Energy efficiency monitoring method and device, computer equipment and storage medium

Abstract

The invention discloses an energy efficiency monitoring method and device, computer equipment, a storage medium and a computer program product, and the method can obtain the first start-stop time of the accumulated charge capacity and the second start-stop time of the accumulated discharge capacity when the accumulated charge capacity and the accumulated discharge capacity of a to-be-detected battery are consistent, and can achieve the energy efficiency monitoring of the to-be-detected battery according to the first start-stop time and the second start-stop time. And determining the energy efficiency of the to-be-tested battery. According to the method, the energy efficiency calculation of the to-be-tested battery is realized according to the start-stop time of the accumulative charging capacity and the accumulative discharging capacity, and the method is not influenced by the charging working condition and the discharging working condition in the actual operation process of the to-be-tested battery.

Description

Energy efficiency monitoring method, device, computer equipment and storage medium Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy efficiency monitoring method, apparatus, computer equipment, storage medium, and computer program product. Background Art

[0002] Energy storage power stations are systems that use electrical energy storage devices to store, convert, and release cyclical electrical energy, primarily used to manage peak and valley power consumption. With the advancement of battery energy storage technology, energy storage power stations using batteries as energy storage devices have gradually matured, bringing significant convenience to people's daily electricity use.

[0003] Energy efficiency, which refers to the percentage of a battery's discharged energy relative to its charged energy under given conditions, is a key metric for evaluating battery performance. Traditional energy efficiency testing requires identical charging and discharging conditions. However, energy storage power stations require long-term operation under peak and frequency regulation switching conditions. Therefore, traditional energy efficiency testing is inadequate for battery energy storage power station applications.

[0004] Summary of the Invention

[0005] In view of the above problems, the present application provides an energy efficiency monitoring method, apparatus, computer equipment, storage medium and computer program product, which can realize energy efficiency analysis of the battery to be tested even if the energy storage power station operates for a long time under peak-shaving and frequency-regulating switching conditions, so as to meet the energy efficiency detection of batteries in the application scenario of energy storage power stations.

[0006] In a first aspect, the present application provides an energy efficiency monitoring method, comprising:

[0007] When the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharging capacity are obtained;

[0008] The energy efficiency of the battery to be tested is determined according to the first start-stop time and the second start-stop time.

[0009] The above energy efficiency monitoring method can obtain the first start and stop time of the cumulative charging capacity and the second start and stop time of the cumulative discharge capacity when the cumulative charging capacity and cumulative discharge capacity of the battery under test are consistent, and use the first start and stop time and the second start and stop time to determine the energy efficiency of the battery under test. This solution calculates the energy efficiency of the battery under test based on the start and stop times of the cumulative charging capacity and the cumulative discharge capacity. It is not affected by the charging and discharging conditions during the actual operation of the battery under test. Even if the energy storage power station operates for a long time under peak and frequency switching conditions, it can still perform energy efficiency analysis of the battery under test, meeting the requirements of battery energy efficiency testing in energy storage power station application scenarios.

[0010] In some embodiments, the obtaining of the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharge capacity when the cumulative charging capacity and the cumulative discharge capacity of the battery to be tested are consistent includes: obtaining operating parameters of the battery to be tested; and determining, based on the operating parameters, the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharge capacity when the cumulative charging capacity and the cumulative discharge capacity of the battery to be tested are consistent.

[0011] The above scheme, combined with the operating parameters of the battery under test during actual operation, determines the first start-stop time corresponding to the cumulative charging capacity and the second start-stop time corresponding to the cumulative discharge capacity when the cumulative charging capacity and the cumulative discharge capacity of the battery under test are consistent. The first start-stop time and the second start-stop time are associated with the actual operation of the battery under test to ensure the accuracy of energy efficiency monitoring.

[0012] In some embodiments, the determining, based on the operating parameters, of the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharge capacity when the cumulative charging capacity and the cumulative discharge capacity of the battery to be tested are consistent, includes: performing capacity calculation based on the operating parameters to determine the cumulative charging capacity and the cumulative discharge capacity of the battery to be tested; using the start time and end time of the capacity calculation of the cumulative charging capacity when the cumulative charging capacity and the cumulative discharge capacity are consistent as the first start and stop time, and the start time and end time of the capacity calculation of the cumulative discharge capacity as the second start and stop time.

[0013] In the above scheme, when the calculated cumulative charging capacity and the cumulative discharging capacity are consistent, the start time and end time of the cumulative charging capacity calculation are used as the first start-stop time, and the start time and end time of the cumulative discharging capacity calculation are used as the second start-stop time, thereby ensuring the accuracy of the first start-stop time and the second start-stop time and improving the accuracy of the energy efficiency of the battery to be tested.

[0014] In some embodiments, the accumulated charging capacity and the accumulated discharging capacity are consistent, including: the accumulated charging capacity and the accumulated discharging capacity are both preset capacity thresholds.

[0015] In the above scheme, when the cumulative charging capacity and the cumulative discharging capacity both reach the preset capacity threshold, the cumulative charging capacity and the cumulative discharging capacity are considered to be consistent, and there is no need to compare the cumulative charging capacity and the cumulative discharging capacity in real time, which can effectively save task resources and improve the monitoring efficiency of the energy efficiency of the battery to be tested.

[0016] In some embodiments, the preset capacity threshold comprises a preset multiple of the nominal capacity of the battery to be tested.

[0017] In the above solution, the preset capacity threshold is set to a preset multiple of the nominal capacity of the battery to be tested, and the preset capacity threshold is combined with the battery to be tested, which can effectively reduce the calculation error of the energy efficiency.

[0018] In some embodiments, the cumulative charge capacity includes the charge capacity of the battery under test in more than two charge and discharge cycles; and / or the cumulative discharge capacity includes the discharge capacity of the battery under test in more than two charge and discharge cycles.

[0019] The above scheme accumulates the charge capacity corresponding to more than two charge and discharge cycles of the battery to be tested to obtain the cumulative charge capacity; and / or accumulates the discharge capacity corresponding to more than two charge and discharge cycles of the battery to be tested to obtain the cumulative discharge capacity. To a certain extent, it can eliminate the impact of insufficient accuracy in operating parameter acquisition on the charge capacity and / or discharge capacity, and improve the calculation accuracy of energy efficiency.

[0020] In some embodiments, determining the energy efficiency of the battery to be tested based on the first start-stop time and the second start-stop time includes: determining the charging energy and the discharging energy of the battery to be tested based on the first start-stop time, the second start-stop time and the operating parameters; and comparing the discharging energy with the charging energy to determine the energy efficiency of the battery to be tested.

[0021] The above scheme, when calculating the energy efficiency of the battery to be tested, first combines the operating parameters, the first start-stop time, and the second start-stop time to calculate the charging energy and the discharging energy of the battery to be tested, and then uses the ratio of the discharging energy to the charging energy as the energy efficiency of the battery to be tested, which has the advantage of high calculation efficiency.

[0022] In some embodiments, determining the charging energy and discharging energy of the battery to be tested based on the first start-stop time, the second start-stop time and the operating parameters includes: performing energy calculation based on the first start-stop time and the operating parameters to determine the charging energy of the battery to be tested; and performing energy calculation based on the second start-stop time and the operating parameters to determine the discharging energy of the battery to be tested.

[0023] In the above scheme, when calculating the charging energy and the releasing energy, the charging energy is calculated by combining the first start and stop time and the operating parameters, and the releasing energy is calculated by combining the second start and stop time and the operating parameters, thereby ensuring the accuracy of the obtained charging energy and releasing energy and improving the energy efficiency accuracy.

[0024] In some embodiments, after determining the energy efficiency of the battery to be tested according to the first start-stop time and the second start-stop time, the method further includes: determining whether the battery to be tested meets a random inspection standard according to the energy efficiency.

[0025] After calculating the energy efficiency of the battery to be tested, the above scheme will further analyze whether the battery to be tested meets the random inspection standards based on the energy efficiency, realize the energy efficiency evaluation operation of the battery to be tested, ensure that the battery to be tested operates in a state that meets the random inspection standards, and improve operational reliability.

[0026] In some embodiments, determining whether the battery to be tested meets the sampling standard based on the energy efficiency includes: determining an energy efficiency threshold based on the operating parameters; checking whether the energy efficiency is greater than or equal to the energy efficiency threshold; if the energy efficiency is greater than or equal to the energy efficiency threshold, determining that the battery to be tested meets the sampling standard.

[0027] In the above solution, when analyzing whether the battery to be tested meets the random inspection standard, it is only necessary to compare the energy efficiency with the calculated preset energy efficiency threshold, which has high analysis efficiency.

[0028] In some embodiments, determining the energy efficiency threshold according to the operating parameters includes: determining the equivalent power of the battery to be tested according to the operating parameters; and determining the energy efficiency threshold according to the equivalent power.

