Method, device and vehicle for correcting a state of charge display value of a vehicle battery

Abstract

The embodiment of the specification provides a method, device and vehicle for correcting a state of charge display value of a vehicle battery. In the method, when it is determined according to a working parameter of the vehicle battery that the vehicle battery is in a small-load stable operation condition, a battery state characteristic value of the vehicle battery is determined, the battery state characteristic value is used to indicate a ratio of a battery voltage change amount to a battery capacity change amount in a unit time, and the state of charge display value of the vehicle battery is corrected based on the battery state characteristic value. By using the method, since the small-load stable operation condition is prone to occur in the process of vehicle driving or parking power consumption, and the battery state characteristic value can eliminate the adverse effects caused by the battery working current, more opportunities can be provided for accurately correcting the state of charge display value in the process of vehicle driving or parking power consumption, so that the state of charge display value is ensured to be not inaccurate for a long time, and thus the driving decision reliability of the driver and the vehicle experience are improved.

Description

Technical Field

[0001] The embodiments in this specification generally relate to the field of vehicles, and more particularly to methods, apparatus, and vehicles for correcting the displayed state of charge (SOC) value of a vehicle battery. Background Technology

[0002] During vehicle operation, the vehicle's operating status needs to be monitored in real time, including the battery's State of Charge (SOC). SOC indicates the remaining battery charge and can be displayed on the vehicle's instrument panel for the driver's reference. The displayed SOC value is typically determined using the ampere-hour integral method, which can result in a difference between the displayed value and the actual SOC value. Therefore, the displayed SOC value needs to be calibrated. Summary of the Invention

[0003] This specification provides a method, apparatus, and vehicle for correcting the State of Charge (SOC) display value of a vehicle battery. The correction method determines whether the vehicle battery is in a low-load stable operating condition based on its operating parameters. In response to the vehicle battery being in a low-load stable operating condition, a battery state characteristic value is determined. This battery state characteristic value indicates the ratio of the change in battery voltage to the change in battery capacity per unit time. The SOC display value of the vehicle battery is corrected based on this battery state characteristic value. Since low-load stable operating conditions are likely to occur during vehicle operation or parking, and the battery state characteristic value can eliminate the adverse effects caused by the battery operating current, more opportunities are provided to accurately correct the SOC display value during vehicle operation or parking. This ensures that the SOC display value is not inaccurate for extended periods, thereby improving the reliability of the driver's driving decisions and the user experience.

[0004] According to one aspect of the embodiments of this specification, a method for correcting the SOC display value of a vehicle battery is provided, comprising: determining whether the vehicle battery is in a low-load stable operating condition based on operating parameters of the vehicle battery, the operating parameters including bus discharge current and current output parameters; in response to the vehicle battery being in a low-load stable operating condition, determining a battery state characteristic value of the vehicle battery, the battery state characteristic value indicating the ratio of the change in battery voltage to the change in battery capacity per unit time; and correcting the SOC display value of the vehicle battery based on the battery state characteristic value.

[0005] Optionally, in one example of the above aspects, correcting the displayed SOC value of the vehicle battery based on the battery state characteristic value includes: obtaining the true SOC value corresponding to the battery state characteristic value from the relationship curve between the battery state characteristic value and the true SOC value corresponding to the vehicle's operating condition; and correcting the displayed SOC value of the vehicle battery based on the true SOC value when the true SOC value contains a unique value.

[0006] Optionally, in one example of the above aspects, correcting the displayed SOC value of the vehicle battery based on the true SOC value includes: correcting the displayed SOC value to the true SOC value.

[0007] Optionally, in one example of the above aspects, correcting the displayed SOC value of the vehicle battery based on the true SOC value includes: correcting the displayed SOC value of the vehicle battery based on a charge change correction coefficient.

[0008] Optionally, in one example of the above aspects, the step of correcting the displayed SOC value of the vehicle battery based on the actual SOC value further includes: determining the power change correction coefficient based on user correction requirements; determining the power change correction coefficient based on the displayed SOC value, the actual SOC value, and the target SOC value; or determining the power change correction coefficient based on the displayed SOC value, the actual SOC value, and user correction requirements.

[0009] Optionally, in one example of the above aspects, the charge change correction factor includes a rate current integral factor, and correcting the SOC display value of the vehicle battery based on the charge change correction factor includes: using a current integral correction method based on the rate current integral factor to correct the SOC display value of the vehicle battery.

[0010] Optionally, in one example of the above aspects, correcting the displayed SOC value of the vehicle battery based on the battery state characteristic value further includes: determining the aging factor of the vehicle battery, and obtaining the true SOC value corresponding to the battery state characteristic value from the battery state characteristic value-true SOC value relationship curve corresponding to the vehicle's operating conditions, including: obtaining the true SOC value corresponding to the battery state characteristic value from the battery state characteristic value-true SOC value relationship curve corresponding to the vehicle's operating conditions and the aging factor.

[0011] Optionally, in one example of the above aspects, determining whether the vehicle battery is in a low-load stable operating condition based on the vehicle battery's operating parameters includes: determining whether the vehicle battery is in a low-load operating condition based on the vehicle battery's bus discharge current; determining the vehicle battery's current output parameters when the vehicle battery is in a low-load operating condition; and determining that the vehicle battery is in a low-load stable operating condition when the current output parameters indicate that the vehicle battery is in a steady-state current output.

[0012] According to another aspect of the embodiments of this specification, an apparatus for correcting the SOC display value of a vehicle battery is provided, comprising: an operating condition determination unit configured to determine whether the vehicle battery is in a low-load stable operating condition based on operating parameters of the vehicle battery, the operating parameters including bus discharge current and current output parameters; a battery state characteristic value determination unit configured to determine a battery state characteristic value of the vehicle battery in response to the vehicle battery being in a low-load stable operating condition, the battery state characteristic value indicating the ratio of the change in battery voltage to the change in battery capacity per unit time; and an SOC correction unit configured to correct the SOC display value of the vehicle battery based on the battery state characteristic value.

