Battery screening methods, systems, electronic devices, and computer-readable storage media

Abstract

This application provides a battery screening method, system, electronic device, and computer-readable storage medium, relating to the field of battery screening. The battery screening method includes: after placing a fully charged target battery in a static state for a first preset time period, measuring a first electrical parameter of the target battery; after the target battery's temperature drops to a target temperature and is placed in a static state for a second preset time period, measuring a second electrical parameter of the target battery; after discharging the target battery to a preset charge at a target temperature, measuring a third electrical parameter of the target battery after discharging to the preset charge; after discharging the target battery to the preset charge at the target temperature and restoring it to the temperature at which the first electrical parameter was measured, measuring a fourth parameter of the target battery; and determining whether the target battery meets the qualification requirements based on the electrical parameters. Using this battery screening method, battery consistency can be accurately and efficiently determined, and battery quality can be effectively checked and differentiated.

Description

Technical Field

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

[0002] To ensure that batteries meet expected performance and lifespan requirements and do not pose a risk to user safety, they are typically subjected to quality testing before leaving the factory. Battery quality checks usually include visual inspection, voltage and internal resistance testing, and capacity testing. These checks allow for the timely detection and elimination of manufacturing defects and quality problems, thereby improving battery quality and performance.

[0003] However, current testing methods, whether visual inspection, voltage and internal resistance testing, or capacity testing, cannot accurately determine the consistency of batteries, making it difficult to guarantee battery quality through these inspections. Summary of the Invention

[0004] The purpose of this application is to provide a battery screening method, system, electronic device, and storage medium that determines whether a target battery meets qualification requirements by analyzing electrical parameters under different conditions. Using this battery screening method, battery consistency can be accurately and efficiently determined, and battery quality can be effectively checked and differentiated.

[0005] In a first aspect, embodiments of this application provide a battery screening method, the screening method comprising: after placing a fully charged target battery in a static state for a first preset time period, measuring a first electrical parameter of the target battery; after the temperature of the target battery drops to a target temperature and is placed in a static state for a second preset time period, measuring a second electrical parameter of the target battery; after discharging the target battery to a preset charge at the target temperature, measuring a third electrical parameter of the target battery after discharging to the preset charge; after discharging the target battery to the preset charge at the target temperature and recovering to the temperature at which the first electrical parameter was measured, measuring a fourth parameter of the target battery; and determining whether the target battery meets the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter.

[0006] In the above implementation process, the battery screening method provided in this application measures the first, second, third, and fourth electrical parameters corresponding to the fully charged state, low temperature state, low temperature discharge state, and reheating state, respectively. Further, the method determines whether the target battery meets the qualification requirements based on the first, second, third, and fourth electrical parameters. Therefore, the first, second, third, and fourth electrical parameters characterize the temperature characteristics and stability of the target battery, respectively. Thus, the battery screening method provided in this application can screen out batteries with high consistency based on the above data, thereby improving battery quality and performance, and ensuring user safety and experience.

[0007] Optionally, in this embodiment, the first electrical parameter includes a first battery voltage; the second electrical parameter includes a second battery voltage; the third parameter includes a third battery voltage; and the fourth parameter includes a fourth battery voltage. The step of determining whether the target battery meets the qualification requirements based on the first, second, third, and fourth electrical parameters includes: calculating a first screening value based on the first and second battery voltages; wherein the first screening value characterizes the temperature characteristics of the target battery in a fully charged state; calculating a second screening value based on the third and fourth battery voltages; wherein the second screening value characterizes the temperature characteristics of the target battery at a preset charge level; determining whether both the first and second screening values ​​meet the qualification requirements; and if both the first and second screening values ​​meet the qualification requirements, then the target battery is determined to meet the qualification requirements.

[0008] In the above implementation process, in this embodiment, a first screening value characterizing the temperature characteristics of the target battery in a fully charged state is calculated using the first battery voltage and the second battery voltage; a second screening value characterizing the temperature characteristics of the target battery with a preset charge level is calculated using the third battery voltage and the fourth battery voltage; based on the first and second screening values, it is determined whether the target battery meets the qualification requirements. Therefore, the battery screening method provided in this embodiment can obtain screening values ​​characterizing temperature characteristics based on the electrical parameters of the battery in different states, and then screen qualified batteries based on these values.

[0009] Optionally, in this embodiment of the application, calculating the first screening value based on the first battery voltage and the second battery voltage includes: calculating the ratio of the second battery voltage to the first battery voltage to obtain the first screening value; calculating the second screening value based on the third battery voltage and the fourth battery voltage includes: calculating the ratio of the fourth battery voltage to the third battery voltage to obtain the second screening value.

