Battery screening method, electronic equipment and storage medium

Abstract

The invention discloses a battery screening method, electronic equipment and a storage medium. The method comprises the following steps: acquiring first actual attenuation voltages of a plurality of to-be-processed batteries in a specified storage duration and first standard attenuation voltages corresponding to the specified storage duration; based on the first actual attenuation voltage and the first standard attenuation voltage, performing first screening on the plurality of to-be-processed batteries to obtain a plurality of first candidate batteries; obtaining a first association relationship between the storage duration corresponding to each first candidate battery and the attenuation voltage; based on the first association relationship, predicting a first predicted attenuation voltage of each first candidate battery in a specified storage duration; and performing second screening on the plurality of first candidate batteries based on the first actual attenuation voltage and the first predicted attenuation voltage to obtain a target battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery screening method, electronic device, and storage medium. Background Technology

[0002] Currently, the industry commonly uses long-term static monitoring (e.g., 30-90 days) to directly measure battery voltage decay and filter out substandard batteries by setting a fixed threshold. However, traditional methods have the problem of misclassifying abnormal batteries as qualified ones, resulting in low accuracy in battery screening. Summary of the Invention

[0003] A battery screening method is provided to improve the accuracy of battery screening.

[0004] Firstly, a battery screening method is provided, comprising the following steps: Obtain the first actual decay voltage of multiple batteries to be processed at a specified storage time and the first standard decay voltage corresponding to the specified storage time; Based on the first actual decay voltage and the first standard decay voltage, a first screening is performed on multiple batteries to be processed to obtain multiple first candidate batteries. Obtain the first correlation between the storage duration and the decay voltage for each first candidate battery; Based on the first correlation, predict the first predicted decay voltage of each first candidate battery at a specified storage time; Based on the first actual decay voltage and the first predicted decay voltage, a second screening is performed on multiple first candidate batteries to obtain the target battery.

[0005] In an exemplary embodiment, based on a first actual decay voltage and a first standard decay voltage, a first screening is performed on a plurality of batteries to be processed to obtain a first candidate battery, including: Among multiple batteries to be processed, the batteries with a first actual decay voltage that is less than a first standard decay voltage are selected as the first candidate batteries.

[0006] In this embodiment, multiple batteries to be processed are uniformly screened using a first standard attenuation voltage. This not only eliminates abnormal batteries whose first actual attenuation voltage exceeds the first standard attenuation voltage, but also improves the screening efficiency of the batteries to be processed.

[0007] In one exemplary embodiment, the battery screening method further includes: Obtain the sampled decay voltage of each first candidate battery over multiple sampling storage durations, where each sampling storage duration is less than a specified storage duration; Based on the sampled decay voltage of each first candidate battery over multiple sampling storage durations, a first correlation relationship is established between the storage duration and decay voltage of each first candidate battery.

[0008] In this embodiment, a corresponding first correlation is established based on the sampled attenuation voltage of the first candidate battery over multiple sampling and storage durations. The voltage attenuation characteristics of the first candidate battery can be reflected through the first correlation, thereby ensuring the accuracy and authenticity of the first predicted attenuation voltage corresponding to the first candidate battery.

[0009] In an exemplary embodiment, based on the sampled attenuation voltage of each first candidate battery over multiple sampling storage durations, a first correlation relationship is established between the storage duration and the attenuation voltage corresponding to each first candidate battery, including: The attenuation parameters are calculated based on the sampled attenuation voltage of each first candidate battery over multiple sampling storage durations. Based on the attenuation parameters, the attenuation function relationship between the storage duration and the attenuation voltage corresponding to each first candidate battery is determined, and the attenuation function relationship is the first correlation relationship.

[0010] In this embodiment, by establishing the decay function relationship of the first candidate battery, the accuracy of the first correlation relationship of the first candidate battery can be guaranteed.

[0011] In an exemplary embodiment, based on a first actual decay voltage and a first predicted decay voltage, a second screening is performed on a plurality of first candidate batteries to obtain a target battery, including: Based on the first actual decay voltage and the first predicted decay voltage of each first candidate battery at a specified storage time, determine the decay voltage deviation corresponding to each first candidate battery. Based on the attenuation voltage deviation corresponding to each first candidate battery, the first candidate battery with an attenuation voltage deviation less than the preset attenuation voltage deviation threshold is selected as the target battery.

[0012] In this embodiment, by comparing the first actual attenuation voltage and the first predicted attenuation voltage, the target battery is screened from the first candidate battery, thus achieving secondary screening of the first candidate battery and ensuring the accuracy of the target battery screening.

[0013] In one exemplary embodiment, the battery screening method further includes: Get the current storage duration of the battery to be processed; When the current storage duration is inconsistent with the specified storage duration, the second actual decay voltage of the battery to be processed at the current storage duration is obtained, and the second correlation between the storage duration and the standard decay voltage is obtained. The second correlation is determined based on the first standard decay voltage corresponding to the specified storage duration. Based on the second correlation, determine the second standard attenuation voltage corresponding to the current storage duration; Based on the second actual decay voltage and the second standard decay voltage of the battery to be processed during the current storage time, the battery to be processed is first screened to obtain the first candidate battery. The current storage duration is used as the specified storage duration. The process proceeds to the step of obtaining the first correlation between the storage duration and the decay voltage of each first candidate battery, until the target battery is obtained.

[0014] In this embodiment, by determining the second standard attenuation voltage corresponding to the current storage duration based on the second correlation when the current storage duration of the battery to be processed is less than or greater than the specified storage duration, the accuracy of the second standard attenuation voltage can be guaranteed, thereby ensuring the accuracy of the screening of the battery to be processed.

