Battery processing method and device, electronic equipment, storage medium and program product

Abstract

The invention relates to a battery processing method and device, electronic equipment, a storage medium and a program product, and the method comprises the steps: obtaining a target internal resistance based on a target capacity retention ratio of a battery and a first mapping relation; wherein the first mapping relation is used for indicating a corresponding relation between the capacity retention ratio and the internal resistance; based on the target internal resistance and a second mapping relation, obtaining the number of available charge and discharge cycles of the battery; wherein the second mapping relation is used for indicating the corresponding relation between the number of charge and discharge cycles and the internal resistance, so that the cycle life of the battery is accurately predicted, and meanwhile, the prediction time of the cycle life of the battery is shortened.

Description

Technical Field

[0001] This disclosure relates to the field of charging, and more particularly to a battery processing method, apparatus, electronic device, storage medium, and program product. Background Technology

[0002] With the development of battery technology, lithium batteries have been widely used due to their long battery life, low price, and high safety, for example, in electronic products, power tools, electric vehicles, and energy storage. Battery cycle life is one of the indicators for measuring battery performance, and predicting battery cycle life provides guidance for the production and development of lithium batteries and battery health management systems.

[0003] However, in related technologies, methods for predicting battery cycle life suffer from inaccuracies and time-consuming processes. Summary of the Invention

[0004] To overcome the problems in related technologies, this disclosure provides a battery processing method, apparatus, electronic device, storage medium, and program product, thereby accurately predicting the cycle life of a battery while shortening the prediction time of the battery's cycle life.

[0005] According to a first aspect of the present disclosure, a battery processing method is provided, comprising:

[0006] Based on the target capacity retention rate of the battery and the first mapping relationship, the target internal resistance is obtained; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance;

[0007] Based on the target internal resistance and the second mapping relationship, the number of available charge-discharge cycles of the battery is obtained; wherein, the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0008] In some embodiments, the method further includes:

[0009] The capacity retention rate of the battery under different preset charge-discharge cycles and the internal resistance of the battery under different preset charge-discharge cycles in a preset state of charge are obtained.

[0010] The first mapping relationship is constructed by fitting each of the capacity retention rates and each of the internal resistances;

[0011] The second mapping relationship is constructed by fitting each of the internal resistances and each of the preset charge-discharge cycle numbers.

[0012] In some embodiments, obtaining the capacity retention rate of the battery under different preset charge-discharge cycles includes:

[0013] Obtain the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles;

[0014] Based on the initial capacity and each of the actual capacities, the capacity retention rate of the battery under each of the preset charge-discharge cycles is obtained.

[0015] In some embodiments, obtaining the initial capacity of the battery and the actual capacity of the battery at different preset charge-discharge cycles includes:

[0016] The battery is controlled to charge and discharge according to a first charge and discharge strategy to determine the initial capacity; wherein the first charge and discharge strategy instructs the battery to charge to the charging cutoff voltage at a first charging rate during charging and to discharge to the discharging cutoff voltage at a first discharging rate during discharging.

[0017] While controlling the battery to charge and discharge according to the second charge and discharge strategy to the preset number of charge and discharge cycles, the battery is controlled to continue to charge and discharge according to the first charge and discharge cycle strategy to determine the actual capacity of the battery at the preset number of charge and discharge cycles, until the actual capacity at each preset number of charge and discharge cycles is obtained.

[0018] In some embodiments, obtaining the internal resistance of the battery under a preset state of charge at different preset charge-discharge cycle numbers includes:

[0019] When the battery is charged and discharged to the preset number of charge and discharge cycles, a first discharge voltage is determined when the battery is in the preset state of charge.

[0020] When the battery is in the preset state of charge, determine the second discharge voltage when the battery discharges for a first preset time according to the preset discharge current for a preset discharge time;

[0021] Based on the first discharge voltage, the second discharge voltage, and the preset discharge current, the internal resistance at the preset number of charge-discharge cycles is determined until the internal resistance at each preset number of charge-discharge cycles is obtained.

[0022] In some embodiments, determining the first discharge voltage when the battery is in the preset state of charge includes:

[0023] Determine the third discharge voltage when the battery reaches a second preset duration at a second discharge rate; wherein the second discharge rate is determined based on the actual capacity under the preset charge-discharge cycle number;

[0024] When it is determined that the battery is in the preset state of charge based on the third discharge voltage, the third discharge voltage is determined to be the first discharge voltage;

[0025] If it is determined that the battery is not in the preset state of charge based on the third discharge voltage, a fourth discharge voltage is collected based on the preset collection frequency when the battery discharges according to the preset discharge current, and the fourth discharge voltage when the battery is in the preset state of charge is determined as the first discharge voltage.

[0026] In some embodiments, the method further includes:

[0027] Based on the internal resistance at each preset charge-discharge cycle number and the actual capacity, the change in internal resistance of the battery at different preset charge-discharge cycle numbers is obtained; wherein, the change in internal resistance characterizes the degree of change in internal resistance within a unit capacity.

[0028] The step of constructing the first mapping relationship by fitting each of the capacity retention rates and each of the internal resistances includes:

[0029] The first mapping relationship is constructed by fitting each of the capacity retention rates and each of the internal resistance changes;

[0030] The step of constructing the second mapping relationship by fitting each of the internal resistances and each of the preset charge-discharge cycle numbers includes:

[0031] The second mapping relationship is constructed by fitting each of the internal resistance changes and each of the preset charge-discharge cycle numbers.

[0032] According to a second aspect of the present disclosure, a battery processing apparatus is provided, comprising:

[0033] The first determining module is configured to obtain the target internal resistance based on the target capacity retention rate of the battery and a first mapping relationship; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance;

[0034] The second determining module is configured to obtain the number of available charge-discharge cycles of the battery based on the target internal resistance and the second mapping relationship; wherein the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0035] In some embodiments, the apparatus further includes:

[0036] The acquisition module is configured to acquire the capacity retention rate of the battery under different preset charge-discharge cycle numbers, and the internal resistance of the battery under different preset charge-discharge cycle numbers in a preset state of charge.

[0037] The first construction module is configured to construct the first mapping relationship by fitting each of the capacity retention rates and each of the internal resistances;

[0038] The second construction module is configured to construct the second mapping relationship by fitting each of the internal resistances and each of the preset charge-discharge cycle numbers.

[0039] In some embodiments, the acquisition module is specifically configured as follows:

[0040] Obtain the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles;

[0041] Based on the initial capacity and each of the actual capacities, the capacity retention rate of the battery under each of the preset charge-discharge cycles is obtained.

[0042] In some embodiments, the acquisition module is further configured to:

[0043] The battery is controlled to charge and discharge according to a first charge and discharge strategy to determine the initial capacity; wherein the first charge and discharge strategy instructs the battery to charge to the charging cutoff voltage at a first charging rate during charging and to discharge to the discharging cutoff voltage at a first discharging rate during discharging.

[0044] While controlling the battery to charge and discharge according to the second charge and discharge strategy to the preset number of charge and discharge cycles, the battery is controlled to continue to charge and discharge according to the first charge and discharge cycle strategy to determine the actual capacity of the battery at the preset number of charge and discharge cycles, until the actual capacity at each preset number of charge and discharge cycles is obtained.

