Method and apparatus for calibrating state-of-charge of battery, and medium and vehicle

Abstract

A method and apparatus for calibrating the state-of-charge of a battery, and a medium and a vehicle. The method for calibrating the state-of-charge of a battery comprises: acquiring the current number of cycles and a real-time expansion force of a battery (S110); when it is determined that the real-time expansion force under the current number of cycles reaches a target value, acquiring the current state-of-charge of the battery (S120); if the current state-of-charge is located within a target state-of-charge calibration interval, determining a target number-of-cycle calibration interval, within which the current number of cycles is located, and acquiring a standard state-of-charge corresponding to both the target state-of-charge calibration interval and the target number-of-cycle calibration interval (S130), wherein under any number of cycles within the target number-of-cycle calibration interval, target values within the target state-of-charge calibration interval are unique and all correspond to the same standard state-of-charge; and calibrating the current state-of-charge to the standard state-of-charge (S140).

Description

Battery state of charge calibration method, device, medium and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on October 31, 2023, with application number 202311435152.X and titled “Battery State of Charge Calibration Method, Device, Medium and Vehicle,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular to a battery state of charge calibration method, device, medium and vehicle. Background Art

[0004] For new energy vehicles, the battery's state of charge (SOC) is one of the most important states. Accurately estimating the battery's SOC can achieve more efficient use of new energy vehicles and avoid unsafe use of the battery.

[0005] Currently, the chronoamperometry method is commonly used to estimate the battery's state of charge. However, this method is subject to measurement errors, and as these errors accumulate, the deviation between the calculated value and the actual value becomes increasingly larger. Therefore, it is necessary to calibrate the battery's state of charge in conjunction with the static voltage to eliminate the impact of the cumulative errors introduced by the chronoamperometry method.

[0006] However, the static voltage calibration method has significant limitations: First, if the platform voltage of the battery is relatively stable, for example, stable at around 3.2V, then a larger range of state of charge can be corresponded within a small voltage range of the battery. For example, when the battery voltage is between 3.18V and 3.35V, the corresponding state of charge is 10%-99%. Therefore, even a small error in voltage may have a significant impact on the calibration of the state of charge, making it difficult to obtain the accurate state of charge of the battery through the static voltage calibration method, resulting in inaccurate calibration. Second, the static voltage calibration method requires the battery pack to be in a static state for a long time, so that the internal structure of the battery tends to be stable, thereby eliminating the influence of battery polarization on the voltage. However, it is difficult to calibrate effectively when the battery pack is in a charging or discharging state, resulting in large deviations in the state of charge calculation.

[0007] Summary of the Invention

[0008] In order to solve the above technical problems, the present disclosure provides a battery state of charge calibration method, device, medium and vehicle, so as to accurately calibrate the battery state of charge under charging or discharging conditions.

[0009] The present disclosure provides a battery state of charge calibration method, comprising:

[0010] Get the current cycle count and real-time expansion force of the battery;

[0011] When it is determined that the real-time expansion force at the current number of cycles reaches a target value, obtaining a current state of charge of the battery, wherein the target value includes at least one of an extreme value and an inflection point value;

[0012] If the current state of charge is within the target state of charge calibration interval, determining the target cycle number calibration interval within which the current cycle number is located, and obtaining a standard state of charge corresponding to both the target state of charge calibration interval and the target cycle number calibration interval, wherein, at any cycle number within the target cycle number calibration interval, the target value within the target state of charge calibration interval is unique and corresponds to the same standard state of charge;

[0013] The current state of charge is calibrated to the standard state of charge.

[0014] In the present disclosure, obtaining the current cycle number of the battery includes:

[0015] Obtaining the current total charge capacity of the battery;

[0016] The ratio of the total charging capacity to the full charge capacity of the battery is rounded up to obtain the current cycle number.

[0017] In the present disclosure, determining that the real-time expansion force at the current number of cycles reaches the target value includes:

[0018] Get the real-time battery power;

[0019] When it is determined that the differential of the real-time expansion force with respect to the real-time power is equal to 0 based on the differential function of the battery expansion force with respect to the power at the current cycle number, it is determined that the real-time expansion force at the current cycle number reaches the target value.

