CN105467323A - Method for detecting the available traveling distance of electric vehicle power battery - Google Patents
Method for detecting the available traveling distance of electric vehicle power battery Download PDFInfo
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- CN105467323A CN105467323A CN201510121441.1A CN201510121441A CN105467323A CN 105467323 A CN105467323 A CN 105467323A CN 201510121441 A CN201510121441 A CN 201510121441A CN 105467323 A CN105467323 A CN 105467323A
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Abstract
The present invention relates to a method for detecting the available traveling distance of an electric vehicle power battery to solve the problem that the calculation of the remaining traveling mileage by using SOC is not accurate in the prior art. The correction method comprises a step of obtaining the current state of charge (SOC) of a power battery, a temperature T, a minimum discharge power P, a power battery minimum SOC value and a power battery maximum SOC value, a step of calculating the discharge energy of the power battery in current SOC value, minimum SOC value and maximum SOC value states according to the obtained parameters, and a step of calculating the percentage SOE of the remaining energy according to the discharge energy. The method has the advantages that the problem that battery SOC value and an actual electric vehicle traveling distance are not in linear correspondence and the available traveling distance of the vehicle can not be correctly reflected is solved. According to the real-time change of the SOC value, the SOE is obtained, the electric vehicle available traveling distance can be obtained correctly in real time, the application range is wide, and the method can be applied to any battery system.
Description
Technical field
The present invention relates to a kind of power battery technology field, especially relate to a kind of detection method of the mileage of electric automobile power battery more accurately.
Background technology
Along with country is to the support energetically of New Energy Industry and promotion, new-energy automobile becomes a great development impetus, and wherein main take pure electric automobile as main development direction.In pure electric automobile, the dump energy in battery is represented at present with the SOC of electrokinetic cell (battery charge state), according to SOC value, driver judges that battery is the need of charging, and judge the residual running mileage of vehicle according to SOC value.
But the SOC value of power battery of pure electric automobile can not dump energy SOE directly in reaction cell, and the available energy of battery directly could reflect the mileage of vehicle, go out to send from the use angle of driver, client, the mileage that the mileage that battery can travel from 100%SOC to 50%SOC can will travel from 50%SOC to 0%SOC more than battery.This is because SOC reflection is battery electric quantity, what SOE reflected is battery remaining power, is a kind of nonlinear corresponding relation between battery electric quantity and the energy content of battery.The calculating of electricity is that the integration of electric current and time by flowing through battery in the unit interval calculates, and energy is then be multiplied by voltage again on the basis of electricity, more complicated in the calculating of energy of comparing, because voltage is larger by electric current influence of fluctuations.
If application number is 201210221333.8, name is called a kind of Chinese invention application of estimation method for remainder mileage of electric automobile, and this patent application discloses following steps: first, in advance every kilometer of energy consumption under acquisition driving model; Then, present battery SOC is obtained; Finally, remaining mileage is drawn according to present battery SOC and the every kilometer of energy consumption implemented under driving model.This patent adopts SOC to estimate mileage number exactly, and this just exists above-mentioned problem, and owing between battery electric quantity and the energy content of battery being a kind of nonlinear corresponding relation, can not react automobile residue accurately by SOC can distance travelled number.
Summary of the invention
The present invention mainly solves in prior art and adopts SOC calculating remaining driving mileage number to there is inaccurate problem, provides a kind of detection method of the mileage of electric automobile power battery accurately.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of detection method of electric automobile power battery mileage, comprises the following steps:
Step one: detect electrokinetic cell, obtains electrokinetic cell current residual electricity SOC, temperature T, minimum discharge power P, the minimum residual electric quantity SOC of electrokinetic cell
l, the highest residual electric quantity SOC of electrokinetic cell
h; The minimum residual electric quantity SOC of electrokinetic cell
l, the highest residual electric quantity SOC
hpre-defined by system, minimum residual electric quantity SOC
lbe generally 0%, and the highest residual electric quantity SOC
hbe generally 100%.
Step 2: the parameter according to obtaining calculates electrokinetic cell current residual electricity SOC, minimum residual electric quantity SOC respectively
l, the highest residual electric quantity SOC
hdischarge energy E under state
c, E
l, E
h; According to battery current residual electricity SOC, temperature T and open-circuit voltage OCV, DC internal resistance R0, polarization resistance R
sbetween corresponding relation, open-circuit voltage OCV, DC internal resistance R0, polarization resistance R can be obtained by tabling look-up
s, and calculate electric current according to these parameters, be counted as battery discharge time according to electric current, draw discharge energy according to discharge time and discharge power.Discharge energy E, E
l, E
haccount form the same.
Step 3: according to discharge energy E
c, E
l, E
hcalculate the number percent SOE of dump energy, then draw the mileage of Current vehicle according to the linear corresponding relation of electrokinetic cell energy and distance travelled.It is non-linear corresponding with actual electrical electrical automobile distance travelled that the inventive method improves battery dump energy SOC in practical application, can not the problem of correct response vehicle range number.The present invention can draw SOE in real time according to the real-time change of SOC value, can obtain electric automobile mileage correctly in real time, and applied widely, can be suitable for any battery system.Directly and the linear corresponding relation of distance travelled of vehicle, the energy content of battery can reflect the mileage of Current vehicle to the energy content of battery more intuitively.