[0045] In some embodiments, the acquisition module is further configured to:

[0046] When the battery is charged and discharged to the preset number of charge and discharge cycles, a first discharge voltage is determined when the battery is in the preset state of charge.

[0047] When the battery is in the preset state of charge, determine the second discharge voltage when the battery discharges for a first preset time according to the preset discharge current for a preset discharge time;

[0048] Based on the first discharge voltage, the second discharge voltage, and the preset discharge current, the internal resistance at the preset number of charge-discharge cycles is determined until the internal resistance at each preset number of charge-discharge cycles is obtained.

[0049] In some embodiments, the acquisition module is further configured to:

[0050] Determine the third discharge voltage when the battery reaches a second preset duration at a second discharge rate; wherein the second discharge rate is determined based on the actual capacity under the preset charge-discharge cycle number;

[0051] When it is determined that the battery is in the preset state of charge based on the third discharge voltage, the third discharge voltage is determined to be the first discharge voltage;

[0052] If it is determined that the battery is not in the preset state of charge based on the third discharge voltage, a fourth discharge voltage is collected based on the preset collection frequency when the battery discharges according to the preset discharge current, and the fourth discharge voltage when the battery is in the preset state of charge is determined as the first discharge voltage.

[0053] In some embodiments, the apparatus further includes:

[0054] The third determining module is configured to obtain the change in internal resistance of the battery under different preset charge-discharge cycle numbers based on the internal resistance under each preset charge-discharge cycle number and the actual capacity under each preset charge-discharge cycle number; wherein, the change in internal resistance characterizes the degree of change in internal resistance within a unit capacity;

[0055] The first building module is specifically configured as follows:

[0056] The first mapping relationship is constructed by fitting each of the capacity retention rates and each of the internal resistance changes;

[0057] The second building module is specifically configured as follows:

[0058] The second mapping relationship is constructed by fitting each of the internal resistance changes and each of the preset charge-discharge cycle numbers.

[0059] According to a third aspect of the present disclosure, an electronic device is provided, comprising:

[0060] processor;

[0061] Memory used to store computer programs or instructions;

[0062] The processor executes the computer program or instructions to implement the steps in any of the battery processing methods in the first aspect described above.

[0063] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, comprising:

[0064] When the computer program or instructions in the storage medium are executed by the processor, the steps in any of the battery processing methods in the first aspect described above are implemented.

[0065] According to a fifth aspect of the present disclosure, a computer program product is provided, including a computer program or instructions, which, when executed by a processor, implement the steps of any of the battery processing methods in the first aspect described above.

[0066] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0067] In this embodiment of the disclosure, the target internal resistance is obtained based on the target capacity retention rate of the battery and a first mapping relationship; wherein the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance; the number of available charge-discharge cycles of the battery is obtained based on the target internal resistance and a second mapping relationship; wherein the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0068] On the one hand, by using the target capacity retention rate, the first mapping relationship, and the second mapping relationship, the number of usable charge-discharge cycles of the battery can be directly obtained. This allows for a qualitative assessment of the battery's cycle life while shortening the prediction time of cycle life, thereby improving the convenience for users to use the battery.

[0069] On the other hand, based on the first mapping relationship, the law of battery capacity decay and internal resistance change can be obtained, and based on the second mapping relationship, the law of battery charge-discharge cycle number and internal resistance change can be obtained. Therefore, based on the first mapping relationship and the second mapping relationship, the cycle life of the battery can be accurately predicted.

[0070] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0071] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0072] Figure 1 This is a flowchart illustrating a battery processing method according to an exemplary embodiment. Figure 1 .

[0073] Figure 2 This is a flowchart illustrating a battery processing method according to an exemplary embodiment. Figure 2 .

[0074] Figure 3 This is a linear relationship illustrated according to an exemplary embodiment. Figure 1 .

[0075] Figure 4 This is a linear relationship illustrated according to an exemplary embodiment. Figure 2 .

[0076] Figure 5 This is a block diagram illustrating a battery processing apparatus according to an exemplary embodiment.

[0077] Figure 6 This is a structural block diagram of an electronic device 600 according to an exemplary embodiment. Detailed Implementation

[0078] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0079] Figure 1 This is a flowchart illustrating a battery processing method according to an exemplary embodiment. Figure 1 ,like Figure 1 As shown, the battery processing method mainly includes the following steps:

[0080] In step 101, the target internal resistance is obtained based on the target capacity retention rate of the battery and the first mapping relationship; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance.

[0081] In step 102, the number of available charge-discharge cycles of the battery is obtained based on the target internal resistance and the second mapping relationship; wherein, the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0082] It should be noted that the battery processing method proposed in this disclosure can be applied to electronic devices. Here, electronic devices can include terminal devices, such as mobile terminals or fixed terminals. Mobile terminals can include devices such as mobile phones, tablets, laptops, and wearable electronic devices. Fixed terminals can include desktop computers, smart TVs, and in-vehicle devices. In some other embodiments, the battery processing method can also be applied to applications installed on electronic devices.

[0083] In other embodiments, the battery processing method of this disclosure can be configured in a battery processing device, which can be located in an electronic device; this disclosure does not limit this. It should be noted that the execution entity of this disclosure can be a central processing unit (CPU) in the electronic device in hardware, and related background services in the electronic device in software; this is not limited.

[0084] In some embodiments, the cycle life of a battery refers to the total number of charge-discharge cycles under specific charge-discharge conditions that allow the battery to maintain a preset capacity. The number of charge-discharge cycles refers to the complete cycle from a fully charged state to a fully discharged state, which may include one or more charging and discharging operations; the preset value may be the capacity retention rate.

[0085] Here, capacity retention rate is the percentage of the battery's capacity after multiple charge-discharge cycles compared to its capacity when fully charged at the factory. Furthermore, the battery's capacity retention rate is negatively correlated with the number of charge-discharge cycles; as the number of cycles increases, the capacity retention rate decreases.

[0086] In addition, the capacity retention rate of a battery is also related to the battery materials. For example, by using new materials, lithium batteries can reduce energy loss and improve capacity retention. At the same time, the capacity retention rate of a battery is also related to the battery's operating environment. For example, high-temperature environments will accelerate the aging of the battery, thereby reducing its capacity retention rate.

[0087] In some embodiments, when the capacity retention rate of a lithium battery falls below 80%, its performance significantly degrades. For example, battery life decreases, charging time increases, and problems such as overheating and swelling may occur. This not only affects the user experience but can also damage electronic devices. Therefore, when the capacity retention rate of a lithium battery is less than 80%, it can be considered to have reached the end of its cycle life, and the battery should be replaced to ensure the normal operation of electronic devices and reduce potential risks. In other words, it is necessary for users to know in advance the number of usable cycles the battery will have at the end of its cycle life during actual use.

[0088] In some embodiments, the target capacity retention rate is the capacity retention rate when the battery's cycle life reaches the end. Here, the target capacity retention rate can be set according to the battery type and application scenario. For example, the target retention rate can be 80% or 78%, etc. This disclosure does not limit this.