[0010] In the above implementation process, the battery screening method provided in this application calculates a first screening value by the ratio of the second battery voltage to the first battery voltage, and calculates a second screening value by the ratio of the fourth battery voltage to the third battery voltage. Target batteries with good temperature characteristics can be screened using the first and second screening values.

[0011] Optionally, in this embodiment of the application, the battery screening method further includes determining whether the batteries that meet the qualification requirements meet the screening requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter.

[0012] In the above implementation process, the battery screening method provided in this application, after calculating the first screening value and the second screening value based on the first electrical parameter, the second electrical parameter, the third electrical parameter and the fourth electrical parameter, and determining whether the target battery meets the qualification requirements, can further screen the target batteries that meet the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter and the fourth electrical parameter, and select the target batteries with better quality.

[0013] Optionally, in this embodiment, the first electrical parameter includes a first resistance value; the second electrical parameter further includes a second resistance value; the third parameter further includes a third resistance value; and the fourth parameter further includes a fourth resistance value. Determining whether a battery meeting the screening requirements conforms to the screening requirements based on the first, second, third, and fourth electrical parameters includes: calculating a third screening value based on the first, second, third, and fourth battery voltages; wherein the third screening value characterizes the discharge performance of the target battery in a low-temperature environment; calculating a fourth screening value based on the first, second, third, and fourth resistance values; wherein the fourth screening value characterizes the internal resistance stability of the target battery when the temperature changes; determining whether both the third and fourth screening values ​​meet the screening requirements; and if both the third and fourth screening values ​​meet the screening requirements, then determining that the battery meeting the qualification requirements conforms to the screening requirements.

[0014] In the above implementation process, the battery screening method provided in this application calculates a fourth screening value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value; calculates the fourth screening value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value; if both the third screening value and the fourth screening value meet the screening requirements, then it is determined that the battery that meets the qualification requirements meets the screening requirements, thereby realizing the further screening of target batteries that meet the screening requirements from target batteries that meet the qualification requirements.

[0015] Optionally, in this embodiment of the application, the step of calculating the third screening value based on the first battery voltage, the second battery voltage, the third battery voltage, and the fourth battery voltage includes: subtracting the first battery voltage from the fourth battery voltage to obtain a first battery voltage difference; subtracting the second battery voltage from the third battery voltage to obtain a second battery voltage difference; and calculating the ratio of the first battery voltage difference to the second battery voltage difference to obtain the third screening value.

[0016] In the above implementation process, the battery screening method provided in this application embodiment determines the voltage decay of the battery at low temperature by calculating the ratio of the voltage decay of the target battery at room temperature to the voltage decay of the target battery at room temperature, which is the third screening value in this application embodiment, thereby enabling the screening of target batteries with better discharge performance in low temperature environments.

[0017] Optionally, in this embodiment of the application, the step of calculating the fourth screening value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value includes: subtracting the first resistance value from the fourth resistance value to obtain a first resistance difference; subtracting the second resistance value from the third resistance value to obtain a second resistance difference; and calculating the ratio of the first resistance difference to the second resistance difference to obtain the fourth screening value.

[0018] In the above implementation process, the application embodiment calculates the ratio of the first resistance difference and the second resistance difference to obtain the fourth screening value D4 = (R1-R4) / (R2-R3). The fourth screening value can characterize the internal resistance stability of the target battery when the temperature changes, thereby reflecting the low temperature performance and stability of the target battery.

[0019] Secondly, embodiments of this application provide a battery screening system, comprising: a parameter acquisition module and a screening module; the parameter acquisition module is used to measure a first electrical parameter of a target battery after it has been left to stand for a first preset time period while fully charged; the parameter acquisition module is also used to measure a second electrical parameter of the target battery after its temperature has dropped to a target temperature and it has been left to stand for a second preset time period; the parameter acquisition module is also used to measure a third electrical parameter of the target battery after it has been discharged to a preset charge at the target temperature; the parameter acquisition module is also used to measure a fourth parameter of the target battery after it has been discharged to a preset charge at the target temperature and recovered to the temperature at which the first electrical parameter was measured; the screening module is used to determine whether the target battery meets the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter.

[0020] Thirdly, embodiments of this application provide an electronic device, which includes a memory and a processor. The memory stores program instructions, and when the processor reads and runs the program instructions, it executes the steps in any of the above implementation methods.

[0021] Fourthly, embodiments of this application also provide a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, perform the steps in any of the above implementations. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart of the battery screening process provided in this application embodiment;

[0024] Figure 2 A flowchart for screening qualified batteries provided in this application embodiment;

[0025] Figure 3 A flowchart for screening high-quality batteries provided in this application embodiment;

[0026] Figure 4 This is a schematic diagram of the modules of the battery screening system provided in the embodiments of this application;

[0027] Figure 5This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. For example, the flowcharts and block diagrams in the drawings illustrate the architecture, functions, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, program segment, or part of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions. In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0029] Battery quality inspection typically includes visual inspection, voltage and internal resistance testing, and capacity testing. These quality inspections can promptly identify and eliminate manufacturing defects and quality problems in the battery, thereby improving the battery's quality and performance.