[0015] In one exemplary embodiment, the battery screening method further includes: Multiple sample batteries are acquired, and the actual decay voltage of the sample batteries at a specified storage time is equal to the first standard decay voltage corresponding to the specified storage time. Obtain the actual decay voltage of each sample battery over multiple sample storage durations, where each sample storage duration is less than a specified storage duration; Based on the actual attenuation voltage of multiple samples corresponding to each sample storage duration, determine the standard attenuation voltage corresponding to each sample storage duration; By fitting the standard decay voltage corresponding to the storage duration of multiple samples, a second correlation between storage duration and standard decay voltage is obtained.

[0016] In this embodiment, by fitting the standard decay voltage corresponding to the storage duration of multiple samples, a second correlation relationship between the storage duration and the standard decay voltage is obtained, which can ensure the accuracy of the second correlation relationship.

[0017] In one exemplary embodiment, the battery screening method further includes: Get the current storage duration of the battery to be processed; When the current storage duration is inconsistent with the specified storage duration, obtain the first correlation between the storage duration and the attenuation voltage of the battery to be processed; Based on the first correlation relationship corresponding to the battery to be processed, the second predicted decay voltage of the battery to be processed is predicted for a specified storage time. Based on the second predicted decay voltage and the first standard decay voltage, the cells to be processed are subjected to a third screening to obtain the target cells.

[0018] In this embodiment, by performing a third screening based on the second predicted decay voltage of the battery under test at the specified storage time when the current storage time of the battery under test is less than or greater than the specified storage time, the screening efficiency of the battery under test can be improved.

[0019] In an exemplary embodiment, a third screening is performed on the battery to be processed based on a second predicted decay voltage and a first standard decay voltage to obtain a target battery, including: The cells to be processed whose second predicted decay voltage is less than the first standard decay voltage are selected as target cells.

[0020] In this embodiment, by using the battery to be processed whose second predicted decay voltage is less than the first standard decay voltage as the target battery, the screening efficiency of the battery to be processed can be improved.

[0021] Secondly, this application also provides a battery sorting device, which includes: The data acquisition module is used to acquire the first actual decay voltage of multiple batteries to be processed and the first standard decay voltage corresponding to the specified storage time. The first screening module is used to perform a first screening on multiple batteries to be processed based on a first actual decay voltage and a first standard decay voltage to obtain multiple first candidate batteries. The relationship acquisition module is used to acquire the first correlation relationship between the storage duration and the attenuation voltage for each first candidate battery. The prediction module is used to predict the first predicted decay voltage of each first candidate battery at a specified storage time based on the first correlation. The second screening module is used to perform a second screening on multiple first candidate batteries based on the first actual decay voltage and the first predicted decay voltage to obtain the target battery.

[0022] Thirdly, this application also provides an electronic device, including a memory and a processor, the memory storing a computer program for controlling the processor to operate in order to perform the methods in any of the embodiments of any of the above aspects.

[0023] Fourthly, this application also provides a computer-readable storage medium including computer instructions that, when executed by a processor, implement the methods in any of the embodiments described above.

[0024] Fifthly, the present application provides a computer program product that, when executed by a processor, implements the method in any of the above-described embodiments.

[0025] Beneficial effects: By performing a first screening of multiple batteries to be processed based on the first actual decay voltage and the first standard decay voltage at a specified storage time, first candidate batteries are obtained. Batteries with abnormal decay can be screened out based on the first standard decay voltage, thus achieving preliminary screening of batteries to be processed. Then, the first correlation between the storage time and decay voltage of each first candidate battery is obtained, which can accurately reflect the voltage decay characteristics of each first candidate battery related to the storage time. Then, the first predicted decay voltage of the first candidate battery at a specified storage time is determined based on the first correlation, ensuring the accuracy of the first predicted decay voltage. Based on the first actual decay voltage and the first predicted decay voltage of the first candidate battery at a specified storage time, a second screening of the first candidate batteries is performed to obtain target batteries. First candidate batteries that do not meet the decay expectations can be screened out based on the first predicted decay voltage, thus achieving secondary screening of the first candidate batteries and improving the accuracy of battery screening. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic flowchart of a battery screening method provided by an exemplary embodiment of this disclosure; Figure 2 This is another schematic flowchart of the battery screening method provided by an exemplary embodiment of this disclosure; Figure 3 This is a schematic diagram of battery screening based on the voltage drop standard line provided in an exemplary embodiment of this disclosure; Figure 4 This is another schematic flowchart of the battery screening method provided by an exemplary embodiment of this disclosure; Figure 5 This is a schematic diagram of battery screening based on a relation curve provided by an exemplary embodiment of this disclosure; Figure 6 This is an internal structural diagram of an electronic device provided by an exemplary embodiment of this disclosure. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0031] On the one hand, this embodiment provides a battery screening method, such as Figure 1 As shown, it includes the following steps: S101, obtain the first actual decay voltage of multiple batteries to be processed at a specified storage time and the first standard decay voltage corresponding to the specified storage time.

[0032] S102, based on the first actual decay voltage and the first standard decay voltage, perform a first screening on multiple batteries to be processed to obtain multiple first candidate batteries.

[0033] Here, "batteries to be processed" refers to batteries that need to be tested for voltage decay after a period of storage and require screening. Generally, these can be newly manufactured batteries that have been left to stand for a period of time. "Specified storage time" refers to a specified period for which the batteries need to be stored, such as 30 days or 60 days. "Voltage decay voltage" refers to the total voltage change of the battery after voltage decay during storage. "First actual decay voltage" refers to the actual decay voltage collected from the batteries to be processed when the specified storage time has been reached. "First standard decay voltage" is the standard decay voltage corresponding to the specified storage time and is used to detect the first actual decay voltage of the batteries to be processed. "Standard decay voltage" refers to the maximum allowable voltage decay of the battery during storage. "First screened batteries" refers to the batteries that have been screened out of the batteries to be processed.