[0029] The above scheme combines the calculated equivalent power of the battery to be tested to analyze the corresponding energy efficiency threshold, and associates whether the battery to be tested meets the sampling inspection standard with the equivalent power of the battery to be tested, thereby improving the analysis accuracy of whether the battery to be tested meets the sampling inspection standard.

[0030] In some embodiments, determining the energy efficiency threshold based on the equivalent power includes: determining a reference energy efficiency based on the equivalent power and a preset correspondence between operating power and energy efficiency; and determining an energy efficiency threshold based on the reference energy efficiency.

[0031] The above solution combines the preset correspondence between operating power and energy efficiency to analyze and obtain the corresponding energy efficiency threshold, thereby ensuring the accuracy of the energy efficiency threshold.

[0032] In some embodiments, determining the energy efficiency threshold according to the reference energy efficiency includes: determining the energy efficiency threshold according to the reference energy efficiency and a preset weight parameter.

[0033] The above scheme obtains the energy efficiency threshold value by analyzing the reference energy efficiency and the preset weight parameters. The analysis method is simple and can effectively improve the analysis efficiency of the energy efficiency threshold value.

[0034] In some embodiments, the method for determining the correspondence between the operating power and the energy efficiency includes: obtaining the experimental energy efficiency of a battery of the same type as the battery to be tested under different experimental operating powers; fitting according to the experimental operating power and the experimental energy efficiency to obtain the correspondence between the operating power and the energy efficiency and storing it.

[0035] The above scheme is based on the experimental energy efficiency of batteries of the same type as the battery to be tested under different experimental operating powers in the experimental scenario, and the corresponding relationship between operating power and energy efficiency is fitted and stored. In subsequent energy efficiency monitoring, it only needs to be directly called, which can effectively improve the efficiency of energy efficiency monitoring.

[0036] In some embodiments, after analyzing whether the battery to be tested meets the sampling inspection standard based on the energy efficiency, the method further includes: if the battery to be tested does not meet the sampling inspection standard, outputting an alarm prompt message; if the battery to be tested meets the sampling inspection standard, returning to the step of obtaining the operating parameters of the battery to be tested.

[0037] In the above scheme, when the battery to be tested does not meet the random inspection standards, an alarm prompt message is output. When the random inspection standards are met, the system returns to continue to obtain the operating parameters of the battery to be tested, thereby ensuring that when the battery to be tested does not meet the random inspection standards, the user can be reminded to perform maintenance actions in a timely manner, thereby improving the operating reliability of the battery to be tested.

[0038] In some embodiments, after obtaining the operating parameters of the battery to be tested, the method further includes: determining and storing the operating parameters of the battery to be tested based on the operating parameters.

[0039] In the above solution, after obtaining the operating parameters of the battery to be tested, the relevant operating parameters of the battery to be tested are obtained and stored in combination with the operating parameters, so as to subsequently optimize and control the operation of the battery to be tested in combination with the operating parameters of the battery to be tested.

[0040] In some embodiments, the operating condition parameters include at least one of energy storage operating condition parameters, charging stage operating condition parameters, and discharging stage operating condition parameters.

[0041] In the above solution, the operating condition parameters specifically include at least one of the energy storage operating condition parameters, the charging stage operating condition parameters and the discharging stage operating condition parameters, so as to subsequently realize the analysis of the energy storage working state, the discharging working state or the charging working state of the battery to be tested.

[0042] In a second aspect, the present application provides an energy efficiency monitoring device, comprising: a capacity analysis module, for obtaining a first start-stop time corresponding to the cumulative charging capacity and a second start-stop time corresponding to the cumulative discharge capacity when the cumulative charging capacity and the cumulative discharge capacity of the battery to be tested are consistent; an energy efficiency analysis module, for determining the energy efficiency of the battery to be tested based on the first start-stop time and the second start-stop time.

[0043] In a third aspect, the present application provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any of the above-mentioned energy efficiency monitoring methods when executing the computer program.

[0044] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of any of the above-mentioned energy efficiency monitoring methods are implemented.

[0045] In a fifth aspect, the present application provides a computer program product, including a computer program, characterized in that when the computer program is executed by a processor, the steps of any of the above-mentioned energy efficiency monitoring methods are implemented.

[0046] In a sixth aspect, the present application provides an energy efficiency monitoring method, comprising: displaying a display control corresponding to the energy efficiency of the battery to be tested on an energy efficiency display interface; displaying an energy efficiency curve of the battery to be tested in response to a triggering operation of the display control; the energy efficiency curve is a line connecting the energy efficiencies of the battery to be tested determined at different times; and displaying the operating parameters of the battery to be tested at the energy efficiency corresponding to the target time in the energy efficiency curve.

[0047] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0049] FIG1 is a schematic diagram of an application scenario of an energy efficiency monitoring method in some embodiments of the present application;

[0050] FIG2 is a flow chart of an energy efficiency monitoring method in some embodiments of the present application;

[0051] FIG3 is a flow chart of an energy efficiency monitoring method in some other embodiments of the present application;

[0052] FIG4 is a flow chart of an energy efficiency monitoring method in some other embodiments of the present application;

[0053] FIG5 is a schematic diagram of capacity change of a battery under test in some embodiments of the present application;

[0054] FIG6 is a flow chart of an energy efficiency monitoring method according to some other embodiments of the present application;

[0055] FIG7 is a flow chart of an energy efficiency monitoring method in some further embodiments of the present application;

[0056] FIG8 is a flow chart of an energy efficiency monitoring method in some other embodiments of the present application;

[0057] FIG9 is a flow chart of an energy efficiency monitoring method according to some other embodiments of the present application;

[0058] FIG10 is a flow chart of an energy efficiency monitoring method in some further embodiments of the present application;

[0059] FIG11 is a flow chart of an energy efficiency monitoring method according to some other embodiments of the present application;

[0060] FIG12 is a flow chart of an energy efficiency monitoring method in some other embodiments of the present application;

[0061] FIG13 is a flow chart of an energy efficiency monitoring method in some further embodiments of the present application;

[0062] FIG14 is a schematic diagram of a display interface of a backend server in some embodiments of the present application;

[0063] FIG15 is a schematic diagram of the structure of an energy efficiency monitoring device in some embodiments of the present application;

[0064] FIG16 is a schematic diagram of the structure of an energy efficiency monitoring device in other embodiments of the present application;

[0065] FIG17 is a schematic diagram of the internal structure of a computing device in some embodiments of the present application. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0068] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0069] 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 application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent 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.

[0070] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0071] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0072] At present, judging from the development of the market situation, energy storage power stations that use batteries as electrical energy storage devices are becoming more and more popular due to their high charge and discharge conversion efficiency, easy installation and maintenance, good environmental adaptability, wide operating temperature range and high safety performance.

[0073] The energy efficiency of a battery is an important indicator for measuring its performance. As an important component of an energy storage power station, the energy efficiency of a battery during its operation is also particularly important. The inventors of this application have noticed that the traditional energy efficiency calculation method generally calculates the battery energy efficiency based on the quantitative relationship between the open circuit voltage and the state of charge of the battery (or battery pack), and the curve of the average charging voltage and state of charge change of the battery. This method requires that the battery be charged and discharged under the same working conditions. In an energy storage power station, the battery pack needs to operate under peak-shaving and frequency-modulating switching conditions for a long time, and it is difficult to achieve a state where both charging and discharging are under the same working conditions. Obviously, the traditional energy efficiency calculation method is not suitable for energy storage power station application scenarios.

[0074] To adapt to the application scenarios of energy storage power stations, the inventors of this application discovered through research that, combined with the peak-shaving and frequency-regulating operating conditions of energy storage power stations, using time periods with the same charging and discharging capacities as the starting and ending points for energy efficiency calculations, abandoning the traditional single-charge and single-discharge method, and performing a single energy efficiency calculation, can overcome the restriction that charging and discharging must be performed under the same operating conditions. When calculating energy efficiency using this method, even if the charging and discharging conditions correspond to completely different operating conditions, the accuracy of the final calculated energy efficiency can be guaranteed to a certain extent.

[0075] Therefore, the technical solution of this application can obtain the cumulative time range corresponding to the cumulative charge capacity and the cumulative time range corresponding to the cumulative discharge capacity when the cumulative charge capacity and cumulative discharge capacity of the battery pack are consistent. Ultimately, the upper and lower limits of the two cumulative time ranges and the operating parameters are used for analysis and calculation to obtain the energy efficiency of the battery under test.

