CN102121973B - Method for testing net energy of electrical vehicle power battery - Google Patents
Method for testing net energy of electrical vehicle power battery Download PDFInfo
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Abstract
本发明公开了一种电动汽车动力电池净能量测试方法，其通过将处于放电截止电压的电池组以额定电流充电至充电截止电压，记录充入的能量，再将电池组以额定电流放电至预设SOC，记录第一次放出的能量，再对电动汽车进行工况循环试验，试验完成后，将电池组以额定电流放电到放电截止电压，记录第二次放出的能量；根据电池组的平均充放电效率获取工况循环试验中电池的能量变化量，根据电池充、放电能量效率模型对工况循环试验电池的能量变化量进行校正，得到工况循环过程中电池实际储存的电能，即电池的净能量。本方法一方面考虑了充放电效率对电池净能量的影响，测试准确度高，另一方面只需测出电动汽车在测试前后充进与放出的能量，方法容易实现。
The invention discloses a method for testing the net energy of a power battery of an electric vehicle. It charges the battery pack at the discharge cut-off voltage to the charge cut-off voltage with a rated current, records the charged energy, and then discharges the battery pack with a rated current to a preset value. Set the SOC, record the energy released for the first time, and then conduct a cycle test on the electric vehicle. After the test is completed, discharge the battery pack at the rated current to the discharge cut-off voltage, and record the energy released for the second time; The charge and discharge efficiency obtains the energy change of the battery in the cycle test of the working condition, corrects the energy change of the battery in the cycle test of the working condition according to the battery charge and discharge energy efficiency model, and obtains the actual stored electric energy of the battery during the cycle of the working condition, that is, the battery of net energy. On the one hand, the method considers the influence of charging and discharging efficiency on the net energy of the battery, and the test accuracy is high;
Description
Technical field
The present invention relates to electric automobile energy consumption testing technical field, particularly a kind of electric automobile power battery net energy method of testing.
Background technology
Electrokinetic cell is an energy-storage travelling wave tube the most frequently used in all kinds of electric automobiles, and its power performance directly has influence on the operating cost and the serviceable life of electric automobile.The finite energy that therefore must make full use of the electric battery storage is with the operating cost that reduces electric automobile and increase the service life.The research of aspects such as at present energy-optimised to the Vehicular dynamic battery group, EMS is more, but for less with the research that the closely-related battery net energy of discharging changes with the electric automobile energy consumption.And research electric automobile power battery net energy has significant meaning: 1) for heavy mixed power electric car car load energy consumption and emission test technical support is provided; 2) net energy of cells known can be tried to achieve the energy efficiency of battery in the car load test process, and then can analyze the battery generation of heat at work, is convenient to battery thermal management, optimizes integrated vehicle control tactics.
Conventional battery net energy computing method are directly to calculate through voltage, electric current and time integral, obtain the battery net energy.This method is not owing to consider the influence of efficiency for charge-discharge, and electric current and voltage accurately obtain the restriction that receives surveying instrument, the changing value that therefore obtains the battery net energy exactly is a difficulty very.
Therefore, be necessary to provide a kind of improved electric automobile power battery net energy method of testing to overcome the defective of prior art.
Summary of the invention
The purpose of this invention is to provide a kind of electric automobile power battery net energy method of testing, can accurately obtain the changing value of battery net energy.
