CN116653611A

CN116653611A - Method and device for determining residual battery capacity, electronic equipment and vehicle

Info

Publication number: CN116653611A
Application number: CN202310842173.7A
Authority: CN
Inventors: 姜苏
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2023-07-10
Filing date: 2023-07-10
Publication date: 2023-08-29

Abstract

The application provides a method, a device, electronic equipment and a vehicle for determining the residual capacity of a battery, which can control the power battery to discharge according to the required target residual capacity and correct the residual capacity according to a preset electric quantity change rate on the premise of allowing the electric quantity of the power battery to be corrected if the required target residual capacity is smaller than or equal to an original target residual capacity. The power battery is controlled to discharge according to the required target residual electric quantity, so that the power battery is separated from a voltage platform section, the residual electric quantity correction according to the preset electric quantity change rate is realized by actively creating working conditions conforming to the residual electric quantity correction, the accumulated 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 the lowest voltage protection of the battery is triggered, the vehicle stall is further avoided, and the driving safety is ensured.

Description

Method and device for determining residual battery capacity, electronic equipment and vehicle

Technical Field

The present application relates to the field of vehicle technologies, and in particular, to a method and an apparatus for determining a remaining battery power, an electronic device, and a vehicle.

Background

The power battery carried by the plug-in hybrid vehicle is generally divided into ternary lithium and lithium iron phosphate, and when the plug-in hybrid vehicle carrying the lithium iron phosphate battery is inconvenient to charge or personal habit causes that the vehicle works in a hybrid mode for a long time, the lithium iron phosphate battery is not charged. The lithium iron phosphate power battery has a larger voltage platform interval because of the characteristics of the lithium iron phosphate power battery, the voltage and the residual electric quantity of the power battery lose the linear characteristics in the interval, the residual electric quantity cannot be corrected through a static or charge-discharge behavior method, so that accumulated errors are gradually increased, the problem that the real capacity of the battery cannot be truly displayed, the vehicle is made to run inaccurately is caused, and further the problem that the power battery possibly has transition discharge to cause physical polarization or trigger the lowest voltage protection of the battery to cause the vehicle to stall is caused, and driving danger is generated.

Disclosure of Invention

Accordingly, the present application is directed to a method and apparatus for determining remaining battery power, an electronic device, and a vehicle for solving the problem that the remaining battery power cannot be corrected.

Based on the above object, a first aspect of the present application provides a method for determining a remaining battery power, including:

Calculating throughput of the power battery;

determining an online correction interval according to the current temperature of the power battery and a preset voltage and electric quantity characteristic curve in response to the throughput being greater than or equal to a preset throughput threshold;

determining the required target residual capacity of the power battery according to the online correction interval;

determining whether to allow electric quantity correction of the power battery according to current vehicle state information;

responding to the permission of electric quantity correction of the power battery, and comparing the required target residual electric quantity with a preset original target residual electric quantity;

and responding to the required target residual electric quantity less than or equal to the original target residual electric quantity, controlling the power battery to discharge according to the required target residual electric quantity, and correcting the residual electric quantity according to a preset electric quantity change rate.

A second aspect of the present application provides a determination apparatus of remaining battery power, comprising:

a throughput computing module configured to: calculating throughput of the power battery;

a correction interval confirmation module configured to: determining an online correction interval according to the current temperature of the power battery and a preset voltage and electric quantity characteristic curve in response to the throughput being greater than or equal to a preset throughput threshold;

A required power confirmation module configured to: determining the required target residual capacity of the power battery according to the online correction interval;

a correction judgment module configured to: determining whether to allow electric quantity correction of the power battery according to current vehicle state information;

the power comparison module is configured to: responding to the permission of electric quantity correction of the power battery, and comparing the required target residual electric quantity with a preset original target residual electric quantity;

a power correction module configured to: and responding to the required target residual electric quantity less than or equal to the original target residual electric quantity, controlling the power battery to discharge according to the required target residual electric quantity, and correcting the residual electric quantity according to a preset electric quantity change rate.

A third aspect of the application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method as provided in the first aspect of the application when executing the program.

A fourth aspect of the application provides a vehicle comprising the apparatus as provided in the second aspect of the application.

