Method and device for determining remaining battery power, electronic equipment and vehicle

Abstract

The application provides a battery residual capacity determination method and device, electronic equipment and vehicle, which can control the power battery to discharge according to the demand target residual capacity under the premise of allowing the power battery capacity correction, and correct the residual capacity according to the preset capacity change rate if the demand target residual capacity is less than or equal to the original target residual capacity. According to the demand target residual capacity, the power battery is controlled to discharge, so that the power battery is out of the voltage platform interval. The residual capacity is corrected according to the preset capacity change rate by actively creating a working condition that meets the residual capacity correction. The cumulative error of the power battery is reduced, the real capacity of the power battery can be displayed, the accuracy of the vehicle endurance is ensured, the power battery over-discharge or the trigger of the battery minimum voltage protection is avoided, and the vehicle stall is avoided, so that the driving safety is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a method and device for determining remaining battery capacity, an electronic device and a vehicle. BACKGROUND

[0002] The power battery of a plug-in hybrid vehicle is generally divided into ternary lithium and lithium iron phosphate. When the plug-in hybrid vehicle with lithium iron phosphate battery is inconvenient for users to charge or the vehicle is working in hybrid mode for a long time due to personal habits, the lithium iron phosphate battery is not charged. Due to the characteristics of the lithium iron phosphate power battery, there is a large voltage platform interval. In this interval, the voltage and remaining capacity of the power battery lose the linear characteristics, and the remaining capacity cannot be corrected by methods such as standing or charging and discharging, resulting in a gradual increase in cumulative error, causing the vehicle to not truly display the real capacity of the battery, resulting in inaccurate vehicle range, and further causing the power battery to be over-discharged, resulting in physical polarization or triggering the minimum voltage protection of the battery, causing the vehicle to stall and posing a driving risk. SUMMARY

[0003] Therefore, the present application aims to provide a method and device for determining remaining battery capacity to solve the problem of being unable to correct the capacity.

[0004] To achieve the above purpose, the first aspect of the present application provides a method for determining remaining battery capacity, comprising:

[0005] calculating the throughput of the power battery;

[0006] in response to the throughput being greater than or equal to a preset throughput threshold, determining an online correction interval according to the current temperature of the power battery and a preset open-circuit voltage remaining capacity characteristic curve;

[0007] determining the required target remaining capacity of the power battery according to the online correction interval;

[0008] determining whether to allow capacity correction of the power battery according to the current vehicle state information;

[0009] in response to allowing capacity correction of the power battery, comparing the required target remaining capacity with a preset original target remaining capacity;

[0010] in response to the required target remaining capacity being less than or equal to the original target remaining capacity, controlling the power battery to discharge according to the required target remaining capacity, and correcting the remaining capacity according to a preset capacity change rate.

[0011] The second aspect of the present application provides a device for determining remaining battery capacity, comprising:

[0012] a throughput calculation module configured to calculate a throughput of the power battery;

[0013] a correction interval confirmation module configured to, in response to the throughput being greater than or equal to a preset throughput threshold, determine an online correction interval according to a current temperature of the power battery and a preset open-circuit voltage remaining capacity characteristic curve;

[0014] a demand capacity confirmation module configured to determine a demand target remaining capacity of the power battery according to the online correction interval;

[0015] a correction judgment module configured to determine whether to allow the power battery to be subjected to capacity correction according to current vehicle state information;

[0016] a capacity comparison module configured to, in response to the power battery being allowed to be subjected to capacity correction, compare the demand target remaining capacity with a preset original target remaining capacity;

[0017] a capacity correction module configured to, in response to the demand target remaining capacity being less than or equal to the original target remaining capacity, control the power battery to be discharged according to the demand target remaining capacity and to be subjected to remaining capacity correction according to a preset capacity change rate.

[0018] A third aspect of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor implements the method provided in the first aspect of the present application when executing the program.

[0019] A fourth aspect of the present application provides a vehicle comprising the device provided in the second aspect of the present application.

[0020] As can be seen from the above, the method, device, electronic device, and vehicle for determining the remaining battery capacity provided by the present application can calculate the throughput of the power battery, and when the throughput is greater than or equal to a preset throughput threshold, determine an online correction interval based on the current temperature of the power battery and a preset open-circuit voltage remaining capacity characteristic curve; then, determine the target remaining capacity of the power battery based on the online correction interval, and if the target remaining capacity is less than or equal to the original target remaining capacity, control the power battery to discharge based on the target remaining capacity, and perform the remaining capacity correction based on a preset rate of capacity change, provided that the power battery is allowed to be corrected. The power battery is controlled to discharge based on the target remaining capacity, so that the power battery is out of the voltage platform interval, and the remaining capacity correction is performed based on a preset rate of capacity change by actively creating an operating condition that meets the requirements for the remaining capacity correction, thereby reducing the accumulated error of the power battery, allowing the vehicle to correctly display the true capacity of the power battery, ensuring the accuracy of the vehicle's cruising range, avoiding excessive discharge of the power battery or triggering the minimum battery voltage protection, thereby avoiding vehicle stalling and ensuring driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 Schematic diagram of the OCV-SOC curve of an embodiment of the present application;

[0023] Figure 2 This is a flowchart of a method for determining the remaining battery power according to an embodiment of the present application;