To achieve these goals, the invention provides a kind of electric automobile power battery net energy method of testing, comprise the steps:
(1) confirm that state-of-charge is interval, calculate the battery net energy in this state-of-charge interval according to the rated capacity and the battery open circuit voltage of electric battery with the quantitative relationship of state-of-charge, computing formula is:
Wherein, Δ Q
nBe net energy, C
nBe rated capacity, SOC (0) is that state-of-charge is interval to SOC (t), U
OCVBe battery open circuit voltage, SOC is a state-of-charge;
(2) battery is carried out the multiple discharge experiment, set up the battery discharging energy efficiency Model of discharge current and discharge energy relationship between efficiency;
(3) electric automobile is put between test carriage, the electric battery that will be in discharge cut-off voltage is charged to the charging cut-off voltage with rated current, the energy E that the record charging consumes
1, discharge into discharge cut-off voltage with rated current again, the energy E that record is emitted
2, according to formula
The average efficiency for charge-discharge of counting cell group
(4) electric automobile is put between test carriage, the electric battery that will be in discharge cut-off voltage with the rated current constant-current charge to the cut-off voltage that charges, again with the rated current constant-current discharge to preset SOC, the energy E that record is emitted for the first time
Out1, again electric automobile being carried out the operating mode cyclic test on the chassis dynamometer revolving drum test table, the average current of record operating mode cyclic test after the operating mode cyclic test is accomplished, to discharge cut-off voltage, writes down the energy E of emitting for the second time with the rated current constant-current discharge
Out2
(5) according to the average efficiency for charge-discharge of battery
The energy E that charging consumes
1, the energy E of emitting for the first time
Out1With the energy E of emitting for the second time
Out2The energy content of battery variation delta E of design condition circulation experiment
0, computing formula is:
According to the average current of the operating mode cyclic test of rated current and record, utilize the battery discharging energy efficiency Model to calculate the preset discharge energy efficiency eta under the system that discharges and recharges respectively
OutWith the discharge energy efficiency eta in the operating mode cyclic test
Dis0, according to formula Δ E
t=(Δ E
0/ η
Out) η
Dis0The battery net energy Δ E of design condition circulation experiment
t
In one embodiment of the invention, definite step of the rated capacity of electric battery is in the said step (1):
With electric battery with the rated current constant-current discharge to discharge cut-off voltage, to the cut-off voltage that charges, this moment, the electric weight that charges into was the rated capacity of electric battery with the rated current constant-current charge.
In another embodiment of the present invention, battery open circuit voltage with definite step of the quantitative relationship of state-of-charge is in the said step (1):
With electric battery with the rated current constant-current discharge to discharge cut-off voltage, the test electric automobile is when being pure electric automobile, rated current is C/3, when the test electric automobile was mixed power electric car, rated current was 1C;
Again electric battery is stopped the charging curve that the record total voltage changes with state-of-charge after with 0.04C electric current constant-current charge 25h;
Again with electric battery with 0.04C electric current constant-current discharge 25h after or stop the discharge curve that the record total voltage changes with state-of-charge to cut-off voltage;
The utilization linear interpolation method obtains the open circuit voltage variations curve that the monomer average open-circuit voltage changes with state-of-charge with charging curve and discharge curve stack,
Utilize the relational expression of battery open circuit voltage with state-of-charge
And the unknown parameter k in the above-mentioned open circuit voltage variations curve acquisition relational expression
1, k
2, k
3, k
4, k
5, k
6, k
7, k
8, k
9, k
10, obtain the quantitative relationship of battery open circuit voltage with state-of-charge, wherein y is an open-circuit voltage in the relational expression, x is a state-of-charge.
In an embodiment more of the present invention, said step (2) is specially:
Battery is discharged to the termination SOC of setting with different constant currents from the initial SOC that sets, to each constant current, the extraneous energy Q of battery output behind the record discharge off
OutAnd battery net energy Δ Q
n, according to formula η
Dis=Q
Out/ Δ Q
nCalculate the corresponding discharge energy efficiency eta of each constant current
Dis, all constant currents and corresponding discharge energy efficient are carried out curve fitting, thereby set up the battery discharging energy efficiency Model.
Compared with prior art, electric automobile power battery net energy method of testing of the present invention has been considered the influence of efficiency for charge-discharge to the battery net energy, and battery net energy accuracy of test is high.
In addition; This method of testing need not the voltage, the current value that adopt expensive surveying instrument to obtain battery; Only need measure the energy that electric automobile fills into and emits before and after test; Thereby obtain the energy changing amount of battery in the operating mode circulation, and then obtain the net energy of battery through correction, method of testing realizes easily.
Through following description and combine accompanying drawing, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is an electric automobile power battery net energy method of testing process flow diagram of the present invention.
Fig. 2 be in the electric automobile power battery net energy method of testing shown in Figure 1 LiFePO4 batteries monomer average open-circuit voltage with the SOC change curve.
Fig. 3 has showed the LiFePO4 batteries charging energy efficiency model in the electric automobile power battery net energy method of testing shown in Figure 1, wherein the battery charge energy efficiency that obtains for actual measurement of black side's point.