[0089] It should be noted that since battery cycle life is determined based on the battery's capacity retention rate, the number of charge-discharge cycles the battery undergoes when the capacity retention rate reaches the target capacity retention rate is determined as the battery's cycle life. However, the battery needs to undergo a significant number of charge-discharge cycles to reach the target capacity retention rate. While directly measuring the total number of charge-discharge cycles when the battery reaches the target capacity retention rate can determine the battery's cycle life, it increases the predicted cycle life duration, which is detrimental to widespread adoption.

[0090] Meanwhile, the internal resistance of a battery characterizes the degree of impediment within the battery, affecting voltage changes during charging and discharging. As the number of charge-discharge cycles increases, the internal resistance rises, causing a greater voltage rise during charging or a greater voltage drop during discharging under the same current conditions. This results in a gradual decrease in the amount of electricity the battery can store and release. Therefore, even if the battery capacity does not change significantly, the actual number of usable charge-discharge cycles will decrease due to the increase in internal resistance. In other words, predicting the number of usable cycles solely based on changes in battery capacity (i.e., capacity retention) is inaccurate.

[0091] It is understandable that there is a close relationship between battery capacity decay and changes in battery internal resistance. At the same time, the degree of battery aging is related to the battery internal resistance, and the number of charge-discharge cycles can reflect the degree of battery aging. Therefore, by obtaining the relationship between capacity decay and changes in internal resistance, as well as the relationship between the number of charge-discharge cycles and changes in internal resistance, the accuracy of predicting battery cycle life can be improved.

[0092] Therefore, in this embodiment of the disclosure, by using a first mapping relationship to indicate the correspondence between capacity retention rate and internal resistance and a second mapping relationship to indicate the correspondence between charge / discharge cycle number and internal resistance, the available charge / discharge cycle number of the battery can be determined. This can accurately predict the cycle life of the battery while shortening the prediction time, which is beneficial for its widespread use.

[0093] Specifically, in actual use, after determining the target capacity retention rate of the battery, the target internal resistance corresponding to the target capacity retention rate can be obtained based on the first mapping relationship; then, based on the second mapping relationship, the number of available charge-discharge cycles corresponding to the target internal resistance can be obtained.

[0094] Here, the first mapping relationship and the second mapping relationship can be obtained by the charge-discharge cycle test of the battery, or by the charge-discharge cycle test of other batteries of the same material type as the battery. This disclosure does not limit this.

[0095] In some embodiments, for batteries made of the same material, after obtaining the first mapping relationship and the second mapping relationship, the first mapping relationship and the second mapping relationship can be embedded into the battery health management system to predict the aging of the battery during user use and improve the convenience of user use of the battery.

[0096] In some embodiments, users can determine the number of usable battery cycles at different capacity retention rates based on a first mapping relationship and a second mapping relationship, for example, determining the number of usable battery cycles when the capacity retention rate is 90%. This allows users to anticipate battery aging and helps them use the battery more effectively.

[0097] In a related technology, the rated capacity C of the battery is recorded first. ap Then record the current value I. lf Finally, based on the battery's I... lf / C ap As a result, the lifespan of lithium-ion batteries can be qualitatively assessed. However, this method of predicting battery cycle life by measuring the magnitude of side reactions in the battery can only determine the quality of lifespan, not the number of usable charge-discharge cycles.

[0098] In another related technology, charge-discharge cycle experiments are conducted on the battery to record temperature changes during charging and calculate the rate of temperature rise relative to the initial state. Based on the number of charge-discharge cycles and the cycle capacity retention rate, the battery's cycle life can be predicted. However, this prediction method requires numerous charge-discharge cycle experiments, resulting in a long prediction time. Furthermore, the rate of temperature rise is affected by both the battery's internal resistance and the charging rate, leading to inaccurate temperature rise rates and consequently, inaccurate predicted cycle life.

[0099] In this embodiment of the disclosure, based on the target capacity retention rate, the first mapping relationship, and the second mapping relationship, the number of usable cycles of the battery can be obtained, thereby making a qualitative judgment on the cycle life of the battery; at the same time, considering the relationship between the battery's capacity decay and internal resistance change, the cycle life of the battery can be accurately predicted through a short charge-discharge cycle test, which can effectively shorten the prediction time.

[0100] In this embodiment of the disclosure, the target internal resistance is obtained based on the target capacity retention rate of the battery and a first mapping relationship; wherein the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance; the number of available charge-discharge cycles of the battery is obtained based on the target internal resistance and a second mapping relationship; wherein the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0101] On the one hand, by using the target capacity retention rate, the first mapping relationship, and the second mapping relationship, the number of usable charge-discharge cycles of the battery can be directly obtained. This allows for a qualitative assessment of the battery's cycle life while shortening the prediction time of cycle life, thereby improving the convenience for users to use the battery.

[0102] On the other hand, based on the first mapping relationship, the law of battery capacity decay and internal resistance change can be obtained, and based on the second mapping relationship, the law of battery charge-discharge cycle number and internal resistance change can be obtained. Therefore, based on the first mapping relationship and the second mapping relationship, the cycle life of the battery can be accurately predicted.

[0103] Figure 2 This is a flowchart illustrating a battery processing method according to an exemplary embodiment. Figure 2 ,like Figure 2 As shown, the battery processing method mainly includes the following steps:

[0104] In step 201, the capacity retention rate of the battery under different preset charge-discharge cycles and the internal resistance of the battery under different preset charge-discharge cycles in a preset state of charge are obtained.

[0105] In step 202, a first mapping relationship is constructed by fitting each capacity retention rate and each internal resistance;

[0106] In step 203, a second mapping relationship is constructed by fitting each internal resistance and each preset charge-discharge cycle number;

[0107] In step 204, the target internal resistance is obtained based on the target capacity retention rate of the battery and the first mapping relationship; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance.

[0108] In step 205, the number of available charge-discharge cycles of the battery is obtained based on the target internal resistance and the second mapping relationship; wherein, the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0109] Understandably, to construct accurate first and second mapping relationships, we can first obtain the battery's fitting data under different preset charge-discharge cycle numbers. The first mapping relationship indicates the correspondence between capacity retention and internal resistance, while the second mapping relationship indicates the correspondence between charge-discharge cycle number and internal resistance. Therefore, the fitting data consists of the capacity retention and internal resistance under each preset charge-discharge cycle number.

[0110] Here, different preset charge-discharge cycle numbers can be set arbitrarily according to requirements. For example, the preset charge-discharge cycle number can be 50, 100, 150, etc. This disclosure embodiment does not limit this.

[0111] Understandably, because the movement of lithium ions and the internal electrochemical reactions differ depending on the battery's state of charge, the battery's internal resistance is affected, leading to inaccurate internal resistance readings. Therefore, to obtain accurate internal resistance, a preset state of charge can be set, and the internal resistance of the battery under that preset state of charge can be determined.

[0112] Here, the preset state of charge (SOC) is one that has a minimal impact on the battery's internal resistance. For example, when the SOC is 50%, the lithium-ion concentrations embedded in the positive and negative electrodes are similar, resulting in a small concentration difference between the electrodes and thus a stable internal resistance. Simultaneously, when the SOC is 50%, the electrochemical reactions inside the battery are relatively stable, leading to a low electrochemical impedance and thus a stable internal resistance. Therefore, the preset SOC can be 50%. Alternatively, considering that the ambient temperature also affects the battery's internal resistance, the preset SOC can also be set to 55% or 45%, and this embodiment does not limit this setting.