[0030] During the research process, the applicant discovered that although capacity testing can help ensure the consistency of the battery pack, in actual use, the battery capacity gradually changes with the increase of charge and discharge cycles.

[0031] While visual inspection can help detect defects and damage to the battery's exterior, some internal problems, such as broken battery plates or electrolyte leakage, often cannot be detected through visual inspection.

[0032] While voltage and internal resistance testing can help identify battery electrical performance issues, these tests can only detect the battery's current voltage and internal resistance, and cannot determine the battery's lifespan and performance in actual use.

[0033] Therefore, current testing methods, whether visual inspection, voltage and internal resistance testing, or capacity testing, cannot accurately determine the consistency of batteries and cannot guarantee battery quality.

[0034] Based on this, this application provides a battery screening method, system, electronic device, and storage medium; wherein the battery screening method is applied to the quality screening of batteries before they leave the factory, and can accurately screen out batteries with high consistency, thereby improving the quality and performance of the batteries and ensuring the user's safety and experience.

[0035] It should be noted that battery consistency refers to the fact that after individual cells of the same specification and model are assembled into a battery pack, there are certain differences in parameters such as voltage, charge, capacity and its degradation rate, internal resistance and its rate of change, lifespan, temperature effect, and self-discharge rate.

[0036] Please refer to Figure 1 , Figure 1 A battery screening flowchart is provided for embodiments of this application; in embodiments of this application, the battery screening method may include the following steps:

[0037] Step S100: After the target battery in a fully charged state has been left to stand for a first preset time period, the first electrical parameter of the target battery is measured.

[0038] In step S100 above, after the fully charged target battery is left to stand still for a first preset time period, the first electrical parameter of the target battery is measured.

[0039] It should be noted that, in this embodiment, before the fully charged target battery is left idle for a first preset time period, a constant current constant voltage (CCCV) charging method can be used to charge the target battery to full capacity. The CCCV charging method employs two stages: constant current charging and constant voltage charging. In the constant current stage, the battery is typically charged with a constant current. As the battery voltage gradually increases, it enters the constant voltage stage, where the charger maintains the voltage at a certain level to prevent further voltage increases until the battery is fully charged. This allows for maximum control over the battery's charging rate and time, avoiding overcharging and over-discharging, and extending battery life.

[0040] In step S100 above, the first preset time period can be 30 minutes or more. It should be understood that the reason for letting the fully charged target battery stand still for a period of time is that after charging is completed, there are unstable electrochemical reactions and charge redistribution phenomena inside the battery. These unstable factors can cause instability in the measurement of the electrical parameters of the target battery. Therefore, letting the target battery stand still for the first preset time period before measuring the first electrical parameter can ensure the accuracy of the measured electrical parameter.

[0041] Step S101: After the temperature of the target battery drops to the target temperature and is left to stand for a second preset time period, measure the second electrical parameter of the target battery.

[0042] In step S101 above, the target battery after measuring the first electrical parameter is cooled down. After the temperature of the target battery drops to the target temperature, the target battery is left to stand for a second preset time period before the second electrical parameter of the target battery is measured.

[0043] The target temperature can be between -30℃ and 20℃. Methods to cool the target battery include placing it in a cooling chamber and using the refrigeration system inside to lower the battery temperature; placing the battery in a coolant and using the low temperature of the coolant to lower the battery temperature; or placing the battery in a low-temperature environment, such as a refrigerator or cold storage, and using the natural temperature drop to lower the battery temperature.

[0044] The second preset time period can be one hour or more. During low-temperature treatment of the battery, the rate of chemical reaction inside the battery slows down due to the decrease in temperature, and the battery's electrical parameters will change to a certain extent. In other words, only by letting it stand for the second preset time period before measuring its electrical parameters can the accuracy of the electrical parameters be guaranteed, thus ensuring the accuracy of the screening.

[0045] Step S102: After discharging the target battery to a preset charge at the target temperature, measure the third electrical parameter of the target battery after discharging to the preset charge.

[0046] In step S102 above, after discharging the target battery at the target temperature to a preset charge, the third electrical parameter of the target battery after discharge is measured.

[0047] The preset charge can be 15% to 95% of the total charge of the target battery. The purpose of discharging the target battery at the target temperature is to examine the discharge capability of the target battery under low temperature conditions.

[0048] Step S103: After the target battery is discharged to a preset charge at the target temperature and then returns to the temperature at which the first electrical parameter was measured, the fourth parameter of the target battery is measured.

