CN104749530B - A kind of electrokinetic cell discharges from power consumption Performance Decay evaluation method and device - Google Patents
A kind of electrokinetic cell discharges from power consumption Performance Decay evaluation method and device Download PDFInfo
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- CN104749530B CN104749530B CN201510171071.2A CN201510171071A CN104749530B CN 104749530 B CN104749530 B CN 104749530B CN 201510171071 A CN201510171071 A CN 201510171071A CN 104749530 B CN104749530 B CN 104749530B
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Abstract
The present invention relates to a kind of electric discharge of electrokinetic cell from power consumption Performance Decay evaluation method and device, wherein, this method includes：Determine the discharge current catastrophe point of electrokinetic cell starting stage and the discharge current catastrophe point of electrokinetic cell target phase；Wherein, the electrokinetic cell starting stage is the stage that electrokinetic cell begins to use, and the electrokinetic cell target phase is the stage that electrokinetic cell discharge voltage is decayed；Choose the discharge current catastrophe point and the discharge current catastrophe point of electrokinetic cell target phase of electrokinetic cell starting stage；According to correspondence ground voltage, electric current before and after correspondence ground voltage, electric current and the discharge current catastrophe point of the electrokinetic cell target phase before and after the discharge current catastrophe point of the electrokinetic cell starting stage to electrokinetic cell electric discharge power consumption Performance Decay estimation certainly.
Description
Technical field
The present invention relates to power battery technology field, more particularly to a kind of electrokinetic cell electric discharge is estimated from power consumption Performance Decay
Method and device.
Background technology
Electrokinetic cell electric discharge is one of key index of electrokinetic cell from power consumption Performance Decay rate, and the rate of disintegration is to reflect
The health status of battery, determines the charge-discharge energy utilization rate of battery again.
In practice, judge that battery discharge, from energy-dissipating property, passes through correspondingly detection device according to electrokinetic cell internal resistance
Electrokinetic cell is detected, the initial internal resistance of electrokinetic cell is directly obtained, then directly after detection electrokinetic cell performance degradation
Internal resistance, the electrokinetic cell internal resistance rate of disintegration is calculated using the internal resistance of cell after decay and initial internal resistance.Because the technology needs specially
Cell internal resistance detector device, and vehicle needs stagnation of movement, so as to add testing cost.
It is another in the prior art, do not possess directly obtain electrokinetic cell internal resistance instrument in the case of, to electric current I1, I2 distinguish
Value, I1, I2 are set according to battery capacity, and usual I1 spans are 0.01C to 0.1C, and I2 spans arrive for 1C
3C.Corresponding magnitude of voltage V1, V2 when electrokinetic cell reaches electric current I1, I2 are measured by ammeter, recorded when recording each measured value
The state-of-charge of corresponding ambient temperature and battery, initial resistance is calculated using V2, V1, I1, I2.Utilize same side
Method, value is distinguished to electric current I3, I4, and I3, I4 are set according to battery capacity, and usual I3 spans are 0.01C to 0.1C,
I4 spans are 1C to 3C.I3, I4 value condition are as I1, I2 value condition, it is ensured that obtain corresponding when I3, I4
Corresponding battery temperature when battery temperature, state-of-charge are with obtaining I1, I2.By ammeter measure electrokinetic cell reach electric current I3,
Corresponding magnitude of voltage V3, V4 during I4, meanwhile, when recording measured value, calculated using V3, V4, I3, I4 after electrokinetic cell decay
Resistance, utilize the internal resistance of cell after decay and initial internal resistance to calculate the electrokinetic cell internal resistance rate of disintegration.Because the technical scheme exists
When measuring relevant parameter, it is desirable to consistent to ensure the accuracy of measurement, test process is complicated, and testing cost is high.
The content of the invention
To solve problem of the prior art, the present invention proposes a kind of electrokinetic cell electric discharge from power consumption Performance Decay evaluation method
And device, on the basis of estimation precision is ensured, the battery discharge of low cost estimation electrokinetic cell is from consuming energy Performance Decay.