Fig. 4 has showed the LiFePO4 battery power discharge energy efficiency model in the electric automobile power battery net energy method of testing shown in Figure 1, wherein the battery discharging energy efficient that obtains for actual measurement of black side's point.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
Principle below in conjunction with accompanying drawing and instantiation detailed description electric automobile power battery net energy method of testing of the present invention.The electric battery that the present embodiment electric automobile adopts is the LiFePO4 type lithium-ion-power cell that domestic certain company produces.
As shown in Figure 1, said electric automobile power battery net energy method of testing comprises the steps:
Step S1; According to national standard, (rated current of dissimilar batteries is confirmed by corresponding national battery performance test standard and electric automobile type, when the test electric automobile is pure electric automobile (EV) with rated current with electric battery; The LiFePO4 type lithium-ion-power cell rated current that this paper selects for use is 0.33C; Be C/3, when test electric automobile when being mixed power electric car (HEV), the LiFePO4 type lithium-ion-power cell rated current that this paper selects for use is 1C) constant-current discharge is to discharge cut-off voltage; Leave standstill 1h (after the completion of national Specification battery discharge; Leave standstill 1h and treat to carry out again after battery performance recovers ensuing charging experiment) after, with rated current constant-current charge to the cut-off voltage that charges (being about to electric battery is full of), the electric weight that charge into this moment is the rated capacity C of electric battery
n
Step S2, according to national standard, (confirmed with power accumulator performance test standard by 2008 annual EV, HEV: when the test electric automobile was pure electric automobile (EV), rated current was C/3 with rated current with electric battery; When test electric automobile when being mixed power electric car (HEV), rated current is 1C) constant-current discharge is to discharge cut-off voltage, leaves standstill 1h (after the national Specification battery discharge accomplishes; Leave standstill 1h and treat to carry out again after battery performance recovers ensuing charging experiment) after, with 0.04C (C/25 confirms that by document and experiment test the low range electric current is C/25) constant-current charge 25h (with 0.04C constant-current charge 25h; Battery capacity (C/25) * 25=C, promptly battery is full of electricity, and the battery cell average voltage can not arrive charging cut-off voltage 3.6V)) after stop; The record total voltage is with the battery charge curve that SOC (state-of-charge) changes, and leaves standstill 5h (because during with C/25 electric current constant-current charge, the duration of charging reaches 25h; And before guaranteeing to carry out follow-up discharge test, battery performance recovers and is in steady state (SS) fully, makes the measured value of after discharge experiment enough accurate; Therefore time of repose is longer here, is 5h) after, to stop (with 0.04C constant-current discharge 25h behind the 0.04C electric current constant-current discharge 25h or to discharge cut-off voltage; In theory that the battery tele-release is intact, consider that battery is formed battery module after, the monomer inconsistency strengthens; Some monomer voltage has reached discharge cut-off voltage in the time of might causing battery discharge to be less than 25h; Cause potential safety hazard for avoiding battery to cross putting, also should stop discharge this moment), the battery discharge curve that the record total voltage changes with SOC; The utilization linear interpolation method can obtain monomer average open-circuit voltage U with charging curve and discharge curve stack
OCVThe open circuit voltage variations curve that changes with SOC is (according to document (periodical JOURNAL OF POWER SOURCES; Article is called Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs Part2.Modeling and identification, author Gregory L.Plett) and experiment test can know, discharge and recharge for a long time with the low range electric current; The gained charging and discharging curve is superposeed; Can obtain the relation curve that open-circuit voltage (OCV) changes with state-of-charge (SOC), the OCV-SOC relation curve error that this curve and actual measurement obtain is very little, can correctly reflect the open-circuit voltage of battery under certain state-of-charge); It is as shown in Figure 2 that (voltage among Fig. 2 is that total voltage is divided by the monomer number; Be the monomer average open-circuit voltage, round dot is the cell open-circuit voltage values that actual measurement obtains, measuring method be battery with electric weight be charged to certain SOC after having put; (open-circuit voltage refers to