[0076] The energy efficiency monitoring method provided in the embodiment of the present application can be applied to the application environment shown in Figure 1. Among them, the energy storage power station 102 communicates with the background server 104 through wired or wireless communication. The data storage system can store the data that the background server 104 needs to process. The data storage system can be integrated on the background server 104, or it can be placed on the cloud or other network servers. Among them, the background server 104 can be implemented with an independent server or a server cluster composed of multiple servers. The specific type of the background server 104 is not unique. In a more detailed embodiment, the background server can also be implemented by a personal computer or a working machine.

[0077] The battery under test referred to in this application can be a single battery cell, or a battery pack formed by connecting multiple battery cells in series and / or in parallel, without specific limitation. When the energy efficiency monitoring method of this application is applied to the application environment of Figure 1, the corresponding battery under test refers to the battery pack installed in each energy storage cabinet in the energy storage power station 102.

[0078] To facilitate understanding of the technical solution of the present application, the following explanation is given by taking the application of the energy efficiency monitoring method to the background server 104 shown in FIG1 as an example.

[0079] Please refer to FIG. 2 . The present application provides an energy efficiency monitoring method, including step 202 and step 204 .

[0080] Step 202 : When the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, a first start-stop time corresponding to the cumulative charging capacity and a second start-stop time corresponding to the cumulative discharging capacity are obtained.

[0081] Specifically, the battery under test is a battery pack installed in different energy storage cabinets in an energy storage power station. The cumulative charge capacity is the cumulative amount of electricity charged into the battery under test when the battery under test is operating in a charging state within a certain time period. The cumulative discharge capacity is the cumulative amount of electricity discharged from the battery under test when the battery under test is operating in a discharging state within a certain time period. It should be noted that the cumulative charge capacity can be the amount of electricity charged into the battery under test during a single charge within a certain time period, or the sum of the amounts charged into the battery under test during multiple charge operations within a certain time period, and the battery under test can also perform a discharge operation in between multiple charge operations. Similarly, the cumulative discharge capacity can be the amount of electricity discharged from the battery under test during a single discharge within a certain time period, or the sum of the amounts discharged from the battery under test during multiple discharge operations within a certain time period, and the battery under test can also perform a charge operation in between multiple discharge operations.

[0082] The first start-stop time is the start and end time for counting the charge input of the battery under test, and the second start-stop time is the start and end time for counting the discharge output of the battery under test. According to the coulombic efficiency of a battery, the ratio of a battery's discharge capacity to its charge capacity during the same cycle can generally reach 99.9%, and lithium batteries can even reach 99.99%. Therefore, in the scheme of this embodiment, the state where the cumulative charge capacity and cumulative discharge capacity of the battery under test are equal is selected to equate the same cycle process of the battery under test. The first start-stop time and the second start-stop time corresponding to the same cumulative charge capacity and cumulative discharge capacity of the battery under test are selected to achieve energy efficiency calculation.

[0083] Step 204 : determining the energy efficiency of the battery to be tested according to the first start-stop time and the second start-stop time.

[0084] Specifically, energy efficiency is the percentage of discharged energy to charged energy during a battery's charge-discharge cycle under given conditions. After obtaining the first and second start-stop times, the backend server further analyzes and calculates the cumulative energy discharged by the battery under test during the second start-stop time relative to the cumulative energy charged to the battery during the first start-stop time. This percentage is used as the energy efficiency of the battery under test.

[0085] The above energy efficiency monitoring method can obtain the first start and stop time of the cumulative charging capacity and the second start and stop time of the cumulative discharge capacity when the cumulative charging capacity and cumulative discharge capacity of the battery under test are consistent, and use the first start and stop time and the second start and stop time to determine the energy efficiency of the battery under test. This solution calculates the energy efficiency of the battery under test based on the start and stop times of the cumulative charging capacity and the cumulative discharge capacity. It is not affected by the charging and discharging conditions during the actual operation of the battery under test. Even if the energy storage power station operates for a long time under peak and frequency switching conditions, it can still perform energy efficiency analysis of the battery under test, meeting the requirements of battery energy efficiency testing in energy storage power station application scenarios.

[0086] Referring to FIG. 3 , in some embodiments, step 202 includes step 302 and step 304 .

[0087] Step 302: Obtain operating parameters of the battery to be tested.

[0088] Step 304 , determining, based on the operating parameters, a first start / stop time corresponding to the cumulative charging capacity and a second start / stop time corresponding to the cumulative discharging capacity when the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent.

[0089] Specifically, the operating parameters are parameters that characterize the operating state of the battery under test during the charge and discharge process. When performing energy efficiency monitoring, the background server first obtains the operating parameters of the battery under test.

[0090] It is understandable that the specific types of operating parameters are not unique. In a more detailed embodiment, the operating parameters include at least one of charge and discharge current, charge and discharge voltage, battery temperature, SOC (State of Charge), and operating time.

[0091] It should be noted that the backend server is not the only way to obtain the operating parameters of the battery under test. In one embodiment, the backend server can directly communicate with the BMS (Battery Management System) of the battery under test to obtain the operating parameters of the battery under test from the BMS of the battery under test. In another embodiment, an intermediate controller can be set in the energy storage cabinet, and the BMS of the battery under test is in communication with the intermediate controller. During the operation of the battery under test, the real-time operating parameters of the battery under test can be sent to the intermediate controller. The intermediate controller further communicates with the backend server, and after receiving the operating parameters of the battery under test, it forwards them to the backend server, indicating that the backend server obtains the operating parameters of the battery under test.

[0092] After the backend server obtains the operating parameters of the battery to be tested, it uses them as the basis for analysis and calculation. During the charging and discharging processes of the battery to be tested, analysis and calculation are performed respectively. Finally, when the cumulative charging capacity and cumulative discharge capacity of the battery to be tested are consistent, the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharge capacity are obtained.

[0093] The above scheme, combined with the operating parameters of the battery under test during actual operation, determines the first start-stop time corresponding to the cumulative charging capacity and the second start-stop time corresponding to the cumulative discharge capacity when the cumulative charging capacity and the cumulative discharge capacity of the battery under test are consistent. The first start-stop time and the second start-stop time are associated with the actual operation of the battery under test to ensure the accuracy of energy efficiency monitoring.

[0094] Referring to FIG. 4 , in some embodiments, step 304 includes step 402 and step 404 .

[0095] In step 402, a capacity calculation is performed based on the operating parameters to determine the cumulative charge capacity and cumulative discharge capacity of the battery under test. In step 404, when the cumulative charge capacity and the cumulative discharge capacity are consistent, the start time and end time of the capacity calculation for the cumulative charge capacity are used as the first start-stop time, and the start time and end time of the capacity calculation for the cumulative discharge capacity are used as the second start-stop time.

[0096] Specifically, when the background server analyzes the first start and stop time and the second start and stop time, it first needs to calculate the cumulative charging capacity and the cumulative discharged capacity. When the cumulative charging capacity and the cumulative discharged capacity are the same, the start time and end time of the cumulative charging capacity calculation are selected as the first start and stop time; the start time and end time of the cumulative discharged capacity calculation are selected as the second start and stop time.

[0097] In a more detailed embodiment, as shown in conjunction with FIG5 , when the battery under test is operating, an arbitrary time point during the battery under test operation is first selected as the starting time for the cumulative charge capacity, namely, t1 in the figure. Starting from this time point, if the battery under test enters a charging condition, the charge capacity is calculated based on the obtained operating parameters. Finally, the charge capacities calculated for each stage (which may be only one stage, as shown in the figure, for multi-stage charging) are added together to obtain the cumulative charge capacity. Correspondingly, the time point at which the battery under test first enters a discharge condition after this time point, namely, t3 in the figure, is used as the starting time for the cumulative discharge capacity. After the cumulative discharge capacity starting time, the discharge capacity is calculated based on the obtained operating parameters. Finally, the discharge capacities calculated for each stage (which may be only one stage, as shown in the figure, for multi-stage discharge) are added together to obtain the cumulative discharge capacity. Finally, when the cumulative charging capacity is equal to the cumulative discharging capacity, that is, when Qc1+Qc2+Qc3=Qd1+Qd2+Qd3 in the figure, the cut-off time for charging capacity calculation, that is, t2 in the figure, is used as the end time corresponding to the cumulative charging capacity, and the cut-off time for discharging capacity calculation, that is, t4 in the figure, is used as the end time corresponding to the cumulative discharging capacity, so as to obtain the first start-stop time and the second start-stop time.

[0098] It is understandable that in another embodiment, any time point can be selected as the starting time of the cumulative discharged capacity. Starting from this time point, the time point corresponding to the first occurrence of the charging condition is used as the starting time of the cumulative charged capacity to realize the calculation of the first start-stop time and the second start-stop time. The specific details are similar to the above embodiment and will not be repeated here.

[0099] In the above scheme, when the calculated cumulative charging capacity and the cumulative discharging capacity are consistent, the start time and end time of the cumulative charging capacity calculation are used as the first start-stop time, and the start time and end time of the cumulative discharging capacity calculation are used as the second start-stop time, thereby ensuring the accuracy of the first start-stop time and the second start-stop time and improving the accuracy of the energy efficiency of the battery to be tested.