As a kind of preferred version, discharge energy E in step 2
c, E
l, E
hcalculate according to following steps respectively:
A. open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs value is obtained according to electrokinetic cell residual electric quantity, relational query that temperature T is corresponding with between open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs; Executive system stores the mapping table of battery dump energy value, temperature T and open-circuit voltage OCV, and with the mapping table of DC internal resistance R0, polarization resistance Rs.Under known electrokinetic cell residual electric quantity and temperature T situation, draw corresponding open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs value by query relation table.
B. the load terminal voltage Vt of electrokinetic cell electric discharge under detection current state, according to formula
Vt·I＝P
Vt＝OCV-R0·I-Rs·I
Calculate the momentary current I that electrokinetic cell under current state discharges with firm power P, wherein Vt is the load terminal voltage that under current state, electrokinetic cell discharges with firm power P; When calculating, Vt is respectively according to battery current residual electricity SOC, minimum residual electric quantity SOC
l, the highest residual electric quantity SOC
hthe load terminal voltage that under state, electrokinetic cell discharges with firm power P.
C. invariable power t discharge time is derived according to electric current I:
t＝Q0·SOC/I；
Wherein Q0 is the specified total volume under Current Temperatures, and Q0 associates with temperature T-phase, and known temperature T executive system obtains corresponding Q0 by inquiry; T is the time that invariable power P discharges.Q0 is detected by executive system and obtains, and is known conditions.
D. according to t discharge time, discharge energy is calculated:
E＝t·P。E is the energy that under the SOC state of the current calculating of electrokinetic cell, battery system can be released.Discharge energy E is calculated respectively according to step a-d
c, E
l, E
h.
As a kind of preferred version, in step 3, dump energy number percent SOE is:
SOE＝(E
c-E
L)/(E
H-E
L)*100％。
Therefore, advantage of the present invention is: improve battery dump energy SOC in practical application non-linear corresponding with actual electrical electrical automobile distance travelled, can not the problem of correct response vehicle range number.Real-time change according to SOC value draws SOE in real time, can obtain electric automobile mileage correctly in real time, and applied widely, can be suitable for any battery system.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of schematic flow sheet in the present invention;
Accompanying drawing 2 is a kind of schematic flow sheets that in the present invention, discharge energy obtains;
Accompanying drawing 3 is the one two dimension mapping tables of battery dump energy value, temperature T and DC internal resistance R0 in the present invention;
Accompanying drawing 4 is one two dimension mapping tables of battery dump energy value in the present invention, temperature T and open-circuit voltage OCV.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
The detection method of a kind of electric automobile power battery mileage of the present embodiment, as shown in Figure 1, includes following steps:
Step one: executive system detects electrokinetic cell, obtains electrokinetic cell current residual electricity SOC, temperature T, minimum discharge power P, the minimum residual electric quantity SOC of electrokinetic cell
l, the highest residual electric quantity SOC of electrokinetic cell
h; The minimum residual electric quantity SOC of electrokinetic cell
l, the highest residual electric quantity SOC
hpre-defined by executive system, minimum residual electric quantity SOC
lbe 0%, and the highest residual electric quantity SOC
hbe 100%.
Step 2: the parameter according to obtaining calculates electrokinetic cell current residual electricity SOC, minimum residual electric quantity SOC respectively
l, the highest residual electric quantity SOC
hdischarge energy E under state
c, E
l, E
h; The calculation procedure of this discharge energy comprises:
A. open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs value is obtained according to electrokinetic cell residual electric quantity, relational query that temperature T is corresponding with between open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs;
Electrokinetic cell residual electric quantity, data that temperature T is corresponding with between open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs are stored in executive system.Executive system cells known dump energy and temperature T just can obtain corresponding open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs value;
Be illustrated in figure 3 the two-dimentional mapping table of battery dump energy value, temperature T and a DC internal resistance R0.Wherein transverse axis represents battery dump energy, and the longitudinal axis represents DC internal resistance R0, and different colours curve represents the internal resistance value under the different battery dump energy of different temperatures, and each bar curve label 1-7 represents.The order of magnitude of internal resistance value is 1.00E-05 (negative 5 powers of 10), unit ohm.Battery dump energy value, two-dimentional corresponding relation between temperature T and polarization resistance Rs and table one are similar.
Be illustrated in figure 4 the two-dimentional mapping table of a battery dump energy value, temperature T and open-circuit voltage OCV.Wherein transverse axis represents battery dump energy, and the longitudinal axis represents open-circuit voltage OCV, and different colours curve represents the open-circuit voltage OCV under the different battery dump energy of different temperatures, and each bar curve label 1-7 represents.The order of magnitude of open-circuit voltage OCV is 1.00E-04 (negative 4 powers of 10), and unit lies prostrate.