[0020] In the present disclosure, when it is determined that the differential of the real-time expansion force with respect to the real-time power is equal to 0 based on the differential function of the battery expansion force with respect to the power at the current cycle number, determining that the real-time expansion force at the current cycle number reaches the target value includes:

[0021] In the case where the differential function is a first-order differential function, if it is determined that the first-order differential of the real-time expansion force with respect to the real-time electric quantity is equal to 0, it is determined that the real-time expansion force at the current number of cycles reaches an extreme value.

[0022] In the present disclosure, the target state of charge calibration interval is a first state of charge calibration interval, the extreme value is a maximum value, the target cycle number calibration interval includes a first cycle number calibration interval or a second cycle number calibration interval, and the first cycle number calibration interval and the second cycle number calibration interval constitute the full life cycle of the battery;

[0023] Obtaining a standard state of charge corresponding to both the target state of charge calibration interval and the target cycle number calibration interval includes:

[0024] Obtaining a first standard state of charge corresponding to both the first state of charge calibration interval and the first cycle number calibration interval;

[0025] Alternatively, a second standard state of charge corresponding to both the first state of charge calibration interval and the second cycle number calibration interval is obtained.

[0026] In the present disclosure, the target state of charge calibration interval is the second state of charge calibration interval, the extreme value is the minimum value, and the target cycle number calibration interval is the full life cycle of the battery;

[0027] Obtaining a standard state of charge corresponding to both the target state of charge calibration interval and the target cycle number calibration interval includes:

[0028] A third standard state of charge corresponding to the second state of charge calibration interval and the full life cycle of the battery is obtained.

[0029] In the present disclosure, when it is determined that the differential of the real-time expansion force with respect to the real-time power is equal to 0 based on the differential function of the battery expansion force with respect to the power at the current cycle number, determining that the real-time expansion force at the current cycle number reaches the target value includes:

[0030] In the case where the differential function is a quadratic differential function, if it is determined that the quadratic differential of the real-time expansion force with respect to the real-time electric quantity is equal to 0, it is determined that the real-time expansion force at the current number of cycles reaches an inflection point value.

[0031] In the present disclosure, the target state of charge calibration interval is the third state of charge calibration interval, and the target cycle number calibration interval is the full life cycle of the battery;

[0032] Obtaining a standard state of charge corresponding to both the target state of charge calibration interval and the target cycle number calibration interval includes:

[0033] A fourth standard state of charge corresponding to the third state of charge calibration interval and the entire life cycle of the battery is obtained.

[0034] The present disclosure provides a battery state of charge calibration device, comprising:

[0035] Battery parameter acquisition module, used to obtain the current cycle number and real-time expansion force of the battery;

[0036] a first state of charge acquisition module, configured to acquire a current state of charge of the battery when it is determined that the real-time expansion force at the current number of cycles reaches a target value, wherein the target value includes at least one of an extreme value and an inflection point value;

[0037] a second state-of-charge acquisition module, configured to, if the current state-of-charge is within a target state-of-charge calibration interval, determine the target cycle number calibration interval within which the current cycle number is located, and acquire the target state-of-charge calibration interval and a standard state-of-charge corresponding to both the target cycle number calibration interval, wherein, at any cycle number within the target cycle number calibration interval, the target value within the target state-of-charge calibration interval is unique and corresponds to the same standard state-of-charge;

[0038] The state of charge calibration module is configured to calibrate the current state of charge to the standard state of charge.

[0039] The present disclosure also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a program or instruction, wherein the program or instruction enables a computer to execute the steps of any one of the above methods.

[0040] The present disclosure also provides a vehicle, comprising:

[0041] one or more processors;

[0042] a memory for storing one or more programs or instructions;

[0043] The processor is configured to execute the steps of any of the above methods by calling the program or instructions stored in the memory.

