CN109507611A - A kind of the SOH modification method and system of electric car - Google Patents
A kind of the SOH modification method and system of electric car Download PDFInfo
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Abstract
The present invention provides the SOH modification method and system of a kind of electric car, this method comprises: obtaining the corresponding relationship between the open-circuit voltage OCV of power cell of vehicle and the SOC of power battery by test, and the OCV-SOC for establishing power battery corresponds to table.When carrying out charge and discharge after power battery is full of with trickle charge charging modes, battery accumulated discharge capacity C is obtained1With accumulative charging capacity C2.Before the electricity of power battery next time is full of, judge whether power battery meets the condition using open-circuit voltage OCV amendment power battery SOC.If it is, obtaining the open-circuit voltage OCV of power battery, table is corresponded to by the OCV-SOC and tables look-up to obtain corresponding SOCOCVCorrection value, and according to SOCOCVCorrection value is modified power battery SOH.The present invention can improve the safety and intelligence that electric car uses.
Description
Technical field
The present invention relates to the SOH modification method of batteries of electric automobile technical field more particularly to a kind of electric car and it is
System.
Background technique
As the power battery of electric car is in use with the continuous decaying of capacity, the difference of battery with two side terminals
Different to become larger, pure electric automobile battery pack SOH value is also constantly decaying.In electric vehicle driving process, it is desirable to be able to right
The health status (SOH) of battery pack is estimated, also remains that how many capacity can be used effectively to evaluate battery pack.If SOH is quasi-
Exactness is not high, will cause the inaccuracy of the state-of-charge (SOC) of battery, the estimation error of SOC is larger, may cause electric car
Halfway is forced to stop because of not enough power supply.
The SOH evaluation method that mainstream uses currently on the market is Life Cycle method (calendar life+cycle life), that is, is passed through
Read battery using time and accumulative charge and discharge ampere-hour, correspond to SOH value table to search cycle life (battery producer pass through structure
Established model simulated battery is run under certain operating condition, the table of production), obtain the SOH value of power battery.The method is easy to operate, but
In use due to power battery, actual operating mode is multifarious, most larger with simulation operating condition difference, so method exists
Error is larger in application process.
Summary of the invention
The present invention provides the SOH modification method and system of a kind of electric car, solves the SOH estimated value of existing electric car
The problem of inaccuracy, can improve the safety and intelligence that electric car uses.
In order to achieve the above object, the present invention the following technical schemes are provided:
A kind of SOH modification method of electric car, comprising:
The corresponding relationship between SOC by testing the open-circuit voltage OCV and power battery that obtain power cell of vehicle, and
The OCV-SOC for establishing power battery corresponds to table；
When carrying out charge and discharge after power battery is full of with trickle charge charging modes, battery accumulated discharge capacity C is obtained1With it is tired
Count charging capacity C2；
Before the electricity of power battery next time is full of, judges whether power battery meets and corrected using open-circuit voltage OCV
The condition of power battery SOC；
If it is, obtain power battery open-circuit voltage OCV, by the OCV-SOC correspond to table table look-up to obtain it is corresponding
SOCOCVCorrection value, and according to SOCOCVCorrection value is modified power battery SOH.
Preferably, further includes:
If it is not, then after vehicle electricity is vented completely, according to the battery accumulated discharge capacity C1Add up to fill with described
Capacitance C2The SOH of power battery is calculated.
Preferably, described according to SOCOCVCorrection value is modified power battery SOH, comprising:
According to formula:Calculation obtains the actual capacity C of power batteryS；
Obtain the rated capacity C of power batterye, and according to formula:Obtain SOH calculated value；
It is modified using the SOH calculated value as power battery SOH.
Preferably, described according to the battery accumulated discharge capacity C1With the accumulative charging capacity C2Power is calculated
The SOH of battery, comprising:
According to formula: CS=C1-C2, the actual capacity C of power battery is calculatedS；
And using the actual capacity of power battery and the ratio of rated capacity as power battery SOH correction value.
Preferably, judge whether power battery meets includes: using the condition of open-circuit voltage OCV amendment power battery SOC
Whether the power battery of vehicle keeps static condition to be greater than and is equal to 1h, if it is, by the battery cell of acquisition
Open-circuit voltage OCV of the minimum voltage as power battery.