[0113] In some embodiments, to improve the accuracy of obtaining internal resistance and actual capacity, the battery can be controlled to undergo charge-discharge cycle testing at an ambient temperature of around 25°C to reduce the impact of temperature on the battery.

[0114] In some embodiments, in order to improve the accuracy of constructing the first mapping relationship and the second mapping relationship, when the number of charge-discharge cycles of the battery reaches the preset number of charge-discharge cycles, the battery can be charged and discharged according to the preset charge-discharge strategy to obtain the capacity retention rate and internal resistance of the battery after experiencing the preset number of charge-discharge cycles. This process is repeated until the capacity retention rate and internal resistance of the battery after experiencing various different numbers of charge-discharge cycles are obtained, so as to construct the first mapping relationship and the second mapping relationship.

[0115] Here, the first and second mapping relationships can be linear functions. The first mapping relationship is obtained by fitting each capacity retention rate and each internal resistance using the least squares method; and the second mapping relationship is obtained by fitting each preset charge-discharge cycle number and each internal resistance. For example, the first mapping relationship is expressed as follows:

[0116] y1=a1x1+b1 (1);

[0117] In formula (1), y1 is the internal resistance, x1 is the capacity retention rate, a1 is the slope, and b1 is the intercept.

[0118] Another example is the second mapping relationship, expressed as follows:

[0119] y2=a2x2+b2 (2);

[0120] In formula (2), y2 is the internal resistance, x2 is the preset number of charge-discharge cycles, a2 is the slope, and b2 is the intercept.

[0121] In this embodiment of the disclosure, after obtaining the capacity retention rate and internal resistance under different preset charge-discharge cycle numbers, the first average value corresponding to each capacity retention rate and the second average value corresponding to each internal resistance can be calculated respectively; the first average value, each capacity retention rate, the second average value, and the corresponding internal resistance can be substituted into the slope calculation formula to obtain the first slope corresponding to the linear function; then the first average value, the second average value, and the first slope can be substituted into the intercept calculation formula to obtain the first intercept corresponding to the linear function; finally, based on the first slope and the first intercept, the first mapping relationship is obtained.

[0122] Similarly, first calculate the third average value corresponding to each preset charge-discharge cycle number, and then substitute the second average value, each internal resistance, the third average value, and the corresponding internal resistance into the slope calculation formula to obtain the second slope corresponding to the linear function; then substitute the second average value, the third average value, and the second slope into the intercept calculation formula to obtain the second intercept corresponding to the linear function; finally, based on the second slope and the second intercept, obtain the second mapping relationship.

[0123] In this embodiment of the disclosure, after obtaining the capacity retention rate and internal resistance of the battery under different preset charge-discharge cycle numbers, a first mapping relationship is constructed by fitting each capacity retention rate and each internal resistance, and a second mapping relationship is constructed by fitting each internal resistance and each preset charge-discharge cycle number. In this way, a prediction model for the cycle life of the battery can be established, thereby accurately predicting the cycle life of the battery while shortening the prediction time.

[0124] In some embodiments, obtaining the capacity retention rate of the battery at different preset charge-discharge cycles includes:

[0125] Obtain the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles;

[0126] Based on the initial capacity and each actual capacity, the capacity retention rate of the battery under each preset charge-discharge cycle number is obtained.

[0127] Understandably, the battery capacity retention rate is the percentage between the initial capacity and the actual capacity. Therefore, we first obtain the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles, and then calculate the capacity retention rate under different preset charge-discharge cycles, thus laying the foundation for building the first mapping relationship.

[0128] Here, the initial capacity of the battery can be either the battery's nominal capacity or the capacity obtained from actual battery testing.

[0129] In some embodiments, the battery testing equipment or system controlling the charging and discharging process of the battery can set corresponding test parameters, such as charging and discharging current, voltage range, and number of charge and discharge cycles, according to a preset number of charge and discharge cycles. After setting the test parameters, the battery testing equipment or system is started to perform charge and discharge cycles on the battery. During the test, the battery testing equipment or system can record the battery's discharge capacity, thereby obtaining the actual capacity of the battery at each preset number of charge and discharge cycles.

[0130] In this embodiment of the disclosure, the capacity retention rate of the battery under various preset charge-discharge cycles is obtained by using the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles, thereby providing fitting data for constructing the first mapping relationship and laying the foundation for predicting the cycle life of the battery.

[0131] In some embodiments, obtaining the initial capacity of the battery and the actual capacity of the battery at different preset charge-discharge cycles includes:

[0132] The battery is controlled to charge and discharge according to a first charge and discharge strategy to determine the initial capacity; wherein, the first charge and discharge strategy instructs the battery to charge to the charging cut-off voltage according to a first charging rate during charging and to discharge to the discharging cut-off voltage according to a first discharging rate during discharging.

[0133] While controlling the battery to charge and discharge according to the second charge and discharge strategy to the preset number of charge and discharge cycles, the battery is controlled to continue to charge and discharge according to the first charge and discharge cycle strategy to determine the actual capacity of the battery under the preset number of charge and discharge cycles, until the actual capacity under each preset number of charge and discharge cycles is obtained.

[0134] Understandably, considering the discrepancy between the battery's initial capacity and its nominal capacity, the battery can be controlled to charge and discharge according to the first charging and discharging strategy to obtain the battery's actual initial capacity, thereby improving the accuracy of constructing the first mapping relationship.

[0135] It's important to note that selecting an appropriate charging rate ensures the battery is fully charged within the specified time without being damaged by overcharging. When the battery is charged to the charging cutoff voltage according to the specified rate, it is considered fully charged, and a discharge test can be performed. Similarly, selecting an appropriate discharge rate ensures the battery maintains stable voltage and current output during discharge. When the battery is discharged to the discharge cutoff voltage according to the specified discharge rate, it is considered discharged, and the accurate discharge capacity is obtained.

[0136] Therefore, in order to obtain an accurate initial capacity, the first charge-discharge strategy instructs the battery to charge to the charging cutoff voltage at a first charging rate during charging and to discharge to the discharging cutoff voltage at a first discharging rate during discharging.

[0137] Here, the first charging rate only needs to ensure that the battery has a stable current input during the charging process, for example, the first charging rate is 0.5C (where C is the nominal capacity of the battery), and the first discharging rate only needs to ensure that the battery has a stable current output during the discharging process, for example, the first discharging rate is 0.1C. This disclosure does not limit this aspect.

[0138] For example, during charging, the battery is controlled to charge at a current of 0.5C until the charging voltage reaches the charging cutoff voltage, for example, 4.2 volts (V); during discharging, the battery is controlled to discharge at a current of 0.1C until the discharging voltage reaches the discharging cutoff voltage, for example, 3.0V.

[0139] In some embodiments, after the battery is charged to the charging cutoff voltage at a first charging rate, the battery voltage is still relatively high. Directly discharging the battery would cause voltage fluctuations, affecting its performance and stability. Simultaneously, a series of chemical reactions occur inside the battery during charging. To ensure these reactions proceed fully and to maintain battery performance and stability, the battery can be allowed to rest for a period of time. After this resting period reaches a first specified duration, the battery is then discharged at the first discharge rate to the discharge cutoff voltage to obtain the battery's discharge capacity, i.e., its actual capacity. Here, the first duration can be arbitrarily set according to requirements, for example, 5 minutes (min).

