Battery screening method and device, electronic equipment and medium

Abstract

The invention provides a battery screening method and device, electronic equipment and a medium, and relates to an energy storage battery technology. The method comprises the following steps: determining the correlation between the discharge voltage and the discharge capacity of a to-be-detected battery according to the discharge data of the to-be-detected battery; screening the to-be-detected battery according to the correlation to obtain a screening result; the screening result is used for indicating whether the to-be-detected battery meets requirements. According to the method, the battery screening efficiency can be effectively improved.

Description

Technical Field

[0001] The present application relates to energy storage battery technology, and in particular to a battery screening method, device, electronic equipment and medium. Background Art

[0002] After retirement, lithium-ion power batteries can still play their residual value in fields with lower requirements for electrical performance. For example, retired batteries can continue to be used in energy storage systems or low-speed electric vehicles.

[0003] However, since retired batteries have experienced different operating conditions (such as charge and discharge rates, temperature changes, number of cycles, etc.) during their service life, the degree of aging of these retired batteries will vary significantly. Therefore, in order to maximize the value of retired batteries during the reorganization stage, it is necessary to identify and screen high-quality retired batteries to improve the performance of the reorganized products.

[0004] At present, the known technologies have high requirements for battery data used to screen retired batteries. The data needs to be obtained through specific environments or specific tests, or even after complex processing. As a result, there is a defect of high complexity in the screening process, which is not conducive to ensuring screening efficiency. Summary of the invention

[0005] The present application provides a battery screening method, device, electronic equipment and medium to reduce screening complexity, thereby facilitating the guarantee of screening efficiency.

[0006] In a first aspect, the present application provides a battery screening method, the method comprising:

[0007] Determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested;

[0008] The battery to be tested is screened according to the correlation to obtain a screening result; the screening result is used to indicate whether the battery to be tested meets the requirements.

[0009] In a possible implementation, determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes:

[0010] Acquire discharge data of the battery to be tested within a preset voltage range, and determine, based on the discharge data, a correlation between the discharge voltage and the discharge capacity of the battery to be tested within the preset voltage range;

[0011] Wherein, the preset voltage range is determined by the voltage stable region corresponding to the battery to be tested.

[0012] In a possible implementation manner, the maximum value of the preset voltage range is smaller than the minimum value of the voltage stable region corresponding to the battery to be tested.

[0013] In a possible implementation, the discharge data includes a change in the discharge voltage of the battery to be tested over time, and a change in the discharge capacity of the battery to be tested over time;

[0014] The correlation is at least used to indicate: a change in one of the discharge voltage and the discharge capacity relative to the other.

[0015] In a possible implementation, determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes:

[0016] According to the discharge data of the battery to be tested within a preset voltage range, calculating the discharge capacity change value within a target voltage range as the correlation;

[0017] Wherein, the target voltage range belongs to the preset voltage range.

[0018] In a possible implementation, screening the batteries to be tested according to the correlation to obtain screening results includes:

[0019] If the discharge capacity change value is not greater than the preset capacity change value, it is determined that the screening result of the battery to be tested meets the requirements; and / or,

[0020] If the discharge capacity change value is greater than the preset capacity change value, it is determined that the screening result of the battery to be tested does not meet the requirements.

[0021] In a possible implementation, determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes:

[0022] According to the discharge data of the battery to be tested within a preset voltage range, a discharge voltage change value within a target capacity range is calculated as the correlation; wherein the target capacity range belongs to a preset capacity range corresponding to the preset voltage range.

[0023] In a possible implementation, screening the batteries to be tested according to the correlation to obtain screening results includes:

[0024] If the discharge voltage change value is less than the preset voltage change value, it is determined that the screening result of the battery to be tested does not meet the requirements; and / or,

[0025] If the discharge voltage change value is not less than the preset voltage change value, it is determined that the screening result of the battery to be tested meets the requirement.

[0026] In a possible implementation, determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes:

[0027] According to the discharge data of the battery to be tested within the preset voltage range, the discharge voltage change value within the target capacity range and the discharge capacity change value corresponding to the target capacity range are calculated; or, the discharge capacity change value within the target voltage range and the discharge voltage change value within the target voltage range are calculated; wherein the target capacity range belongs to the preset capacity range corresponding to the preset voltage range;

[0028] A tangent value is calculated according to the discharge voltage change value and the discharge capacity change value, and a target angle corresponding to the tangent value is used as the correlation.

[0029] In a possible implementation, when the tangent value is the ratio of the discharge voltage change value to the discharge capacity change value, screening the battery to be tested according to the correlation to obtain a screening result includes:

[0030] If the target angle is less than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements; and / or,

[0031] If the target angle is not less than the preset angle, it is determined that the screening result of the battery to be tested meets the requirement.

[0032] In a possible implementation, when the tangent value is the ratio of the discharge capacity change value to the discharge voltage change value, screening the battery to be tested according to the correlation to obtain a screening result includes:

[0033] If the target angle is not greater than the preset angle, it is determined that the screening result of the battery to be tested meets the requirements; and / or,

[0034] If the target angle is greater than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements.

[0035] In a possible implementation, the calculating of the tangent value according to the discharge voltage change value and the discharge capacity change value, and taking the target angle corresponding to the tangent value as the correlation relationship, includes:

[0036] Performing data standardization processing on the discharge voltage change value and the discharge capacity change value so that the discharge voltage change value and the discharge capacity change value have the same order of magnitude;

[0037] The tangent value is obtained by taking the quotient of the discharge voltage change value and the discharge capacity change value after the data normalization process.

[0038] In a possible implementation, when there are at least two batteries to be tested, screening the batteries to be tested according to the correlation to obtain a screening result includes:

[0039] Sorting at least two batteries to be tested according to the correlation to obtain a sorting sequence;

[0040] The at least two batteries to be tested are screened based on the sorting sequence to obtain the screening result.

[0041] In a possible implementation, before obtaining the discharge data of the battery to be tested within a preset voltage range, the method further includes:

[0042] Charging the battery to be tested, wherein the charging cut-off voltage is not less than the maximum value of the preset voltage range;

[0043] The battery to be tested is subjected to a discharge process, and discharge data of the battery to be tested during the discharge process is recorded.

[0044] In a possible implementation, the charging process of the battery to be tested includes:

[0045] Obtaining the open circuit voltage of the battery to be tested;

[0046] When the open circuit voltage is less than a first preset value, the battery to be tested is charged; wherein the first preset value is not less than a maximum value of the preset voltage range, and the charging cut-off voltage is greater than the first preset value.

[0047] In a possible implementation, the discharging process of the battery to be tested includes:

[0048] Obtaining the open circuit voltage of the battery to be tested;

[0049] When the open circuit voltage is not less than a first preset value, the battery to be tested is discharged, and discharge data of the battery to be tested during the discharge process is recorded; the first preset value is greater than the maximum value of the preset voltage range.

[0050] In a second aspect, the present application provides a battery screening device, the device comprising:

[0051] A determination module, used to determine the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested;

[0052] The screening module is used to screen the battery to be tested according to the correlation to obtain a screening result; the screening result is used to indicate whether the battery to be tested meets the requirements.

[0053] In a third aspect, the present application provides an electronic device, comprising a processor, and a memory communicatively connected to the processor;

[0054] The memory stores computer-executable instructions;

[0055] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0056] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0057] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the method described in any one of the first aspects.