[0024] Figure 3 A flowchart for determining an online correction interval for an embodiment of the present application;

[0025] Figure 4 A flowchart for determining the current remaining power in an embodiment of the present application;

[0026] Figure 5 Schematic diagram of OCV-SOC curves at different temperatures in the embodiment of the present application;

[0027] Figure 6 A flow chart showing the power correction process according to an embodiment of the present application;

[0028] Figure 7 This is a schematic structural diagram of a device for determining the remaining battery power according to an embodiment of the present application;

[0029] Figure 8 FIG. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0031] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled in the art to which the present application pertains. The terms "first", "second", and similar terms used in the embodiments of the present application do not denote any order, quantity, or importance, but are merely used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" and "connected" and similar terms do not mean only physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are merely used to indicate relative positions, and when the absolute positions of the described objects are changed, the relative positions can also be changed accordingly.

[0032] In this document, it should be understood that the number of any elements in the accompanying drawings is used for illustration only and not as a limitation, and any naming is merely used for distinction and does not have any limiting meaning.

[0033] Based on the description of the above background art, there are also the following situations in the related art:

[0034] The state of charge (SOC) of a power battery, also known as the state of charge, represents the ratio of the remaining capacity to the total available capacity of the power battery after use or long-term storage for a period of time, usually expressed in percentage.

[0035] The open circuit voltage (OCV) of a power battery refers to the terminal voltage of the battery in an open circuit state. The open circuit voltage of the power battery is equal to the difference between the positive electrode potential and the negative electrode potential of the power battery when the circuit is disconnected (i.e., no current flows through the two poles), denoted as Vopen, i.e., V = Ф + - - wherein Ф + , Ф - are the positive and negative electrode potentials of the power battery, respectively. In actual calculation, it can be regarded as that a voltmeter is connected at the open circuit, and the reading of the voltmeter is the open circuit voltage.

[0036] The state of health (SOH) of the power battery refers to the remaining available capacity of the power battery.

[0037] When the lithium iron phosphate battery is used as the power battery, as shown in an example, the open-circuit voltage-remaining capacity characteristic curve (OCV-SOC curve) of the lithium iron phosphate battery at different states of health is Figure 1 It can be seen that the change of the open-circuit voltage of the lithium iron phosphate power battery is relatively flat for a long time. When the OCV-SOC curve is relatively steep, the OCV and the SOC can be well one-to-one corresponding. However, the OCV-SOC curve of the lithium iron phosphate battery is basically flat in the middle except for the jumps at both ends. The relatively stable SOC interval is the voltage platform interval of the lithium iron phosphate power battery. In the voltage platform interval, the OCV of the power battery loses the linear characteristic of the SOC, which causes the open-circuit voltage correction function to fail to work in the flat voltage platform interval, so that the real capacity of the power battery cannot be truly displayed, and the vehicle endurance is inaccurate. The inaccurate SOC display will have a great impact on driving safety, mainly manifested in the following two cases:

[0038] The first case is that the actual SOC is smaller than the estimated SOC. In this case, if the power battery is always discharging (such as climbing), the SOC may suddenly jump to 0, causing the vehicle to lose power.

[0039] The second case is that the actual SOC is greater than the estimated SOC. In this case, if the power battery is always charging (such as downhill), the SOC may suddenly jump to 100, causing the vehicle to lose the braking force of kinetic energy recovery.

[0040] In the related art, the method for correcting the remaining capacity includes static correction, full correction, limit correction, and dynamic correction.

[0041] The static correction is that the power battery is in a static mode (without load), an OCV table is queried, the corresponding SOC value at the present voltage and temperature is obtained according to the OCV-SOC curve, and then the SOC is corrected at the next load time at a certain rate to accelerate or slow down the ampere-hour integral smoothing correction to the target value. The scheme is simple and easy to implement.

[0042] However, it is necessary to require that the current is approximately equal to the static power consumption, and the load voltage is rebounded to the no-load voltage for a certain time, and then the correction is performed at the next load time. The conditions are more, the applicable working conditions are limited, and the online correction cannot be performed when the load is carried.

[0043] Full correction: for example, when the SOC is equal to 99.4% in the charging mode, the ampere-hour integration calculation is stopped first, the SOC is kept unchanged until the full charging condition is reached (the maximum voltage of the single cell reaches the full voltage at the current temperature and the charging current is the minimum allowed current), and the SOC jumps to 100%. The charging can be completed, the current stops, and the SOC is corrected to 100%.

[0044] However, the full condition definition is different. As the cell aging voltage difference becomes larger, the strategy of only judging whether the maximum single cell reaches the full voltage is not comprehensive. If the judgment of whether the minimum single cell reaches the full voltage is also performed, although it is more comprehensive, full failure may occur, and the SOC can only stop at 99.4%, and cannot be corrected to 100%.

[0045] Limit correction: in the discharging mode, if the minimum voltage of the single cell is lower than the threshold boundary point for a certain time, it is directly jumped to 0%, and the SOC is quickly and smoothly tracked to 0% at a faster speed. In the charging mode, if the maximum voltage of the single cell is higher than the threshold for a certain time and is higher than the full charging voltage point but lower than the safety protection point, it is directly corrected to 100%. The SOC satisfies the full display value of 100% and empty 0%.