[0140] Understandably, when the battery is controlled to charge and discharge according to the second charge and discharge strategy to the preset number of charge and discharge cycles, it is determined that the aging test of the battery at the preset number of charge and discharge cycles has been completed. In order to obtain the actual capacity of the battery at the preset number of charge and discharge cycles, the battery can be controlled to charge and discharge according to the first charge and discharge strategy to obtain the accurate discharge capacity.

[0141] Here, controlling the battery to charge and discharge according to the second charge and discharge strategy is for aging tests of the battery to simulate actual battery usage. Therefore, the first charge and discharge strategy and the second charge and discharge strategy can be the same. For example, the second charge and discharge strategy also instructs the battery to charge to the charging cutoff voltage at the first charging rate and to discharge to the discharging cutoff voltage at the first discharging rate. The first charge and discharge strategy and the second charge and discharge strategy can also be different. For example, the second charge and discharge strategy instructs the battery to charge to the charging cutoff voltage at the third charging rate and to discharge to the discharging cutoff voltage at the third discharging rate. This embodiment of the present disclosure does not limit this.

[0142] In this embodiment of the present disclosure, after determining the actual capacity at the current preset charge-discharge cycle number, the battery is controlled to continue charging and discharging according to the second charge-discharge strategy. When the battery is charged and discharged according to the second charge-discharge strategy to the next preset charge-discharge cycle number, the battery is controlled to charge and discharge according to the first charge-discharge strategy to obtain the actual capacity of the battery at the next preset charge-discharge cycle number. This process is repeated until the actual capacity at different preset cycle numbers is obtained.

[0143] For example, when the battery is controlled to charge and discharge according to the second charge and discharge strategy to the preset number of charge and discharge cycles, the battery is controlled to charge at 0.5C (where C is the initial capacity) until the charging voltage reaches the charging cutoff voltage; then the battery is controlled to discharge at 0.1C until the discharge voltage drops to the discharge cutoff voltage, and the battery is left to stand for 5 minutes to determine the total discharge amount of the battery during the discharge process. The total discharge amount is determined as the actual capacity of the battery under the preset number of charge and discharge cycles.

[0144] In this embodiment of the disclosure, by first controlling the battery to charge and discharge according to the second charge and discharge strategy to a preset number of charge and discharge cycles, the aging test of the battery can be realized. Then, by controlling the battery to charge and discharge according to the first charge and discharge strategy, the capacity change of the battery during the aging process can be obtained, and the accurate discharge capacity can be obtained. This can improve the accuracy of obtaining the actual capacity under each preset number of charge and discharge cycles, and thus improve the accuracy of constructing the first mapping relationship.

[0145] In some embodiments, obtaining the internal resistance of a battery under a preset state of charge at different preset charge-discharge cycles includes:

[0146] Determine the first discharge voltage when the battery is in a preset state of charge after charging and discharging the battery to a preset number of charge and discharge cycles.

[0147] When the battery is in a preset state of charge, determine the second discharge voltage when the battery discharges for a first preset duration according to a preset discharge current for a preset duration;

[0148] Based on the first discharge voltage, the second discharge voltage, and the preset discharge current, the internal resistance at the preset number of charge-discharge cycles is determined until the internal resistance at each preset number of charge-discharge cycles is obtained.

[0149] It should be noted that the internal resistance of a battery is the resistance caused by polarization during the electrochemical reactions within the battery. It is related to the various movements of lithium ions, the continuous transfer of related charges, and the complex electrochemical reactions within the battery. In other words, the internal resistance of a battery changes in real time and cannot be directly measured. Therefore, the internal resistance of a battery can be calculated by collecting parameters such as current and voltage.

[0150] It is understandable that when the battery is charged and discharged to the preset number of charge and discharge cycles, it is determined that the aging test of the battery at the preset number of charge and discharge cycles has been completed. When the battery is in the preset state of charge, the impact on the battery's internal resistance is small. Therefore, the first discharge voltage of the battery when it is in the preset state of charge can be determined, and the battery's internal resistance can be determined based on the first discharge voltage.

[0151] Here, when conducting aging tests on the battery, the battery can be controlled to charge and discharge according to the second charge and discharge strategy, and when the battery is charged and discharged according to the second charge and discharge strategy to a preset number of charge and discharge cycles, the first discharge voltage at which the battery is in a preset state of charge is determined.

[0152] In some embodiments, when the battery is controlled to charge and discharge according to the second charge and discharge strategy to a preset number of charge and discharge cycles, the battery is in a discharged state. It can be first charged to the charging cut-off voltage according to the preset charging rate so that the battery is in a fully charged state; then discharged according to the preset discharge rate until the battery is in a preset state of charge, and the discharge voltage at this time is determined as the first discharge voltage.

[0153] It should be noted that the internal resistance of the battery at the preset number of charge-discharge cycles can be calculated using Ohm's law. For ease of calculation, a preset discharge current can be set in advance. After determining the first discharge voltage, the battery is discharged according to the preset discharge current, and the second discharge voltage after discharge is recorded. Finally, based on the first discharge voltage, the second discharge voltage, and the preset discharge current, the internal resistance of the battery at the preset number of charge-discharge cycles can be obtained.

[0154] Here, to facilitate obtaining a stable and accurate second discharge voltage, a first preset duration can be preset. When the discharge duration according to the preset discharge current reaches the first preset duration, the discharge voltage at this time is determined as the second discharge voltage. The first preset duration can be set relatively small, so that when the battery reaches the first preset duration according to the preset discharge current, the battery is still close to the preset state of charge, which is beneficial for obtaining accurate internal resistance. For example, the first preset duration is 500 milliseconds (ms), but this embodiment does not limit this.

[0155] Understandably, after determining the internal resistance at the current preset charge-discharge cycle number, the battery is controlled to continue charging and discharging according to the second charge-discharge strategy. When charging and discharging according to the second charge-discharge strategy to the next preset charge-discharge cycle number, the first discharge voltage when the battery is in a preset state of charge is determined. The second discharge voltage when the battery discharges for a preset discharge current for a preset duration reaches a first preset duration is also determined. Finally, based on the first discharge voltage, the second discharge voltage, and the preset discharge current, the internal resistance of the battery at the next preset charge-discharge cycle number is determined. This process is repeated until the internal resistance at different preset cycle numbers is obtained.

[0156] In this embodiment of the disclosure, the battery aging test is achieved by first controlling the battery to charge and discharge to a preset number of charge and discharge cycles. Then, the first discharge voltage of the battery under a preset state of charge and the second discharge voltage of the battery when the discharge time reaches a first preset time according to the preset discharge current are determined. The internal resistance of the battery is calculated by Ohm's law, thereby improving the accuracy of obtaining the internal resistance under each preset number of charge and discharge cycles, and thus improving the accuracy of constructing the first mapping relationship and / or the second mapping relationship.

[0157] In some embodiments, determining a first discharge voltage when the battery is in a preset state of charge includes:

[0158] Determine the third discharge voltage when the battery reaches the second preset time after discharging at the second discharge rate; wherein the second discharge rate is determined based on the actual capacity under the preset number of charge-discharge cycles;

[0159] If the battery is determined to be in a preset state of charge based on the third discharge voltage, the third discharge voltage is determined as the first discharge voltage.

