CN106569143A - Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle - Google Patents
Method and system for on-line calculation of electrical core capacity and state of health (SOH), and electric vehicle Download PDFInfo
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- CN106569143A CN106569143A CN201610995525.2A CN201610995525A CN106569143A CN 106569143 A CN106569143 A CN 106569143A CN 201610995525 A CN201610995525 A CN 201610995525A CN 106569143 A CN106569143 A CN 106569143A
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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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to a method and system for on-line calculation of an electrical core capacity and a state of health (SOH), and an electric vehicle. The method comprises: a datum curve is established according to a charging/discharging situation of a new electric core; a correspondence relationship of translation values between charging/discharging curves of electric cores with different capacities and datum curves and electric core capacities is established, wherein the positive material types of the electric cores with different capacities and the new electric cores are identical; a translation value between a charging/discharging curve of an electric core with the capacity needing to be measured and the datum curve is obtained, and the electric core capacity corresponding to the translation value is calculated according to the correspondence relationship of the translation value and the electric core capacity. According to the method, translation of a practically measured charging or discharging curve is realized and a relationship between the translation value and the capacity is established; and on the basis of the correspondence relationship between the capacity and the translation value, the electric core capacity and the SOH are calculated. The method has advantages of data accuracy, simple operation, online computing realization, simpleness in realization, and small error.
Description
Technical field
The present invention relates to electric vehicle technical field, more particularly to a kind of method in line computation battery core capacity and SOH, it is
System and electric vehicle.
Background technology
Key components and partss of the electrokinetic cell system as electric automobile, its performance and application level have impact on electric automobile and send out
Exhibition and popularization.How on the basis of state of the art so as to keep good chemical property for a long time, it is ensured that actually make
Safety and reliability with, Shi Ge great electrokinetic cell systems producer more concern.At present, develop remote monitoring system
System, as a kind of data acquisition modes of new battery management system, by the extensive of each big battery producer and car load factory
Concern.The long distance control system can carry out monitor in real time to the working condition of electrokinetic cell system, and to battery status parameter
Be acquired, make research worker battery system running status just can be understood at any time in Surveillance center, and obtain every electricity in real time
Pond parameter.
As the access times of battery core are continuously increased, the residual capacity of single battery core can be gradually decreased, i.e., battery core there occurs
Capacity attenuation, between cell, difference also will be projected therewith.But real vehicle is in actual moving process, battery core is difficult to realize full
Full of putting, therefore cannot accurately obtain the actual residual capacity of battery core.If can timely tracking and monitoring lithium ion power electricity
The situation of core, accurately estimates the health status of Li-ion batteries piles, takes corresponding treatment measures accordingly, will to health status
The cell for reaching or having reached marginal value is changed, it is ensured that Li-ion batteries piles are operated in optimum state, then can pole
The earth extends the health status of whole Li-ion batteries piles, cost-effective, has very high economic worth.
The health degree (SOH, State of Health) of battery, refers under certain condition, battery can be filled with or release
The percentage ratio of electricity and battery nominal capacity.SOH is demonstrated by the capacity of present battery in the form of percentage ratio, new to one piece
Battery for, its SOH value will be generally above 100%, and with the use of battery, constantly aging, SOH gradually drops battery
It is low.Specify in GB/T, when the capacity of electrokinetic cell drops to 80%, i.e., when SOH is less than 80%, should just change electricity
Pond.There are the direct electric discharge of method of following several SOH estimation, internal resistance method, electrochemical analysis, modelling etc. at present.More than
The reasons such as method testing time length, inner walkway are difficult, the complicated difficulty of modeling, it is difficult to real-time online estimates the healthy shape of battery core
State.
Direct electric discharge：The capacity released from full state with certain multiplying power discharging to blanking voltage by battery and its institute
The ratio of corresponding nominal capacity can be used as measurement battery standard.The SOH of off-line test battery is needed, this is to power train in vehicle application electricity
Realize for pond that the difficult and testing time is oversize.
Internal resistance method：SOH is estimated mainly by the relation set up between internal resistance and SOH, when battery capacity have dropped original
After 25% or 30% for coming, the internal resistance of cell just has significantly change, and specifies to drop to 80% when battery capacity in standard
When battery should just be replaced, so the SOH difficulty for wanting real-time estimation battery by this method is larger, and the internal resistance of cell
Very little, usually milliohm level, belong to small-signal, want accurately to measure the internal resistance of cell also relatively difficult.This method does not also have at present
It is on the actual application.
Electrochemical analysis：It is a kind of more complicated method, and its main thought is to apply multiple sinusoidal letters to battery
Number, the frequency of these signals is different, and then the data message analysis with fuzzy theory to having collected, predicts battery
Current performance.Before with the method, need to do substantial amounts of data collection and analysis, to obtain the characteristic of such battery, but also
Need more sturdy with regard to impedance and the theoretical knowledge of impedance spectrum, in addition cost is also costly.This kind of side in sum
Method is also not suitable for pure electric automobile at present.