[0049] In step S103 above, after the target battery is discharged to a preset charge at the target temperature, the temperature of the target battery is restored to the temperature at which the first electrical parameter was measured; further, the fourth electrical parameter of the target battery is measured.

[0050] Step S104: Determine whether the target battery meets the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter.

[0051] In step S104 above, the target battery is determined to meet the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter and the fourth electrical parameter. For example, the first electrical parameter, the second electrical parameter, the third electrical parameter and the fourth electrical parameter may include electrical parameters such as battery voltage, battery charge, battery capacity and battery internal resistance.

[0052] pass Figure 1 As can be seen, the battery screening method provided in this application measures the first, second, third, and fourth electrical parameters corresponding to the fully charged state, low-temperature state, low-temperature discharge state, and reheating state, respectively. Furthermore, the method determines whether the target battery meets the qualification requirements based on the first, second, third, and fourth electrical parameters. Therefore, it can be seen that the first, second, third, and fourth electrical parameters characterize the temperature characteristics and stability of the target battery, respectively, enabling the screening of batteries with high consistency, thereby improving battery quality and performance, and ensuring user safety and experience.

[0053] Please refer to Figure 2 , Figure 2 A flowchart for screening qualified batteries provided in this application embodiment; in an optional embodiment of this application embodiment, the first electrical parameter includes the first battery voltage; the second electrical parameter includes the second battery voltage; the third parameter includes the third battery voltage; and the fourth parameter includes the fourth battery voltage.

[0054] Determining whether a target battery meets the qualification requirements based on the first, second, third, and fourth electrical parameters can be achieved through the following steps:

[0055] Step S200: Calculate the first screening value based on the first battery voltage and the second battery voltage.

[0056] In step S200 above, a first screening value is calculated based on the voltage difference between the first battery and the second battery. For example, the first battery voltage U1 and the second battery voltage U2 are used to calculate the first screening value. It should be noted that the first battery voltage U1 is the voltage value measured when the battery is fully charged at room temperature, and the second battery voltage U2 is the voltage value measured when the target battery temperature drops to the target temperature. The first screening value characterizes the temperature characteristics of the target battery.

[0057] Step S201: Calculate the second screening value based on the voltage of the third battery and the voltage of the fourth battery.

[0058] In step S201 above, a second screening value is calculated based on the voltage difference between the third battery and the fourth battery. For example, the third battery voltage U3 and the fourth battery voltage U4 are used to calculate the second screening value. It should be noted that the third battery voltage U3 is the voltage value measured under low-temperature discharge conditions, and the fourth battery voltage U4 is the voltage value measured when the target battery temperature recovers from low temperature to normal temperature. The second screening value characterizes the temperature characteristics of the target battery with a preset charge level.

[0059] Step S202: Determine whether both the first screening value and the second screening value meet the qualification requirements.

[0060] Step S203: If both the first screening value and the second screening value meet the qualification requirements, the target battery is determined to meet the qualification requirements.

[0061] In steps S202 to S203 above, after calculating the first screening value and the second screening value, it is determined whether the first screening value and the second screening value both meet the qualification requirements. If the first screening value and the second screening value both meet the qualification requirements, the target battery can be determined to meet the qualification requirements.

[0062] pass Figure 2 As can be seen, in this embodiment, a first screening value characterizing the temperature characteristics of the target battery is calculated using the first battery voltage and the second battery voltage, and a second screening value characterizing the temperature characteristics of the target battery with a preset capacity is calculated using the third battery voltage and the fourth battery voltage; based on the first and second screening values, it is determined whether the target battery meets the qualification requirements. Therefore, the battery screening method provided in this embodiment can obtain screening values ​​characterizing temperature characteristics based on the electrical parameters of the battery under different states, and then screen qualified batteries based on these values.

[0063] In an optional embodiment, calculating a first screening value based on a first battery voltage and a second battery voltage includes: calculating the ratio of the second battery voltage to the first battery voltage to obtain the first screening value. For example, given a first battery voltage U1 and a second battery voltage U2, the first screening value D1 = U2 / U1. It should be noted that U2 / U1 reflects the ratio of the battery's open-circuit voltage at low temperatures to its open-circuit voltage at room temperature, and can be used to evaluate the battery's temperature characteristics. If U2 / U1 is high, it indicates that the battery's open-circuit voltage changes significantly at low temperatures, resulting in poor battery temperature characteristics; conversely, if U2 / U1 is low, it indicates that the battery's open-circuit voltage changes less at low temperatures, resulting in good battery temperature characteristics.