To achieve the above object, should the invention provides a kind of electric discharge of electrokinetic cell from power consumption Performance Decay evaluation method
Method includes：
Determine discharge current catastrophe point and the mutation of the discharge current of electrokinetic cell target phase of electrokinetic cell starting stage
Point；Wherein, the electrokinetic cell starting stage is the stage that electrokinetic cell begins to use, and the electrokinetic cell target phase is
The stage of power cell discharge voltage decay；
Choose discharge current catastrophe point and the mutation of the discharge current of electrokinetic cell target phase of electrokinetic cell starting stage
Point；
According to correspondence ground voltage before and after the discharge current catastrophe point of the electrokinetic cell starting stage, electric current and described dynamic
Correspondence ground voltage, electric current discharge electrokinetic cell from power consumption Performance Decay before and after the discharge current catastrophe point in power battery target stage
Estimation.
Preferably, the determination discharge current catastrophe point of electrokinetic cell starting stage and putting for electrokinetic cell target phase
The step of electric current break point is：
The discharge and recharge historical data obtained by electric car monitoring system determines the discharge current of electrokinetic cell starting stage
Catastrophe point and the discharge current catastrophe point of electrokinetic cell target phase.
Preferably, the formula estimated from power consumption Performance Decay that discharges electrokinetic cell is：
Wherein, I1 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell starting stage；V1 represents dynamic
Discharge voltage before the discharge current mutation point mutation of power battery starting stage；I2 represents the electric discharge electricity of electrokinetic cell starting stage
Discharge current after stream mutation point mutation；V2 represents the electric discharge electricity after the discharge current mutation point mutation of electrokinetic cell starting stage
Pressure；I3 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell target phase；V3 represents electrokinetic cell target
Discharge voltage before the discharge current mutation point mutation in stage；I4 represents that the discharge current catastrophe point of electrokinetic cell target phase is dashed forward
Discharge current after change；V4 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell target phase；S represents dynamic
Power battery discharge from consume energy Performance Decay rate.
To achieve the above object, present invention also offers a kind of electric discharge of electrokinetic cell from power consumption Performance Decay estimation device,
The device includes：
Discharge current catastrophe point determining unit, discharge current catastrophe point and power for determining the electrokinetic cell starting stage
The discharge current catastrophe point in battery target stage；Wherein, the electrokinetic cell starting stage is the rank that electrokinetic cell begins to use
Section, the electrokinetic cell target phase is the stage that electrokinetic cell discharge voltage is decayed；
Choose discharge current mutation dot element, discharge current catastrophe point and power for choosing the electrokinetic cell starting stage
The discharge current catastrophe point in battery target stage；
Evaluation unit, for before and after the discharge current catastrophe point according to the electrokinetic cell starting stage correspondence ground voltage,
Correspondence ground voltage, electric current discharge electrokinetic cell before and after the discharge current catastrophe point of electric current and the electrokinetic cell target phase
From power consumption Performance Decay estimation.
Preferably, the discharge and recharge history number that the discharge current catastrophe point determining unit is obtained by electric car monitoring system
According to the discharge current catastrophe point and the discharge current catastrophe point of electrokinetic cell target phase for determining the electrokinetic cell starting stage.
Preferably, the estimation equation that the evaluation unit is used for：
Wherein, I1 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell starting stage；V1 represents dynamic
Discharge voltage before the discharge current mutation point mutation of power battery starting stage；I2 represents the electric discharge electricity of electrokinetic cell starting stage
Discharge current after stream mutation point mutation；V2 represents the electric discharge electricity after the discharge current mutation point mutation of electrokinetic cell starting stage
Pressure；I3 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell target phase；V3 represents electrokinetic cell target
Discharge voltage before the discharge current mutation point mutation in stage；I4 represents that the discharge current catastrophe point of electrokinetic cell target phase is dashed forward
Discharge current after change；V4 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell target phase；S represents dynamic
Power battery discharge from consume energy Performance Decay rate.