Modelling：The main thought of this method is to be set up by data such as detection voltage, electric current, temperature based on this
The model of battery, calculates the decay of battery capacity with this model, draws the SOH of battery.Firstly the need of carrying out instead to battery
Repetition measurement is tried, the relation curve of capacity after obtaining resistance value and decaying.Also resistance is calculated indirectly according to suitable battery model, then
Tried to achieve according to relation curve computation of table lookup.Algorithm is relatively complicated, and estimation difference is larger.
The content of the invention
The technical problem to be solved is for the deficiencies in the prior art, there is provided one kind is in line computation battery core capacity
Method, system and electric vehicle with SOH.The present invention sets up translational movement by translating to surveying charge or discharge curve
With the relation of capacity, using capacity and the corresponding relation of translational movement, battery core capacity and SOH, methods described the data precision are calculated
It is high, simple to operate, line computation is may be implemented in, realizes that simply error is little.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of method in line computation battery core capacity and SOH,
Comprise the steps：
S1, sets up datum curve according to the charge/discharge situation of new battery core；
S2, the charge/discharge curve for setting up different capabilities battery core are corresponding with battery core capacity with the translational movement between datum curve
Relation, wherein different capabilities battery core are identical with the positive electrode species of new battery core described in S1；
S3, obtains the translational movement between the charge/discharge curve and datum curve of capacity battery core to be measured, according to the translational movement with
The corresponding relation of battery core capacity calculates the corresponding battery core capacity of the translational movement.
The invention has the beneficial effects as follows：The present invention sets up translational movement by translating to surveying charge or discharge curve
With the relation of capacity, using capacity and the corresponding relation of translational movement, battery core capacity and SOH, methods described the data precision are calculated
It is high, simple to operate, line computation is may be implemented in, realizes that simply error is little.
Another technical scheme that the present invention solves above-mentioned technical problem is as follows：It is a kind of in line computation battery core capacity and SOH
System, including：
Datum curve sets up module, sets up datum curve for the charge/discharge situation according to new battery core；
Corresponding relation building module, for setting up the translation between the charge/discharge curve and datum curve of different capabilities battery core
The corresponding relation of amount and battery core capacity, wherein different capabilities battery core are identical with the positive electrode species of the new battery core；
Battery core capacity calculation module, for obtaining the translation between the charge/discharge curve and datum curve of capacity battery core to be measured
Amount, according to the corresponding battery core capacity of the translational movement and the corresponding relation of the battery core capacity calculating translational movement.
The invention has the beneficial effects as follows：The present invention sets up translational movement by translating to surveying charge or discharge curve
With the relation of capacity, using capacity and the corresponding relation of translational movement, battery core capacity and SOH, methods described the data precision are calculated
It is high, simple to operate, line computation is may be implemented in, realizes that simply error is little.
Another technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of electric vehicle, including above-mentioned technical side
The system in line computation battery core capacity and SOH described in case.
The invention has the beneficial effects as follows：The present invention sets up translational movement by translating to surveying charge or discharge curve
With the relation of capacity, using capacity and the corresponding relation of translational movement, battery core capacity and SOH, methods described the data precision are calculated
It is high, simple to operate, line computation is may be implemented in, realizes that simply error is little.
Description of the drawings
Fig. 1 is the method indicative flowchart in line computation battery core capacity and SOH provided in an embodiment of the present invention；
Fig. 2 is the curve to be moved and datum curve schematic diagram before translating described in the embodiment of the present invention 1；
Fig. 3 is the curve to be moved and datum curve schematic diagram after translating described in the embodiment of the present invention 1；
Fig. 4 is translational movement described in the embodiment of the present invention 1 and battery core capacity matched curve schematic diagram；
Fig. 5 is the curve to be moved and datum curve schematic diagram before translating described in the embodiment of the present invention 2；
Fig. 6 is the curve to be moved and datum curve schematic diagram after translating described in the embodiment of the present invention 2；
Fig. 7 is translational movement described in the embodiment of the present invention 2 and battery core capacity matched curve schematic diagram；
Fig. 8 is the curve to be moved and datum curve schematic diagram before translating described in the embodiment of the present invention 3；
Fig. 9 is the curve to be moved and datum curve schematic diagram after translating described in the embodiment of the present invention 3；
Figure 10 is translational movement described in the embodiment of the present invention 3 and battery core capacity matched curve schematic diagram；
Figure 11 is the curve to be moved and datum curve schematic diagram before translating described in the embodiment of the present invention 4；
Figure 12 is the curve to be moved and datum curve schematic diagram after translating described in the embodiment of the present invention 4；
Figure 13 is translational movement described in the embodiment of the present invention 4 and battery core capacity matched curve schematic diagram；
Figure 14 is the schematic block diagram in line computation battery core capacity and the system of SOH provided in an embodiment of the present invention.
Specific embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
As Fig. 1 gives provided in an embodiment of the present invention a kind of schematically flow with the method for SOH in line computation battery core capacity
Cheng Tu.As shown in figure 1, a kind of method in line computation battery core capacity and SOH, comprises the steps：
110, datum curve is set up according to the charge/discharge situation of new battery core；
120, the charge/discharge curve for setting up different capabilities battery core is corresponding with battery core capacity with the translational movement between datum curve
Relation, wherein different capabilities battery core are identical with the positive electrode species of new battery core described in S1；
130, the translational movement between the charge/discharge curve and datum curve of capacity battery core to be measured is obtained, according to the translational movement
Battery core capacity corresponding with the corresponding relation of the battery core capacity calculating translational movement.