[0160] If the battery is determined not to be in the preset state of charge based on the third discharge voltage, the fourth discharge voltage of the battery being discharged according to the preset discharge current is collected based on the preset collection frequency, and the fourth discharge voltage of the battery being in the preset state of charge is determined as the first discharge voltage.

[0161] Understandably, when controlling the battery charge and discharge to a preset number of charge / discharge cycles, the battery is first charged to a full charge state, and then discharged according to a second discharge rate. To accurately control the battery to be in a preset state of charge, a second preset duration can be set. When the discharge duration according to the second discharge rate reaches the second preset discharge duration, the third discharge voltage at this time is obtained. This not only reduces the possibility that the battery's state of charge after discharge is less than the preset state of charge, but also avoids the problem of not being able to calculate the battery's internal resistance when it is close to or at the preset state of charge because the discharge voltage was not obtained in time.

[0162] Here, in order to ensure the stability of battery discharge, the second discharge rate can be determined based on the actual capacity under a preset number of charge-discharge cycles. For example, if the actual capacity is 4.5 ampere-hours (Ah) and the discharge current is 0.45 amperes (A), the second discharge rate is 0.1C.

[0163] In some embodiments, since the second preset duration is the time from when the battery is discharged from a fully charged state to when the battery is close to or in a preset state of charge, and the first preset duration is the time when the battery is discharged while controlling the battery to be in a preset discharge state, and at the same time ensuring that the battery is close to the preset state of charge, the second preset duration is much longer than the first preset duration. For example, the second preset duration is 1 hour (h) and the first preset duration is 500ms.

[0164] In some embodiments, battery discharge experiments can obtain battery voltages at different states of charge (SOCs). These battery voltages are then mapped to known SOCs, forming a voltage-SOC curve. Therefore, in practical applications, by measuring the battery's open-circuit voltage and searching the mapping relationship for the corresponding SOC, an estimation of the SOC can be achieved. Thus, given a determined third discharge voltage, the SOC corresponding to the third discharge voltage can be determined based on the mapping relationship. This SOC can then be matched with a preset SOC to determine whether the battery is in the preset SOC state.

[0165] Here, if the battery is determined to be in a preset state of charge based on the third discharge voltage, then the third discharge voltage is the first discharge voltage at which the battery is in the preset state of charge.

[0166] If it is determined that the battery is not in the preset state of charge based on the third discharge voltage, the battery will continue to be controlled to discharge according to the preset discharge current, and the fourth discharge voltage of the battery discharging according to the preset discharge current will be collected based on the preset collection frequency, so as to accurately obtain the first discharge voltage of the battery when it is in the preset state of charge.

[0167] Here, in order to reduce the chance of not obtaining the first discharge voltage, the preset sampling frequency can be set to a relatively small value, such as 10 milliseconds / time. This embodiment of the present disclosure does not limit this.

[0168] It is understandable that during the process of charging the battery to the second preset time according to the preset charging current, the state of charge of the battery is determined based on each of the collected fourth discharge voltages, and the fourth discharge voltage corresponding to the preset state of charge is determined as the first discharge voltage.

[0169] In some embodiments, given each fourth discharge voltage, the state of charge corresponding to the fourth discharge voltage can be determined based on the mapping relationship, and then each state of charge can be matched with a preset state of charge.

[0170] For example, after the battery has been charged and discharged to a preset number of charge-discharge cycles, it is controlled to perform constant current charging at 0.5C (where C is the actual capacity at the preset number of charge-discharge cycles) until the charging voltage reaches the charging cutoff voltage. Then, it switches to constant voltage charging mode and continues to charge the battery until the charging current drops below 0.02C. The battery is then allowed to rest for 10 minutes. Next, the battery is controlled to discharge at a constant current of 0.1C for 1 hour. The battery is then allowed to rest for 2 hours, and the third discharge voltage is recorded. The state of charge of the battery is determined based on the third discharge voltage.

[0171] Then, the battery is discharged at a preset discharge current of 1.0A for 500ms. During this period, the fourth discharge voltage of the battery is collected every 10ms, and the second discharge voltage after 500ms is recorded.

[0172] If the battery is determined to be in a preset state of charge based on the third discharge voltage, then the battery's internal resistance is obtained based on the third discharge voltage, the second discharge voltage, and the preset discharge current. If the battery is determined not to be in a preset state of charge based on the third discharge voltage, then the battery's internal resistance is obtained based on the fourth discharge voltage (when the battery is in a preset state of charge), the second discharge voltage, and the preset discharge current.

[0173] In this embodiment, by determining the third discharge voltage when the battery discharges at the second discharge rate for a second preset duration, the situation where the battery's state of charge after discharge is less than the preset state of charge is reduced. If the battery is determined to be in the preset state of charge based on the third discharge voltage, the third discharge voltage is determined as the first discharge voltage. If the battery is determined not to be in the preset state of charge based on the third discharge voltage, a fourth discharge voltage is acquired based on a preset acquisition frequency when the battery discharges at a preset discharge current, and the fourth discharge voltage when the battery is in the preset state of charge is determined as the first discharge voltage. This obtains an accurate first discharge voltage, which helps improve the accuracy of determining the internal resistance under the preset state of charge, making the battery cycle life prediction more accurate.

[0174] In some embodiments, the method further includes:

[0175] Based on the internal resistance and actual capacity at each preset charge-discharge cycle number, the change in internal resistance of the battery at different preset charge-discharge cycle numbers is obtained; where the change in internal resistance characterizes the degree of change of internal resistance within a unit capacity.

[0176] By fitting each of the aforementioned capacity retention rates and internal resistances, a first mapping relationship is constructed, including:

[0177] The first mapping relationship is constructed by fitting each capacity retention rate and each internal resistance change.

[0178] A second mapping relationship is constructed by fitting each internal resistance and each preset charge-discharge cycle number, including:

[0179] A second mapping relationship is constructed by fitting each change in internal resistance and each preset number of charge-discharge cycles.

[0180] It should be noted that due to the differences in battery capacity, the internal resistance of a given battery also varies. Therefore, in order to better predict the cycle life of a battery, the internal resistance under different preset charge-discharge cycle numbers can be normalized to obtain the change in internal resistance of the battery under different preset charge-discharge cycle numbers, thereby improving the inaccuracy of internal resistance caused by differences in battery capacity.

[0181] Here, the ratio of the internal resistance to the corresponding actual capacity is calculated for each preset number of cycles to obtain the change in the internal resistance of the battery for each preset number of cycles.

[0182] Understandably, after obtaining the various internal resistance changes, we can fit the various capacity retention rates and the various internal resistance changes to construct a first mapping relationship, thereby capturing the law of battery capacity decay and internal resistance change. We can also fit the various internal resistance changes and the various preset charge-discharge cycle numbers to construct a second mapping relationship, thereby capturing the law of battery aging and internal resistance change. This can improve the accuracy of predicting battery cycle life while shortening the predicted battery cycle life duration.

[0183] In this embodiment, the internal resistances are normalized to improve the inaccuracy of internal resistance due to differences in battery capacity. Then, a first mapping relationship is constructed by fitting the capacity retention rate and the change in internal resistance, and a second mapping relationship is constructed by fitting the change in internal resistance and the preset number of charge-discharge cycles. This can further improve the accuracy of predicting the cycle life of the battery while shortening the predicted cycle life.