[0046] However, since only the maximum single cell is concerned during charging and the minimum single cell is concerned during discharging, if the limit correction is triggered, the remaining capacity is directly corrected to 100% or 0%, which may cause the power battery to be not full or not empty.

[0047] Dynamic correction: for example, when the power battery is in a dynamic discharging state, if the discharging current is greater than 10A and is stable for a period of time, the actual SOC and the actual SOC can be calculated by table lookup, the deviation is compared, and then the correction coefficient K is calculated by table lookup to correct the ampere-hour integration and the reverse correction. The SOC can be corrected at any time without condition restriction.

[0048] However, the algorithm is slightly complex to implement. The internal resistance changes greatly with temperature and aging, and the impedance table must be updated in time considering the influence of temperature and aging. It is difficult to use in practice.

[0049] The method, device, electronic device and vehicle for determining the remaining battery capacity provided in the embodiments of the present application can calculate the throughput of the power battery and, when the throughput is greater than or equal to a preset throughput threshold, determine an online correction interval based on the current temperature of the power battery and a preset open-circuit voltage remaining capacity characteristic curve; then, determine the required target remaining capacity of the power battery based on the online correction interval, and, under the premise that the power battery capacity correction is allowed, if the required target remaining capacity is less than or equal to the original target remaining capacity, control the power battery to discharge based on the required target remaining capacity, and perform the remaining capacity correction based on a preset rate of capacity change. The power battery is controlled to discharge based on the required target remaining capacity, so that the power battery is out of the voltage platform interval, and the remaining capacity correction is performed based on a preset rate of capacity change by actively creating an operating condition that meets the requirements for the remaining capacity correction, thereby reducing the accumulated error of the power battery, allowing the vehicle to correctly display the true capacity of the power battery, ensuring the accuracy of the vehicle's cruising range, avoiding excessive discharge of the power battery or triggering the battery's minimum voltage protection, thereby avoiding vehicle stalling and ensuring driving safety.

[0050] In some embodiments, as Figure 2 As shown, a method for determining the remaining battery power includes:

[0051] Step 201: Calculate the throughput of the power battery.

[0052] In specific implementation, the method includes: Step 2011: obtaining the current battery capacity and current output current of the power battery;

[0053] Step 2012: Calculate the throughput of the power battery using the ampere-hour integration method based on the current battery capacity and the current output current.

[0054] The ampere-hour integration method (also known as the current integration method or coulomb counting method) is a classic SOC estimation method. This method estimates the remaining charge (SOC) by accumulating the amount of charge and discharge during battery charging and discharging. The ampere-hour integration method estimates the battery's SOC based on an initial SOC of 0. By integrating the charge and discharge current over a specific period of time, the percentage change in charge is calculated, ultimately determining the difference between the initial and changed SOCs, representing the remaining charge. The ampere-hour integration method treats the battery as a closed system, focusing only on its external characteristics. During testing, only the amount of charge flowing into and out of the battery is monitored in real time and then accumulated. This method can determine the remaining charge at any given moment.

[0055] The calculation formula is as follows:

[0056]

[0057] When the current is stable (approximately a constant value), it can be simplified as:

[0058]

[0059] SOC (t) = SOC (t-1) + I (t) * C / Q0 now SOC (t) represents the throughput of the power battery at the current time, SOC (t-1) represents the throughput of the power battery at the last time, SOC0 represents the electric quantity of the power battery at the initial time, I (t) represents the current of the power battery at the current time, t represents time, i (t) represents a function of the current changing with time, and C represents the capacity of the power battery. past SOC (t-1) represents the throughput of the power battery at the last time, SOC0 represents the electric quantity of the power battery at the initial time, I (t) represents the current of the power battery at the current time, t represents time, i (t) represents a function of the current changing with time, and C represents the capacity of the power battery. now SOC0 represents the electric quantity of the power battery at the initial time, I (t) represents the current of the power battery at the current time, t represents time, i (t) represents a function of the current changing with time, and C represents the capacity of the power battery. max Q0 represents the maximum capacity of the power battery.

[0060] The ampere-hour integration method has an error in ampere-hour measurement, and the cumulative error will become larger and larger with the increase of the use time, so the ampere-hour integration method alone cannot achieve good results in estimating the SOC of the battery. The principle of the open-circuit voltage method for estimating the SOC is to use the relative fixed function relationship (for example, as shown in FIG. 1) between the open-circuit voltage and the SOC of the battery under the condition of long-time static state, so as to estimate the SOC according to the open-circuit voltage. The accuracy is high in the case of long-time static state of the battery, but it is not applicable in the actual working condition, so the open-circuit voltage method is generally combined with the ampere-hour integration method to jointly predict the SOC. Figure 1

[0061] Step 202: in response to the throughput being greater than or equal to the preset throughput threshold, determining an online correction interval according to the current temperature of the power battery and the preset open-circuit voltage remaining electric quantity characteristic curve.

