CN107045103A - Electric automobile power battery endurance testing device and method - Google Patents
Electric automobile power battery endurance testing device and method Download PDFInfo
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- CN107045103A CN107045103A CN201611076039.7A CN201611076039A CN107045103A CN 107045103 A CN107045103 A CN 107045103A CN 201611076039 A CN201611076039 A CN 201611076039A CN 107045103 A CN107045103 A CN 107045103A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The invention discloses a kind of electric automobile power battery endurance testing device and method.It is the vibration to being tested when electric automobile power battery applies simulated roadway traveling using shake table, and the humiture using thermostatic constant wet chamber's simulation throughout the year, and then discharge and recharge is carried out to tested electric automobile power battery using charging/discharging apparatus, simulated roadway travels electric current and gathers related data, record and derive the battery information, it is determined that the life-span of the tested electric automobile power battery.The present invention has considered the composite factor such as the change of four seasons humiture, discharge and recharge operating mode and depth of discharge and vibration operating mode, enumerate the various running statuses of electric automobile power battery, simultaneously, using material in limit range the constant characteristic of failure mechanism, it has been fitted aging extrapolation formula, the corresponding life-span is derived, thus is more accurate life appraisal test model.It has intercepted part stage in life-span degenerative process, thus substantially reduces test period.
Description
Technical field
The present invention relates to electric automobile power battery testing field, more particularly to a kind of electric automobile power battery life-span surveys
Try apparatus and method.
Background technology
Electrokinetic cell is as the core component of electric automobile, and the test and assessment in its life-span are for researching and developing and using all
It is very necessary and important.If learning the service life of electrokinetic cell, the out-of-service time is predicted, research and development department can set accordingly
Meter or modification product, manufacturing enterprise can hold product quality and usage cycles, so as to be that cost calculation and fault restoration are provided
Foundation.And if carrying out life test using actual road test, although relatively actual condition, but the time cycle is very long,
Cost is high, the need for not too much adapting to current engineering development.Therefore, the electric automobile power battery bag life-span will pre-estimate its longevity
Life model carries out accelerated test acquisition again.
From currently to the research of electrokinetic cell accelerated life model from the point of view of, be primarily present problems with.
Problem one, only considered the acceleration model of some or a small number of stress, but not consider phase interaction between multiple stress
With the influence factor of generation, it is difficult to the actual complex operating mode of true representation electric automobile power battery.
For example, only considering the linear fit model of charging and discharging currents operating mode：
Y=kx+b
Wherein, k and b is tests constant to be measured, and x is cycle-index, and y is that the operating mode in capacity to be measured, the model only considers
Charging and discharging currents.
For another example, it is considered to the life model of temperature and electric stress：
L=exp [A (E)+B (E)/T]
Wherein
A (E)=A1+A2E
B (E)=B1+B2E
Wherein, T is absolute temperature, and E is electric stress, A1、A2、B1、B2For constant, obtained by test data, because when electricity
When stress is under some level, the life-span of electrokinetic cell and the correlation of this electric stress are smaller, therefore this model can not
The relation reflected comprehensively between the life-span of electrokinetic cell and each stress.
Problem two, it is considered to interactional many stress acceleration models, its solving complexity, it is assumed that too many, the authenticity of prediction
Need further checking.
For example, it is contemplated that the PH models of a variety of stress：
Wherein, λ0(t) it is the basic failure function with time correlation,To be only related to various stress and the time
Unrelated positive function, whereinFor row vector, For column vector,M be and when
Between independent stress variable number.There it can be seen that solving the model becomes considerably complicated, and parameter is more.
The content of the invention
It is an object of the invention to provide a kind of electric automobile power battery endurance testing device and method, consider at the same time many
In the case of the factor of kind, the life-span of electric automobile power battery is simply, and quickly measured.
The invention provides a kind of electric automobile power battery endurance testing device, including：
Shake table, tested electric automobile power battery is fixedly installed in the shake table, and the shake table can be according to
Setpoint frequency, acceleration and displacement are vibrated；
Thermostatic constant wet chamber, the shake table is collectively disposed at described together with the electric automobile power battery being fixedly mounted thereon
In constant temperature and humidity room, the thermostatic constant wet chamber can provide constant-temperature constant-humidity environment according to design temperature and humidity；
Charging/discharging apparatus, the charging/discharging apparatus is located at outside the constant temperature and humidity room, and is electrically connected to tested described
Electric automobile power battery, to carry out discharge and recharge to the electric automobile power battery and record the electric automobile power battery
Voltage, electric current and temperature；And,
Computer is controlled, the control computer is located at outside the constant temperature and humidity room and is electrically connected to the shake table and discharge and recharge
Equipment, to control the shake table to be vibrated according to set frequency, acceleration and displacement, controls the charging/discharging apparatus
Discharge and recharge and battery information collection are carried out to the electric automobile power battery, and it is tested according to the battery information measuring and calculating gathered
The expected life mileage of the electric automobile power battery (2) of examination.
Further, the charging/discharging apparatus is connected to the electric automobile power battery by leader cable, with to the electricity
Electrical automobile electrokinetic cell carries out discharge and recharge；Also,
The charging/discharging apparatus is connected to the electric automobile by voltage acquisition line, current acquisition line and temperature acquisition line
Electrokinetic cell, to gather the voltage, electric current and temperature information of the electric automobile power battery.
Further, the battery information includes voltage, electric current and the temperature information of the electric automobile power battery.
Further, the control computer is connected to the charging/discharging apparatus by data wire, to be obtained by the data wire
Take the battery information, and the life-span for the electric automobile power battery for determining to be tested using the battery information.
Present invention also offers a kind of electric automobile power battery life testing method, the electric automobile power battery longevity
Method of testing is ordered using electric automobile power battery endurance testing device as above described in any one, methods described includes：
First environment condition, second environment condition, the 3rd environmental condition and the 4th environmental condition are set respectively；
Utilize vibration during Research on Shaking Table for Simulating running car；
While the shake table vibrates, to tested electric automobile power battery successively first environment condition,
The first charge and discharge cycles operation is carried out under the conditions of second environment condition, the 3rd environmental condition and the 4th environment, and acquisition first is filled
The first trend formula that the discharge capacity of tested electric automobile power battery in discharge cycles operation is changed over time, with
And the second trend formula that the maximum monomer voltage difference of tested electric automobile power battery is changed over time；
Using the first trend formula and the tested electric automobile power battery of second trend formula iterative calculation according to
The secondary subsequent discharge and recharge carried out under the conditions of first environment condition, second environment condition, the 3rd environmental condition and the 4th environment
The discharge capacity of the tested electric automobile power battery of circulation and the maximum of tested electric automobile power battery are single
Bulk voltage is poor；
When the discharge capacity iterated to calculate out reaches default discharge capacity threshold value, or the maximum list that ought be iterated to calculate out
When bulk voltage difference reaches default voltage difference threshold value, stop iterative calculation；
During by stopping iterative calculation, the cumulative of the time for all circulations undergone is used as tested electric powered motor
The expected life of battery, by the vibrational line correspondence of the shake table in the expected life of tested electric automobile power battery
Vehicle driving mileage as tested electric automobile power battery expected life mileage.
