative rest duration is calculated to obtain the total calendar duration of the energy storage system. The calendar life (SOH) of the energy storage system is then determined based on a third mapping relationship between a preset duration and the calendar life and the total calendar duration, thereby improving the accuracy of determining the calendar life (SOH) based on the temperature and SOC.

[0263] In this optional embodiment, as an optional implementation, the determination module 402 may calculate the historical cumulative idle time of the energy storage system based on the temperature data set and the SOC data set by:

[0264] Obtaining a charge and discharge current set of the energy storage system during each cycle, where the charge and discharge current set includes one or more charge and discharge currents;

[0265] For each cycle, detecting whether there is a target charge / discharge current less than or equal to a preset current in the set of charge / discharge currents of the energy storage system within that cycle; and when detecting that there is a target charge / discharge current less than or equal to the preset current in the set of charge / discharge currents of the energy storage system within that cycle, detecting whether the duration of charge / discharge during which the target charge / discharge current is less than or equal to the preset current is greater than or equal to a preset duration of detection;

[0266] If the target charge and discharge current is detected to be less than or equal to the preset current and the charge and discharge duration is greater than or equal to the continuous detection duration, then the static duration of the energy storage system in the cycle is calculated based on the charge and discharge duration of the cycle, the temperature data set, and the SOC data set. The charge and discharge current corresponding to the moment after the end of the static duration is greater than the preset current, and each SOC data in the SOC data set and each temperature data in the temperature data set have a corresponding charge and discharge time.

[0267] The static time of the energy storage system in all cycles is accumulated to obtain the historical cumulative static time of the energy storage system.

[0268] It can be seen that this optional implementation method can obtain the charge and discharge current set of the energy storage system during each cycle (the charge and discharge current set includes one or more charge and discharge currents), and then detect whether there is a target charge and discharge current less than or equal to the preset current in the charge and discharge current set within each cycle; and when it is detected that there is a target charge and discharge current less than or equal to the preset current in the charge and discharge current set of the energy storage system within the cycle, it is detected whether the charge and discharge duration during which the target charge and discharge current is less than or equal to the preset current is greater than or equal to the preset continuous detection duration. If it is detected that it exists, the static duration of the energy storage system in the cycle is accurately calculated based on the charge and discharge duration, temperature data set, and SOC data set of the cycle, and the static duration of the energy storage system in all cycles is accumulated to obtain the historical cumulative static duration of the energy storage system, which can improve the calculation accuracy and reliability of the historical cumulative static duration.

[0269] In this optional embodiment, optionally, for each cycle, the determination module 402 calculates the static time of the energy storage system in the cycle based on the charge and discharge duration, the temperature data set, and the SOC data set of the cycle, specifically by:

[0270] Determining the calendar life impact factor of each target charge and discharge moment in all target charge and discharge moments included in the charge and discharge duration of the cycle according to a preset fourth mapping relationship between temperature / SOC and calendar impact factor;

[0271] The target charge and discharge currents corresponding to all target charge and discharge moments and the calendar life impact factors of all target charge and discharge moments are matched according to all target charge and discharge moments to obtain all target matching groups of the cycle, and the target charge and discharge moments corresponding to the target charge and discharge currents in each target matching group are the same as the target charge and discharge moments of the calendar life impact factors in the target matching group;

[0272] The integration calculation is performed on all target matching groups of the cycle to obtain the static time of the energy storage system in the cycle.

[0273] It can be seen that this optional implementation can also determine the calendar life impact factor of each target charge and discharge moment among all target charge and discharge moments included in the charge and discharge duration of the cycle based on the fourth mapping relationship between the preset temperature / SOC-calendar impact factor, thereby improving the accuracy of determining the calendar life impact factor. Subsequently, all target charge and discharge currents and calendar life impact factors in each cycle are matched according to the target charge and discharge moments to obtain all target matching groups of the cycle, and all target matching groups of the cycle are integrated and calculated to obtain the rest time of the energy storage system in the cycle. This can improve the accuracy and reliability of calculating the rest time of the energy storage system by using the calendar life impact factor based on temperature and SOC.