[0013] Optionally, in one example of the above aspects, the SOC correction unit includes: a SOC true value acquisition module, configured to acquire the SOC true value corresponding to the battery state characteristic value from the battery state characteristic value-SOC true value relationship curve corresponding to the vehicle's operating condition; and a SOC display value correction module, configured to correct the SOC display value of the vehicle battery based on the SOC true value when the SOC true value contains a unique value.

[0014] According to another aspect of the embodiments of this specification, a vehicle is provided, including: a vehicle battery; an operating parameter monitoring device configured to monitor the operating parameters of the vehicle battery; a display value determining device configured to determine a SOC display value of the vehicle battery; an on-board instrument configured to display the determined SOC display value; and a device for correcting the SOC display value of the vehicle battery as described above.

[0015] According to another aspect of the embodiments of this specification, an apparatus for correcting the displayed SOC value of a vehicle battery is provided, comprising: at least one processor; a memory coupled to the at least one processor; and a computer program stored in the memory, wherein the at least one processor executes the computer program to implement the method for correcting the displayed SOC value of a vehicle battery as described above.

[0016] According to another aspect of the embodiments of this specification, a computer-readable storage medium is provided that stores executable instructions, which, when executed, cause a processor to perform the method described above for correcting the SOC display value of a vehicle battery.

[0017] According to another aspect of the embodiments of this specification, a computer program product is provided, including a computer program that is executed by a processor to implement the method described above for correcting the SOC display value of a vehicle battery. Attached Figure Description

[0018] A further understanding of the nature and advantages of this specification can be achieved by referring to the following figures. In the figures, similar components or features may have the same reference numerals.

[0019] Figure 1 A schematic diagram of an example architecture of a vehicle according to an embodiment of this specification is shown.

[0020] Figure 2 An example flowchart of a method for correcting the displayed SOC value of a vehicle battery according to an embodiment of this specification is shown.

[0021] Figure 3 An example flowchart of a method for determining whether a vehicle battery is in a low-load stable operating condition, according to an embodiment of this specification, is shown.

[0022] Figure 4 An example flowchart of a method for correcting the displayed SOC value of a vehicle battery based on battery state characteristic values, according to an embodiment of this specification, is shown.

[0023] Figures 5A-5F This shows the state-of-the-art characteristics of various batteries with different internal components. -Schematic diagram of the relationship curve between the actual SOC value and the actual value.

[0024] Figure 6 An example block diagram of a SOC display value correction device according to an embodiment of this specification is shown.

[0025] Figure 7 An example block diagram of an operating condition determination unit according to an embodiment of this specification is shown.

[0026] Figure 8 An example block diagram of a SOC correction unit according to an embodiment of this specification is shown.

[0027] Figure 9 An example schematic diagram of a SOC display value correction device implemented based on a computer system according to an embodiment of this specification is shown. Detailed Implementation

[0028] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. The function and arrangement of the elements discussed may be changed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the various examples. For example, the described methods may be performed in a different order than described, and steps may be added, omitted, or combined. Furthermore, features described in some examples may be combined in other examples.

[0029] As used herein, the term "comprising" and its variations are open terms meaning "including but not limited to". The term "based on" means "at least partially based on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other definitions, whether explicit or implicit, may be included below. Unless explicitly indicated by the context, the definition of a term shall remain consistent throughout the specification.

[0030] The flowcharts used in this specification illustrate operations implemented according to some embodiments of this specification. It should be clearly understood that the operations in the flowcharts may not be implemented in a sequential order. Instead, the operations may be implemented in reverse order or simultaneously. Furthermore, one or more additional operations may be added to the flowcharts. One or more operations may be removed from the flowcharts.

[0031] The ampere-hour integration method is commonly used to determine the State of Charge (SOC) display value. This method estimates the battery's charge and discharge capacity by integrating the operating current of the vehicle battery over time, thereby deriving the remaining battery capacity. This method requires current sampling. Since sensors cannot achieve 100% accuracy, current sampling errors exist, and these errors accumulate over long integration periods. This leads to an increasingly large deviation between the determined SOC display value and the actual SOC value, thus requiring calibration of the SOC display value.

[0032] The Open Circuit Voltage (OCV) method is a technique used to correct the displayed State of Charge (SOC) value. This method requires allowing the battery to rest for at least two hours to eliminate internal polarization. The open circuit voltage of the rested battery is then measured, and the true SOC value is determined from the relationship curve between the open circuit voltage (vehicle battery terminal voltage) and the true SOC value. This determined true SOC value is then used to correct the displayed SOC value. Since the open circuit voltage measured after eliminating internal polarization is determined by the electrode potential within the battery, and this electrode potential is directly related to the remaining amount of active material, the open circuit voltage measured under these conditions is directly related to the true SOC value. Therefore, the true SOC value can be accurately determined based on the relationship curve between the open circuit voltage and the true SOC value, resulting in a better correction effect.

[0033] As mentioned above, the OCV method has stringent usage conditions, requiring the vehicle battery to be disconnected from all external loads and left to rest for at least two hours after charging and discharging has stopped. These conditions mean that there are very few opportunities to use the OCV method to correct the SOC display value during vehicle battery operation, resulting in prolonged inaccuracy of the SOC display value. Furthermore, it is unsuitable for applications where the vehicle battery is powered by the vehicle's load. Prolonged inaccuracy of the SOC display value can negatively impact the driver's driving decisions and overall driving experience.