[0034] For example, in response to the filtering instruction for the battery to be processed, the terminal obtains the first actual decay voltage of multiple batteries to be processed at a specified storage time. Generally, the battery to be processed can be a battery whose actual storage time reaches the specified storage time. This can be achieved by collecting the actual voltage of the battery to be processed at the specified storage time, and then obtaining the first actual decay voltage of the battery to be processed based on the difference between the initial voltage of the battery to be processed before static storage and the collected actual voltage.

[0035] The terminal also acquires a first standard attenuation voltage corresponding to a specified storage duration. This first standard attenuation voltage can be used as an attenuation voltage threshold for the specified storage duration. Since voltage attenuation accumulates with storage duration, different storage durations correspond to different standard attenuation voltages. The terminal compares the first actual attenuation voltage of multiple batteries to be processed with the first standard attenuation voltage, and filters the multiple batteries to be processed based on the comparison results. This can involve filtering out batteries whose first actual attenuation voltage is less than the first standard attenuation voltage to obtain the first candidate batteries.

[0036] S103, obtain the first correlation between the storage duration and the decay voltage corresponding to each first candidate battery.

[0037] S104, based on the first correlation, predict the first predicted decay voltage of each first candidate battery at a specified storage time.

[0038] For example, after filtering multiple batteries to be processed to obtain a first candidate battery, the terminal obtains a first correlation between the storage time and the decay voltage of each first candidate battery. The first correlation can be a functional relationship between the decay voltage of the battery to be processed and the storage time, which can characterize the voltage decay law of the battery to be processed. Then, based on the first correlation, the terminal determines the first predicted decay voltage of the corresponding first candidate battery at a specified storage time. The first predicted decay voltage can be understood as the decay voltage of the first candidate battery estimated at a specified storage time based on the voltage decay law characterized by the first correlation.

[0039] In an exemplary embodiment, the actual decay voltage corresponding to multiple storage durations of the battery to be processed during the storage period can be collected, and a first correlation relationship between the storage duration and decay voltage corresponding to the battery to be processed can be established based on the collected multiple actual decay voltages and the corresponding storage durations.

[0040] S105, based on the first actual decay voltage and the first predicted decay voltage, perform a second screening on multiple first candidate batteries to obtain the target battery.

[0041] For example, the first predicted decay voltage can be used as a reference decay voltage of the corresponding first candidate battery for a specified storage time. The first actual decay voltage of each first candidate battery is compared with the corresponding first predicted decay voltage. The first candidate batteries can be screened a second time based on the decay voltage difference between the first actual decay voltage and the first predicted decay voltage of each first candidate battery to obtain a target battery, which represents a qualified normal battery.

[0042] In this embodiment, multiple batteries to be processed are first screened based on the first actual decay voltage and the first standard decay voltage at a specified storage time to obtain first candidate batteries. Batteries with abnormal decay can be screened out based on the first standard decay voltage, thus achieving preliminary screening of the batteries to be processed. Then, the first correlation between the storage time and decay voltage of each first candidate battery is obtained, which can accurately reflect the voltage decay characteristics of each first candidate battery related to the storage time. Then, the first predicted decay voltage of the first candidate battery at a specified storage time is determined based on the first correlation, ensuring the accuracy of the first predicted decay voltage. Based on the first actual decay voltage and the first predicted decay voltage of the first candidate battery at a specified storage time, the first candidate batteries are second screened to obtain target batteries. First candidate batteries that do not meet the decay expectations can be screened out based on the first predicted decay voltage, thus achieving secondary screening of the first candidate batteries and improving the accuracy of battery screening.

[0043] In an exemplary embodiment, S102, based on a first actual attenuation voltage and a first standard attenuation voltage, a first screening is performed on a plurality of batteries to be processed to obtain a plurality of first candidate batteries, including: Among multiple batteries to be processed, the batteries with a first actual decay voltage that is less than a first standard decay voltage are selected as the first candidate batteries.

[0044] For example, the first standard decay voltage can be used as a unified decay voltage threshold for multiple batteries to be processed for a specified storage time. After obtaining the first actual decay voltage corresponding to multiple batteries to be processed, the terminal performs a first screening on the first actual decay voltage of multiple batteries to be processed according to the first standard decay voltage, and selects the batteries to be processed whose first actual decay voltage is less than the first standard decay voltage as the first candidate batteries.

[0045] Specifically, the terminal compares the first actual voltage decay of each battery to be processed with the first standard voltage decay. If the first actual voltage decay of the battery to be processed is greater than or equal to the first standard voltage decay, it indicates that the voltage decay of the battery to be processed during storage exceeds the maximum allowable voltage decay, and the battery to be processed is identified as an abnormally decayed battery. If the first actual voltage decay of the battery to be processed is less than the first standard voltage decay, it indicates that the voltage decay of the battery to be processed during storage is within the maximum allowable voltage decay range, and the battery to be processed is identified as a first candidate battery.

[0046] In this embodiment, multiple batteries to be processed are uniformly screened using a first standard attenuation voltage. This not only eliminates abnormal batteries whose first actual attenuation voltage exceeds the first standard attenuation voltage, but also improves the screening efficiency of the batteries to be processed.