Compared with prior art, following points advantage of the present invention：The technical program is according to the initial rank of electrokinetic cell
The electricity before and after electric current, voltage and the mutation point mutation of the discharge current of target phase before and after the discharge current mutation point mutation of section
Stream voltage determines the electrokinetic cell discharge voltage rate of disintegration, and catastrophe point is that the discharge and recharge obtained by electric car monitoring system is gone through
What history data were determined, without the special stagnation of movement of vehicle, the detecting instrument of specialty is not needed more so that ensureing estimation precision
On the basis of, the battery discharge of low cost estimation electrokinetic cell is from consuming energy Performance Decay.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 discharges from power consumption Performance Decay evaluation method flow chart for a kind of electrokinetic cell proposed by the present invention；
Fig. 2 estimates device block diagram for a kind of electrokinetic cell electric discharge proposed by the present invention from power consumption Performance Decay.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
To those skilled in the art, the discharge and recharge historical data obtained by electric car monitoring system determines dynamic
Internal resistance after the initial internal resistance of power battery and decay, obtained result accuracy is not high.Reason for this is that discharge and recharge historical data pair
Temperature, SOC and the current value answered are uncontrolled, it is impossible to ensure the uniformity of data Production conditions, so as to obtain the first of electrokinetic cell
Internal resistance accuracy after beginning internal resistance and decay is not also high.So, logically, electrokinetic cell electric discharge is declined from energy-dissipating property
Become estimation accuracy also not high.
Understood based on above-mentioned analysis, ambient temperature, state-of-charge when electrokinetic cell internal resistance value works with electrokinetic cell
Etc. (SOC) there is relation, to make the internal resistance value of electrokinetic cell has comparativity, it is thus necessary to determine that external world's temperature when electrokinetic cell works
Degree, state-of-charge (SOC) etc. are consistent, i.e. testing standard state.In the case where condition is inconsistent, it is determined that internal resistance value with
There is deviation in the internal resistance value under standard state.We introduce electrokinetic cell internal resistance temperature coefficient KTWith electrokinetic cell internal resistance SOC systems
Number KSOC, the initial internal resistance R under electrokinetic cell standard state(standard)Represent, the initial internal resistance under electrokinetic cell off-rating is used
R(T,SOC)To represent, R(T,SOC)=KT*KSOC*R(standard).Electrokinetic cell is using that can cause the internal resistance of cell to change, and the internal resistance of cell changes feelings
Condition can reflect the situation that battery performance deteriorates, and we reflect cell performance decay by estimating the attenuation rate of battery standard internal resistance
Situation.Internal resistance R ' after electrokinetic cell decay under standard state(standard)Represent, the initial internal resistance under electrokinetic cell standard state is
R(standard), R '(standard)With R(standard)Ratio can reflect the attenuation of battery performance.By the screening to historical data, it can look for
Go out the condition such as the conditions such as ambient temperature, the SOC of electrokinetic cell starting stage and the ambient temperature of electrokinetic cell target phase, SOC
Close discharge current catastrophe point, front and rear counteracting KTAnd KSOCInfluence, can be by R '(standard)With R(standard)Ratio be reduced to electric current
The ratio of difference and voltage difference.The internal resistance value of direct measurement battery is avoided, the internal resistance attenuation rate for obtaining electrokinetic cell is settled at one go.
As shown in figure 1, being discharged for a kind of electrokinetic cell proposed by the present invention from power consumption Performance Decay evaluation method flow chart；
This method includes：
Step 101)：Determine discharge current catastrophe point and the electric discharge of electrokinetic cell target phase of electrokinetic cell starting stage
Current break point；Wherein, the electrokinetic cell starting stage is the stage that electrokinetic cell begins to use, the electrokinetic cell target
Stage is the stage that electrokinetic cell discharge voltage is decayed；
Step 102)：Choose discharge current catastrophe point and the electric discharge of electrokinetic cell target phase of electrokinetic cell starting stage
Current break point；
Step 103)：According to correspondence ground voltage, electric current before and after the discharge current catastrophe point of the electrokinetic cell starting stage
And ground voltage, electric current are corresponded to before and after the discharge current catastrophe point of the electrokinetic cell target phase to electrokinetic cell electric discharge consumable
Can Performance Decay estimation.
