CN108226797B - Power battery SOP estimation method and device and vehicle with same - Google Patents
Power battery SOP estimation method and device and vehicle with same Download PDFInfo
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Abstract
The invention discloses a power battery SOP estimation method, a power battery SOP estimation device and a vehicle with the power battery SOP estimation device, wherein the method comprises the following steps: obtaining an initial SOP value according to the SOP data table; obtaining a current correction value according to the working current of the power battery and the corresponding battery voltage; and correcting the initial SOP value according to the current correction value to obtain the current SOP value of the power battery. According to the method, the SOP can be calculated and corrected in real time by collecting the current of the power battery and the battery voltage under different currents, so that the reliability of system control is effectively improved, and the cycle life of the power battery system is prolonged.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a power battery SOP estimation method and device and a vehicle with the same.
Background
The battery module is used as a power energy storage device of the electric automobile, the discharging capacity under different working conditions determines the driving performance of the electric automobile, and the utilization efficiency of the battery can be improved to the maximum extent through the accurate estimation of the SOP. For example, when braking, the energy feedback can be absorbed as much as possible without damaging the battery; when accelerating, the electric vehicle can provide larger power to obtain larger acceleration without damaging the battery; meanwhile, the power Of the vehicle can be ensured not to be lost due to undervoltage or overcurrent protection even when the SOC (State Of Charge) is very low in the driving process.
In the related art, the SOP is obtained by a table look-up method according to the current temperature and SOC, and the table is generally provided by a battery manufacturer according to the performance index of a battery cell.
However, the SOP table provided by the battery manufacturer is data obtained through experiments according to a brand new single battery, the data is discontinuous data, and an interpolation method is required to be adopted for calculation in use, so that the calculation precision is influenced; meanwhile, as the service life of the battery is reduced, the error is gradually increased, so that the calculation accuracy of the system is lower, and urgent solution is needed.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a method for estimating the SOP of a power battery, which can effectively improve the reliability of system control and improve the cycle life of a battery system.
Another objective of the present invention is to provide an estimation apparatus for SOP of a power battery.
It is a further object of the invention to propose a vehicle.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a method for estimating an SOP of a power battery, including the following steps: obtaining an initial SOP value according to the SOP data table; obtaining a current correction value according to the working current of the power battery and the corresponding battery voltage; and correcting the initial SOP value according to the current correction value to obtain the current SOP value of the power battery.
According to the estimation method of the SOP of the power battery, provided by the embodiment of the invention, the SOP is calculated and corrected in real time by acquiring the current of the power battery pack and the battery voltage under different currents, so that the SOP real-time value under the current state is obtained, the reliability of system control is effectively improved, the over-discharge and under-voltage faults of the power battery are avoided, and the cycle life of a battery system is prolonged.
Further, in an embodiment of the present invention, the obtaining an initial SOP value according to an SOP table further includes: detecting the current temperature and the current SOC value; and obtaining the initial SOP value according to the current temperature, the current SOC value and the SOP data table.
Further, in an embodiment of the present invention, the method further includes: obtaining the discharge cut-off voltage of the power battery according to the type of the power battery; and obtaining the current maximum discharge current according to the discharge cut-off voltage, the current battery voltage, the current correction value and the current working current.
Further, in an embodiment of the present invention, the calculation formula of the current maximum discharge current is:
Imax＝(Vend-Vtk)*K+Itk，
wherein, ImaxIs the present maximum discharge current, VendIs the discharge cut-off voltage, VtkFor the current battery voltage, K is the current corrective value, ItkIs the current operating current.
Further, in an embodiment of the present invention, the calculation formula of the current SOP value is:
SOPk＝λ*SOPk-1+Imax*Vend*(1-λ)，
wherein the SOPkFor said current SOP value, SOPk-1Is the previous SOP value, ImaxAnd lambda is a preset value for the current maximum discharge current.
In order to achieve the above object, another embodiment of the present invention provides an estimation apparatus for SOP of a power battery, including: the acquisition module is used for obtaining an initial SOP value according to the SOP data table; the first acquisition module is used for obtaining a current correction value according to the working current of the power battery and the corresponding battery voltage; and the calculation module is used for correcting the initial SOP value according to the current correction value so as to obtain the current SOP value of the power battery.
The estimation device of the SOP of the power battery in the embodiment of the invention calculates and corrects the SOP in real time by acquiring the current of the power battery pack and the battery voltage under different currents, thereby obtaining the SOP real-time value under the current state, effectively improving the reliability of system control, avoiding the over-discharge and under-voltage faults of the power battery and prolonging the cycle life of a battery system.