[0100] It should be pointed out that the calculation method of the cumulative charging capacity and the cumulative discharge capacity is not unique, and can be implemented specifically through integration or cumulative summation. The charging capacity is the product of the charging current and the charging time, and the discharge capacity is the product of the discharge current and the discharge time. In a more detailed embodiment, the cumulative charging capacity and the cumulative discharge capacity are solved by integration as an example for explanation, and the operating parameters of the battery to be tested include operating time, charging current and discharge current. After determining the starting time corresponding to the cumulative charging capacity of the battery to be tested, the background server calculates the cumulative charging capacity and the cumulative discharge capacity based on the charging current and discharge current obtained after this time point, as well as the corresponding operating time. In one embodiment, the background server can distinguish whether the obtained current value is a charging current or a discharge current based on the positive or negative sign of the obtained current value. When the obtained current is positive, it is used as the charging current for integral calculation to obtain the cumulative charging capacity; when the obtained current is negative, it is used as the discharge current for integral calculation to obtain the cumulative discharge capacity. The specific calculation formula is as follows:

[0101]

[0102]

[0103] Among them, Q chrg is the cumulative charging capacity, t1 and t2 are the starting time and ending time of the cumulative charging capacity calculation, that is, the first start and stop time, I chrg is the charging current; Q dischrg is the cumulative discharge capacity, t3 and t4 are the start time and end time of the cumulative discharge capacity calculation, that is, the second start and stop time, I dischrg is the discharge current.

[0104] In some embodiments, the accumulated charging capacity and the accumulated discharging capacity are consistent, including: the accumulated charging capacity and the accumulated discharging capacity are both preset capacity thresholds.

[0105] Specifically, the preset capacity threshold is the accumulated charge of the battery under a preset charging or discharging condition. When the backend server analyzes whether the cumulative charge capacity and the cumulative discharge capacity are consistent, it avoids comparing the calculated cumulative charge capacity and the cumulative discharge capacity in real time. Instead, the backend server stores a preset capacity threshold. During actual operation, the cumulative charge capacity and the cumulative discharge capacity are considered consistent only when both reach the preset capacity threshold.

[0106] In the above scheme, when the cumulative charging capacity and the cumulative discharging capacity both reach the preset capacity threshold, the cumulative charging capacity and the cumulative discharging capacity are considered to be consistent, and there is no need to compare the cumulative charging capacity and the cumulative discharging capacity in real time, which can effectively save task resources and improve the monitoring efficiency of the energy efficiency of the battery to be tested.

[0107] In some embodiments, the preset capacity threshold comprises a preset multiple of the nominal capacity of the battery to be tested.

[0108] Specifically, the nominal capacity of the battery under test is the nominal capacity of the battery under test. The nominal capacity refers to the minimum amount of charge that a battery should discharge under certain discharge conditions, as specified or guaranteed during battery design and manufacturing. Once the specific model of the battery under test is determined, the nominal capacity of the battery under test is also determined. During the actual analysis process, the corresponding first and second start-stop times can be determined by simply ensuring that the cumulative charge capacity of the battery under test reaches a preset multiple of the nominal capacity, and the cumulative discharge capacity of the battery under test reaches a preset multiple of the nominal capacity.

[0109] It should be noted that the preset multiple is not unique. In a more detailed embodiment, the preset multiple can be set to 20-100, taking into account the actual operating conditions of the battery under test, such as the SOC operating range, charge and discharge rate, voltage range, and number of full charge and discharge cycles, or the computing power of the backend server. In actual application scenarios, 20, 100, or any value between 20 and 100 can be selected based on actual needs. It is understood that in other embodiments, the preset multiple can be set to less than 20 or greater than 100, which can be determined based on the actual scenario.

[0110] In the above solution, the preset capacity threshold is set to a preset multiple of the nominal capacity of the battery to be tested, and the preset capacity threshold is combined with the battery to be tested, which can effectively reduce the calculation error of the energy efficiency.

[0111] In some embodiments, the accumulated charge capacity includes the charge capacity of the battery under test during more than two charge and discharge cycles; and / or the accumulated discharge capacity includes the discharge capacity of the battery under test during more than two charge and discharge cycles.

[0112] Specifically, the charge and discharge cycle is a cycle corresponding to a battery to be tested that continuously completes one charge and one discharge. In one embodiment, the cumulative charge capacity statistics may be the cumulative amount of electricity charged into the battery to be tested in more than two charge and discharge cycles, and the cumulative discharge capacity statistics may be the amount of electricity discharged by the battery to be tested in one charge and discharge cycle. In another embodiment, the cumulative discharge capacity statistics may be the cumulative amount of electricity discharged by the battery to be tested in more than two charge and discharge cycles, and the cumulative charge capacity statistics may be the amount of electricity charged into the battery to be tested in one charge and discharge cycle. In another embodiment, the cumulative charge capacity statistics may be the cumulative amount of electricity charged into the battery to be tested in more than two charge and discharge cycles, and the cumulative discharge capacity statistics may be the cumulative amount of electricity discharged by the battery to be tested in more than two charge and discharge cycles.

[0113] The above scheme accumulates the charge capacity corresponding to more than two charge and discharge cycles of the battery to be tested to obtain the cumulative charge capacity; and / or accumulates the discharge capacity corresponding to more than two charge and discharge cycles of the battery to be tested to obtain the cumulative discharge capacity. To a certain extent, it can eliminate the impact of insufficient accuracy in operating parameter acquisition on the charge capacity and / or discharge capacity, and improve the calculation accuracy of energy efficiency.

[0114] Please refer to FIG. 6 . In some embodiments, step 204 includes step 602 and step 604 .

[0115] Step 602 : Determine the charge energy and discharge energy of the battery to be tested according to the first start / stop time, the second start / stop time, and the operating parameters.

[0116] Step 604 : Compare the discharged energy with the charged energy to determine the energy efficiency of the battery under test.

[0117] Specifically, the charging energy is the cumulative energy charged into the battery under test when it is operating under charging conditions; the discharging energy is the cumulative energy discharged from the battery under test when it is operating under discharging conditions. After analyzing and obtaining the corresponding first start-stop time and second start-stop time when the cumulative charging capacity and cumulative discharging capacity of the battery under test are the same, the backend server will calculate the charging energy and discharging energy of the battery under test during this process in combination with the operating parameters. Finally, the discharged energy of the battery under test is compared with the charged energy to obtain the energy efficiency of the battery under test. The specific calculation method of energy efficiency is as follows:

[0118]

[0119] in, represents energy efficiency, E dischrg Indicates the release of energy, E chrg Indicates charging of energy.

[0120] The above scheme, when calculating the energy efficiency of the battery to be tested, first combines the operating parameters, the first start-stop time, and the second start-stop time to calculate the charging energy and the discharging energy of the battery to be tested, and then uses the ratio of the discharging energy to the charging energy as the energy efficiency of the battery to be tested, which has the advantage of high calculation efficiency.

[0121] Referring to FIG. 7 , in some embodiments, step 602 includes step 702 and step 704 .

[0122] Step 702 : performing energy calculation based on the first start / stop time and the operating parameters to determine the charging energy of the battery to be tested.

[0123] Step 704 : performing energy calculation based on the second start / stop time and the operating parameters to determine the released energy of the battery to be tested.

[0124] Specifically, in the solution of this embodiment, the operating parameters include the charging and discharging currents and charging and discharging voltages of the battery to be tested. The charged energy is specifically the product of the charging voltage, charging current and charging time when the battery to be tested is operating in a charging condition. The released energy is specifically the product of the discharge voltage, discharge current and discharge time when the battery to be tested is operating in a discharge condition.

[0125] It should be noted that the specific calculation method for charging energy and releasing energy is not unique and can be achieved through integration or cumulative summation. In order to facilitate understanding of the technical solution of this application, the following explanation is given using integral calculation as an example. In the solution of this embodiment, the start time and end time corresponding to the cumulative charging capacity are used as the start time and end time of the charging energy calculation, and the start time and end time corresponding to the cumulative releasing capacity are used as the start time and end time of the releasing energy calculation. The specific calculation method is as follows:

[0126]

[0127]

[0128] Among them, E chrg Indicates charging energy, E dischrg Indicates the released energy, t1 and t2 are the start time and end time of the cumulative charging capacity calculation, that is, the first start and stop time, t3 and t4 are the start time and end time of the cumulative discharge capacity calculation, that is, the second start and stop time, U c is the charging voltage, I chrg Indicates the charging current, U d Indicates the discharge voltage, I dischrg Indicates the discharge current. Correspondingly, the energy efficiency of the battery under test is

[0129] In the above scheme, when calculating the charging energy and the releasing energy, the charging energy is calculated by combining the first start and stop time and the operating parameters, and the releasing energy is calculated by combining the second start and stop time and the operating parameters, thereby ensuring the accuracy of the obtained charging energy and releasing energy and improving the energy efficiency accuracy.

