Battery charge state calibration method and device, medium and vehicle

Abstract

The invention relates to a battery charge state calibration method and device, a medium and a vehicle. The battery state-of-charge calibration method comprises the following steps: acquiring the current cycle index and the real-time expansion force of a battery; when it is determined that the real-time expansion force under the current cycle number reaches a target value, the current state of charge of the battery is obtained; if the current charge state is located in a target charge state calibration interval, determining a target cycle index calibration interval where the current cycle index is located, and obtaining a standard charge state corresponding to the target charge state calibration interval and the target cycle index calibration interval, under any cycle index in the target cycle index calibration interval, target values in the target charge state calibration interval are unique and correspond to the same standard charge state; and calibrating the current state of charge as a standard state of charge. According to the technical scheme, the charge state of the battery can be accurately calibrated under the charging or discharging working condition.

Description

Technical Field

[0001] 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

[0002] For new energy vehicles, the battery state of charge (SOC) is one of the important states. Accurately estimating the battery state of charge can achieve more efficient use of new energy vehicles and avoid unsafe use of batteries.

[0003] At present, the chronoamperometry is usually used to estimate the battery state of charge. However, the chronoamperometry is inevitably prone to measurement errors, and as the errors accumulate, the deviation between the calculated value and the actual value becomes larger and larger. Therefore, it is necessary to calibrate the battery state of charge in combination with the static voltage to eliminate the influence of the cumulative errors caused by the chronoamperometry.

[0004] However, the static voltage calibration method has great limitations: First, if the platform voltage of the battery is relatively stable, for example, stable at around 3.2V, then within the small voltage range of the battery, it can correspond to a larger range of state of charge. 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 part of the battery tends to be stable, thereby eliminating the influence of battery polarization on the voltage. However, when the battery pack is in a charging or discharging state, it is difficult to calibrate effectively, resulting in a large deviation in the calculation of the state of charge. Summary of the invention

[0005] 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 achieve accurate calibration of the battery state of charge under charging or discharging conditions.

[0006] The present disclosure provides a battery state of charge calibration method, comprising:

[0007] Get the current cycle number and real-time expansion force of the battery;

[0008] 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;

[0009] 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;

[0010] The current state of charge is calibrated to the standard state of charge.

[0011] In the present disclosure, obtaining the current cycle number of the battery includes:

[0012] Obtaining the current total charging capacity of the battery;

[0013] The ratio of the total charging power to the full charge power of the battery is rounded up to obtain the current cycle number.

[0014] In the present disclosure, determining that the real-time expansion force at the current number of cycles reaches a target value includes:

[0015] Get the real-time battery power;

[0016] 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.

[0017] 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:

[0018] 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.

[0019] 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;

[0020] Obtaining a standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval, including:

[0021] Acquire a first standard state of charge corresponding to the first state of charge calibration interval and the first cycle number calibration interval;

[0022] 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.

[0023] 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;

[0024] Obtaining a standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval, including:

[0025] 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.

[0026] 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:

[0027] 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.

[0028] 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;

[0029] Obtaining a standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval, including:

[0030] 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.

[0031] The present disclosure provides a battery state of charge calibration device, comprising:

[0032] A battery parameter acquisition module is used to obtain the current cycle number and real-time expansion force of the battery;

[0033] 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;

[0034] 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;

[0035] The state of charge calibration module is used to calibrate the current state of charge to the standard state of charge.

[0036] 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 of the above methods.

[0037] The present disclosure also provides a vehicle, comprising:

[0038] one or more processors;

[0039] A memory for storing one or more programs or instructions;

[0040] The processor is used to execute the steps of any of the above methods by calling the program or instruction stored in the memory.

[0041] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0042] The technical solution 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 part or all of the cycle numbers of the battery, there are extreme values ​​of the expansion force corresponding to the same state of charge, and the inflection point value of the expansion force corresponding to the same state of charge. Therefore, the embodiment of the present disclosure first obtains the current cycle number and the real-time expansion force of the battery, and determines whether the real-time expansion force under the current cycle number reaches the extreme value or the inflection point value; when it is determined that the real-time expansion force reaches the extreme value or the inflection point value, the current state of charge of the battery is obtained, and based on the comparison between the current state of charge and the calibration interval of the target state of charge, the interference of the inconsistency of the extreme value or the inflection point value (that is, in the correspondence between the expansion force and the state of charge under part or all of the cycle numbers of the battery, the extreme value or the inflection point value of the expansion force corresponds to different states of charge) is eliminated, and only when the current state of charge is in the calibration interval of the target state of charge, the standard state of charge corresponding to the calibration interval of the target state of charge and the calibration interval of the target cycle number in which the current cycle number is located is obtained, that is, the same state of charge corresponding to the extreme value or the inflection point value of the expansion force in the correspondence between the expansion force and the state of charge under part or all of the 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 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, and 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

[0043] 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.

