CN-116053622-B - Charging remaining time calculation method, electric automobile and storage medium

CN116053622BCN 116053622 BCN116053622 BCN 116053622BCN-116053622-B

Abstract

The application discloses a charging remaining time calculation method, an electric automobile and a storage medium, and relates to the technical field of charging time estimation, wherein the method comprises the steps of obtaining charging interval dividing parameters corresponding to charging initial temperature; the method comprises the steps of determining a charging interval set calculated by remaining time to be charged according to charging interval dividing parameters and initial SOC, determining a plurality of temperature durations corresponding to each charging interval in the charging interval set according to a temperature-SOC parameter table and charging initial temperature to obtain charging durations corresponding to the charging intervals one by one, wherein each temperature duration corresponds to the duration of temperature change of the charging interval under a group of temperature-SOC parameters in the temperature-SOC parameter table, and obtaining the remaining charging duration of the battery according to the charging durations corresponding to each charging interval in the charging interval set. According to the embodiment of the application, the charging time length is calculated by combining the influences of different charging initial temperatures on the charging intervals and the change condition of the temperature of each charging interval, so that the estimation accuracy is higher.

Inventors

Pan Binbiao
LI JIANJIE
YI XINGYUN

Assignees

欣旺达电动汽车电池有限公司

Dates

Publication Date: 20260508
Application Date: 20221025

Claims (10)