From the above, it can be seen that the method, the device, the electronic device and the vehicle for determining the battery residual capacity provided by the application can calculate the throughput of the power battery, and determine the online correction interval according to the current temperature of the power battery and the preset voltage-electricity characteristic curve when the throughput is greater than or equal to the preset throughput threshold; and then, determining the required target residual capacity of the power battery according to the online correction interval, and on the premise of allowing the electric quantity correction of the power battery, if the required target residual capacity is smaller than or equal to the original target residual capacity, controlling the power battery to discharge according to the required target residual capacity, and carrying out residual capacity correction according to the preset electric quantity change rate. The power battery is controlled to discharge according to the required target residual electric quantity, so that the power battery is separated from a voltage platform section, the residual electric quantity correction according to the preset electric quantity change rate is realized by actively creating working conditions conforming to the residual electric quantity correction, the accumulated 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 the lowest voltage protection of the battery is triggered, the vehicle stall is further avoided, and the driving safety is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a schematic diagram of an OCV-SOC curve according to an embodiment of the present application;

FIG. 2 is a flowchart of a method for determining a remaining battery power according to an embodiment of the present application;

FIG. 3 is a flowchart of determining an online correction interval according to an embodiment of the present application;

FIG. 4 is a flowchart of determining a current residual capacity according to an embodiment of the present application;

FIG. 5 is a schematic diagram of OCV-SOC curves at different temperatures according to an embodiment of the present application;

FIG. 6 is a flow chart of the power correction according to the embodiment of the application;

fig. 7 is a schematic structural diagram of a device for determining a remaining battery power according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the application.

Detailed Description

The present application will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In this document, it should be understood that any number of elements in the drawings is for illustration and not limitation, and that any naming is used only for distinction and not for any limitation.

Based on the above description of the background art, there are also the following cases in the related art:

the State of Charge (SOC) of the power battery is also referred to as the State of Charge. The ratio of the remaining capacity to the total available capacity, commonly expressed as a percentage, is expressed after the power cell has been in use or has been left to stand for a long period of time.

The open circuit voltage (Open circuit voltage, OCV) of a power cell refers to the terminal voltage of the cell in an open circuit condition. The open circuit voltage of the power cell is equal to the difference between the positive electrode potential and the negative electrode potential of the power cell when the power cell is open circuit (i.e. no current passes through the poles), expressed as V-on, i.e. v=Φ ⁺ -Ф ^- Wherein phi is ⁺ 、Ф ^- Respectively the positive and negative electrode potentials of the power battery. In practical calculation, it can be considered that a voltmeter is connected to the open circuit, and the voltmeter reading is the open circuit voltage.

The State of Health (SOH) of the power battery is the remaining available capacity of the power battery.

When the lithium iron phosphate battery is used as a power battery, as shown in fig. 1, the voltage-charge characteristic curve (OCV-SOC curve) of the lithium iron phosphate battery in different health states can be shown, the change of the open circuit voltage of the lithium iron phosphate power battery is relatively gentle in a long section, when the OCV-SOC curve is relatively steep, the OCV and the SOC can well correspond to each other, however, the middle of the OCV-SOC curve of the lithium iron phosphate battery is basically flat except for jump at two ends, the section of relatively stable SOC section is the voltage platform section of the lithium iron phosphate power battery, in the voltage platform section, the OCV and the SOC of the power battery lose the linear characteristic, so that the open circuit voltage correction function cannot work in the flat voltage platform section, and the real capacity of the power battery cannot be truly displayed, and the problem of inaccurate cruising of the vehicle is caused. The SOC display is inaccurate, and can have a great influence on driving safety, and is mainly reflected in the following two cases:

In the first case, the actual SOC is smaller than the estimated SOC, and in this case, if the power battery is discharging (e.g., climbing a hill), the SOC may possibly jump to 0, resulting in the vehicle losing power.

In the second case, the actual SOC is greater than the estimated SOC, in which case if the power battery is always charging (e.g., downhill), the SOC may suddenly jump to 100, resulting in the vehicle losing the braking force for kinetic energy recovery.

In the related art, the method for correcting the residual electric quantity includes: static correction, full correction, limit correction, and dynamic correction.

Static correction: the power battery is in a static mode (without load), an OCV table is inquired, corresponding SOC values under voltage and temperature are generated according to an OCV-SOC curve, then the SOC is corrected after the next load moment, and the integral smoothing correction is accelerated or slowed down to a target value at a certain speed, so that the scheme is simple and easy to realize;

however, the current is required to be approximately equal to the vicinity of static power consumption, the load voltage is waited to rebound to the no-load voltage for a certain time, the next load time is corrected, the condition is more, the applicable working condition is limited, and the on-line correction can not be performed when the load is not carried.

Filling correction: for example, if the SOC in the charging mode is equal to 99.4%, the ampere-hour integral calculation is stopped, the SOC is kept unchanged until the full charge condition is reached (the full charge voltage and the charging current are the minimum charging allowable current when the single-section highest voltage reaches the current temperature), and the SOC jumps to 100%; the charging completion can be satisfied, the current is stopped, and the SOC is just corrected to 100%;

However, the definition of the full charge condition is different, and because the aging voltage difference of the battery core becomes larger, the strategy of judging whether the monomer reaches the full charge voltage at the highest is not comprehensive, if the judgment of the monomer reaches the full charge voltage at the lowest is not only carried out, the judgment of the monomer reaches the full charge voltage at the highest, although the judgment is comprehensive, the full charge failure possibly occurs, and the SOC can only be stopped at 99.4% and cannot be corrected to 100%.