[0058] The present application provides a battery screening method, device, electronic device and medium, wherein the battery screening method of the present application first determines the correlation between the discharge voltage and discharge capacity of the battery to be tested based on the discharge data of the battery to be tested. Then the battery to be tested is screened according to the obtained correlation to obtain a screening result. The data used by the present application method for screening is the discharge data of the battery to be tested, which can be obtained by discharging the battery to be tested. There is no need to go through a complex testing process, and there is no need to perform complex processing on the discharge data to achieve screening of the battery to be tested, thereby effectively reducing the complexity of the battery screening process, and thus facilitating efficient screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0060] Figure 1 A schematic diagram of an application scenario of a battery screening method provided in an embodiment of the present application;

[0061] Figure 2 A schematic diagram of a battery screening method provided in an embodiment of the present application Figure 1 ;

[0062] Figure 3A-Figure 3F A schematic diagram of discharge curves of different retired batteries of the same model provided in an embodiment of the present application;

[0063] Figure 4AA schematic diagram of partial discharge curves of different retired batteries of the same model provided in an embodiment of the present application;

[0064] Figure 4B A schematic diagram of capacity decay curves of different retired batteries of the same model provided in an embodiment of the present application;

[0065] Figure 5 A schematic diagram of a battery screening method provided in an embodiment of the present application Figure 2 ;

[0066] Figure 6 Schematic diagram 3 of a battery screening method provided in an embodiment of the present application;

[0067] Figure 7 Schematic diagram 4 of a battery screening method provided in an embodiment of the present application;

[0068] Fig. 8A Schematic diagram of partial discharge curves of different retired lithium iron phosphate batteries provided in the embodiment of the present application Figure 1 ;

[0069] Figure 8B Schematic diagram of partial discharge curves of different retired lithium iron phosphate batteries provided in the embodiment of the present application Figure 2 ;

[0070] Fig.9A A schematic diagram of target angle distribution of different retired lithium iron phosphate batteries provided in an embodiment of the present application;

[0071] Figure 9B-9D A comparison diagram for verifying a threshold value provided in an embodiment of the present application;

[0072] Fig.10 A schematic diagram of a battery screening method provided in an embodiment of the present application Figure 5 ;

[0073] Fig.11 A schematic diagram of the structure of a battery screening device provided in an embodiment of the present application;

[0074] Fig.12 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0075] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0076] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0077] After lithium-ion power batteries have been used for a period of time in high-performance applications such as electric vehicles, although their capacity and performance may no longer meet the original design requirements, they still retain considerable residual capacity and energy density. This makes retired batteries have the potential to be reused in areas with lower electrical performance requirements (such as energy storage systems, backup power supplies, and low-speed electric vehicles), thereby extending their service life and improving resource utilization efficiency.

[0078] However, since retired batteries have experienced different operating conditions (such as charge and discharge rates, temperature changes, number of cycles, etc.) during their service life, the degree of aging of these retired batteries will be seriously differentiated. At the same time, due to the large number of retired batteries and the numerous battery characteristic parameters, it is difficult to evaluate the comprehensive performance of the batteries. Therefore, in the stage of reorganization of retired batteries, in order to maximize the utilization value of retired batteries, it is necessary to identify and screen high-quality retired batteries to improve the performance of the reorganized products.

[0079] At present, a method for screening and classifying retired batteries is disclosed in the known technology, which method includes: collecting a comprehensive feature data set of the target battery, the comprehensive feature data set including: a decrease in the number of charge and discharge cycles, a shell deformation value, a static voltage measurement value, and a static current measurement value, etc.; then performing a K-means clustering analysis on the target battery based on the comprehensive feature data set, and outputting feature labels; and classifying the target battery based on the feature labels.

[0080] The above method has high requirements for the preparation of retired battery packs during service. It is necessary to install sensor components inside and outside the single battery. The sensor components include charge and discharge cycle sensors, shell deformation sensors and capacity sensors. It is not suitable for power battery packs that do not have such sensors installed. In addition, the comprehensive characteristic values ​​collected by this method need to rely on complete historical data, and can only be obtained after cleaning and analyzing the historical data. The historical data of power batteries during service is huge, and the processing process is cumbersome and time-consuming.

[0081] The known technology also discloses a method for screening retired lithium-ion batteries, which includes collecting battery data; selecting different kernel functions of the SVM model to analyze the battery data, and selecting hyperplanes through different kernel functions to classify the batteries; and fusing the battery classification results of the SVM models with different kernel functions based on the fuzzy membership model to obtain the final battery classification result.

[0082] In the above method, it is necessary to collect the complete charge and discharge curve of the battery, the stable discharge time of the reorganized battery pack, and the internal resistance of the battery cell before and after discharge. The data collection requires many tests and the sorting efficiency is low. In addition, the above method requires the construction of a single-core SVM model, and the model construction process and algorithm are complex.

[0083] A method for screening retired batteries is also disclosed in the known technology, which includes step I: appearance inspection; step II: voltage and internal resistance measurement; step III: dynamic screening, subjecting the batteries to be screened to charge and discharge tests, deriving the charge and discharge data, and obtaining an average voltage curve; according to the voltage deviation control, the curve is shifted upward to obtain an upper control line of the voltage deviation, and the curve is shifted downward to obtain a lower control line of the voltage deviation, and the battery whose voltage curve is within the upper control line and the lower control line is a qualified battery; step IV: after standing, grouping according to the newly measured static sorting data such as voltage and internal resistance.

[0084] In the above method, battery screening is achieved by measuring the dynamic and static parameters of the battery to be tested, but this method requires a complete charge and discharge test on the battery, and the sorting efficiency is low.

[0085] In summary, the known technologies have high requirements for battery data used to screen retired batteries, which need to be obtained through specific environments or specific tests, or even after complex processing, which makes the screening process more complicated and is not conducive to ensuring screening efficiency.

[0086] Therefore, the present application provides a battery screening method, device, electronic device and medium to solve the above problems. Specifically, the method of the present application uses the easily obtained discharge data of the battery to be tested to obtain the correlation between the discharge voltage and discharge capacity of the battery to be tested, and further screens the battery to be tested according to the correlation. The battery data used for screening in the method of the present application can be obtained after the discharge test, and the required data requirements are low, and no complex processing is required, which is conducive to ensuring the screening efficiency.

[0087] It is worth noting that the method of the present application is applicable to lithium batteries of any two-phase materials, such as lithium iron phosphate batteries, lithium manganese oxide batteries, etc.

[0088] It is understood that the method of the present application is applicable to any scenario involving battery screening. Figure 1 A schematic diagram of an application scenario of a battery screening method provided in an embodiment of the present application. Figure 1As shown, the method of the present application can be used in the retired battery recycling scenario, for screening each battery to be recycled, outputting the screening result of each battery to be tested, and the screening result is used to indicate whether the corresponding battery to be tested meets the recycling requirements. The method of the present application can also be used in the retired battery reorganization scenario, for screening multiple batteries to be reorganized, outputting the screening result of each battery to be tested, and the screening result is used to indicate whether the corresponding battery to be tested meets the reorganization requirements.

[0089] More specifically, Figure 1 As shown, for each scene, the electronic device obtains the discharge data corresponding to each battery to be tested in the scene, and determines the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data, and then screens the battery to be tested according to the correlation, obtains and outputs the screening result. It can be understood that Figure 1 In the retired battery recycling scenario shown in , there are a total of n batteries to be tested, and in the retired battery reorganization scenario, there are a total of x batteries to be tested.