[0064] Based on the voltages of the third and fourth batteries, a second screening value is calculated, including calculating the ratio of the fourth battery voltage to the third battery voltage to obtain the second screening value. For example, given the third battery voltage U3 and the fourth battery voltage U4, the second screening value D2 = U4 / U3. U4 / U3 reflects the ratio of the room temperature voltage to the low-temperature voltage after discharge in a low-temperature environment, and can be used to evaluate the battery's temperature characteristics. Typically, U4 / U3 ≤ 1. If U4 / U3 > 1, it indicates a battery abnormality. The closer the U4 / U3 value is to 1, the better the battery's temperature characteristics after discharge in a low-temperature environment; conversely, a lower U4 / U3 indicates poorer battery temperature characteristics.

[0065] Therefore, the battery screening method provided in this application calculates a first screening value by the ratio of the second battery voltage to the first battery voltage, and a second screening value by the ratio of the fourth battery voltage to the third battery voltage. Target batteries with good temperature characteristics can be screened using the first and second screening values.

[0066] In an optional embodiment, the battery method further includes: among the batteries that meet the qualification requirements, determining whether the batteries that meet the qualification requirements meet the screening requirements based on a first electrical parameter, a second electrical parameter, a third electrical parameter, and a fourth electrical parameter.

[0067] It should be noted that the target battery that meets the screening requirements is a further screening of the target battery that meets the qualification requirements; that is, in the embodiments of this application, the battery performance of the target battery that meets the screening requirements is better than that of the target battery that only meets the qualification requirements.

[0068] Therefore, it can be seen that after calculating the first screening value and the second screening value based on the first electrical parameter, the second electrical parameter, the third electrical parameter and the fourth electrical parameter to determine whether the target battery meets the qualification requirements, the battery screening method provided in this application can further screen the target batteries that meet the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter and the fourth electrical parameter, and select the target batteries with better quality.

[0069] Please refer to Figure 3 , Figure 3 A flowchart for screening high-quality batteries provided in this application embodiment; in an optional embodiment of this application embodiment, the first electrical parameter includes a first resistance value; the second electrical parameter further includes a second resistance value; the third parameter further includes a third resistance value; and the fourth parameter further includes a fourth resistance value.

[0070] Based on the first, second, third, and fourth electrical parameters, it can be determined whether a battery that meets the screening requirements is eligible for screening. This can be achieved through the following steps:

[0071] Step S300: Calculate the third screening value based on the voltages of the first, second, third, and fourth batteries.

[0072] In step S300 above, a third screening value is calculated based on the first battery voltage, the second battery voltage, the third battery voltage, and the fourth battery voltage; for example, the third screening value is calculated based on the first battery voltage U1, the second battery voltage U2, the third battery voltage U3, and the fourth battery voltage U4; in this embodiment of the application, the third screening value characterizes the discharge performance of the target battery in a low-temperature environment.

[0073] Step S301: Calculate the fourth screening value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value.

[0074] In step S301 above, a fourth screening value is calculated based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value; for example, the fourth screening value is calculated based on the first resistance value R1, the second resistance value R2, the third resistance value R3, and the fourth resistance value R4; in this embodiment of the application, the fourth screening value characterizes the internal resistance stability of the target battery when the temperature changes.

[0075] Step S302: Determine whether both the third and fourth filter values ​​meet the filter requirements.

[0076] Step S303: If both the third and fourth screening values ​​meet the screening requirements, then the batteries that meet the qualification requirements are deemed to meet the screening requirements.

[0077] In steps S302-S303 above, it is determined whether the third screening value and the fourth screening value meet the screening requirements. If both the third screening value and the fourth screening value meet the screening requirements, then the battery that meets the qualified requirements meets the screening requirements.

[0078] pass Figure 3 As can be seen, the battery screening method provided in this application calculates a fourth screening value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value; calculates the fourth screening value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value; if both the third screening value and the fourth screening value meet the screening requirements, then the battery that meets the qualified requirements is determined to meet the screening requirements, thereby realizing the further screening of target batteries that meet the screening requirements from the target batteries that meet the qualified requirements.

[0079] In an optional embodiment, a third screening value is calculated based on the first battery voltage, the second battery voltage, the third battery voltage, and the fourth battery voltage, including:

[0080] The voltage difference between the first battery and the fourth battery is calculated to obtain the first battery voltage difference value; the voltage difference between the second battery and the third battery is calculated to obtain the second battery voltage difference value; the ratio of the first battery voltage difference value to the second battery voltage difference value is calculated to obtain the third screening value.

[0081] For example, the difference between the first battery voltage U1 and the fourth battery voltage U4 is used to obtain the first battery voltage difference value U1-U4; the difference between the second battery voltage U2 and the third battery voltage U3 is used to obtain the second battery voltage difference value U2-U3. The ratio of the first battery voltage difference value U1-U4 to the second battery voltage difference value U2-U3, (U1-U4) / (U2-U3), is calculated to obtain the third screening value D3.