Limit correction: in a discharging mode, the single-section lowest voltage is continuously lower than a threshold boundary point for a certain time and directly jumps to 0%, and the SOC is quickly and smoothly tracked to 0% at a higher speed; in the charging mode, the single-section highest voltage is higher than a threshold value for a certain time and is higher than a full-charge voltage point but lower than a safety protection point, and is directly corrected to 100%; SOC satisfies the display value of 100% full and 0% empty.

However, since only the highest cell is concerned during charging and the lowest cell is concerned during discharging, if the remaining power is corrected to 100% or 0% directly after the limit correction is triggered, the power battery is likely to be underfilled or not discharged.

Dynamic correction: the method is characterized in that under the condition that the power battery is in dynamic discharge, if the discharge current is greater than 10A and is stable continuously for a period of time, the current actual SOC and the actual SOC can be calculated through a table lookup, the deviation condition is compared, then the correction coefficient K is calculated through a table lookup, and the SOC can be corrected at any time without limitation of conditions for ampere-hour integration and retrograde correction;

However, the algorithm is slightly complicated to implement, the internal resistance is greatly changed along with temperature and aging, the impedance table must be updated in time by considering the influence of temperature and aging, and the practical use is difficult.

According to the method, the device, the electronic equipment and the vehicle for determining the residual capacity of the battery, which are provided by the embodiment of the application, the throughput of the power battery can be calculated, and when the throughput is greater than or equal to the preset throughput threshold, an online correction interval is determined according to the current temperature of the power battery and the preset voltage and electric quantity characteristic curve; and then, determining the required target residual capacity of the power battery according to the online correction interval, and on the premise of allowing the electric quantity correction of the power battery, if the required target residual capacity is smaller than or equal to the original target residual capacity, controlling the power battery to discharge according to the required target residual capacity, and carrying out residual capacity correction according to the preset electric quantity change rate. The power battery is controlled to discharge according to the required target residual electric quantity, so that the power battery is separated from a voltage platform section, the residual electric quantity correction according to the preset electric quantity change rate is realized by actively creating working conditions conforming to the residual electric quantity correction, the accumulated 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 the lowest voltage protection of the battery is triggered, the vehicle stall is further avoided, and the driving safety is ensured.

In some embodiments, as shown in fig. 2, a method for determining a remaining battery power includes:

step 201: the method calculates the throughput of the power cell.

The specific implementation method comprises the following steps: step 2011: acquiring the current battery capacity and the current output current of the power battery;

step 2012: and calculating the throughput of the power battery by adopting an ampere-hour integration method according to the current battery capacity and the current output current.

Ampere-hour integration (also known as current integration or coulomb counting) is a classical SOC estimation method. That is, when the battery is charged or discharged, the charge and discharge amount is accumulated to estimate the residual amount of charge SOC, and the ampere-hour integration method is that at the initial time SOC ₀ On the basis of which the SOC of the battery is estimated. And calculating the percentage of the changed electric quantity by calculating the integral of the charge and discharge current and the corresponding time within a certain time, and finally solving the difference between the initial SOC and the changed SOC, namely the residual electric quantity. The ampere-hour integrating method equivalent the battery to a closed system, only researching the external characteristics of the battery, namely only monitoring the electric quantity entering and exiting the battery in real time and then accumulating the electric quantity in the test process,the remaining capacity of the battery at any time can be obtained.

The calculation formula is as follows:

When the current is stable (approximately constant), it can be expressed simply as:

wherein SOC is _now (SOC) represents the throughput of the power battery at the current time, SOC _past Indicating throughput, SOC, of power battery at last moment ₀ Indicating the electric quantity of the power battery at the initial moment, I _now Current of the current moment of the power battery is represented, t represents time, i (t) represents a function of current change along with time, and C _max (Q ₀ ) Indicating the maximum capacity of the power cell.

The ampere-hour integrating method has errors in calculation due to ampere-hour metering, and the accumulated errors are larger and larger along with the increase of the service time, so that the single adoption of the ampere-hour integrating method for estimating the SOC of the battery cannot achieve a good effect. The open circuit voltage method is based on the principle that the open circuit voltage and the SOC have a relatively fixed functional relationship (e.g., as shown in fig. 1) under the condition that the battery is left standing for a long time, so that the SOC is estimated from the open circuit voltage. The battery has higher precision when standing for a long time, but is not applicable to actual working conditions, so that the open circuit voltage method and the ampere-hour integration method are generally combined together to jointly predict the SOC.