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 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;

[0046] Figure 2 A flow chart of a battery state of charge calibration method provided by an embodiment of the present disclosure;

[0047] Figure 3 A schematic diagram of a curve showing a change in the state of charge and a first differential function of the expansion force of a battery at different cycle times provided by an embodiment of the present disclosure;

[0048] Figure 4A schematic diagram of a change curve of a quadratic differential function of the expansion force of a battery with different cycle times and the state of charge provided by an embodiment of the present disclosure;

[0049] Figure 5 A structural block diagram of a battery state of charge calibration device provided in an embodiment of the present disclosure;

[0050] Figure 6 A schematic diagram of the structure of a vehicle provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0051] 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 in the embodiments can be combined with each other without conflict.

[0052] 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.

[0053] The inventor has found that the reference Figure 1 The change trend of the expansion force and charge state of the battery (the embodiment of the present disclosure takes the lithium iron phosphate battery as an example) at different cycle times is consistent, and from Figure 1 It can be clearly seen that 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 forces at different numbers of cycles are all local maximum values, that is, maximum values. When the state of charge is 0.65 (65%), the expansion forces at different numbers of cycles are all local minimum values, that is, minimum values. When the state of charge is 0.48 (48%), the expansion forces at different numbers of cycles are all inflection point values. Therefore, by limiting the cycle number interval, the unique corresponding state of charge can be determined based on the minimum value, maximum value or inflection point value of the expansion force, that is, within the cycle number interval, the state of charge will not change with the change of the cycle number. Therefore, when calibrating the state of charge of the battery, by determining the state of charge corresponding to the extreme value or inflection point value of the battery's expansion force, the current state of charge can be accurately calibrated with strong real-time performance.

[0054] Specifically, Figure 2This is a flow chart of a battery state of charge calibration method provided by an embodiment of the present disclosure. This method can be applied to the situation where the state of charge of a lithium iron phosphate battery is to be calibrated, and can be applied to the battery in a charging or discharging condition (for example, when a vehicle is driving). This method can be performed by a battery state of charge calibration device, and the battery state of charge calibration device can be implemented in software and / or hardware. Figure 2 As shown, the method comprises the following steps:

[0055] S110, obtaining the current cycle number and real-time expansion force of the battery.

[0056] In the present disclosure, a battery can be regarded as a cycle from being empty (power is 0) to being fully charged, or a battery can be regarded as a cycle from being fully charged to being fully discharged. Considering that in practical applications, the battery generally does not charge from empty to fully charged, nor does it charge from fully charged to being fully discharged when 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 charging power of the battery; rounding up the ratio of the total charging power to the full power of the battery to obtain the current number of cycles. Specifically, the battery management system will accumulate the charging power of the battery, that is, the sum of the historical charging power and the real-time charging power during the current charging process to obtain the current total charging power of the battery; then divide the total charging power by the full power of the battery to obtain a ratio. Since the 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 charging power to the full power of the battery is 99.4, then 99.4 is rounded up to 100, and the current number of cycles is 100. It can be understood 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.

[0057] 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.

[0058] S120. When it is determined that the real-time expansion force under the current number of cycles reaches the target value, the current state of charge of the battery is obtained.

[0059] Among them, the target value includes at least one of an extreme value and an inflection point value, and the extreme value includes a maximum value and a minimum value. The current state of charge can be obtained by a method with estimation errors such as a chronoamperometry. In the embodiment of the present disclosure, the current state of charge can be calibrated only when the real-time expansion force reaches the extreme value; the current state of charge can also be calibrated only when the real-time expansion force reaches the inflection point value; the current state of charge can also be calibrated both when the real-time expansion force reaches the extreme value and when the real-time expansion force reaches the inflection point value; specifically, it can be set according to the error size of estimating the state of charge during the entire charging or discharging process. For example, if the error in estimating the 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 the extreme value or the inflection point value; and if the error in estimating the 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 the extreme value and the inflection point value, respectively. In this way, the state of charge of the battery during the entire charging or discharging process can be made more accurate.

[0060] 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:

[0061] In some embodiments, determining whether the real-time expansion force at the current number of cycles reaches the target value includes: obtaining the real-time power 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 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.

