Method and device for calibrating electric quantity of vehicle battery

Abstract

The invention discloses a method and device for calibrating the electric quantity of a vehicle battery, and relates to the technical field of vehicles. The specific implementation mode of the method comprises the following steps: in response to determining that a vehicle battery enters a standing state, determining a theoretical electric quantity value corresponding to a first moment when standing of the battery begins, and monitoring the voltage of the battery in the standing process; determining that the standing type of the battery belongs to standing after charging or standing after discharging according to the monitored change condition of the voltage of the battery in the target time period; a difference value between a second moment corresponding to the starting point of the target time period and the first moment is not less than a first threshold value; determining a corresponding target voltage value when the standing of the battery is finished; searching a target electric quantity value corresponding to the target voltage value in corresponding preset reference data; and calibrating the theoretical electric quantity value according to the target electric quantity value. According to the embodiment, the accuracy of judging the standing type is improved, the target electric quantity value is closer to the real electric quantity of the battery, and the calibration precision of the electric quantity of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method and device for calibrating the battery power of a vehicle. Background Art

[0002] Theoretically, the battery charge calibration is to determine the calibrated charge using the open circuit voltage-state of charge curve after charging. And after discharging, the calibrated charge is determined using the open circuit voltage-state of charge curve after discharging. However, for the battery of an electric vehicle, the charging and discharging process is frequently alternating or performed simultaneously, and it is impossible to accurately determine whether the battery is in the discharging process or the charging process before the battery is left at rest. Therefore, according to the above theory, it is impossible to accurately calibrate the charge of the vehicle battery. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a vehicle battery power calibration method and device, which determines whether the battery's current rest is rest after charging or rest after discharging by monitoring the change in battery voltage in a target period of time during rest, selects corresponding reference data according to the determined rest type, searches for the corresponding power value in the reference data according to the stable voltage value obtained after the battery has been rested, and calibrates the theoretical power value based on the power value found, thereby improving the accuracy of the rest type judgment, and further making the target power value closer to the actual power of the battery, thereby improving the calibration accuracy of the battery power.

[0004] To achieve the above objective, according to one aspect of an embodiment of the present invention, a method for calibrating the battery power of a vehicle is provided.

[0005] A vehicle battery power calibration method according to an embodiment of the present invention comprises: in response to determining that a vehicle battery enters a static state, determining a theoretical power value of the battery corresponding to a first moment when the static state begins, and monitoring the voltage of the battery during the static state;

[0006] Determining whether the static type of the battery is static after charging or static after discharging according to the monitored change of the voltage of the battery within the target time period; the difference between the second moment corresponding to the starting point of the target time period and the first moment is not less than a first threshold;

[0007] Determining a target voltage value corresponding to the battery at the end of standing;

[0008] Searching for a target power value corresponding to a target voltage value in preset reference data corresponding to the static type to which the battery belongs;

[0009] The theoretical power value is calibrated according to the target power value.

[0010] Optionally, the first threshold is obtained based on experimental data statistics;

[0011] The experimental data is obtained by performing a static experiment on multiple batteries for a preset number of times, and different types of charge and discharge operations are performed on the multiple batteries within a first preset time period before the static experiment begins;

[0012] The types of charge and discharge operations include: charging, discharging, charging first and then discharging, and discharging first and then charging.

[0013] Optionally, determining, according to the monitored change of the voltage of the battery within the target time period, whether the static type of the battery is static after charging or static after discharging includes:

[0014] Determining the target time period according to the first moment and the first threshold;

[0015] Determining a variation trend of the voltage of the battery within the target time period;

[0016] The static type of the battery is determined according to the change trend.

[0017] Optionally, determining the target time period according to the first moment and the first threshold includes:

[0018] Determine a sum of the first moment and the first threshold as a target moment;

[0019] A rest period after the target time is determined as the target period.

[0020] Optionally, determining the static type of the battery according to the change trend includes:

[0021] When the change trend is a non-downward trend, determining that the static type of the battery is static after discharge;

[0022] When the change trend is a non-increasing trend, it is determined that the static type of the battery is static after charging.