[0044] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0045] The technical solution provided by the disclosed embodiments takes into account that, in the correspondence between the expansion force and the state of charge (SOC) for a portion or all of the battery's cycle counts, extreme expansion force values ​​correspond to the same SOC, as do inflection points in the expansion force. Therefore, the disclosed embodiments first obtain the battery's current cycle count and real-time expansion force, then determine whether the real-time expansion force at the current cycle count has reached an extreme value or inflection point. Upon determining that the real-time expansion force has reached an extreme value or inflection point, the battery's current SOC is then obtained. Based on a comparison of the current SOC with a target SOC calibration interval, the interference from inconsistent extreme values ​​or inflection points (i.e., extreme values ​​or inflection points in the correspondence between the expansion force and the SOC for a portion or all of the battery's cycle counts) is eliminated. Only when the current SOC falls within the target SOC calibration interval is the target SOC calibration interval and the standard SOC corresponding to the target cycle calibration interval within which the current cycle count falls are obtained. This means that the same SOC corresponding to the extreme value or inflection point in the correspondence between the expansion force and the SOC for a portion or all of the battery's cycle counts is obtained. In this way, based on the expansion force of the battery, the corresponding standard state of charge can be quickly and accurately determined, so that the battery's state of charge can be accurately calibrated using the standard state of charge. There is no need to leave the battery stationary for a long time. The state of charge can be effectively calibrated when the battery pack is in a charging or discharging state, which is suitable for charging or discharging conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0047] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] FIG1 is a schematic diagram of a curve showing changes in expansion force and state of charge of a battery at different cycle times provided by an embodiment of the present disclosure;

[0049] FIG2 is a flow chart of a battery state of charge calibration method provided by an embodiment of the present disclosure;

[0050] FIG3 is a schematic diagram of a curve showing a first differential function of expansion force with respect to charge quantity and state of charge at different cycle times of a battery provided by an embodiment of the present disclosure;

[0051] FIG4 is a schematic diagram of a curve showing a quadratic differential function of expansion force with respect to charge and state of charge at different cycle times of a battery provided by an embodiment of the present disclosure;

[0052] FIG5 is a structural block diagram of a battery state of charge calibration device provided by an embodiment of the present disclosure;

[0053] FIG6 is a schematic structural diagram of a vehicle provided in an embodiment of the present disclosure. Specific embodiments

[0054] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0056] The inventors have found that, referring to Figure 1, the expansion force and state of charge curves of the battery (a lithium iron phosphate battery is used as an example in the embodiment of the present disclosure) at different cycle numbers have consistent changing trends. As can be clearly seen from Figure 1, when the state of charge is around 0.35 (35%) (when the number of cycles is less than or equal to 600, the state of charge is 0.36, and when the number of cycles is greater than 600, the state of charge is 0.34), the expansion force at different cycle numbers is a local maximum, i.e., a maximum value. When the state of charge is 0.65 (65%), the expansion force at different cycle numbers is a local minimum, i.e., a minimum value. When the state of charge is 0.48 (48%), the expansion force at different cycle numbers is an inflection point value. Therefore, by limiting the cycle number interval, a unique corresponding state of charge can be determined based on the minimum, maximum, or inflection point value of the expansion force, i.e., within the cycle number interval, the state of charge does not change with the change of the cycle number. Therefore, when calibrating the battery's state of charge, by determining the state of charge corresponding to the battery's expansion force reaching an extreme value or an inflection point value, the current state of charge can be accurately calibrated with strong real-time performance.

[0057] Specifically, FIG2 is a flow chart of a battery state of charge calibration method provided by an embodiment of the present disclosure. This method is applicable to the situation where the state of charge of a lithium iron phosphate battery is calibrated, and can be applied when the battery is in a charging or discharging state (for example, when a vehicle is driving). This method can be performed by a battery state of charge calibration device, which can be implemented in software and / or hardware. As shown in FIG2, the method includes the following steps:

[0058] S110 : Obtain the current cycle number and real-time expansion force of the battery.

[0059] In the present disclosure, a battery's charge from zero to full charge can be considered as one cycle, or a battery's charge from full charge to full discharge can be considered as one cycle. Considering that in actual applications, a battery generally does not charge from zero to full charge, nor does it charge from full charge to full discharge during charging. Therefore, in order to accurately obtain the current number of cycles of the battery, in some embodiments, obtaining the current number of cycles of the battery includes: obtaining the current total charge capacity of the battery; rounding up the ratio of the total charge capacity to the full charge capacity of the battery to obtain the current number of cycles. Specifically, the battery management system accumulates the charge capacity of the battery, that is, the sum of the historical charge capacity and the real-time charge capacity during the current charging process to obtain the current total charge capacity of the battery; then divides the total charge capacity by the full charge capacity of the battery to obtain a ratio. Since this ratio is mostly not an integer, the ratio should be rounded up to obtain the current number of cycles. For example, if the ratio of the total charge capacity to the full charge capacity of the battery is 99.4, then 99.4 is rounded up to 100, and the current number of cycles is 100. It is understandable that the above example uses charging as an example to calculate the current cycle number. Similarly, in other examples, the current cycle number can also be calculated based on the total discharged power.