The present invention also provides a kind of SOH update the systems of electric car, comprising:
Setting unit, for being obtained by test between the open-circuit voltage OCV of power cell of vehicle and the SOC of power battery
Corresponding relationship, and the OCV-SOC for establishing power battery corresponds to table；
Acquiring unit, for it is accumulative to obtain battery when carrying out charge and discharge after power battery is full of with trickle charge charging modes
Discharge capacity C1With accumulative charging capacity C2；
Judging unit is opened for before the electricity of power battery next time is full of, judging whether power battery meets to use
The condition of road voltage OCV amendment power battery SOC；
First amending unit, for meeting the condition using open-circuit voltage OCV amendment power battery SOC in power battery
When, the open-circuit voltage OCV of power battery is obtained, table is corresponded to by the OCV-SOC and tables look-up to obtain corresponding SOCOCVCorrection value, and
According to SOCOCVCorrection value is modified power battery SOH.
Preferably, further includes:
Second amending unit, for being unsatisfactory for the item using open-circuit voltage OCV amendment power battery SOC in power battery
Part, and after vehicle electricity is vented completely, according to the battery accumulated discharge capacity C1With the accumulative charging capacity C2It calculates
To the SOH of power battery.
Preferably, first amending unit includes:
First battery capacity calculates unit, for according to formula:Calculation obtains power battery
Actual capacity CS；
First SOH computing unit, for obtaining the rated capacity C of power batterye, and according to formula:SOH calculated value is obtained, and then is modified using the SOH calculated value as power battery SOH.
Preferably, the second amending unit includes:
Second battery capacity calculates unit, for according to formula: CS=C1-C2, the actual capacity of power battery is calculated
CS；
2nd SOH computing unit, for using the ratio of the actual capacity of power battery and rated capacity as power battery
SOH correction value.
Preferably, judging unit includes:
Judging unit is stood, for judging whether the power battery holding static condition of vehicle is greater than and is equal to 1h, if
It is, then using the minimum voltage of the battery cell of acquisition as the open-circuit voltage OCV of power battery.
The present invention provides the SOH modification method and system of a kind of electric car, corresponds to table using setting OCV-SOC, and
The SOC value of power battery is corrected when eligible by OCV, and then power battery SOH is modified.Solve existing electronic vapour
The problem of the SOH estimated value inaccuracy of vehicle, can improve the safety and intelligence that electric car uses.
Detailed description of the invention
In order to illustrate more clearly of specific embodiments of the present invention, attached drawing needed in the embodiment will be made below
Simply introduce.
Fig. 1: being a kind of SOH modification method flow chart of electric car provided by the invention.
Specific embodiment
The scheme of embodiment in order to enable those skilled in the art to better understand the present invention with reference to the accompanying drawing and is implemented
Mode is described in further detail the embodiment of the present invention.
There is a problem of power battery SOH valuation inaccuracy for current electric car, the present invention provides a kind of electronic vapour
The SOH modification method and system of vehicle correspond to table using setting OCV-SOC, and correct power battery by OCV when eligible
SOC value, and then power battery SOH is modified.Solve the problems, such as the SOH estimated value inaccuracy of existing electric car, energy
Improve safety and intelligence that electric car uses.
As shown in Figure 1, a kind of SOH modification method of electric car, comprising:
S1: the corresponding pass between the open-circuit voltage OCV of power cell of vehicle and the SOC of power battery is obtained by testing
System, and the OCV-SOC for establishing power battery corresponds to table；
S2: when carrying out charge and discharge after power battery is full of with trickle charge charging modes, battery accumulated discharge capacity C is obtained1
With accumulative charging capacity C2；
S3: before the electricity of power battery next time is full of, judges whether power battery meets and repaired using open-circuit voltage OCV
The condition of ahead power battery SOC；
S4: it if it is, obtain the open-circuit voltage OCV of power battery, table is corresponded to by the OCV-SOC tables look-up and corresponded to
SOCOCVCorrection value, and according to SOCOCVCorrection value is modified power battery SOH.
In practical applications, the different operating statuses of different batteries, same battery, can be by statistics battery at the moment
Actual discharge capacity, to calculate the true SOH value of battery at this time.And with the gradually decaying of battery, SOC is corrected according to OCV
Value corrects the SOH of power battery, improves its precision.
This method further include:
S5: if it is not, then after vehicle electricity is vented completely, according to the battery accumulated discharge capacity C1Add up with described
Charging capacity C2The SOH of power battery is calculated.
Further, described according to SOCOCVCorrection value is modified power battery SOH, comprising:
According to formula:Calculation obtains the actual capacity C of power batteryS；
Obtain the rated capacity C of power batterye, and according to formula:Obtain SOH calculated value；
It is modified using the SOH calculated value as power battery SOH.