[0023] Optionally, determining a target voltage value corresponding to the battery at the end of standing includes:

[0024] Monitoring the change in the battery voltage within a second preset time period;

[0025] determining whether the change value is less than a second threshold;

[0026] When the change value is smaller than the second threshold, monitoring the voltage of the battery is stopped, and the current voltage of the battery is determined as the target voltage value.

[0027] Optionally, the preset reference data is data of a corresponding relationship between the voltage and the state of charge of the battery;

[0028] and / or,

[0029] The preset reference data is in the form of a table and / or a graph.

[0030] To achieve the above objective, according to another aspect of an embodiment of the present invention, a device for calibrating the battery power of a vehicle is provided.

[0031] A vehicle battery power calibration device according to an embodiment of the present invention includes:

[0032] A static module, configured to, in response to determining that the vehicle battery enters a static state, determine a theoretical power value of the battery corresponding to a first moment of the start of the static state, and monitor a voltage of the battery during the static state;

[0033] A monitoring module, configured to determine whether the rest type of the battery is rest after charging or rest after discharging according to the monitored change of the voltage of the battery within the target period; the difference between the second moment corresponding to the starting point of the target period and the first moment is not less than a first threshold; and determine a target voltage value corresponding to the battery at the end of rest;

[0034] A search module, used to search for a target power value corresponding to a target voltage value in preset reference data corresponding to a static type to which the battery belongs;

[0035] The calibration module is used to calibrate the theoretical power value according to the target power value.

[0036] To achieve the above objective, according to another aspect of an embodiment of the present invention, an electronic device for calibrating the battery power of a vehicle is provided.

[0037] An electronic device for calibrating the battery power of a vehicle according to an embodiment of the present invention includes: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement a method for calibrating the battery power of a vehicle according to an embodiment of the present invention.

[0038] To achieve the above objective, according to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided.

[0039] A computer-readable storage medium according to an embodiment of the present invention stores a computer program, which, when executed by a processor, implements a vehicle battery power calibration method according to an embodiment of the present invention.

[0040] An embodiment of the above invention has the following advantages or beneficial effects: by monitoring the change of battery voltage in a target period during the rest period, it is determined whether the battery's rest is rest after charging or rest after discharging, and the corresponding reference data is selected according to the determined rest type. According to the stable voltage value obtained after the battery is rested, the corresponding power value is searched in the reference data, and the theoretical power value is calibrated according to the power value found, thereby improving the accuracy of the rest type judgment, and then making the target power value closer to the actual power of the battery, thereby improving the calibration accuracy of the battery power.

[0041] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0043] Figure 1 is a schematic diagram of main steps of a method for calibrating the battery power of a vehicle according to an embodiment of the present invention;

[0044] Figure 2 is a schematic diagram of voltage variation of a vehicle battery during a stationary period according to an embodiment of the present invention;

[0045] Figure 3 is a schematic diagram of a voltage and power correspondence curve according to an embodiment of the present invention;

[0046] Figure 4 is a schematic diagram of main steps of another method for calibrating the battery power of a vehicle according to an embodiment of the present invention;

[0047] Figure 5 is a schematic diagram of main modules of a vehicle battery power calibration device according to an embodiment of the present invention;

[0048] Figure 6 is an exemplary system architecture diagram to which embodiments of the present invention may be applied;

[0049] Figure 7 It is a schematic diagram of the structure of a computer system of a terminal device or a server suitable for implementing an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0051] It should be pointed out that the embodiments of the present invention and the technical features therein may be combined with each other without conflict.

[0052] Figure 1 FIG. 4 is a schematic diagram of main steps of a method for calibrating the battery power of a vehicle according to an embodiment of the present invention.

[0053] like Figure 1 As shown, the vehicle battery power calibration method of the embodiment of the present invention mainly includes steps S101-S105:

[0054] Step S101, in response to determining that the vehicle battery has entered a static state, determining the theoretical power value of the battery corresponding to the first moment of the static state, and monitoring the voltage of the battery during the static state. In this embodiment, the main body of the method for performing vehicle battery power calibration is a battery management system. Herein, static means disconnecting the load connected to the vehicle battery so that the vehicle battery is in a non-working state. When the load disconnection time of the vehicle battery is greater than a preset threshold, it can be determined that the battery has entered a static state, the battery voltage during the static state is monitored, and the remaining battery power is calibrated according to the monitored voltage value.