[0034] In view of this, embodiments of this specification propose a scheme for correcting the SOC display value of a vehicle battery. This SOC display value correction scheme determines whether the vehicle battery is in a low-load stable operating condition based on the vehicle battery's operating parameters. In response to the vehicle battery being in a low-load stable operating condition, it determines the battery state characteristic value, which indicates the ratio of the change in battery voltage to the change in battery capacity per unit time. Based on this battery state characteristic value, the SOC display value of the vehicle battery is corrected. Since low-load stable operating conditions are likely to occur during vehicle driving or parking, and the battery state characteristic value can eliminate the adverse effects caused by the battery operating current, this provides more opportunities to accurately correct the SOC display value during vehicle driving or parking, thereby ensuring that the SOC display value is not inaccurate for extended periods, thus improving the reliability of the driver's driving decisions and the user experience.

[0035] The following description, with reference to the accompanying drawings, describes a vehicle, a method for correcting the SOC display value of a vehicle battery, and an apparatus for correcting the SOC display value of a vehicle battery (hereinafter referred to as "SOC display value correction apparatus").

[0036] The embodiments in this manual are applicable to various new energy vehicles, including but not limited to pure electric vehicles and plug-in hybrid vehicles.

[0037] Figure 1 A schematic diagram of an example architecture of a vehicle 100 according to an embodiment of this specification is shown.

[0038] like Figure 1 As shown, vehicle 100 is equipped with vehicle battery 110. Vehicle battery 110 provides a power source for vehicle 100. Vehicle 100 also includes an operating parameter monitoring device 120. The operating parameter monitoring device 120 is connected to vehicle battery 110 and is used to monitor the battery operating parameters of vehicle battery in real time, such as vehicle battery operating current, vehicle battery terminal voltage, etc.

[0039] Vehicle 100 also includes a display value determination device 130. The display value determination device 130 is communicatively connected to the operating parameter monitoring device 120 and is equipped with an algorithm for determining display values. This algorithm acquires the operating parameters of the vehicle battery monitored by the operating parameter monitoring device 120 and determines the display values ​​to be presented to the driver based on the battery operating parameters and the installed algorithm. The determined display values ​​include at least the SOC (State of Health) display value. In some examples, the determined display values ​​may also include a State of Health (SOH) display value and a State of Energy (SOE) display value.

[0040] The vehicle 100 is also equipped with an on-board instrument cluster 140. The on-board instrument cluster 140 is communicatively connected to the display value determination device 130 to present the display value determined by the display value determination device 130 in real time (e.g., the SOC display value) to assist the driver in making various driving decisions or for the driver to view.

[0041] The vehicle 100 also includes a SOC display value correction device 150. The SOC display value correction device 150 is communicatively connected to the operating parameter monitoring device 120, the display value determination device 130, and the vehicle instrument 140, respectively, and is used to correct the display value (e.g., the SOC display value) determined by the display value determination device 130 based on the battery operating parameters monitored by the operating parameter monitoring device 120, and display the corrected SOC display value on the vehicle instrument 140.

[0042] Figure 2 An example flowchart of a method 200 for correcting the State of Charge (SOC) display value of a vehicle battery according to an embodiment of this specification is shown. This method 200 can be performed at an SOC display value correction device 150.

[0043] like Figure 2As shown, at point 210, the vehicle battery's operating parameters are used to determine whether it is operating under a low-load, stable condition. These operating parameters include the bus discharge current and current output parameters.

[0044] The low-load stable operation condition requires simultaneous fulfillment of both low-load operation condition and stable operation condition. The low-load operation condition of a vehicle battery refers to an operating state where the vehicle battery output power or bus current is relatively low. The stable operation condition of a vehicle battery refers to an operating state where the vehicle battery output power or bus current fluctuates relatively little.

[0045] Figure 3 An example flowchart of a method 300 for determining whether a vehicle battery is in a low-load stable operating condition, according to an embodiment of this specification, is shown.

[0046] like Figure 3 As shown, at point 310, the vehicle battery is determined to be operating under low load conditions based on the bus discharge current of the vehicle battery.

[0047] The operating parameter monitoring device 120 may include a current sensor, which measures the bus discharge current of the vehicle battery. The bus discharge current refers to the current flowing from the bus to the load or other circuit components in the battery system. Since the bus is the central point connecting the vehicle battery to various loads, the bus discharge current value is equal to the total discharge current value of the system. By directly monitoring the bus discharge current, it is unnecessary to monitor the discharge current of each branch separately, avoiding the complexity of monitoring current in multiple branches.

[0048] The load of a vehicle battery is essentially the intensity of the vehicle's energy demand on the battery. When the battery voltage is relatively stable, the energy demand can be quantified by the current. Therefore, the total output load of the vehicle battery can be quantified by the magnitude of the bus discharge current.

[0049] In some embodiments, the magnitude of the bus discharge current can be used to determine whether the vehicle is operating under a low-load condition. For example, when the vehicle's bus discharge current is less than a preset current threshold (e.g., 5A), it can be determined that the vehicle battery is operating under a low-load condition. Low-load operating conditions may include, but are not limited to, the following: low-speed constant-speed driving or parking power consumption. Parking power consumption may include, but is not limited to, situations where the vehicle only uses some low-power onboard electrical equipment, such as interior lighting, Bluetooth connectivity, parking entertainment, starting the anti-theft system, activating the remote key receiver, etc. Under these conditions, the load on the vehicle battery is small, and the bus discharge current output by the vehicle battery is correspondingly small.

[0050] If the bus discharge current is higher than the preset current threshold, it can be determined that the vehicle battery is not in a low-load operating condition, and 310 can be executed. Otherwise, it can be determined that the vehicle battery is in a low-load operating condition, and 320 can be executed.

[0051] At 320, determine the current output parameters of the vehicle battery.

[0052] In some embodiments, the current output parameter may be the bus discharge current of the vehicle battery, which may vary over time.

[0053] In some embodiments, the current output parameter can be the current stability coefficient of the vehicle battery. The current stability coefficient varies with time. In some examples, the current stability coefficient at time t can be expressed as the current stability coefficient before time t. The average current over the time period and before time t The ratio of the average current over the time period is shown in the following formula (1):

[0054] (1)

[0055] in, Generally Several times, This represents the bus discharge current output by the vehicle battery at time t. In some examples, It can be equal to 0.1 seconds, and It can be equal to 1 second.

