CN107247241B - For estimating the device of battery SOC - Google Patents
For estimating the device of battery SOC Download PDFInfo
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- CN107247241B CN107247241B CN201710477848.7A CN201710477848A CN107247241B CN 107247241 B CN107247241 B CN 107247241B CN 201710477848 A CN201710477848 A CN 201710477848A CN 107247241 B CN107247241 B CN 107247241B
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- 238000000034 method Methods 0.000 description 45
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 14
- 229910052744 lithium Inorganic materials 0.000 description 14
- 230000005611 electricity Effects 0.000 description 13
- 230000010354 integration Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
Classifications
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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
-
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to technical field of battery management, disclose a kind of for estimating the device of battery SOC, which includes processor, and the processor is configured to: judging whether battery enters charging end；In the case where judging that battery enters charging end, according to the corresponding relationship of the voltage V of the battery under the electric current I of the battery detected, the voltage V of battery and the different multiplying that prestores, electric current I and SOC value, the SOC value of the battery is estimated.The precision for the SOC value estimated through the device has obtained large increase, prevents from causing to damage to battery due to overcharging.
Description
Technical field
The present invention relates to technical field of battery management, and in particular, to for estimating the device of battery SOC.
Background technique
Lithium battery is widely used in electric car, energy storage and standby because of advantages such as its energy density height, good environmental protections
With fields such as power supplys.State-of-charge (State-of-Charge, SOC) is one of key parameter of lithium battery, and SOC embodies electricity
The remaining capacity of pond group is the direct parameter that user assesses current electric car course continuation mileage, the backup power source remaining working time.
Current battery management system (Battery Management System, BMS) is mainly using current integration method to electricity
The SOC of pond group estimated, and open-circuit voltage when being aided with standing is corrected.But this mode has certain defect, mainly
When being that lithium battery is in charging end, to battery SOC estimation, there are large errors.If SOC estimation is less than normal, it is easy to cause electricity
Pond overcharges, and seriously damages battery, reduces battery；If SOC estimation is bigger than normal, user can be caused to mislead, driven
It is not completely filled with the electric car trip of electricity, causes the serious consequences such as " sitting " on the way.
Summary of the invention
The object of the present invention is to provide a kind of for estimating the device of battery SOC, and the device is based on the electricity under different multiplying
Voltage V, the electric current I in pond and the corresponding relationship of SOC value estimate battery SOC, improve the accuracy of SOC estimation.
To achieve the goals above, embodiments of the present invention provide a kind of for estimating the device of battery SOC, the device
Including processor, the processor is configured to:
Judge whether battery enters charging end；
Judge battery enter charging end in the case where, according to the electric current of the battery detected, battery voltage and
The corresponding relationship of the voltage of battery under the different multiplying prestored, electric current and SOC value, estimates the SOC value of the battery.
Preferably, the processor is configured to:
The SOC value of battery of estimation is compared with a threshold value；
If the SOC value of estimation is greater than the threshold value, judge that battery enters charging end.
Preferably, the threshold value is 85%.
Preferably, the processor is configured to:
In the case where judging that battery enters charging end, according to the voltage, electric current and SOC value of the battery under different multiplying
Corresponding relationship, determine in the corresponding relationship under different multiplying with current voltage value V1Corresponding multiple current values；
The present current value I with the battery detected is determined from multiple current valuesxTwo adjacent current value I1And I2,
Wherein present current value IxPositioned at the two current values I1And I2Between；
The SOC value of battery is estimated according to formula (1):
I.e.
Wherein, SOCxSOC value for the battery estimated, IxFor the present current value detected, I1And I2It is respectively corresponding
In relationship with current voltage V1In corresponding current value with IxTwo adjacent current values, SOC1And SOC2Respectively and I1And I2It is right
The SOC value answered.
Preferably, the device further include:
The voltage sensor being connected to the processor, for detecting the voltage of battery；
The current sensor being connected to the processor, for detecting the electric current of battery.
Preferably, which further includes the memory being connected to the processor, and the memory is configured to store institute
State corresponding relationship.
Preferably, which further includes the display being connected to the processor, and the display is display configured to electricity
The SOC value in pond.
Preferably, the corresponding relationship of the voltage V of the battery under the different multiplying, electric current I and SOC value is under different multiplying
Battery charging curve.