[0062] Specifically, the online correction interval is determined according to the current temperature of the power battery and the preset open-circuit voltage remaining electric quantity characteristic curve. Figure 1 It can be seen that when the power battery is discharged, the open-circuit voltage and the remaining electric quantity satisfy the one-to-one linear correspondence relationship when the remaining electric quantity is 100% to 95%, so the electric quantity of the power battery can be directly determined according to the ampere-hour integration method. However, when the throughput is greater than or equal to the preset throughput threshold, for example, the open-circuit voltage remaining electric quantity characteristic curve of the lithium iron phosphate battery shown in FIG. 1 is taken as an example, the throughput threshold can be 5%, the voltage platform interval at the current temperature is [95%, 30%], and the online correction interval at the current temperature is [30%, 0%], then the remaining electric quantity of the voltage platform interval can be corrected by using the online correction interval with the one-to-one linear relationship. Figure 1 Step 203: determining the demand target remaining electric quantity of the power battery according to the online correction interval.

[0063]

[0064] ​​In specific implementation, since the temperature of the power battery changes all the time during operation and the power battery may be aged, the range of the online correction interval becomes smaller, so in order to ensure the accuracy of the remaining power correction, the remaining power near 30% (for example, ±3%) in the online correction interval [30%, 0%] cannot be selected as the demand target remaining power. Due to the temperature or aging, the online correction interval may be reduced to [28%, 0%]. The power value lower than the protection power (for example, 10%) cannot be selected as the demand target remaining power, because from Figure 1 It can be seen from the above table that if the power correction is performed at 10%, when the remaining power is lower than the protection power, the power drops very quickly, and the remaining power may suddenly jump to 0, causing the vehicle to lose power, because the power correction is performed at 0% after the correction, and the power protection mechanism is triggered. Therefore, in order to ensure the accuracy of the remaining power correction, the remaining power close to the upper limit of the online correction interval can be selected as the demand target remaining power, for example, 25%.

[0065] Step 204: determining whether the power battery is allowed to perform power correction according to the current vehicle state information.

[0066] In specific implementation, whether the power battery demand target power is allowed to intervene is determined according to the judgment flag, the driving mode, the environmental temperature, and the type of the power battery. When the judgment flag is the confirmation flag, it means that the throughput is greater than or equal to the preset throughput threshold, and the remaining power correction can be performed; the current driving mode is the non-charging driving mode, which means that the power battery is not charging at this time (because the power battery cannot discharge and charge at the same time), and the remaining power correction can be performed; if the environmental temperature is greater than or equal to the preset safety temperature threshold, it means that the current is not a low-temperature operating environment (the power battery power drops quickly at low temperature, and the power consumption should be saved, and the intervention power correction should not be performed), and the remaining power correction can be performed; if the type of the power battery is the lithium iron phosphate battery, the remaining power correction can be performed; when the above conditions are met at the same time, it is determined that the power battery is allowed to perform power correction. If any one of the conditions is not met, the power correction is not allowed.

[0067] Step 205: comparing the demand target remaining power and the preset original target remaining power in response to allowing the power battery to perform power correction.

[0068] In a specific implementation, in order to ensure the endurance, the vehicle automatically sets or the user sets a target original remaining power according to personal preferences. When the remaining power is less than or equal to the target original remaining power, the energy consumption of the power battery is saved, and the power battery is charged when the working condition allows. However, when the power battery allows the power correction, and the demand target remaining power needs to be compared with the preset target original remaining power, when the demand target remaining power is greater than the target original remaining power, the power correction can be directly performed. When the demand target remaining power is less than or equal to the target original remaining power, the instruction corresponding to the target original remaining power is temporarily not responded, and the power correction is preferentially performed according to the demand target remaining power.

[0069] Step 206: in response to the demand target remaining power being less than or equal to the target original remaining power, discharging the power battery according to the demand target remaining power, and correcting the remaining power according to the preset power change rate.

[0070] In a specific implementation, discharging the power battery according to the demand target remaining power makes the power battery deviate from the voltage platform interval to the demand target remaining power. The remaining power is corrected according to the preset power change rate by actively creating a working condition that meets the remaining power correction. For example, the remaining power is corrected at a power change rate of 5% per minute, the displayed power of the power battery is changed by 25% at a rate of 5% per minute, the power correction of the power battery is completed, the cumulative error of the power battery is reduced, and the remaining power is determined according to the open circuit voltage method and / or the ampere-hour integral method in an interval lower than 25% but higher than 10% of the protection power, so that the vehicle can display the real capacity of the power battery and ensure the accuracy of the vehicle endurance.

[0071] In summary, the method for determining the remaining power of the battery provided in the embodiments of the present application discharges the power battery according to the demand target remaining power when the demand target remaining power is less than or equal to the target original remaining power under the premise that the power battery is allowed to correct the power, and corrects the remaining power according to the preset power change rate. Discharging the power battery according to the demand target remaining power makes the power battery deviate from the voltage platform interval. The online correction of the remaining power according to the preset power change rate is realized by actively creating a working condition that meets the remaining power correction, the cumulative error of the power battery is reduced, the vehicle can display the real capacity of the power battery, the accuracy of the vehicle endurance is ensured, the power battery is prevented from being excessively discharged or triggering the minimum voltage protection of the battery, the vehicle is prevented from stalling, and the driving safety is ensured.

[0072] In some embodiments, as shown in Figure 3 the method for determining the remaining power of the battery further includes:

[0073] Step 301: Recalculating the throughput of the power battery in response to the completion of the power correction or the full-charge correction of the power battery.