battery under off working state to leave standstill 3h; Be that battery does not have under the condition of external any load, when the circuit no current flows through, directly measure the magnitude of voltage between gained battery two binding posts with ammeter.Battery must be in steady state (SS) when therefore carrying out the open-circuit voltage measurement, so when being charged to certain SOC, must leave standstill the regular hour; Treat that battery performance is stable, the present time of repose that adopts is generally 2-4h, and the time of repose that we choose when experimentizing is 3h; This moment, the inside battery chemical reaction tended to balance; Performance is recovered basically fully, leaves standstill the longer time again, and cell voltage, temperature do not have to change basically) back survey total voltage; Then divided by the monomer number), can obtain the open-circuit voltage U of corresponding state-of-charge (SOC) point according to this open circuit voltage variations curve
OCVThe relational expression of utilizing the same state-of-charge of LiFePO4 battery open circuit voltage (SOC) is (by document (periodical JOURNAL OF POWER SOURCES; Article is called Solid-state diffusion limitations on pulse operation of a lithium ion cell for hybrid electric vehicles; Author Kandler Smith, Chao-Yang Wang) obtain, this relational expression can accurately reflect the open-circuit voltage of battery under certain state-of-charge; This function curve is compared with above-mentioned measured curve; Error is very little, and the mean square deviation of fitting function curve is less than 0.002, and related coefficient is greater than 0.999) but and above-mentioned open circuit voltage variations curve iteration try to achieve the unknown parameter k in (1) formula
1, k
2, k
3, k
4, k
5, k
6, k
7, k
8, k
9, k
10, obtain the quantitative relationship of LiFePO4 battery open circuit voltage with SOC, wherein the LiFePO4 battery open circuit voltage is following with the relational expression of SOC:
(1) in the formula, y is open-circuit voltage U
OCV, x is SOC (state-of-charge);
Step S3 confirms state-of-charge (SOC) interval, calculates the interval interior battery net energy of this state-of-charge (SOC) according to the LiFePO4 battery open circuit voltage with the quantitative relationship of state-of-charge:
Wherein, Δ Q
nBe battery net energy, C
nBe the battery rated capacity, SOC (0) is that state-of-charge is interval to SOC (t), U
OCVBe battery open circuit voltage, SOC is a state-of-charge;
Step S4 is according to national Specification, under 20 ℃ ± 5 ℃ environmental baselines; With different charging currents (0.1C, 0.33C, 0.5C, 1C, the 2C) experiment of charging; Charge to certain SOC, to each charging current, the energy Q of extraneous input battery after the record charging is accomplished
In, and calculate charging according to the formula among the step S3 and cause SOC to change pairing battery net energy Δ Q
n, by rechargeable energy efficiency calculation formula η
Ch=Δ Q
n/ Q
InCalculate the corresponding rechargeable energy efficiency eta of each charging current
ChExperimental data is carried out curve fitting; Set up battery charge energy efficiency model (as shown in Figure 3, the battery charge energy efficiency that obtains for actual measurement of black point wherein, solid line is the matched curve of rechargeable energy efficient second order; Be the line of a plurality of black points, the quadratic function equality is the rechargeable energy efficiency Model of being set up); According to national Specification; Under 20 ℃ ± 5 ℃ environmental baselines, (0.1C, 0.33C, 0.5C, 1C, 2C, 3C) carries out discharge test with different discharge currents, is discharged to certain SOC; To each discharge current, the extraneous energy Q of battery output after the record discharge is accomplished
Out, and calculating discharge according to the formula among the step S3, to cause SOC to change pairing battery net energy be Δ Q
n, by discharge energy efficiency calculation formula η
Dis=Q
Out/ Δ Q
nCalculate the corresponding discharge energy efficiency eta of each discharge current
DisExperimental data is carried out curve fitting; Set up the battery discharging energy efficiency Model (as shown in Figure 4, the battery discharging energy efficient that obtains for actual measurement of black side's point wherein, solid line is the matched curve of discharge energy efficient second order; Be the line of a plurality of black points, the quadratic function equality is the battery discharging energy efficient mathematical model of being set up);
Step S5 puts into electric automobile between test carriage, with the rated current I of electric battery with national Specification
0(pure electric automobile rated current I
0Be C/3, mixed power electric car rated current I
0Be 1C) constant-current discharge to discharge cut-off voltage (being about to the electric battery dump energy gives out light), leave standstill 1h (after the completion of national Specification battery discharge, leave standstill 1h and treat to carry out after battery performance recovers ensuing charging experiment again), with rated current I