[0047] In one exemplary embodiment, such as Figure 2 As shown, the battery screening method also includes: S201, obtain the sampled attenuation voltage of each first candidate battery over multiple sampling storage durations, where each sampling storage duration is less than a specified storage duration; S202, based on the sampled attenuation voltage of each first candidate battery over multiple sampling storage durations, establish a first correlation between the storage duration and attenuation voltage of each first candidate battery.

[0048] For example, the terminal can obtain the sampled attenuation voltage of each first candidate battery at multiple specified sampled storage durations, where each sampled storage duration is less than the specified storage duration.

[0049] The multiple sampling storage durations can be determined based on a specified storage duration. For example, a candidate duration range can be determined within a specified storage duration according to a preset duration ratio. This range can represent the sampling period of the first candidate battery. Then, a preset number of storage durations can be selected as the sampling storage durations within the candidate duration range. For example, if the specified storage duration is 60 days and the preset duration ratio is 5%, then the candidate duration range is 30 days. Since the voltage decay of the battery is relatively stable in the early stage of storage, the 3rd day, the 10th day, and the 15th day can be selected as the sampling storage durations within the first 30 days of the specified storage duration of 60 days.

[0050] The terminal fits the sampled attenuation voltage of each first candidate battery across multiple sampling storage durations according to a preset functional relationship, obtaining a first correlation between the storage duration and attenuation voltage for each first candidate battery. It is understandable that, since the first correlation is determined based on the sampled attenuation voltage of the first candidate battery, the overall voltage attenuation pattern represented by the first correlation is consistent with the voltage attenuation pattern represented by the multiple sampled attenuation voltages.

[0051] In this embodiment, a corresponding first correlation is established based on the sampled attenuation voltage of the first candidate battery over multiple sampling and storage durations. The voltage attenuation characteristics of the first candidate battery can be reflected through the first correlation, thereby ensuring the accuracy and authenticity of the first predicted attenuation voltage corresponding to the first candidate battery.

[0052] In an exemplary embodiment, S202, based on the sampled attenuation voltage of each first candidate battery over multiple sampling storage durations, a first correlation relationship is established between the storage duration and attenuation voltage corresponding to each first candidate battery, including: The attenuation parameters are calculated based on the sampled attenuation voltage of each first candidate battery over multiple sampling storage durations. Based on the attenuation parameters, the attenuation function relationship between the storage duration and the attenuation voltage corresponding to each first candidate battery is determined, and the attenuation function relationship is the first correlation relationship.

[0053] For example, the terminal calculates the attenuation parameter for the sampled attenuation voltage of any first candidate battery over multiple sampling storage durations, wherein the attenuation parameter is different for different first candidate batteries. Then, based on the calculated attenuation parameter, an attenuation function relationship between the storage duration and the attenuation voltage corresponding to the first candidate battery is established as the first association relationship corresponding to the first candidate battery, thereby obtaining the first association relationship corresponding to each first candidate battery. The attenuation function relationship is shown in formula (1).

[0054] (1) in, OCV(t) represents the predicted decay voltage; OCV(0) represents the initial voltage; t represents the storage duration; e represents the natural base; b and c represent the decay parameters.

[0055] In this embodiment, by establishing the decay function relationship of the first candidate battery, the accuracy of the first correlation relationship of the first candidate battery can be guaranteed.

[0056] In an exemplary embodiment, S104, based on the first actual decay voltage and the first predicted decay voltage, a second screening is performed on a plurality of first candidate batteries to obtain a target battery, including: Based on the first actual decay voltage and the first predicted decay voltage of each first candidate battery at a specified storage time, determine the decay voltage deviation corresponding to each first candidate battery. Based on the attenuation voltage deviation corresponding to each first candidate battery, the first candidate battery with an attenuation voltage deviation less than the preset attenuation voltage deviation threshold is selected as the target battery.

[0057] For example, after obtaining the first predicted decay voltage of each first candidate battery for a specified storage time according to the first association relationship, the terminal uses the first predicted decay voltage as the reference decay voltage of the first candidate battery for the specified storage time, which can be understood as the decay voltage that meets the decay expectation.

[0058] Then, the difference between the first actual attenuation voltage and the first predicted attenuation voltage corresponding to the first candidate battery is calculated to obtain the attenuation voltage deviation for each first candidate battery. A preset attenuation voltage deviation threshold is obtained, and the attenuation voltage deviation of the first candidate batteries is further filtered based on the preset attenuation voltage deviation threshold. First candidate batteries with attenuation voltage deviations less than the preset attenuation voltage deviation threshold are selected as target batteries.

[0059] Specifically, the attenuation voltage deviation corresponding to each first candidate battery is compared with a preset attenuation voltage deviation threshold. When the attenuation voltage deviation of a first candidate battery is greater than or equal to the preset attenuation voltage deviation threshold, it indicates that the actual attenuation voltage of the first candidate battery during the specified storage duration does not conform to the attenuation expectation represented by the first predicted attenuation voltage. Further, this can be understood as the voltage attenuation pattern of the first candidate battery in the later stages of storage not conforming to the voltage attenuation pattern represented by the first correlation relationship corresponding to that first candidate battery. For example, if the voltage attenuation degree of the first candidate battery in the non-sampling period (generally the later stages of storage) is inconsistent with the voltage attenuation degree of the first candidate battery in the sampling period—for instance, if the voltage attenuation degree of the first candidate battery in the non-sampling period is greater than the voltage attenuation degree in the sampling period—then the first candidate battery is identified as an abnormal battery.

[0060] When the attenuation voltage deviation of the first candidate battery is less than the preset attenuation voltage deviation threshold, it means that the actual attenuation voltage of the first candidate battery during the specified storage time meets the attenuation expectation characterized by the first predicted attenuation voltage. This indicates that the voltage attenuation degree of the first candidate battery during the non-sampling period is consistent with the voltage attenuation degree during the sampling period, and the first candidate battery is determined as the target battery.