1. A charging remaining time calculation method, characterized by comprising: Acquiring a charging interval dividing parameter corresponding to a charging initial temperature at the current moment; determining a charging interval set for calculating the remaining time to be charged according to the charging interval dividing parameter and the initial SOC, wherein the charging interval dividing parameter is used for dividing a charging process into a plurality of SOC skip intervals, and the charging interval set at least comprises one charging interval; Determining a plurality of temperature durations corresponding to each charging interval in the charging interval set according to a preset temperature-SOC parameter table and the charging initial temperature, and obtaining charging durations corresponding to the charging intervals one by one according to the plurality of temperature durations, wherein each temperature duration corresponds to the duration of temperature change of the charging interval in one temperature interval in the temperature-SOC parameter table, each charging interval corresponds to at least one temperature interval in one SOC interval in the temperature-SOC parameter table, each charging interval comprises at least one calculation interval, the calculation intervals are divided by the temperature intervals, the temperature duration corresponding to each calculation interval is a first duration when a first jump condition is met or a second duration when a second jump condition is met, the charging durations are obtained by accumulating the temperature durations of the calculation intervals corresponding to the charging intervals, the first duration is calculated by a first time interval The second time period ; The interval start temperature of the calculation interval is indicated, The section end temperature of the calculation section is indicated, The interval temperature change rate of the corresponding calculation interval; a first end SOC corresponding to the charging interval is indicated, A second interval start SOC representing a corresponding calculation interval; Is the average current; the first time length is smaller than the second time length when the first skip condition is met, and the second time length is larger than or equal to the second time length when the second skip condition is met; And obtaining the residual charging duration of the battery according to the charging duration corresponding to each charging interval in the charging interval set.
2. The charging remaining time calculation method according to claim 1, wherein the determining a charging interval set to be charged for remaining time calculation according to the charging interval division parameter and a start SOC includes: determining a plurality of SOC skip intervals corresponding to the whole charging process according to the charging interval dividing parameters and a preset skip calculation formula; And matching the initial SOC with the plurality of SOC skip intervals, and determining a charging interval set to be calculated for the remaining time.
3. The method according to claim 2, wherein the jump calculation formula is used for characterizing a relationship between the internal resistance of the battery and the SOC jump interval, the method further comprising: In the charging process, updating the battery internal resistance of the corresponding SOC skip zone in the charging zone dividing parameters according to a skip formula and a preset first updating rule, so as to determine the plurality of SOC skip zones according to the updated charging zone dividing parameters and the skip calculating formula in the next charging residual time calculation, wherein the updating rule is used for judging whether to update the battery internal resistance of the corresponding SOC skip zone in the charging zone dividing parameters.
4. The method of claim 1, wherein determining a plurality of temperature durations corresponding to each charging interval in the set of charging intervals according to a preset temperature-SOC parameter table and the charging start temperature, and obtaining charging durations corresponding to the charging intervals one-to-one according to the plurality of temperature durations, comprises: Respectively selecting charging intervals which are not subjected to temperature duration calculation from the charging interval set as charging intervals to be calculated; Obtaining temperature-SOC interval parameters to be calculated according to the temperature-SOC parameter table, the interval charging initial temperature of the charging interval to be calculated and the first interval initial SOC, wherein the temperature-SOC interval parameters comprise interval initial temperature, interval ending temperature, interval temperature change rate and second interval initial SOC; Calculating to obtain a first duration according to the interval starting temperature, the corresponding interval ending temperature and the interval temperature change rate; Calculating to obtain a second duration according to the second interval starting SOC and the first ending SOC of the charging interval to be calculated; performing jump matching on the first time length and the second time length; when the jump matching result meets a first jump condition, taking the first time length as one temperature duration in the charging interval to be calculated and re-determining the next temperature-SOC interval parameter to be calculated until the jump matching result corresponding to the next temperature-SOC interval parameter to be calculated meets a second jump condition; when the jump matching result meets a second jump condition, taking the second time length as one temperature time length in the charging interval to be calculated and re-determining the next charging interval to be calculated until the charging interval set does not have the charging interval to be calculated; And adding the temperature duration in the charging interval to be calculated to obtain the charging duration corresponding to the charging interval to be calculated one by one.
5. The charge remaining time calculation method according to claim 4, wherein obtaining the temperature-SOC interval parameter to be calculated from the temperature-SOC parameter table, the interval charge start temperature of the charging interval to be calculated, and the first interval start SOC, comprises: When the temperature-SOC interval parameter to be calculated corresponds to a first calculation interval in the charging interval to be calculated, setting an interval starting temperature of the temperature-SOC interval parameter to be calculated as the corresponding interval charging starting temperature, and setting a second interval starting SOC of the temperature-SOC interval parameter to be calculated as the corresponding first interval starting SOC; When the temperature-SOC interval parameter to be calculated does not correspond to a first calculation interval in the charging interval to be calculated, setting an interval start temperature of the temperature-SOC interval parameter to be calculated as an interval end temperature of a previous temperature-SOC interval parameter, and setting a second interval start SOC of the temperature-SOC interval parameter to be calculated as a sum of a second SOC variation value corresponding to the previous temperature-SOC interval parameter and a corresponding second interval start SOC; And matching the currently determined interval starting temperature and the second interval starting SOC with the temperature-SOC parameter table to obtain an interval temperature change rate and an interval ending temperature of the temperature-SOC interval parameter to be calculated.
6. The method according to claim 4, wherein calculating a second duration from the second interval start SOC and the first end SOC of the charging interval to be calculated includes: subtracting the first ending SOC of the charging interval to be calculated from the second interval starting SOC to obtain a first SOC variation value; Acquiring the full charge capacity corresponding to the charging interval to be calculated and the calculated current of the calculating interval corresponding to the temperature-SOC interval parameter; Multiplying the first SOC variation value by the full charge capacity to obtain a first product; And dividing the first product by the calculated current to obtain the second duration.
7. The charge remaining time calculation method according to claim 6, wherein when the temperature-SOC interval parameter corresponds to a first calculation interval under a first charging interval in the charge interval set, the calculation current is an average current at a corresponding time; When the temperature-SOC interval parameter does not correspond to a first calculation interval in a first charging interval in the set of charging intervals, the calculation current is determined by: Obtaining the maximum output current of a charger limited in a CML message of quick charge interaction generated in the charging process; Calculating to obtain the allowable charging current of the battery according to the temperature range and the internal resistance of the battery corresponding to the temperature-SOC interval parameter; The minimum value of the maximum output current and the battery allowable charging current is taken as the calculated current.
8. The charge remaining time calculation method according to claim 1, wherein the temperature-SOC parameter table is used to record a plurality of sets of SOC intervals and a temperature change rate at the temperature intervals, the method further comprising: In the charging process, when a group of SOC intervals and temperature changes corresponding to the temperature intervals exist in the temperature-SOC parameter table and meet a preset second updating rule, the temperature change rates corresponding to the group of SOC intervals and the temperature intervals are updated to be the temperature change rates corresponding to the temperature changes.
9. An electric vehicle, characterized by comprising a battery and a charge remaining time calculation system, the charge remaining time calculation system comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the charge remaining time calculation method according to any one of claims 1 to 8 when executing the program.
10. A computer readable storage medium, characterized in that it stores a computer program executable by a terminal, which when run on the terminal causes the terminal to perform the steps of the method according to any of claims 1-8.