In above-described embodiment, set up by measured data between the charge/discharge curve and datum curve of different capabilities battery core
The corresponding relation of translational movement and battery core capacity, further according to capacity battery core to be measured charge/discharge curve and datum curve between translation
Amount is searched corresponding relation and calculates the corresponding battery core capacity of the translational movement, and without the need for data modeling, charging and discharging curve is actual measurement number
According to the data precision is high；Curvilinear translation can process software by expert datas such as data processing software, such as MATLAB can be complete
Into, it is simple to operate, may be implemented in line computation；Battery management system BMS can record cell voltage when electric motor car runs at any time and become
Change, data can be obtained in time online；Method is simple, and error is little.
It should be understood that in this embodiment, used as one embodiment of the present of invention, S1 includes：To new battery core with default multiplying power
Charge/discharge cycle is carried out, after new battery core charge/discharge capacity is stable, curve on the basis of wherein one charge/discharge curve is chosen.
Alternatively, as one embodiment of the present of invention, a kind of method in line computation battery core capacity and SOH, including such as
Lower step：
210, datum curve is set up according to the charge/discharge situation of new battery core；
220, the battery core charge/discharge curve with different capabilities is translated along preset coordinate axle, the battery core charge/discharge is made
The characteristic curve of curve is overlapped with the characteristic curve of datum curve；The battery core charge/discharge curve of statistics different capabilities is along default seat
The translational movement of parameter, sets up the corresponding relation of the translational movement and battery core capacity；Wherein, the characteristic curve be on curve on
The curve of the default characteristic interval chosen, wherein different capabilities battery core are identical with the positive electrode species of new battery core described in S1；
230, the translational movement between the charge/discharge curve and datum curve of capacity battery core to be measured is obtained, according to the translational movement
Battery core capacity corresponding with the corresponding relation of the battery core capacity calculating translational movement.
The battery core charge and discharge curve of different positive electrodes is different.But every kind of curve all includes specific discharge and recharge area
Between.Specific interval in using charge or discharge curve, is then translated different charge or discharge curves by x-axis or y-axis
Overlap with datum curve, set up the relation of x-axis or y-axis translational movement and capacity.And then according to x-axis or y-axis translational movement, estimate battery core
Capacity and SOH.
In above-described embodiment, by finding the specific interval in charge or discharge curve, then translated by x-axis or y-axis
Different charge or discharge curves is overlapped with datum curve, the relation of x-axis or y-axis translational movement and battery core capacity is set up；Need to
The charging curve or discharge curve of the battery core of estimated capacity is wanted to overlap with datum curve by x-axis or y-axis translation, it is bent by being fitted
Line computation x-axis or the corresponding battery core capacity of y-axis translational movement.
Also, during estimated capacity, need to only obtain the characteristic interval of charge or discharge curve, it is not necessary to which battery core is completely full of
Put, be more suitable for real vehicle running status.When using electric motor car, battery charge or discharge under which kind of state have random user
Property, battery of electric vehicle can't be made to charge when reaching entirely without electricity, or stop charging after being completely filled with.Under dead ship condition,
User can be charged as needed at any time.
It should be understood that the corresponding relation that the translational movement is set up in the embodiment with battery core capacity is to be to set up translational movement
With the matched curve of battery core capacity.The present invention passes through to find the specific interval in charge or discharge curve, then by x-axis or y
Different charge or discharge curves is overlapped by axle translation with datum curve, sets up the relation of x-axis or y-axis translational movement and capacity.Will
Need the curve negotiating x-axis or y-axis translation of estimated capacity to overlap with datum curve, x-axis or y-axis translation are calculated by matched curve
Corresponding capacity is measured, while obtaining SOH.
Alternatively, one embodiment of the invention carried out by, a kind of method in line computation battery core capacity and SOH, including it is as follows
Step：
310, datum curve is set up according to the charge/discharge situation of new battery core；
320, the battery core charge/discharge curve with different capabilities is translated along preset coordinate axle, the battery core charge/discharge is made
The characteristic curve of curve is overlapped with the characteristic curve of datum curve；The battery core charge/discharge curve of statistics different capabilities is along default seat
The translational movement of parameter, sets up the corresponding relation of the translational movement and battery core capacity；
330, the charge/discharge curve of capacity battery core to be measured is translated along preset coordinate axle, the spy of the charge/discharge curve is made
Levy curve to overlap with the characteristic curve of datum curve；Translational movement of the charge/discharge curve along preset coordinate axle is obtained, according to institute
State translational movement battery core capacity corresponding with the corresponding relation of the battery core capacity calculating translational movement；Wherein, the characteristic curve is
The curve of the default characteristic interval chosen on the curve.
It should be understood that in the embodiment, the default characteristic interval is characteristic interval of the voltage change ratio more than preset value.