[0090] In the above process, the discharge data is obtained by performing a discharge test on the battery to be tested. The discharge data can be obtained without the addition of complex sensors, and the electronic device determines the correlation between the discharge voltage and the discharge capacity based on the discharge data without the need for complex processing, thereby making the entire screening process more efficient and ensuring the screening efficiency.

[0091] In the following, some embodiments of the present application are described in detail in conjunction with the accompanying drawings. In the case where the embodiments do not conflict with each other, the following embodiments and features in the embodiments can be combined with each other.

[0092] Figure 2 A schematic diagram of a battery screening method provided in an embodiment of the present application Figure 1 ,like Figure 2 As shown, the method of this embodiment includes:

[0093] S201, determining a correlation between a discharge voltage and a discharge capacity of the battery to be tested according to discharge data of the battery to be tested.

[0094] The discharge data of the battery under test is obtained after the battery under test is subjected to a discharge process, and the specific discharge process is a constant current discharge process. More specifically, the discharge data includes the change of the discharge voltage of the battery under test over time during the discharge process, and the change of the discharge capacitance of the battery under test over time.

[0095] It should be understood that the battery voltage is the potential difference between the positive electrode and the negative electrode, and the battery is a basic property of matter. When the chemical reaction environment of the substance is determined, the potential of the substance is determined. When any component involved in the reaction changes, the potential of the substance will also change. For lithium-ion batteries, the battery consists of a positive electrode, a negative electrode, a separator, and an electrolyte. If any component changes, the battery voltage will also change. Therefore, the discharge curve of the battery can reflect the state of each substance inside the battery, and the state of the internal substance can reflect the quality of the battery performance.

[0096] In this embodiment, the correlation between the discharge voltage and the discharge capacity is at least used to indicate: the change of one of the discharge voltage and the discharge capacity relative to the other. The change of the discharge voltage relative to the discharge capacity, or the change of the discharge capacity relative to the discharge voltage, can be characterized by the discharge curve of the battery to be tested. Therefore, the correlation between the discharge voltage and the discharge capacity of the battery to be tested in this embodiment can be used to screen the batteries to be tested.

[0097] For example, for lithium iron phosphate batteries, their positive electrode materials have good stability and basically do not age during operation. Therefore, the aging of lithium iron phosphate batteries is mainly caused by electrolyte deficiency and negative electrode aging. Under the same current conditions, batteries with different aging degrees will show different voltage responses.

[0098] As an illustration, Figure 3A-Figure 3F A schematic diagram of discharge curves of different retired batteries of the same model provided in an embodiment of the present application. In the figure, discharge curves of different colors represent lithium iron phosphate batteries in different aging states. Figure 3A-Figure 3F A total of 12 discharge curves are shown, corresponding to 12 retired lithium iron phosphate batteries, cell1-cell12. It should be noted that the SOH of these 12 retired lithium iron phosphate batteries is the same. Figure 3A-Figure 3F As shown in the figure, the corresponding discharge curves of retired batteries with the same SOH are not the same, and the difference becomes more and more obvious as the battery SOH decreases.

[0099] S202, screening the batteries to be tested according to the correlation to obtain screening results.

[0100] Among them, the screening result is used to indicate whether the battery to be tested meets the requirements. It can be understood that the electronic device is configured with corresponding screening rules, and the electronic device screens the battery to be tested in combination with the screening rules and the correlation of the battery to be tested. Accordingly, whether the battery to be tested meets the requirements is whether the correlation of the battery to be tested meets the screening rules.

[0101] Specifically, the screening rules can be set by the user based on the screening requirements and input into the electronic device, or can be called by the electronic device based on the current application scenario, which is not limited in this embodiment. For example, when the method of the present application is applied to a battery recycling scenario, the electronic device obtains the screening rules corresponding to the scenario from the database, and screens the battery to be tested based on the correlation between the screening rules and the battery to be tested to obtain the screening results. It can be understood that at this time, the screening rules are used to screen the batteries to be tested that meet the recycling requirements.

[0102] In the method provided in this embodiment, the electronic device determines the correlation between the discharge voltage and the discharge capacity of the battery to be tested based on the easily obtained discharge data, and then screens the battery to be tested according to the correlation to obtain the screening result. The entire screening process does not involve a complex testing process, and there is no need to perform complex processing on the discharge data, and it can be used to screen the battery to be tested. Therefore, the method of this embodiment can reduce the complexity of the screening process, which is conducive to improving the screening efficiency.

[0103] Optionally, in a preferred embodiment, the electronic device specifically obtains discharge data of the battery to be tested within a preset voltage range, and determines a correlation between the discharge voltage and the discharge capacity of the battery to be tested within the preset voltage range according to the discharge data.

[0104] The preset voltage range is determined by the voltage stable region corresponding to the battery to be tested. It should be understood that when the battery is discharged to the voltage stable region, the discharge voltage is maintained at a relatively constant level.

[0105] More specifically, in one possible implementation, the maximum value of the preset voltage range is less than the minimum value of the voltage stable zone corresponding to the battery to be tested. It is understandable that in actual applications, the maximum value of the preset voltage range may also be equal to the minimum value of the voltage stable zone, which is not limited in this embodiment.

[0106] As an illustration, Figure 4A A schematic diagram of partial discharge curves of different retired batteries of the same model provided in an embodiment of the present application, Figure 4B A schematic diagram of capacity decay curves of different retired batteries of the same model provided in an embodiment of the present application.

[0107] in, Figure 4A Intercepted Figure 3A The discharge curves of the two retired lithium iron phosphate batteries are shown in Figure 1. Specifically, the discharge curves within the preset voltage range are intercepted. Figure 4A As shown, the preset voltage range in this example is 3.1-2.7V, wherein 3.1V is less than the minimum value of the voltage stable zone, and 2.7V is the discharge cut-off voltage of the retired lithium iron phosphate battery in this example.

[0108] Depend on Figure 4A It can be seen that within the same preset voltage range, two retired lithium iron phosphate batteries with the same SOH and different aging states correspond to different discharge capacity change values. Specifically, the discharge voltage change of cell 1, which has a larger discharge capacity change value, is delayed, which indicates that the phase transition of the positive and negative materials of the retired lithium iron phosphate battery becomes disordered or uneven. Correspondingly, Figure 4B As shown, cell 1 with a larger discharge capacity change value has lower long cycle stability and a larger cycle decay rate, which means that cell 1 is inferior to cell 2. Therefore, the discharge data within the preset voltage range can be used to obtain a correlation and use it for screening the batteries to be tested.

[0109] It is worth mentioning that Figure 4A and Figure 4B Angle α and angle β are marked in the figure, where angle α is used to represent the angle obtained by the tangent value of the discharge voltage change value and the discharge capacity change value of cell2 within the preset voltage range. Angle β is used to represent the angle obtained by the tangent value of the discharge voltage change value and the discharge capacity change value of cell1 within the preset voltage range. It can be understood that this angle can be used as the correlation between the discharge voltage and discharge capacity of the battery to be tested within the preset voltage range. Figure 4B It can be seen that the cell 2 with a larger angle is of higher quality than the cell 1 with a smaller angle. Therefore, when the angle is used as a correlation, the larger the angle value, the higher the quality of the corresponding battery.