[0060] In addition, a pressure sensor, such as a piezoresistive thin film pressure sensor, may be provided inside the battery to collect the real-time expansion force of the battery and transmit the real-time expansion force to the battery management system.

[0061] S120 . When it is determined that the real-time expansion force under the current number of cycles reaches the target value, obtain the current state of charge of the battery.

[0062] The target value includes at least one of an extreme value and an inflection point value, and extreme values ​​include a maximum value and a minimum value. The current state of charge can be obtained using methods such as the chronoamperometry method, which may have estimation errors. In the disclosed embodiments, the current state of charge can be calibrated only when the real-time expansion force reaches an extreme value; or only when the real-time expansion force reaches an inflection point value; or both when the real-time expansion force reaches an extreme value and when the real-time expansion force reaches an inflection point value. The specific setting can be based on the error in the estimated state of charge during the entire charging or discharging process. For example, if the error in the estimated state of charge during the entire charging or discharging process is small, the current state of charge can be calibrated only when the real-time expansion force reaches an extreme value or an inflection point value. If the error in the estimated state of charge during the entire charging or discharging process is large, the current state of charge should be calibrated when the real-time expansion force reaches both an extreme value and an inflection point value. In this way, the battery's state of charge can be more accurate throughout the entire charging or discharging process.

[0063] In order to accurately determine whether the real-time expansion force under the current number of cycles reaches the target value, and to distinguish whether the target value is an extreme value or an inflection point value, the present disclosure provides the following embodiments:

[0064] In some embodiments, determining whether the real-time expansion force at the current number of cycles reaches a target value includes: obtaining the real-time power level of the battery; and determining that the real-time expansion force at the current number of cycles reaches the target value when the differential of the real-time expansion force with respect to the real-time power level is equal to 0 based on a differential function of the battery expansion force at the current number of cycles with respect to the power level.

[0065] It's important to note that the real-time charge level represents the battery's actual remaining charge, while the SOC reflects the remaining charge. Therefore, using the differential function of the battery's expansion force with respect to charge level does not affect the determination of whether the real-time expansion force has reached the target value. The acquired real-time charge level is more accurate than the estimated SOC. Therefore, using the real-time expansion force to differentiate the real-time charge level more accurately determines whether the real-time expansion force has reached the target value for the current number of cycles.

[0066] Specifically, when the battery is charging, the ampere-hour integration method can be used to calculate the battery charging capacity in real time. The obtained battery charging capacity is the real-time battery capacity. When the battery is discharging, the ampere-hour integration method can be used to calculate the battery discharge capacity in real time. The real-time battery capacity is calculated by subtracting the battery discharge capacity from the full battery capacity. Furthermore, based on the relationship between the graph of the battery expansion force with respect to the battery capacity and the differential function of the battery expansion force with respect to the battery capacity, if the differential function is a first-order differential function, if the first differential of the real-time expansion force with respect to the real-time battery capacity is determined to be 0, then the real-time expansion force at the current cycle number has reached its extreme value. If the differential function is a second-order differential function, if the second differential of the real-time expansion force with respect to the real-time battery capacity is determined to be 0, then the real-time expansion force at the current cycle number has reached its inflection point value.

[0067] S130: If the current state of charge is within the target state of charge calibration interval, determine the target cycle number calibration interval within which the current cycle number is located, and obtain a standard state of charge corresponding to both the target state of charge calibration interval and the target cycle number calibration interval.

[0068] Among them, at any cycle number within the target cycle number calibration interval, the target value located in the target state of charge calibration interval is unique and corresponds to the same standard state of charge.