In above-described embodiment, without the need for data modeling, charging and discharging curve is measured data, and the data precision is high, by right
A certain section of characteristic interval of actual measurement charge or discharge curve is translated, and sets up the relation of translational movement and capacity；Using capacity with
The corresponding relation of translational movement, estimation battery core capacity and SOH；Curvilinear translation can pass through the data processing software (specialty such as such as MATLAB
Data processing software) complete, it is simple to operate, may be implemented in line computation；During estimated capacity, only charge or discharge curve need to be obtained
Characteristic area, it is not necessary to battery core completely full of putting, be more suitable for real vehicle running status (user when using electric motor car, battery
The charge or discharge under which kind of state have randomness, and battery of electric vehicle can't be made to charge when reaching entirely without electricity, or complete
Stop charging full of rear entirely.Under dead ship condition, user can be charged as needed at any time.).BMS (battery management system) can be with
Cell voltage change when Shi Jilu electric motor cars run, can obtain data in time online, and method described in the embodiment is simple, by mistake
Difference is little.
Alternatively, as one embodiment of the invention, a kind of method in line computation battery core capacity and SOH, including it is as follows
Step：
410, datum curve is set up according to the charge/discharge situation of new battery core；
420, the charge/discharge curve for setting up different capabilities battery core is corresponding with battery core capacity with the translational movement between datum curve
Relation, wherein different capabilities battery core are identical with the positive electrode species of new battery core described in S1；
430, the translational movement between the charge/discharge curve and datum curve of capacity battery core to be measured is obtained, according to the translational movement
Battery core capacity corresponding with the corresponding relation of the battery core capacity calculating translational movement.
440, according to ratio calculation SOH of the battery core capacity and nominal capacity of capacity battery core to be measured.
In above-described embodiment, without the need for data modeling, charging and discharging curve is measured data, and the data precision is high, by right
A certain section of characteristic interval of actual measurement charge or discharge curve is translated, and sets up the relation of translational movement and capacity；Using capacity with
The corresponding relation of translational movement, estimation battery core capacity and SOH；Curvilinear translation can pass through the data processing software (specialty such as such as MATLAB
Data processing software) complete, it is simple to operate, may be implemented in line computation；During estimated capacity, only charge or discharge curve need to be obtained
Characteristic area, it is not necessary to battery core completely full of putting, be more suitable for real vehicle running status (user when using electric motor car, battery
The charge or discharge under which kind of state have randomness, and battery of electric vehicle can't be made to charge when reaching entirely without electricity, or complete
Stop charging full of rear entirely.Under dead ship condition, user can be charged as needed at any time.).BMS (battery management system) can be with
Cell voltage change when Shi Jilu electric motor cars run, can obtain data in time online, and method described in the embodiment is simple, by mistake
Difference is little.
The battery core type that the present invention program is suitable for is classified according to the different of positive electrode.Applicable battery core type has：
(1) just extremely plurality of layers shape positive electrode, structural formula is LiNixCoyMnzO2, wherein 0≤x≤1,0≤y≤1,0
≤ z≤1, x+y+z=1；
(2) just extremely plurality of layers shape positive electrode, structural formula is LiNixCoyAlzO2, 0≤x≤1,0≤y≤1,0≤z≤
1, x+y+z=1；
(3) just extremely lithium iron phosphate positive material, structural formula is LiFePO4；
(4) just extremely spinels positive electrode, structural formula is LiMn2O4、LiNi0.5Mn1.5O4。
Elaborate the content of the embodiment of the present invention below by taking different battery core species as an example.
1) battery core species：Just extremely plurality of layers shape positive electrode, structural formula is LiNi0.5Co0.2Mn0.3O2, write a Chinese character in simplified form
NCM523, square aluminum hull, rated capacity 42Ah.
Alternatively, a kind of method in line computation battery core capacity and SOH is provided as one embodiment of the invention, including such as
Lower step：
1. datum curve is chosen：To new battery core with certain multiplying power charge/discharge cycle, treat that battery core charge/discharge capacity is stable
Afterwards, choose curve on the basis of a charging curve therein.
2. selected characteristic is interval：The charging initial stage is chosen, one section of curve is characterized curve to change in voltage faster in front and back.As schemed
2nd, shown in 3.Fig. 2 is the curve to be moved and datum curve schematic diagram before translation.Fig. 3 is the curve to be moved and benchmark after translation
Curve synoptic diagram.
3. a plurality of cyclic curve is translated, make the characteristic curve section of every curve overlap with datum curve.
4. translational movement of the different curves in Y direction relative datum curve is counted.
5., according to different cyclic curve translational movements and capacity, capacity-translational movement curve is set up in fitting.As shown in Figure 4.Fig. 4
For translational movement and battery core capacity matched curve schematic diagram.Table 1 is for the corresponding battery core actual capacity of different cycle-indexes, SOH and puts down
The relation table of shifting amount.In table 1, data are used for setting up the data summarization used with battery core capacity relationship by translational movement, and SOH is true
Value.