[0055] During vehicle operation, the battery management system can obtain the remaining power value of the battery instantly through theoretical calculation methods, such as the current integration method. However, due to the extremely unstable internal conditions of the battery in the working state, the remaining power value calculated by this method deviates from the actual remaining power value of the battery. If not calibrated, the deviation will gradually accumulate, and eventually there will be a serious deviation between the theoretical power value and the actual power value. In this way, the battery management system is prone to perform improper operations on the battery, such as overcharging or over-discharging, based on the remaining power value that is too large or too small. In addition, if the remaining power value that is too large or too small is displayed to the user, it is easy for the user to be overconfident or overly anxious about the battery power, and the displayed remaining power value does not match the battery life, resulting in a bad user experience. Therefore, it is necessary to accurately calibrate the battery power.

[0056] In order to accurately determine the remaining power of the vehicle battery, the battery needs to be left at rest for a certain period of time. This is to allow the internal conditions of the battery to reach a certain degree of stability after charging or discharging stops, so that the battery current and voltage are in a stable state. The remaining power is determined based on the stabilized voltage value, and the remaining power value obtained is closer to the actual remaining power of the battery.

[0057] In addition, after obtaining a stable open-circuit voltage of the battery, the remaining power is generally determined by looking up the corresponding relationship data between the voltage and the power. However, the corresponding relationship data between the voltage and the power is divided into two types, one is used to look up the power value of the battery at rest after charging, and the other is used to look up the power value of the battery at rest after discharging. Therefore, it is necessary to determine whether the current static type of the battery is static after charging or static after discharging. According to the static type, determine whether to use the voltage and power relationship data corresponding to the static after charging or the voltage and power relationship data corresponding to the static after discharging. Therefore, determining whether the static type of the battery is static after charging or static after discharging becomes the key to power calibration.

[0058] In order to determine the static type of the battery, it is necessary to monitor the voltage change during the static period of the battery. The voltage change during the static period of the battery depends on the type of charge and discharge that the battery has just experienced before the static period. Generally speaking, after the battery is charged for a period of time and then static, for example, the battery is charged from 0% SOC to 20% SOC with a current of 0.1C and then static, its voltage change is that it continues to decrease for a period of time and then tends to be stable. The voltage change trend is as follows: Figure 2 As shown by curve A in the figure; when the battery is left at rest after being discharged for a period of time, for example, the battery is discharged from 100% SOC to 20% SOC at a current of 0.1C and then left at rest, its voltage continues to rise for a period of time and then tends to be stable. The voltage change trend is shown in Figure 2 Therefore, for the two situations corresponding to curve A and curve B, the change of the battery voltage in the two static experiments can be determined by only the voltage value at the beginning of the static experiment and the voltage value at the end of the static experiment, and the corresponding voltage change of the battery, such as increase or decrease, can be determined.

[0059] However, the actual working process of vehicle batteries is more complicated. The battery may be charged and discharged at the same time in a period of time. For example, when an electric car brakes, the vehicle braking consumes battery energy, and at the same time, the energy recovered during vehicle braking charges the battery. The battery may also be charged for a long time and then discharged for a short time in a period of time, or it may be discharged for a long time and then charged for a short time. The batteries enter a static period after these charging and discharging operations, and the voltage changes of these batteries are more complicated than the voltage changes shown in the above curves A and B. For example, the battery is discharged from 100% SOC to 19.92% SOC with a current of 0.1C, and then the battery is charged from 19.92% SOC to 20% SOC with a current of 0.1C. The battery is then left static, and its voltage changes are as follows: Figure 2 As shown in the curve C in the middle. In the voltage change situation corresponding to the curve C, the voltage value at the beginning of the static state is V0hour=3.306V, and the voltage value at the end of the static state is V6hour=3.3265V. According to the voltage values ​​at these two moments, the voltage change situation is determined to be a downward trend, but the actual voltage change is as shown in the curve C: from V0hour=3.306V at the beginning of the static state, to V0.1hour=3.26V after 0.1 hour of static state, and then to V6hour=3.265V at the end of static state. It can be calculated that the voltage shows a downward trend in the first 0.1 hour, and the voltage shows an upward trend from 0.1 hour to the end of static state. Therefore, for such a battery that is discharged for a long time first and then charged for a short time, the voltage change trend cannot be simply determined based on the two voltage values ​​corresponding to the beginning of the static state and the end of the static state.