Step 202: and 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 voltage and electric quantity characteristic curve.

In particular, as can be seen from fig. 1, when the power battery is discharged, the open circuit voltage and the residual power are in a linear one-to-one correspondence relationship when the residual power is 100% to 95%, so that 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, taking the voltage-electricity characteristic curve of the lithium iron phosphate battery shown in fig. 1 as an example, the throughput threshold may be 5%, the voltage plateau interval at the current temperature is [95%,30% ], the online correction interval at the current temperature is [30%,0% ], and then the remaining electricity of the platen interval may be corrected by using the online correction interval having a one-to-one correspondence linear relationship.

Step 203: and determining the required target residual capacity of the power battery according to the online correction interval.

In specific implementation, the temperature of the power battery is always changed during the operation process, and the range of the online correction interval is reduced due to the possibility of aging, so that the online correction interval is [30%,0% ] for ensuring the accuracy of the correction of the residual electric quantity, the residual electric quantity near 30% (for example + -3%) cannot be selected, and the online correction interval is possibly reduced to [28%,0% ] due to the reasons of temperature or aging and the like. It is also impossible to select a value of the electric quantity lower than the protection electric quantity (for example, 10%) as the required target remaining electric quantity because, as can be seen from fig. 1, if the electric quantity correction is performed at 10%, when the remaining electric quantity is lower than the protection electric quantity, the electric quantity drops very rapidly, the remaining electric quantity is likely to jump suddenly to 0, so that the vehicle loses power, because the electric quantity protection mechanism is triggered after the correction, and the electric quantity is corrected to 0%. Therefore, in order to ensure the accuracy of the residual power correction, the residual power close to the upper boundary value of the line correction interval may be selected as the target residual power for demand, for example, 25%.

Step 204: and determining whether to allow the electric quantity correction of the power battery according to the current vehicle state information.

When the method is implemented, whether the power battery needs target electric quantity to intervene is judged according to the judging zone bit, the driving mode, the environment temperature and the type of the power battery, and when the judging zone bit is a confirmation mark bit, the throughput is larger than or equal to a preset throughput threshold value at the moment, and the residual electric quantity can be corrected; the current driving mode is a non-charging driving mode, which indicates that the power battery is not charged at the moment (because the power battery cannot be discharged and charged at the same time), and the residual electric quantity can be corrected; if the ambient temperature is greater than or equal to a preset safety temperature threshold, the operation environment is not a low-temperature operation environment (the power battery electric quantity at a low temperature is fast in descending speed, electric quantity consumption is saved, intervention electric quantity correction is not easy to carry out), and the residual electric quantity correction can be carried out; if the type of the power battery is a lithium iron phosphate battery, the residual electric quantity can be corrected; when the above conditions are satisfied at the same time, it is determined that the electric quantity correction of the power battery is permitted. If any one of the conditions is not satisfied, the electric quantity correction is not allowed.

Step 205: and in response to the permission of the electric quantity correction of the power battery, comparing the required target residual electric quantity with the preset original target residual electric quantity.

In particular, in order to ensure cruising, the vehicle can automatically set or the user sets an original target residual capacity according to own preference, and when the residual capacity is smaller than or equal to the original target residual capacity, the energy consumption of the power battery is saved, and the power battery is charged under the condition of permission of working conditions. However, when the power electricity allows the electric quantity correction, the required target residual electric quantity and the preset original target residual electric quantity need to be compared, and when the required target residual electric quantity is larger than the original target residual electric quantity, the electric quantity correction can be directly performed; when the required target residual electric quantity is smaller than or equal to the original target residual electric quantity, temporarily not responding to the instruction corresponding to the original target residual electric quantity, and preferentially responding to the required target residual electric quantity to carry out electric quantity correction.

Step 206: and responding to the fact that the required target residual electric quantity is smaller than or equal to the original target residual electric quantity, controlling the power battery to discharge according to the required target residual electric quantity, and correcting the residual electric quantity according to the preset electric quantity change rate.

In specific implementation, the power battery is controlled to discharge according to the required target residual capacity, so that the power battery is separated from a voltage platform interval to the required target residual capacity, the residual capacity is corrected according to the preset electric capacity change rate by actively creating a working condition conforming to the residual capacity correction, for example, the residual capacity is corrected according to the electric capacity change rate of 5% per minute of electric capacity reduction, the displayed electric capacity of the power battery is corrected from 95% to 25% of electric capacity change value of 5% per minute, the electric capacity correction of the power battery is completed, the accumulated error of the power battery is reduced, and the residual capacity is continuously determined according to an open circuit voltage method and/or an ampere-hour integration method in an interval lower than 25% but higher than 10% of the protection electric capacity, so that the real capacity of the power battery can be positively displayed by a vehicle, and the accuracy of vehicle cruising is ensured.