[0056] It can be seen from the above formula (1) that if If time t is very close to or equal to 1, it means that the vehicle battery load was higher than at time t. The average current over a time period relative to the current before time t The average current over the time period did not fluctuate significantly or remain completely consistent.

[0057] At 330, determine whether the current output parameter indicates that the vehicle battery is in a steady-state current output state.

[0058] When the current output parameter is characterized using the bus discharge current, it can be given a time Internal bus discharge current Sampling is performed, and it is determined whether the sampled bus discharge current value fluctuates within a predetermined fluctuation range. For example, determining the sampled bus discharge current... Are they all within the current threshold range, for example? If in The bus discharge current sampled inside If all current parameters are within the above current threshold range, it can be determined that the vehicle battery is in a steady-state current output state, and the process proceeds to step 340. Otherwise, it returns to step 320 to continue determining the current output parameters of the vehicle battery, or the process ends.

[0059] When the current output parameter is characterized by the current stability coefficient, it can be determined that a given time... Internal current stability coefficient Is it within the current stability coefficient threshold range, for example? ≤| |≤ , and It is closer to 1. For example, , , If in a given Internal current stability coefficient If all parameters are within the aforementioned current stability coefficient threshold range, the vehicle battery is in a steady-state current output state, and the process proceeds to step 340. Otherwise, the process returns to step 320 to continue determining the vehicle battery's current output parameters, or the process ends.

[0060] If the vehicle battery is determined to be operating under low load at point 310 and to be operating under steady-state current at point 330, then the vehicle battery can be determined to be operating under low load and stable conditions at point 340.

[0061] Battery polarization occurs when a vehicle battery is in operation (i.e., not in an open-circuit state). Battery polarization refers to the deviation of the battery's operating voltage from its resting open-circuit voltage due to a mismatch between the internal electrochemical reaction rate, ion transport rate, and external current demand during charging and discharging. Under low-load stable operating conditions, the mismatch between the battery's internal reaction / transport rate and external current demand can be reduced by decreasing the operating current and maintaining its stability, thus significantly weakening the polarization effect. Therefore, the polarization effect on vehicle batteries under low-load stable operating conditions is relatively small. The battery state characteristic values ​​based on the battery's operating parameters under these conditions can accurately reflect the true SOC value of the vehicle battery, making the SOC value determined based on the battery state characteristic values ​​more accurate. Furthermore, various low-load stable operating conditions exist during vehicle driving or parking, significantly increasing the opportunities to correct the displayed SOC value.

[0062] Return to Figure 2 At position 220, the battery state characteristic value of the vehicle battery is determined. The battery state characteristic value indicates the ratio of the change in battery voltage to the change in battery capacity per unit time (i.e., ...). ).

[0063] The change in battery voltage per unit time can be obtained by the difference between the voltage at the beginning and end of the unit time. The change in battery capacity per unit time can be obtained by multiplying the average current per unit time corresponding to the change in battery voltage by the unit time duration. For example, the unit time could be 100 milliseconds.

[0064] As mentioned earlier, when the vehicle battery is in a discharging state, the battery operating voltage (V) is equal to the resting open-circuit voltage (V). Subtract polarization voltage ), polarization voltage The polarization voltage is mainly determined by the operating current I and the battery internal resistance R. Under stable low-load operating conditions, the state of charge (SOC) changes slowly across the entire range. When calculating battery state characteristics... At that time, due to polarization voltage The change is slow, so This factor is so small that it can be ignored. Therefore... It is approximately equal to the intrinsic thermodynamic properties of the battery material. Using battery state characteristics This can eliminate the adverse effects caused by the battery operating current when detecting the true SOC value, thereby allowing the true SOC value to be accurately determined based on the battery state characteristic value.

[0065] At position 230, the displayed SOC value of the vehicle battery is corrected based on the battery state characteristic value.

[0066] Figure 4 An example flowchart of a method 400 for correcting the displayed SOC value of a vehicle battery based on battery state characteristic values, according to an embodiment of this specification, is shown.

[0067] like Figure 4 As shown, at 410, the SOC true value corresponding to the battery state characteristic value determined at 220 is obtained from the relationship curve between the battery state characteristic value and the SOC true value corresponding to the vehicle's operating condition.

[0068] The relationship curve between battery state characteristics and actual SOC value can be tested, calibrated, and stored before the vehicle battery leaves the factory using the following methods.

[0069] The battery is cyclically discharged according to the discharge current under the actual low-load stable operating conditions of the vehicle. The relationship between battery voltage, bus discharge current, and actual SOC is recorded during the discharge process. Based on the aforementioned battery state characteristic values... The calculation method yields the battery state characteristic values ​​corresponding to different true SOC values ​​during the discharge process. This allows us to obtain the battery state characteristic values ​​under stable low-load operating conditions. -SOC true value relationship curve.

[0070] Taking a vehicle battery operating under low load and stable conditions at 25℃ and a discharge current of 3A as an example, the accurate battery capacity is first obtained. Place the battery in a 25°C ambient chamber for 2 hours, then discharge it at a constant current of 0.33C. Stop discharging when the voltage reaches the discharge cutoff voltage. After 2 hours, charge it again at a constant current of 0.33C until the charging cutoff voltage is reached, then adjust to constant voltage charging until the charging current drops to 0.05C. At this point, the battery is considered fully charged, and the true SOC value is 100%. Repeat the above "discharge-charge" cycle 3 times. If the maximum capacity deviation of the 3 charges is <=2%, then the average of the 3 charges is taken as the battery capacity.

[0071] Secondly, the battery is discharged at a 3A discharge current. The actual SOC value can be obtained in real time based on the ratio of discharged capacity to battery capacity. The battery voltage, bus discharge current, and actual SOC value are recorded throughout the discharge process, and based on the aforementioned battery state characteristic values... The calculation method obtains the battery state characteristic values ​​corresponding to different true SOC values ​​during the discharge process. This allows us to obtain the battery state characteristic values ​​under stable low-load operating conditions. -SOC true value relationship curve.