Through the above technical solutions, realizing the SOC estimation to battery, the accuracy of SOC estimation is improved.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of the method for estimating battery SOC according to an embodiment of the present invention；
Fig. 2 is the flow chart of the method for estimating battery SOC according to an embodiment of the present invention；
Fig. 3 is the flow chart of the method for estimating battery SOC according to an embodiment of the present invention；
Fig. 4 is the flow chart of the method for estimating battery SOC according to an embodiment of the present invention；
Fig. 5 is the flow chart of the method for estimating battery SOC according to an embodiment of the present invention；
Fig. 6 is the schematic block diagram of the device for estimating battery SOC according to an embodiment of the present invention；
Fig. 7 shows the charging curve of the lithium battery under different multiplying；
Fig. 8 shows the charging terminal curve of the lithium battery under different multiplying；
Fig. 9 shows the discharge curve of the lithium battery under different multiplying；And
Figure 10 shows the electric discharge terminal curve of the lithium battery under different multiplying.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The term " charging end " used in this application refers to the rank in the charging process of battery close to charging complete
Section, term " electric discharge end " refer to the stage completed in the discharge process of battery close to electric discharge.
Fig. 1 is the flow chart of the method for estimating battery SOC according to an embodiment of the present invention.As shown in Figure 1,
In one embodiment of the present invention, it provides a kind of for estimating that the method for battery SOC, this method may include:
In step s 11, judge whether battery enters charging end；
In step s 12, in the case where judging that battery enters charging end, according to the electric current of the battery detected
I, the corresponding relationship of the voltage V of the voltage V of the battery and the battery under the different multiplying prestored, electric current I and SOC value, estimates
Count the SOC value of the battery.
Battery may, for example, be lithium battery.
Above-mentioned corresponding relationship may, for example, be the charging curve (as shown in Figure 7) of the battery under different multiplying.The charging
Curve, which can be, to be predefined and stores.Such as the charging curve can store in the memory of BMS.Determine charging song
The method of line can be known to those skilled in the art.
The voltage of battery can be detected for example, by using voltage sensor.The electric current of battery can be for example, by using current sense
Device detects.Alternatively, the voltage and current of battery can for example pass through battery management system (Battery Management
System, BMS) it detects.
Whether entrance charging end may include the SOC value of battery and a threshold that will be estimated to the battery that judges in step s 11
Value is compared, if the SOC value of estimation is greater than the threshold value, judges that battery enters charging end.Such as ampere-hour can be used
Integration method estimates SOC value.In an embodiment of the invention, which may, for example, be 85%, but art technology
Personnel are understood that the threshold value can select any other suitable value.
Fig. 2 is the flow chart of the method for estimating battery SOC according to an embodiment of the present invention.As shown in Fig. 2,
In one embodiment of the present invention, it provides a kind of for estimating that the method for battery SOC, this method may include:
In the step s 21, the voltage V of battery, the electric current I of battery are detected；
In step S22, the SOC value of battery is estimated；Such as the SOC value of battery can be estimated using current integration method；
In step S23, judge whether battery enters charging end；
In step s 24, in the case where judging that battery enters charging end, according to the electric current of the battery detected
I, the corresponding relationship of the voltage V of the voltage V of the battery and the battery under the different multiplying prestored, electric current I and SOC value, estimates
Count the SOC value of the battery.
With reference in embodiment shown in Fig. 2, step S23 and S24 can with reference in embodiment shown in FIG. 1
Step S11 and S12 is same or similar.
In one embodiment of the present invention, the current SOC value of the estimation battery in above-mentioned steps S12 or step S24 can
To include:
Determine in above-mentioned corresponding relationship multiple current values corresponding with current voltage value under different multiplying.For example, in this hair
In a bright embodiment, it can determine corresponding with battery current voltage value more on the charging curve of the battery under different multiplying
A current value；
Two electricity of (such as closest) adjacent with the present current value of the battery detected are determined from multiple current values
Flow valuve, wherein present current value is located between the two current values.The charging that Fig. 7 shows the lithium battery under different multiplying is bent
Line.Although the charging curve of lithium battery is shown in the figure, it will be appreciated by those skilled in the art that other kinds of battery
It is applicatory.As shown in figure 8, battery current voltage value is V1, present current value Ix, the battery charging curve of different multiplying
In two current values adjacent with present current value be respectively I1And I2, with I1And I2Corresponding SOC value is respectively SOC1And SOC2。
The SOC value of battery is estimated according to formula (1):
I.e.
Wherein, SOCxSOC value for the battery estimated, IxFor the present current value detected, I1And I2It is respectively corresponding
In relationship (such as charging curve) with current voltage V1In corresponding current value with IxTwo adjacent current values, SOC1And SOC2
Respectively and I1And I2Corresponding SOC value.
By the above method, the SOC value of battery can be modified in battery charging end, to improve SOC estimation
Precision.