[0130] Please refer to FIG. 8 . In some embodiments, after step 204 , the method further includes step 802 .

[0131] Step 802: Determine whether the battery to be tested meets the random inspection standard based on the energy efficiency.

[0132] Specifically, whether the battery to be tested meets the random inspection standard, that is, whether the battery to be tested operates with qualified energy efficiency. If the battery to be tested operates with qualified energy efficiency, it means that the battery to be tested meets the random inspection standard. If the battery to be tested does not operate with qualified energy efficiency, it means that the battery to be tested does not meet the random inspection standard.

[0133] After calculating the energy efficiency of the battery to be tested, the above scheme will further analyze whether the battery to be tested meets the random inspection standards based on the energy efficiency, realize the energy efficiency evaluation operation of the battery to be tested, ensure that the battery to be tested operates in a state that meets the random inspection standards, and improve operational reliability.

[0134] Referring to FIG. 9 , in some embodiments, step 802 includes step 902 and step 904 .

[0135] Step 902: Determine an energy efficiency threshold according to operating parameters.

[0136] Step 904: Check whether the energy efficiency is greater than or equal to the energy efficiency threshold.

[0137] Specifically, if the energy efficiency is greater than or equal to the energy efficiency threshold, it is determined that the battery under test meets the random inspection standard. Correspondingly, if the energy efficiency is less than the energy efficiency threshold, it is determined that the battery under test does not meet the random inspection standard.

[0138] The energy efficiency threshold is the minimum energy efficiency that the battery under test must meet for it to meet the inspection standards. After calculating the energy efficiency of the battery under test, the backend server further analyzes the operating parameters of the battery under test to determine the energy efficiency threshold that matches the current battery under test. Ultimately, this energy efficiency threshold is used to determine whether the battery under test meets the inspection standards, thereby evaluating the battery's operating status.

[0139] In the above solution, when analyzing whether the battery to be tested meets the random inspection standard, it is only necessary to compare the energy efficiency with the calculated preset energy efficiency threshold, which has high analysis efficiency.

[0140] Referring to FIG. 10 , in some embodiments, step 902 includes step 106 and step 108 .

[0141] Step 106: Determine the equivalent power of the battery to be tested according to the operating parameters.

[0142] Step 108: Determine an energy efficiency threshold according to the equivalent power.

[0143] Specifically, equivalent power is the equivalent power obtained by the battery under test under its current operating conditions. The equivalent power can be the equivalent input power of the battery under test under charging conditions. Correspondingly, the equivalent power is the product of the equivalent charging voltage and the equivalent charging current of the battery under test. The equivalent power can also be the equivalent output power of the battery under test under discharging conditions. Correspondingly, the equivalent power is the product of the equivalent discharge voltage and the equivalent discharge current of the battery under test.

[0144] The equivalent charging voltage is the equivalent voltage charged during the charging process when a battery pack composed of multiple battery cells is equivalent to a single battery; the equivalent charging current is the equivalent current charged during the charging process when a battery pack composed of multiple battery cells is equivalent to a single battery. The equivalent discharge voltage is the equivalent voltage discharged during the discharge process when a battery pack composed of multiple battery cells is equivalent to a single battery; the equivalent discharge current is the equivalent current discharged during the discharge process when a battery pack composed of multiple battery cells is equivalent to a single battery. In actual operation, a BMS can be set up for each battery cell, and the charge and discharge voltage and charge and discharge current of each battery are collected separately by each BMS, and these are sent to the background server as the operating parameters of the battery to be tested. At the background server, the received operating parameters and the series and parallel connection of the battery pack are combined to analyze the equivalent (charging or discharging) voltage and equivalent (charging or discharging) current, and then further calculations are performed to obtain the equivalent power. Finally, the backend server conducts further analysis based on the equivalent power to obtain the energy efficiency threshold corresponding to the battery to be tested, thereby analyzing whether it meets the sampling inspection standards.

[0145] In another embodiment, a BMS can be installed on each battery pack. The BMS directly collects the equivalent (charging or discharging) voltage and equivalent (charging or discharging) current of the battery under test, and then sends these as the operating parameters of the battery under test to the backend server. Finally, the backend server further analyzes the equivalent power to obtain the energy efficiency threshold corresponding to the battery under test, thereby determining whether it meets the sampling inspection standards. The specific method used should be determined according to actual needs.

[0146] The above scheme combines the calculated equivalent power of the battery to be tested to analyze the corresponding energy efficiency threshold, and associates whether the battery to be tested meets the sampling inspection standard with the equivalent power of the battery to be tested, thereby improving the analysis accuracy of whether the battery to be tested meets the sampling inspection standard.

[0147] Referring to FIG. 11 , in some embodiments, step 108 includes step 112 and step 114 .

[0148] Step 112: Determine the reference energy efficiency according to the equivalent power and the preset corresponding relationship between the operating power and the energy efficiency.

[0149] Step 114: Determine an energy efficiency threshold value based on the reference energy efficiency.

[0150] Specifically, the reference energy efficiency is the theoretically achievable energy efficiency at the current equivalent power of the battery under test. The backend server pre-stores the corresponding relationship between operating power and energy efficiency. After obtaining the equivalent power of the battery under test, simply substitute the equivalent power into the corresponding relationship between operating power and energy efficiency to directly obtain the reference energy efficiency. Taking into account detection errors and the actual operating scenario of the battery under test, the server further analyzes the reference energy efficiency to ultimately determine the appropriate energy efficiency threshold.

[0151] The above solution combines the preset correspondence between operating power and energy efficiency to analyze and obtain the corresponding energy efficiency threshold, thereby ensuring the accuracy of the energy efficiency threshold.

[0152] Referring to FIG. 12 , in some embodiments, step 114 includes step 122 .

[0153] Step 122: Determine an energy efficiency threshold according to the reference energy efficiency and a preset weight parameter.

[0154] Specifically, the preset weight parameter is a preset ratio parameter of the energy efficiency threshold to the reference energy efficiency. After calculating the reference energy efficiency, the backend server will further solve it based on the preset weight parameter and use the product of the reference energy efficiency and the preset weight parameter as the energy efficiency threshold.

[0155] It should be noted that the preset weight parameter is not unique. In a more detailed embodiment, the preset weight parameter can be set to 0.5-1. In actual monitoring, 0.5, 1, or any value between 0.5-1 can be selected as the weight parameter, and the product of the weight parameter and the reference energy efficiency is used as the energy efficiency threshold. It is understood that in other embodiments, the weight parameter can also be set to a value less than 0.5 or greater than 1, and the specific selection can be based on actual needs.

[0156] The above scheme obtains the energy efficiency threshold value by analyzing the reference energy efficiency and the preset weight parameters. The analysis method is simple and can effectively improve the analysis efficiency of the energy efficiency threshold value.

[0157] In some embodiments, the method for determining the correspondence between operating power and energy efficiency includes: obtaining the experimental energy efficiency of a battery of the same type as the battery to be tested under different experimental operating powers; fitting according to the experimental operating power and the experimental energy efficiency to obtain the correspondence between operating power and energy efficiency and storing it.

[0158] Specifically, the experimental operating power is the equivalent power of a battery of the same type as the battery to be tested under the experimental operating conditions; the experimental energy efficiency is the energy efficiency obtained by calculating the same type of battery as the battery to be tested under different experimental operating powers. The correspondence between operating power and energy efficiency can be stored in the background server in the form of charts, databases, etc. Correspondingly, the way of fitting the experimental operating power and experimental energy efficiency is not unique. In one embodiment, a large number of experimental operating powers and experimental energy efficiencies can be obtained for curve fitting to obtain a relationship curve between operating power and energy efficiency. In another embodiment, more than two experimental operating powers and experimental energy efficiencies can be selected for polynomial fitting to obtain and store the relationship between operating power and energy efficiency.

[0159] It is understood that the correspondence between operating power and energy efficiency can be determined in a backend server. The backend server receives data from batteries of the same type as the battery under test in an experimental environment at different experimental operating powers and the corresponding energy efficiencies at each experimental operating power. The backend server then performs fitting to obtain and store the correspondence between operating power and energy efficiency. In another embodiment, the correspondence between operating power and energy efficiency can also be obtained by fitting on another processor or controller and ultimately sent to the backend server.