[0110] Optionally, in actual applications, the minimum value of the preset voltage range may also be greater than the maximum value of the voltage plateau zone. The electronic device determines the correlation between the discharge voltage and the discharge capacity of the battery to be tested within the preset voltage range based on the discharge data within the preset voltage range, and then determines the screening result according to the correlation and the configured screening rules.

[0111] In the above process, the electronic device determines the correlation of the battery to be tested through the discharge data within the preset voltage range, rather than determining the correlation of the battery to be tested based on the entire discharge data of the battery to be tested, which effectively reduces the amount of calculation, thereby facilitating the improvement of screening efficiency. Furthermore, the preset voltage range is determined through the voltage plateau, and the maximum value of the preset voltage range is made smaller than the minimum value of the voltage plateau, which can further reduce the amount of calculation on the one hand, and help ensure the accuracy of screening on the other hand.

[0112] It is understandable that, in practical applications, the preset voltage range may also include the complete discharge data of the battery to be tested, and the electronic device determines the discharge curve of the battery to be tested based on the complete discharge data of the battery to be tested, and then screens the battery to be tested according to the discharge curve. Specifically, the screening rule can be used to indicate the preset discharge curve, and the electronic device determines the screening result of the battery to be tested by comparing the similarity between the preset discharge curve and the discharge curve of the battery to be tested. In this embodiment, the preset voltage range is not limited, as long as the screening can be achieved based on the discharge data within the preset voltage range.

[0113] Based on the aforementioned embodiments, as a design, the present application further provides an embodiment of determining a correlation and screening batteries to be tested according to the correlation.

[0114] Specifically, Figure 5 A schematic diagram of a battery screening method provided in an embodiment of the present application Figure 2 ,like Figure 5 As shown, the method of this embodiment includes:

[0115] S501, calculating a discharge capacity change value within a target voltage range as a correlation relationship according to discharge data of a battery to be tested within a preset voltage range.

[0116] Among them, the target voltage range belongs to the preset voltage range.

[0117] In this embodiment, the electronic device further selects a target voltage range based on the preset voltage range, and determines the discharge capacity change value within the target voltage range as the correlation according to the discharge data within the target voltage range.

[0118] Specifically, the electronic device can first determine the discharge data within the target voltage range based on the discharge data within the preset voltage range. Further, the electronic device determines the time range corresponding to the endpoint voltage of the target voltage range, and then determines the corresponding two endpoint capacities based on the time range from the change of the discharge capacity of the battery to be tested within the preset voltage range along the time change, and finally obtains the discharge capacity change value by subtracting the two endpoint capacities.

[0119] Optionally, in practical applications, the electronic device may first generate a partial discharge curve of the battery to be tested within a preset voltage range based on the discharge data within the preset voltage range. Further, according to the partial discharge curve, the two end point capacities corresponding to the target voltage range are intercepted to obtain the discharge capacity change value.

[0120] It can be understood that the target voltage range may be smaller than the preset voltage range, or may be equal to the preset voltage range, as long as it does not exceed the preset voltage range, which is not limited in this embodiment.

[0121] For example, for Figure 4A For the cell 1 shown, if the target voltage range is 3.1-2.7V, the corresponding discharge capacity change value is 45.5Ah. The discharge capacity change value 45.5Ah corresponding to the target voltage range 3.1-2.7V is used as the correlation relationship of the battery to be tested.

[0122] S502: If the discharge capacity change value is not greater than the preset capacity change value, it is determined that the screening result of the battery to be tested meets the requirement.

[0123] S503: If the discharge capacity change value is greater than the preset capacity change value, it is determined that the screening result of the battery to be tested does not meet the requirements.

[0124] In this embodiment, a preset capacity change value is configured in the electronic device. When the discharge capacity change value of the battery to be tested within the target voltage range is used as a correlation, the electronic device compares the discharge capacity change value indicated by the correlation with the preset capacity change value to determine whether the screening result of the battery to be tested indicates that the battery to be tested meets the requirements.

[0125] It should be understood that Figure 4A and Figure 4B It can be seen that when the target voltage range is fixed, the smaller the corresponding discharge capacity change value is, the better the corresponding battery is. Therefore, in this embodiment, the battery to be tested whose discharge capacity change value is less than or equal to the preset capacity change value is considered to meet the requirements as a screening rule.

[0126] Specifically, in this embodiment, the preset capacity change value is determined according to the specific needs of the scenario. For example, for a lithium battery recycling scenario, the discharge curve of the battery in the worst aging state to be recycled is determined, and the discharge capacity change value corresponding to the target voltage range is further determined according to the discharge curve as the preset capacity change value.

[0127] Through the above process, when the electronic device screens the batteries to be tested based on the correlation, it only needs to compare the discharge capacity change value of the target voltage range of the battery to be tested with the preset capacity change value to obtain the screening result. The process is simple and does not involve complicated data processing, which is conducive to ensuring the screening efficiency.

[0128] As another design, the present application also provides an embodiment for determining a correlation and screening batteries to be tested according to the correlation.

[0129] Specifically, Figure 6 A flow chart of a battery screening method provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the method of this embodiment includes:

[0130] S601, calculating a discharge voltage change value within a target capacity range as a correlation relationship according to discharge data of a battery to be tested within a preset voltage range.

[0131] Among them, the target capacity range belongs to the preset capacity range corresponding to the preset voltage range.

[0132] It is understandable that when the preset voltage range is known, the corresponding preset capacity range can be determined based on the discharge data of the battery to be tested.

[0133] In this embodiment, the electronic device further selects a target capacity range based on the preset capacity range, and determines the discharge voltage change value within the target capacity range as the correlation according to the discharge data within the target capacity range.

[0134] Specifically, the electronic device can first determine the discharge data within the target capacity range based on the discharge data within the preset capacity range. Further, the electronic device determines the time range corresponding to the endpoint capacity of the target capacity range, and then determines the two corresponding endpoint voltages based on the time range from the change of the discharge voltage of the battery to be tested within the preset capacity range along the time change, and finally obtains the discharge voltage change value by taking the difference between the two endpoint voltages.

[0135] Optionally, in practical applications, the electronic device may first generate a partial discharge curve of the battery to be tested within a preset capacity range based on the discharge data within the preset capacity range. Further, according to the partial discharge curve, two end point voltages corresponding to the target capacity range are intercepted to obtain the discharge voltage change value.

[0136] It can be understood that the target capacity range may be smaller than the preset capacity range, or may be equal to the preset capacity range, as long as it does not exceed the preset capacity range, which is not limited in this embodiment.

[0137] S602: If the discharge voltage change value is less than the preset voltage change value, it is determined that the screening result of the battery to be tested does not meet the requirements.

[0138] S603: If the discharge voltage change value is not less than the preset voltage change value, it is determined that the screening result of the battery to be tested meets the requirement.

[0139] In this embodiment, a preset voltage change value is configured in the electronic device. When the discharge voltage change value of the battery to be tested within the target capacity range is used as a correlation, the electronic device compares the discharge voltage change value indicated by the correlation with the preset voltage change value to determine whether the screening result of the battery to be tested indicates that the battery to be tested meets the requirements.

[0140] It should be understood that Figure 4A and Figure 4BIt can be seen that when the target capacity range is fixed, the larger the corresponding discharge voltage change value is, the better the corresponding battery is. Therefore, in this embodiment, the battery to be tested whose discharge voltage change value is less than the preset voltage change value is considered as not meeting the requirements as a screening rule.

