CN-122008879-A - Electric automobile residual electric quantity prediction method and system

CN122008879ACN 122008879 ACN122008879 ACN 122008879ACN-122008879-A

Abstract

The invention provides a method for predicting the residual capacity of an electric vehicle, which comprises the following steps of determining an initial rated capacity value of a power battery of the electric vehicle, obtaining operation state parameters of the power battery of the electric vehicle, correcting the initial rated capacity value according to the operation state parameters of the power battery to obtain corrected rated capacity, and determining the residual capacity of the electric vehicle based on the corrected rated capacity and discharge current. By the method, the corresponding correction factors are formed by considering the actual working condition factors including the factors of temperature, current, depth of discharge, service time and the like, and then the rated capacity of the power battery is corrected by the correction factors, so that the accurate rated capacity is determined, the residual electric quantity state of the power battery is ensured to be basically consistent with the actual state, the error indication phenomenon of the residual electric quantity is avoided, and more accurate data support is provided for the reference and maintenance of the residual electric quantity of the subsequent user trip.

Inventors

ZHAO HONGLIANG
SHU YONG
QUE YUMING
SHEN WEI
LI HAITAO
QIN HANG
WANG XIAOYAN
GOU XIAOGUI

Assignees

重庆宗申机车工业制造有限公司

Dates

Publication Date: 20260512
Application Date: 20260107

Claims (8)

1. The method for predicting the residual electric quantity of the electric automobile is characterized by comprising the following steps of: Determining an initial rated capacity value of a power battery of the electric automobile; Acquiring operation state parameters of a power battery of the electric automobile, wherein the operation state parameters comprise deep discharge times, battery working temperature, discharge current and battery service time; correcting the initial rated capacity value according to the running state parameters of the power battery to obtain corrected rated capacity; And determining the residual electric quantity of the electric vehicle based on the corrected rated capacity and the discharge current.
2. The method for predicting the residual capacity of an electric vehicle of claim 1, wherein the step of correcting the initial rated capacity value according to the operation state parameter of the power battery to obtain the corrected rated capacity comprises the following steps: the method comprises the following steps of: ; Wherein: Indicating that the corrected rated capacity is to be provided, Indicating the temperature influence factor of the battery, Representing the deep discharge impact factor of the battery, Representing the high current discharge impact factor of the battery, Representing the service time factor of the battery.
3. The method for predicting remaining power of an electric vehicle according to claim 2, wherein the battery temperature influence factor is determined by : ; Wherein T represents the temperature at which the battery operates, Indicating the upper limit value of the operating temperature range specified by the power battery, Indicating that the working temperature T of the power battery exceeds B is a constant coefficient, e represents a natural constant.
4. The method for predicting residual electric power of an electric vehicle according to claim 2, wherein the deep discharge influencing factor of the battery is determined by : ; Wherein: The number of deep discharge times of the power battery of the electric automobile is represented, Indicating the incomplete deep discharge times of the power battery of the electric automobile, The number of times of complete deep discharge of the power battery of the electric automobile is indicated, 、 And Representing constant coefficients.
5. The method for predicting residual electric power of an electric vehicle according to claim 2, wherein the battery high-current discharge influence factor is determined by : ; Wherein: Indicating that the maximum discharge current allowed by the power battery is less than or equal to Coefficient of influence of current discharge in a state on capacity, Indicating that the maximum discharge current allowed by the power battery is greater than that of the power battery The influence coefficient of discharge on capacity in the state, I is the discharge current of the power battery, Representing the high current duration factor.
6. The method for predicting the residual electric quantity of the electric vehicle according to claim 2, wherein the determining the residual electric quantity of the electric vehicle based on the corrected rated capacity and the discharge current is specifically: SOC represents the actual state of charge of the power battery.
7. The electric automobile residual electric quantity prediction system is characterized by comprising a detection unit and a controller; the detection unit is used for detecting and outputting the running state parameters of the power battery of the electric automobile; The controller is configured to receive the operation state parameter output by the detection unit, and determine a remaining power state of the electric vehicle according to the remaining power prediction method according to any of claims 1-6 according to the operation state parameter.
8. The residual electric quantity prediction system of the electric automobile of claim 7, wherein the detection unit comprises a current sensor and a temperature sensor, the current sensor is used for detecting the discharge current of the power battery of the electric automobile, and the temperature sensor is used for detecting the working temperature of the power battery of the electric automobile.