B. the load terminal voltage Vt of electrokinetic cell electric discharge under detection current state, according to formula
Vt·I＝P
Vt＝OCV-R0·I-Rs·I
Calculate the momentary current I that electrokinetic cell under current state discharges with firm power P, wherein Vt is the load terminal voltage that under current state, electrokinetic cell discharges with firm power P;
C. invariable power t discharge time is derived according to electric current I:
t＝Q0·SOC/I；
Wherein Q0 is the specified total volume under Current Temperatures;
D. according to t discharge time, discharge energy is calculated:
E＝t·P。
Step 3: according to discharge energy E
c, E
l, E
hcalculate the number percent SOE of dump energy,
SOE＝(E
c-E
L)/(E
H-E
L)*100％
Then the mileage of Current vehicle is drawn according to the linear corresponding relation of electrokinetic cell energy and distance travelled.Wherein mileage is determined according to the different driving mode of different vehicle, and as specified mileage 200 kilometers, when SOE is 100%, remaining mileage is exactly 200 kilometers, and when SOE is 60%, remaining mileage is exactly 120 kilometers, by that analogy.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (3)
1. a detection method for electric automobile power battery mileage, is characterized in that: comprise the following steps:
Step one: detect electrokinetic cell, obtains electrokinetic cell current residual electricity SOC, temperature T, minimum discharge power P, the minimum residual electric quantity SOC of electrokinetic cell
l, the highest residual electric quantity SOC of electrokinetic cell
h;
Step 2: the parameter according to obtaining calculates electrokinetic cell current residual electricity SOC, minimum residual electric quantity SOC respectively
l, the highest residual electric quantity SOC
hdischarge energy E under state
c, E
l, E
h;
Step 3: according to discharge energy E
c, E
l, E
hcalculate the number percent SOE of dump energy, then draw the mileage of Current vehicle according to the linear corresponding relation of electrokinetic cell energy and distance travelled.
2. the detection method of a kind of electric automobile power battery mileage according to claim 1, is characterized in that discharge energy E in step 2
c, E
l, E
hcalculate according to following steps respectively:
A. open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs value is obtained according to electrokinetic cell residual electric quantity, relational query that temperature T is corresponding with between open-circuit voltage OCV, DC internal resistance R0, polarization resistance Rs;
B. the load terminal voltage Vt of electrokinetic cell electric discharge is detected, according to formula
Vt·I＝P
Vt＝OCV-R0·I-Rs·I
Calculate the momentary current I that electrokinetic cell discharges with firm power P, wherein Vt is the load terminal voltage that under current state, electrokinetic cell discharges with firm power P;
C. invariable power t discharge time is derived according to electric current I:
t＝Q0·SOC/I；
Wherein Q0 is the specified total volume under Current Temperatures;
D. according to t discharge time, discharge energy is calculated:
E＝t·P。
3. the detection method of a kind of electric automobile power battery mileage according to claim 1 and 2, is characterized in that in step 3, dump energy number percent SOE is:
SOE＝(E
c-E
L)/(E
H-E
L)*100％。
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| CN112034360A (en) * | 2020-09-14 | 2020-12-04 | 桑顿新能源科技有限公司 | Method and system for determining residual electric quantity of power battery and related components |
| CN112034360B (en) * | 2020-09-14 | 2023-08-22 | 桑顿新能源科技有限公司 | Method and system for determining residual electric quantity of power battery and related components |
| CN113671387A (en) * | 2021-01-19 | 2021-11-19 | 深圳逸驰云动科技有限公司 | Method and device for estimating electric quantity of lithium battery electric vehicle |
| CN113671387B (en) * | 2021-01-19 | 2024-05-10 | 深圳逸驰新能源科技有限公司 | Electric quantity estimation method and device for lithium battery electric vehicle |
| CN113093012A (en) * | 2021-03-23 | 2021-07-09 | 浙江吉利控股集团有限公司 | Battery energy state detection method, battery energy state detection equipment, storage medium and device |
| CN113815488B (en) * | 2021-09-30 | 2023-07-14 | 华人运通(上海)新能源驱动技术有限公司 | Energy distribution method and device for electric automobile and vehicle |
| CN113815488A (en) * | 2021-09-30 | 2021-12-21 | 华人运通(上海)新能源驱动技术有限公司 | Energy distribution method and device of electric automobile and vehicle |
| CN114089196A (en) * | 2021-11-22 | 2022-02-25 | 河北优控新能源科技有限公司 | Linearization method for acquiring battery pack SOC of pure electric vehicle based on OCV |
| CN114527394A (en) * | 2022-02-24 | 2022-05-24 | 中国第一汽车股份有限公司 | Power battery display SOC calibration method, device, equipment and storage medium |
| CN114633833A (en) * | 2022-04-25 | 2022-06-17 | 江苏小牛电动科技有限公司 | Method, device, equipment and storage medium for determining running parameters of electric bicycle |
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