[0061] In this embodiment, by comparing the first actual attenuation voltage and the first predicted attenuation voltage, the target battery is screened from the first candidate battery, thus achieving secondary screening of the first candidate battery and ensuring the accuracy of the target battery screening.

[0062] In one exemplary embodiment, the battery screening method further includes: Based on the first predicted decay voltage, determine the first predicted voltage of each first candidate battery at a specified storage time; Obtain the first actual voltage of each first candidate battery at a specified storage duration; Based on the first actual voltage and the first predicted voltage of each first candidate battery at a specified storage time, determine the voltage deviation corresponding to each first candidate battery; Based on the voltage deviation corresponding to each first candidate battery, the first candidate battery with a voltage deviation less than a preset voltage deviation threshold is selected as the target battery.

[0063] The first actual voltage is the actual voltage collected by the first candidate battery during a specified storage period.

[0064] For example, after obtaining the first predicted decay voltage of each first candidate battery for a specified storage time according to the first association relationship, the terminal can determine the first predicted voltage of each first candidate battery for a specified storage time based on the first predicted decay voltage. For example, it can calculate the difference between the initial voltage of the first candidate battery and the first predicted decay voltage to obtain the first predicted voltage. The formula for calculating the predicted voltage is shown in formula (2).

[0065] (2) Where OCV(t) represents the predicted voltage for storage duration t.

[0066] Then, the difference between the first actual voltage and the first predicted voltage corresponding to the first candidate battery is calculated to obtain the voltage deviation for each first candidate battery. A preset voltage deviation threshold is obtained, and the first candidate batteries are then screened according to the preset voltage deviation threshold to select the first candidate batteries with voltage deviations less than the preset voltage deviation threshold as target batteries.

[0067] In this embodiment, by comparing the first actual voltage and the first predicted voltage, the target battery is screened from the first candidate battery, thus achieving a secondary screening of the first candidate battery and ensuring the accuracy of the target battery screening.

[0068] In one exemplary embodiment, the battery screening method further includes: Get the current storage duration of the battery to be processed; When the current storage duration is inconsistent with the specified storage duration, the second actual decay voltage of the battery to be processed at the current storage duration is obtained, and the second correlation between the storage duration and the standard decay voltage is obtained. The second correlation is determined based on the first standard decay voltage corresponding to the specified storage duration. Based on the second correlation, determine the second standard attenuation voltage corresponding to the current storage duration; Based on the second actual decay voltage and the second standard decay voltage of the battery to be processed during the current storage time, the battery to be processed is first screened to obtain the first candidate battery. The current storage duration is used as the specified storage duration, and the process proceeds to the step of obtaining the first correlation between the storage duration and the decay voltage of each first candidate battery, until the target battery is obtained.

[0069] For example, the terminal obtains the current storage duration corresponding to the battery to be processed. When the current storage duration reaches the specified storage duration, it proceeds to the step of obtaining the first actual decay voltage of multiple batteries to be processed at the specified storage duration and the first standard decay voltage corresponding to the specified storage duration, until the target battery is obtained.

[0070] When the current storage duration is inconsistent with the specified storage duration, i.e., the current storage duration is less than or greater than the specified storage duration, the second actual decay voltage of the battery to be processed at the current storage duration is obtained, and the second correlation between the storage duration and the standard decay voltage is obtained. The second correlation can be determined based on the first standard decay voltage corresponding to the specified storage duration, and is a mapping relationship between the storage duration and the standard decay voltage, including the standard decay voltage corresponding to each storage duration.

[0071] Based on the second correlation, a second standard attenuation voltage corresponding to the current storage duration is determined, and this second standard attenuation voltage is used as a unified attenuation voltage threshold for the battery to be processed during the current storage duration. A first screening is performed on the second actual attenuation voltage of the battery to be processed based on the second standard attenuation voltage, and batteries whose second actual attenuation voltage is less than the second standard attenuation voltage are selected as first candidate batteries.

[0072] Then, the current storage duration is used as the specified storage duration, and the process proceeds to obtain the first actual decay voltage of multiple batteries to be processed at the specified storage duration and the first standard decay voltage corresponding to the specified storage duration, until the target battery is obtained.

[0073] In this embodiment, by determining the second standard attenuation voltage corresponding to the current storage duration based on the second correlation when the current storage duration of the battery to be processed is less than or greater than the specified storage duration, the accuracy of the second standard attenuation voltage can be guaranteed, thereby ensuring the accuracy of the screening of the battery to be processed.

[0074] In one exemplary embodiment, the battery screening method further includes: Multiple sample batteries are acquired, and the actual decay voltage of the sample batteries at a specified storage time is equal to the first standard decay voltage corresponding to the specified storage time. Obtain the actual decay voltage of each sample battery over multiple sample storage durations, where each sample storage duration is less than a specified storage duration; Based on the actual attenuation voltage of multiple samples corresponding to each sample storage duration, determine the standard attenuation voltage corresponding to each sample storage duration; By fitting the standard decay voltage corresponding to the storage duration of multiple samples, a second correlation between storage duration and standard decay voltage is obtained.

[0075] In the case where the first standard attenuation voltage corresponding to a specified storage duration is known, but the standard attenuation voltage corresponding to other storage durations is unknown, a second correlation between storage duration and standard attenuation voltage can be determined based on the first standard attenuation voltage corresponding to the specified storage duration. Then, the standard attenuation voltage corresponding to other storage durations can be determined based on the second correlation.