0Constant-current charge is to charging cut-off voltage, the energy value E that record charges and consumed
1, leave standstill 1h after, with rated current I
0Constant-current discharge writes down the energy value E that from battery, emits to discharge cut-off voltage
2, then the average efficiency for charge-discharge of electric battery is:
Step S6 puts into electric automobile between test carriage, with electric battery with rated current I
0(pure electric automobile rated current I
0Be C/3, mixed power electric car rated current I
0Be 1C) constant-current discharge to discharge cut-off voltage (being about to the electric battery dump energy gives out light), leave standstill 1h, with rated current I
0(pure electric automobile is 0.33C, and mixed power electric car is 1C) constant-current charge writes down the energy value that charging consumes to the cut-off voltage that charges
Be the E among the step S5
1, leave standstill 1h after, with rated current I
0(this value is generally 80% to constant-current discharge to preset SOC value, and used for electric vehicle power accumulator state-of-charge scope commonly used is 20%-80%, and electric automobile is in operating mode circulation driving process; The stored electric weight of battery is used for the steam supply car and goes; Battery is emitted electric weight, and the SOC value reduces, so the preset SOC value that operating mode circulates before going generally is made as 80%-90%; Low excessively with battery electric quantity after avoiding the operating mode circulation to go), the energy value E that record is emitted
Out1, leave standstill 1h after, on the chassis dynamometer revolving drum test table, carry out the operating mode cyclic test, the average current I of record operating mode cyclic test with Chinese typical urban public transport circulation
Av(average current I
AvBy the operating mode circulation decision of being selected for use, under the different working conditions circulation, the electric current of battery changes different, and the electric current in the whole working condition cyclic process is carried out sum-average arithmetic, can obtain the average current I under the operating mode cyclic test
Av), after the operating mode cyclic test is accomplished, leave standstill 1h after, with rated current I
0Constant-current discharge writes down the energy value E that emits to discharge cut-off voltage
Out2
Step S7, the average efficiency for charge-discharge of battery that obtains by step S5
The energy that obtains the actual acquisition of battery does
The energy content of battery variation delta E of operating mode circulation experiment then
0For:
Step S8 is according to the rated current I of step S6
0Average current I with the operating mode cyclic test of writing down
Av, utilize the battery discharging energy efficiency Model of step S4 to calculate preset system (the rated current I that discharges and recharges respectively
0) under the discharge energy efficiency eta
OutWith the discharge energy efficiency eta in the operating mode cyclic test
Dis0, according to preset system (the rated current I that discharges and recharges that calculates
0) under the discharge energy efficiency eta
OutWith the discharge energy efficiency eta in the operating mode cyclic test
Dis0, and the energy content of battery variation delta E of the operating mode circulation experiment of trying to achieve among the step S7
0, the battery net energy variable quantity of design condition circulation experiment, computing formula is:
ΔE
t＝(ΔE
0/η
put)·η
dis0 (2)
Battery net energy variation delta E
tBe the energy of battery physical holding of the stock in the operating mode cyclic test process, i.e. the net energy of battery in the operating mode cyclic process.
The principle of following description of step S8.Evidence is when the average current of pulse charge is I
Av, ch, the energy efficiency of pulse charge with identical average current I
Av, chThe energy efficiency of constant-current charge is basic identical; When the average current of pulsed discharge is I
Av, dis, the energy efficiency of pulsed discharge with identical average current I
Av, disThe energy efficiency of constant-current discharge is basic identical.The charge and discharge electric current of battery constantly changes in the operating mode cyclic test, so the current value of the constant current charge-discharge system of the average current of battery charge and discharge and setting (is rated current I in the operating mode cyclic test
0) when equating, the energy efficiency of pulse charge and discharge equates that with the energy efficiency of constant current charge and discharge the energy changing amount of operating mode cyclic test is the actual energy variable quantity of battery, is the net energy of battery in the operating mode cyclic test process.