[0141] Specifically, in this embodiment, the preset voltage change value is also determined according to the specific requirements of the scene. For details, please refer to the description of the preset capacity change value in the above embodiment, which will not be repeated here.

[0142] Through the above process, when the electronic device screens the batteries to be tested based on the correlation, it only needs to compare the discharge voltage change value of the target capacity range of the battery to be tested with the preset voltage change value to obtain the screening result. The process is simple and does not involve complicated data processing, which is conducive to ensuring the screening efficiency.

[0143] As another design, the present application also provides an embodiment for determining a correlation and screening batteries to be tested according to the correlation.

[0144] Specifically, Figure 7 A flowchart of a battery screening method provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, the method of this embodiment includes:

[0145] S701, based on the discharge data of the battery to be tested within a preset voltage range, calculate the discharge voltage change value within the target capacity range, and the discharge capacity change value corresponding to the target capacity range; or calculate the discharge capacity change value within the target voltage range, and the discharge voltage change value corresponding to the target voltage range.

[0146] Among them, the target capacity range belongs to the preset capacity range corresponding to the preset voltage range; the target voltage range belongs to the preset voltage range.

[0147] In this embodiment, two methods for determining the discharge capacity change value and the discharge voltage change value are provided. Specifically, the electronic device generates a partial discharge curve of the battery to be tested based on the discharge data of the battery to be tested within a preset voltage range, and further, when the target voltage range or the target capacity range is known, the discharge data of the target voltage range or the target capacity range is intercepted from the partial discharge curve, and the corresponding discharge capacity change value and the discharge voltage change value are obtained.

[0148] As a preferred implementation, in order to further reduce the amount of calculation, when calculating the discharge capacity change value and the discharge voltage change value based on the target voltage range, the target voltage range can be made smaller than the preset voltage range. When calculating the discharge voltage change value and the discharge capacity change value based on the target capacity range, the target capacity range can be made smaller than the preset capacity range.

[0149] It can be understood that the target voltage range and target capacity range can be input by the user or randomly generated by the electronic device. This is not limited in the present embodiment, as long as the target voltage range belongs to the preset voltage range and the target capacity range belongs to the preset capacity range corresponding to the preset voltage range.

[0150] As an example, Fig. 8A Schematic diagram of partial discharge curves of different retired lithium iron phosphate batteries provided in the embodiment of the present application Figure 1 It should be understood that Fig. 8A The two batteries shown, cell1 and cell2, correspond to Figure 4A and Figure 4B As shown in cell1 and cell2. Fig. 8A As shown in FIG. 1 , if the target capacity range is 5-17.6Ah, the discharge curve within the range of 5-17.6Ah is intercepted from the partial discharge curve. Based on the discharge curve within this range, the discharge voltage change value and the discharge capacity change value within the target capacity range can be calculated. Fig. 8A The discharge voltage change value of cell1 in the figure is the value indicated by ①, which is 0.075V. Fig. 8A For cell2 in the figure, the discharge voltage change value is the value indicated by ② in the figure, which is 0.345V. The corresponding discharge capacity changes of cell1 and cell2 are both 12.8Ah.

[0151] As another example, Figure 8B Schematic diagram of partial discharge curves of different retired lithium iron phosphate batteries provided in the embodiment of the present application Figure 2 It should be understood that Fig. 8A The two batteries shown, cell1 and cell2, correspond to Figure 4A and Figure 4B As shown in cell1 and cell2. Figure 8B As shown in FIG. 1 , if the target voltage range is 3.0-2.8V, the discharge curve within the range of 3.0-2.8V is intercepted from the partial discharge curve. Based on the discharge curve within this range, the discharge capacity change value and the discharge voltage change value within the target voltage range can be calculated. Figure 8B The discharge capacity change value of cell1 in the figure is the value indicated by ①, which is 22.6Ah. Figure 8B For cell2 in the figure, the discharge capacity change value is the value indicated by ② in the figure, which is 6.95Ah. The discharge voltage changes corresponding to cell1 and cell2 are both 0.2V.

[0152] S702, calculating a tangent value according to the discharge voltage change value and the discharge capacity change value, and taking a target angle corresponding to the tangent value as a correlation relationship.

[0153] In this embodiment, the electronic device calculates the tangent value based on the obtained discharge voltage change value and discharge capacity change value. It can be understood that when the discharge voltage change value or the discharge capacity change value is used as the dividend, different tangent values ​​can be obtained, corresponding to different target angles, and different target angles can be used as correlations. For example, when the discharge voltage change value is used as the dividend, the target angle obtained is Fig. 8A and Figure 8B The angles α and β are shown.

[0154] In this embodiment, the target angle corresponding to the tangent value is used as a correlation to screen the batteries to be tested, which helps the user to intuitively deduce the shape of the discharge curve of the battery to be tested based on the target angle, so as to more intuitively understand the aging state of the battery to be tested.

[0155] In a possible implementation, when calculating the tangent value, the electronic device first performs data normalization processing on the discharge voltage change value and the discharge capacity change value so that the discharge voltage change value and the discharge capacity change value have the same order of magnitude. Further, the discharge voltage change value and the discharge capacity change value after the data normalization processing are divided to obtain the tangent value.

[0156] For example, Figure 8B As shown in cell1 and cell2, the electronic device performs data normalization processing on the discharge voltage change value and the discharge capacity change value so that the discharge voltage change value and the discharge capacity change value are in the same order of magnitude. Specifically, the discharge voltage change value is 20V after processing, and the order of magnitude of the discharge capacity change value remains unchanged.

[0157] Furthermore, the electronic device obtains corresponding tangent values ​​based on the processed discharge voltage change value 20V and the corresponding discharge capacity change value. When the discharge voltage change value is used as the dividend, the tangent value of cell1 is about 0.88, and the tangent value of cell2 is about 2.88. Accordingly, the target angle of cell1 is about 41.5°, and the target angle of cell2 is about 70.84°.

[0158] In the above process, by performing data standardization processing on the discharge voltage change value and the discharge capacity change value, the calculation result can be made more accurate and the comparison between the target angles can be made more obvious.

[0159] S703, when the tangent value is the ratio of the discharge voltage change value to the discharge capacity change value, if the target angle is less than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements; if the target angle is not less than the preset angle, it is determined that the screening result of the battery to be tested meets the requirements.

[0160] S704, when the tangent value is the ratio of the discharge capacity change value to the discharge voltage change value, if the target angle is not greater than the preset angle, it is determined that the screening result of the battery to be tested meets the requirements; if the target angle is greater than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements.

[0161] It is understandable that when calculating the tangent value, different dividends are selected, and the corresponding tangent angles are different, and the corresponding screening rules should be opposite. Therefore, in this embodiment, when the target angle is used as the correlation relationship, Figure 4A and Figure 4B It can be seen that there are two specific situations:

[0162] In the first case, the tangent value is calculated by taking the discharge voltage change value as the dividend, and if the obtained target angle is less than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements. Otherwise, it is determined that the screening result of the battery to be tested meets the requirements.

[0163] In the second case, the tangent value is calculated by taking the discharge capacity change value as the dividend, and if the obtained target angle is less than or equal to the preset angle, it is determined that the screening result of the battery to be tested meets the requirements. Otherwise, it is determined that the screening result of the battery to be tested meets the requirements.