Further, to tested electric automobile power battery successively in first environment condition, second environment condition, the 3rd
The first charge and discharge cycles operation is carried out under the conditions of environmental condition and the 4th environment, and obtains the quilt in the operation of the first charge and discharge cycles
The first trend formula that the discharge capacity of the electric automobile power battery of test is changed over time, and tested electric automobile
The second trend formula that the maximum monomer voltage difference of electrokinetic cell is changed over time, including：
Perform the first charge and discharge cycles LOOP1 processes：
Under the conditions of first environment, following steps a to step c process is performed：
Step a, in the state of the shake table does not shake, the charging/discharging apparatus is opened, with Ic electric currents to tested
The electric automobile power battery charging of examination is to maximum SOC；
Step b, the unlatching shake table so that the shake table is according to the electrokinetic cell vibrational line pair during running car
Tested electric automobile power battery applies vibration, while using the charging/discharging apparatus to the electric automobile power battery
Discharged, when the electricity of electrokinetic cell is discharged, in the state of the shake table does not shake, with Ic electric currents to tested
Electric automobile power battery charging to maximum SOC；
Step c, the b that repeats the above steps electric discharge charging process, and gather the quilt in above-mentioned steps b electric discharge charging process
Voltage, the electric current of the electric automobile power battery of test, are calculated when tested electric automobile power battery is discharged every time
Discharge capacity value Q11iWith the maximum voltage difference Δ U of the cell in tested electric automobile power battery11i, and record
Total time t, wherein, i represents the number of times of electric discharge；
Under the conditions of the first environment, as the discharge capacity Q for calculating acquisition11iWhen there is downward trend, in second environment
Under the conditions of, above-mentioned steps b and step c process is performed, wherein, perform above-mentioned steps b's and step c under the conditions of second environment
Process is identical with performing the above-mentioned steps b and step c duration of process under the conditions of first environment；
Perform under the conditions of the second environment above-mentioned steps b and step c process terminate after, in the 3rd environmental condition
Under, above-mentioned steps b and step c process is performed, wherein, above-mentioned steps b and step c mistake is performed under the 3rd environmental condition
Journey is identical with performing the above-mentioned steps b and step c duration of process under the conditions of first environment；
After execution above-mentioned steps b and step c process terminates under the 3rd environmental condition, in the 4th environmental condition
Under, above-mentioned steps b and step c process are continued executing with, wherein, perform above-mentioned steps b's and step c under the conditions of the 4th environment
Process is identical with performing the above-mentioned steps b and step c duration of process under the conditions of first environment；
First environment condition stage, second environment condition stage, the 3rd environmental condition stage, the 4th environment article are fitted respectively
The approximate formula Q in part stagea1=fa1(t) with Δ Ua1=φa1(t)、Qa2=fa2(t) with Δ Ua2=φAA(t)、Qa3=f13(t)
With Δ Ua3=φa3(t)、Qa4=f14(t) with Δ Ua4=φa4(t), wherein, Qa1For the tested electricity under the conditions of first environment
The value that the discharge capacity of electrical automobile electrokinetic cell is changed over time, Δ Ua1For the tested electric automobile under the conditions of first environment
The value that the maximum monomer voltage difference of electrokinetic cell changes with time t, Qa2For the tested electric automobile under the conditions of second environment
The value that the discharge capacity of electrokinetic cell changes with time t, Δ Ua2For the tested electric powered motor under the conditions of second environment
The value that the maximum monomer voltage difference of battery changes with time t, Qa3For the tested electric powered motor under the 3rd environmental condition
The value that the discharge capacity of battery changes with time t, Δ Ua3For the tested electric automobile power battery under the 3rd environmental condition
Maximum monomer voltage difference with time t change value, Qa4For the tested electric automobile power battery under the conditions of the 4th environment
The value that changes with time t of discharge capacity, Δ Ua4For the tested electric automobile power battery under the conditions of the 4th environment most
The value that polymeric monomer voltage difference changes with time t, t is discharge time；
Terminate the first charge and discharge cycles LOOP1 processes.
Further, tested electric powered motor is iterated to calculate using the first trend formula and second trend formula
It is subsequent that battery is carried out under the conditions of first environment condition, second environment condition, the 3rd environmental condition and the 4th environment successively
The discharge capacity of the tested electric automobile power battery of charge and discharge cycles and tested electric automobile power battery
Maximum monomer voltage is poor, including：
By in the first charge and discharge cycles LOOP1, last complete discharge capacity value Q in the 4th environmental condition stage14n
With maximum monomer voltage difference DELTA U14nValue, be used as the first time in the second charge and discharge cycles LOOP2 first environment condition stage
Discharge capacity value Q211The maximum voltage difference Δ U of cell with first time in tested electric automobile power battery211,
According to above-mentioned first environment condition stage, second environment condition stage, the 3rd environmental condition stage, the 4th environmental condition stage
Approximate formula Qa1=fa1(t) with Δ Ua1=φa1(t)、Qa2=fa2(t) with Δ Ua2=φ12(t)、Qa3=f13(t) with Δ Ua3=
φa3(t)、Qa4=f14(t) with Δ Ua4=φa4(t), by Q211With Δ U211Derive the 4th in the second charge and discharge cycles LOOP2
Last complete discharge capacity Q in environmental condition stage24nWith the poor Δ U of maximum monomer voltage24n；
Repetition uses above-mentioned calculating to obtain successively after the second charge and discharge cycles LOOP2 the 4th in each charge and discharge cycles
Last complete discharge capacity value in environmental condition stage and maximum monomer voltage difference.
Further, the first environment condition is：The thermostatic constant wet chamber is set as that the first mean temperature and first is averaged
Humidity；
The second environment condition is：The thermostatic constant wet chamber is set as the second mean temperature and the second medial humidity；
3rd environmental condition is：The thermostatic constant wet chamber is set as the 3rd mean temperature and the 3rd medial humidity；
4th environmental condition is：The thermostatic constant wet chamber is set as the 4th mean temperature and the 4th medial humidity.