[0074] In specific implementation, the method for determining the residual capacity of the battery provided by the embodiments of the present application performs the power correction during discharging and the full-charge correction during charging. For example, in the charging mode, the SOC is equal to 99.4%, the ampere-hour integration calculation is stopped first, the SOC remains unchanged, until the full-charge condition is reached (the maximum voltage of the single cell reaches the full-charge voltage at the current temperature and the charging current is the minimum allowed charging current), and the SOC jumps to 100%. The full-charge completion, the current stop and the SOC correction to 100% can be satisfied. After the completion of the power correction or the full-charge correction of the power battery, the residual capacity of the power battery and the open-circuit voltage satisfy the one-to-one linear relationship again, and the residual capacity can be determined again according to the ampere-hour integration method.

[0075] Step 302: Determining the current residual capacity of the power battery according to the new throughput.

[0076] In specific implementation, after the correction, if the new throughput is 5%, the residual capacity at this time is 20%; after the full-charge correction, if the new throughput is 3%, the residual capacity at this time is 97%. The residual capacity obtained at this time is not in the voltage platform interval, which is the real capacity of the power battery that can be displayed by the vehicle and does not need to be corrected, thereby ensuring the accuracy of the vehicle endurance.

[0077] In some embodiments, as shown in FIG. 4, the online correction interval is determined according to the current temperature of the power battery and the preset open-circuit voltage residual capacity characteristic curve, including: Figure 4

[0078] Step 401: Determining a target characteristic curve in the preset open-circuit voltage residual capacity characteristic curve according to the current temperature.

[0079] In specific implementation, as shown in FIG. 4, the target characteristic curve is determined according to the current temperature and the preset open-circuit voltage residual capacity characteristic curve. Figure 5 ​The following figures show the SOC-OCV curves measured during charge and discharge of a power battery at 10°C, 25°C, and 40°C, respectively. It can be seen that ambient temperature significantly affects the OCV of lithium iron phosphate batteries. At low temperatures, the OCV decays rapidly, while at high temperatures, the OCV increases. However, the rate of change at high temperatures is slower than at low temperatures, meaning that the OCV value is lower at low temperatures. However, the relationship between OCV and temperature is not linear; the lower the temperature, the faster the OCV change. The SOC-OCV curves of power batteries vary slightly at different temperatures. The lower the temperature, the lower the SOC-OCV curve, and the faster the curve deviates at low temperatures. The influence of ambient temperature must be considered when calculating ampere-hour integration to estimate battery capacity. At low temperatures and low SOC values, the battery's internal resistance is high. High current charging and discharging can easily lead to overheating and damage. Lithium iron phosphate batteries perform poorly at low temperatures. The SOC-OCV curves are highly consistent across different temperatures. These conclusions clarify the temperature characteristics of lithium iron phosphate batteries, emphasizing the need to determine different SOC-OCV curves based on the current temperature. The relationship between open circuit voltage (OCV) and SOC is an important curve that reflects the basic performance of the battery. The shape of this curve varies for different types of batteries. Under the same temperature test rules, the repeatability of the SOC-OCV curve is very good. Figure 5 The curve shown is also a method for correcting SOC estimation errors. The target characteristic curve is determined in a preset open circuit voltage remaining capacity characteristic curve according to the current temperature, further improving the accuracy of the capacity correction.

[0080] Step 402: Determine an online correction interval according to the target characteristic curve.

[0081] In specific implementation, Figure 1 It can be seen that when the power battery is discharged and the remaining power is between 100% and 95%, the open circuit voltage and the remaining power are in a linear one-to-one correspondence, so the power of the power battery can be directly determined according to the ampere-hour integration method. However, when the throughput is greater than or equal to the preset throughput threshold, for example, Figure 1 Taking the open-circuit voltage and remaining capacity characteristic curve of a lithium iron phosphate battery as an example, the throughput threshold can be 5%. When the remaining capacity is [95%, 30%], the open-circuit voltage and remaining capacity do not have a linear one-to-one correspondence. Therefore, [95%, 30%] is determined as the voltage plateau range. After leaving the voltage plateau range, the open-circuit voltage and remaining capacity in the range [30%, 0%] have a one-to-one linear correspondence. The remaining capacity in the voltage plateau range can be corrected by online correction of the range [30%, 0%].

[0082] In some embodiments, step 203 includes:

[0083] Step 2031: Divide the online correction interval into multiple selected sub-intervals.

[0084] In actual implementation, since the temperature of the power battery changes all the time during operation and aging may occur, which may cause the range of the online correction interval to become smaller, in order to ensure the accuracy of the remaining capacity correction, the online correction interval can be divided into multiple selected subintervals. For example, the online correction interval [30%, 0%] is divided into four selected subintervals [30%, 27%], [27%, 20%], [20%, 15%] and [15%, 0%]. Among them, [27%, 20%] can be a low-temperature interval, because in a low-temperature environment, the power battery capacity decreases rapidly, and selecting a larger remaining capacity for correction can ensure that the battery capacity will not trigger the low-point protection in a short time after correction, thereby ensuring the correction of the vehicle in a low-temperature environment. (20%, 15%) is in a normal temperature environment, the power battery capacity decreases normally, and selecting a smaller remaining capacity for correction can ensure that the battery capacity will not trigger the low-point protection in a short time after correction, while improving the accuracy of the correction. [30%, 27%] is an error region, avoiding selecting the demand target remaining capacity in this region, because the online correction interval may be reduced to [28%, 0%] due to aging and other reasons. [15%, 0%] is a capacity protection interval, because the remaining capacity less than or equal to the protection capacity 10% will trigger the low-power protection, so in order to avoid triggering the low-point protection in a short time after the capacity correction, it is necessary to ensure that there is a certain difference between the demand target remaining capacity and the protection capacity.