But, owing to the average current and the preset rated current I that discharges and recharges system of battery charge and discharge in the actual condition circulation
0And unequal, therefore need to proofread and correct the energy content of battery variation delta E of design condition circulation experiment
0The time, E
2, E
Out1, E
Out2All be at rated current I
0Obtain down, calculate by the discharge energy efficiency Model and can know that the discharge energy efficient under this electric current is η
OutThereby, can know E
2, E
Out1, E
Out2Actual value should be E
2/ η
Out, E
Out1/ η
Out, E
Out2/ η
OutAverage current under the known operating mode cyclic test is I
Av, can know that by the calculating of discharge energy efficiency Model the discharge energy efficient under this electric current is η
Dis0, the emitting energy accordingly and should be respectively (E of this moment record
2/ η
Out) η
Dis0, (E
Out1/ η
Out) η
Dis0, (E
Out2/ η
Out) η
Ids0Thereby the net energy variable quantity that can know battery in the operating mode circulation experiment process is: Δ E
t=(E
2/ η
Out) η
Dis0-(E
Out1/ η
Out) η
Dis0-(E
Out2/ η
Out) η
Dis0, i.e. Δ E
t=η
Dis0(E
2-E
Out1-E
Out2)/η
Out=(Δ E
0/ η
Out) η
Dis0So the energy content of battery is proofreaied and correct efficient:
η wherein
Dis0Be the discharge energy efficient under the state of cyclic operation, η
OutBe preset discharge system (rated current I
0) under discharge energy efficient, proofread and correct efficiency eta according to the energy content of battery and obtain Δ E
t==Δ E
0η.
By on can know that electric automobile power battery net energy method of testing of the present invention is through the energy E of instrument record input battery
InEnergy E with battery output
Out1, E
Out2(step S6) is by the average efficiency for charge-discharge of battery
Obtain the energy changing amount Δ E of battery in the operating mode circulation
0(step S5 and step S7), energy changing amount Δ E
0Be the poor of the input energy content of battery and battery output energy; According to the energy changing amount Δ E of energy content of battery efficiency Model to the operating mode cyclic test
0Proofread and correct, thereby draw the net energy variation delta E of battery before and after the operating mode loop test
t(step S8) is the battery net energy in the operating mode cyclic test process.
Need to prove: 1) step S5 and S6 all need on the chassis dynamometer revolving drum test table, to carry out; When 2) carrying out battery net energy engine bench test, the residing external environment condition of step S4, S5 and S6 (like environment temperature etc.) should be identical; 3) since electric automobile in operating mode circulation driving process; The electrokinetic cell most of the time is in discharge condition, and therefore in the process of carrying out follow-up energy correction, what mainly consider is the influence of discharge energy efficient; And ignored the influence of rechargeable energy efficient; Therefore do not use the rechargeable energy efficiency Model, evidence, consider simultaneously rechargeable energy efficient influence and discharge energy efficient influence and only consider that the effect correction effect of discharge energy efficient is about the same.
The advantage of this electric automobile power battery net energy method of testing is:
1) the battery charge and discharge energy efficiency model of setting up through step S4; Make and considered that in the process of step S8 counting cell net energy the charge and discharge electric current to the influence of energy efficiency and carried out corresponding correction, has improved the accuracy of battery net energy test.
2) the operating mode circulating energy variable quantity that records through step S5 and S6 has been considered the influence of charge and discharge efficient, and then makes that the operating mode circulating energy variable quantity of trying to achieve is more accurate.And what test was concerned about is the energy of input battery and the energy of battery output; Therefore the test request to operating mode circulation dynamic process amount reduces; Need not to adopt expensive high precision measurement instrument, reduced testing cost and difficulty of test, thereby have very strong operability and practicality.