In summary, in the method for determining the remaining battery power according to the embodiment of the present application, in the process of using the power battery, if the required target remaining battery power is less than or equal to the original target remaining battery power under the precondition of allowing the power battery to perform power correction, the power battery is controlled to discharge according to the required target remaining battery power, and the remaining battery is corrected according to the preset power change rate. The power battery is controlled to discharge according to the required target residual electric quantity, so that the power battery is separated from a voltage platform section, the online correction of the residual electric quantity according to the preset electric quantity change rate is realized by actively creating working conditions conforming to the residual electric quantity correction, the accumulated error of the power battery is reduced, the real capacity of the power battery can be displayed by a vehicle, the accuracy of the vehicle endurance is ensured, the power battery is prevented from being excessively discharged or the lowest voltage protection of the battery is prevented from being triggered, the vehicle stall is further avoided, and the driving safety is ensured.

In some embodiments, as shown in fig. 3, the method for determining the remaining battery power further includes:

step 301: and recalculating the throughput of the power battery in response to the completion of the electric power correction or the completion of the full charge correction of the power battery.

In specific implementation, the method for determining the residual battery power provided by the embodiment of the application carries out power correction during discharging, and full charge correction can be adopted during charging: for example, if the SOC in the charging mode is equal to 99.4%, the ampere-hour integral calculation is stopped, the SOC is kept unchanged until the full charge condition is reached (the full charge voltage and the charging current are the minimum charging allowable current when the single-section highest voltage reaches the current temperature), and the SOC jumps to 100%; the charging completion can be satisfied, the current is stopped, and the SOC is corrected to be 100%. After the electric quantity correction is finished or the power battery is fully corrected, the linear relation of the residual electric quantity of the power battery and the open-circuit voltage is met again, and the residual electric quantity can be determined again according to an ampere-hour integration method.

Step 302: and determining the current residual capacity of the power battery according to the new throughput.

In the specific implementation, after the correction is finished, if the new throughput is 5%, the residual electric quantity at the moment is 20%; after the full correction, if the new throughput is 3%, the remaining power at this time is 97%. The residual electric quantity obtained at the moment is not in the voltage platform section, is the real capacity of the power battery which can be displayed by the vehicle, does not need correction, and ensures the accuracy of the continuous voyage of the vehicle.

In some embodiments, as shown in fig. 4, determining the online correction interval according to the current temperature and the preset voltage remaining capacity characteristic curve includes:

step 401: and determining a target characteristic curve in the preset voltage residual capacity characteristic curve according to the current temperature.

In specific implementation, as shown in fig. 5, the SOC-OCV curves measured during the charging and discharging processes of the power battery at 10 ℃, 25 ℃ and 40 ℃ respectively, it can be seen that the influence of the ambient temperature on the OCV of the lithium iron phosphate battery is great, the OCV decays rapidly at low temperature, the OCV increases at high temperature, but the change speed at high temperature is smaller than that at low temperature, i.e. the OCV value at low temperature is lower, but the change of the OCV and the temperature is not in a linear relationship, and the change speed of the OCV is faster as the temperature is lower. The SOC-OCV curve of the power battery is less different at different temperatures, the lower the temperature is, the lower the SOC-OCV curve is, and the deviation speed of the curve at low temperature is greater. The influence of the ambient temperature is considered in the estimation of the capacity of the battery during ampere-hour integral calculation, the internal resistance of the battery under the conditions of low temperature and small SOC value is very large, the battery is easy to excessively heat and damage due to high-current charge and discharge, and the working performance of the lithium iron phosphate battery under the low temperature condition is poor; the consistency of the SOC-OCV curves at different temperatures is high, and the conclusion proves that the temperature characteristics of the lithium iron phosphate battery are clear, and different SOC-OCV curves need to be determined according to the different current temperatures. The relation between the open-circuit voltage OCV and the SOC illustrates an important curve for reflecting the basic performance of the battery, the shapes of the curves of different types of batteries are different, and under the test rule of the same temperature, the repeatability of the SOC-OCV curve is very good, so that the curve shown in FIG. 5 is also a method for correcting the SOC estimation error, a target characteristic curve is determined in a preset voltage residual electric quantity characteristic curve according to the current temperature, and the accuracy of electric quantity correction is further improved.

Step 402: and determining an online correction interval according to the target characteristic curve.