[0085] Step 2031: determining the target selected subinterval according to the current temperature of the power battery in the multiple selected subintervals.

[0086] In actual implementation, for example, -10℃ can be used as a dividing point, if the current temperature is lower than -10℃, it is calculated as low temperature, and higher than -10℃, it is calculated as normal temperature. When the current temperature (the temperature of the environment where the power battery is located) is greater than or equal to -10℃, [27%, 20%] or [20%, 15%] can be used as the target selected subinterval, and when the current temperature is less than -10℃, [27%, 20%] is used as the target selected subinterval. Because the capacity decreases rapidly at low temperature, it is necessary to ensure that the power battery has sufficient remaining capacity to power the vehicle after capacity correction.

[0087] Step 2031: determining the demand target remaining capacity according to the current temperature of the power battery in the target selected subinterval.

[0088] In specific implementation, when the target selection sub-interval is [27%, 20%) or [20%, 15%), 27% or 20% can be selected as the demand target residual power; when the target selection sub-interval is only [20%, 15%), 20% can be selected as the demand target residual power. In order to retain as much residual power of the power battery as possible, the highest residual power value in the selectable range is generally selected as the demand target residual power, and in order to improve the accuracy as much as possible, the median residual power value in the selectable range is generally selected as the demand target residual power. Of course, random selection can also be performed in the target interval, which is not limited herein.

[0089] In some embodiments, the current vehicle state information includes current flag bit information, current driving mode information and current temperature information; and step 204 includes:

[0090] Step 2041: determining that the flag bit condition is met in response to the current flag bit information being the confirmation flag bit information.

[0091] In specific implementation, if the throughput is greater than or equal to the preset throughput threshold, the confirmation flag bit information (for example, 1) is sent to the flag bit, and it is determined that the flag bit condition is met; if the throughput is less than the preset throughput threshold, the non-confirmation flag bit information (for example, 0) is sent to the flag bit, and it is determined that the flag bit condition is not met. When the flag bit is determined to be the confirmation flag bit, it indicates that the throughput is greater than or equal to the preset throughput threshold, and the residual power correction can be performed.

[0092] Step 2042: determining that the driving condition is met in response to the current driving mode belonging to the non-charging driving mode.

[0093] In specific implementation, if the current driving mode is the non-charging driving mode, it indicates that the power battery is not charging at this time, and because the power battery cannot discharge and charge at the same time, the residual power correction can be performed. If the current driving mode is the charging driving mode (for example, the brake recovery mode), it indicates that the power battery is charging at this time, and because the power battery cannot discharge and charge at the same time, the residual power correction cannot be performed.

[0094] Step 2043: determining that the temperature condition is met in response to the current temperature being greater than or equal to the preset safety temperature threshold.

[0095] In specific implementation, if the environmental temperature is greater than or equal to the preset safety temperature threshold, it indicates that the low-temperature operating environment does not exist at this time, and the residual power correction can be performed; if the environmental temperature is less than the preset safety temperature threshold, it indicates that the low-temperature operating environment exists at this time, the power battery power decreases rapidly at low temperature, the power consumption should be saved, the intervention power correction is not suitable, and the residual power correction cannot be performed.

[0096] Step 2044: in response to the flag condition, the driving condition and the temperature condition being met at the same time, it is determined that the power battery power correction is allowed to be performed.

[0097] In specific implementation, when the flag condition, the driving condition and the temperature condition are met at the same time, it is determined that the power battery power correction is allowed to be performed. If any one of the conditions is not met, the power correction is not allowed to be performed.

[0098] In some embodiments, as shown in FIG. 6, the remaining power correction according to the preset power change rate includes: Figure 6

[0099] Step 601: according to the preset power range, the demand target remaining power is effectively detected to obtain a detection result.

[0100] In specific implementation, considering the influence of factors such as aging and temperature, the preset power range may be [35%, 15%] for example. Because there may be a small voltage power change in the voltage platform interval, there may be a situation that the demand target remaining power is selected incorrectly, for example, the demand target remaining power is 65%. At this time, the value of the demand target remaining power is obviously unreasonable, and the demand target remaining power needs to be verified according to the preset power range [35%, 15%]. The unreasonable demand target remaining power is removed to ensure the accuracy of the power correction. When the demand target remaining power is within the preset power range, it is determined that the detection result is that the demand target remaining power is effective. When the demand target remaining power is outside the preset power range, it is determined that the detection result is that the demand target remaining power is invalid.

[0101] Step 602: in response to the detection result being that the demand target remaining power is effective, the current remaining power of the power battery is determined.

[0102] In specific implementation, when the detection result is that the demand target remaining power is effective, the current remaining power of the power battery is determined. The remaining power is the current displayed power of the power battery. For example, it may remain at 95% or decrease slightly. The current remaining power may be 75% for example. Figure 1

[0103] Step 603: the power correction range is determined according to the current remaining power.