[0069] In the embodiment of the present disclosure, the target state of charge calibration interval is used to limit the landing range of the standard state of charge. Only when the current state of charge is within the target state of charge calibration interval can the target value be determined to be a valid target value, that is, the target values ​​at each cycle number within the target cycle number calibration interval all correspond to the same standard state of charge. Otherwise, if the target value is an invalid target value, that is, the target values ​​at each cycle number within the target cycle number calibration interval correspond to different states of charge, it will continue to be judged whether the real-time expansion force reaches the target value. By setting the target state of charge calibration interval, it is used to eliminate the interference of the extreme values ​​or inflection point values ​​of the expansion force corresponding to different states of charge in the correspondence between the expansion force at the cycle number within the target cycle number calibration interval of the battery. The target cycle number calibration interval mainly divides the range of cycle numbers according to the maximum value, so that within the same target cycle number calibration interval, the real-time expansion force at each cycle number corresponding to the standard state of charge reaches the maximum value.

[0070] In some embodiments, the target state of charge calibration interval is a first state of charge calibration interval, the extreme value is a maximum value, the target cycle number calibration interval includes a first cycle number calibration interval or a second cycle number calibration interval, and the first cycle number calibration interval and the second cycle number calibration interval constitute the full life cycle of the battery; obtaining the standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval includes: obtaining the first standard state of charge corresponding to the first state of charge calibration interval and the first cycle number calibration interval; or, obtaining the second standard state of charge corresponding to the first state of charge calibration interval and the second cycle number calibration interval. Exemplarily, with reference to Figures 1 and 3, the first state of charge calibration interval is 0.2-0.5, the first cycle number calibration interval is 0-600 times, the first standard state of charge is 0.36, the first cycle number calibration interval is greater than 600 times (illustrated as 800 times in the figure), and the second standard state of charge is 0.34. It is understood that the values ​​of the above parameters can be calibrated through experiments, and the values ​​of the calibrated parameters may vary for different battery models. When the first differential of the real-time expansion force with respect to the real-time charge is determined to be equal to 0, that is, when dF / dQ = 0, if the current SOC is between 0.2-0.5 and the current number of cycles is less than or equal to 600, then, based on the pre-calibrated correspondence, 0.36 is directly used as the standard SOC to calibrate the current SOC. When the first differential of the real-time expansion force with respect to the real-time charge is determined to be equal to 0, that is, when dF / dQ = 0, if the current SOC is between 0.2-0.5 and the current number of cycles is greater than 600, then, based on the pre-calibrated correspondence, 0.34 is directly used as the standard SOC to calibrate the current SOC.

[0071] In some embodiments, the target SOC calibration interval is a second SOC calibration interval, the extreme value is a minimum value, and the target cycle count calibration interval is the entire life cycle of the battery. Obtaining the standard SOC corresponding to both the target SOC calibration interval and the target cycle count calibration interval includes obtaining a third standard SOC corresponding to both the second SOC calibration interval and the entire life cycle of the battery. For example, with continued reference to Figures 1 and 3, the second SOC calibration interval is 0.5-0.8, and the third standard SOC is 0.65. It is understood that the values ​​of the aforementioned parameters can be calibrated experimentally, and the values ​​of the calibrated parameters may vary for different battery models. When the first differential of the real-time expansion force with respect to the real-time charge is determined to be zero, i.e., dF / dQ = 0, if the current SOC is between 0.5-0.8, then, based on the pre-calibrated correspondence, 0.65 is directly used as the standard SOC to calibrate the current SOC.

[0072] In some embodiments, the target SOC calibration interval is a third SOC calibration interval, the target value is an inflection point value, and the target cycle count calibration interval is the full life cycle of the battery; obtaining the standard SOC corresponding to both the target SOC calibration interval and the target cycle count calibration interval includes obtaining a fourth standard SOC corresponding to both the third SOC calibration interval and the full life cycle of the battery. For example, with reference to Figures 1 and 4, the third SOC calibration interval is 0.4-0.6, and the third standard SOC is 0.48. It is understood that the values ​​of the above parameters can be calibrated experimentally, and the values ​​of the calibrated parameters may vary for different battery models. When it is determined that the second differential of the real-time expansion force with respect to the real-time charge is equal to 0, that is, when d^2F / dQ^2=0, if the current SOC is between 0.4-0.6, then, based on the pre-calibrated correspondence, 0.48 is directly used as the standard SOC to calibrate the current SOC.

[0073] S140: Calibrate the current state of charge to a standard state of charge.