Table 1
| Cycle-index | Actual capacity | SOH | X-axis translational movement | Y-axis translational movement/mV |
| 2 | 39.613 | 96.6% | 180 | -2 |
| 10 | 39.789 | 97.0% | 160 | 2 |
| 20 | 40.243 | 98.2% | 120 | 5 |
| 30 | 40.242 | 98.2% | 100 | 2 |
| 40 | 40.054 | 97.7% | 90 | 1 |
| 50 | 40.054 | 97.7% | 90 | 0 |
| 60 | 40.224 | 98.1% | 66 | 2 |
| 70 | 39.824 | 97.1% | 97 | -1 |
| 80 | 40.379 | 98.5% | 15 | 1 |
| 90 | 40.219 | 98.1% | 23 | 0 |
| 100 | 40.343 | 98.4% | 0 | 0 |
6. matched curve Cap=0.0634A+40.032 is obtained, and wherein Cap is battery core estimated capacity, and A is Y-axis translational movement.
7. pair battery core difference cyclic curve carries out curvilinear translation, estimated capacity and SOH according to above-mentioned 2～4 step.Estimation knot
Fruit is as shown in table 2.Table 2 is after translational movement and battery core capacity relationship is set up, for verifying that the data of matched curve accuracy are converged
Always, real SOH is wherein listed in table with estimation SOH.
Table 2
| Cycle-index | X-axis translational movement | Y-axis translational movement | Actual capacity | SOH | Estimated capacity | Estimation SOH | Error |
| 300 | -85 | -14 | 39.267 | 95.8% | 39.144 | 95.5% | - 0.312% |
| 500 | -95 | -20 | 38.797 | 94.6% | 38.764 | 94.5% | - 0.085% |
| 800 | -88 | -37 | 37.468 | 91.4% | 37.686 | 91.9% | 0.582% |
| 900 | -105 | -43 | 37.159 | 90.6% | 37.306 | 91.0% | 0.395% |
| 1000 | -117 | -48 | 36.789 | 89.7% | 36.989 | 90.2% | 0.543% |
| 1400 | -114 | -75 | 34.672 | 84.6% | 35.277 | 86.0% | 1.745% |
2) battery core species：Just extremely plurality of layers shape positive electrode, structural formula is LiNi0.5Co0.2Mn0.3O2, write a Chinese character in simplified form
NCM523, square aluminum hull, rated capacity 42Ah.
Alternatively, a kind of method in line computation battery core capacity and SOH is provided as one embodiment of the invention, including such as
Lower step：
1. datum curve is chosen：To new battery core with certain multiplying power charge/discharge cycle, treat that battery core charge/discharge capacity is stable
Afterwards, choose curve on the basis of a charging curve therein.
2. selected characteristic is interval：Charging mid-term is chosen, one section of curve is characterized curve to change in voltage faster in front and back.As schemed
5th, shown in 6.Fig. 5 is the curve to be moved and datum curve schematic diagram before translation.Fig. 6 is the curve to be moved and benchmark after translation
Curve synoptic diagram.
3. a plurality of cyclic curve is translated, make the characteristic curve section of every curve overlap with datum curve.
4. translational movement of the different curves in Y direction relative datum curve is counted.
5., according to different cyclic curve translational movements and capacity, capacity-translational movement curve is set up in fitting.Fig. 7 be translational movement with
Battery core capacity matched curve schematic diagram.Relation of the table 3 for the corresponding battery core actual capacity of different cycle-indexes, SOH and translational movement
Table.In table 3, data are used for setting up the data summarization used with battery core capacity relationship by translational movement, and SOH is actual value.
Table 3
| Cycle-index | Actual capacity | SOH | Y-axis translational movement/mV |
| 10 | 39.789 | 97.0% | 80 |
| 50 | 40.054 | 97.7% | 30 |
| 100 | 40.343 | 98.4% | 0 |
6. matched curve Cap=-0.0068A+40.31 is obtained, and wherein Cap is battery core estimated capacity, and A is Y-axis translational movement.
7. pair battery core difference cyclic curve carries out curvilinear translation, estimated capacity and SOH according to above-mentioned 2～4 step.Estimation knot
Fruit such as table 4.Table 4 be after translational movement and battery core capacity relationship is set up, for verifying the data summarization of matched curve accuracy, its
Real SOH is listed in middle table with estimation SOH.
Table 4
| Cycle-index | Y-axis translational movement/mV | Actual capacity | SOH | Estimated capacity | Estimation SOH | Error |
| 500 | 210 | 38.797 | 94.6% | 38.882 | 94.8% | 0.22% |
| 1000 | 500 | 36.789 | 89.7% | 36.91 | 90.0% | 0.33% |
| 1400 | 781 | 34.672 | 84.6% | 34.9992 | 85.4% | 0.94% |
3) battery core species：Just extremely lithium iron phosphate positive material, structural formula is LiFePO4, write a Chinese character in simplified form LFP, square aluminum hull, volume
Constant volume 86Ah.
Alternatively, a kind of method in line computation battery core capacity and SOH is provided as one embodiment of the invention, including such as
Lower step：
1. datum curve is chosen：To new battery core with certain multiplying power charge/discharge cycle, treat that battery core charge/discharge capacity is stable
Afterwards, choose curve on the basis of a charging curve therein.