[0164] As an illustration, Figure 4A and Figure 4B It can be seen that when the discharge voltage change value is used as the dividend to calculate the tangent value, Figure 8B As shown in cell 1 and cell 2, the target angle of cell 1 is about 41.5°, and the target angle of cell 2 is about 70.84°. Cell 2 with a larger target angle is of higher quality.

[0165] When the tangent value is calculated by taking the discharge capacity change value as the dividend, Figure 8B As shown in cell 1 and cell 2, the target angle of cell 1 is about 48.5°, and the target angle of cell 2 is about 19.16°. Cell 2 with a smaller target angle is of higher quality.

[0166] In this embodiment, for the first case mentioned above, when the tangent value is calculated by taking the discharge voltage change value as the dividend, the preset angle can be determined by the following process:

[0167] First, 216 retired lithium iron phosphate batteries with different SOH were randomly selected, and their target angles within the preset voltage range were calculated. Specifically, Fig.9AA schematic diagram of the target angle distribution of different retired lithium iron phosphate batteries provided in an embodiment of the present application. The data points shown in the figure correspond to the target angles of 216 retired lithium iron phosphate batteries within a preset voltage range, and the curve is used to represent the distribution of the target angles of 216 retired lithium iron phosphate batteries within the preset voltage range. In addition, the upper edge of the box in the box plot in the figure is used to represent the first quartile, and the data above the upper edge of the box accounts for 25% of the total data; the lower edge of the box is used to represent the third quartile, and the data above the upper edge of the box accounts for 75% of the total data, and the dotted line in the box is the median of all data. Fig.9A As shown, when the target angle is less than the third quartile of the box plot, 58°, the battery distribution begins to become discrete.

[0168] Furthermore, Figure 9B-9D A comparison diagram for verifying a threshold value provided in an embodiment of the present application. Specifically, in this embodiment, two groups of batteries are selected for threshold verification. Fig. 9B Specifically, the discharge curve comparison of the two groups of batteries is shown below. Fig. 9C Specifically, it is a comparison chart of partial discharge curves of two groups of batteries within the preset voltage range. Fig.9D Specifically, it is a comparison chart of the capacity decay curves of the two groups of batteries.

[0169] More specifically, Figure 9B-9D As shown, the first group of batteries includes five retired lithium iron phosphate batteries, namely, sample 1, sample 2, sample 3, sample 4, and sample 5, and the second group of batteries includes five retired lithium iron phosphate batteries, namely, sample 6, sample 7, sample 8, sample 9, and sample 10. Among them, the target angles of the retired lithium iron phosphate batteries in the first group are all greater than 58°, and the target angles of the retired lithium iron phosphate batteries in the second group are all less than 58°. Fig.9D It can be seen that the long cycle decay rate of the first group of batteries is smaller than the long cycle decay rate of the second group of batteries. Therefore, in this embodiment, the preset angle can be set to 58° as a threshold for determining whether the battery to be tested is of high quality.

[0170] Similarly, in the embodiments of the present application, when determining the preset capacity change value and the preset voltage change value, the above process can be used to determine the preset capacity change value and the preset voltage change value, which will not be described in detail here.

[0171] In addition, the present application also provides an embodiment for explaining in detail how to obtain discharge data within a preset voltage range. Specifically, Fig.10 A schematic diagram of a battery screening method provided in an embodiment of the present application Figure 5 ,like Fig.10 As shown, the method of this embodiment includes:

[0172] S1001, charging the battery to be tested, and the charging cut-off voltage is not less than the maximum value of a preset voltage range.

[0173] S1002, performing discharge processing on the battery to be tested, and recording discharge data of the battery to be tested during the discharge process.

[0174] Specifically, in this embodiment, the battery under test is charged by constant current charging, and the charging cut-off voltage is not less than the maximum value of the preset voltage range. The battery under test is discharged by constant current discharging, and the discharge data during the discharge process is recorded.

[0175] In this embodiment, before discharging the battery to be tested to obtain discharge data, the battery to be tested is first charged and the charging cut-off voltage is not less than the maximum value of the preset voltage range, so as to ensure that the electronic device can obtain complete discharge data within the preset voltage range.

[0176] In a preferred embodiment, the electronic device first obtains the open circuit voltage of the battery to be tested, and only charges the battery to be tested when the open circuit voltage is less than a first preset value. When the open circuit voltage is not less than the first preset value, the battery to be tested is discharged, and the discharge data of the battery to be tested during the discharge process is recorded. The first preset value is not less than the maximum value of the preset voltage range, and the charging cut-off voltage is greater than the first preset value.

[0177] In this embodiment, before charging the battery to be tested, the electronic device first determines whether the open circuit voltage of the battery to be tested is not less than a first preset value, and makes the first preset value not less than the maximum value of the preset voltage range. Based on this, if the battery to be tested is less than the first preset value, the battery to be tested is charged, and the charging cut-off voltage is greater than the first preset value.

[0178] It can be understood that if the battery to be tested is not less than the first preset value, the battery to be tested is directly discharged.

[0179] Through the above content, under the premise of ensuring that the electronic device can obtain complete discharge data within the preset range, the first preset value is not less than the maximum value of the preset voltage range, and the charging cut-off voltage is greater than the first preset value, rather than fully charging the battery to be tested, which is beneficial to ensure the performance of the battery to be tested.

[0180] In a preferred embodiment, the first preset value is slightly larger than the maximum value of the preset voltage range. For example, if the maximum value of the preset voltage range is 3.1V, the first preset value can be configured as 3.2V. Accordingly, the voltage cutoff voltage can be 3.3V, so as to ensure that the complete discharge data within the preset voltage range can be obtained, and at the same time, slow charging of the battery to be tested can be avoided, so as to ensure the performance of the battery to be tested.

[0181] S1003, obtaining discharge data within a preset voltage range, and determining, according to the discharge data, a correlation between the discharge voltage and the discharge capacity of the battery to be tested within the preset voltage range.

[0182] Specifically, the correlation relationship may be any one of the aforementioned embodiments, which will not be described in detail here.

[0183] S1004, when there is only one battery to be tested, determining the screening result of the battery to be tested according to the correlation relationship.

[0184] In this embodiment, when the electronic device screens a battery to be tested, the screening result of the battery to be tested is determined based on the correlation and the corresponding screening rules. The specific process can be referred to in the above embodiment, which will not be described here.

[0185] S1005, when there are at least two batteries to be tested, sort the at least two batteries to be tested according to the correlation relationship to obtain a sorting sequence.

[0186] S1006, screening at least two batteries to be tested based on the sorting sequence to obtain a screening result.

[0187] In this embodiment, when the electronic device screens at least two batteries to be tested, it first sorts the at least two batteries to be tested based on the correlation, which can be the discharge capacity change value within the target voltage range, the discharge voltage change value within the target capacity range, or the target angle, to obtain a sorting sequence. Specifically, the at least two batteries to be tested are sorted according to the discharge capacity change value, the discharge voltage change value, or the target angle to obtain a sorting sequence.

[0188] Based on this, when the electronic device screens at least two batteries to be tested, it can screen the batteries to be tested in accordance with the screening rules in the order indicated by the sorting sequence to determine the screening results. Specifically, if the screening rule is used to indicate that the value corresponding to the correlation should be less than the threshold value corresponding to the correlation, the electronic device compares the value indicated by the correlation of the batteries to be tested with the corresponding threshold value in accordance with the screening rule to determine the screening results of the batteries to be tested.