In particular, as can be seen from fig. 1, when the power battery is discharged, the open circuit voltage and the residual power are in a linear one-to-one correspondence relationship when the residual power is 100% to 95%, so that the power of the power battery can be directly determined according to the ampere-hour integration method. However, when the throughput is equal to or greater than the preset throughput threshold, for example, the voltage-electricity characteristic curve of the lithium iron phosphate battery shown in fig. 1 may be 5%, and the remaining electricity is [95%,30% ], the open circuit voltage and the remaining electricity do not satisfy the linear one-to-one correspondence relationship, so [95%,30% ] is determined as the voltage plateau interval. After the voltage platform interval is separated from the voltage platform interval, the open-circuit voltage and the residual electric quantity in the interval [30%,0% ] have a one-to-one correspondence linear relation, and the residual electric quantity in the flattening platform interval can be corrected by on-line correction of the interval [30%,0% ].

In some embodiments, step 203 comprises:

step 2031: the online correction interval is divided into a plurality of selected subintervals.

In specific implementation, since the temperature of the power battery is always changed in the running process, and the range of the online correction interval is possibly reduced due to aging, in order to ensure the accuracy of the correction of the residual electric quantity, the online correction interval can be divided into a plurality of selected subintervals, and the online correction interval is exemplified by four selected subintervals of [30%,0% ] divided into [30%, 27%), [27%, 20%), [20%, 15%) and [15%,0% ], wherein [27%,20% ] can be a low-temperature interval, because the electric quantity of the power battery is rapidly reduced in a low-temperature environment, the selection of a larger residual electric quantity for correction can ensure that the electric quantity of the battery can not trigger low-point protection in a short time after correction, and the correction of the vehicle in the low-temperature environment is ensured. And the (20 percent and 15 percent) is that the electric quantity of the power battery is reduced normally in a normal temperature environment, and the small residual electric quantity is selected for correction, so that the correction accuracy can be improved while the low-point protection can not be triggered in a short time after the correction of the electric quantity of the battery. [30%, 27%) is an error region, and the selection of the required target remaining power in the region is avoided, because the online correction interval may be reduced to [28%,0% ] due to aging or the like. The power protection interval is 15% and 0%, and the residual power is less than or equal to 10% of the protection power, so that in order to avoid triggering the low-point protection in a short time after the power correction, a certain difference value between the required target residual power and the protection power needs to be ensured.

Step 2031: and determining a target selection subinterval in the plurality of selection subintervals according to the current temperature of the power battery.

In specific implementation, the method can take-10 ℃ as a distinguishing point, if the current temperature is lower than-10 ℃ and calculated as low temperature and higher than-10 ℃ and calculated as normal temperature, when the current temperature (the ambient temperature where the power battery is located) is higher than or equal to-10 ℃, the [27%, 20%) or the [20%, 15%) can be taken as a target selection subinterval, and when the current temperature is lower than-10 ℃, the [27%, 20%) can be taken as a target selection subinterval. Because the electric quantity drops rapidly at low temperature, the power battery has enough residual electric quantity to supply power for the vehicle after electric quantity correction.

Step 2031: and determining the required target residual capacity in the target selection subinterval according to the current temperature of the power battery.

When the target selection subinterval is [27%, 20%) or [20%, 15%), 27% or 20% can be selected correspondingly as the required target residual electric quantity; when the target selection subinterval is only [20% and 15%), 20% can be correspondingly selected as the required target residual electric quantity. In order to reserve the remaining power of the power battery as much as possible, the highest remaining power value in the selectable range is generally selected as the desired target remaining power, and in order to improve the accuracy as much as possible, the remaining power value in the median of the selectable range is generally selected as the desired target remaining power, and of course, random selection may be performed in the target interval, which is not limited herein.

In some embodiments, the current vehicle state information includes current zone bit information, current driving mode information, and current temperature information; step 204 comprises:

step 2041: and determining that the flag bit condition is met in response to the current flag bit information being the confirmation flag bit information.

In the implementation, if the throughput is greater than or equal to a preset throughput threshold, sending confirmation flag bit information (for example, 1) to the flag bit, and determining that the flag bit condition is met; if the throughput is less than the preset throughput threshold, non-acknowledgement flag bit information (e.g., 0) is sent to the flag bit, and it is determined that the flag bit condition is not satisfied. When the judgment flag bit is the confirmation flag bit, the throughput is larger than or equal to the preset throughput threshold value at the moment, and the residual electric quantity can be corrected.

Step 2042: and determining that the driving condition is satisfied in response to the current driving mode belonging to the non-charging driving mode.

In particular, if the current driving mode is the non-charging driving mode, it is indicated that the power battery is not being charged at this time, and since the power battery cannot be discharged and charged at the same time, the remaining power correction can be performed. If the current driving mode is a charge driving mode (e.g., a brake recovery mode), it is indicated that the power battery is being charged at this time, and since the power battery cannot be discharged and charged at the same time, the remaining power correction cannot be performed.