Preferably, the determination discharge current catastrophe point of electrokinetic cell starting stage and putting for electrokinetic cell target phase
The step of electric current break point is：
The discharge and recharge historical data obtained by electric car monitoring system determines the discharge current of electrokinetic cell starting stage
Catastrophe point and the discharge current catastrophe point of electrokinetic cell target phase.
For the present embodiment, the discharge current catastrophe point of electrokinetic cell starting stage and electrokinetic cell target phase
Discharge current catastrophe point respectively selects one.So, the formula estimated from power consumption Performance Decay that discharges electrokinetic cell is：
Wherein, I1 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell starting stage；V1 represents dynamic
Discharge voltage before the discharge current mutation point mutation of power battery starting stage；I2 represents the electric discharge electricity of electrokinetic cell starting stage
Discharge current after stream mutation point mutation；V2 represents the electric discharge electricity after the discharge current mutation point mutation of electrokinetic cell starting stage
Pressure；I3 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell target phase；V3 represents electrokinetic cell target
Discharge voltage before the discharge current mutation point mutation in stage；I4 represents that the discharge current catastrophe point of electrokinetic cell target phase is dashed forward
Discharge current after change；V4 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell target phase；S represents dynamic
Power battery discharge from consume energy Performance Decay rate.
For the present embodiment, the discharge current catastrophe point and a power electric of two electrokinetic cell starting stages is chosen
The discharge current catastrophe point of pond target phase, then, to electrokinetic cell electric discharge from during power consumption Performance Decay estimation, by previous dynamic
The discharge current catastrophe point of power battery starting stage and the discharge current catastrophe point of electrokinetic cell target phase obtain the first power
Battery discharge is from the Performance Decay rate S1 of consuming energy；Pass through the discharge current catastrophe point and electrokinetic cell of latter electrokinetic cell starting stage
The discharge current catastrophe point of target phase obtains the electric discharge of the second electrokinetic cell from power consumption Performance Decay rate S2, finally, by S1 and S2
Average, obtained result is discharged from power consumption Performance Decay rate for final electrokinetic cell.
Likewise, for the present embodiment, when the discharge current catastrophe point for choosing an electrokinetic cell starting stage and
The discharge current catastrophe point of two electrokinetic cell target phases is, then, to electrokinetic cell electric discharge from power consumption Performance Decay estimation
When, pass through the discharge current catastrophe point and the discharge current catastrophe point of previous electrokinetic cell target phase of electrokinetic cell starting stage
The electric discharge of the first electrokinetic cell is obtained from power consumption Performance Decay rate S1；By the discharge current catastrophe point of electrokinetic cell starting stage and
The discharge current catastrophe point of latter electrokinetic cell target phase obtains the second electrokinetic cell electric discharge power consumption Performance Decay rate S2 certainly, most
Afterwards, S1 and S2 are averaged, obtained result is discharged from power consumption Performance Decay rate for final electrokinetic cell.
To sum up, as long as choosing condition and the electrokinetic cell target phase of the discharge current catastrophe point of electrokinetic cell starting stage
Discharge current catastrophe point condition it is similar, no matter whether number identical, electrokinetic cell electric discharge is directly asked in the manner described above
From power consumption Performance Decay rate, by the rate of disintegration be can determine that electrokinetic cell initial internal resistance and decay after internal resistance.
As shown in Fig. 2 estimating device block diagram from power consumption Performance Decay for a kind of electrokinetic cell electric discharge proposed by the present invention.Should
Device includes：
Discharge current catastrophe point determining unit 201, for determine the electrokinetic cell starting stage discharge current catastrophe point and
The discharge current catastrophe point of electrokinetic cell target phase；Wherein, the electrokinetic cell starting stage begins to use for electrokinetic cell
Stage, the electrokinetic cell target phase be electrokinetic cell discharge voltage decay stage；
Choose discharge current mutation dot element 202, for choose the electrokinetic cell starting stage discharge current catastrophe point and
The discharge current catastrophe point of electrokinetic cell target phase；
Evaluation unit 203, for accordingly electric before and after the discharge current catastrophe point according to the electrokinetic cell starting stage
Correspondence ground voltage, electric current are to electrokinetic cell before and after pressure, electric current and the discharge current catastrophe point of the electrokinetic cell target phase
Electric discharge is estimated from power consumption Performance Decay.
