CN112051505A - SOC correction method, device, medium and equipment for power battery - Google Patents

SOC correction method, device, medium and equipment for power battery Download PDF

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CN112051505A
CN112051505A CN202010833803.0A CN202010833803A CN112051505A CN 112051505 A CN112051505 A CN 112051505A CN 202010833803 A CN202010833803 A CN 202010833803A CN 112051505 A CN112051505 A CN 112051505A
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soc
value
power battery
actual
correction
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CN112051505B (en
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李皓月
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The disclosure relates to a method, a device, a medium and equipment for correcting SOC of a power battery, which can not only finish correction of SOC before the charging and discharging of the power battery are stopped, but also ensure the smoothness of SOC change. The method comprises the following steps: under the condition that a power battery contactor is closed, acquiring an SOC actual value of the power battery; determining an SOC display value corresponding to the SOC actual value; determining a correction factor according to a state parameter of the power battery, the SOC actual value and the SOC display value, wherein the state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining an SOC correction rate; and correcting the SOC of the power battery according to the correction factor.

Description

SOC correction method, device, medium and equipment for power battery
Technical Field
The present disclosure relates to the field of power batteries, and in particular, to a method, an apparatus, a medium, and a device for correcting SOC of a power battery.
Background
Currently, SOC (State of Charge) estimation of a new energy vehicle generally combines an Open Circuit Voltage (OCV) lookup table method and an ampere-hour integration method. However, after the vehicle is left for a long time, the value obtained by the OCV table lookup method may be different from the value before the vehicle is dormant in the previous cycle, and therefore, after the vehicle is awakened, the SOC may jump due to OCV correction. Meanwhile, considering the service life of the battery, the displayed electric quantity of the power battery needs to be corrected before the charge is cut off or before the discharge is cut off to avoid the overcharge or overdischarge phenomenon, so the SOC is generally divided into the displayed SOC and the actual SOC, the displayed SOC can be directly observed through an SOC display device (for example, a display screen and an instrument panel on a vehicle or a display screen of a mobile terminal) for displaying the current SOC value, the current remaining electric quantity can be intuitively informed to a user, and when the actual SOC and the displayed SOC are different, a certain degree of correction is needed in consideration of the basic requirement that the displayed SOC value cannot jump. In the related art, the strategy of correction is generally based on the concept of staged correction, for example, defining SOC of different stages or voltage correction rates of different single batteries, the method is complex, and the correction rate is not smooth enough, and smooth correction still cannot be realized before the charging and discharging of the vehicle or the power battery are cut off.
Disclosure of Invention
The invention aims to provide a method, a device, a medium and equipment for correcting the SOC of a power battery, which can not only enable the SOC to be corrected before the charging and discharging of the power battery are stopped, but also ensure the smoothness of the change of the SOC.
In order to achieve the above object, according to a first aspect of the present disclosure, there is provided a method for correcting SOC of a power battery, the method including:
under the condition that a power battery contactor is closed, acquiring an SOC actual value of the power battery;
determining an SOC display value corresponding to the SOC actual value;
determining a correction factor according to a state parameter of the power battery, the SOC actual value and the SOC display value, wherein the state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining an SOC correction rate;
and correcting the SOC of the power battery according to the correction factor.
Optionally, the determining the SOC display value corresponding to the SOC actual value includes:
an SOC display value Ds corresponding to the SOC actual value Rs is determined according to the following equation:
Figure BDA0002638949200000021
wherein Ws1 is the actual lower limit value of the SOC of the power battery, Ws2 is the actual upper limit value of the SOC of the power battery, M1 is the lower limit value of the SOC display of the power battery, and M2 is the upper limit value of the SOC display of the power battery.