[0082] It should be noted that (U1-U4) / (U2-U3) can represent the ratio of the discharge characteristics of the target battery at different temperatures. Here, (U1-U4) represents the voltage decay of the target battery at room temperature, and (U2-U3) represents the voltage decay of the battery at low temperature. Therefore, (U1-U4) / (U2-U3) can be used to evaluate the discharge characteristics of the battery in low-temperature environments, reflecting the battery's discharge performance and stability in low-temperature environments.

[0083] The smaller the ratio (U1-U4) / (U2-U3), the less the battery's discharge degradation occurs at low temperatures, indicating better discharge performance and stability in such environments. Conversely, the larger the ratio (U1-U4) / (U2-U3), the greater the discharge degradation occurs at low temperatures, indicating poorer discharge performance and stability. Therefore, (U1-U4) / (U2-U3) can be used to evaluate the battery's discharge performance at low temperatures, providing a reference for battery applications.

[0084] Therefore, the battery screening method provided in this application determines the voltage decay of the battery at low temperature by calculating the ratio of the voltage decay of the target battery at room temperature to the voltage decay of the target battery at room temperature. This is the third screening value in this application embodiment, thereby enabling the screening of target batteries with better discharge performance in low temperature environments.

[0085] In one optional embodiment, calculating a fourth screening value based on a first resistance value, a second resistance value, a third resistance value, and a fourth resistance value includes: subtracting the first resistance value from the fourth resistance value to obtain a first resistance difference; subtracting the second resistance value from the third resistance value to obtain a second resistance difference; and calculating the ratio of the first resistance difference to the second resistance difference to obtain the fourth screening value.

[0086] For example, the difference between the first resistance value R1 and the fourth resistance value R4 is taken to obtain the first resistance difference value R1-R4; the difference between the second resistance value R2 and the third resistance value R3 is taken to obtain the second resistance difference value R2-R3. The ratio of the first resistance difference value and the second resistance difference value is calculated to obtain the fourth screening value D4 = (R1-R4) / (R2-R3).

[0087] It should be noted that (R1-R4) / (R2-R3) can represent the change in the internal resistance of the target battery; where R1-R4 represents the change in the internal resistance of the target battery at room temperature; R2-R3 represents the change in the internal resistance of the target battery at low temperature; the ratio (R1-R4) / (R2-R3) can reflect the relationship between the change in the internal resistance of the battery at low temperature and the change in the internal resistance after returning to room temperature, and can be used to evaluate the low temperature performance and stability of the battery.

[0088] Therefore, it can be seen that the embodiments of this application obtain the fourth screening value D4 = (R1-R4) / (R2-R3) by calculating the ratio of the first resistance difference and the second resistance difference. The fourth screening value can characterize the internal resistance stability of the target battery when the temperature changes, and thus reflect the low temperature performance and stability of the target battery.

[0089] In some possible implementations, the value range of D1 = U2 / U1 can be [1, 1 + x1], and the value range of D2 = U4 / U3 can be [1 - x1, 1]; where the value of x1 is related to the battery system and temperature; when the target temperature is 20°C and the battery system is NCM523, the value of x1 can be 0.03.

[0090] The values ​​of D3=(U1-U4) / (U2-U3) and D4=(R1-R4) / (R2-R3) can be in the range of [1-x2,1+x2], where x2<x1, and the value of x2 is also related to the battery system and temperature; when the target temperature is 20℃ and the battery system is NCM523, the value of x2 can be 0.02.

[0091] Those skilled in the art will understand that [1,1+x1] and [1-x1,1] are the ranges corresponding to the qualification requirements in the embodiments of this application, and [1-x2,1+x2] are the ranges corresponding to the screening requirements in the embodiments of this application.

[0092] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the modules of a battery screening system provided in an embodiment of this application; a second aspect of this application also provides a battery screening system; the battery screening system 100 includes: a parameter acquisition module 110 and a screening module 120.

[0093] The parameter acquisition module 110 is used to measure the first electrical parameters of the target battery after the target battery in a fully charged state has been left to stand for a first preset time period.

[0094] The parameter acquisition module 110 is also used to measure the second electrical parameters of the target battery after the temperature of the target battery drops to the target temperature and is left to stand for a second preset time period.

[0095] The parameter acquisition module 110 is also used to measure the third electrical parameters of the target battery after discharging it to a preset charge at a target temperature.

[0096] The parameter acquisition module 110 is also used to measure the fourth parameter of the target battery after the target battery has been discharged to a preset charge at a target temperature and returned to the temperature at which the first electrical parameter was measured.

[0097] The screening module 120 is used to determine whether the target battery meets the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter.