[0060] Compared with curves A and B, the voltage change shown in curve C first decreases, then increases, and then becomes stable. Figure 2 From the curves A and B in FIG, it can be found that the voltage change trend of the battery at rest after charging is a trend of decreasing and then stabilizing, that is, a non-increasing trend, while the voltage change trend of the battery at rest after discharging is a trend of increasing and then stabilizing, that is, a non-decreasing trend.

[0061] Then Figure 2 By comparing curves B and C in the figure, it can be found that except for the initial static voltage change trend of curve C, which is different from curve B, after the initial static voltage change trend of curve C is consistent with curve B. In addition, the battery corresponding to curve B is a discharged battery, and the battery corresponding to curve C is first discharged from 100% SOC to 19.92% SOC, and then charged from 19.92% SOC to 20% SOC, that is, first discharged for a long time and then charged for a short time. Therefore, it can be concluded that the static discharge of a battery after a long time of discharge and then a short time of charging is equivalent to the static discharge of a discharged battery.

[0062] In order to prevent the changing trend of the battery voltage in the initial stage of rest from interfering with the judgment of the rest type, the voltage change in the initial stage of rest can be ignored, that is, instead of referring to the battery voltage change in the initial stage of rest, only the voltage change after the initial stage is referred to to determine whether the battery's rest type is rest after charging or rest after discharging.

[0063] According to the above description, even complex charging and discharging conditions can be equivalent to simple charging or discharging conditions. For example, the discharge for a long time and then the charging for a short time corresponding to curve C can be equivalent to the static state after discharge. Similarly, charging for a long time and then discharging for a short time can also be equivalent to the static state after charging. The premise of doing this is to ignore the voltage change of the battery at the initial static stage. In order to accurately determine the static type of the battery's static state, it is necessary to accurately determine how long the initial static state is, that is, the voltage change from which time point to which time point needs to be ignored.

[0064] Step S102, according to the monitored changes in the voltage of the battery within the target time period, determine whether the rest type of the battery belongs to rest after charging or rest after discharging; the difference between the second moment corresponding to the starting point of the target time period and the first moment is not less than the first threshold. Among them, the target time period is the other rest periods after excluding the initial rest period. Among them, the initial rest period is specifically from the start time of rest to which moment is obtained by statistics using a large amount of experimental data. The first threshold is the duration value of the initial rest period and is obtained based on experimental data. The first threshold can be 0.5 hours. That is to say, when observing the changes in the battery voltage during rest, the voltage changes in the initial rest period, such as the first 0.5 hours, should be ignored.

[0065] In an optional embodiment of the present invention, the first threshold value is obtained based on experimental data statistics; the experimental data is obtained by performing a static experiment on multiple batteries for a preset number of times, and performing different types of charging and discharging operations on the multiple batteries within a first preset time period before the start of the static experiment; the types of charging and discharging operations include: charging, discharging, charging first and then discharging, and discharging first and then charging.

[0066] Among them, before the start of the experiment, the battery is charged for a period of time, and the corresponding static type of the battery is static after charging; the battery is discharged for a period of time, and the corresponding static type of the battery is static after discharging; during this period of time, the battery is charged first and then discharged, and the charging time is much longer than the discharging time, and the corresponding static type of the battery can be equivalent to static after charging; during this period of time, the battery is discharged first and then charged, and the discharge time is much longer than the charging time, and the corresponding static type of the battery can be equivalent to static after discharge.

[0067] A sufficient number of static experiments are performed on multiple batteries that have undergone the above-mentioned charge and discharge operations, wherein the static duration can be 6 hours. It is understandable that the preset duration can be flexibly set according to actual needs and actual static conditions, and there is no limitation on this. During the static period of the battery, a voltage measurement and acquisition device is used to measure and collect the battery voltage. Thus, a large amount of experimental data is obtained. By statistically analyzing the experimental data, it can be found that the length of the initial static period is different for different battery types and / or different static types, some are 0.1 hours, some are 0.2 hours, etc., but none of them exceed 0.5 hours. According to the above analysis results, the first threshold is determined, and the first threshold can be 0.5 hours or a larger value. However, the first threshold cannot be too large. If the first threshold is too large, the remaining static period, that is, the voltage value in the target period, has stabilized after ignoring the initial static period corresponding to the first threshold, resulting in the inability to determine whether the voltage change trend is rising or falling according to the voltage value in the target period.