Further, in an embodiment of the present invention, the acquisition module further includes: the detection unit is used for detecting the current temperature and the current SOC value; and the acquisition unit is used for obtaining the initial SOP value according to the current temperature, the current SOC value and the SOP data table.
Further, in an embodiment of the present invention, the method further includes: the second acquisition module is used for acquiring the discharge cut-off voltage of the power battery according to the type of the power battery; and the third acquisition module is used for obtaining the current maximum discharge current according to the discharge cut-off voltage, the current battery voltage, the current correction value and the current working current.
Further, in an embodiment of the present invention, the calculation formula of the current maximum discharge current is:
Imax＝(Vend-Vtk)*K+Itk，
wherein, ImaxIs the present maximum discharge current, VendIs the discharge cut-off voltage, VtkFor the current battery voltage, K is the current corrective value, ItkIs the current operating current.
The calculation formula of the current SOP value is as follows:
SOPk＝λ*SOPk-1+Imax*Vend*(1-λ)，
wherein the SOPkFor said current SOP value, SOPk-1Is the previous SOP value, ImaxAnd lambda is a preset value for the current maximum discharge current.
In order to achieve the above object, an embodiment of another aspect of the present invention provides a vehicle including the above estimation apparatus of the SOP of the power battery. The vehicle calculates and corrects the SOP in real time by collecting the current of the power battery pack and the battery voltage under different currents, thereby obtaining the SOP real-time value under the current state, effectively improving the reliability of system control, avoiding the over-discharge and under-voltage faults of the power battery and prolonging the cycle life of the battery system.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of estimating SOP of a power cell according to an embodiment of the invention;
FIG. 2 is a diagram illustrating numerical correction according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an estimation device of a power battery SOP according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The method and apparatus for estimating the SOP of a power battery and a vehicle having the same according to the embodiments of the present invention will be described below with reference to the accompanying drawings, in which first the method for estimating the SOP of a power battery according to the embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a flowchart of a method for estimating the SOP of a power battery according to an embodiment of the present invention.
As shown in fig. 1, the estimation method of the power battery SOP includes the following steps:
in step S101, an initial SOP value is obtained from the SOP data table.
Further, in an embodiment of the present invention, obtaining the initial SOP value according to an SOP table further includes: detecting the current temperature and the current SOC value; and obtaining an initial SOP value according to the current temperature, the current SOC value and the SOP data table.
It is understood that SOP is the maximum discharge and charged power that the battery can provide at the next time; SOC represents the ratio of the remaining capacity of a battery after a period of use or long-term standing without use to its capacity in a fully charged state, expressed in percent. The value range of the battery charging indicator is 0-1, when the SOC is 0, the battery is completely discharged, and when the SOC is 1, the battery is completely charged. In order to obtain the initial SOP value, the present temperature and the present SOC value may be detected first, so as to obtain the SOP value in the present state by looking up a table according to the SOP data table determined by the temperature and the SOC provided by the power battery supplier, which is denoted as SOP 0.
In step S102, a current correction value is obtained according to the operating current of the power battery and the corresponding battery voltage.
It can be understood that, in the embodiment of the invention, the charging and discharging current value It1 at the moment t1 of the power battery can be obtained through the current sensor; obtaining a cell voltage detection value Vt1 of the power battery at the time t1 through a battery monitoring unit; the SOP value at this time was set as:
SOP1＝SOP0；
in addition, in the embodiment of the invention, the charging and discharging current value It2 of the power battery at the time t2 can be obtained through a current sensor; obtaining a cell voltage detection value Vt2 of the power battery at the time t2 through a battery monitoring unit;
calculated according to the following formula:
wherein K2 is a calculated value of the discharge current coefficient of the battery, and the unit is A/mv;
further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: obtaining the discharge cut-off voltage of the power battery according to the type of the power battery; and obtaining the current maximum discharge current according to the discharge cut-off voltage, the current battery voltage, the current correction value and the current working current.
In one embodiment of the present invention, the calculation formula of the current maximum discharge current is:
Imax＝(Vend-Vtk)*K+Itk，
wherein, ImaxAt the present maximum discharge current, VendTo discharge the cut-off voltage, VtkFor the current battery voltage, K for the current correction value, ItkIs the current operating current.
In one embodiment of the present invention, the calculation formula of the current SOP value is:
SOPk＝λ*SOPk-1+Imax*Vend*(1-λ)，
wherein the SOPkFor the current SOP value, SOPk-1Is the previous SOP value, ImaxIs the current maximum discharge currentAnd λ is a preset value.