[0098] In an optional embodiment, the first electrical parameter includes a first battery voltage; the second electrical parameter includes a second battery voltage; the third parameter includes a third battery voltage; and the fourth parameter includes a fourth battery voltage. The screening module 120 determines whether the target battery meets the qualification requirements based on the first, second, third, and fourth electrical parameters, including: the screening module 120 calculating a first screening value based on the first and second battery voltages; wherein the first screening value characterizes the temperature characteristics of the target battery in a fully charged state; the screening module 120 calculating a second screening value based on the third and fourth battery voltages; wherein the second screening value characterizes the temperature characteristics of the target battery at a preset charge level; the screening module 120 determining whether both the first and second screening values ​​meet the qualification requirements; if both the first and second screening values ​​meet the qualification requirements, the target battery is determined to meet the qualification requirements.

[0099] In an optional embodiment, the screening module 120 calculates a first screening value based on the first battery voltage and the second battery voltage, including: the screening module 120 calculates the ratio of the second battery voltage to the first battery voltage to obtain the first screening value. The screening module 120 calculates a second screening value based on the third battery voltage and the fourth battery voltage, including: the screening module 120 calculates the ratio of the fourth battery voltage to the third battery voltage to obtain the second screening value.

[0100] In an optional embodiment, the screening module 120 is further configured to determine, based on a first electrical parameter, a second electrical parameter, a third electrical parameter, and a fourth electrical parameter, whether a battery that meets the qualification requirements meets the screening requirements.

[0101] In an optional embodiment, the first electrical parameter includes a first resistance value; the second electrical parameter further includes a second resistance value; the third parameter further includes a third resistance value; and the fourth parameter further includes a fourth resistance value. The screening module 120 determines whether a battery meeting the screening requirements conforms to the screening requirements based on the first, second, third, and fourth electrical parameters, including: the screening module 120 calculating a third screening value based on the first, second, third, and fourth battery voltages; wherein the third screening value characterizes the discharge performance of the target battery in a low-temperature environment; the screening module 120 calculating a fourth screening value based on the first, second, third, and fourth resistance values; wherein the fourth screening value characterizes the internal resistance stability of the target battery when the temperature changes; the screening module 120 determining whether both the third and fourth screening values ​​meet the screening requirements; if both the third and fourth screening values ​​meet the screening requirements, then the battery meeting the qualification requirements is determined to conform to the screening requirements.

[0102] In an optional embodiment, the screening module 120 calculates a third screening value based on the first battery voltage, the second battery voltage, the third battery voltage, and the fourth battery voltage, including: the screening module 120 subtracts the first battery voltage from the fourth battery voltage to obtain a first battery voltage difference; the screening module 120 subtracts the second battery voltage from the third battery voltage to obtain a second battery voltage difference; and the screening module 120 calculates the ratio of the first battery voltage difference to the second battery voltage difference to obtain the third screening value.

[0103] In an optional embodiment, the filtering module 120 calculates a fourth filtering value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value, including: the filtering module 120 subtracts the first resistance value from the fourth resistance value to obtain a first resistance difference value; the filtering module 120 subtracts the second resistance value from the third resistance value to obtain a second resistance difference value; and the filtering module 120 calculates the ratio of the first resistance difference value to the second resistance difference value to obtain the fourth filtering value.

[0104] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. An electronic device 300 provided in this application includes: a processor 301 and a memory 302. The memory 302 stores machine-readable instructions executable by the processor 301. When the machine-readable instructions are executed by the processor 301, the method described above is performed.

[0105] Based on the same inventive concept, embodiments of this application also provide a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, perform the steps in any of the above implementations.

[0106] The computer-readable storage medium can be any medium capable of storing program code, such as Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM). The storage medium stores the program, and the processor executes the program after receiving an execution instruction. The method executed by the electronic terminal as defined in any embodiment of this invention can be applied to the processor or implemented by the processor.

[0107] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0108] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0109] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0110] It can be replaced and can be implemented, wholly or partially, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, wholly or partially, in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated.

[0111] The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0112] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0113] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery screening method, characterized by, The screening method includes: After the target battery in a fully charged state is left to stand for a first preset period of time, the first electrical parameter of the target battery is measured. After the temperature of the target battery drops to the target temperature and is left to stand for a second preset time period, the second electrical parameter of the target battery is measured. After discharging the target battery to a preset charge at the target temperature, a third electrical parameter of the target battery after discharging to the preset charge is measured. After the target battery is discharged to a preset charge at a target temperature and then returns to the temperature at which the first electrical parameter was measured, the fourth electrical parameter of the target battery is measured. Based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter, determine whether the target battery meets the qualification requirements; The method further includes: among the batteries that meet the qualification requirements, determining whether the batteries that meet the qualification requirements meet the screening requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter; Wherein, the first electrical parameter includes a first resistance value; the second electrical parameter also includes a second resistance value; the third electrical parameter also includes a third resistance value; and the fourth electrical parameter also includes a fourth resistance value. The step of determining whether a battery meeting the screening requirements conforms to the screening requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter includes: A third screening value is calculated based on the voltages of the first, second, third, and fourth batteries; wherein the third screening value characterizes the discharge performance of the target battery in a low-temperature environment. A fourth screening value is calculated based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value; wherein, the fourth screening value characterizes the internal resistance stability of the target battery when the temperature changes; Determine whether both the third and fourth filter values ​​meet the filter requirements; If both the third and fourth screening values ​​meet the screening requirements, then the battery that meets the qualification requirements is deemed to meet the screening requirements.