[0068] In an optional embodiment of the present invention, the method of determining whether the static type of the battery belongs to static after charging or static after discharging according to the monitored change of the voltage of the battery within the target period includes: determining the target period according to the first moment and the first threshold; determining the change trend of the voltage of the battery within the target period; and determining the static type of the battery according to the change trend. When determining how long the initial static period is, the first moment of the static start, such as 9:00 and the first threshold of 0.5 hours, can be used as the basis, then the initial static period is from 9:00 to 9:30. In addition, for example, if the static period is 6 hours, the static end time is 15:00. Therefore, it can be determined that the target period can be from 9:30 to 15:00. It can be understood that the start time of the target period can be any time within the time interval of 9:30-15:00 before the voltage stabilizes. After determining the target period, the voltage change trend within the target period monitored, such as a non-decreasing trend (i.e., rising and then stabilizing), or a non-increasing trend (i.e., falling and then stabilizing). According to the non-increasing or non-declining trend, the corresponding static type is determined.

[0069] In an optional embodiment of the present invention, the determining the target time period according to the first moment and the first threshold comprises: determining the sum of the first moment and the first threshold as the target moment; and determining the static time period after the target moment as the target time period. As described in the above embodiment, the first moment is 9:00, the first threshold is 0.5 hours, and the target moment is 9:30, then the target time period is the part after 9:30.

[0070] In an optional embodiment of the present invention, the determination of the static type of the battery according to the change trend includes: when the change trend is a non-declining trend, determining the static type of the battery to be static after discharge; when the change trend is a non-increasing trend, determining the static type of the battery to be static after charge. According to a non-declining trend, that is, stabilizing after rising, determining the static type corresponding to the battery to be static after discharge; according to a non-increasing trend, determining the static type corresponding to the battery to be static after charge.

[0071] Step S103, determining the target voltage value corresponding to the battery at the end of the rest period, wherein the end of the rest period may refer to the voltage value of the battery at the last moment of the rest period, or may refer to the voltage value when the voltage tends to be stable within a period of time after the rest period, such as the last 10 minutes, 15 minutes, 20 minutes, etc. of the six hours of rest period.

[0072] In an optional embodiment of the present invention, the target voltage value corresponding to the battery at the end of the static state includes: monitoring the change value of the battery voltage within a second preset time; determining whether the change value is less than a second threshold; when the change value is less than the second threshold, stopping monitoring the voltage of the battery, and determining the current voltage of the battery as the target voltage value. When different batteries are static, some may need a longer time to reach a stable voltage value, while others may need a slightly shorter time to reach a stable voltage value. However, for the sake of convenience, in the prior art, one standard is adopted for all batteries, that is, different batteries are static for the same time before the power calibration is performed, which causes a waste of time. In order to adopt a specific static state for different batteries, during the voltage monitoring period, the voltage change value between two moments is calculated regularly, and when the voltage change value is small or negligible, it can be determined that the voltage has reached a stable value. At this time, regardless of whether the static state is reached, the static operation of the battery can be stopped, that is, the battery can be used normally, and the battery voltage during the static state is stopped from being monitored, thereby saving the static state time and improving the efficiency of power calibration.

[0073] Step S104, searching for a target power value corresponding to a target voltage value in preset reference data corresponding to the static type to which the battery belongs. When the static type is or is equivalent to static after charging, the voltage and power correspondence data corresponding to static after charging are selected, and the target voltage value is first found from the voltage and power correspondence data, and then the target power value corresponding to the target voltage value is determined in the data, so as to obtain a more accurate remaining power value of the battery.

[0074] In an optional embodiment of the present invention, the preset reference data is the corresponding relationship data between the voltage and the state of charge of the battery. In the embodiment of the present invention, the "voltage" refers to the open circuit voltage of the battery, that is, OCV (Open Circuit Voltage), and the state of charge, that is, SOC (State Of Charge), that is, the power of the battery.