Further, the first environment condition, second environment condition, the 3rd environmental condition and the 4th environmental condition are right respectively
Answer the electric automobile power battery use environment condition in winter, spring, summer and autumn.
From such scheme as can be seen that the electric automobile power battery endurance testing device and method of the present invention consider simultaneously
The many factors, basic capsule such as the vibration during environment temperature and humidity, charging and discharging currents operating mode, depth of discharge, traveling
The complex working condition of electrokinetic cell actual motion has been included, meanwhile, according to this constant convention of material failure mechanism in limit range,
Suitable test period is intercepted, the discharge capacity of electrokinetic cell bag and the relational expression of time is fitted, so that anti-with this relational expression
Multiple iteration, solves high-precision bimetry.The present invention is compared to original method due to considering each of influence electrokinetic cell bag
Operating mode factor is planted, and does not pre-suppose that the model of complexity, is solved finally simply by the method for experiment and piecewise fitting
Model formation, thus (consider a variety of main influence operating modes with precision of prediction height, and lost according to material in limit range
Constant this convention of effect mechanism is assumed), test period it is shorter (interception be experiment portion of time), realize it is simple (without
Build the life model of complexity) the advantages of, it is especially suitable for the rapid evaluation in electric automobile power battery life-span.
Brief description of the drawings
The following drawings only does schematic illustration and explanation to the present invention, not delimit the scope of the invention.
Fig. 1 is the electric automobile power battery endurance testing device schematic diagram of the embodiment of the present invention；
Fig. 2 is the schematic flow sheet of the electric automobile power battery life testing method of the embodiment of the present invention.
Label declaration
11st, shake table
12nd, thermostatic constant wet chamber
13rd, charging/discharging apparatus
14th, computer is controlled
2nd, electric automobile power battery
Embodiment
In order to be more clearly understood to the technical characteristic of invention, purpose and effect, now control brief description of the drawings is of the invention
Embodiment, in the various figures identical label represent identical part.
Herein, " schematic " expression " serving as example, example or explanation ", will should not be described herein as " showing
Any diagram, the embodiment of meaning property " are construed to a kind of preferred or more advantageous technical scheme.
To make only to schematically show part related to the present invention in simplified form, each figure, and it is not represented
It is used as the practical structures of product.In addition, so that simplified form is readily appreciated, there is the portion of identical structure or function in some figures
Part, only symbolically depicts one of those, or has only marked one of those.
Herein, " one " is not offered as the quantity of relevant portion of the present invention being limited to " only this ", and " one
It is individual " do not indicate that the situation of the quantity " more than one " for excluding relevant portion of the present invention.
Herein, " on ", " under ", "front", "rear", "left", "right" etc. are only used for representing relative between relevant portion
Position relationship, and the absolute position of these non-limiting relevant portions.
Herein, " first ", " second " etc. are only used for mutual differentiation, rather than represent significance level and order and
Premise existed each other etc..
Herein, the limitation on the mathematics and/or geometry meaning of " equal ", " identical " etc. and non-critical, is also included
It will be appreciated by those skilled in the art that and manufacture or the error for the permission such as using.Unless otherwise indicated, numerical value model herein
Enclosing not only includes the gamut in two end points, also including being contained in some subranges therein.
As shown in figure 1, the electric automobile power battery endurance testing device of the embodiment of the present invention, including shake table 11, perseverance
Constant temperature and humidity room 12, charging/discharging apparatus 13 and control computer 14.Wherein, tested electric automobile power battery 2 is fixedly installed in
The shake table 11, the shake table 11 can be vibrated according to setpoint frequency, acceleration and displacement.The shake table 11 together with
The electric automobile power battery 2 being fixedly mounted thereon is collectively disposed in the thermostatic constant wet chamber 12, the thermostatic constant wet chamber 12
Constant-temperature constant-humidity environment can be provided according to design temperature and humidity.The charging/discharging apparatus 13 is located at outside the thermostatic constant wet chamber 12,
Also, the charging/discharging apparatus 13 is electrically connected to the tested electric automobile power battery 2, with dynamic to the electric automobile
Power battery 2 carries out discharge and recharge and records voltage, electric current and the temperature of the electric automobile power battery 2.The control computer 14
Outside the thermostatic constant wet chamber 13, also, the control computer 14 is electrically connected to the shake table 11 and charging/discharging apparatus 13,
To control the shake table 11 to be vibrated according to set frequency, acceleration and displacement, and control the charging/discharging apparatus
13 pairs of electric automobile power batteries 2 carry out discharge and recharge and battery information are acquired.Wherein, the battery information bag
Include voltage, electric current and the temperature information of the electric automobile power battery 2.
In the embodiment of the present invention, the charging/discharging apparatus 13 is connected to the electric automobile power battery 2 by leader cable,
To carry out discharge and recharge to the electric automobile power battery 2.In addition, in order to gather the electric automobile power battery 2 voltage,
Electric current and temperature information, the charging/discharging apparatus 13 are also connected to by voltage acquisition line, current acquisition line and temperature acquisition line
The electric automobile power battery 2, to gather voltage, electric current and the temperature information of the electric automobile power battery 2.Fig. 1 is only
As signal, the connection for being not specifically illustrated voltage acquisition line, current acquisition line and temperature acquisition line etc. on various cables is closed
System.
In the embodiment of the present invention, the control computer 14 is connected to the charging/discharging apparatus 13 by data wire, to pass through
The data wire obtains the battery information (voltage, electric current and the temperature information of i.e. described electric automobile power battery 2), and profit
The life-span of the tested electric automobile power battery 2 is determined with the battery information, i.e., according to the battery information gathered
The expected life mileage of the tested electric automobile power battery 2 of measuring and calculating.
In the embodiment of the present invention, on the acquisition in the life-span of the electric automobile power battery 2, described fill is mainly used
13 pairs of the discharge equipment electric automobile power battery 2 carries out the battery information gathered during discharge and recharge to the relation of time, enters
Row correlation formula is fitted, and then is extrapolated to determine the life-span of the electric automobile power battery 2 using the correlation formula.Close
In related evaluation work, calculating completion is carried out using the collected battery information and time by control computer 14.