[0189] It is understandable that when the correlation of any battery to be tested indicates that it does not meet the screening rules, the batteries to be tested located after the battery to be tested in the sorting sequence do not need to be screened based on the correlation, and their corresponding screening results can be directly determined to indicate that they do not meet the requirements.

[0190] Through the above settings, on the one hand, time can be effectively saved, and on the other hand, computing power can be effectively saved, which is beneficial to improving screening efficiency.

[0191] In addition, for some scenarios, such as battery reorganization scenarios, assuming that the discharge voltage change value is used as the correlation, the screening rule is used to indicate that the battery to be tested whose discharge voltage change value is ranked within a preset range among at least two batteries to be tested is a battery to be tested that meets the requirements. On this basis, the electronic device first sorts the at least two batteries to be tested based on the correlation to obtain a sorting sequence, and based on the sorting sequence, it can more intuitively and quickly screen the battery to be tested that meets the requirements among the at least two batteries to be tested to obtain a screening result.

[0192] From the foregoing, it can be seen that the battery screening method provided in the embodiment of the present application, compared with the known technology, on the one hand, does not require a large amount of charge and discharge data, or relies on data obtained from pre-installed sensors or even complex test environments, and on the other hand, does not require complex processing of huge amounts of data, but only performs simple subtraction or division based on the discharge data of the battery to be tested within a preset voltage range, and then compares it with the preset value to achieve screening. Therefore, the battery screening method provided in the embodiment of the present application has the advantages of lower cost, stronger applicability, and higher efficiency compared with the known technology.

[0193] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0194] It should be further noted that, although the various steps in the flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowchart may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-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 the sub-steps or stages of other steps.

[0195] The above-mentioned embodiments introduce a battery screening method from the perspective of method flow, and the following embodiments introduce a battery screening device from the perspective of a virtual module or a virtual unit. For details, please refer to the following embodiments.

[0196] The present application embodiment provides a battery screening device, Fig.11 A schematic diagram of the structure of a battery screening device provided in an embodiment of the present application is shown in FIG. Fig.11 As shown, the device comprises:

[0197] A determination module 111, configured to determine a correlation between a discharge voltage and a discharge capacity of the battery to be tested according to the discharge data of the battery to be tested;

[0198] The screening module 112 is used to screen the battery to be tested according to the correlation relationship to obtain a screening result; the screening result is used to indicate whether the battery to be tested meets the requirements.

[0199] In a possible implementation of the embodiment of the present application, the determination module 111 is specifically configured to:

[0200] Obtaining discharge data of the battery to be tested within a preset voltage range, and determining, based on the discharge data, a correlation between the discharge voltage and the discharge capacity of the battery to be tested within the preset voltage range;

[0201] The preset voltage range is determined by the voltage stable region corresponding to the battery to be tested.

[0202] In a possible implementation of the embodiment of the present application, the maximum value of the preset voltage range is smaller than the minimum value of the voltage stable region corresponding to the battery to be tested.

[0203] In a possible implementation of the embodiment of the present application, the discharge data includes a change in the discharge voltage of the battery to be tested over time, and a change in the discharge capacity of the battery to be tested over time;

[0204] The correlation is at least used to indicate a change in one of the discharge voltage and the discharge capacity relative to the other.

[0205] In a possible implementation of the embodiment of the present application, the determination module 111 is specifically configured to:

[0206] According to the discharge data of the battery to be tested within the preset voltage range, the discharge capacity change value within the target voltage range is calculated as a correlation relationship;

[0207] Among them, the target voltage range belongs to the preset voltage range.

[0208] In a possible implementation of the embodiment of the present application, the screening module 112 is specifically used for:

[0209] If the discharge capacity change value is not greater than the preset capacity change value, it is determined that the screening result of the battery to be tested meets the requirements; and / or,

[0210] If the discharge capacity change value is greater than the preset capacity change value, it is determined that the screening result of the battery to be tested does not meet the requirements.

[0211] In a possible implementation of the embodiment of the present application, the determination module 111 is specifically configured to:

[0212] According to the discharge data of the battery to be tested within the preset voltage range, the discharge voltage change value within the target capacity range is calculated as a correlation; wherein the target capacity range belongs to the preset capacity range corresponding to the preset voltage range.

[0213] In a possible implementation of the embodiment of the present application, the screening module 112 is specifically used for:

[0214] If the discharge voltage change value is less than the preset voltage change value, it is determined that the screening result of the battery to be tested does not meet the requirements; and / or,

[0215] If the discharge voltage change value is not less than the preset voltage change value, it is determined that the screening result of the battery to be tested meets the requirements.

[0216] In a possible implementation of the embodiment of the present application, the determination module 111 is specifically configured to:

[0217] According to the discharge data of the battery to be tested within the preset voltage range, the discharge voltage change value within the target capacity range and the discharge capacity change value corresponding to the target capacity range are calculated; or, the discharge capacity change value within the target voltage range and the discharge voltage change value within the target voltage range are calculated; wherein the target capacity range belongs to the preset capacity range corresponding to the preset voltage range;

[0218] The tangent value is calculated according to the discharge voltage change value and the discharge capacity change value, and the target angle corresponding to the tangent value is used as a correlation relationship.

[0219] In a possible implementation of the embodiment of the present application, the screening module 112 is specifically used for:

[0220] When the tangent value is the ratio of the discharge voltage change value to the discharge capacity change value, if the target angle is less than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements; and / or,

[0221] If the target angle is not less than the preset angle, it is determined that the screening result of the battery to be tested meets the requirements.

[0222] In a possible implementation of the embodiment of the present application, the screening module 112 is specifically used for:

[0223] When the tangent value is the ratio of the discharge capacity change value to the discharge voltage change value, if the target angle is not greater than the preset angle, it is determined that the screening result of the battery to be tested meets the requirements; and / or,

[0224] If the target angle is greater than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements.

[0225] In a possible implementation of the embodiment of the present application, the determination module 111 is specifically configured to:

[0226] Performing data standardization processing on the discharge voltage change value and the discharge capacity change value so that the discharge voltage change value and the discharge capacity change value have the same order of magnitude;

[0227] The tangent value is obtained by taking the quotient of the discharge voltage change value and the discharge capacity change value after the data standardization processing.

[0228] In a possible implementation of the embodiment of the present application, the screening module 112 is specifically used for:

[0229] When there are at least two batteries to be tested, the at least two batteries to be tested are sorted according to the correlation relationship to obtain a sorted sequence;

[0230] At least two batteries to be tested are screened based on the sorted sequence to obtain a screening result.

[0231] In a possible implementation of the embodiment of the present application, the determining module 111 is further configured to:

[0232] The battery to be tested is charged, and the charging cut-off voltage is not less than the maximum value of the preset voltage range;

[0233] The battery to be tested is discharged, and the discharge data of the battery to be tested during the discharge process is recorded.

[0234] In a possible implementation of the embodiment of the present application, the determination module 111 is specifically configured to:

[0235] Obtain the open circuit voltage of the battery to be tested;

[0236] When the open circuit voltage is less than a first preset value, the battery to be tested is charged; wherein the first preset value is not less than a maximum value of a preset voltage range, and the charging cut-off voltage is greater than the first preset value.