It can be understood that the embodiment of the invention can determine the discharge cut-off voltage Vend of the power battery according to the type of the power battery; then the maximum discharge current in the present state, i.e. at time t2, is:
Imax＝(Vend-Vt2)*K+It2，
the formula for calculating the current value of the SOP at time t2 is:
SOP2＝λ*SOP1+Imax*Vend*(1-λ)，
from this, it can be seen that, for any time tK:
in step S103, the initial SOP value is corrected according to the current correction value to obtain the current SOP value of the power battery.
It can be understood that, in the embodiment of the present invention, after the current correction value is obtained according to the working current of the power battery and the corresponding battery voltage, the initial SOP value may be corrected according to the current correction value, where the K value and the SOP value are corrected as shown in fig. 2, so as to obtain the current SOP value of the power battery, avoid the occurrence of over-discharge and under-voltage faults of the battery, and improve the cycle life of the battery system.
According to the estimation method of the SOP of the power battery provided by the embodiment of the invention, the SOP is calculated and corrected in real time by acquiring the current of the power battery pack and the battery voltage under different currents, so that the SOP real-time value under the current state is obtained, the reliability of system control is effectively improved, the over-discharge and under-voltage faults of the power battery are avoided, and the cycle life of a battery system is prolonged.
Next, an estimation device of the SOP of the power battery proposed according to an embodiment of the present invention is described with reference to the drawings.
Fig. 3 is a schematic structural diagram of an estimation device of a power battery SOP according to an embodiment of the present invention.
As shown in fig. 3, the estimation device 10 for the SOP of the power battery includes: an acquisition module 100, a first acquisition module 200 and a calculation module 300.
The acquisition module 100 is configured to obtain an initial SOP value according to an SOP data table. The first obtaining module 200 is configured to obtain a current correction value according to a working current of the power battery and a corresponding battery voltage. The calculation module 300 is configured to correct the initial SOP value according to the current correction value to obtain a current SOP value of the power battery. The device 10 of the embodiment of the invention can calculate and correct the SOP in real time by collecting the current of the power battery pack and the battery voltage under different currents, thereby effectively improving the reliability of system control and prolonging the cycle life of a battery system.
Further, in an embodiment of the present invention, the acquisition module 100 further includes: a detection unit and an acquisition unit. The detection unit is used for detecting the current temperature and the current SOC value. The acquisition unit is used for acquiring an initial SOP value according to the current temperature, the current SOC value and the SOP data table.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: the device comprises a second acquisition module and a third acquisition module. The second acquisition module is used for acquiring the discharge cut-off voltage of the power battery according to the type of the power battery; the third obtaining module is used for obtaining the current maximum discharging current according to the discharging cut-off voltage, the current battery voltage, the current correction value and the current working current.
Further, in one embodiment of the present invention, the current maximum discharge current is calculated by the formula:
Imax＝(Vend-Vtk)*K+Itk，
wherein, ImaxAt the present maximum discharge current, VendTo discharge the cut-off voltage, VtkFor the current battery voltage, K for the current correction value, ItkIs the current operating current.
The current SOP value is calculated as:
SOPk＝λ*SOPk-1+Imax*Vend*(1-λ)，
wherein the SOPkFor the current SOP value, SOPk-1Is the previous SOP value, ImaxIs the current maximum discharge currentAnd λ is a preset value.
It should be noted that the foregoing explanation of the embodiment of the method for estimating the SOP of the power battery is also applicable to the device for estimating the SOP of the power battery of the embodiment, and is not repeated herein.
According to the estimation device of the power battery SOP provided by the embodiment of the invention, the SOP is calculated and corrected in real time by acquiring the current of the power battery pack and the battery voltage under different currents, so that the SOP real-time value under the current state is obtained, the reliability of system control is effectively improved, the over-discharge and under-voltage faults of the power battery are avoided, and the cycle life of a battery system is prolonged.