[0160] In a more detailed embodiment, taking the corresponding relationship between operating power and energy efficiency obtained by polynomial fitting as an example, it is first necessary to obtain the energy efficiencies x1, x2, x3, and x4 of the same type of battery as the battery to be tested at 0.25P0 (0.25 times the rated power), 0.5P0, 1P0, and 2P0 operating states. Then, polynomial fitting is performed to obtain y=k0+k1*P+k2*P 2 +k3*P 3 , where y represents energy efficiency and P represents operating power. In the subsequent calculation of the energy efficiency threshold, simply substitute the calculated equivalent power to obtain the corresponding reference energy efficiency.

[0161] The above scheme is based on the experimental energy efficiency of batteries of the same type as the battery to be tested under different experimental operating powers in the experimental scenario, and the corresponding relationship between operating power and energy efficiency is fitted and stored. In subsequent energy efficiency monitoring, it only needs to be directly called, which can effectively improve the efficiency of energy efficiency monitoring.

[0162] Please refer to FIG. 13 . In some embodiments, after step 802 , the method further includes step 132 .

[0163] Step 132: If the battery to be tested does not meet the sampling inspection standard, an alarm prompt message is output.

[0164] If the battery to be tested meets the sampling inspection standard, the process returns to the step of obtaining the operating parameters of the battery to be tested.

[0165] Specifically, when the background server detects that the battery to be tested does not meet the sampling inspection standards, it will output an alarm prompt message to inform the staff of this status. If the battery to be tested meets the sampling inspection standards, there is no need for an alarm prompt, and it only needs to return to the next round of energy efficiency monitoring operations.

[0166] It is understood that in one embodiment, the backend server simultaneously monitors the batteries to be tested in multiple energy storage cabinets in the energy storage power station. When the analysis shows that there are batteries to be tested that do not meet the random inspection standards, an alarm prompt message will be output to the corresponding energy storage cabinet so that the staff can promptly know which energy storage cabinet's battery pack does not meet the random inspection standards.

[0167] It should be noted that the backend server's method for outputting alarm information is not unique. In one embodiment, the energy storage power station may be equipped with a terminal device that communicates with the backend server. When the backend server analyzes that a battery under test does not meet the sampling inspection criteria, it outputs the corresponding energy storage cabinet number to the terminal device and simultaneously outputs an alarm prompt information to the terminal device, thereby controlling the terminal device to output an alarm signal to personnel. In another embodiment, the energy storage power station may be directly equipped with an alarm device. When a battery under test does not meet the sampling inspection criteria, the alarm prompt information is directly output to the alarm device, which in turn controls the alarm device to issue an alarm signal to alert personnel.

[0168] In the above scheme, when the battery to be tested does not meet the random inspection standards, an alarm prompt message is output. When the random inspection standards are met, the system returns to continue to obtain the operating parameters of the battery to be tested, thereby ensuring that when the battery to be tested does not meet the random inspection standards, the user can be reminded to perform maintenance actions in a timely manner, thereby improving the operating reliability of the battery to be tested.

[0169] In some embodiments, after obtaining the operating parameters of the battery to be tested, the method further includes: analyzing the operating parameters to obtain and store the operating parameters of the battery to be tested.

[0170] Specifically, operating condition parameters are parameters that characterize the actual operating condition of the battery under test. These parameters are not unique and can be operating parameters, such as charge and discharge voltages and currents, or parameters derived from statistical analysis of operating parameters, such as the number of charges and discharges. After obtaining the operating parameters of the battery under test, the backend server not only analyzes the energy efficiency of the battery under test based on the operating parameters, but also conducts further analysis based on the operating parameters to obtain and store the operating condition parameters of the battery under test.

[0171] Furthermore, in one embodiment, the background server has a display function. When the background server receives the operating parameters for analysis and obtains the operating parameters of the battery to be tested, it will further display the operating parameters on the display interface so that the staff can intuitively obtain the operating status of the battery to be tested.

[0172] In the above solution, after obtaining the operating parameters of the battery to be tested, the relevant operating parameters of the battery to be tested are obtained and stored in combination with the operating parameters, so as to subsequently optimize and control the operation of the battery to be tested in combination with the operating parameters of the battery to be tested.

[0173] In some embodiments, the operating condition parameters include at least one of energy storage operating condition parameters, charging stage operating condition parameters, and discharging stage operating condition parameters.

[0174] Specifically, the specific types of operating parameters are not unique. Combined with the actual usage scenarios of the battery to be tested, the operating parameters can be one or a combination of any two of the energy storage operating parameters, charging stage operating parameters and discharging stage operating parameters. It can also include energy storage operating parameters, charging stage operating parameters and discharging stage operating parameters at the same time.

[0175] Furthermore, in a more detailed embodiment, the energy storage operating condition parameters include at least one of the start operation time, end operation time, equivalent charge and discharge cycle, energy efficiency, health state, number of full charge and discharge cycles, rest time, total charge capacity, total discharge capacity, total charge time, total discharge time, total charge energy, total discharge energy, total charge times, and total discharge times of the battery to be tested. In a more detailed embodiment, the energy storage operating condition parameters also include the start operation time, end operation time, equivalent charge and discharge cycle, energy efficiency, health state, number of full charge and discharge cycles, rest time, total charge capacity, total discharge capacity, total charge time, total discharge time, total charge energy, total discharge energy, total charge times, and total discharge times.

[0176] In a more detailed embodiment, the operating parameters of the charging stage include at least one of the equivalent charging current, equivalent charging voltage, equivalent temperature, charging current distribution, state of charge distribution, and voltage parameters. The charging current distribution specifically includes the time when the battery to be tested is charged at different charging current rates, and the proportion of the total charging time. For example, it can be the proportion of charging current less than 0.5C, the proportion of charging current greater than or equal to 0.5C and less than or equal to 1C, and the proportion of charging current greater than 1C. The state of charge distribution is the proportion of different state of charge parameters in the total charging time during the charging process of the battery to be tested, for example, the proportion of SOC less than 30%, the proportion of SOC greater than or equal to 30% and less than or equal to 70%, and the proportion of SOC greater than 70%. The voltage parameter may include at least one of the voltage extreme value and the voltage difference extreme value.

[0177] In a more detailed embodiment, the discharge stage operating condition parameters include at least one of the equivalent discharge current, equivalent discharge voltage, equivalent temperature, discharge current distribution, state of charge distribution, and voltage parameters. The discharge current distribution specifically includes the time when the battery to be tested is discharged at different discharge current rates, and the proportion of the total discharge time. For example, it can be the proportion of discharge current less than 0.5C, the proportion of discharge current greater than or equal to 0.5C and less than or equal to 1C, and the proportion of discharge current greater than 1C. The state of charge distribution is the proportion of different state of charge parameters in the total discharge time during the discharge process of the battery to be tested, for example, the proportion of SOC less than 30%, the proportion of SOC greater than or equal to 30% and less than or equal to 70%, and the proportion of SOC greater than 70%. The voltage parameter may include at least one of the voltage extreme value and the voltage difference extreme value.

[0178] Please refer to Figure 14. In a more detailed embodiment, after the backend server obtains the operating parameters of the battery under test, it will record and display them on the display interface, sequentially displaying the energy efficiency of the battery packs of different energy storage cabinets in the energy storage power station. At the same time, for any energy storage cabinet, the display interface can also display the historical energy efficiency curve (Figure A), the current energy efficiency discharge condition and the current distribution diagram during the charge and discharge condition (Figure B), and output an alarm signal if at least one energy storage cabinet does not meet the sampling inspection standards (Figure C).

[0179] In the above solution, the operating condition parameters specifically include at least one of the energy storage operating condition parameters, the charging stage operating condition parameters and the discharging stage operating condition parameters, so as to subsequently realize the analysis of the energy storage working state, the discharging working state or the charging working state of the battery to be tested.

[0180] In some embodiments, the present application provides an energy efficiency monitoring method, including: displaying a display control corresponding to the energy efficiency of the battery to be tested on an energy efficiency display interface; displaying an energy efficiency curve of the battery to be tested in response to a triggering operation of the display control; the energy efficiency curve is a line connecting the energy efficiencies of the battery to be tested determined at different times; and displaying the operating parameters of the battery to be tested at the energy efficiency corresponding to the target time in the energy efficiency curve.

[0181] Specifically, referring to Figure 14 , the energy efficiency display interface is used to display the energy efficiency of the battery under test. In this embodiment, energy efficiency is determined based on the energy efficiency monitoring methods described in the aforementioned embodiments. This includes obtaining a first start / stop time corresponding to the cumulative charge capacity and a second start / stop time corresponding to the cumulative discharge capacity when the cumulative charge capacity and discharge capacity of the battery under test are consistent. The energy efficiency of the battery under test is determined based on the first start / stop time and the second start / stop time. A display control is a user interface control used to display the energy efficiency of the battery under test. A control encapsulates data and methods.