[0075] In an optional embodiment of the present invention, the preset reference data is in the form of a table and / or a curve graph. Figure 3 The curve D is the reference data corresponding to the static state after charging, and the curve E is the reference data corresponding to the static state after discharging.

[0076] Step S105, calibrate the theoretical power value according to the target power value. Before power calibration, the power value displayed by the battery management system is the theoretical power value. Since the theoretical power value is quite different from the actual power value of the battery, after obtaining the target power value, the theoretical power value is modified to the target power value, so that the battery management system can display the correct power value to the user, so that the user can make the correct vehicle use decision according to the calibrated power value; in addition, the battery management system can correctly manage the battery according to the calibrated power value, thereby protecting the battery and extending the battery life.

[0077] The following describes in detail a method for calibrating the battery power of a vehicle through a specific embodiment.

[0078] like Figure 4 As shown, the vehicle battery power calibration method of this embodiment mainly includes the following main steps: S401-S410:

[0079] Step S401, in response to determining that the vehicle battery enters a stationary state, determining a theoretical power value of the battery corresponding to the first moment of the start of the stationary state, and monitoring the voltage of the battery during the stationary state.

[0080] Step S402, determining a target time period according to a first time at which the stationary state starts and a first threshold value; a difference between a second time corresponding to a starting point of the target time period and the first time period is not less than the first threshold value.

[0081] Step S403, determining a change trend of the battery voltage within the target time period according to the change of the battery voltage within the target time period.

[0082] Step S404, determining a target voltage value corresponding to the battery at the end of the static state.

[0083] Step S405, determining whether the change trend is a non-downward trend, if yes (the change trend is a non-downward trend), executing step S406; if no (the change trend is a non-upward trend), executing step S407.

[0084] Step S406, determining that the static type of the battery is static after discharge.

[0085] Step S407, determining that the static type of the battery is static after charging.

[0086] Step S408, determining preset reference data corresponding to the static type of the battery.

[0087] Step S409, searching the target power value corresponding to the target voltage value based on the preset reference data.

[0088] Step S410, calibrating the theoretical power value according to the target power value.

[0089] The vehicle battery power calibration method of the embodiment of the present invention determines whether the battery's current rest is rest after charging or rest after discharging by monitoring the change in battery voltage during a target period of rest, selects corresponding reference data according to the determined rest type, searches for the corresponding power value in the reference data according to the stable voltage value obtained after the battery has been rested, and calibrates the theoretical power value based on the power value obtained, thereby improving the accuracy of the rest type judgment, thereby making the target power value closer to the actual power of the battery, and improving the calibration accuracy of the battery power.

[0090] Figure 5 4 is a schematic diagram of main modules of a device for calibrating the battery power of a vehicle according to an embodiment of the present invention.

[0091] like Figure 5 As shown, the vehicle battery power calibration device 500 of the embodiment of the present invention includes:

[0092] The static module 501 is used to determine the theoretical power value of the battery at the first moment of the static state in response to determining that the vehicle battery enters the static state, and monitor the voltage of the battery during the static state;

[0093] The monitoring module 502 is used to determine whether the static type of the battery is static after charging or static after discharging according to the monitored change of the voltage of the battery within the target period; the difference between the second moment corresponding to the starting point of the target period and the first moment is not less than a first threshold; and determine the target voltage value corresponding to the battery at the end of the static state;

[0094] A search module 503 is used to search for a target power value corresponding to a target voltage value in preset reference data corresponding to a static type to which the battery belongs;

[0095] The calibration module 504 is used to calibrate the theoretical power value according to the target power value.

[0096] In an optional embodiment of the present invention, the first threshold value is obtained based on experimental data statistics; the experimental data is obtained by performing a static experiment on multiple batteries for a preset number of times, and performing different types of charging and discharging operations on the multiple batteries within a first preset time period before the start of the static experiment; the types of charging and discharging operations include: charging, discharging, charging first and then discharging, and discharging first and then charging.

[0097] In an optional embodiment of the present invention, the monitoring module 502 is further used to determine the target time period based on the first moment and the first threshold; determine the change trend of the battery voltage within the target time period; and determine the static type of the battery based on the change trend.