[0274] Example 4

[0275] See also Figure 7 , Figure 7 FIG. 1 is a structural diagram of another device for determining the health status of an energy storage system disclosed in an embodiment of the present invention. Figure 7 As shown, the health status determination device of the energy storage system may include:

[0276] A memory 501 storing executable program code;

[0277] a processor 502 coupled to the memory 501;

[0278] The processor 502 calls the executable program code stored in the memory 501 to execute the steps of the method for determining the health status of the energy storage system described in the first embodiment or the second embodiment of the present invention.

[0279] Example 5

[0280] An embodiment of the present invention discloses a computer storage medium storing computer instructions. When the computer instructions are called, they are used to execute the steps of the method for determining the health status of an energy storage system described in Embodiment 1 or Embodiment 2 of the present invention.

[0281] Example 6

[0282] An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute the steps of the method for determining the health status of an energy storage system described in Example 1 or Example 2.

[0283] The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, i.e., they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Those skilled in the art can understand and implement the present invention without inventive effort.

[0284] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus the necessary general hardware platform, or of course, by means of hardware. Based on this understanding, the above technical solution, in essence, or the portion that contributes to the prior art, can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, including a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0285] Finally, it should be noted that the method and device for determining the health status of an energy storage system and the storage medium disclosed in the embodiments of the present invention are only preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for determining the health status of an energy storage system, characterized in that: The method comprises: Acquire a temperature data set of an energy storage battery of an energy storage system and a SOC data set of the energy storage battery during a cyclic charge and discharge process; Determining a cycle capacity (SOH) of the energy storage system based on the temperature data set; and determining a calendar life (SOH) of the energy storage system based on the temperature data set and the SOC data set; Based on a preset fusion algorithm, the cycle capacity SOH and the calendar life SOH are fused to obtain the current health status of the energy storage system; Wherein, the temperature data set includes a plurality of temperature data; And, determining the cycle capacity SOH of the energy storage system according to the temperature data set includes: Obtaining the current of the energy storage battery and the rated capacity of the energy storage battery; Determining a cycle capacity impact factor of the energy storage system according to a preset first mapping relationship between temperature and cycle impact factor and the temperature data set; Based on the cycle capacity influencing factor, integrating the current of the energy storage battery to obtain the battery cycle capacity of the energy storage battery; Calculating the current cycle number of the energy storage battery according to the battery cycle capacity and the rated capacity of the energy storage battery; Determining the cycle capacity SOH of the energy storage system according to a second mapping relationship between a preset number of times and a cycle capacity and the current number of cycles; And, determining the calendar life SOH of the energy storage system based on the temperature data set and the SOC data set includes: Obtaining the power-off time and the power-on time of each cycle of the energy storage system, calculating the difference between each power-off time and the current time, and calculating the sum of all the differences between the power-off time and the current time, to obtain the historical calendar duration of the energy storage system, where the cycle corresponds to the process of the energy storage battery of the energy storage system from being fully charged to being discharged; Calculating the difference between each power-off time and the next power-on time corresponding to the power-off time, and calculating the sum of the differences between all power-off times and the corresponding next power-on times to obtain the sleep duration of the energy storage system; Calculating a historical cumulative static time of the energy storage system based on the temperature data set and the SOC data set; Calculating the sum of the historical calendar duration, the dormancy duration, and the historical accumulated static duration of the energy storage system to obtain the total calendar duration of the energy storage system; The calendar life SOH of the energy storage system is determined according to a third mapping relationship between a preset duration and a calendar life, and the total calendar duration of the energy storage system.

2. The method for determining the health status of an energy storage system according to claim 1, wherein: The determining the cycle capacity SOH of the energy storage system according to the second mapping relationship between the preset number of times and the cycle capacity and the current number of cycles includes: According to a preset second mapping relationship between the number of cycles and the cycle capacity, searching among all initial cycle numbers corresponding to the second mapping relationship whether there is a target cycle number that is the same as the current cycle number; When it is found that there is a target cycle number that is the same as the current cycle number among all the initial cycle numbers, based on the second mapping relationship, the first cycle capacity SOH mapped to the target cycle number is determined as the cycle capacity SOH of the energy storage system; When it is found that there is no target cycle number that is the same as the current cycle number among all the initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number is generated based on the current cycle number, all the initial cycle numbers and the initial cycle capacity SOH mapped to all the initial cycle numbers, and the second cycle capacity SOH is determined as the cycle capacity SOH of the energy storage system.