Optionally, the determining a correction factor according to the state parameter of the power battery, the SOC actual value and the SOC display value includes:
if the power battery is in a discharging state and the SOC display value is larger than the SOC actual value, determining that the correction factor is a first numerical value;
if the power battery is in a discharging state and the SOC display value is smaller than or equal to the SOC actual value, determining the correction factor as a second numerical value;
if the power battery is in a charging state and the SOC display value is larger than the SOC actual value, determining that the correction factor is a third numerical value;
and if the power battery is in a charging state and the SOC display value is smaller than or equal to the SOC actual value, determining that the correction factor is a fourth numerical value.
Optionally, the first value K1 is determined by the following formula:
Figure BDA0002638949200000031
the second value K2 is determined by the following formula:
Figure BDA0002638949200000032
the third value K3 is determined by the following formula:
Figure BDA0002638949200000033
the fourth value K4 is determined by the following formula:
Figure BDA0002638949200000034
wherein Rs is the SOC actual value, Ds is the SOC display value, Ws1 is the SOC actual lower limit value of the power battery, and Ws2 is the SOC actual upper limit value of the power battery.
Optionally, the performing SOC correction on the power battery according to the correction factor includes:
acquiring an initial correction rate of the power battery;
taking the product of the initial correction rate and the correction factor as a target correction rate;
and according to the target correction rate, performing SOC correction on the power battery.
Optionally, if the power battery is in a charging state, the method further includes:
determining the maximum voltage value in the voltages of all battery monomers in the power battery in real time;
when the maximum voltage value reaches a first voltage threshold value, correcting the SOC value currently displayed by the SOC display device to a first target SOC value according to a first correction rate;
when the maximum voltage value reaches a second voltage threshold value, correcting the SOC value currently displayed by the SOC display device to a second target SOC value according to a second correction rate, wherein the second voltage threshold value is larger than the first voltage threshold value, and the second target SOC value is larger than the first target SOC value;
when the SOC value currently displayed by the SOC display device is larger than a first preset SOC value and the charging current of the power battery is smaller than a first current threshold value, correcting the SOC value currently displayed by the SOC display device to a third target SOC value according to a third correction rate, wherein both the first preset SOC value and the third target SOC value are larger than the second target SOC value;
and when the maximum voltage value in the voltages of all the single batteries in the power battery reaches the second voltage threshold value and the charging current of the power battery is smaller than the second current threshold value, correcting the SOC value currently displayed by the SOC display device to the SOC display upper limit value of the power battery according to a fourth correction rate.
Optionally, before the step of correcting the SOC value currently displayed by the SOC display device to the first target SOC value, the method further includes:
comparing the SOC value currently displayed by the SOC display device with a second preset SOC value;
if the SOC value currently displayed by the SOC display device is smaller than the second preset SOC value, taking the second preset SOC value as the first target SOC value;
if the SOC value currently displayed by the SOC display device is larger than or equal to the second preset SOC value, taking a third preset SOC value as the first target SOC value, wherein the third preset SOC value is larger than the second preset SOC value and smaller than the second target SOC value;
alternatively, before the step of correcting the SOC value currently displayed by the SOC display device to the second target SOC value, the method further includes:
comparing the SOC value currently displayed by the SOC display device with a fourth preset SOC value;
if the SOC value currently displayed by the SOC display device is smaller than the fourth preset SOC value, taking the fourth preset SOC value as the second target SOC value;
if the SOC value currently displayed by the SOC display device is larger than or equal to the fourth preset SOC value, taking a fifth preset SOC value as the first target SOC value, wherein the fifth preset SOC value is larger than the fourth preset SOC value and smaller than the third target SOC value.
According to a second aspect of the present disclosure, there is provided an SOC correction apparatus for a power battery, the apparatus including:
the acquisition module is used for acquiring the SOC actual value of the power battery under the condition that a power battery contactor is closed;
a first determination module for determining an SOC display value corresponding to the SOC actual value;
the second determination module is used for determining a correction factor according to a state parameter of the power battery, the SOC actual value and the SOC display value, wherein the state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining an SOC correction rate;
and the correction module is used for correcting the SOC of the power battery according to the correction factor.