The electric automobile power battery life testing method of the embodiment of the present invention, using the above-mentioned electric automobile power battery longevity
Test device is ordered, as shown in Fig. 2 this method includes：
First environment condition, second environment condition, the 3rd environmental condition and the 4th environmental condition are set respectively；
Utilize vibration during Research on Shaking Table for Simulating running car；
While the shake table vibrates, to tested electric automobile power battery successively first environment condition,
The first charge and discharge cycles operation is carried out under the conditions of second environment condition, the 3rd environmental condition and the 4th environment, and acquisition first is filled
The first trend formula that the discharge capacity of tested electric automobile power battery in discharge cycles operation is changed over time, with
And the second trend formula that the maximum monomer voltage difference of tested electric automobile power battery is changed over time, wherein, electric discharge
Capacity refers to the electricity of electric discharge release, and unit is Ah (ampere-hour)；
Using the first trend formula and the tested electric automobile power battery of second trend formula iterative calculation according to
The secondary subsequent discharge and recharge carried out under the conditions of first environment condition, second environment condition, the 3rd environmental condition and the 4th environment
The discharge capacity of the tested electric automobile power battery of circulation and the maximum of tested electric automobile power battery are single
Bulk voltage is poor；
When the discharge capacity iterated to calculate out reaches default discharge capacity threshold value, or the maximum list that ought be iterated to calculate out
When bulk voltage difference reaches default voltage difference threshold value, stop iterative calculation；
During by stopping iterative calculation, the cumulative of the time for all circulations undergone is used as tested electric powered motor
The expected life of battery, by the vibrational line correspondence of the shake table in the expected life of tested electric automobile power battery
Vehicle driving mileage as tested electric automobile power battery expected life mileage.
Further, in the above method, to tested electric automobile power battery successively in first environment condition, second
The first charge and discharge cycles operation is carried out under the conditions of environmental condition, the 3rd environmental condition and the 4th environment, and obtains the first discharge and recharge
The first trend formula that the discharge capacity of tested electric automobile power battery in circulate operation is changed over time, and by
The second trend formula that the maximum monomer voltage difference of the electric automobile power battery of test is changed over time, including：
Perform the first charge and discharge cycles LOOP1 processes：
Under the conditions of first environment, following steps a to step c process is performed：
Step a, in the state of the shake table does not shake, the charging/discharging apparatus is opened, with Ic electric currents to tested
The electric automobile power battery charging of examination stands a period of time to maximum SOC, and the time of repose can be according to actual conditions
It is fixed；
Step b, the unlatching shake table so that the shake table is according to the electrokinetic cell vibrational line pair during running car
Tested electric automobile power battery applies vibration, while using the charging/discharging apparatus to the electric automobile power battery
True running current (or NEDC) electric discharge is simulated in progress, and (electrokinetic cell is discharged into when the electricity of electrokinetic cell is discharged
During blanking voltage), in the state of the shake table does not shake, tested electric automobile power battery is filled with Ic electric currents
Electricity stands a period of time to maximum SOC, depending on the time of repose can be according to actual conditions；
Step c, the b that repeats the above steps electric discharge charging process, and gather the quilt in above-mentioned steps b electric discharge charging process
Voltage, the electric current of the electric automobile power battery of test, are calculated when tested electric automobile power battery is discharged every time
Discharge capacity value Q11iWith the maximum voltage difference Δ U of the cell in tested electric automobile power battery11i, and record
Total time t, wherein, i represents the number of times of electric discharge, includes charging, electric discharge and time of repose total time t, i.e. when total time t=charges
Between+time of repose+discharge time；
Under the conditions of the first environment, as the discharge capacity Q for calculating acquisition11iWhen there is downward trend, in second environment
Under the conditions of, above-mentioned steps b and step c process is performed, wherein, perform above-mentioned steps b's and step c under the conditions of second environment
Process is identical with performing the above-mentioned steps b and step c duration of process under the conditions of first environment；
Perform under the conditions of the second environment above-mentioned steps b and step c process terminate after, in the 3rd environmental condition
Under, above-mentioned steps b and step c process is performed, wherein, above-mentioned steps b and step c mistake is performed under the 3rd environmental condition
Journey is identical with performing the above-mentioned steps b and step c duration of process under the conditions of first environment；
After execution above-mentioned steps b and step c process terminates under the 3rd environmental condition, in the 4th environmental condition
Under, above-mentioned steps b and step c process is performed, wherein, above-mentioned steps b and step c mistake is performed under the conditions of the 4th environment
Journey is identical with performing the above-mentioned steps b and step c duration of process under the conditions of first environment；
First environment condition stage, second environment condition stage, the 3rd environmental condition stage, the 4th environment article are fitted respectively
The approximate formula Q in part stagea1=fa1(t) with Δ Ua1=φa1(t)、Qa2=fa2(t) with Δ Ua2=φ12(t)、Qa3=f13(t)
With Δ Ua3=φa3(t)、Qa4=f14(t) with Δ Ua4=φa4(t), wherein, Qa1For the tested electricity under the conditions of first environment
The value that the discharge capacity of electrical automobile electrokinetic cell is changed over time, Δ Ua1For the tested electric automobile under the conditions of first environment
The value that the maximum monomer voltage difference of electrokinetic cell changes with time t, Qa2For the tested electric automobile under the conditions of second environment
The value that the discharge capacity of electrokinetic cell changes with time t, Δ Ua2For the tested electric powered motor under the conditions of second environment
The value that the maximum monomer voltage difference of battery changes with time t, Qa3For the tested electric powered motor under the 3rd environmental condition
The value that the discharge capacity of battery changes with time t, Δ Ua3For the tested electric automobile power battery under the 3rd environmental condition
Maximum monomer voltage difference with time t change value, Qa4For the tested electric automobile power battery under the conditions of the 4th environment
The value that changes with time t of discharge capacity, Δ Ua4For the tested electric automobile power battery under the conditions of the 4th environment most
The value that polymeric monomer voltage difference changes with time t, t is discharge time；Wherein, Qa1=fa1(t)、Qa2=fa2(t)、Qa3=f13(t)、
Qa4=f14(t) it is first trend formula, Δ Ua1=φa1(t)、ΔUa2=φ12(t)、ΔUa3=φa3(t)、ΔUa4=φa4
(t) it is second trend formula；
Terminate the first charge and discharge cycles LOOP1 processes.
In the embodiment of the present invention：Q represents the discharge capacity value of tested electric automobile power battery；QjmiRepresent that jth is filled
The discharge capacity of tested electric automobile power battery when the ith under m environmental conditions in discharge cycles is discharged
Value, for example, Q11iRepresent tested electronic when the ith under the conditions of the first environment in the first charge and discharge cycles is discharged
The discharge capacity value of automobile power cell；Δ U represents that the maximum monomer voltage of tested electric automobile power battery is poor；Δ
UjmiRepresent the tested electric powered motor electricity when ith under the m environmental conditions in jth charge and discharge cycles is discharged
The maximum voltage difference in pond, for example, Δ U11iRepresent that the ith under the conditions of the first environment in the first charge and discharge cycles is discharged
When tested electric automobile power battery maximum voltage difference.