[0072] The relationship curve between battery state characteristics and true SOC is related to the internal component ratio of the vehicle battery. Different internal component ratios will result in different battery state characteristics-true SOC relationship curves. Figures 5A-5F The battery state characteristics of vehicle batteries with different internal component allocation ratios are shown. -Schematic diagram of the relationship curve between the actual SOC value and the actual value.

[0073] Under certain internal group allocation ratios, such as Figures 5A-5B As shown, battery state characteristic values There is a one-to-one correspondence with the actual SOC value. This is based on the battery state characteristic value determined under stable low-load operating conditions. exist Between, it can be based on Figures 5A-5B The curve was used to find the characteristic value of the determined battery state. The actual SOC value that corresponds one-to-one.

[0074] Under other internal group allocation ratios, such as Figure 5C-5F As shown, although the battery state characteristic value The SOC true value relationship curve is not monotonic overall, but the battery state characteristic value There is a one-to-one correspondence between the SOC and the true SOC value at certain intervals or extreme points. These intervals or extreme points with one-to-one correspondence can be used to find the true SOC value. For example... Figure 5C As shown, in There exists a one-to-one corresponding true SOC value. Therefore, the battery state characteristic value determined under the condition of stable operation with low load is... equal At that time, it can be based on Figure 5C The relationship curve shown identifies the unique true SOC value. .like Figure 5D As shown, in There exists a one-to-one corresponding true SOC value. Therefore, the battery state characteristic value determined under the condition of stable operation with low load is... equal At that time, it can be based on Figure 5D The relationship curve shown identifies the unique true SOC value. .like Figure 5E As shown, in Place and interval (excluding) Outside of the specified point, there exists a one-to-one corresponding true SOC value. Therefore, the battery state characteristic value determined under the condition of stable operation under low load is... equal or located in When dealing with intervals, it can be based on Figure 5E The relationship curve shown identifies the unique true SOC value. For example... Figure 5F As shown, in Place and interval (excluding) Outside of the specified point, there exists a one-to-one corresponding true SOC value. Therefore, the battery state characteristic value determined under the condition of stable operation under low load is... equal or located in When dealing with intervals, it can be based on Figure 5F The relationship curve shown reveals the unique true value of SOC.

[0075] Besides the internal component ratio of the battery, the relationship curve between the battery's state-of-the-art (SOC) characteristic value and the actual SOC value is also related to various low-load stable operating conditions. Therefore, the corresponding relationship curves can be tested, calibrated, and stored separately for each low-load stable operating condition. Furthermore, factors such as temperature, discharge current, and / or battery aging factors also affect the SOC characteristic value-actual SOC relationship curve; therefore, the corresponding relationship curves can also be tested, calibrated, and stored separately for these factors.

[0076] In order to obtain accurate true SOC values, multiple battery state characteristic values ​​associated with different internal component ratios of the battery are first obtained from pre-stored data. From the SOC true value relationship curves, identify multiple relationship curves that match the current vehicle battery pack allocation ratio. Then, further identify relationship curves corresponding to the current low-load stable operating condition from these curves. Finally, read the battery state characteristic value determined at 220 from the finally matched relationship curves. The corresponding actual SOC value.

[0077] In some examples, after matching the relationship curve based on the current stable low-load operating conditions, the relationship curve can be further matched based on the aging factor of the vehicle battery. The aging factor of the vehicle battery can be determined based on the number of charge or discharge cycles (e.g., discharge cycles) the vehicle battery has undergone since it left the factory. Generally, the fewer the number of cycles, the smaller the aging factor, and vice versa.

[0078] As mentioned earlier, battery state characteristics There isn't always a one-to-one correspondence between the actual SOC value and the actual value. At 420, a correlation with the battery state characteristic value can be determined. Check if the corresponding actual SOC value contains a unique value. If the actual SOC value contains a unique value, proceed to step 430; otherwise, proceed to step 410 and continue based on the newly calculated battery state characteristic value. Read the corresponding SOC true value from the relationship curve.

[0079] At 430, the displayed SOC value of the vehicle battery is corrected based on the actual SOC value.

[0080] In some embodiments, the displayed SOC value can be directly corrected to the actual SOC value.

[0081] In some embodiments, the displayed SOC value of the vehicle battery can be corrected based on a charge change correction factor.

[0082] In some examples, the battery change correction factor can be determined based on user correction requirements. User correction requirements refer to the user's expectation of the correction rate for the SOC display value. The expected correction rate can be mapped to multiple correction rate levels, and the correspondence between correction rate levels and battery change correction factors can be pre-stored. User correction requirements can be obtained by detecting user input through a human-machine interface (e.g., fast, medium, or slow correction), or by detecting the user's usage level or frequency of use of the SOC display value through onboard sensors. Then, the battery change correction factor corresponding to the obtained user correction requirement is determined from the pre-stored correspondence between correction rate levels and battery change correction factors.

[0083] In some examples, the power consumption correction factor can be determined based on the displayed SOC value, the actual SOC value, and the user's correction request. In other examples, the displayed SOC value, the actual SOC value, and the user's correction request can be input into a pre-trained model to determine the power consumption correction factor. For example, the displayed SOC value, the actual SOC value, and the user's usage level or frequency of use of the displayed SOC value, as determined previously, can be input into a pre-trained model to obtain the power consumption correction factor; or the displayed SOC value, the actual SOC value, and the correction speed level, as determined previously, can be input into a pre-trained model to obtain the power consumption correction factor.