[0062] It should be noted that the real-time power is the real-time remaining power of the battery, and the state of charge reflects the remaining power of the battery. Therefore, the use of the differential function of the battery expansion force with respect to power will not affect the determination of whether the real-time expansion force reaches the target value. The acquired real-time power is more accurate than the estimated state of charge. Therefore, the use of the real-time expansion force to differentiate the real-time power can more accurately determine whether the real-time expansion force under the current number of cycles reaches the target value.

[0063] Specifically, when the battery is charged, the ampere-hour integration method can be used to calculate the battery charging capacity in real time, and the obtained battery charging capacity is the real-time power; when the battery is discharged, the ampere-hour integration method can be used to calculate the battery discharge capacity in real time, and the battery full charge minus the battery discharge capacity is the real-time power. In addition, according to the relationship between the function graph of the battery expansion force with respect to the power and the differential function of the battery expansion force with respect to the power, when the differential function is a first-order differential function, if it is determined that the first differential of the real-time expansion force with respect to the real-time power is equal to 0, it is determined that the real-time expansion force under the current number of cycles has reached an extreme value; and when the differential function is a second-order differential function, if it is determined that the second differential of the real-time expansion force with respect to the real-time power is equal to 0, it is determined that the real-time expansion force under the current number of cycles has reached an inflection point value.

[0064] 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 the standard state of charge corresponding to both the target state of charge calibration interval and the target cycle number calibration interval.

[0065] 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.

[0066] In the disclosed embodiment, the target state of charge calibration interval is used to limit the 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 number of cycles within the target cycle number calibration interval all correspond to the same standard state of charge. Otherwise, when the target value is an invalid target value, that is, the target values ​​at each number of cycles 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 value or inflection point value of the expansion force corresponding to different states of charge in the correspondence between the expansion force at the number of cycles within the target cycle number calibration interval of the battery. The target cycle number calibration interval mainly divides the range of the number of cycles according to the maximum value, so that within the same target cycle number calibration interval, the real-time expansion force at each number of cycles corresponding to the standard state of charge reaches the maximum value.

[0067] In some embodiments, the target state of charge calibration interval is the first state of charge calibration interval, the extreme value is the maximum value, the target cycle number calibration interval includes the first cycle number calibration interval or the 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. Exemplary, reference Figure 1 and Figure 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 (800 times in the figure), and the second standard state of charge is 0.34. It can be understood that the values ​​of the above parameters can be calibrated through experiments, and the values ​​of the calibrated parameters may be different for batteries of different models. When it is determined that the first differential of the real-time expansion force to the real-time charge is equal to 0, that is, dF / dQ=0, if the current state of charge is between 0.2-0.5 and the current number of cycles is less than or equal to 600 times, then according to the pre-calibrated correspondence, 0.36 is directly used as the standard state of charge to calibrate the current state of charge. When it is determined that the first differential of the real-time expansion force to the real-time charge is equal to 0, that is, dF / dQ=0, if the current state of charge is between 0.2-0.5 and the current number of cycles is greater than 600 times, then according to the pre-calibrated corresponding relationship, 0.34 is directly used as the standard state of charge to calibrate the current state of charge.

[0068] 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; 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 third standard state of charge corresponding to the second state of charge calibration interval and the full life cycle of the battery. Figure 1 and Figure 3 , the second state of charge calibration interval is 0.5-0.8, and the third standard state of charge is 0.65. It is understandable that the values ​​of the above parameters can be calibrated through experiments, and the values ​​of the calibrated parameters may be different for different types of batteries. When it is determined that the first differential of the real-time expansion force to the real-time power is equal to 0, that is, dF / dQ=0, if the current state of charge is between 0.5-0.8, then according to the pre-calibrated corresponding relationship, 0.65 is directly used as the standard state of charge to calibrate the current state of charge.

[0069] In some embodiments, the target state of charge calibration interval is the third state of charge calibration interval, the target value is the inflection point value, and the target cycle number calibration interval is 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 fourth standard state of charge corresponding to the third state of charge calibration interval and the full life cycle of the battery. Figure 1 and Figure 4 , the third state of charge calibration interval is 0.4-0.6, and the third standard state of charge is 0.48. It is understandable that the values ​​of the above parameters can be calibrated through experiments, and the values ​​of the calibrated parameters may be different for different types of batteries. When it is determined that the second differential of the real-time expansion force to the real-time charge is equal to 0, that is, d^2F / dQ^2=0, if the current state of charge is between 0.4-0.6, then according to the pre-calibrated corresponding relationship, 0.48 is directly used as the standard state of charge to calibrate the current state of charge.