Invention has been described more than to combine most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (4)
1. an electric automobile power battery net energy method of testing comprises the steps:
(1) confirm that state-of-charge is interval, calculate the battery net energy in this state-of-charge interval according to the rated capacity and the battery open circuit voltage of electric battery with the quantitative relationship of state-of-charge, computing formula is:
Wherein, Δ Q
nBe net energy, C
nBe rated capacity, SOC (0) is that state-of-charge is interval to SOC (t), U
OCVBe battery open circuit voltage, SOC is a state-of-charge;
(2) battery is carried out the multiple discharge experiment, set up the battery discharging energy efficiency Model of discharge current and discharge energy relationship between efficiency;
The electric battery that (3) will be in discharge cut-off voltage is charged to the charging cut-off voltage with rated current, the energy E that the record charging consumes
1, discharge into discharge cut-off voltage with rated current again, the energy E that record is emitted
2, according to formula
The average efficiency for charge-discharge of counting cell group
The electric battery that (4) will be in discharge cut-off voltage with the rated current constant-current charge to the cut-off voltage that charges, again with the rated current constant-current discharge to preset SOC, the energy E that record is emitted for the first time
Out1, again electric automobile being carried out the operating mode cyclic test on the chassis dynamometer revolving drum test table, the average current of record operating mode cyclic test after the operating mode cyclic test is accomplished, to discharge cut-off voltage, writes down the energy E of emitting for the second time with the rated current constant-current discharge
Out2
(5) according to the average efficiency for charge-discharge of electric battery
The energy E that charging consumes
1, the energy E of emitting for the first time
Out1With the energy E of emitting for the second time
Out2The energy content of battery variation delta E of design condition circulation experiment
0, computing formula is:
According to the average current of the operating mode cyclic test of rated current and record, utilize said battery discharging energy efficiency Model to calculate the preset discharge energy efficiency eta under the system that discharges and recharges respectively
OutWith the discharge energy efficiency eta in the operating mode cyclic test
Dis0, according to formula Δ E
t=(Δ E
0/ η
Out) η
Dis0The battery net energy Δ E of design condition circulation experiment
t
2. electric automobile power battery net energy method of testing as claimed in claim 1 is characterized in that, definite step of the rated capacity of electric battery is in the said step (1):
With electric battery with the rated current constant-current discharge to discharge cut-off voltage, to the cut-off voltage that charges, this moment, the electric weight that charges into was the rated capacity of electric battery with the rated current constant-current charge.
3. electric automobile power battery net energy method of testing as claimed in claim 1 is characterized in that, battery open circuit voltage with definite step of the quantitative relationship of state-of-charge is in the said step (1):
With electric battery with the rated current constant-current discharge to discharge cut-off voltage, the test electric automobile is when being pure electric automobile, rated current is C/3, when the test electric automobile was mixed power electric car, rated current was 1C;
Again electric battery is stopped the charging curve that the record total voltage changes with state-of-charge after with 0.04C electric current constant-current charge 25h;
Again with electric battery with 0.04C electric current constant-current discharge 25h after or stop the discharge curve that the record total voltage changes with state-of-charge to cut-off voltage;
The utilization linear interpolation method obtains the open circuit voltage variations curve that the monomer average open-circuit voltage changes with state-of-charge with charging curve and discharge curve stack,
Utilize the relational expression of battery open circuit voltage with state-of-charge
And the unknown parameter k in the above-mentioned open circuit voltage variations curve acquisition relational expression
1, k
2, k
3, k
4, k
5, k
6, k
7, k
8, k
9, k
10, obtain the quantitative relationship of battery open circuit voltage with state-of-charge, wherein y is an open-circuit voltage in the relational expression, x is a state-of-charge.
4. electric automobile power battery net energy method of testing as claimed in claim 1 is characterized in that, said step (2) is specially:
Battery is discharged to the termination SOC of setting with different constant currents from the initial SOC that sets, to each constant current, the extraneous energy Q of battery output behind the record discharge off
OutAnd battery net energy Δ Q
n, according to formula η
Dis=Q
Out/ Δ Q
nCalculate the corresponding discharge energy efficiency eta of each constant current
Dis, all constant currents and corresponding discharge energy efficient are carried out curve fitting, thereby set up the battery discharging energy efficiency Model.
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003224901A (en) * | 2001-10-30 | 2003-08-08 | Yamaha Motor Co Ltd | Method and apparatus for managing battery capacity, capacity managing apparatus of battery for vehicle power |
| CN1437031A (en) * | 2002-02-08 | 2003-08-20 | 上海华谊（集团）公司 | Battery capacity measuring method |
| CN101320079A (en) * | 2008-06-25 | 2008-12-10 | 哈尔滨工业大学 | How to calculate battery state of charge |
| KR100970841B1 (en) * | 2008-08-08 | 2010-07-16 | 주식회사 엘지화학 | Battery capacity deterioration estimation apparatus and method using battery voltage behavior |
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