3. The method for determining the health status of an energy storage system according to claim 2, wherein: The generating, according to the current cycle number, all the initial cycle numbers, and the initial cycle capacities SOH mapped to all the initial cycle numbers, a second cycle capacity SOH mapped to the current cycle number, includes: Calculating the difference between the current cycle number and each of the initial cycle numbers; According to the number difference between the current cycle number and all the initial cycle numbers, determining a first cycle number from all the initial cycle numbers, the first cycle number having the smallest absolute value of the number difference with the current cycle number; According to the number difference between the current cycle number and all the initial cycle numbers, determining a second cycle number from all the initial cycle numbers, the second cycle number having the second smallest absolute value of the number difference between the current cycle number and the initial cycle number; The first cycle number and the initial cycle capacity SOH mapped to the first cycle number are used as the first value, the second cycle number and the initial cycle capacity SOH mapped to the second cycle number are used as the second value, and the current cycle number is used as the target value for linear interpolation calculation to obtain the second cycle capacity SOH mapped to the current cycle number.

4. The method for determining the health status of an energy storage system according to any one of claims 1 to 3, characterized in that: The determining of the cycle capacity impact factor of the energy storage system according to a preset first mapping relationship between temperature and cycle impact factor and the temperature data set includes: Determining maximum temperature data and minimum temperature data from the temperature data set; According to a preset first mapping relationship between temperature and cycle impact factor, screening out a first cycle impact factor corresponding to the maximum temperature data from all cycle impact factors corresponding to the first mapping relationship; According to the first mapping relationship, a second circulation influence factor corresponding to the minimum temperature data is filtered out from all the circulation influence factors corresponding to the first mapping relationship; The one with the largest value is selected from the first cycle impact factor and the second cycle impact factor as the cycle capacity impact factor of the energy storage system.

5. The method for determining the health status of an energy storage system according to any one of claims 1 to 3, characterized in that: The calculating, based on the temperature data set and the SOC data set, the historical cumulative static time of the energy storage system includes: Obtaining a charge and discharge current set of the energy storage system during each cycle, wherein the charge and discharge current set includes one or more charge and discharge currents; For each of the cycles, detecting whether there is a target charge / discharge current less than or equal to a preset current in the set of charge / discharge currents of the energy storage system within the cycle; and when detecting that there is a target charge / discharge current less than or equal to the preset current in the set of charge / discharge currents of the energy storage system within the cycle, detecting whether a duration of charge / discharge during which the target charge / discharge current is less than or equal to the preset current is greater than or equal to a preset duration of detection; If it is detected that the target charge / discharge current is less than or equal to the preset current and the charge / discharge duration is greater than or equal to the continuous detection duration, then the static duration of the energy storage system in the cycle is calculated based on the charge / discharge duration of the cycle, the temperature data set, and the SOC data set, and the charge / discharge current corresponding to the moment after the end of the static duration is greater than the preset current; The static duration of the energy storage system in all cycles is accumulated to obtain a historical cumulative static duration of the energy storage system.

6. The method for determining the health status of an energy storage system according to claim 5, characterized in that: For each of the cycles, each SOC data in the SOC data set and each temperature data in the temperature data set have corresponding charge and discharge times; Furthermore, calculating the static duration of the energy storage system in the cycle based on the charge and discharge duration of the cycle, the temperature data set, and the SOC data set includes: Determining, based on a preset fourth mapping relationship between temperature / SOC and calendar impact factor, a calendar life impact factor for each of all target charge and discharge moments included in the charge and discharge duration of the cycle; The target charge and discharge currents corresponding to all the target charge and discharge times and the calendar life impact factors of all the target charge and discharge times are matched according to all the target charge and discharge times to obtain all target matching groups of the cycle, wherein the target charge and discharge time corresponding to the target charge and discharge current in each target matching group is the same as the target charge and discharge time of the calendar life impact factor in the target matching group; An integral calculation is performed on all the target matching groups in the cycle to obtain the static time of the energy storage system in the cycle.

7. A device for determining the health status of an energy storage system, characterized in that: The device comprises: a memory storing executable program code; a processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the health status determination method of the energy storage system according to any one of claims 1 to 6.

8. A computer storage medium, characterized in that The computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the method for determining the health status of the energy storage system according to any one of claims 1 to 6.

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