In practical applications, it is illustrated by taking certain model ternary battery pure electric sedan as an example.After vehicle is full of, three are carried out
Secondary electric discharge operating condition, charge operating condition twice, rear that OCV amendment occurs, and corrects the SOC correction value SOC at momentOCV=18%, battery is accumulative
Discharge capacity C1=74.56AH adds up charging capacity C2=15.88AH, the then actual capacity of battery at this timeAnd then it is available according to formula
Further, described according to the battery accumulated discharge capacity C1With the accumulative charging capacity C2It is calculated dynamic
The SOH of power battery, comprising: according to formula: CS=C1-C2, the actual capacity C of power battery is calculatedS；And by power battery
Actual capacity and rated capacity ratio as power battery SOH correction value.
In practical applications, it is illustrated by taking certain model lithium iron battery pure electric sedan as an example.After vehicle is full of from trickle charge,
OCV amendment does not occur always, until vehicle electricity is vented completely, counts battery accumulated discharge capacity C1=64.37AH, it is accumulative to fill
Capacitance C2=7.68AH；It can be calculated according to formula: CS=C2-C1=64.37-7.68=56.69AH,
Judging whether power battery meets using the condition of open-circuit voltage OCV amendment power battery SOC includes: the dynamic of vehicle
Whether power battery keeps static condition to be greater than and is equal to 1h, if it is, using the minimum voltage of the battery cell of acquisition as dynamic
The open-circuit voltage OCV of power battery.
Specifically, according to the electrochemical properties of battery, state-of-charge SOC value and its open-circuit voltage OCV of battery have specific
Corresponding relationship, therefore can obtain its accurate SOC value by measuring the OCV of battery；OCV value generally takes battery to keep quiet
Battery cell least significant end voltage after the state of setting >=1h corresponds in practical client's operational process, after even electricity is more than 1h under parking, vehicle
The moment powered on again collected monomer voltage minimum, as the OCV value of battery；According to this value by tabling look-up and can obtain
The modified accurate SOC value SOC of OCVOCV。
As it can be seen that the present invention provides a kind of SOH modification method of electric car, setting OCV-SOC corresponds to table, and is meeting item
The SOC value of power battery is corrected when part by OCV, and then power battery SOH is modified.Solve existing electric car
The problem of SOH estimated value inaccuracy, can improve the safety and intelligence that electric car uses.
The present invention also provides a kind of SOH update the systems of electric car, comprising: setting unit, for being obtained by test
Corresponding relationship between the open-circuit voltage OCV of power cell of vehicle and the SOC of power battery, and establish the OCV- of power battery
SOC corresponds to table.Acquiring unit, for it is tired to obtain battery when carrying out charge and discharge after power battery is full of with trickle charge charging modes
Count discharge capacity C1With accumulative charging capacity C2.Judging unit, for before the electricity of power battery next time is full of, judgement to be dynamic
Whether power battery meets the condition using open-circuit voltage OCV amendment power battery SOC.First amending unit, in power electric
When pond meets the condition using open-circuit voltage OCV amendment power battery SOC, the open-circuit voltage OCV of power battery is obtained, by described
OCV-SOC corresponds to table and tables look-up to obtain corresponding SOCOCVCorrection value, and according to SOCOCVCorrection value repairs power battery SOH
Just.
The system further include: the second amending unit corrects power using open-circuit voltage OCV for being unsatisfactory in power battery
The condition of battery SOC, and after vehicle electricity is vented completely, according to the battery accumulated discharge capacity C1With the accumulative charging
Capacity C2The SOH of power battery is calculated.
Further, first amending unit includes: that the first battery capacity calculates unit, for according to formula:Calculation obtains the actual capacity C of power batteryS.First SOH computing unit, for obtaining power electric
The rated capacity C in ponde, and according to formula:SOH calculated value is obtained, and then the SOH calculated value is made
It is modified for power battery SOH.
Further, the second amending unit includes: that the second battery capacity calculates unit, for according to formula: CS=C1-C2,
The actual capacity C of power battery is calculatedS.2nd SOH computing unit, for by the actual capacity of power battery and specified appearance
The ratio of amount is as power battery SOH correction value.
Judging unit includes: standing judging unit, for judging that the power battery of vehicle keeps whether static condition is greater than
And it is equal to 1h, if it is, using the minimum voltage of the battery cell of acquisition as the open-circuit voltage OCV of power battery.
As it can be seen that the present invention provides the SOH modification method and system of a kind of electric car, OCV- is established using setting unit
SOC corresponds to table, and corrects the SOC value of power battery by OCV when eligible, and then be modified to power battery SOH.
The SOH estimated value inaccuracy for solving the problems, such as existing electric car, can improve the safety and intelligence that electric car uses.