[0182] The solution of this embodiment, based on the aforementioned energy efficiency monitoring method, can determine the energy efficiency of battery packs in different energy storage cabinets, as well as relevant operating condition parameters during the energy efficiency determination process. These parameters are then collected and packaged in different display controls, such as the energy efficiency of energy storage cabinet 1, energy storage cabinet 2, and so on, as shown in Figure 14. The operating condition parameters are specifically as described in the aforementioned embodiment, including the current distribution diagram during the charge and discharge operating condition shown in Figure B, as well as at least one of the energy storage operating condition parameters, charging phase operating condition parameters, and discharging phase operating condition parameters recorded in the illustrated operating condition parameter record table. The details are not further described here.

[0183] When a user needs to view the energy efficiency of a specific energy storage cabinet, they simply trigger the display control corresponding to that cabinet. The display control will then display the energy efficiency curve corresponding to that cabinet, i.e., the energy efficiency change curves acquired during historical monitoring. It is understood that during this process, the display control may only display the energy efficiency curve for the corresponding energy storage cabinet after responding to the triggering operation. If the user needs to further view the operating parameters corresponding to a specific energy efficiency, they simply touch the corresponding energy efficiency on the energy efficiency curve to display the corresponding operating parameters on the energy efficiency display interface.

[0184] In another embodiment, the display control may be such that after responding to a trigger operation, the energy efficiency curve of the corresponding energy storage cabinet is displayed, and the operating condition parameters corresponding to one of the energy efficiencies (which may be the most recently measured) are simultaneously displayed on the energy efficiency display interface. When the user needs to view the operating condition parameters of other energy efficiencies, he or she only needs to touch the corresponding energy efficiency on the energy efficiency curve to display the operating condition parameters corresponding to the energy efficiency on the energy efficiency display interface.

[0185] To facilitate understanding of the technical solution of the present application, the present application is explained below in conjunction with a more detailed embodiment. The batteries to be tested are specifically battery packs installed in different energy storage cabinets in an energy storage power station. During actual operation, the BMS of the battery pack in the energy storage cabinet can obtain the operating time of the battery pack in real time, as well as the equivalent charge and discharge voltage and equivalent charge and discharge current at each operating time point, and send these as operating parameters to the background server.

[0186] The backend server receives the operating parameters collected and sent by the BMS in real time, selects any operating time as the starting time point for charging capacity or discharging capacity calculation, and if the current value obtained after the starting time point is positive, it is used as the equivalent charging current, and the cumulative charging capacity is calculated based on the equivalent charging current and the corresponding operating time; if the current value obtained is negative, it is used as the equivalent discharge current and combined with the corresponding operating time to calculate the cumulative discharging capacity. The specific calculation method is: Among them, t1 and t2 are the starting time and ending time of the cumulative charging capacity calculation, that is, the first start and stop time, I chrg is the equivalent charging current; Q dischrg is the cumulative discharge capacity, t3 and t4 are the start time and end time of the cumulative discharge capacity calculation, that is, the second start and stop time, I dischrg is the equivalent discharge current.

[0187] In the calculation of Q chrg =Q dischrg , and both are preset multiples of the nominal capacity, record the corresponding first start-stop time and second start-stop time, i.e. t1, t2, t3 and t4. Then, combine the equivalent charging voltage obtained during the t1-t2 operating period to calculate the charged energy, and combine the equivalent discharge voltage during the t3-t4 operating period to calculate the discharged energy. The specific calculation method is: Among them, E chrg Indicates charging energy, E dischrg Indicates the release of energy, U c is the equivalent charging voltage, U d Indicates the equivalent discharge voltage. Calculate the energy efficiency of the battery under test

[0188] Afterwards, the backend server calculates the equivalent power of the battery under test based on the operating parameters of the t1-t2 operating period or the t3-t4 operating period. Combined with the corresponding relationship between operating power and energy efficiency pre-stored in the backend server, y = k0 + k1*P + k2*P 2 +k3*P 3 , calculates the reference energy efficiency corresponding to the current battery under test, and further calculates based on the preset weight parameters to ultimately obtain the energy efficiency threshold. The backend server will compare and analyze the monitored energy efficiency with the calculated energy efficiency threshold. If the energy efficiency is less than the energy efficiency threshold, the battery under test is considered to meet the sampling inspection standard, and an alarm prompt message will be output to inform the user. If the energy efficiency is greater than the energy efficiency threshold, the battery under test is considered to meet the sampling inspection standard, and the system will return to re-acquire operating parameters for the next round of monitoring operations.

[0189] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0190] Based on the same inventive concept, embodiments of the present application also provide an energy efficiency monitoring device for implementing the aforementioned energy efficiency monitoring method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations in one or more of the energy efficiency monitoring device embodiments provided below can be found in the above-described limitations on the energy efficiency monitoring method and are not further elaborated here.

[0191] In some embodiments, referring to FIG. 15 , the energy efficiency monitoring device includes a capacity analysis module 152 and an energy efficiency analysis module 154 .

[0192] The capacity analysis module 152 is used to obtain the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharging capacity of the battery under test when the cumulative charging capacity and the cumulative discharging capacity of the battery under test are consistent; the energy efficiency analysis module 154 is used to determine the energy efficiency of the battery under test based on the first start and stop time and the second start and stop time.

[0193] In some embodiments, the capacity analysis module 152 is further used to obtain operating parameters of the battery to be tested; based on the operating parameters, when the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are determined to be consistent, the first start and stop time corresponding to the cumulative charging capacity, and the second start and stop time corresponding to the cumulative discharging capacity.

[0194] In some embodiments, the capacity analysis module 152 is also used to perform capacity calculations based on operating parameters to determine the cumulative charging capacity and cumulative discharging capacity of the battery to be tested; when the cumulative charging capacity and the cumulative discharging capacity are consistent, the start time and end time of the capacity calculation of the cumulative charging capacity are used as the first start and stop time, and the start time and end time of the capacity calculation of the cumulative discharging capacity are used as the second start and stop time.

[0195] In some embodiments, the cumulative charging capacity and the cumulative discharging capacity are both preset capacity thresholds.

[0196] In some embodiments, the preset capacity threshold comprises a preset multiple of the nominal capacity of the battery to be tested.

[0197] In some embodiments, the accumulated charge capacity includes the charge capacity of the battery under test during more than two charge and discharge cycles; and / or the accumulated discharge capacity includes the discharge capacity of the battery under test during more than two charge and discharge cycles.

[0198] In some embodiments, the energy efficiency analysis module 154 is further used to determine the charging energy and discharging energy of the battery under test based on the first start-stop time, the second start-stop time and the operating parameters; and compare the discharging energy with the charging energy to determine the energy efficiency of the battery under test.

[0199] In some embodiments, the energy efficiency analysis module 154 is further configured to perform energy calculations based on the first start / stop time and operating parameters to determine the charge energy of the battery under test; and perform energy calculations based on the second start / stop time and operating parameters to determine the discharge energy of the battery under test.

[0200] Please refer to FIG. 16 . In some embodiments, after the energy efficiency analysis module 154 , the apparatus further includes a sampling analysis module 162 .

[0201] The sampling inspection analysis module 162 is used to determine whether the battery to be tested meets the sampling inspection standard based on the energy efficiency.

[0202] In some embodiments, the sampling analysis module 162 is also used to determine an energy efficiency threshold based on operating parameters; verify whether the energy efficiency is greater than or equal to the energy efficiency threshold; if the energy efficiency is greater than or equal to the energy efficiency threshold, determine that the battery to be tested meets the sampling standard.

[0203] In some embodiments, the sampling and analysis module 162 is further configured to determine the equivalent power of the battery to be tested according to the operating parameters; and determine the energy efficiency threshold according to the equivalent power.

[0204] In some embodiments, the sampling analysis module 162 is further configured to determine a reference energy efficiency based on the equivalent power and the corresponding relationship between the preset operating power and energy efficiency; and to determine an energy efficiency threshold based on the reference energy efficiency.

[0205] In some embodiments, the sampling analysis module 162 is further configured to determine an energy efficiency threshold based on a reference energy efficiency and a preset weight parameter.

[0206] In some embodiments, the sampling analysis module 162 is further configured to output an alarm message if the battery to be tested does not meet the sampling inspection standard; if the battery to be tested meets the sampling inspection standard, control the capacity analysis module 152 to execute an operation to obtain the operating parameters of the battery to be tested.

[0207] Each module in the energy efficiency monitoring device described above may be implemented in whole or in part through software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0208] The above-mentioned energy efficiency monitoring device can obtain the first start and stop time of the cumulative charging capacity and the second start and stop time of the cumulative discharge capacity when the cumulative charging capacity and cumulative discharge capacity of the battery under test are consistent, and use the first start and stop time and the second start and stop time to determine the energy efficiency of the battery under test. This solution calculates the energy efficiency of the battery under test based on the start and stop times of the cumulative charging capacity and the cumulative discharge capacity, and is unaffected by the charging and discharging conditions during the actual operation of the battery under test. Even if the energy storage power station operates for a long time under peak and frequency switching conditions, it can still perform energy efficiency analysis of the battery under test, meeting the requirements of battery energy efficiency testing in energy storage power station application scenarios.