[0070] S140: Calibrate the current state of charge to a standard state of charge.

[0071] 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 partial or full 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 embodiment of the present disclosure first obtains the current cycle number and the real-time expansion force of the battery, and determines whether the real-time expansion force at the current cycle number reaches an extreme value or an inflection point value; when it is determined that the real-time expansion force reaches an extreme value or an inflection point value, the current state of charge of the battery is obtained, and based on the comparison between the current state of charge and the calibration interval of the target state of charge, the interference of inconsistency of extreme values ​​or inflection point values ​​(that is, in the correspondence between the expansion force and the state of charge at part or all of the cycle numbers of the battery, the extreme values ​​or inflection point values ​​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 standard state of charge corresponding to the calibration interval of the target state of charge and the target cycle number calibration interval where the current cycle number is located is obtained, that is, the same state of charge corresponding to the extreme value or inflection point value of the expansion force in the correspondence between the expansion force and the state of charge at part or all of the 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 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, and 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.

[0072] Corresponding to the battery state of charge calibration method provided by the embodiment of the present disclosure, the embodiment of the present disclosure also provides a battery state of charge calibration device. Figure 5 The structural block diagram of the battery state of charge calibration device provided by the embodiment of the present disclosure is as follows: Figure 5 As shown, the battery state of charge calibration device includes:

[0073] A battery parameter acquisition module 21 is used to obtain the current cycle number and real-time expansion force of the battery;

[0074] 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;

[0075] The second state of charge acquisition module 23 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;

[0076] The state of charge calibration module 24 is used to calibrate the current state of charge to a standard state of charge.

[0077] In some embodiments, the battery parameter acquisition module 21 is specifically used for:

[0078] Get the current total charge capacity of the battery;

[0079] The ratio of the total charging capacity to the full charge capacity of the battery is rounded up to obtain the current cycle number.

[0080] In some embodiments, a target value determination module is further included, which is used to:

[0081] Get the real-time battery power;

[0082] 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.

[0083] In some embodiments, the target value determination module is specifically used to:

[0084] 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.

[0085] 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;

[0086] The second state of charge acquisition module 23 is specifically used for:

[0087] Obtaining a first standard state of charge corresponding to the first state of charge calibration interval and the first cycle number calibration interval;

[0088] 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.

[0089] 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;

[0090] The second state of charge acquisition module 23 is specifically used for:

[0091] 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.

[0092] In some embodiments, the target value determination module is specifically used to:

[0093] 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.

[0094] In some embodiments, 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;

[0095] The second state of charge acquisition module 23 is specifically used for:

[0096] 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.

[0097] 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, which will not be described again here to avoid repetition.

[0098] The embodiment of the present disclosure also provides 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.

[0099] Exemplarily, the program or instructions cause a computer to execute a battery state of charge calibration method, the method comprising:

[0100] Get the current cycle number and real-time expansion force of the battery;

[0101] 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;

[0102] 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 standard state of charge corresponding to the target state of charge calibration interval and the target cycle number calibration interval is 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;

[0103] Calibrate the current state of charge to the standard state of charge.

[0104] 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 to achieve corresponding beneficial effects.

[0105] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the embodiments of the present disclosure can be implemented with the help of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an 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 to enable 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.

[0106] The 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.

[0107] Figure 6 Schematic diagram of the hardware structure of a vehicle provided in an embodiment of the present disclosure. Figure 6As shown, the vehicle includes one or more processors 301 and memory 302 .

[0108] 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.

[0109] The memory 302 may include one or more computer program products, and the computer program product 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, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a 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.

[0110] 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).

[0111] In addition, the input device 303 may also include, for example, a keyboard, a mouse, and the like.

[0112] The output device 304 can output various information to the outside, including the determined distance information, direction information, etc. The output device 304 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0113] Of course, to simplify, Figure 6 Only some of the components in the vehicle related to the present disclosure are shown, and components such as buses, input / output interfaces, etc. are omitted. In addition, the vehicle may further include any other appropriate components according to specific application scenarios.

[0114] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0115] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be 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 will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery state of charge calibration method, characterized in that: include: 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, characterized in that 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, characterized in that 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, characterized in that 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, characterized in that 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: Acquire a first standard state of charge corresponding to 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, characterized in that 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, characterized in that 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, characterized in that 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, characterized in that: include: 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, characterized in that: The computer-readable storage medium stores a program or instruction, and 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, characterized in that: include: 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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