Description

Charging remaining time calculation method, electric automobile and storage medium Technical Field The present application relates to the field of charging time estimation technologies, and in particular, to a charging remaining time calculation method, an electric vehicle, and a storage medium. Background The remaining charge time is a time taken from any time to the time when the battery is charged to an off state, and is typically full charge, and may be charged to a predetermined SOC. For the existing fast charging mode, aiming at the constant-current charging mode of stepped-down current, the calculation of charging time is divided into low-temperature time, normal-temperature charging time and high-temperature charging time. The low-temperature charging time is calculated through the calibrated heating time during charging in the low-temperature interval, and the charging time is calculated after the temperature is raised to the normal temperature. When the high-temperature interval is charged, the high-temperature charging time is calculated through the calibrated cooling time, and then the charging time is calculated after the temperature is reduced to the normal temperature. The normal temperature time is calculated by accumulating the time of different SOC segment intervals. However, the temperature interval is divided greatly in this way, and the battery pack difference is not considered, so that the estimation accuracy of the remaining time is poor. Disclosure of Invention The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a charging remaining time estimation method, an electric vehicle and a storage medium, which can realize the estimation of the battery charging remaining time and improve the estimation precision. In a first aspect, the present application proposes a method for calculating a remaining charge time, including: Acquiring a charging interval dividing parameter corresponding to a charging initial temperature at the current moment; Determining a charging interval set for calculating the remaining time to be charged according to the charging interval dividing parameters and the initial SOC; Determining a plurality of temperature durations corresponding to each charging interval in the charging interval set according to a preset temperature-SOC parameter table and the charging initial temperature, and obtaining charging durations corresponding to the charging intervals one by one according to the plurality of temperature durations, wherein each temperature duration corresponds to the duration of temperature change of the charging interval in one temperature interval in the temperature-SOC parameter table; And obtaining the residual charging duration of the battery according to the charging duration corresponding to each charging interval in the charging interval set. In a second aspect, the application provides an electric vehicle, comprising a battery and a charge remaining time calculation system, wherein the charge remaining time calculation system comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and the processor realizes the charge remaining time calculation method according to any one of the first aspects when executing the program. In a third aspect, the present application proposes a computer readable storage medium storing a computer program executable by a terminal, the program, when run on the terminal, causing the terminal to perform the steps of the method of any one of the first aspects. According to the embodiment of the application, the method has the advantages that the preset charging interval dividing parameters are obtained through the charging initial temperature, so that the charging interval set calculated by the remaining time to be charged is obtained, and a plurality of temperature durations corresponding to each charging interval in the charging interval set are determined according to the temperature-SOC parameter table and the charging initial temperature, so that the charging duration corresponding to each charging interval can be obtained. Therefore, the charging remaining time calculation method of the embodiment of the application calculates the charging time by combining the influences of different charging initial temperatures on the charging intervals and combining the change condition of the temperature of each charging interval, and compared with the prior art, the method of the application more finely distinguishes the temperature change and can adapt to battery packs with more structures, so that the estimation accuracy of the charging remaining time in the application is higher. Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Dr