[0209] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG17 . The computer device includes a processor, memory, a communication interface, a display screen, and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal via wired or wireless communication. The wireless communication may be achieved via Wi-Fi, a mobile cellular network, NFC (near-field communication), or other technologies. When executed by the processor, the computer program implements an energy efficiency monitoring method. The display screen of the computer device may be a liquid crystal display or an electronic ink display screen. The input device of the computer device may be a touch layer covering the display screen, or may be buttons, a trackball, or a touchpad provided on the computer device housing, or may be an external keyboard, touchpad, or mouse.

[0210] Those skilled in the art will understand that the structure shown in Figure 17 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0211] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0212] When the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, a first start-stop time corresponding to the cumulative charging capacity and a second start-stop time corresponding to the cumulative discharging capacity are obtained; and the energy efficiency of the battery to be tested is determined based on the first start-stop time and the second start-stop time.

[0213] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0214] When the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, a first start-stop time corresponding to the cumulative charging capacity and a second start-stop time corresponding to the cumulative discharging capacity are obtained; and the energy efficiency of the battery to be tested is determined based on the first start-stop time and the second start-stop time.

[0215] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0216] When the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, a first start-stop time corresponding to the cumulative charging capacity and a second start-stop time corresponding to the cumulative discharging capacity are obtained; and the energy efficiency of the battery to be tested is determined based on the first start-stop time and the second start-stop time.

[0217] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0218] The aforementioned computer device, storage medium, and computer program product can obtain the first start and stop time of the cumulative charge capacity and the second start and stop time of the cumulative discharge capacity when the cumulative charge capacity and cumulative discharge capacity of the battery under test are consistent, and determine the energy efficiency of the battery under test based on the first start and stop time and the second start and stop time. This solution calculates the energy efficiency of the battery under test based on the start and stop times of the cumulative charge capacity and the cumulative discharge capacity, and is unaffected by the charging and discharging conditions during the actual operation of the battery under test. Even if the energy storage power station operates for a long time under peak and frequency switching conditions, it can still perform energy efficiency analysis of the battery under test, thus meeting the requirements of battery energy efficiency testing in energy storage power station application scenarios.

[0219] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for monitoring energy efficiency, characterized in that: include: When the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharging capacity are obtained; The energy efficiency of the battery to be tested is determined according to the first start-stop time and the second start-stop time.

2. The energy efficiency monitoring method according to claim 1, characterized in that: When the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are obtained to be consistent, the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharging capacity include: Obtain the operating parameters of the battery under test; According to the operating parameters, when the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are determined to be consistent, a first start-stop time corresponding to the cumulative charging capacity and a second start-stop time corresponding to the cumulative discharging capacity are determined.

3. The energy efficiency monitoring method according to claim 2, characterized in that: When it is determined according to the operating parameters that the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, the first start and stop time corresponding to the cumulative charging capacity and the second start and stop time corresponding to the cumulative discharging capacity include: Performing capacity calculation based on the operating parameters to determine the cumulative charging capacity and cumulative discharging capacity of the battery to be tested; When the cumulative charging capacity is consistent with the cumulative discharging capacity, the start time and end time of the capacity calculation of the cumulative charging capacity are used as the first start and stop time, and the start time and end time of the capacity calculation of the cumulative discharging capacity are used as the second start and stop time.

4. The energy efficiency monitoring method according to any one of claims 1 to 3, characterized in that: The cumulative charging capacity and the cumulative discharging capacity are consistent, including: the cumulative charging capacity and the cumulative discharging capacity are both preset capacity thresholds.

5. The energy efficiency monitoring method according to claim 4, characterized in that: The preset capacity threshold includes a preset multiple of the nominal capacity of the battery to be tested.

6. The energy efficiency monitoring method according to any one of claims 1 to 3, characterized in that: The cumulative charging capacity includes the charging capacity of the battery to be tested in more than two charge and discharge cycles; And / or, the accumulated discharge capacity includes the discharge capacity of the battery to be tested in more than two charge and discharge cycles.

7. The energy efficiency monitoring method according to claim 2 or 3, characterized in that: The determining the energy efficiency of the battery to be tested according to the first start-stop time and the second start-stop time includes: determining a charge energy and a discharge energy of the battery to be tested according to the first start / stop time, the second start / stop time, and the operating parameters; The discharged energy is compared with the charged energy to determine the energy efficiency of the battery under test.

8. The energy efficiency monitoring method according to claim 7, characterized in that: The determining, according to the first start / stop time, the second start / stop time, and the operating parameters, the charging energy and the discharging energy of the battery to be tested includes: Performing energy calculation according to the first start-stop time and the operating parameters to determine the charging energy of the battery to be tested; Energy calculation is performed according to the second start-stop time and the operating parameters to determine the discharged energy of the battery to be tested.

9. The energy efficiency monitoring method according to claim 2 or 3, characterized in that: After determining the energy efficiency of the battery to be tested according to the first start-stop time and the second start-stop time, the method further includes: Determine whether the battery to be tested meets a random inspection standard according to the energy efficiency.

10. The energy efficiency monitoring method according to claim 9, characterized in that: Determining whether the battery to be tested meets a random inspection standard according to the energy efficiency includes: determining an energy efficiency threshold based on the operating parameters; Check whether the energy efficiency is greater than or equal to the energy efficiency threshold; if the energy efficiency is greater than or equal to the energy efficiency threshold, determine that the battery to be tested meets the random inspection standard.

11. The energy efficiency monitoring method according to claim 10, characterized in that: The determining of the energy efficiency threshold according to the operating parameter includes: Determining the equivalent power of the battery to be tested according to the operating parameters; An energy efficiency threshold is determined according to the equivalent power.

12. The energy efficiency monitoring method according to claim 11, characterized in that: The determining of the energy efficiency threshold according to the equivalent power includes: Determining a reference energy efficiency based on the equivalent power and a preset correspondence between the operating power and the energy efficiency; An energy efficiency threshold is determined according to the reference energy efficiency.

13. The energy efficiency monitoring method according to claim 12, characterized in that: The step of determining the energy efficiency threshold according to the referenced energy efficiency includes: An energy efficiency threshold is determined according to the reference energy efficiency and a preset weight parameter.

14. The energy efficiency monitoring method according to claim 12, characterized in that: The method for determining the corresponding relationship between the operating power and the energy efficiency includes: Obtaining experimental energy efficiency of batteries of the same type as the battery to be tested under different experimental operating powers; Fitting is performed according to the experimental operating power and the experimental energy efficiency to obtain and store a corresponding relationship between the operating power and the energy efficiency.

15. The energy efficiency monitoring method according to claim 9, characterized in that: After analyzing whether the battery to be tested meets the random inspection standard according to the energy efficiency, the method further includes: If the battery under test does not meet the sampling inspection standard, an alarm prompt message is output; If the battery to be tested meets the random inspection standard, the process returns to the step of obtaining the operating parameters of the battery to be tested.

16. The energy efficiency monitoring method according to claim 2 or 3, characterized in that: After obtaining the operating parameters of the battery to be tested, the method further includes: According to the operating parameters, the operating parameters of the battery to be tested are determined and stored.

17. The energy efficiency monitoring method according to claim 16, characterized in that: The operating condition parameters include at least one of energy storage operating condition parameters, charging stage operating condition parameters and discharging stage operating condition parameters.

18. An energy efficiency monitoring device, characterized in that: include: a capacity analysis module, configured to obtain, when the cumulative charging capacity and the cumulative discharging capacity of the battery to be tested are consistent, a first start-stop time corresponding to the cumulative charging capacity, and a second start-stop time corresponding to the cumulative discharging capacity; An energy efficiency analysis module is configured to determine the energy efficiency of the battery to be tested according to the first start-stop time and the second start-stop time.

19. An energy efficiency monitoring method, characterized in that: include: On the energy efficiency display interface, display controls corresponding to the energy efficiency of the battery to be tested are displayed; In response to a triggering operation of the display control, an energy efficiency curve of the battery to be tested is displayed; the energy efficiency curve is a line connecting the energy efficiencies of the battery to be tested determined at different times; The operating parameters of the battery to be tested at the energy efficiency corresponding to the target time in the energy efficiency curve are displayed.

20. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the energy efficiency monitoring method according to any one of claims 1 to 17 are implemented.

21. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the energy efficiency monitoring method according to any one of claims 1 to 17 are implemented.

22. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the energy efficiency monitoring method according to any one of claims 1 to 17 are implemented.

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