[0074] In summary, the battery state of charge calibration method provided by the embodiment of the present disclosure takes into account that in the correspondence between the expansion force and the state of charge under some or all cycle times of the battery, there are extreme values ​​of the expansion force corresponding to the same state of charge, and inflection point values ​​of the expansion force corresponding to the same state of charge. Therefore, the disclosed embodiment first obtains the current cycle number and real-time expansion force of the battery, and determines whether the real-time expansion force at the current cycle number has reached an extreme value or an inflection point. When it is determined that the real-time expansion force has reached an extreme value or an inflection point, the current state of charge of the battery is then obtained. Based on a comparison of the current state of charge with a calibration interval of the target state of charge, interference from inconsistent extreme values ​​or inflection points (i.e., in the correspondence between the expansion force and the state of charge at some or all cycle numbers of the battery, the extreme values ​​or inflection points of the expansion force correspond to different states of charge) is eliminated. Only when the current state of charge is within the calibration interval of the target state of charge, the target state of charge calibration interval and the standard state of charge corresponding to the target cycle number calibration interval within which the current cycle number falls are obtained. In other words, the same state of charge corresponding to the extreme value or inflection point of the expansion force in the correspondence between the expansion force and the state of charge at some or all cycle numbers of the battery is obtained. In this way, based on the expansion force of the battery, the corresponding standard state of charge can be quickly and accurately determined, so that the battery's state of charge can be accurately calibrated using the standard state of charge. There is no need to leave the battery stationary for a long time. The state of charge can be effectively calibrated when the battery pack is in a charging or discharging state, which is suitable for charging or discharging conditions.

[0075] Corresponding to the battery state of charge calibration method provided in the embodiment of the present disclosure, the embodiment of the present disclosure also provides a battery state of charge calibration device. FIG5 is a structural block diagram of the battery state of charge calibration device provided in the embodiment of the present disclosure. As shown in FIG5 , the battery state of charge calibration device includes:

[0076] A battery parameter acquisition module 21 is used to obtain the current cycle number and real-time expansion force of the battery;

[0077] a first state of charge acquisition module 22, configured to acquire the current state of charge of the battery when it is determined that the real-time expansion force under the current number of cycles reaches a target value, wherein the target value includes at least one of an extreme value and an inflection point value;

[0078] a second state-of-charge acquisition module 23 configured to, if the current state of charge is within the target state-of-charge calibration interval, determine the target cycle number calibration interval within which the current cycle number is located, and obtain a standard state-of-charge corresponding to both the target state-of-charge calibration interval and the target cycle number calibration interval, wherein, at any cycle number within the target cycle number calibration interval, the target value within the target state-of-charge calibration interval is unique and corresponds to the same standard state-of-charge;

[0079] The state of charge calibration module 24 is configured to calibrate the current state of charge to a standard state of charge.

[0080] In some embodiments, the battery parameter acquisition module 21 is specifically configured to:

[0081] Get the current total charge capacity of the battery;

[0082] The ratio of the total charge capacity to the full charge capacity of the battery is rounded up to obtain the current cycle number.

[0083] In some embodiments, the system further includes a target value determination module for:

[0084] Get the real-time battery power;

[0085] When it is determined that the differential of the real-time expansion force with respect to the real-time charge is equal to 0 based on the differential function of the battery expansion force with respect to the charge at the current cycle number, it is determined that the real-time expansion force at the current cycle number reaches the target value.

[0086] In some embodiments, the target value determination module is specifically configured to:

[0087] In the case where the differential function is a first-order differential function, if it is determined that the first-order differential of the real-time expansion force with respect to the real-time electric quantity is equal to 0, it is determined that the real-time expansion force at the current number of cycles reaches an extreme value.

[0088] In some embodiments, the target state of charge calibration interval is a first state of charge calibration interval, the extreme value is a maximum value, the target cycle number calibration interval includes a first cycle number calibration interval or a second cycle number calibration interval, and the first cycle number calibration interval and the second cycle number calibration interval constitute the full life cycle of the battery;

[0089] The second state of charge acquisition module 23 is specifically configured to:

[0090] Obtaining a first standard state of charge corresponding to both the first state of charge calibration interval and the first cycle number calibration interval;

[0091] Alternatively, a second standard state of charge corresponding to both the first state of charge calibration interval and the second cycle number calibration interval is obtained.