[0104] In specific implementation, at this time, the working condition conforming to the remaining power correction has been created by actively increasing the output power consumption of the power battery (for example, trying to rely on pure electric driving to make the power of the power battery decrease to the demand target remaining power at a faster speed, for example, 25%). At this time, taking the current remaining power as 75% and the demand target remaining power as 25% for example, the power correction range is [75%, 25%]. ​​

[0105] Step 604: correcting the power according to the power correction range and the power change rate.

[0106] In a specific implementation, the power correction range [75%, 25%] is corrected at a power change rate of 5% per minute, that is, the display power is displayed by decreasing from 75% at a rate of 5% per minute, for example, the display value of the power changes once per minute, for example, 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30%, 25%, when the change is 25% of the required target remaining power, the online correction of the remaining power of the power battery is completed, and the power correction according to the power change rate can avoid the display power from directly jumping from 75% to 25%, avoiding the problem of driving caused by the step of the remaining power, and causing the user to be confused (may suspect that the battery has a fault and the power has suddenly decreased a lot). Continue to calculate the throughput according to the ampere-hour integral, and determine the display quantity.

[0107] It should be noted that the method of the embodiments of the present application can be executed by a single device, such as a computer or a server. The method of the embodiments can also be applied to a distributed scenario, and completed by multiple devices cooperating with each other. In this distributed scenario, one of the multiple devices can only execute one or more steps in the method of the embodiments of the present application, and the multiple devices can interact with each other to complete the method.

[0108] It should be noted that some embodiments of the present application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in a different order than those described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0109] Based on the same inventive concept, the present application also provides a battery remaining power determination device corresponding to any of the above-mentioned embodiment methods.

[0110] Reference Figure 7 The battery remaining power determination device comprises:

[0111] The throughput calculation module 10 is configured to calculate the throughput of the power battery according to the ampere-hour integral method.

[0112] The correction interval confirmation module 20 is configured to, in response to the throughput being greater than or equal to a preset throughput threshold, determine an online correction interval according to the current temperature of the power battery and a preset open-circuit voltage remaining power characteristic curve.

[0113] The demand power amount confirming module 30 is configured to determine the demand target residual power amount of the power battery according to the online correction interval;

[0114] The correction judging module 40 is configured to determine whether the power battery is allowed to be corrected according to the current vehicle state information;

[0115] The power amount comparing module 50 is configured to compare the demand target residual power amount with the preset original target residual power amount in response to the power battery being allowed to be corrected;

[0116] The power correcting module 60 is configured to control the power battery to be discharged according to the demand target residual power amount and to be corrected according to the preset power change rate in response to the demand target residual power amount being less than or equal to the original target residual power amount.

[0117] For the convenience of description, the above apparatus is described in various modules according to functions. Of course, the functions of the modules can be implemented in one or more software and / or hardware in the implementation of the present application.

[0118] The apparatus of the above embodiment is used to implement the corresponding battery residual power amount determining method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein again.

[0119] Based on the same inventive concept, the present application also provides an electronic device corresponding to the method of any of the above embodiments, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the battery residual power amount determining method of any of the above embodiments when executing the program.

[0120] Figure 8 A more specific hardware structure of an electronic device is shown in the embodiment, which can include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040 and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030 and the communication interface 1040 are connected to each other through the bus 1050 for communication within the device.

[0121] The processor 1010 can be implemented by a general CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, etc., for executing related programs to implement the technical solutions provided by the embodiments of the present application.

[0122] The memory 1020 can be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 can store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present specification are implemented by software or firmware, the related program codes are saved in the memory 1020 and are called and executed by the processor 1010.

[0123] The input / output interface 1030 is configured to connect an input / output module to realize information input and output. The input / output module can be configured as a component in the device (not shown in the figure) or can be externally connected to the device to provide corresponding functions. The input device can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device can include a display, a speaker, a vibrator, an indicator light, etc.

[0124] The communication interface 1040 is configured to connect a communication module (not shown in the figure) to realize the communication interaction between the device and other devices. The communication module can realize communication through a wired manner (such as a USB, a network cable, etc.) or through a wireless manner (such as a mobile network, WIFI, Bluetooth, etc.).

[0125] The bus 1050 includes a channel to transmit information between various components (such as the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040) of the device.

[0126] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in the specific implementation process, the device can also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device can also only include the components necessary to implement the embodiments of the present specification, and does not have to include all the components shown in the figure.

[0127] The electronic device of the above embodiments is used to implement the determination method of the battery remaining capacity in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described here.

[0128] Based on the same inventive concept, corresponding to any of the above embodiment methods, the present application also provides a non-transitory computer readable storage medium storing computer instructions for causing the computer to execute the determination method of the battery remaining capacity according to any of the above embodiments.

[0129] The computer readable media of the embodiments can include permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology to store information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0130] The storage medium of the above embodiments stores computer instructions for causing the computer to perform the battery remaining capacity determination method as described in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described here.

[0131] Based on the same inventive concept, the present application also provides a vehicle comprising the battery remaining capacity determination apparatus as described in any of the above embodiments, and implements the battery remaining capacity determination method as described in any of the above embodiments through the battery remaining capacity determination apparatus.