Optionally, the first determining module is configured to determine the SOC display value Ds corresponding to the SOC actual value Rs according to the following formula:
Figure BDA0002638949200000051
wherein Ws1 is the actual lower limit value of the SOC of the power battery, Ws2 is the actual upper limit value of the SOC of the power battery, M1 is the lower limit value of the SOC display of the power battery, and M2 is the upper limit value of the SOC display of the power battery.
Optionally, the second determining module includes:
the first determining submodule is used for determining the correction factor as a first numerical value if the power battery is in a discharging state and the SOC display value is greater than the SOC actual value;
the second determining submodule is used for determining the correction factor as a second numerical value if the power battery is in a discharging state and the SOC display value is smaller than or equal to the SOC actual value;
the third determining submodule is used for determining the correction factor as a third numerical value if the power battery is in a charging state and the SOC display value is greater than the SOC actual value;
and the fourth determining submodule is used for determining the correction factor as a fourth numerical value if the power battery is in a charging state and the SOC display value is less than or equal to the SOC actual value.
Optionally, the first value K1 is determined by the following formula:
Figure BDA0002638949200000061
the second value K2 is determined by the following formula:
Figure BDA0002638949200000062
the third value K3 is determined by the following formula:
Figure BDA0002638949200000063
the fourth value K4 is determined by the following formula:
Figure BDA0002638949200000064
wherein Rs is the SOC actual value, Ds is the SOC display value, Ws1 is the SOC actual lower limit value of the power battery, and Ws2 is the SOC actual upper limit value of the power battery.
Optionally, the correction module includes:
the obtaining submodule is used for obtaining an initial correction rate of the power battery;
a fifth determining submodule, configured to use a product of the initial correction rate and the correction factor as a target correction rate;
and the first correction submodule is used for correcting the SOC of the power battery according to the target correction rate.
Optionally, the modification module further includes:
the sixth determining submodule is used for determining the maximum voltage value in the voltages of all the battery monomers in the power battery in real time if the power battery is in a charging state;
the second correction submodule is used for correcting the SOC value currently displayed by the SOC display device to a first target SOC value according to a first correction rate when the maximum voltage value reaches a first voltage threshold value;
the third correction submodule is used for correcting the SOC value currently displayed by the SOC display device to a second target SOC value according to a second correction rate when the maximum voltage value reaches a second voltage threshold value, wherein the second voltage threshold value is larger than the first voltage threshold value, and the second target SOC value is larger than the first target SOC value;
the fourth correction submodule is used for correcting the SOC value currently displayed by the SOC display device to a third target SOC value according to a third correction rate when the SOC value currently displayed by the SOC display device is larger than a first preset SOC value and the charging current of the power battery is smaller than a first current threshold value, wherein both the first preset SOC value and the third target SOC value are larger than the second target SOC value;
and the fifth correction submodule is used for correcting the SOC value currently displayed by the SOC display device to the SOC display upper limit value of the power battery according to a fourth correction rate when the maximum voltage value in the voltages of all the single batteries in the power battery reaches the second voltage threshold value and the charging current of the power battery is smaller than the second current threshold value.
Optionally, the correction module is configured to: before the second correction submodule corrects the SOC value currently displayed by the SOC display device to the first target SOC value, the SOC value currently displayed by the SOC display device is compared with a second preset SOC value; if the SOC value currently displayed by the SOC display device is smaller than the second preset SOC value, taking the second preset SOC value as the first target SOC value; if the SOC value currently displayed by the SOC display device is larger than or equal to the second preset SOC value, taking a third preset SOC value as the first target SOC value, wherein the third preset SOC value is larger than the second preset SOC value and smaller than the second target SOC value;
or, the correction module is configured to: before the third correction submodule corrects the SOC value currently displayed by the SOC display device to the second target SOC value, the SOC value currently displayed by the SOC display device is compared with a fourth preset SOC value; if the SOC value currently displayed by the SOC display device is smaller than the fourth preset SOC value, taking the fourth preset SOC value as the second target SOC value; if the SOC value currently displayed by the SOC display device is larger than or equal to the fourth preset SOC value, taking a fifth preset SOC value as the first target SOC value, wherein the fifth preset SOC value is larger than the fourth preset SOC value and smaller than the third target SOC value.