[0076] For example, multiple sample batteries are obtained, the battery type of the sample batteries is the same as that of the battery to be processed, and the actual decay voltage of the sample batteries at a specified storage time is equal to the first standard decay voltage corresponding to the specified storage time.

[0077] The actual decay voltage of each sample battery is collected over multiple sample storage durations, and this is taken as the sample's actual decay voltage. Each sample storage duration is less than a specified storage duration. Based on the actual decay voltages of multiple samples corresponding to each sample storage duration, a standard decay voltage corresponding to each sample storage duration is determined. This can be done, for example, by using the mean or standard deviation of the actual decay voltages of multiple samples. Then, the standard decay voltages corresponding to multiple sample storage durations are fitted, for example, using linear fitting, to obtain a second correlation between storage duration and standard decay voltage.

[0078] In this embodiment, by fitting the standard decay voltage corresponding to the storage duration of multiple samples, a second correlation relationship between the storage duration and the standard decay voltage is obtained, which can ensure the accuracy of the second correlation relationship.

[0079] In one exemplary embodiment, such as Figure 3 The diagram shown illustrates a battery screening method based on a voltage drop standard. Figure 3 The medium voltage drop standard line represents the second correlation between the standard decay voltage and the storage duration, and Figure 3 The points in the diagram represent the actual degradation voltage of different batches of batteries to be processed. The current storage duration varies between different batches of batteries to be processed. Figure 3 This allows for the screening out of batteries whose actual attenuation voltage exceeds the corresponding standard attenuation voltage, and the remaining batteries to be processed are used as the first candidate batteries.

[0080] In one exemplary embodiment, such as Figure 4 As shown, the battery screening method also includes: S401, Obtain the current storage duration of the battery to be processed; S402, when the current storage duration is inconsistent with the specified storage duration, obtain the first correlation relationship between the storage duration and the attenuation voltage of the battery to be processed; S403, based on the first correlation relationship corresponding to the battery to be processed, predict the second predicted decay voltage of the battery to be processed during the specified storage time; S404, based on the second predicted decay voltage and the first standard decay voltage, performs a third screening on the battery to be processed to obtain the target battery.

[0081] The second predicted decay voltage refers to the predicted decay voltage of the battery to be processed at the specified storage time, which is predicted based on the first correlation relationship when the current storage time is less than or greater than the specified storage time.

[0082] For example, the terminal obtains the current storage duration corresponding to the battery to be processed. When the current storage duration is inconsistent with the specified storage duration, that is, when the current storage duration is less than or greater than the specified storage duration, it can also predict the second predicted attenuation voltage of the battery to be processed at the specified storage duration based on the first association relationship of the battery to be processed. Based on the first standard attenuation voltage corresponding to the specified storage duration, the second predicted attenuation voltage of the battery to be processed is further filtered to obtain the target battery.

[0083] In this embodiment, by performing a third screening based on the second predicted decay voltage of the battery under test at the specified storage time when the current storage time of the battery under test is less than or greater than the specified storage time, the screening efficiency of the battery under test can be improved.

[0084] In an exemplary embodiment, S404, based on the second predicted decay voltage and the first standard decay voltage, a third screening is performed on the battery to be processed to obtain the target battery, including: The cells to be processed whose second predicted decay voltage is less than the first standard decay voltage are selected as target cells.

[0085] For example, the terminal compares the second predicted decay voltage of each battery to be processed with the first standard decay voltage, and selects the battery to be processed whose second predicted decay voltage is less than the first standard decay voltage as the target battery.

[0086] In this embodiment, by using the battery to be processed whose second predicted decay voltage is less than the first standard decay voltage as the target battery, the screening efficiency of the battery to be processed can be improved.

[0087] In one exemplary embodiment, the battery screening method further includes: Get the current storage duration of the battery to be processed; When the current storage duration is less than or greater than the specified storage duration, obtain the first correlation relationship between the storage duration and the attenuation voltage of the battery to be processed, and determine the first relationship curve for each battery to be processed based on the first correlation relationship. Obtain the second correlation between storage duration and standard attenuation voltage, and determine the second relationship curve corresponding to the second correlation. Based on the first and second relationship curves of each battery to be processed, a fourth screening is performed on the batteries to be processed to obtain the target batteries.

[0088] Among them, based on the first and second relationship curves of each battery to be processed, a fourth screening is performed on the batteries to be processed to obtain target batteries, including: The first and second relationship curves of each battery to be processed are converted into the first target relationship curve and the second target relationship curve under the same coordinate axis. In the first target relationship curve corresponding to each battery to be processed, the battery to be processed whose first target relationship curve is below the second target relationship curve is taken as the target battery.

[0089] For example, such as Figure 5 As shown, a schematic diagram of battery screening based on a relationship curve is provided. Figure 5 The multiple solid lines in the graph represent the first target relationship curves of multiple batteries to be processed on the same coordinate axis, and... Figure 5 The dashed line in the graph represents the second target relationship curve corresponding to the second correlation, i.e., the standard pressure drop curve. This can be derived from... Figure 5 As is known, batteries belonging to the first target relationship curve that are above the second target relationship curve are classified as NG, indicating that the predicted decay voltage of the battery to be processed is greater than the corresponding standard decay voltage at each storage duration, thus determining that the battery to be processed is an abnormal battery. Batteries belonging to the first target relationship curve that are below the second target relationship curve are classified as OK, indicating that the predicted decay voltage of the battery to be processed is less than the corresponding standard decay voltage at each storage duration, thus determining that the battery to be processed is a normal target battery.

[0090] In this embodiment, by comparing the first target relationship curve and the second target relationship curve, the screening efficiency of the batteries to be processed can be improved.