[0132] Those skilled in the art should understand that the above discussion of any of the embodiments is only exemplary and is not intended to imply that the scope (including claims) of the present application is limited to these examples; the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of the different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in detail.

[0133] Additionally, to simplify the description and discussion, and so as not to obscure the embodiments of the application being presented, the well-known functions or constructions of integrated circuit (IC) chips and other components can or can not be shown in the figures and will be omitted as not to unnecessarily obscure the embodiments of the application being presented. Moreover, the apparatus can be shown in block diagram form in order to avoid obscuring the embodiments of the application, and this also acknowledges the fact that the details in regards to the implementation of such block diagram apparatus are highly dependent on the platform within which the application is being implemented (i.e., such details should be well within the purview of one of ordinary skill in the art to implement). Where specific details are set forth in order to describe an illustrative embodiment of the application, it will be apparent to one of ordinary skill in the art that the application can be practiced without, or with variations of, these specific details. Thus, the description is to be considered as illustrative and not restrictive, and the scope of the application should be determined not with reference to the above description, but should be given to the appended claims.

[0134] While the application has been described in connection with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) can use the embodiments discussed.

[0135] Embodiments of the application are intended to cover all such alternatives, modifications and variations as falling within the scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the application should be included in the scope of protection of the application.

Claims

1. A method for determining the remaining battery power, characterized in that: include: Calculate the throughput of power batteries; In response to the throughput being greater than or equal to a preset throughput threshold, determining an online correction interval according to a current temperature of the power battery and a preset open circuit voltage remaining capacity characteristic curve; determining a required target remaining power of the power battery according to the online correction interval; determining whether to allow power battery charge correction according to current vehicle status information; In response to allowing the power battery charge correction, comparing the required target remaining charge with a preset original target remaining charge; wherein the original target remaining charge is a threshold charge value set automatically by the vehicle or set by the user according to their own preference, and determining whether the power battery needs to be charged based on the remaining charge when operating conditions permit; In response to the demand target remaining power being less than or equal to the original target remaining power, the power battery is controlled to discharge according to the demand target remaining power, and the remaining power is corrected according to a preset power change rate.

2. The method according to claim 1, characterized in that Also includes: In response to the completion of the power charge correction or the full charge correction of the power battery, recalculating the throughput of the power battery; The current remaining power of the power battery is determined according to the new throughput.

3. The method according to claim 1, characterized in that The determining of the online correction interval according to the current temperature of the power battery and a preset open circuit voltage remaining capacity characteristic curve includes: Determining a target characteristic curve from a preset open circuit voltage and remaining capacity characteristic curve according to the current temperature; The online correction interval is determined according to the target characteristic curve.

4. The method according to claim 1, wherein The determining the required target remaining power of the power battery according to the online correction interval includes: Dividing the online correction interval into a plurality of selected subintervals; Determining a target selection subinterval from the plurality of selection subintervals according to the current temperature of the power battery; The required target remaining power is determined in the target selection subinterval according to the current temperature of the power battery.

5. The method according to claim 1, wherein The current vehicle status information includes current flag information, current driving mode information and the current temperature; The determining whether to allow the power battery power correction according to the current vehicle state information includes: In response to the current flag information being confirmation flag information, determining that a flag condition is satisfied; In response to the current driving mode being a non-charging driving mode, determining that a driving condition is satisfied; In response to the current temperature being greater than or equal to a preset safety temperature threshold, determining that a temperature condition is satisfied; In response to the flag condition, the driving condition, and the temperature condition being simultaneously satisfied, it is determined that the power battery charge correction is permitted.

6. The method according to claim 1, characterized in that The correcting the remaining power according to the preset power change rate includes: Effectively detect the remaining power of the target demand according to a preset power range to obtain a detection result; In response to the detection result indicating that the required target remaining power is valid, determining a current remaining power of the power battery; Determining a power correction range according to the current remaining power and the required target remaining power; The power correction is performed according to the power correction range and the power change rate.

7. The method according to claim 1, characterized in that The calculation of the throughput of the power battery includes: Obtaining the current battery capacity and current output current of the power battery; The throughput of the power battery is calculated according to the current battery capacity and the current output current by adopting an ampere-hour integration method.

8. A device for determining the remaining battery power, characterized in that: include: The throughput calculation module is configured to: calculate the throughput of the power battery; a correction interval confirmation module, configured to: in response to the throughput being greater than or equal to a preset throughput threshold, determine an online correction interval according to a current temperature of the power battery and a preset open circuit voltage remaining capacity characteristic curve; A required power confirmation module is configured to: determine a required target remaining power of the power battery according to the online correction interval; A correction judgment module is configured to: determine whether to allow the power battery power correction according to the current vehicle state information; a power comparison module configured to: in response to permission to perform power battery power correction, compare the required target remaining power with a preset original target remaining power; wherein the original target remaining power is a threshold power level set automatically by the vehicle or set by the user according to his / her preference, and, if operating conditions permit, determines whether the power battery needs to be charged based on the remaining power; The power correction module is configured to: in response to the demand target remaining power being less than or equal to the original target remaining power, control the power battery to discharge according to the demand target remaining power, and correct the remaining power according to a preset power change rate.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

10. A vehicle, characterized in that: Comprising the device as claimed in claim 8.

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