[0084] In some examples, the power variation correction factor can be determined based on the displayed SOC value, the actual SOC value, and the target SOC value. The power variation correction factor may include a rate current integral coefficient, and this rate current integral coefficient can vary with the displayed SOC value, the actual SOC value, and the target SOC value; for example, the rate current integral coefficient. The calculation method can be shown in the following formula (2):

[0085] (2)

[0086] The SOC target value can be a user-defined target value, or it can be the minimum value at discharge cutoff, i.e., 0%, by default.

[0087] In some examples, a current integration correction method based on the rate current integral coefficient can be used to correct the displayed SOC value of the vehicle battery. The following uses the rate current integral coefficient... For example, assume that the battery bus discharge current at time t is The corrected SOC display value at time t+1 can be determined by the following formula (3), and the true SOC value at time t+1 can be determined by the following formula (4):

[0088] (3)

[0089] (4)

[0090] in, It is a positive value. This refers to the battery capacity.

[0091] Using formula (2) The correction method of formula (3) can make the displayed SOC value and the actual SOC value reach the target SOC value at the same time.

[0092] In real-world scenarios, the SOC display correction device 150 may power down before the displayed SOC value and the actual SOC value reach the target SOC value. In this case, the latest corrected displayed SOC value and the actual SOC value can be recorded as the initial values ​​for the next power-on correction of the SOC display correction device 150. After the next power-on, the calculations in formulas (3) and (4) above are continued to correct the displayed SOC value until both the displayed SOC value and the actual SOC value reach the target SOC value simultaneously.

[0093] During the above SOC display value correction process, the correction process ends when the displayed SOC value matches the actual SOC value.

[0094] Next, a specific example will be used to illustrate in detail the method for correcting the SOC display value during the discharge process.

[0095] In this example, the relevant battery parameters are as follows: battery capacity = 10Ah, battery temperature = 25℃, discharge current = 2A, and SOC display value = 40%. Furthermore, the SOC display value correction device 150 pre-stores battery state characteristic values ​​under stable low-load operating conditions with a battery temperature of 25℃ and a discharge current of 2A. -SOC true value relationship curve. On this relationship curve, when the battery state characteristic value At that time, there is a unique and certain true value of SOC equal to 20%.

[0096] When the vehicle battery meets the stable operating conditions under low load, if the battery state characteristic value at time t is determined based on the operating parameters collected by the operating parameter monitoring device 120... Then, based on the pre-stored battery state characteristic values The SOC true value relationship curve can be used to obtain the corresponding SOC true value of 20%.

[0097] Assuming the target SOC value is 0%, the integral coefficient of the rate current can be determined by substituting the displayed SOC value of 40%, the actual SOC value of 20%, and the target SOC value into the above formula (2). .

[0098] Assuming the vehicle battery continues to discharge at a current of 2A for 0.5 hours, the displayed SOC value and the actual SOC value after 0.5 hours are as follows: Displayed SOC value = (0.4 - 2 * 2 * 0.5 / 10) * 100% = 20%, Actual SOC value = (0.2 - 2 * 0.5 / 10) * 100% = 10%.

[0099] Assuming the vehicle battery continues to discharge at a current of 2A for 0.5 hours, the displayed SOC value and the actual SOC value after 0.5 hours are as follows: Displayed SOC value = (0.2 - 2 * 2 * 0.5 / 10) * 100% = 0%, Actual SOC value = (0.1 - 2 * 0.5 / 10) * 100% = 0%.

[0100] This shows that both the displayed SOC value and the actual SOC value reach the target SOC value (0%).

[0101] In some embodiments, the correction mode can also be determined based on the displayed SOC value and the actual SOC value. If the displayed SOC value is close to the actual SOC value (e.g., within a threshold range), the actual SOC value can be directly used to replace the displayed SOC value; otherwise, the displayed SOC value can be gradually corrected to the actual SOC value based on the power change correction factor.

[0102] The aforementioned use of the power change correction coefficient can gradually and progressively correct the displayed SOC value to the true SOC value, preventing jumps in the displayed SOC value and improving the driver's driving experience.

[0103] The aforementioned SOC display value correction method determines whether the vehicle battery is under a low-load stable operating condition based on its operating parameters. When the vehicle battery is under a low-load stable operating condition, it determines the battery state characteristic value. This battery state characteristic value indicates the ratio of the change in battery voltage to the change in battery capacity per unit time. Based on this battery state characteristic value, the SOC display value of the vehicle battery is corrected. This provides more opportunities to correct the SOC display value under low-load stable operating conditions such as low-speed driving or parking. Furthermore, the battery state characteristic value determined under low-load stable operating conditions... It can eliminate the polarization effect caused by the battery operating current and ensure that the polarization effect is based on the battery state characteristics. It can accurately determine the true value of SOC, thereby improving the reliability of the driver's driving decisions and the user experience.

[0104] As per the above reference Figure 1 Figure 5 illustrates a vehicle and a method for correcting the State of Charge (SOC) display value of a vehicle battery according to an embodiment of this specification. In the embodiments of this specification, the SOC display value correction device can be implemented as a hardware physical device or as a software component.

[0105] Figure 6 An example block diagram of a SOC display value correction device 600 according to an embodiment of this specification is shown.

[0106] like Figure 6As shown, the SOC display value correction device 600 includes an operating condition determination unit 610, a battery state characteristic value determination unit 620, and an SOC correction unit 630.

[0107] The operating condition determination unit 610 is configured to determine whether the vehicle battery is in a low-load stable operating condition based on the vehicle battery's operating parameters, including the bus discharge current and current output parameters. The operation of the operating condition determination unit 610 can be referenced above. Figure 2 The operation described in step 210.

[0108] The battery state characteristic value determination unit 620 is configured to determine the battery state characteristic values ​​of the vehicle battery in response to the vehicle battery being in a low-load stable operating condition. The battery state characteristic values ​​indicate the ratio of the change in battery voltage to the change in battery capacity per unit time. The operation of the battery state characteristic value determination unit 620 can be referenced above. Figure 2 The operation described in step 220.