[0237] In a possible implementation of the embodiment of the present application, the determination module 111 is specifically configured to:

[0238] Obtain the open circuit voltage of the battery to be tested;

[0239] When the open circuit voltage is not less than a first preset value, the battery to be tested is discharged, and discharge data of the battery to be tested during the discharge process is recorded; the first preset value is greater than the maximum value of the preset voltage range.

[0240] It should be understood that the above-mentioned device embodiments are only illustrative, and the device of the present application can also be implemented in other ways. For example, the division of units / modules in the above-mentioned embodiments is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units, modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed.

[0241] An electronic device is provided in an embodiment of the present application. Fig.12 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown in FIG. Fig.12 As shown, Fig.12 The electronic device shown includes: a processor 121 and a memory 122. The processor 121 and the memory 122 are connected, such as through a bus 123. Optionally, the electronic device may further include a transceiver 124. It should be noted that in actual applications, the transceiver 124 is not limited to one, and the structure of the electronic device does not constitute a limitation on the embodiments of the present application.

[0242] The processor 121 may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor 121 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0243] The bus 123 may include a path to transmit information between the above components. The bus 123 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus 123 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.12 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0244] The memory 122 can be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited to these.

[0245] The memory 122 is used to store application code for executing the solution of the present application, and the execution is controlled by the processor 121. The processor 121 is used to execute the application code stored in the memory 122 to implement the contents shown in the above method embodiment.

[0246] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used to implement the service message processing methods in the above-mentioned embodiments.

[0247] A computer program product is also provided in an embodiment of the present application, including a computer program. When the computer program is executed by a processor, the technical solution of the above-mentioned method embodiment is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0248] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0249] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0250] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery screening method, characterized in that: The method comprises: Determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested; The battery to be tested is screened according to the correlation to obtain a screening result; the screening result is used to indicate whether the battery to be tested meets the requirements.

2. The method according to claim 1, characterized in that The step of determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes: Acquire discharge data of the battery to be tested within a preset voltage range, and determine, based on the discharge data, a correlation between the discharge voltage and the discharge capacity of the battery to be tested within the preset voltage range; Wherein, the preset voltage range is determined by the voltage stable region corresponding to the battery to be tested.

3. The method according to claim 2, characterized in that The maximum value of the preset voltage range is smaller than the minimum value of the voltage stable region corresponding to the battery to be tested.

4. The method according to any one of claims 1 to 3, characterized in that: The discharge data includes the change of the discharge voltage of the battery to be tested over time, and the change of the discharge capacity of the battery to be tested over time; The correlation is at least used to indicate: a change in one of the discharge voltage and the discharge capacity relative to the other.

5. The method according to any one of claims 1 to 3, characterized in that: The step of determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes: According to the discharge data of the battery to be tested within a preset voltage range, calculating the discharge capacity change value within a target voltage range as the correlation; Wherein, the target voltage range belongs to the preset voltage range.

6. The method according to claim 5, characterized in that The step of screening the battery to be tested according to the correlation to obtain a screening result includes: If the discharge capacity change value is not greater than the preset capacity change value, it is determined that the screening result of the battery to be tested meets the requirements; and / or, If the discharge capacity change value is greater than the preset capacity change value, it is determined that the screening result of the battery to be tested does not meet the requirements.

7. The method according to any one of claims 1 to 3, characterized in that: The step of determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes: According to the discharge data of the battery to be tested within a preset voltage range, a discharge voltage change value within a target capacity range is calculated as the correlation; wherein the target capacity range belongs to a preset capacity range corresponding to the preset voltage range.

8. The method according to claim 7, characterized in that The step of screening the battery to be tested according to the correlation to obtain a screening result includes: If the discharge voltage change value is less than the preset voltage change value, it is determined that the screening result of the battery to be tested does not meet the requirements; and / or, If the discharge voltage change value is not less than the preset voltage change value, it is determined that the screening result of the battery to be tested meets the requirement.

9. The method according to any one of claims 1 to 3, characterized in that: The step of determining the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested includes: According to the discharge data of the battery to be tested within the preset voltage range, the discharge voltage change value within the target capacity range and the discharge capacity change value corresponding to the target capacity range are calculated; or, the discharge capacity change value within the target voltage range and the discharge voltage change value within the target voltage range are calculated; wherein the target capacity range belongs to the preset capacity range corresponding to the preset voltage range; A tangent value is calculated according to the discharge voltage change value and the discharge capacity change value, and a target angle corresponding to the tangent value is used as the correlation.

10. The method according to claim 9, characterized in that When the tangent value is the ratio of the discharge voltage change value to the discharge capacity change value, screening the battery to be tested according to the correlation to obtain a screening result includes: If the target angle is less than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements; and / or, If the target angle is not less than the preset angle, it is determined that the screening result of the battery to be tested meets the requirement.

11. The method according to claim 9, characterized in that When the tangent value is the ratio of the discharge capacity change value to the discharge voltage change value, screening the battery to be tested according to the correlation to obtain a screening result includes: If the target angle is not greater than the preset angle, it is determined that the screening result of the battery to be tested meets the requirements; and / or, If the target angle is greater than the preset angle, it is determined that the screening result of the battery to be tested does not meet the requirements.

12. The method according to claim 9, characterized in that The calculating of the tangent value according to the discharge voltage change value and the discharge capacity change value, and taking the target angle corresponding to the tangent value as the correlation relationship, includes: Performing data standardization processing on the discharge voltage change value and the discharge capacity change value so that the discharge voltage change value and the discharge capacity change value have the same order of magnitude; The tangent value is obtained by taking the quotient of the discharge voltage change value and the discharge capacity change value after the data normalization process.

13. The method according to any one of claims 1 to 3, characterized in that: When there are at least two batteries to be tested, screening the batteries to be tested according to the correlation to obtain screening results includes: Sorting at least two batteries to be tested according to the correlation to obtain a sorting sequence; The at least two batteries to be tested are screened based on the sorting sequence to obtain the screening result.

14. The method according to claim 2 or 3, characterized in that: Before obtaining the discharge data of the battery to be tested within a preset voltage range, the method further includes: Charging the battery to be tested, wherein the charging cut-off voltage is not less than the maximum value of the preset voltage range; The battery to be tested is subjected to a discharge process, and discharge data of the battery to be tested during the discharge process is recorded.

15. The method according to claim 14, characterized in that The charging process of the battery to be tested includes: Obtaining the open circuit voltage of the battery to be tested; When the open circuit voltage is less than a first preset value, the battery to be tested is charged; wherein the first preset value is not less than a maximum value of the preset voltage range, and the charging cut-off voltage is greater than the first preset value.

16. The method according to claim 14, characterized in that The step of discharging the battery to be tested comprises: Obtaining the open circuit voltage of the battery to be tested; When the open circuit voltage is not less than a first preset value, the battery to be tested is discharged, and discharge data of the battery to be tested during the discharge process is recorded; the first preset value is greater than the maximum value of the preset voltage range.

17. A battery screening device, characterized in that: The device comprises: A determination module, used to determine the correlation between the discharge voltage and the discharge capacity of the battery to be tested according to the discharge data of the battery to be tested; The screening module is used to screen the battery to be tested according to the correlation to obtain a screening result; the screening result is used to indicate whether the battery to be tested meets the requirements.

18. An electronic device, characterized in that: comprising a processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 16.

19. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 16 when executed by a processor.

20. A computer program product, characterized in that The method comprises a computer program, which, when executed by a processor, implements the method according to any one of claims 1 to 16.

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