[0091] In one exemplary embodiment, newly produced batteries to be processed may be screened. For example, after each batch of batteries is produced and voltage alignment is completed, they are left to stand for 7-14 days, and the initial voltage OCV(0) is measured and recorded. The batteries are then placed in a warehouse for storage, with the storage time varying from 7-14 days depending on the actual production schedule. On the day of shipment, i.e., when the current storage time of the batteries reaches the specified storage time, the voltage of the batteries to be processed in the warehouse is tested, the actual voltage of the batteries to be processed is recorded, and the actual voltage drop, i.e., the actual voltage decay, is calculated based on the initial voltage and the actual voltage.

[0092] Obtain the pre-established voltage drop standard curve for the product, and filter the actual voltage against the standard decay voltage at the time of shipment in the voltage drop standard curve to obtain the first candidate battery; According to formula (1): (t is the actual number of days the batch of batteries was stored), predict the predicted decay voltage of the first candidate battery, compare the predicted decay voltage with the actual decay voltage, if the difference between the predicted decay voltage and the actual decay voltage is within the acceptable range, the battery is deemed acceptable; if it exceeds the range, it is deemed unacceptable and is screened out.

[0093] On the other hand, this embodiment provides a battery screening device, which includes: The data acquisition module is used to acquire the first actual decay voltage of multiple batteries to be processed and the first standard decay voltage corresponding to the specified storage time. The first screening module is used to perform a first screening on multiple batteries to be processed based on a first actual decay voltage and a first standard decay voltage to obtain multiple first candidate batteries. The relationship acquisition module is used to acquire the first correlation relationship between the storage duration and the attenuation voltage for each first candidate battery. The prediction module is used to predict the first predicted decay voltage of each first candidate battery at a specified storage time based on the first correlation. The second screening module is used to perform a second screening on multiple first candidate batteries based on the first actual decay voltage and the first predicted decay voltage to obtain the target battery.

[0094] In an exemplary embodiment, the first screening module is further configured to screen out batteries from a plurality of batteries to be processed whose first actual attenuation voltage is less than the first standard attenuation voltage, as first candidate batteries.

[0095] In an exemplary embodiment, the battery screening device is further configured to obtain the sampled attenuation voltage of each first candidate battery over multiple sampled storage durations, each sampled storage duration being less than a specified storage duration; and based on the sampled attenuation voltage of each first candidate battery over multiple sampled storage durations, establish a first correlation relationship between the storage duration and the attenuation voltage corresponding to each first candidate battery.

[0096] In an exemplary embodiment, the battery screening device is further configured to calculate an attenuation parameter based on the sampled attenuation voltage of each first candidate battery over multiple sampled storage durations; and based on the attenuation parameter, determine the attenuation function relationship between the storage duration and the attenuation voltage corresponding to each first candidate battery, wherein the attenuation function relationship is a first correlation relationship.

[0097] In an exemplary embodiment, the second screening module is further configured to determine the attenuation voltage deviation corresponding to each first candidate battery based on the first actual attenuation voltage and the first predicted attenuation voltage of each first candidate battery at a specified storage time; and to screen out first candidate batteries whose attenuation voltage deviation is less than a preset attenuation voltage deviation threshold based on the attenuation voltage deviation corresponding to each first candidate battery, as target batteries.

[0098] In an exemplary embodiment, the battery screening device is further configured to: obtain the current storage duration corresponding to the battery to be processed; when the current storage duration is inconsistent with the specified storage duration, obtain the second actual decay voltage of the battery to be processed at the current storage duration, and obtain a second correlation between the storage duration and the standard decay voltage, the second correlation being determined based on the first standard decay voltage corresponding to the specified storage duration; determine the second standard decay voltage corresponding to the current storage duration based on the second correlation; perform a first screening on the battery to be processed based on the second actual decay voltage and the second standard decay voltage of the battery to be processed at the current storage duration to obtain a first candidate battery; and use the current storage duration as the specified storage duration to proceed to the step of obtaining the first correlation between the storage duration and the decay voltage corresponding to each first candidate battery until a target battery is obtained.

[0099] In an exemplary embodiment, the battery screening device is further configured to acquire multiple sample batteries, wherein the actual decay voltage of the sample batteries at a specified storage time is equal to a first standard decay voltage corresponding to the specified storage time; acquire the actual decay voltage of each sample battery at multiple sample storage times, wherein each sample storage time is less than the specified storage time; determine the standard decay voltage corresponding to each sample storage time based on the multiple actual decay voltages corresponding to each sample storage time; and fit the standard decay voltages corresponding to the multiple sample storage times respectively to obtain a second correlation between the storage time and the standard decay voltage.

[0100] In an exemplary embodiment, the battery screening device is further configured to: obtain the current storage duration of the battery to be processed; when the current storage duration is inconsistent with the specified storage duration, obtain a first correlation between the storage duration and the decay voltage of the battery to be processed; predict a second predicted decay voltage of the battery to be processed at the specified storage duration based on the first correlation between the battery to be processed; and perform a third screening on the battery to be processed based on the second predicted decay voltage and the first standard decay voltage to obtain the target battery.

[0101] In one exemplary embodiment, the battery screening device is further configured to select batteries to be processed with a second predicted decay voltage that is less than a first standard decay voltage as target batteries.

[0102] Each module in the battery screening device of the aforementioned energy storage equipment can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0103] Thirdly, this embodiment provides an electronic device, including a memory and a processor. The memory stores computer instructions, and when the computer instructions are executed by the processor, they implement the method of any of the above embodiments.