[0109] The SOC correction unit 630 is configured to correct the displayed SOC value of the vehicle battery based on battery state characteristic values. The operation of the SOC correction unit 630 can be referenced above. Figure 2 The operation described in step 230.

[0110] Figure 7 An example block diagram of an operating condition determination unit 700 according to an embodiment of this specification is shown.

[0111] like Figure 7 As shown, the operating condition determination unit 700 includes a first operating condition determination module 710, an output parameter determination module 720, and a second operating condition determination module 730.

[0112] The first operating condition determination module 710 is configured to determine whether the vehicle battery is under a low-load operating condition based on the bus discharge current of the vehicle battery. The operation of the first operating condition determination module 710 can be referenced above. Figure 3 The operation described in step 310.

[0113] The output parameter determination module 720 is configured to determine the current output parameters of the vehicle battery when the vehicle battery is operating under low load conditions. The operation of the output parameter determination module 720 can be referenced above. Figure 3 The operation described in step 320.

[0114] The second operating condition determination module 730 is configured to determine that the vehicle battery is in a low-load stable operating condition when the current output parameters indicate that the vehicle battery is in a steady-state current output condition. The operation of the second operating condition determination module 730 can be referenced above. Figure 3 The operation described in step 340.

[0115] Figure 8 An example block diagram of a SOC correction unit 800 according to an embodiment of this specification is shown.

[0116] like Figure 8 As shown, the SOC correction unit 800 includes a SOC real value acquisition module 810 and a SOC display value correction module 820.

[0117] The SOC true value acquisition module 810 is configured to acquire the SOC true value corresponding to the battery state characteristic value from the SOC true value relationship curve corresponding to the vehicle's operating conditions. The operation of the SOC true value acquisition module 810 can be referenced above. Figure 4 The operation described in step 410.

[0118] The SOC display value correction module 820 is configured to correct the displayed SOC value of the vehicle battery based on the true SOC value when the true SOC value contains a unique value. The operation of the SOC display value correction module 820 can be referenced above. Figure 4 The operation described in step 430.

[0119] In some embodiments, the SOC display value correction module 820 is configured to correct the SOC display value to the actual SOC value.

[0120] In some embodiments, the SOC display value correction module 820 is configured to correct the SOC display value of the vehicle battery based on a charge change correction factor. In some examples, the charge change correction factor may be determined based on user correction requirements. In some examples, the charge change correction factor may be determined based on the SOC display value, the actual SOC value, and the target SOC value. In some examples, the charge change correction factor may be determined based on the SOC display value, the actual SOC value, and user correction requirements.

[0121] In some examples, the charge change correction factor includes a rate current integral factor, which can be used to correct the vehicle battery's SOC display value using a current integral correction method based on the rate current integral factor.

[0122] In some embodiments, the SOC correction unit 800 may further include an aging factor determination module (not shown), configured to determine the aging factor of the vehicle battery. The SOC true value acquisition module 810 is further configured to acquire the SOC true value corresponding to the battery state characteristic value from the battery state characteristic value-SOC true value relationship curve corresponding to the vehicle's operating conditions and aging factor.

[0123] As per the above reference Figures 1 to 8This specification describes a method, apparatus, and vehicle for correcting the State of Charge (SOC) display value of a vehicle battery according to embodiments thereof. The aforementioned SOC display value correction apparatus can be implemented in hardware, software, or a combination of both.

[0124] Figure 9 An example schematic diagram of a SOC display value correction device 900 implemented based on a computer system according to an embodiment of this specification is shown. Figure 9 As shown, the SOC display value correction device 900 may include at least one processor 910, a memory (e.g., non-volatile memory) 920, a memory 930, and a communication interface 940, and the at least one processor 910, the memory 920, the memory 930, and the communication interface 940 are connected together via a bus 950. The at least one processor 910 executes at least one computer-readable instruction (i.e., the elements implemented in software above) stored or encoded in the memory.

[0125] In one embodiment, computer-executable instructions are stored in a memory that, when executed, cause at least one processor 910 to: determine whether the vehicle battery is in a low-load stable operating condition based on operating parameters of the vehicle battery, including bus discharge current and current output parameters; determine a battery state characteristic value of the vehicle battery in response to the vehicle battery being in a low-load stable operating condition, the battery state characteristic value indicating the ratio of the change in battery voltage to the change in battery capacity per unit time; and correct the displayed SOC value of the vehicle battery based on the battery state characteristic value.

[0126] It should be understood that the computer-executable instructions stored in memory, when executed, cause at least one processor 910 to perform the above-described combinations in the various embodiments of this specification. Figures 1-8 The description includes various operations and functions.

[0127] According to one embodiment, a program product, such as a machine-readable medium (e.g., a non-transitory machine-readable medium), is provided. The machine-readable medium may have instructions (i.e., the elements implemented in software as described above), which, when executed by a machine, cause the machine to perform the above-described combinations of the various embodiments of this specification. Figures 1-8 The various operations and functions described. Specifically, a system or apparatus equipped with a readable storage medium storing software program code that implements the functions of any of the embodiments described above, and enabling the computer or processor of the system or apparatus to read and execute the instructions stored in the readable storage medium.

[0128] In this case, the program code itself, which can be read from a readable medium, can perform the functions of any of the above embodiments. Therefore, the machine-readable code and the readable storage medium storing the machine-readable code constitute a part of the present invention.

[0129] Examples of readable storage media include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD-RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code can be downloaded from a server computer or the cloud via a communication network.

[0130] According to one embodiment, a computer program product is provided, the computer program product including a computer program, which, when executed by a processor, causes the processor to perform the above-described combinations of the various embodiments of this specification. Figures 1-8 The description includes various operations and functions.