Structure, feature and effect of the invention, the above institute is described in detail according to diagrammatically shown embodiment above
Only presently preferred embodiments of the present invention is stated, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to structure of the invention
Think made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (10)
1. a kind of SOH modification method of electric car characterized by comprising
The corresponding relationship between SOC by testing the open-circuit voltage OCV and power battery that obtain power cell of vehicle, and establish
The OCV-SOC of power battery corresponds to table；
When carrying out charge and discharge after power battery is full of with trickle charge charging modes, battery accumulated discharge capacity C is obtained1It is filled with accumulative
Capacitance C2；
Before the electricity of power battery next time is full of, judges whether power battery meets and power is corrected using open-circuit voltage OCV
The condition of battery SOC；
If it is, obtaining the open-circuit voltage OCV of power battery, table is corresponded to by the OCV-SOC and tables look-up to obtain corresponding SOCOCV
Correction value, and according to SOCOCVCorrection value is modified power battery SOH.
2. the SOH modification method of electric car according to claim 1, which is characterized in that further include:
If it is not, then after vehicle electricity is vented completely, according to the battery accumulated discharge capacity C1With the accumulative charging capacity
C2The SOH of power battery is calculated.
3. according to the SOH modification method for the electric car that claim 2 is stated, which is characterized in that described according to SOCOCVCorrection value pair
Power battery SOH is modified, comprising:
According to formula:Calculation obtains the actual capacity C of power batteryS；
Obtain the rated capacity C of power batterye, and according to formula:Obtain SOH calculated value；
It is modified using the SOH calculated value as power battery SOH.
4. according to the SOH modification method for the electric car that claim 3 is stated, which is characterized in that described accumulative according to the battery
Discharge capacity C1With the accumulative charging capacity C2The SOH of power battery is calculated, comprising:
According to formula: CS=C1-C2, the actual capacity C of power battery is calculatedS；
And using the actual capacity of power battery and the ratio of rated capacity as power battery SOH correction value.
5. the SOH modification method for the electric car stated according to claim 1, which is characterized in that judge whether power battery meets
Include: using the condition that open-circuit voltage OCV corrects power battery SOC
Whether the power battery of vehicle keeps static condition to be greater than and is equal to 1h, if it is, most by the battery cell of acquisition
Open-circuit voltage OCV of the low-voltage as power battery.
6. a kind of SOH update the system of electric car characterized by comprising
Setting unit, for obtaining pair between the open-circuit voltage OCV of power cell of vehicle and the SOC of power battery by test
It should be related to, and the OCV-SOC for establishing power battery corresponds to table；
Acquiring unit, for obtaining battery accumulated discharge when carrying out charge and discharge after power battery is full of with trickle charge charging modes
Capacity C1With accumulative charging capacity C2；
Judging unit, for before the electricity of power battery next time is full of, judging whether power battery meets using open circuit electricity
Press the condition of OCV amendment power battery SOC；
First amending unit obtains when for meeting the condition using open-circuit voltage OCV amendment power battery SOC in power battery
The open-circuit voltage OCV for taking power battery corresponds to table by the OCV-SOC and tables look-up to obtain corresponding SOCOCVCorrection value, and according to
SOCOCVCorrection value is modified power battery SOH.
7. the SOH update the system of electric car according to claim 6, which is characterized in that further include:
Second amending unit, for being unsatisfactory for the condition using open-circuit voltage OCV amendment power battery SOC in power battery, and
After vehicle electricity is vented completely, according to the battery accumulated discharge capacity C1With the accumulative charging capacity C2It is calculated dynamic
The SOH of power battery.
8. according to the SOH modification method for the electric car that claim 7 is stated, which is characterized in that first amending unit includes:
First battery capacity calculates unit, for according to formula:Calculation obtains the reality of power battery
Capacity CS；
First SOH computing unit, for obtaining the rated capacity C of power batterye, and according to formula:?
It is modified to SOH calculated value, and then using the SOH calculated value as power battery SOH.
9. according to the SOH update the system for the electric car that claim 8 is stated, which is characterized in that the second amending unit includes:
Second battery capacity calculates unit, for according to formula: CS=C1-C2, the actual capacity C of power battery is calculatedS；
2nd SOH computing unit, for being repaired the ratio of the actual capacity of power battery and rated capacity as power battery SOH
Positive value.
10. according to the SOH modification method for the electric car that claim 6 is stated, which is characterized in that judging unit includes:
Judging unit is stood, for judging whether the power battery holding static condition of vehicle is greater than and is equal to 1h, if it is,
Using the minimum voltage of the battery cell of acquisition as the open-circuit voltage OCV of power battery.
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