2. The method of claim 1, wherein, in, The first electrical parameter includes a first battery voltage; the second electrical parameter includes a second battery voltage; the third electrical parameter includes a third battery voltage; and the fourth electrical parameter includes a fourth battery voltage. The step of determining whether the target battery meets the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter includes: A first screening value is calculated based on the first battery voltage and the second battery voltage; wherein, the first screening value characterizes the temperature characteristics of the target battery in a fully charged state; A second screening value is calculated based on the third battery voltage and the fourth battery voltage; wherein, the second screening value characterizes the temperature characteristics of the target battery with a preset charge level; Determine whether both the first filter value and the second filter value meet the qualification requirements; If both the first screening value and the second screening value meet the qualification requirements, then the target battery is determined to meet the qualification requirements.

3. The method of claim 2, wherein, The step of calculating the first screening value based on the first battery voltage and the second battery voltage includes: calculating the ratio of the second battery voltage to the first battery voltage to obtain the first screening value; The step of calculating the second screening value based on the third battery voltage and the fourth battery voltage includes: calculating the ratio of the fourth battery voltage to the third battery voltage to obtain the second screening value.

4. The method of claim 1, wherein, The step of calculating the third screening value based on the first battery voltage, the second battery voltage, the third battery voltage, and the fourth battery voltage includes: The difference between the voltage of the first battery and the voltage of the fourth battery is used to obtain the voltage difference value of the first battery. The difference between the second battery voltage and the third battery voltage is used to obtain the second battery voltage difference value; The ratio of the voltage difference between the first battery and the voltage difference between the second battery is calculated to obtain the third screening value.

5. The method of claim 1, wherein, The step of calculating the fourth screening value based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value includes: The first resistance value is obtained by subtracting the first resistance value from the fourth resistance value. The second resistance value is obtained by subtracting the third resistance value from the second resistance value. Calculate the ratio of the first resistance difference to the second resistance difference to obtain the fourth screening value.

6. A battery screening system, characterized by, The battery screening system includes: a parameter acquisition module and a screening module; The parameter acquisition module is used to measure the first electrical parameter of the target battery after the target battery in a fully charged state has been left to stand still for a first preset time period. The parameter acquisition module is also used to measure the second electrical parameter of the target battery after the temperature of the target battery drops to the target temperature and is left to stand for a second preset time period. The parameter acquisition module is also used to measure the third electrical parameter of the target battery after discharging it to a preset charge at the target temperature; The parameter acquisition module is further configured to measure a fourth electrical parameter of the target battery after the target battery has been discharged to a preset charge at a target temperature and recovered to the temperature at which the first electrical parameter was measured. The screening module is used to determine whether the target battery meets the qualification requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter. Specifically, the screening module is used to: among the batteries that meet the qualification requirements, determine whether the batteries that meet the qualification requirements meet the screening requirements based on the first electrical parameter, the second electrical parameter, the third electrical parameter, and the fourth electrical parameter; Wherein, the first electrical parameter includes a first resistance value; the second electrical parameter also includes a second resistance value; the third electrical parameter also includes a third resistance value; and the fourth electrical parameter also includes a fourth resistance value. The screening module is further specifically used to: calculate a third screening value based on the first battery voltage, the second battery voltage, the third battery voltage, and the fourth battery voltage; wherein the third screening value characterizes the discharge performance of the target battery in a low-temperature environment; A fourth screening value is calculated based on the first resistance value, the second resistance value, the third resistance value, and the fourth resistance value; wherein, the fourth screening value characterizes the internal resistance stability of the target battery when the temperature changes; Determine whether both the third and fourth filter values ​​meet the filter requirements; If both the third and fourth screening values ​​meet the screening requirements, then the battery that meets the qualification requirements is deemed to meet the screening requirements.

7. An electronic device, comprising: The electronic device includes a memory and a processor. The memory stores program instructions, and when the processor executes the program instructions, it performs the steps of the method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, perform the steps of the method according to any one of claims 1-5.

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