In the above method, tested electric automobile is iterated to calculate using the first trend formula and second trend formula
Electrokinetic cell carried out successively under the conditions of first environment condition, second environment condition, the 3rd environmental condition and the 4th environment with
The discharge capacity of the tested electric automobile power battery of charge and discharge cycles afterwards and tested electric powered motor electricity
The maximum monomer voltage in pond is poor, including：
By in the first charge and discharge cycles LOOP1, last complete discharge capacity value Q in the 4th environmental condition stage14n
With maximum monomer voltage difference DELTA U14nValue, be used as the first time in the second charge and discharge cycles LOOP2 first environment condition stage
Discharge capacity value Q211The maximum voltage difference Δ U of cell with first time in tested electric automobile power battery211
Value (i.e. by Q14nValue assign Q211, by Δ U14nValue assign Δ U211, i.e. Q211=Q14n, △ U211=△ U14n), according to upper
State first environment condition stage, second environment condition stage, the 3rd environmental condition stage, the approximate public affairs in the 4th environmental condition stage
Formula Qa1=fa1(t) with Δ Ua1=φa1(t)、Qa2=fa2(t) with Δ Ua2=φ12(t)、Qa3=f13(t) with Δ Ua3=φa3
(t)、Qa4=f14(t) with Δ Ua4=φa4(t), by Q211With Δ U211Derive the 4th environment in the second charge and discharge cycles LOOP2
Last complete discharge capacity Q in condition stage24nWith the poor Δ U of maximum monomer voltage24n；
Repetition uses above-mentioned iterative calculation to obtain successively after the second charge and discharge cycles LOOP2 in each charge and discharge cycles
Last complete discharge capacity value in the 4th environmental condition stage and maximum monomer voltage difference.
Wherein, Q14nWith Δ U14nIn, n represents the number of times that last time is discharged, and 14n is represented in the first charge and discharge cycles
N-th (i.e. last time) under the conditions of 4th environment is discharged, Q14nRepresent the 4th environmental condition in the first charge and discharge cycles
Under tested electric automobile power battery of the n-th (i.e. last time) when being discharged discharge capacity value, Δ U14nRepresent
Tested electric automobile when n-th (i.e. last time) under the conditions of the 4th environment in first charge and discharge cycles is discharged
The maximum monomer voltage difference of electrokinetic cell.Q211With Δ U211In, 211 represent the first environment condition in the second charge and discharge cycles
Under first time be discharged, Q211Represent the quilt when first time under the conditions of the first environment in the second charge and discharge cycles is discharged
The discharge capacity value of the electric automobile power battery of test, Δ U211Under the conditions of representing the first environment in the second charge and discharge cycles
Tested electric automobile power battery of first time when being discharged maximum monomer voltage difference.
It is to simulate winter throughout the year, spring, summer, autumn to move in circles, and then simulate electric automobile in the embodiment of the present invention
It is most heavy in objective environment during electrokinetic cell use in environment year after year is reciprocal, environmental condition throughout the year
What is wanted is temperature and humidity.And then, in the embodiment of the present invention, the first environment condition simulation is winter conditions state, i.e.,
First environment condition corresponds to the electric automobile power battery use environment condition in winter, and the first environment condition is：The perseverance
Constant temperature and humidity room is set as the first mean temperature and the first medial humidity, wherein, the first mean temperature is the mean temperature in winter, the
One medial humidity is the medial humidity in winter；The second environment condition simulation is spring ambient condition, i.e. second environment bar
Part corresponds to the electric automobile power battery use environment condition in spring, and the second environment condition is：The thermostatic constant wet chamber sets
It is set to the second mean temperature and the second medial humidity, wherein, the second mean temperature is the mean temperature in spring, the second medial humidity
For the medial humidity in spring；The 3rd environmental condition simulation is summer ambient condition, i.e. the 3rd environmental condition correspondence summer
Electric automobile power battery use environment condition, the 3rd environmental condition is：The thermostatic constant wet chamber is set as that the 3rd is flat
Equal temperature and the 3rd medial humidity, wherein, the 3rd mean temperature is the mean temperature of summer, and the 3rd medial humidity is flat for summer
Equal humidity；The 4th environment condition simulation is autumn ambient condition, i.e. the electric automobile in the 4th environmental condition correspondence autumn
Electrokinetic cell use environment condition, the 4th environmental condition is：The thermostatic constant wet chamber is set as the 4th mean temperature and
Four medial humidities, wherein, the 4th mean temperature is the mean temperature in autumn, and the 4th medial humidity is the medial humidity in autumn.
Hereinafter, the present invention will be described again.
First, the connection of device is carried out according to above-mentioned electric automobile power battery endurance testing device embodiment, is connected
Afterwards, electric automobile power battery life test just can be carried out, test process is as follows.
Thermostatic constant wet chamber is opened, the peaceful sam of four mean temperatures in simulation winter, spring, summer, autumn is set successively according to table 1
Degree.
The circular list of table 1
In table 1, environment temperature is set by thermostatic constant wet chamber, and 1,2,3,4 each stages (step) apply temperature below
Time respectively accounts for the 1/4 of total time.Wherein, in the stage 1 (i.e. step 1), T1 environment temperature is the minimum temperature that battery allows
(considering the lowest limit temperature that electric automobile power battery can be used normally), to imitate winter environment temperature；In rank
In 2 (i.e. steps 2) of section, T2 environment temperature is normal temperature, to imitate spring environment temperature；In the stage 3 (i.e. step 3), T3
The maximum temperature that allows for battery of environment temperature (consider the upper limit (UL) temperature that can normally use of electric automobile power battery
Degree), to imitate summer environment temperature；In the stage 4 (i.e. step 4), T4 environment temperature is normal temperature, to imitate autumn ring
Border temperature, wherein, T4=T2.
Similarly, ambient humidity is also set by thermostatic constant wet chamber.Wherein, in the stage 1 (i.e. step 1),It is flat for winter
Equal humidity, to imitate winter environment humidity；In the stage 2 (i.e. step 2),For spring medial humidity, to imitate spring
Ambient humidity；In the stage 3 (i.e. step 3),For summer medial humidity, to imitate summer environment humidity；The stage 4 (i.e.
Step 4) in,For autumn medial humidity, to imitate autumn ambient humidity.
In table 1, on discharge and recharge operating mode, its depth of discharge is 100%DOC/DOD, i.e., charging is each filled with every time, every time
Electric discharge is discharged completely.DOC is Depth Of Charge, and depth of charge, DOD is Depth Of Discharge, and electric discharge is deep
Degree, is filled by NEDC (New European Driving Cycle, new European Driving Cycle) or actual measurement operating mode each time
Electric discharge.