[0092] In some embodiments, the target state of charge calibration interval is the second state of charge calibration interval, the extreme value is the minimum value, and the target cycle number calibration interval is the full life cycle of the battery;

[0093] The second state of charge acquisition module 23 is specifically configured to:

[0094] A third standard state of charge corresponding to the second state of charge calibration interval and the entire life cycle of the battery is obtained.

[0095] In some embodiments, the target value determination module is specifically configured to:

[0096] In the case where the differential function is a quadratic differential function, if it is determined that the quadratic differential of the real-time expansion force with respect to the real-time electric quantity is equal to 0, it is determined that the real-time expansion force at the current number of cycles reaches the inflection point value.

[0097] In some embodiments, the target state of charge calibration interval is the third state of charge calibration interval, and the target cycle number calibration interval is the full life cycle of the battery;

[0098] The second state of charge acquisition module 23 is specifically configured to:

[0099] A fourth standard state of charge corresponding to the third state of charge calibration interval and the entire life cycle of the battery is obtained.

[0100] The battery state of charge calibration device disclosed in the above embodiments can execute the battery state of charge calibration method disclosed in the above embodiments, and has the same or corresponding beneficial effects. To avoid repetition, they will not be described again here.

[0101] The embodiments of the present disclosure further provide a computer-readable storage medium, which stores a program or instruction, and the program or instruction enables a computer to execute the steps of any of the above methods.

[0102] Exemplarily, the program or instructions cause a computer to execute a battery state of charge calibration method, the method comprising:

[0103] Get the current cycle count and real-time expansion force of the battery;

[0104] When it is determined that the real-time expansion force at the current number of cycles reaches a target value, obtaining a current state of charge of the battery, wherein the target value includes at least one of an extreme value and an inflection point value;

[0105] If the current state of charge is within the target state of charge calibration interval, determining the target cycle number calibration interval within which the current cycle number is located, and obtaining the standard state of charge corresponding to both the target state of charge calibration interval and the target cycle number calibration interval, wherein, at any cycle number within the target cycle number calibration interval, the target value within the target state of charge calibration interval is unique and corresponds to the same standard state of charge;

[0106] Calibrate the current state of charge to the standard state of charge.

[0107] Optionally, when executed by a computer processor, the computer executable instructions may also be used to execute the technical solution of any of the above-mentioned battery state of charge calibration methods provided in the embodiments of the present disclosure, thereby achieving corresponding beneficial effects.

[0108] Through the above description of the implementation methods, those skilled in the art can clearly understand that the embodiments of the present disclosure can be implemented with the help of software and necessary general-purpose hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the embodiments of the present disclosure is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment of the present disclosure.

[0109] An embodiment of the present disclosure also provides a vehicle, comprising: one or more processors; a memory for storing one or more programs or instructions; the processor calls the programs or instructions stored in the memory to execute the steps of any of the above methods to achieve corresponding beneficial effects.

[0110] FIG6 is a schematic diagram of the hardware structure of a vehicle provided by an embodiment of the present disclosure. As shown in FIG6 , the vehicle includes one or more processors 301 and a memory 302 .

[0111] The processor 301 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the vehicle to perform desired functions.

[0112] The memory 302 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 301 may execute the program instructions to implement the battery state of charge calibration method of the embodiment of the present disclosure described above, and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage medium.

[0113] In one example, the vehicle may further include an input device 303 and an output device 304 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0114] In addition, the input device 303 may also include, for example, a keyboard, a mouse, and the like.

[0115] The output device 304 can output various information to the outside, including determined distance information, direction information, etc. The output device 304 can include, for example, a display, a speaker, a printer, a communication network and its connected remote output device, etc.

[0116] Of course, for the sake of simplicity, FIG6 only shows some of the components in the vehicle related to the present disclosure, omitting components such as buses, input / output interfaces, etc. In addition, the vehicle may further include any other appropriate components depending on the specific application.

[0117] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0118] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A battery state of charge calibration method, comprising: Get the current cycle number and real-time expansion force of the battery; When it is determined that the real-time expansion force at the current number of cycles reaches a target value, obtaining a current state of charge of the battery, wherein the target value includes at least one of an extreme value and an inflection point value; If the current state of charge is within the target state of charge calibration interval, the target cycle number calibration interval in which the current cycle number is located is determined, and the target state of charge calibration interval and the standard state of charge corresponding to the target cycle number calibration interval are obtained, wherein, at any cycle number within the target cycle number calibration interval, the target value within the target state of charge calibration interval is unique and corresponds to the same standard state of charge; The current state of charge is calibrated to the standard state of charge.