Fig. 3 is the flow chart of the method for estimating battery discharge end SOC according to an embodiment of the present invention.Such as
Shown in Fig. 3, in one embodiment of the present invention, provide a kind of for estimating the method for battery discharge end SOC, this method
May include:
In step S31, judge whether battery enters electric discharge end；
In step s 32, in the case where judging that battery enters electric discharge end, according to the electric current of the battery detected
I, the corresponding relationship of the voltage V of the voltage V of the battery and the battery under the different multiplying prestored, electric current I and SOC value, estimates
Count the SOC value of the battery discharge end.
Battery may, for example, be lithium battery.
Above-mentioned corresponding relationship may, for example, be the discharge curve (as shown in Figure 9) of the battery under different multiplying.The electric discharge
Curve, which can be, to be predefined and stores.Such as the discharge curve can store in the memory of BMS.Determine electric discharge song
The method of line can be known to those skilled in the art.
The voltage of battery can be detected for example, by using voltage sensor.The electric current of battery can be for example, by using current sense
Device detects.Alternatively, the voltage and current of battery can for example pass through battery management system (Battery Management
System, BMS) it detects.
Judge in step S31 battery whether enter electric discharge end method may include the SOC value of battery that will estimate and
One threshold value is compared, if the SOC value of estimation is less than the threshold value, judges that battery enters electric discharge end.It can be using for example
Current integration method estimates SOC value.In an embodiment of the invention, which may, for example, be 15%, but this field
Technical staff is understood that the threshold value can select any other suitable value.
Fig. 4 is the flow chart of the method for estimating battery discharge end SOC according to an embodiment of the present invention.Such as
Shown in Fig. 4, in one embodiment of the present invention, provide a kind of for estimating the method for battery discharge end SOC, this method
May include:
In step S41, the voltage V of battery, the electric current I of battery are detected；
In step S42, the SOC value of battery is estimated；Such as the SOC value of battery can be estimated using current integration method；
In step S43, judge whether battery enters electric discharge end；
In step S44, in the case where judging that battery enters electric discharge end, according to the electric current of the battery detected
I, the corresponding relationship of the voltage V of the voltage V of the battery and the battery under the different multiplying prestored, electric current I and SOC value, estimates
Count the SOC value of the battery.
In embodiment shown in Fig. 4, step S43 and S44 can be with the step S31 in embodiment shown in Fig. 3
It is same or similar with S32.
In one embodiment of the present invention, the current SOC value of the estimation battery in above-mentioned steps S32 or step S44 can
To include:
Determine in above-mentioned corresponding relationship multiple current values corresponding with current voltage value under different multiplying.For example, in this hair
In a bright embodiment, it can determine corresponding with battery current voltage value more on the discharge curve of the battery under different multiplying
A current value；
Two electricity of (such as closest) adjacent with the present current value of the battery detected are determined from multiple current values
Flow valuve, wherein present current value is located between the two current values.The electric discharge that Fig. 9 shows the lithium battery under different multiplying is bent
Line.Figure 10 is the lithium battery electric discharge terminal curve under different multiplying.Although the discharge curve of lithium battery is shown in the figure, this
Field technical staff is understood that other kinds of battery is also applicatory.As shown in Figure 10, battery current voltage value is V1,
Present current value is Ix, two current values adjacent with present current value are respectively I in the battery discharge curve of different multiplying1With
I2, with I1And I2Corresponding SOC value is respectively SOC1And SOC2。
The SOC value of battery is estimated according to formula (3):
I.e.
Wherein, SOCxSOC value for the battery estimated, IxFor the present current value detected, I1And I2It is respectively corresponding
In relationship (such as discharge curve) with current voltage V1In corresponding current value with IxTwo adjacent current values, SOC1And SOC2
Respectively and I1And I2Corresponding SOC value.
It by the above method, can be modified in SOC value of the battery discharge end to battery, to improve SOC estimation
Precision.
Fig. 5 is the process of the method for estimating battery charging/discharging end SOC according to an embodiment of the present invention
Figure.As shown in figure 5, in one embodiment of the present invention, providing a kind of for estimating that the method for battery SOC, this method can
To include:
In step s 51, judge the charging and discharging state of battery；
In step S52, in the case where judging that battery is in charged state, electricity is estimated according to method shown in Fig. 1 or Fig. 2
The SOC value of pond charging end；In step S53, in the case where judging that battery is in discharge condition, according to Fig. 3 or Fig. 4
The SOC value of method estimation battery discharge end.
If it is determined that battery in charged state neither be also not in discharge condition, then this method terminates.
Fig. 6 is the schematic block diagram of the device for estimating battery SOC according to an embodiment of the present invention.The device can
For executing the method for being used to estimate battery SOC in above embodiment.Specifically, as shown in fig. 6, for estimating electricity
The device of pond SOC includes processor 10.