In table 1, on vibration operating mode, vibration of the electric automobile in road actual travel is allowed for, wherein, it is with biography
Automobile vibration road spectrum of uniting is composed the superpositing vibration applied by national standard random vibration road.
Further illustrate, tetra- temperature of T1, T2, T3, T4 are the temperature of electrokinetic cell installation site, no more than power
The resistance to extreme temperature of battery.
Shake table is opened, composes to apply tested electric automobile power battery according to running car road and vibrates.
Charging/discharging apparatus is opened, in the state of the shake table does not shake, with ICElectric current (ICThe perseverance allowed for battery
Current charge electric current) 100%DOC (i.e. maximum SOC) is charged to electrokinetic cell bag, a period of time is stood, then by national regulations
NEDC operating modes or customized Road spectrum, being converted into the charging and discharging currents that charging/discharging apparatus can recognize, (this electric current is small
In the electric discharge limit of tested electric automobile power battery).Run winter mode, i.e., T1 withUnder environmental condition：Shaking
In the case that dynamic platform is by the NEDC operating modes of national regulations or the spectrum vibration of customized Road, tested electric automobile is moved
Power battery composes be converted into charging/discharging apparatus by the NEDC operating modes of above-mentioned national regulations or customized Road to be known
Other charging and discharging currents electric discharge, when the electricity of electrokinetic cell is discharged, then in the state of the shake table does not shake, with IC
Electric current (ICThe constant-current charge electric current allowed for battery) 100%DOC (i.e. maximum SOC), Ran Hou are charged to electrokinetic cell bag
It is electronic to what is be tested again in the case that shake table is by the NEDC operating modes of national regulations or the spectrum vibration of customized Road
Automobile power cell composes be converted into charging/discharging apparatus by the NEDC operating modes of above-mentioned national regulations or customized Road
The charging and discharging currents electric discharge that can be recognized, charge and discharge cycles are constantly carried out with this.
Voltage, the electric current of above-mentioned charge and discharge process are carried out using the electric automobile power battery for controlling computer collection tested
The Dynamic Signal changed over time, calculates the electric discharge that tested electric automobile power battery discharges into the minimum electric discharge limit every time
Capacity Q11iWith the poor Δ U of maximum monomer voltage11i, and record time t11iAnd record total duration t.Wherein, on the time
tjmiWherein tjmiRepresent the time when ith under the m environmental conditions in jth charge and discharge cycles is discharged, such as t11iRepresent the
The time when ith under the conditions of first environment in one charge and discharge cycles is discharged.
In T1 andUnder environmental condition, as discharge capacity Q11iWith t11iWhen there is downward trend in the curve of change, according to
Above method run spring pattern, i.e., T2 withAbove-mentioned charge and discharge process is performed under environmental condition, and records above-mentioned discharge and recharge
The Dynamic Signal that voltage, the electric current of process are changed over time, calculates tested electric automobile power battery and discharges into every time most
The discharge capacity Q of the low discharge limit12iWith the poor Δ U of maximum monomer voltage12i, and record time t12iAnd record total duration
t.Wherein, T2 andDischarge and recharge run time under environmental condition and T1 andDischarge and recharge run time phase under environmental condition
Together.
In T2 andDuring discharge and recharge end of run under environmental condition, summer mode is run according to above method, i.e., in T3
WithAbove-mentioned charge and discharge process is performed under environmental condition, and records the voltage of above-mentioned charge and discharge process, electric current and is changed over time
Dynamic Signal, calculates the discharge capacity Q that tested electric automobile power battery discharges into the minimum electric discharge limit every time13iMost
Polymeric monomer voltage difference delta U13i, and record time t13iAnd record total duration t.Wherein, T3 andFilling under environmental condition
Discharge run time and T1 andDischarge and recharge run time under environmental condition is identical.
In T3 andDuring discharge and recharge end of run under environmental condition, autumn pattern is run according to above method, i.e., in T4
WithAbove-mentioned charge and discharge process is performed under environmental condition, and records the voltage of above-mentioned charge and discharge process, electric current and is changed over time
Dynamic Signal, calculates the discharge capacity Q that tested electric automobile power battery discharges into the minimum electric discharge limit every time14iMost
Polymeric monomer voltage difference delta U14i, and record time t14iAnd record total duration t.Wherein, T4 andFilling under environmental condition
Discharge run time and T1 andDischarge and recharge run time under environmental condition is identical.
After the completion of above-mentioned steps, each of piecewise fitting in stage (i.e. T1 andThe environmental condition stage, T2 andEnvironmental condition
Stage, T3 andThe environmental condition stage, T4 andThe environmental condition stage) approximate formula Qa1=fa1(t) with Δ Ua1=φa1
(t)、Qa2=fa2(t) with Δ Ua2=φ12(t)、Qa3=f13(t) with Δ Ua3=φa3(t)、Qa4=f14(t) with Δ Ua4=φa4
(t), wherein,
In the present embodiment, Qa1For T1 andThe electric discharge of tested electric automobile power battery under environmental condition is held
Measure the value changed over time, Δ Ua1For T1 andThe maximum monomer of tested electric automobile power battery under environmental condition
The value that voltage difference changes with time t, Qa2For T2 andThe electric discharge of tested electric automobile power battery under environmental condition is held
Measure the value changed with time t, Δ Ua2For T2 andThe maximum monomer of tested electric automobile power battery under environmental condition
The value that voltage difference changes with time t, Qa3For T3 andThe electric discharge of tested electric automobile power battery under environmental condition is held
Measure the value changed with time t, Δ Ua3For T3 andThe maximum monomer of tested electric automobile power battery under environmental condition
The value that voltage difference changes with time t, Qa4For T4 andThe electric discharge of tested electric automobile power battery under environmental condition is held
Measure the value changed with time t, Δ Ua4For T4 andThe maximum monomer of tested electric automobile power battery under environmental condition
The value that voltage difference changes with time t, t is discharge time.Wherein, fitting can use digital processing software instrument such as excel
Carry out.
So far, a first complete charge and discharge cycles LOOP1 is just completed.Hereafter, it will be obtained by the way of deriving
The correlation computations of each subsequent charge and discharge cycles.