2. selected characteristic is interval：The charging initial stage is chosen, one section of curve is characterized curve to change in voltage faster in front and back.As schemed
8th, shown in 9.Fig. 8 is the curve to be moved and datum curve schematic diagram before translation.Fig. 9 is the curve to be moved and benchmark after translation
Curve synoptic diagram.
3. a plurality of cyclic curve is translated, make the characteristic curve section of every curve overlap with datum curve.
4. translational movement of the different curves in Y direction relative datum curve is counted.
5., according to different cyclic curve translational movements and capacity, capacity-translational movement curve is set up in fitting.Figure 10 is translational movement
With battery core capacity matched curve schematic diagram.Pass of the table 5 for the corresponding battery core actual capacity of different cycle-indexes, SOH and translational movement
It is table.In table 5, data are used for setting up the data summarization used with battery core capacity relationship by translational movement, and SOH is actual value.
Table 5
| Cycle-index | Actual capacity | SOH | Y-axis translational movement/V |
| 2 | 84.223 | 97.93% | 0 |
| 10 | 84.264 | 97.98% | 0.003 |
| 20 | 83.75 | 97.38% | 0.003 |
| 300 | 80.985 | 94.17% | -0.001 |
| 1000 | 77.375 | 89.97% | -0.007 |
| 1500 | 75.466 | 87.75% | -0.005 |
| 2000 | 73.616 | 85.60% | -0.01 |
| 2500 | 71.806 | 83.50% | -0.016 |
6. matched curve Cap=773.86Ax+81.885 is obtained, and wherein Cap is battery core estimated capacity, and A is that Y-axis is translated
Amount.
7. pair battery core difference cyclic curve carries out curvilinear translation, estimated capacity and SOH according to above-mentioned 2～4 step.Estimation knot
Fruit such as table 6.Table 6 be after translational movement and battery core capacity relationship is set up, for verifying the data summarization of matched curve accuracy, its
Real SOH is listed in middle table with estimation SOH.
Table 6
| Cycle-index | Actual capacity | SOH | Y-axis translational movement/V |
| 2 | 84.223 | 97.93% | 0 |
| 10 | 84.264 | 97.98% | 0.003 |
| 20 | 83.75 | 97.38% | 0.003 |
| 300 | 80.985 | 94.17% | -0.001 |
| 1000 | 77.375 | 89.97% | -0.007 |
| 1500 | 75.466 | 87.75% | -0.005 |
| 2000 | 73.616 | 85.60% | -0.01 |
| 2500 | 71.806 | 83.50% | -0.016 |
4) battery core species：Just extremely lithium iron phosphate positive material, structural formula is LiFePO4, write a Chinese character in simplified form LFP, square aluminum hull, volume
Constant volume 86Ah.
1. datum curve is chosen：To new battery core with certain multiplying power charge/discharge cycle, treat that battery core charge/discharge capacity is stable
Afterwards, choose curve on the basis of a charging curve therein.
2. selected characteristic is interval：The just mid-term that charges is chosen, one section of curve is characterized curve to change in voltage faster in front and back.Such as
Figure 11, shown in 12.Figure 11 is the curve to be moved and datum curve schematic diagram before translation.Figure 12 is the curve to be moved after translation
With datum curve schematic diagram.
3. a plurality of cyclic curve is translated, make the characteristic curve section of every curve overlap with datum curve.
4. translational movement of the different curves in Y direction relative datum curve is counted.
5., according to different cyclic curve translational movements and capacity, capacity-translational movement curve is set up in fitting.Figure 13 is translational movement
With battery core capacity matched curve schematic diagram.Pass of the table 7 for the corresponding battery core actual capacity of different cycle-indexes, SOH and translational movement
It is table.In table 7, data are used for setting up the data summarization used with battery core capacity relationship by translational movement, and SOH is actual value.
Table 7
6. matched curve Cap=758.11A+82.971 is obtained, and wherein Cap is battery core estimated capacity, and A is Y-axis translational movement.
7. pair battery core difference cyclic curve carries out curvilinear translation, estimated capacity and SOH according to above-mentioned 2～4 step.Estimation knot
Fruit such as table 8.Table 8 be after translational movement and battery core capacity relationship is set up, for verifying the data summarization of matched curve accuracy, its
Real SOH is listed in middle table with estimation SOH.
Table 8
| Cycle-index | Y-axis translational movement/V | Actual capacity | SOH | Estimated capacity | Estimation SOH | Error |
| 2600 | -0.015 | 71.472 | 83.11% | 71.54 | 83.2% | 0.1% |
| 2700 | -0.015 | 71.157 | 82.74% | 71.54 | 83.2% | 0.5% |
| 2800 | -0.016 | 70.783 | 82.31% | 70.78 | 82.3% | 0.0% |
| 2900 | -0.016 | 70.391 | 81.85% | 70.78 | 82.3% | 0.6% |
Figure 14 gives a kind of schematic knot in line computation battery core capacity and the system of SOH provided in an embodiment of the present invention
Structure block diagram.As shown in figure 14, a kind of system in line computation battery core capacity and SOH, including：Datum curve sets up module, is used for
Datum curve is set up according to the charge/discharge situation of new battery core；Corresponding relation building module, for setting up different capabilities battery core
The corresponding relation of translational movement and battery core capacity between charge/discharge curve and datum curve, wherein different capabilities battery core are new with described
The positive electrode species of battery core is identical；Battery core capacity calculation module, for obtaining the charge/discharge curve and base of capacity battery core to be measured
Translational movement between directrix curve, calculates the corresponding battery core of the translational movement according to the translational movement and the corresponding relation of battery core capacity and holds
Amount.