[0098] In an optional embodiment of the present invention, the monitoring module 502 is further configured to determine the sum of the first moment and the first threshold as the target moment; and determine the static period after the target moment as the target period.

[0099] In an optional embodiment of the present invention, the monitoring module 502 is further used to determine that the static type of the battery is static after discharge when the change trend is a non-downward trend; and to determine that the static type of the battery is static after charging when the change trend is a non-increasing trend.

[0100] In an optional embodiment of the present invention, the monitoring module 502 is also used to monitor the change value of the battery voltage within a second preset time period; determine whether the change value is less than a second threshold; when the change value is less than the second threshold, stop monitoring the battery voltage and determine the current voltage of the battery as the target voltage value.

[0101] In an optional embodiment of the present invention, the preset reference data is the correspondence data between the voltage and the state of charge of the battery; and / or, the preset reference data is in the form of a table and / or a curve graph.

[0102] The vehicle battery power calibration device of the embodiment of the present invention determines whether the battery's current rest is rest after charging or rest after discharging by monitoring the change in battery voltage during a target period of rest, selects corresponding reference data according to the determined rest type, searches for the corresponding power value in the reference data according to the stable voltage value obtained after the battery has been rested, and calibrates the theoretical power value based on the power value obtained, thereby improving the accuracy of the rest type judgment, thereby making the target power value closer to the actual power of the battery, and improving the calibration accuracy of the battery power.

[0103] Figure 6 An exemplary system architecture 600 is shown to which a vehicle battery power calibration method or a vehicle battery power calibration device according to an embodiment of the present invention may be applied.

[0104] like Figure 6 As shown, the system architecture 600 may include a voltage monitoring device 601, a network 602, and a battery management system 603. The network 602 is used to provide a medium for a communication link between the voltage monitoring device 601 and the battery management system 603. The network 602 may include various connection types, such as wired, wireless communication links, or optical fiber cables, etc.

[0105] The user can use the battery management system 603 to interact with the voltage monitoring device 601 through the network 602 to receive or send data, etc. The voltage monitoring device 601 can be a device that measures and collects battery voltage data during the battery's static state, or a device that supports data collection during vehicle driving, including but not limited to smart phones, tablet computers, laptops, and desktop computers, etc. The battery management system 603 is a battery management system on an electric vehicle, or it can be a battery management system on a remote service end.

[0106] It should be noted that the vehicle battery power calibration method provided in the embodiment of the present invention can be executed by the battery management system 603 , and accordingly, the vehicle battery power calibration device can be arranged in the battery management system 603 .

[0107] It should be understood that Figure 6 The number of voltage monitoring devices, networks, and battery management systems in the embodiment is only for illustration purposes. Any number of acquisition devices, networks, and battery management systems may be provided as required.

[0108] Reference below Figure 7 , which shows a schematic diagram of the structure of a computer system 700 of an electronic device suitable for implementing an embodiment of the present invention. Figure 7 The battery management system shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0109] like Figure 7 As shown, the computer system 700 includes a central processing unit (CPU) 701, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 702 or a program loaded from a storage part 708 into a random access memory (RAM) 703. In the RAM 703, various programs and data required for the operation of the computer system 700 are also stored. The CPU 701, the ROM 702, and the RAM 703 are connected to each other via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0110] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, a mouse, etc.; an output section 707 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN card, a modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 710 as needed, so that a computer program read therefrom is installed into the storage section 708 as needed.

[0111] In particular, according to the embodiments disclosed in the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 709, and / or installed from the removable medium 711. When the computer program is executed by the central processing unit (CPU) 701, the above-mentioned functions defined in the system of the present invention are executed.

[0112] It should be noted that the computer-readable medium shown in the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0113] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0114] The modules involved in the embodiments of the present invention may be implemented by software or hardware. The modules described may also be set in a processor. For example, they may be described as: a processor includes a static module, a monitoring module, a search module, and a calibration module. The names of these modules do not, in some cases, constitute limitations on the modules themselves. For example, the calibration module may also be described as a "module for calibrating the theoretical power value."