[0131] It should be noted that not all steps and units in the above process and system structure diagrams are mandatory; some steps or units can be omitted according to actual needs. The execution order of each step is not fixed and can be determined as needed. The device structure described in the above embodiments can be a physical structure or a logical structure; that is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0132] In the above embodiments, the hardware units or modules can be implemented mechanically or electrically. For example, a hardware unit, module, or processor may include permanent dedicated circuitry or logic (such as a dedicated processor, FPGA, or ASIC) to perform the corresponding operation. The hardware unit or processor may also include programmable logic or circuitry (such as a general-purpose processor or other programmable processor), which can be temporarily configured by software to perform the corresponding operation. The specific implementation method (mechanical, dedicated permanent circuitry, or temporarily configured circuitry) can be determined based on cost and time considerations.

[0133] The specific embodiments described above with reference to the accompanying drawings are exemplary embodiments, but do not represent all embodiments that can be implemented or fall within the scope of the claims. The term "exemplary" as used throughout this specification means "serving as an example, instance, or illustration" and does not imply that it is "preferred" or "advantageous" compared to other embodiments. Specific details are included to provide an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, well-known structures and apparatuses are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0134] The foregoing description of this disclosure is provided to enable any person skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. A method for correcting the displayed state of charge (SOC) value of a vehicle battery, comprising: Determine whether the vehicle battery is in a stable low-load operating condition based on the vehicle battery's operating parameters, including bus discharge current and current output parameters. In response to the vehicle battery being in a low-load stable operating condition, a battery state characteristic value of the vehicle battery is determined, which is used to indicate the ratio of the change in battery voltage to the change in battery capacity per unit time. as well as Correcting the displayed SOC value of the vehicle battery based on the battery state characteristic value, wherein correcting the displayed SOC value of the vehicle battery based on the battery state characteristic value includes: Obtain the true SOC value corresponding to the battery state characteristic value from the relationship curve between the battery state characteristic value and the true SOC value corresponding to the vehicle's operating conditions; and When the true SOC value contains a unique value, the displayed SOC value of the vehicle battery is corrected based on the true SOC value.

2. The method as described in claim 1, wherein, Correcting the displayed SOC value of the vehicle battery based on the actual SOC value includes: The displayed SOC value is corrected to the actual SOC value.

3. The method as described in claim 1, wherein, Correcting the displayed SOC value of the vehicle battery based on the actual SOC value includes: The displayed SOC value of the vehicle battery is corrected based on the power change correction factor.

4. The method of claim 3, wherein, The method of correcting the displayed SOC value of the vehicle battery based on the actual SOC value also includes: The power change correction coefficient is determined based on the user's correction requirements; The power change correction coefficient is determined based on the displayed SOC value, the actual SOC value, and the target SOC value; or The power change correction coefficient is determined based on the displayed SOC value, the actual SOC value, and the user's correction requirements.

5. The method as described in claim 3 or 4, wherein, The charge change correction coefficient includes a rate current integral coefficient, and correcting the SOC display value of the vehicle battery based on the charge change correction coefficient includes: The SOC display value of the vehicle battery is corrected using a current integral correction method based on the said rate current integral coefficient.

6. The method of claim 1, wherein, Correcting the displayed SOC value of the vehicle battery based on the battery state characteristic value also includes: Determine the aging factor of the vehicle battery. Obtaining the true SOC value corresponding to the battery state characteristic value from the relationship curve between the battery state characteristic value and the true SOC value corresponding to the vehicle's operating conditions includes: Obtain the true SOC value corresponding to the battery state characteristic value from the relationship curve between the battery state characteristic value and the aging factor, which corresponds to the vehicle's operating conditions and the aging factor.

7. The method of claim 1, wherein, Determining whether the vehicle battery is operating under a low-load stable condition based on its operating parameters includes: The vehicle battery is determined to be operating under low load conditions based on the bus discharge current of the vehicle battery. Under low-load operating conditions, determine the current output parameters of the vehicle battery; and When the current output parameter indicates that the vehicle battery is in a steady-state current output condition, it is determined that the vehicle battery is in a stable low-load operating condition.

8. An apparatus for correcting the displayed state of charge (SOC) value of a vehicle battery, comprising: The operating condition determination unit is configured to determine whether the vehicle battery is in a low-load stable operating condition based on the operating parameters of the vehicle battery, the operating parameters including bus discharge current and current output parameters. A battery state characteristic value determination unit is configured to determine the battery state characteristic value of the vehicle battery in response to the vehicle battery being in a low-load stable operating condition. The battery state characteristic value is used to indicate the ratio of the change in battery voltage to the change in battery capacity per unit time. as well as A SOC correction unit is configured to correct the displayed SOC value of the vehicle battery based on the battery state characteristic value, wherein the SOC correction unit includes: The SOC true value acquisition module is configured to acquire the SOC true value corresponding to the battery state characteristic value from the battery state characteristic value-SOC true value relationship curve corresponding to the vehicle's operating condition; and The SOC display value correction module is configured to correct the SOC display value of the vehicle battery based on the true SOC value when the true SOC value contains a unique value.

9. A vehicle comprising: Vehicle battery; An operating parameter monitoring device is configured to monitor the operating parameters of the vehicle battery; The display value determining device is configured to determine the SOC display value of the vehicle battery; The vehicle's instrument cluster is configured to display a determined SOC (State of Charge) value. as well as The apparatus for correcting the displayed state of charge (SOC) value of a vehicle battery according to claim 8.

10. An apparatus for correcting the displayed state of charge (SOC) value of a vehicle battery, comprising: At least one processor; Memory coupled to the at least one processor; as well as A computer program stored in the memory, which is executed by the at least one processor to implement a method for correcting the displayed state of charge (SOC) value of a vehicle battery according to any one of claims 1 to 7.

11. A computer-readable storage medium storing executable instructions that, when executed, cause a processor to perform a method for correcting a displayed state of charge (SOC) value of a vehicle battery according to any one of claims 1 to 7.

12. A computer program product comprising a computer program executed by a processor to implement a method for correcting the displayed state of charge (SOC) value of a vehicle battery according to any one of claims 1 to 7.

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