In an embodiment of the invention, processor 10 may be configured to:
Judge whether battery enters charging end；
In the case where judging that battery enters charging end, according to the electric current I of the battery detected, the battery
The corresponding relationship of the voltage V of voltage V and the battery under the different multiplying prestored, electric current I and SOC value, estimate the battery
SOC value.
In an embodiment of the invention, which can also include voltage sensor 20, for detecting battery
Voltage；Current sensor 30, for detecting the electric current of battery.Processor 10 is also used to estimate the SOC value of battery.For example, processing
Device 10 estimates the SOC value of battery using such as current integration method before can entering charging end judging battery.
In addition, the device can also include memory 40, it is configured to store above-mentioned corresponding relationship.The corresponding relationship is for example
It can be above-mentioned charging curve.
In another embodiment of the present invention, processor 10 may be configured to:
Judge whether battery enters electric discharge end；
In the case where judging that battery enters electric discharge end, according to the electric current I of the battery detected, the battery
The corresponding relationship of the voltage V of voltage V and the battery under the different multiplying prestored, electric current I and SOC value, estimate that the battery is put
The SOC value of electric end.
In an embodiment of the invention, processor 10 can be configured to judging that it is last that battery enters electric discharge
The SOC value of battery is estimated before end using such as current integration method.
In this embodiment, memory 40 may be configured to store above-mentioned corresponding relationship.The corresponding relationship is, for example,
Above-mentioned discharge curve.
In a further embodiment of the invention, processor 10 be may be configured to:
Judge the charging and discharging state of battery；
In the case where judging that battery is in charged state, can execute it is above-mentioned about in charging process for estimating electricity
The step of pond SOC；
In the case where judging that battery is in discharge condition, can execute it is above-mentioned about in discharge process for estimating electricity
The step of pond SOC.
In addition, processor 10 can be configured to judging that battery had both been not at charged state not also in discharge condition
In the case where, do not execute operation.
In alternatively or additionally embodiment of the invention, which can also include display 50, be display configured to
The SOC value of battery.
In an embodiment of the invention, which can be BMS.
In an embodiment of the invention, a kind of computer readable storage medium is provided, on the storage medium
It is stored with instruction, which execute the processor as shown in any in Fig. 1 to 5 for estimating electricity
The method of pond SOC.
The precision for the SOC value estimated by the above method has obtained large increase, guarantees that SOC maintains reasonable model
In enclosing, prevent from that battery is caused to damage due to overcharging, reduce battery, be also prevented from user drive take for it is fully charged
Automobile trip causes the automobile serious consequences such as " sitting " on the way.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.It is further to note that in above-mentioned specific embodiment
Described in each particular technique feature can be combined in any appropriate way in the case of no contradiction, be
Avoid unnecessary repetition, the invention will not be further described in various possible combinations.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (7)
1. a kind of for estimating the device of battery charge state SOC, which is characterized in that the device includes processor, the processing
Device is configured to:
Judge whether battery enters charging end；
In the case where judging that battery enters charging end, according to pair of the voltage of the battery under different multiplying, electric current and SOC value
Should be related to, determine in the corresponding relationship under different multiplying with current voltage value V1Corresponding multiple current values；
The present current value I with the battery detected is determined from multiple current valuesxTwo adjacent current value I1And I2, wherein
Present current value IxPositioned at the two current values I1And I2Between；
The SOC value of battery is estimated according to formula (1):
I.e.
Wherein, SOCxSOC value for the battery estimated, IxFor the present current value detected, I1And I2Respectively corresponding relationship
In with current voltage V1In corresponding current value with IxTwo adjacent current values, SOC1And SOC2Respectively and I1And I2It is corresponding
SOC value.
2. the apparatus according to claim 1, which is characterized in that the processor is configured to:
The SOC value of battery of estimation is compared with a threshold value；
If the SOC value of estimation is greater than the threshold value, judge that battery enters charging end.
3. the apparatus of claim 2, which is characterized in that the threshold value is 85%.
4. the apparatus according to claim 1, which is characterized in that the device further include:
The voltage sensor being connected to the processor, for detecting the voltage of battery；
The current sensor being connected to the processor, for detecting the electric current of battery.
5. the apparatus according to claim 1, which is characterized in that the device further includes the storage being connected to the processor
Device, the memory are configured to store the corresponding relationship.
6. the apparatus according to claim 1, which is characterized in that the device further includes the display being connected to the processor
Device, the display are display configured to the SOC value of battery.
7. the apparatus according to claim 1, which is characterized in that voltage V, the electric current I of the battery under the different multiplying with
The corresponding relationship of SOC value is the charging curve of the battery under different multiplying.
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