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

In the specific implementation, if the ambient temperature is greater than or equal to a preset safety temperature threshold, the ambient temperature is not a low-temperature operation environment at the moment, and the residual electric quantity can be corrected; if the ambient temperature is smaller than the preset safety temperature threshold, the power battery is in a low-temperature running environment, the power battery electric quantity at low temperature is fast in descending speed, electric quantity consumption is saved, intervention electric quantity correction is not needed, and residual electric quantity correction cannot be conducted.

Step 2044: in response to the flag bit condition, the driving condition, and the temperature condition being satisfied simultaneously, it is determined that the electric quantity correction of the power battery is permitted.

In particular, when the flag bit condition, the driving condition and the temperature condition are satisfied at the same time, it is determined that the electric quantity correction of the power battery is permitted. If any one of the conditions is not satisfied, the electric quantity correction is not allowed.

In some embodiments, as shown in fig. 6, the remaining power correction according to the preset power change rate includes:

step 601: and effectively detecting the required target residual electric quantity according to a preset electric quantity range to obtain a detection result.

In specific implementation, considering the influence of factors such as aging and temperature, for example, the preset electric quantity range may be [35%,15% ], because the voltage platform interval may have a situation that the change of the small-section voltage electric quantity is larger, there may be a situation that the selection of the required target residual electric quantity is wrong, for example, the required target residual electric quantity is 65%, at this time, the value of the required target residual electric quantity is obviously unreasonable, the required target residual electric quantity needs to be checked according to the preset electric quantity range may be [35%,15% ], the unreasonable required target residual electric quantity is removed, and the accuracy of electric quantity correction is ensured. When the required target residual capacity is within the preset electric capacity range, determining that the detection result is effective, and when the required target residual capacity is outside the preset electric capacity range, determining that the detection result is ineffective.

Step 602: and determining the current residual capacity of the power battery in response to the detection result that the required target residual capacity is effective.

In specific implementation, when the detection result is that the target power consumption is effective, the current power consumption of the power battery is determined, where the power consumption is the power consumption of the power battery currently displayed, and, for example, in fig. 1, the current power consumption may be always 95% unchanged or slightly reduced, and for example, the current power consumption may be 75%.

Step 603: and determining an electric quantity correction range according to the current residual electric quantity and the current residual electric quantity.

In the specific implementation, the working condition according with the residual power correction is created by actively increasing the output power consumption of the power battery (for example, by means of pure electric driving as much as possible, the power of the power battery is reduced to the required target residual power, for example, 25%), and the current residual power is 75%, the required target residual power is 25%, and the power correction range is [75%,25% ].

Step 604: and carrying out electric quantity correction according to the electric quantity correction range and the electric quantity change rate.

In specific implementation, the electric quantity correction range is [75%,25% ] at the electric quantity change rate of 5% per minute, even if the displayed electric quantity is reduced from 75% at the speed of 5% per minute, for example, the displayed value of the electric quantity per minute is changed once, for example, 70%,65%,60%,55%,50%,45%,40%,35%,30%,25%, when the change is 25% of the required target residual electric quantity, the on-line correction of the residual electric quantity of the power battery is completed, and the electric quantity correction according to the electric quantity change rate can avoid the direct jump of the displayed electric quantity from 75% to 25%, avoid the problem of drivability caused by the step of the residual electric quantity, and cause trouble to the user (the battery may be suspected to have faults and suddenly reduced in a large quantity). And continuously calculating throughput according to ampere-hour integration, and determining display quantification.

It should be noted that, the method of the embodiment of the present application may be performed by a single device, for example, a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the method of an embodiment of the present application, the devices interacting with each other to accomplish the method.

It should be noted that the foregoing describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Based on the same inventive concept, the application also provides a device for determining the residual electric quantity of the battery, which corresponds to the method in any embodiment.

Referring to fig. 7, the apparatus for determining the remaining battery power includes:

the throughput computing module 10 is configured to: calculating the throughput of the power battery according to an ampere-hour integration method;

the correction interval confirmation module 20 is configured to: 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 voltage and electric quantity characteristic curve;

the required power amount confirmation module 30 is configured to: determining the required target residual capacity of the power battery according to the online correction interval;

the correction judgment module 40 is configured to: determining whether to allow electric quantity correction of the power battery according to the current vehicle state information;

the charge comparison module 50 is configured to: responding to the permission of electric quantity correction of the power battery, and comparing the required target residual electric quantity with the preset original target residual electric quantity;

the power correction module 60 is configured to: and responding to the fact that the required target residual electric quantity is smaller than or equal to the original target residual electric quantity, controlling the power battery to discharge according to the required target residual electric quantity, and correcting the residual electric quantity according to the preset electric quantity change rate.

For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, the functions of each module may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.

The device of the foregoing embodiment is configured to implement the method for determining the remaining battery power corresponding to any one of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.