Preferably, the discharge and recharge history number that the discharge current catastrophe point determining unit is obtained by electric car monitoring system
According to the discharge current catastrophe point and the discharge current catastrophe point of electrokinetic cell target phase for determining the electrokinetic cell starting stage.
For the present embodiment, the discharge current catastrophe point of electrokinetic cell starting stage and electrokinetic cell target phase
Discharge current catastrophe point respectively selects one.So, the estimation equation that the evaluation unit is used for：
Wherein, I1 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell starting stage；V1 represents dynamic
Discharge voltage before the discharge current mutation point mutation of power battery starting stage；I2 represents the electric discharge electricity of electrokinetic cell starting stage
Discharge current after stream mutation point mutation；V2 represents the electric discharge electricity after the discharge current mutation point mutation of electrokinetic cell starting stage
Pressure；I3 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell target phase；V3 represents electrokinetic cell target
Discharge voltage before the discharge current mutation point mutation in stage；I4 represents that the discharge current catastrophe point of electrokinetic cell target phase is dashed forward
Discharge current after change；V4 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell target phase；S represents dynamic
Power battery discharge from consume energy Performance Decay rate.
Although it should be noted that the electrokinetic cell electric discharge referred in above-detailed estimates device from power consumption Performance Decay
For a kind of device of appliance computer software code realization, some units or module that the device includes, but this division
It is only not enforceable.In fact, according to the embodiment of the present invention, the feature of two or more above-described devices and
Function can embody in a system.Conversely, the feature and function of an above-described system can be divided further
To be embodied by multiple devices.
In actual motion, initial internal resistance, decay internal resistance and the power of electrokinetic cell are obtained using prior art
Battery discharge can be thus produced caused by vehicle stops from the Performance Decay rate that consumes energy, it is necessary to special by vehicle lay-off one day
Economic loss, in addition, the instrument and equipment that prior art needs some professional are participated, in addition it is also necessary to entered in this respect
Row expense is put into, in addition, in addition it is also necessary to the expenditure of personnel cost.And the technical scheme of the application is used, in order to obtain electrokinetic cell
Electric discharge only has outside expenditure from power consumption Performance Decay rate in human cost, allows vehicle lay-off without special, volume is not needed more
The use of outer professional equipment.Therefore, in the case of the much the same object information of precision is obtained, the technical program is put into expense
On it is more much less than prior art.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (4)
- The Performance Decay evaluation method 1. a kind of electrokinetic cell electric discharge is consumed energy certainly, it is characterised in that this method includes：Determine the discharge current catastrophe point of electrokinetic cell starting stage and the discharge current catastrophe point of electrokinetic cell target phase；Its In, the electrokinetic cell starting stage is the stage that electrokinetic cell begins to use, and the electrokinetic cell target phase is power electric The stage of tank discharge voltage attenuation；Choose the discharge current catastrophe point and the discharge current catastrophe point of electrokinetic cell target phase of electrokinetic cell starting stage；According to correspondence ground voltage, electric current and the power electric before and after the discharge current catastrophe point of the electrokinetic cell starting stage Correspondence ground voltage, electric current are estimated to electrokinetic cell electric discharge from power consumption Performance Decay before and after the discharge current catastrophe point of pond target phase Calculate；Wherein, the formula estimated from power consumption Performance Decay that discharges electrokinetic cell is：<mrow> <mi>S</mi> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <mi>V</mi> <mn>4</mn> <mo>-</mo> <mi>V</mi> <mn>3</mn> <mo>)</mo> <mo>&times;</mo> <mo>(</mo> <mi>I</mi> <mn>2</mn> <mo>-</mo> <mi>I</mi> <mn>1</mn> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <mi>V</mi> <mn>2</mn> <mo>-</mo> <mi>V</mi> <mn>1</mn> <mo>)</mo> <mo>&times;</mo> <mo>(</mo> <mi>I</mi> <mn>4</mn> <mo>-</mo> <mi>I</mi> <mn>3</mn> <mo>)</mo> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> </mrow>Wherein, I1 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell starting stage；V1 represents power electric Discharge voltage before the discharge current mutation point mutation of pond starting stage；I2 represents that the discharge current of electrokinetic cell starting stage is dashed forward The discharge current become after point mutation；V2 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell starting stage； I3 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell target phase；V3 represents the electrokinetic cell target phase Discharge current mutation point mutation before discharge voltage；I4 is represented after the discharge current mutation point mutation of electrokinetic cell target phase Discharge current；V4 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell target phase；S represents power electric Tank discharge from consume energy Performance Decay rate.