[0184] For example, based on the aforementioned methods for obtaining the internal resistance and actual capacity of the battery under different preset charge-discharge cycles, the experimental data shown in Table 1 can be obtained.

[0185] Since the internal resistance growth rate of a battery can reflect the trend of the change in the battery's internal resistance with the number of charge-discharge cycles, after obtaining each change in internal resistance, the internal resistance growth rate under each preset number of cycles can be further obtained.

[0186] Table 1 Summary of data for different preset charge / discharge cycles of the battery

[0187]

[0188] Based on the preset charge / discharge cycle number, internal resistance growth rate, and capacity retention rate in Table 1, data fitting was performed to obtain the first mapping relationship and the second mapping relationship, respectively.

[0189] Figure 3 This is a linear relationship illustrated according to an exemplary embodiment. Figure 1 ,like Figure 3 As shown, a linear relationship graph is obtained with the battery capacity retention rate as the X-axis and the internal resistance growth rate as the Y-axis. The first mapping relationship is obtained by fitting: y1 = -11.86x + 1177.059. According to the first mapping relationship, it can be calculated that when the battery capacity retention rate is 95%, the corresponding internal resistance growth rate is 50.36%.

[0190] Figure 4 This is a linear relationship illustrated according to an exemplary embodiment. Figure 2 ,like Figure 4 As shown, a linear relationship graph is obtained with the preset number of charge / discharge cycles as the X-axis and the internal resistance growth rate as the Y-axis. A second mapping relationship is obtained through fitting: y2 = 0.1154x + 4.0386. Based on this second mapping relationship, the number of charge / discharge cycles corresponding to an internal resistance growth rate of 50.36% is 401, which means the number of charge / discharge cycles corresponding to a battery capacity retention rate of 95% is also 401.

[0191] Compared to the 94.9% measured when the battery underwent 400 charge-discharge cycles as shown in Table 1 above, the predicted capacity retention rate error is within 1%, indicating that the cycle life prediction method in this disclosure has high reliability and good prediction effect.

[0192] Figure 5 This is a block diagram illustrating a battery processing apparatus according to an exemplary embodiment, such as... Figure 5 As shown, the battery processing device 500 includes:

[0193] The first determining module 501 is configured to obtain the target internal resistance based on the target capacity retention rate of the battery and a first mapping relationship; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance.

[0194] The second determining module 502 is configured to obtain the number of available charge-discharge cycles of the battery based on the target internal resistance and the second mapping relationship; wherein the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0195] In some embodiments, the device 500 further includes:

[0196] The acquisition module is configured to acquire the capacity retention rate of the battery under different preset charge-discharge cycle numbers, and the internal resistance of the battery under different preset charge-discharge cycle numbers in a preset state of charge.

[0197] The first construction module is configured to construct the first mapping relationship by fitting each of the capacity retention rates and each of the internal resistances;

[0198] The second construction module is configured to construct the second mapping relationship by fitting each of the internal resistances and each of the preset charge-discharge cycle numbers.

[0199] In some embodiments, the acquisition module is specifically configured as follows:

[0200] Obtain the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles;

[0201] Based on the initial capacity and each of the actual capacities, the capacity retention rate of the battery under each of the preset charge-discharge cycles is obtained.

[0202] In some embodiments, the acquisition module is further configured to:

[0203] The battery is controlled to charge and discharge according to a first charge and discharge strategy to determine the initial capacity; wherein the first charge and discharge strategy instructs the battery to charge to the charging cutoff voltage at a first charging rate during charging and to discharge to the discharging cutoff voltage at a first discharging rate during discharging.

[0204] While controlling the battery to charge and discharge according to the second charge and discharge strategy to the preset number of charge and discharge cycles, the battery is controlled to continue to charge and discharge according to the first charge and discharge cycle strategy to determine the actual capacity of the battery at the preset number of charge and discharge cycles, until the actual capacity at each preset number of charge and discharge cycles is obtained.

[0205] In some embodiments, the acquisition module is further configured to:

[0206] When the battery is charged and discharged to the preset number of charge and discharge cycles, a first discharge voltage is determined when the battery is in the preset state of charge.

[0207] When the battery is in the preset state of charge, determine the second discharge voltage when the battery discharges for a first preset time according to the preset discharge current for a preset discharge time;

[0208] Based on the first discharge voltage, the second discharge voltage, and the preset discharge current, the internal resistance at the preset number of charge-discharge cycles is determined until the internal resistance at each preset number of charge-discharge cycles is obtained.

[0209] In some embodiments, the acquisition module is further configured to:

[0210] Determine the third discharge voltage when the battery reaches a second preset duration at a second discharge rate; wherein the second discharge rate is determined based on the actual capacity under the preset charge-discharge cycle number;

[0211] When it is determined that the battery is in the preset state of charge based on the third discharge voltage, the third discharge voltage is determined to be the first discharge voltage;

[0212] If it is determined that the battery is not in the preset state of charge based on the third discharge voltage, a fourth discharge voltage is collected based on the preset collection frequency when the battery discharges according to the preset discharge current, and the fourth discharge voltage when the battery is in the preset state of charge is determined as the first discharge voltage.

[0213] In some embodiments, the device 500 further includes:

[0214] The third determining module is configured to obtain the change in internal resistance of the battery under different preset charge-discharge cycle numbers based on the internal resistance under each preset charge-discharge cycle number and the actual capacity under each preset charge-discharge cycle number; wherein, the change in internal resistance characterizes the degree of change in internal resistance within a unit capacity;

[0215] The first building module is specifically configured as follows:

[0216] The first mapping relationship is constructed by fitting each of the capacity retention rates and each of the internal resistance changes;

[0217] The second building module is specifically configured as follows:

[0218] The second mapping relationship is constructed by fitting each of the internal resistance changes and each of the preset charge-discharge cycle numbers.

[0219] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0220] Figure 6 This is a structural block diagram illustrating an electronic device 600 according to an exemplary embodiment. For example, the electronic device 600 may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0221] Reference Figure 6The electronic device 600 may include one or more of the following components: processing component 602, memory 604, power supply component 606, multimedia component 608, audio component 610, input / output (I / O) interface 612, sensor component 614, and communication component 616.

[0222] Processing component 602 typically controls the overall operation of electronic device 600, such as operations associated with at least one of display, telephone call, data communication, camera operation, and recording operation. Processing component 602 may include one or more processors 620 to execute instructions to perform all or part of the steps of the methods described above. Furthermore, processing component 602 may include one or more modules to facilitate interaction between processing component 602 and other components. For example, processing component 602 may include a multimedia module to facilitate interaction between multimedia component 608 and processing component 602.

[0223] Memory 604 is configured to store various types of data to support the operation of electronic device 600. Examples of such data include at least one of the following: instructions for any application or method operating on electronic device 600, contact data, phonebook data, messages, pictures, and videos. Memory 604 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0224] Power supply component 606 provides power to various components of electronic device 600. Power supply component 606 may include at least one of the following: a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 600.