Description

Electric automobile residual electric quantity prediction method and system Technical Field The invention relates to the field of electric vehicles, in particular to a method and a system for predicting the residual electric quantity of an electric vehicle. Background Electric vehicles are widely used at present, and the state of the residual electric quantity of a power battery of the electric vehicle is an important index of the electric vehicle when the electric vehicle is in operation, so that the accurate estimation and maintenance of the residual endurance mileage of the electric vehicle are related. In the prior art, the state of charge of a power battery of an electric vehicle is calculated asIn the calculation method, the consumption capacity of the power battery is calculated by acquiring the discharge current I and the continuous discharge time t of the electric automobile, then the calculation is carried out based on the initial rated capacity C, the initial use period of the electric automobile (namely, the electric automobile newly delivered in a certain use time range) is more accurate, but the rated capacity of the power battery of the electric automobile is reduced along with the service time, in the existing calculation, the attenuation of the rated capacity of the battery is not considered, so that the residual capacity is not accurately estimated, for example, the initial rated capacity is assumed to be 100 amperes, the rated capacity is reduced to be 80 amperes, if the discharge electric quantity is 30 amperes, the residual electric quantity state is (100-30)/100 according to the traditional calculation, the actual state of the residual electric quantity is 70 percent, the actual state of the residual electric quantity is (80-30)/80, and the actual state of the residual electric quantity is 62.5 percent, in this case, the actual use of the electric quantity of the electric automobile is influenced, the residual electric quantity is easy to be caused by the attenuation of the battery rated capacity, and the residual electric quantity is easy to be damaged in midway, and the actual electric quantity of the user is damaged when the actual electric quantity is not damaged, and the maintenance measures are also influenced. Therefore, in order to solve the above-mentioned technical problems, a new technical means is needed. Disclosure of Invention In view of the above, the present invention aims to provide a method and a system for predicting the remaining power of an electric vehicle, in which when predicting the remaining power of a power battery, factors including temperature, current, depth of discharge, service time and the like are considered to form corresponding correction factors, and then the rated capacity of the power battery is corrected by the correction factors, so as to determine an accurate rated capacity, ensure that the remaining power state of the power battery is basically consistent with the actual state, avoid a phenomenon of error indication of the remaining power, and provide more accurate data support for reference and maintenance of the remaining power of a subsequent user trip. The invention provides a method for predicting the residual electric quantity of an electric automobile, which comprises the following steps: Determining an initial rated capacity value of a power battery of the electric automobile; Acquiring operation state parameters of a power battery of the electric automobile, wherein the operation state parameters comprise deep discharge times, battery working temperature, discharge current and battery service time; correcting the initial rated capacity value according to the running state parameters of the power battery to obtain corrected rated capacity; And determining the residual electric quantity of the electric vehicle based on the corrected rated capacity and the discharge current. Further, correcting the initial rated capacity value according to the running state parameter of the power battery, wherein the obtaining the corrected rated capacity specifically comprises the following steps: the method comprises the following steps of: ; Wherein: Indicating that the corrected rated capacity is to be provided, Indicating the temperature influence factor of the battery,Representing the deep discharge impact factor of the battery,Representing the high current discharge impact factor of the battery,Representing the service time factor of the battery. Further, the battery temperature influence factor is determined by the following method: ; Wherein T represents the temperature at which the battery operates,Indicating the upper limit value of the operating temperature range specified by the power battery,Indicating that the working temperature T of the power battery exceedsB is a constant coefficient, e represents a natural constant. Further, the battery deep discharge influence factor is determined by the following method: ; Wherein: The number of dee