[0115] As another aspect, the present invention also provides a computer-readable medium, which may be included in the device described in the above embodiment; or it may exist independently and not be assembled into the device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by a device, the device includes: in response to determining that the vehicle battery enters a static state, determining the theoretical power value corresponding to the first moment of the start of static state of the battery, and monitoring the voltage of the battery during the static state; according to the monitored change of the voltage of the battery within the target time period, determining whether the static type of the battery belongs to static state after charging or static state after discharging; the difference between the second moment corresponding to the starting point of the target time period and the first moment is not less than the first threshold; determining the target voltage value corresponding to the battery at the end of static state; searching for the target power value corresponding to the target voltage value in the preset reference data corresponding to the static type to which the battery belongs; and calibrating the theoretical power value according to the target power value.

[0116] According to the technical solution of the embodiment of the present invention, by monitoring the change of the battery voltage in the target time period during the rest period, it is determined whether the battery's current rest is rest after charging or rest after discharging, and the corresponding reference data is selected according to the determined rest type. According to the stable voltage value obtained after the battery is rested, the corresponding power value is searched in the reference data, and the theoretical power value is calibrated according to the power value found, thereby improving the accuracy of the rest type judgment, and then making the target power value closer to the actual power of the battery, thereby improving the calibration accuracy of the battery power.

[0117] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for calibrating the battery power of a vehicle, characterized in that: include: In response to determining that the vehicle battery enters a stationary state, determining a theoretical power value of the battery corresponding to a first moment when the stationary state begins, and monitoring a voltage of the battery during the stationary state; Determining whether the rest type of the battery is rest after charging or rest after discharging according to the monitored change of the voltage of the battery within the target time period; The difference between the second moment corresponding to the starting point of the target time period and the first moment is not less than a first threshold; Determining a target voltage value corresponding to the battery at the end of standing; Searching for a target power value corresponding to a target voltage value in preset reference data corresponding to the static type to which the battery belongs; The theoretical power value is calibrated according to the target power value.

2. The method according to claim 1, characterized in that: The first threshold is obtained based on experimental data statistics; The experimental data is obtained by performing a static experiment on multiple batteries for a preset number of times, and different types of charge and discharge operations are performed on the multiple batteries within a first preset time period before the static experiment begins; The types of charge and discharge operations include: charging, discharging, charging first and then discharging, and discharging first and then charging.

3. The method according to claim 1 or 2, characterized in that: The step of determining whether the battery is placed in a static state after charging or placed in a static state after discharging according to the monitored change of the battery voltage within the target time period includes: Determining the target time period according to the first moment and the first threshold; Determining a variation trend of the voltage of the battery within the target time period; The static type of the battery is determined according to the change trend.

4. The method according to claim 3, characterized in that The determining the target time period according to the first moment and the first threshold includes: Determine a sum of the first moment and the first threshold as a target moment; A rest period after the target time is determined as the target period.

5. The method according to claim 3, characterized in that: Determining the static type of the battery according to the change trend includes: When the change trend is a non-downward trend, determining that the static type of the battery is static after discharge; When the change trend is a non-increasing trend, it is determined that the static type of the battery is static after charging.

6. The method according to claim 1, characterized in that The determining of the target voltage value corresponding to the battery at the end of the static state includes: Monitoring the change in the battery voltage within a second preset time period; determining whether the change value is less than a second threshold; When the change value is smaller than the second threshold, monitoring the voltage of the battery is stopped, and the current voltage of the battery is determined as the target voltage value.

7. The method according to claim 1, characterized in that The preset reference data is the corresponding relationship data between the voltage and the state of charge of the battery; and / or, The preset reference data is in the form of a table and / or a graph.

8. A battery power calibration device, characterized in that: include: A static module, configured to, in response to determining that the vehicle battery enters a static state, determine a theoretical power value of the battery corresponding to a first moment of the start of the static state, and monitor a voltage of the battery during the static state; A monitoring module, used for determining whether the rest type of the battery is rest after charging or rest after discharging according to the monitored change of the voltage of the battery within a target period of time; The difference between the second moment corresponding to the starting point of the target time period and the first moment is not less than a first threshold; and determining a target voltage value corresponding to the battery at the end of the static state; A search module, used to search for a target power value corresponding to a target voltage value in preset reference data corresponding to a static type to which the battery belongs; The calibration module is used to calibrate the theoretical power value according to the target power value.

9. An electronic device for calibrating the battery charge of a vehicle, characterized in that: include: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 7.

10. A computer readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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