[0225] Multimedia component 608 includes a screen that provides an output interface between electronic device 600 and user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a Touch Panel, the screen may be implemented as a touchscreen to receive input signals from the user. The Touch Panel includes one or more touch sensors to sense touches, swipes, and gestures on the Touch Panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 608 includes a front-facing camera and / or a rear-facing camera. When electronic device 600 is in an operating mode, such as a shooting mode or video mode, the front-facing camera and / or rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0226] Audio component 610 is configured to output and / or input audio signals. For example, audio component 610 includes a microphone (MIC) configured to receive external audio signals when electronic device 600 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 604 or transmitted via communication component 616. In some embodiments, audio component 610 also includes a speaker for outputting audio signals.

[0227] I / O interface 612 provides an interface between processing component 602 and peripheral interface modules, such as keyboards, click wheels, and buttons. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0228] Sensor assembly 614 includes one or more sensors for providing state assessments of various aspects of electronic device 600. For example, sensor assembly 614 may detect the on / off state of electronic device 600, the relative positioning of components such as the display and keypad of electronic device 600, changes in position of electronic device 600 or one of its components, the presence or absence of user contact with electronic device 600, orientation or acceleration / deceleration of electronic device 600, and temperature changes of electronic device 600. Sensor assembly 614 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 614 may also include an optical sensor, such as a complementary metal-oxide-semiconductor (CMOS) or charge-coupled device (CCD) image sensor, for use in imaging applications. In some embodiments, sensor assembly 614 may also include, but is not limited to, at least one of the following: an accelerometer, a gyroscope, a magnetometer, a pressure sensor, and a temperature sensor.

[0229] Communication component 616 is configured to facilitate wired or wireless communication between electronic device 600 and other devices. Electronic device 600 can access wireless networks based on communication standards, such as Wi-Fi, 4G, 5G, or combinations thereof. In one exemplary embodiment, communication component 616 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 616 also includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wide Band (UWB), Bluetooth (BT), and other technologies.

[0230] In an exemplary embodiment, the electronic device 600 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0231] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 604 including executable instructions or a computer program, which can be executed by a processor 620 of an electronic device 600 to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, and optical data storage device, etc.

[0232] A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform any of the battery processing methods described above in the embodiments of this disclosure. For example, the battery processing method includes:

[0233] Based on the target capacity retention rate of the battery and the first mapping relationship, the target internal resistance is obtained; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance.

[0234] Based on the target internal resistance and the second mapping relationship, the number of available charge-discharge cycles of the battery is obtained; wherein, the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

[0235] This disclosure provides a computer program product comprising a computer program or executable instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer program or executable instructions from the computer-readable storage medium and executes the computer program or executable instructions, causing the computer device to perform any of the battery processing methods described above in this disclosure.

[0236] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0237] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery processing method, characterized in that, The method includes: Based on the target capacity retention rate of the battery and the first mapping relationship, the target internal resistance is obtained; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance; Based on the target internal resistance and the second mapping relationship, the number of available charge-discharge cycles of the battery is obtained; wherein, the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

2. The method according to claim 1, characterized in that, The method further includes: The capacity retention rate of the battery under different preset charge-discharge cycles and the internal resistance of the battery under different preset charge-discharge cycles in a preset state of charge are obtained. The first mapping relationship is constructed by fitting each of the capacity retention rates and each of the internal resistances; The second mapping relationship is constructed by fitting each of the internal resistances and each of the preset charge-discharge cycle numbers.

3. The method according to claim 2, characterized in that, The step of obtaining the capacity retention rate of the battery under different preset charge-discharge cycles includes: Obtain the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles; Based on the initial capacity and each of the actual capacities, the capacity retention rate of the battery under each of the preset charge-discharge cycles is obtained.

4. The method according to claim 3, characterized in that, The process of obtaining the initial capacity of the battery and the actual capacity of the battery under different preset charge-discharge cycles includes: The battery is controlled to charge and discharge according to a first charge and discharge strategy to determine the initial capacity; wherein the first charge and discharge strategy instructs the battery to charge to the charging cutoff voltage at a first charging rate during charging and to discharge to the discharging cutoff voltage at a first discharging rate during discharging. While controlling the battery to charge and discharge according to the second charge and discharge strategy to the preset number of charge and discharge cycles, the battery is controlled to continue to charge and discharge according to the first charge and discharge cycle strategy to determine the actual capacity of the battery at the preset number of charge and discharge cycles, until the actual capacity at each preset number of charge and discharge cycles is obtained.

5. The method according to claim 2, characterized in that, The step of obtaining the internal resistance of the battery under a preset state of charge at different preset charge-discharge cycles includes: When the battery is charged and discharged to the preset number of charge and discharge cycles, a first discharge voltage is determined when the battery is in the preset state of charge. When the battery is in the preset state of charge, determine the second discharge voltage when the battery discharges for a first preset time according to the preset discharge current for a preset discharge time; Based on the first discharge voltage, the second discharge voltage, and the preset discharge current, the internal resistance at the preset number of charge-discharge cycles is determined until the internal resistance at each preset number of charge-discharge cycles is obtained.

6. The method according to claim 5, characterized in that, Determining the first discharge voltage when the battery is in the preset state of charge includes: Determine the third discharge voltage when the battery reaches a second preset duration at a second discharge rate; wherein the second discharge rate is determined based on the actual capacity under the preset charge-discharge cycle number; When it is determined that the battery is in the preset state of charge based on the third discharge voltage, the third discharge voltage is determined to be the first discharge voltage; If it is determined that the battery is not in the preset state of charge based on the third discharge voltage, the fourth discharge voltage of the battery being discharged according to the preset discharge current is collected based on the preset collection frequency, and the fourth discharge voltage of the battery being in the preset state of charge is determined as the first discharge voltage.

7. The method according to any one of claims 3 to 6, characterized in that, The method further includes: Based on the internal resistance at each preset charge-discharge cycle number and the actual capacity, the change in internal resistance of the battery at different preset charge-discharge cycle numbers is obtained; wherein, the change in internal resistance characterizes the degree of change in internal resistance within a unit capacity. The step of constructing the first mapping relationship by fitting each of the capacity retention rates and each of the internal resistances includes: The first mapping relationship is constructed by fitting each of the capacity retention rates and each of the internal resistance changes; The step of constructing the second mapping relationship by fitting each of the internal resistances and each of the preset charge-discharge cycle numbers includes: The second mapping relationship is constructed by fitting each of the internal resistance changes and each of the preset charge-discharge cycle numbers.

8. A battery processing device, characterized in that, The device includes: The first determining module is configured to obtain the target internal resistance based on the target capacity retention rate of the battery and a first mapping relationship; wherein, the first mapping relationship is used to indicate the correspondence between the capacity retention rate and the internal resistance; The second determining module is configured to obtain the number of available charge-discharge cycles of the battery based on the target internal resistance and the second mapping relationship; wherein the second mapping relationship is used to indicate the correspondence between the number of charge-discharge cycles and the internal resistance.

9. An electronic device, characterized in that, include: processor; Memory used to store computer programs or instructions; The processor executes the computer program or instructions to implement the steps of the method according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium storing a computer program or instructions, characterized in that, When the computer program or instructions in the storage medium are executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

11. A computer program product, comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed by a processor, they implement the steps of the method according to any one of claims 1 to 7.

Images