- 2. the method as described in claim 1, it is characterised in that the discharge current mutation of the determination electrokinetic cell starting stage Point and the electrokinetic cell target phase discharge current catastrophe point the step of be：The discharge and recharge historical data obtained by electric car monitoring system determines the discharge current mutation of electrokinetic cell starting stage Point and the discharge current catastrophe point of electrokinetic cell target phase.
- 3. a kind of electrokinetic cell electric discharge estimates device from power consumption Performance Decay, it is characterised in that the device includes：Discharge current catastrophe point determining unit, discharge current catastrophe point and electrokinetic cell for determining the electrokinetic cell starting stage The discharge current catastrophe point of target phase；Wherein, the electrokinetic cell starting stage is the stage that electrokinetic cell begins to use, institute It is the stage that electrokinetic cell discharge voltage is decayed to state the electrokinetic cell target phase；Choose discharge current mutation dot element, discharge current catastrophe point and electrokinetic cell for choosing the electrokinetic cell starting stage The discharge current catastrophe point of target phase；Evaluation unit, for correspondence ground voltage, electric current before and after the discharge current catastrophe point according to the electrokinetic cell starting stage And ground voltage, electric current are corresponded to before and after the discharge current catastrophe point of the electrokinetic cell target phase to electrokinetic cell electric discharge consumable Can Performance Decay estimation；Wherein, the estimation equation that the evaluation unit is used for：<mrow> <mi>S</mi> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <mi>V</mi> <mn>4</mn> <mo>-</mo> <mi>V</mi> <mn>3</mn> <mo>)</mo> <mo>&times;</mo> <mo>(</mo> <mi>I</mi> <mn>2</mn> <mo>-</mo> <mi>I</mi> <mn>1</mn> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <mi>V</mi> <mn>2</mn> <mo>-</mo> <mi>V</mi> <mn>1</mn> <mo>)</mo> <mo>&times;</mo> <mo>(</mo> <mi>I</mi> <mn>4</mn> <mo>-</mo> <mi>I</mi> <mn>3</mn> <mo>)</mo> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> </mrow>Wherein, I1 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell starting stage；V1 represents power electric Discharge voltage before the discharge current mutation point mutation of pond starting stage；I2 represents that the discharge current of electrokinetic cell starting stage is dashed forward The discharge current become after point mutation；V2 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell starting stage； I3 represents the discharge current before the discharge current mutation point mutation of electrokinetic cell target phase；V3 represents the electrokinetic cell target phase Discharge current mutation point mutation before discharge voltage；I4 is represented after the discharge current mutation point mutation of electrokinetic cell target phase Discharge current；V4 represents the discharge voltage after the discharge current mutation point mutation of electrokinetic cell target phase；S represents power electric Tank discharge from consume energy Performance Decay rate.
- 4. device as claimed in claim 3, it is characterised in that the discharge current catastrophe point determining unit is supervised by electric car The discharge and recharge historical data that examining system is obtained determines the discharge current catastrophe point and electrokinetic cell target of electrokinetic cell starting stage The discharge current catastrophe point in stage.
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