[0104] In one embodiment, this embodiment also provides an electronic device, which may be a server, and its internal structure diagram may be as follows. Figure 6 As shown, this electronic device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer instructions, and a database. The internal memory provides an environment for the operation of the operating system and computer instructions stored in the non-volatile storage media. The database stores data involved in business data processing methods. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer instructions are executed by the processor, a communication configuration method for an energy storage device is implemented.

[0105] Those skilled in the art will understand that Figure 6The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0106] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer instructions thereon, which are loaded by a processor to execute the arrangements in any of the methods described above. In embodiments of this application, the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0107] Fifthly, embodiments of this application provide a computer program product, including a computer program or instructions, which are executed by a processor to implement the steps of any of the methods described above.

[0108] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0109] The battery screening method, electronic device, and computer-readable storage medium provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery screening method, characterized in that, Includes the following steps: Obtain the first actual decay voltage of multiple batteries to be processed at a specified storage time and the first standard decay voltage corresponding to the specified storage time; Based on the first actual attenuation voltage and the first standard attenuation voltage, a first screening is performed on a plurality of batteries to be processed to obtain a plurality of first candidate batteries; Obtain the first correlation between the storage duration and the decay voltage for each of the first candidate batteries; Based on the first correlation, predict the first predicted decay voltage of each first candidate battery during the specified storage time; Based on the first actual decay voltage and the first predicted decay voltage, a second screening is performed on multiple first candidate batteries to obtain the target battery.

2. The method according to claim 1, characterized in that, The first screening of multiple batteries to be processed based on the first actual attenuation voltage and the first standard attenuation voltage to obtain a first candidate battery includes: Among the multiple batteries to be processed, the batteries whose first actual decay voltage is less than the first standard decay voltage are selected as the first candidate batteries.

3. The method according to claim 1, characterized in that, The method further includes: Obtain the sampled decay voltage of each first candidate battery over multiple sampled storage durations, where each sampled storage duration is less than the specified storage duration; Based on the sampled decay voltage of each first candidate battery during multiple sampled storage durations, a first correlation relationship is established between the storage duration and decay voltage corresponding to each first candidate battery.

4. The method according to claim 3, characterized in that, The step of establishing a first correlation between the storage duration and the attenuation voltage of each first candidate battery based on the sampled attenuation voltage of each first candidate battery over multiple sampled storage durations includes: Based on the sampled attenuation voltage of each first candidate battery during multiple sampled storage durations, attenuation parameters are calculated; Based on the attenuation parameters, the attenuation function relationship between the storage duration and the attenuation voltage corresponding to each first candidate battery is determined, and the attenuation function relationship is the first correlation relationship.

5. The method according to claim 1, characterized in that, The step of performing a second screening on multiple first candidate batteries based on the first actual decay voltage and the first predicted decay voltage to obtain a target battery includes: Based on the first actual decay voltage and the first predicted decay voltage of each first candidate battery during the specified storage time, determine the decay voltage deviation corresponding to each first candidate battery; Based on the attenuation voltage deviation corresponding to each of the first candidate batteries, the first candidate batteries whose attenuation voltage deviation is less than a preset attenuation voltage deviation threshold are selected as the target batteries.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: Get the current storage duration of the battery to be processed; When the current storage duration is inconsistent with the specified storage duration, the second actual decay voltage of the battery to be processed at the current storage duration is obtained, and a second correlation relationship between the storage duration and the standard decay voltage is obtained. The second correlation relationship is determined based on the first standard decay voltage corresponding to the specified storage duration. Based on the second correlation, the second standard attenuation voltage corresponding to the current storage duration is determined; Based on the second actual decay voltage and the second standard decay voltage of the battery to be processed at the current storage time, the battery to be processed is first screened to obtain a first candidate battery; The current storage duration is used as the specified storage duration, and the process proceeds to the step of obtaining the first correlation between the storage duration and the decay voltage for each first candidate battery, until the target battery is obtained.

7. The method according to claim 6, characterized in that, The method further includes: Multiple sample batteries are acquired, wherein the actual decay voltage of the sample batteries at the specified storage duration is equal to the first standard decay voltage corresponding to the specified storage duration; Obtain the actual decay voltage of each sample battery over multiple sample storage durations, where each sample storage duration is less than the specified storage duration; Based on the actual attenuation voltages of multiple samples corresponding to each sample storage duration, determine the standard attenuation voltage corresponding to each sample storage duration; By fitting the standard decay voltage corresponding to the storage duration of each of the multiple samples, a second correlation between the storage duration and the standard decay voltage is obtained.

8. The method according to any one of claims 1-5, characterized in that, The method further includes: Get the current storage duration of the battery to be processed; When the current storage duration is inconsistent with the specified storage duration, a first correlation relationship between the storage duration and the attenuation voltage of the battery to be processed is obtained; Based on the first correlation relationship corresponding to the battery to be processed, a second predicted decay voltage of the battery to be processed is predicted during the specified storage time. Based on the second predicted decay voltage and the first standard decay voltage, the battery to be processed is subjected to a third screening to obtain the target battery.

9. The method according to claim 8, characterized in that, The third screening of the battery to be processed based on the second predicted decay voltage and the first standard decay voltage to obtain the target battery includes: The battery to be processed whose second predicted decay voltage is less than the first standard decay voltage is selected as the target battery.

10. An electronic device, characterized in that, The electronic device includes a processor and a memory, the memory storing a computer program configured to be executed by the processor to implement the steps of the method according to any one of claims 1 to 9.

11. A computer storage medium, characterized in that, The computer storage medium stores a computer program configured to be executed by a processor to implement the method of any one of claims 1 to 9.

Images