In this embodiment, the datum curve is set up module and is followed for carrying out charge/discharge with default multiplying power to new battery core
Ring, after new battery core charge/discharge capacity is stable, chooses curve on the basis of wherein one charge/discharge curve.
In this embodiment, corresponding relation building module includes：First translation unit, for by the electricity with different capabilities
Core charge/discharge curve is translated along preset coordinate axle, makes the characteristic curve of the battery core charge/discharge curve and the feature of datum curve
Curve co-insides；Corresponding relation sets up unit, for counting the translation of the battery core charge/discharge curve along preset coordinate axle of different capabilities
Amount, sets up the corresponding relation of the translational movement and battery core capacity.In this embodiment, the translational movement is set up with battery core capacity
Corresponding relation is the matched curve for setting up translational movement and battery core capacity.
In this embodiment, the battery core capacity calculation module includes：First translation unit, for by capacity battery core to be measured
Charge/discharge curve along preset coordinate axle translate, make the characteristic curve of the charge/discharge curve and the characteristic curve of datum curve
Overlap；Capacity calculating unit, for obtaining translational movement of the charge/discharge curve along preset coordinate axle, according to the translational movement
Battery core capacity corresponding with the corresponding relation of the battery core capacity calculating translational movement.
In this embodiment, the default characteristic interval is characteristic interval of the voltage change ratio more than preset value.
Alternatively, as one embodiment of the invention, a kind of system in line computation battery core capacity and SOH, including：Benchmark
Curve sets up module, sets up datum curve for the charge/discharge situation according to new battery core；Corresponding relation building module, for building
The corresponding relation of translational movement and battery core capacity between the charge/discharge curve and datum curve of vertical different capabilities battery core, wherein different
Capacity battery core is identical with the positive electrode species of the new battery core；Battery core capacity calculation module, for obtaining capacity battery core to be measured
Charge/discharge curve and datum curve between translational movement, according to the corresponding relation of the translational movement and battery core capacity is calculated
The corresponding battery core capacity of translational movement；SOH computing modules, for the ratio of battery core capacity and nominal capacity according to capacity battery core to be measured
Value calculates SOH.
The embodiment of the present invention also provides a kind of electric vehicle, including a kind of system in line computation battery core capacity and SOH.
The system of line computation battery core capacity and SOH, including：Datum curve sets up module, builds for the charge/discharge situation according to new battery core
Vertical datum curve；Corresponding relation building module, it is flat between the charge/discharge curve and datum curve of different capabilities battery core for setting up
The corresponding relation of shifting amount and battery core capacity, wherein different capabilities battery core are identical with the positive electrode species of the new battery core；Battery core
Capacity calculation module, for obtaining the translational movement between the charge/discharge curve and datum curve of capacity battery core to be measured, according to described flat
Shifting amount battery core capacity corresponding with the corresponding relation of the battery core capacity calculating translational movement.SOH computing modules, for according to be measured
The battery core capacity and ratio calculation SOH of nominal capacity of capacity battery core.
Those skilled in the art can be understood that, for convenience of description and succinctly, the dress of foregoing description
The specific work process with unit is put, the corresponding process in preceding method embodiment is may be referred to, be will not be described here.
In several embodiments provided herein, it should be understood that disclosed apparatus and method, which can be passed through
Its mode is realized.For example, device embodiment described above is only schematic, and for example, the division of unit is only
A kind of division of logic function, can have when actually realizing other dividing mode, such as multiple units or component can with reference to or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.
As the unit of separating component explanation can be or may not be physically separate, show as unit
Part can be or may not be physical location, you can local to be located at one, or can also be distributed to multiple networks
On unit.Some or all of unit therein can be selected according to the actual needs to realize the mesh of embodiment of the present invention scheme
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, or two or more units are integrated in a unit.It is above-mentioned integrated
Unit both can be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If integrated unit realized using in the form of SFU software functional unit and as independent production marketing or use when, can
To be stored in a computer read/write memory medium.Based on such understanding, technical scheme substantially or
The part contributed to prior art is said, or all or part of the technical scheme can be embodied in the form of software product
Out, the computer software product is stored in a storage medium, is used so that a computer equipment including some instructions
(can be personal computer, server, or network equipment etc.) performs all or part of each embodiment method of the invention
Step.And aforesaid storage medium includes：It is USB flash disk, portable hard drive, read only memory (ROM, Read-Only Memory), random
Access memorizer (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with Jie of store program codes
Matter.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (15)
1. a kind of method in line computation battery core capacity and SOH, it is characterised in that comprise the steps：
S1, sets up datum curve according to the charge/discharge situation of new battery core；
S2, sets up the corresponding relation of the translational movement between the charge/discharge curve and datum curve of different capabilities battery core and battery core capacity,
Wherein different capabilities battery core is identical with the positive electrode species of new battery core described in S1；
S3, obtains the translational movement between the charge/discharge curve and datum curve of capacity battery core to be measured, according to the translational movement and battery core
The corresponding relation of capacity calculates the corresponding battery core capacity of the translational movement.