In addition, the embodiment of the invention also provides a vehicle, and the vehicle comprises the estimation device of the power battery SOP. The vehicle calculates and corrects the SOP in real time by collecting the current of the power battery pack and the battery voltage under different currents, thereby obtaining the SOP real-time value under the current state, effectively improving the reliability of system control, avoiding the over-discharge and under-voltage faults of the power battery and prolonging the cycle life of the battery system.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. A power battery SOP estimation method is characterized by comprising the following steps:
obtaining an initial SOP value according to the SOP data table;
obtaining a current correction value according to the working current of the power battery and the corresponding battery voltage, wherein a charging and discharging current value It1 at the moment of t1 of the power battery and a charging and discharging current value It2 at the moment of t2 of the power battery are obtained through a current sensor; obtaining a cell voltage detection value Vt1 of the power battery at the time t1 and a cell voltage detection value Vt2 of the power battery at the time t2 through a battery monitoring unit; calculating the current corrective value according to:
wherein K is a calculated value of the discharge current coefficient of the battery, and the unit is A/mV;
obtaining the discharge cut-off voltage of the power battery according to the type of the power battery;
obtaining the current maximum discharge current according to the discharge cut-off voltage, the current battery voltage, the current correction value and the current working current, wherein the calculation formula of the current maximum discharge current is as follows: i ismax＝(Vend-Vtk)*K+ItkWherein, ImaxIs the present maximum discharge current, VendIs the discharge cut-off voltage, VtkFor the current battery voltage, K is the current corrective value, ItkIs the current working current; and
correcting the initial SOP value according to the current correction value to obtain the current SOP value of the power battery, wherein the calculation formula of the current SOP valueComprises the following steps: SOPk＝λ*SOPk-1+Imax*Vend(1- λ), wherein said SOPkFor said current SOP value, SOPk-1Is the previous SOP value, ImaxAnd lambda is a preset value for the current maximum discharge current.
2. The method for estimating the SOP of the power battery according to claim 1, wherein the obtaining an initial SOP value according to an SOP table further comprises:
detecting the current temperature and the current SOC value;
and obtaining the initial SOP value according to the current temperature, the current SOC value and the SOP data table.
3. An estimation device of a power battery SOP, characterized by comprising:
the acquisition module is used for obtaining an initial SOP value according to the SOP data table;
the first obtaining module is used for obtaining a current correction value according to the working current of the power battery and the corresponding battery voltage, wherein a charging and discharging current value It1 at the t1 moment of the power battery and a charging and discharging current value It2 at the t2 moment of the power battery are obtained through a current sensor; obtaining a cell voltage detection value Vt1 of the power battery at the time t1 and a cell voltage detection value Vt2 of the power battery at the time t2 through a battery monitoring unit; calculating the current corrective value according to:
wherein K is a calculated value of the discharge current coefficient of the battery, and the unit is A/mV;
the second acquisition module is used for acquiring the discharge cut-off voltage of the power battery according to the type of the power battery;
a third obtaining module, configured to obtain a current maximum discharge current according to the discharge cut-off voltage, the current battery voltage, the current correction value, and the current working current, where a calculation formula of the current maximum discharge current is: i ismax＝(Vend-Vtk)*K+ItkWherein, ImaxIs the current mostLarge discharge current, VendIs the discharge cut-off voltage, VtkFor the current battery voltage, K is the current corrective value, ItkIs the current working current; and
a calculating module, configured to correct the initial SOP value according to the current correction value to obtain a current SOP value of the power battery, where a calculation formula of the current SOP value is: SOPk＝λ*SOPk-1+Imax*Vend(1- λ), wherein said SOPkFor said current SOP value, SOPk-1Is the previous SOP value, ImaxAnd lambda is a preset value for the current maximum discharge current.
4. The estimation device of the power battery SOP according to claim 3, wherein the acquisition module further comprises:
the detection unit is used for detecting the current temperature and the current SOC value;
and the acquisition unit is used for obtaining the initial SOP value according to the current temperature, the current SOC value and the SOP data table.
5. A vehicle, characterized by comprising: estimation device of the SOP of a power cell according to any of the claims 3-4.
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| CN108845273B (en) * | 2018-08-30 | 2020-11-03 | 北京经纬恒润科技有限公司 | Power battery power state estimation function test method and device |
| CN109116254B (en) * | 2018-08-30 | 2020-11-03 | 北京经纬恒润科技有限公司 | Power battery power state estimation function test method and device |
| CN111443290B (en) * | 2019-12-30 | 2021-08-06 | 南京航空航天大学 | SOP estimation method for power battery of electric vehicle with closed-loop control |
| CN112154341A (en) * | 2020-01-13 | 2020-12-29 | 深圳市大疆创新科技有限公司 | Method for estimating power output capability, battery pack, movable platform and storage medium |
| CN114148218B (en) * | 2020-09-07 | 2023-09-08 | 北汽福田汽车股份有限公司 | Method and device for updating SOP parameter value of battery system and electric automobile |
| WO2022151482A1 (en) * | 2021-01-18 | 2022-07-21 | 深圳市大疆创新科技有限公司 | State of power estimation method for unmanned aerial vehicle battery, and electronic device |
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