2. The method according to claim 1, wherein: Get the current cycle count of the battery, including: Obtaining the current total charging capacity of the battery; The ratio of the total charging power to the full charge power of the battery is rounded up to obtain the current cycle number.

3. The method according to claim 1, wherein: Determining that the real-time expansion force at the current number of cycles reaches a target value includes: Get the real-time battery power; When it is determined that the differential of the real-time expansion force with respect to the real-time power is equal to 0 based on the differential function of the battery expansion force with respect to the power at the current cycle number, it is determined that the real-time expansion force at the current cycle number reaches the target value.

4. The method according to claim 3, wherein: When it is determined that the differential of the real-time expansion force with respect to the real-time power is equal to 0 based on the differential function of the battery expansion force with respect to the power at the current cycle number, determining that the real-time expansion force at the current cycle number reaches the target value includes: In the case where the differential function is a first-order differential function, if it is determined that the first-order differential of the real-time expansion force with respect to the real-time electric quantity is equal to 0, it is determined that the real-time expansion force at the current number of cycles reaches an extreme value.

5. The method according to claim 4, wherein: The target state of charge calibration interval is a first state of charge calibration interval, the extreme value is a maximum value, the target cycle number calibration interval includes a first cycle number calibration interval or a second cycle number calibration interval, and the first cycle number calibration interval and the second cycle number calibration interval constitute the full life cycle of the battery; Obtaining a standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval, including: Obtaining a first standard state of charge corresponding to both the first state of charge calibration interval and the first cycle number calibration interval; Alternatively, a second standard state of charge corresponding to both the first state of charge calibration interval and the second cycle number calibration interval is obtained.

6. The method according to claim 4, wherein: The target state of charge calibration interval is a second state of charge calibration interval, the extreme value is a minimum value, and the target cycle number calibration interval is the full life cycle of the battery; Obtaining a standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval, including: A third standard state of charge corresponding to the second state of charge calibration interval and the full life cycle of the battery is obtained.

7. The method according to claim 3, wherein: When it is determined that the differential of the real-time expansion force with respect to the real-time power is equal to 0 based on the differential function of the battery expansion force with respect to the power at the current cycle number, determining that the real-time expansion force at the current cycle number reaches the target value includes: In the case where the differential function is a quadratic differential function, if it is determined that the quadratic differential of the real-time expansion force with respect to the real-time electric quantity is equal to 0, it is determined that the real-time expansion force at the current number of cycles reaches an inflection point value.

8. The method according to claim 7, wherein: The target state of charge calibration interval is a third state of charge calibration interval, and the target cycle number calibration interval is the full life cycle of the battery; Obtaining a standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval, including: A fourth standard state of charge corresponding to the third state of charge calibration interval and the entire life cycle of the battery is obtained.

9. A battery state of charge calibration device, comprising: A battery parameter acquisition module is used to obtain the current cycle number and real-time expansion force of the battery; A first state of charge acquisition module, configured to acquire a current state of charge of the battery when it is determined that the real-time expansion force at the current number of cycles reaches a target value, wherein the target value includes at least one of an extreme value and an inflection point value; A second state of charge acquisition module is used to determine the target cycle number calibration interval in which the current cycle number is located if the current state of charge is within the target state of charge calibration interval, and to obtain the target state of charge calibration interval and the standard state of charge corresponding to the target cycle number calibration interval, wherein, at any cycle number within the target cycle number calibration interval, the target value within the target state of charge calibration interval is unique and corresponds to the same standard state of charge; The state of charge calibration module is used to calibrate the current state of charge to the standard state of charge.

10. A computer-readable storage medium storing a program or instruction, wherein the program or instruction enables a computer to execute the steps of the method according to any one of claims 1 to 8.

11. A vehicle comprising: one or more processors; A memory for storing one or more programs or instructions; The processor is used to execute the steps of the method according to any one of claims 1 to 8 by calling the program or instruction stored in the memory.

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