Derive in the second charge and discharge cycles LOOP2 T4 andLast complete discharge capacity in environmental condition stage
Q24nAnd maximum monomer voltage difference △ U24n：
With T4 in the first charge and discharge cycles LOOP1 andLast complete discharge capacity Q of environmental condition stage14nAnd
Maximum monomer voltage difference △ U14nExtrapolate the second charge and discharge cycles LOOP2 T1 andFirst electric discharge in environmental condition stage is held
Measure Q211With first maximum monomer voltage difference △ U211, i.e. Q211=Q14n, △ U211=△ U14n, the piecewise fitting public affairs more than
Formula Qa1=fa1(t) with Δ Ua1=φa1(t)、Qa2=fa2(t) with Δ Ua2=φ12(t)、Qa3=f13(t) with Δ Ua3=φa3
(t)、Qa4=f14(t) with Δ Ua4=φa4(t) derive in the second charge and discharge cycles LOOP2 T4 andThe environmental condition stage is most
Latter complete discharge capacity Q24nWith maximum monomer voltage difference △ U24n。
According to T4 in above-mentioned the second charge and discharge cycles of derivation LOOP2 andLast of environmental condition stage is complete to put
Capacitance Q24nAnd maximum monomer voltage difference △ U24nComputational methods, the like a to the last charge and discharge cycles LOOPZ
Middle discharge capacity QZmi(except T1 andThe discharge capacity in other environmental condition stages beyond the environmental condition stage) it is close tested
Discharge capacity or maximum monomer voltage difference △ U that the electric automobile power battery of examination allowsZmi(except T1 andEnvironmental condition
The maximum monomer voltage in other environmental condition stages beyond the stage is poor) close to allow maximum voltage difference when, stop derive.Take
QZmi、△UZmiBoth wherein reach that time of regulation permissible value as calculating benchmark at first, all circulations before this benchmark
(i.e. total time in total duration t, including the first charge and discharge cycles LOOP1 is plus subsequently each discharge and recharge for time cumulative
Circulate extrapolation total time) be tested electric automobile power battery expected life time tlife, tlifeWrapped in time
Cumulative, the as life-span mileage S of all NEDC (or the actual measurement operating mode) mileage containedlife。
According to NEDC, then Slife(unit is km to=11.023 × N, and 11.023 be the corresponding row of each NEDC operating modes
Mileage is sailed, N is whole tlifeThe NEDC numbers included in time).
LOOP1、LOOP2……LOOPZIn iterative calculation can with computer programming carry out, with avoid manually compute
It is cumbersome.
The electric automobile power battery endurance testing device and method of the present invention, has considered spring, summer, autumn, the four seasons in winter
The composite factors such as change, discharge and recharge operating mode and the depth of discharge and vibration operating mode of epidemic disaster, enumerate electric automobile and move substantially
The various running statuses of power battery, meanwhile, using material in limit range the constant characteristic of failure mechanism, be fitted outside aging
Apply-official formula, derives the corresponding life-span, thus is more accurate life appraisal test model.It has intercepted life-span degenerative process
Middle part stage, thus substantially reduce test period.The present invention is simple and easy to apply, gears to actual circumstances.
Be used it should be appreciated that the file being cited herein is only for reference, and not comprising it is any its may be with this paper's
Afoul content.
It should be understood that, although this specification is described according to each embodiment, but not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Using specification as an entirety, the technical scheme in each embodiment may also be suitably combined to form people in the art
The understandable other embodiment of member.
Those listed above is a series of to be described in detail only for feasibility embodiment of the invention specifically
It is bright, and and be not used to limit the scope of the invention, all equivalent embodiments made without departing from skill spirit of the present invention or
Change, combination, segmentation or the repetition of such as feature, should be included in the scope of the protection.
Claims (9)
1. a kind of electric automobile power battery endurance testing device, it is characterised in that including：
Shake table (11), tested electric automobile power battery (2) is fixedly installed in the shake table (11)；
Thermostatic constant wet chamber (12), the shake table (11) is common together with the electric automobile power battery (2) being fixedly mounted thereon
It is placed in the thermostatic constant wet chamber (12)；
Charging/discharging apparatus (13), the charging/discharging apparatus (13) is located at the thermostatic constant wet chamber (12) outside, and is electrically connected to tested
The electric automobile power battery (2) of examination, to carry out discharge and recharge to the electric automobile power battery (2) and record the electricity
Voltage, electric current and the temperature of electrical automobile electrokinetic cell；And,
Computer (14) is controlled, the control computer (14) is located at the thermostatic constant wet chamber (12) outside and is electrically connected to the shake table
(11) and charging/discharging apparatus (13), to control the shake table (11) to be shaken according to set frequency, acceleration and displacement
It is dynamic, control the charging/discharging apparatus (13) to carry out discharge and recharge and battery information collection to the electric automobile power battery (2).
2. electric automobile power battery endurance testing device according to claim 1, it is characterised in that：
The charging/discharging apparatus (13) is connected to the electric automobile power battery (2) by leader cable, with to the electronic vapour
Car electrokinetic cell (2) carries out discharge and recharge；Also,
The charging/discharging apparatus (13) is connected to the electric automobile by voltage acquisition line, current acquisition line and temperature acquisition line
Electrokinetic cell (2), to gather the voltage, electric current and temperature information of the electric automobile power battery (2).
3. electric automobile power battery endurance testing device according to claim 1, it is characterised in that：
The battery information includes voltage, electric current and the temperature information of the electric automobile power battery (2).
4. electric automobile power battery endurance testing device according to claim 1, it is characterised in that：
The control computer (14) is connected to the charging/discharging apparatus (13) by data wire, to obtain institute by the data wire
State battery information, and the life-span for the electric automobile power battery (2) for determining to be tested using the battery information.
5. a kind of electric automobile power battery life testing method, the electric automobile power battery life testing method is using power
Profit requires the electric automobile power battery endurance testing device described in 1 to 4 any one, and methods described includes：
First environment condition, second environment condition, the 3rd environmental condition and the 4th environmental condition are set respectively；
Utilize vibration during Research on Shaking Table for Simulating running car；
While the shake table vibrates, to tested electric automobile power battery successively in first environment condition, second
The first charge and discharge cycles operation is carried out under the conditions of environmental condition, the 3rd environmental condition and the 4th environment, and obtains the first discharge and recharge
The first trend formula that the discharge capacity of tested electric automobile power battery in circulate operation is changed over time, and by
The second trend formula that the maximum monomer voltage difference of the electric automobile power battery of test is changed over time；
Existed successively using the first trend formula and the tested electric automobile power battery of second trend formula iterative calculation
The subsequent charge and discharge cycles carried out under the conditions of first environment condition, second environment condition, the 3rd environmental condition and the 4th environment
Tested electric automobile power battery discharge capacity and the maximum monomer electricity of tested electric automobile power battery
Pressure difference；
When the discharge capacity iterated to calculate out reaches default discharge capacity threshold value, or the maximum monomer electricity that ought be iterated to calculate out
When pressure difference reaches default voltage difference threshold value, stop iterative calculation；
During by stopping iterative calculation, the cumulative of the time for all circulations undergone is used as tested electric automobile power battery
Expected life, by the corresponding vapour of vibrational line of the shake table in the expected life of tested electric automobile power battery
Car distance travelled as tested electric automobile power battery expected life mileage.