2. the method in line computation battery core capacity and SOH according to claim 1, it is characterised in that S1 includes：To new electricity
Core carries out charge/discharge cycle with default multiplying power, after new battery core charge/discharge capacity is stable, chooses wherein one charge/discharge curve
On the basis of curve.
3. the method in line computation battery core capacity and SOH according to claim 1, it is characterised in that S2 includes：
Battery core charge/discharge curve with different capabilities is translated along preset coordinate axle, the spy of the battery core charge/discharge curve is made
Levy curve to overlap with the characteristic curve of datum curve；
Translational movement of the battery core charge/discharge curve of statistics different capabilities along preset coordinate axle, is set up the translational movement and is held with battery core
The corresponding relation of amount；
Wherein, the characteristic curve be on curve on the curve of default characteristic interval chosen.
4. the method in line computation battery core capacity and SOH according to claim 3, it is characterised in that set up the translation
Amount is the matched curve for setting up translational movement and battery core capacity with the corresponding relation of battery core capacity.
5. the method in line computation battery core capacity and SOH according to claim 3 or 4, it is characterised in that S3 includes：
The charge/discharge curve of capacity battery core to be measured is translated along preset coordinate axle, make the characteristic curve of the charge/discharge curve with
The characteristic curve of datum curve overlaps；
Translational movement of the charge/discharge curve along preset coordinate axle is obtained, according to translational movement pass corresponding with battery core capacity
System calculates the corresponding battery core capacity of the translational movement；
Wherein, the characteristic curve be on curve on the curve of default characteristic interval chosen.
6. the method in line computation battery core capacity and SOH according to claim 5, it is characterised in that the default feature
The interval characteristic interval for being more than preset value for voltage change ratio.
7. the method in line computation battery core capacity and SOH according to any one of Claims 1-4, it is characterised in that also wrap
Include ratio calculation SOH of the battery core capacity and nominal capacity according to capacity battery core to be measured.
8. a kind of system in line computation battery core capacity and SOH, it is characterised in that include：
Datum curve sets up module, sets up datum curve for the charge/discharge situation according to new battery core；
Corresponding relation building module, for set up the translational movement between the charge/discharge curve and datum curve of different capabilities battery core with
The corresponding relation of battery core capacity, wherein different capabilities battery core are identical with the positive electrode species of the new battery core；
Battery core capacity calculation module, for obtaining the translational movement between the charge/discharge curve and datum curve of capacity battery core to be measured, root
The corresponding battery core capacity of the translational movement is calculated according to the translational movement and the corresponding relation of battery core capacity.
9. the system in line computation battery core capacity and SOH according to claim 8, it is characterised in that the datum curve
Module is set up for carrying out charge/discharge cycle with default multiplying power to new battery core, after new battery core charge/discharge capacity is stable, is chosen
Curve on the basis of wherein one charge/discharge curve.
10. the system in line computation battery core capacity and SOH according to claim 8, it is characterised in that the corresponding relation
Setting up module includes：
First translation unit, for the battery core charge/discharge curve with different capabilities is translated along preset coordinate axle, makes the electricity
The characteristic curve of core charge/discharge curve is overlapped with the characteristic curve of datum curve；
Corresponding relation sets up unit, for counting the battery core charge/discharge curve of different capabilities along the translational movement of preset coordinate axle, builds
Found the corresponding relation of the translational movement and battery core capacity.
11. systems in line computation battery core capacity and SOH according to claim 10, it is characterised in that set up described flat
Shifting amount is the matched curve for setting up translational movement and battery core capacity with the corresponding relation of battery core capacity.
12. systems in line computation battery core capacity and SOH according to claim 10 or 11, it is characterised in that the electricity
Core capacity calculation module includes：
First translation unit, for the charge/discharge curve of capacity battery core to be measured is translated along preset coordinate axle, makes the discharge charge
The characteristic curve of electric curve is overlapped with the characteristic curve of datum curve；
Capacity calculating unit, for obtaining translational movement of the charge/discharge curve along preset coordinate axle, according to the translational movement with
The corresponding relation of battery core capacity calculates the corresponding battery core capacity of the translational movement.
13. systems in line computation battery core capacity and SOH according to claim 12, it is characterised in that the default spy
Levy the interval characteristic interval for being more than preset value for voltage change ratio.
14. systems in line computation battery core capacity and SOH according to any one of claim 8 to 11, it is characterised in that also
Including SOH computing modules, for ratio calculation SOH of battery core capacity and nominal capacity according to capacity battery core to be measured.
A kind of 15. electric vehicles, including the system in line computation battery core capacity and SOH described in any one of claim 8 to 14.
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