Based on the same inventive concept, the application also provides an electronic device corresponding to the method of any embodiment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for determining the residual electric quantity of the battery according to any embodiment when executing the program.

Fig. 8 shows a more specific hardware architecture of an electronic device according to this embodiment, where the device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 implement communication connections therebetween within the device via a bus 1050.

The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit ), microprocessor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing relevant programs to implement the technical solutions provided in the embodiments of the present disclosure.

The Memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory ), static storage device, dynamic storage device, or the like. Memory 1020 may store an operating system and other application programs, and when the embodiments of the present specification are implemented in software or firmware, the associated program code is stored in memory 1020 and executed by processor 1010.

The input/output interface 1030 is used to connect with an input/output module for inputting and outputting information. The input/output module may be configured as a component in a device (not shown) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.

Communication interface 1040 is used to connect communication modules (not shown) to enable communication interactions of the present device with other devices. The communication module may implement communication through a wired manner (such as USB, network cable, etc.), or may implement communication through a wireless manner (such as mobile network, WIFI, bluetooth, etc.).

Bus 1050 includes a path for transferring information between components of the device (e.g., processor 1010, memory 1020, input/output interface 1030, and communication interface 1040).

It should be noted that although the above-described device only shows processor 1010, memory 1020, input/output interface 1030, communication interface 1040, and bus 1050, in an implementation, the device may include other components necessary to achieve proper operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary to implement the embodiments of the present description, and not all the components shown in the drawings.

The electronic device of the foregoing embodiment is configured to implement the method for determining the remaining battery power corresponding to any one of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.

Based on the same inventive concept, the present application also provides a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the method for determining the remaining battery power according to any of the above embodiments, corresponding to the method of any of the above embodiments.

The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer 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 technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.

The storage medium of the foregoing embodiment stores computer instructions for causing the computer to execute the method for determining the remaining battery power according to any one of the foregoing embodiments, and has the advantages of the corresponding method embodiments, which are not described herein.

Based on the same inventive concept, the application also provides a vehicle corresponding to the method of any embodiment, which comprises the device for determining the residual battery power according to the embodiment, and the method for determining the residual battery power according to any embodiment is realized through the device for determining the residual battery power.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the application as described above, which are not provided in detail for the sake of brevity.

Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present application, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.

While the application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments 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)) may use the embodiments discussed.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are within the spirit and principles of the embodiments of the application, are intended to be included within the scope of the application.

Claims

1. A method for determining a remaining battery power, comprising:

calculating throughput of the power battery;

2. The method as recited in claim 1, further comprising:

recalculating the throughput of the power battery in response to the completion of the charge correction or the completion of the charge correction of the power battery;

and determining the current residual capacity of the power battery according to the new throughput.

3. The method according to claim 1, wherein the determining the online correction interval according to the current temperature and the preset voltage remaining capacity characteristic includes:

determining a target characteristic curve in a preset voltage residual capacity characteristic curve according to the current temperature;

and determining the online correction interval according to the target characteristic curve.

4. The method of claim 1, wherein the determining the required target remaining power of the power battery according to the online correction interval comprises:

Dividing the online correction interval into a plurality of selected subintervals;

determining a target selection subinterval in a plurality of selection subintervals according to the current temperature of the power battery;

and determining the required target residual capacity in the target selection subinterval according to the current temperature of the power battery.

5. The method of claim 1, wherein the current vehicle state information includes current flag information, current driving mode information, and the current temperature;

the determining whether to allow the electric quantity correction of the power battery according to the current vehicle state information comprises the following steps:

determining that the flag bit condition is met in response to the current flag bit information being the confirmed flag bit information;

determining that a driving condition is satisfied in response to the current driving mode belonging to a non-charging driving mode;

determining that a temperature condition is met in response to the current temperature being greater than or equal to a preset safety temperature threshold;

in response to the flag bit condition, the driving condition, and the temperature condition being satisfied simultaneously, it is determined that electric quantity correction of the power battery is permitted.

6. The method of claim 1, wherein the correcting the remaining power according to the preset power change rate includes:

The residual electric quantity of the required target is effectively detected according to a preset electric quantity range, and a detection result is obtained;

determining the current residual capacity of the power battery in response to the detection result that the required target residual capacity is effective;

determining an electric quantity correction range according to the current residual electric quantity and the required target residual electric quantity;

and carrying out electric quantity correction according to the electric quantity correction range and the electric quantity change rate.

7. The method of claim 1, wherein the calculating the throughput of the power cell comprises:

acquiring the current battery capacity and the current output current of the power battery;

and calculating the throughput of the power battery by adopting an ampere-hour integration method according to the current battery capacity and the current output current.

8. A device for determining a remaining battery power, comprising:

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 7 when the program is executed by the processor.

10. A vehicle comprising the apparatus of claim 8.