6. electric automobile power battery life testing method according to claim 5, it is characterised in that to tested electricity
Electrical automobile electrokinetic cell enters under the conditions of first environment condition, second environment condition, the 3rd environmental condition and the 4th environment successively
Row first charge and discharge cycles are operated, and the tested electric automobile power battery obtained in the operation of the first charge and discharge cycles is put
The first trend formula that capacitance is changed over time, and tested electric automobile power battery maximum monomer voltage difference with
The second trend formula of time change, including：
Perform the first charge and discharge cycles LOOP1 processes：
Under the conditions of first environment, following steps a to step c process is performed：
Step a, in the state of the shake table does not shake, the charging/discharging apparatus is opened, with Ic electric currents to tested
Electric automobile power battery charging is to maximum SOC；
Step b, the unlatching shake table so that the shake table is according to electrokinetic cell vibrational line during running car to tested
The electric automobile power battery of examination applies vibration, while being carried out using the charging/discharging apparatus to the electric automobile power battery
Electric discharge, when the electricity of electrokinetic cell is discharged, in the state of the shake table does not shake, with Ic electric currents to tested electricity
Electrical automobile power battery charging is to maximum SOC；
Step c, the b that repeats the above steps electric discharge charging process, and gather tested in above-mentioned steps b electric discharge charging process
Electric automobile power battery voltage, electric current, calculate electric discharge when tested electric automobile power battery is discharged every time
Capability value Q11iWith the maximum voltage difference Δ U of the cell in tested electric automobile power battery11i, and when recording total
Between t, wherein, i represent electric discharge number of times；
Under the conditions of the first environment, as the discharge capacity Q for calculating acquisition11iWhen there is downward trend, in second environment condition
Under, above-mentioned steps b and step c process is performed, wherein, above-mentioned steps b and step c mistake is performed under the conditions of second environment
Journey is identical with performing the above-mentioned steps b and step c duration of process under the conditions of first environment；
Perform under the conditions of the second environment above-mentioned steps b and step c process terminate after, under the 3rd environmental condition, after
The continuous process for performing above-mentioned steps b and step c, wherein, above-mentioned steps b and step c process is performed under the 3rd environmental condition,
The duration of process with performing above-mentioned steps b and step c under the conditions of first environment is identical；
After execution above-mentioned steps b and step c process terminates under the 3rd environmental condition, under the conditions of the 4th environment, after
The continuous process for performing above-mentioned steps b and step c, wherein, above-mentioned steps b and step c process is performed under the conditions of the 4th environment,
The duration of process with performing above-mentioned steps b and step c under the conditions of first environment is identical；
First environment condition stage, second environment condition stage, the 3rd environmental condition stage, the 4th environmental condition rank are fitted respectively
The approximate formula Q of sectiona1=fa1(t) with Δ Ua1=φa1(t)、Qa2=fa2(t) with Δ Ua2=φ12(t)、Qa3=f13And Δ (t)
Ua3=φa3(t)、Qa4=f14(t) with Δ Ua4=φa4(t), wherein, Qa1For the tested electronic vapour under the conditions of first environment
The value that the discharge capacity of car electrokinetic cell is changed over time, Δ Ua1For the tested electric powered motor under the conditions of first environment
The value that the maximum monomer voltage difference of battery changes with time t, Qa2For the tested electric powered motor under the conditions of second environment
The value that the discharge capacity of battery changes with time t, Δ Ua2For the tested electric automobile power battery under the conditions of second environment
Maximum monomer voltage difference with time t change value, Qa3For the tested electric automobile power battery under the 3rd environmental condition
The value that changes with time t of discharge capacity, Δ Ua3For the tested electric automobile power battery under the 3rd environmental condition most
The value that polymeric monomer voltage difference changes with time t, Qa4For putting for the tested electric automobile power battery under the conditions of the 4th environment
The value that capacitance changes with time t, Δ Ua4It is single for the maximum of the tested electric automobile power battery under the conditions of the 4th environment
The value that bulk voltage difference changes with time t, t is discharge time；
Terminate the first charge and discharge cycles LOOP1 processes.
7. electric automobile power battery life testing method according to claim 6, it is characterised in that utilize described first
Trend formula and the tested electric automobile power battery of second trend formula iterative calculation are successively in first environment condition, second
The tested electric automobile of the subsequent charge and discharge cycles carried out under the conditions of environmental condition, the 3rd environmental condition and the 4th environment
The maximum monomer voltage of the discharge capacity of electrokinetic cell and tested electric automobile power battery is poor, including：
By in the first charge and discharge cycles LOOP1, last complete discharge capacity value Q in the 4th environmental condition stage14nMost
Polymeric monomer voltage difference Δ U14nValue, be used as the second charge and discharge cycles LOOP2 the first environment condition stage first time electric discharge
Capability value Q211The maximum voltage difference Δ U of cell with first time in tested electric automobile power battery211, according to
The above-mentioned first environment condition stage, the second environment condition stage, the 3rd environmental condition stage, the 4th environmental condition stage it is approximate
Formula Qa1=fa1(t) with Δ Ua1=φa1(t)、Qa2=fa2(t) with Δ Ua2=φ12(t)、Qa3=f13(t) with Δ Ua3=φa3
(t)、Qa4=f14(t) with Δ Ua4=φa4(t), by Q211With Δ U211Derive the 4th environment in the second charge and discharge cycles LOOP2
Last complete discharge capacity Q in condition stage24nWith the poor Δ U of maximum monomer voltage24n；
Repetition uses above-mentioned calculating to obtain after the second charge and discharge cycles LOOP2 the 4th environment in each charge and discharge cycles successively
Last complete discharge capacity value in condition stage and maximum monomer voltage difference.
8. electric automobile power battery life testing method according to claim 5, it is characterised in that：
The first environment condition is：The thermostatic constant wet chamber is set as the first mean temperature and the first medial humidity；
The second environment condition is：The thermostatic constant wet chamber is set as the second mean temperature and the second medial humidity；
3rd environmental condition is：The thermostatic constant wet chamber is set as the 3rd mean temperature and the 3rd medial humidity；
4th environmental condition is：The thermostatic constant wet chamber is set as the 4th mean temperature and the 4th medial humidity.
9. electric automobile power battery life testing method according to claim 5, it is characterised in that：
The first environment condition, second environment condition, the 3rd environmental condition and the 4th environmental condition correspond to winter, spring respectively
The electric automobile power battery use environment condition in season, summer and autumn.
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