According to a third aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect of the present disclosure.
According to a fourth aspect of the present disclosure, there is provided an electronic device comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of the first aspect of the disclosure.
According to the technical scheme, under the condition that the power battery contactor is closed, the SOC actual value of the power battery is obtained, the SOC display value corresponding to the SOC actual value is determined, then the correction factor is determined according to the state parameter of the power battery, the SOC actual value and the SOC display value, and the SOC of the power battery is corrected according to the correction factor. The state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining the SOC correction rate. Therefore, according to the charging and discharging states of the power battery, the actual value and the display value of the SOC, the corresponding correction factors are determined and correspondingly corrected. Therefore, the correction factor can be generated according to the actual state, the actual SOC and the SOC corresponding to the display, namely, the appropriate correction factor which is consistent with the actual situation of the power battery is generated, so that the smoothness of the displayed SOC change can be ensured based on the correction factor, a user can observe the SOC without jumping, the SOC can be ensured to be corrected before the charge and discharge of the power battery are cut off, the phenomena of overcharge and overdischarge are avoided, and the safety is ensured.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart of a method for correcting SOC of a power battery according to an embodiment of the present disclosure;
FIG. 2 is an exemplary flowchart of the steps of determining a correction factor according to the state parameter of the power battery, the actual value of the SOC, and the SOC display value in the SOC correction method of the power battery according to the present disclosure;
FIG. 3 is a flowchart illustrating an exemplary SOC correction of a power battery according to a correction factor in a SOC correction method of a power battery according to the present disclosure;
FIG. 4 is a flow chart of a method for correcting SOC of a power battery according to another embodiment of the present disclosure;
fig. 5 is an exemplary schematic diagram of a charging current at the end of charging a power battery in the SOC correction method for a power battery provided according to the present disclosure;
fig. 6 is an exemplary schematic diagram of a maximum value of voltages of the individual batteries of the power battery at the end of charging the power battery in the SOC correction method of the power battery provided according to the present disclosure;
FIG. 7 is an exemplary schematic diagram of the SOC displayed at the end of the charging of the power battery in the SOC correction method for the power battery according to the present disclosure;
fig. 8 is a block diagram of an SOC correction apparatus for a power battery provided according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
As described in the background art, the conventional correction strategy is generally based on the concept of staged correction, and not only the method is complicated, but also the change of SOC after correction is not smooth enough, and smooth correction cannot be realized before the charge and discharge of the vehicle or the power battery are cut off. In addition, because the charging time of the vehicle is generally long, the floating charging strategy is generally adopted in the prior charging, namely, the charging is carried out by large current in the early stage of the charging, and the charging process of CC-CV (constant current-constant voltage) is simulated by a scheme of multiple current reduction in the later stage of the charging, so that the correction curve of full charging is not smooth enough, and unreasonable display is realized. And, there is also a problem that the design of the correction rate of the power battery is not comprehensive in different states, for example, the situations that the displayed SOC is larger than or smaller than the actual SOC in the charging and discharging states are not considered.
In order to solve the technical problem, the present disclosure provides a method, an apparatus, a medium, and a device for correcting SOC of a power battery, which can not only complete correction of SOC before the power battery is charged and discharged, but also ensure smoothness of SOC variation.
Fig. 1 is a flowchart of a method for correcting SOC of a power battery according to an embodiment of the present disclosure. As shown in fig. 1, the method may include the following steps.
In step 11, the actual value of the SOC of the power battery is acquired with the power battery contactor closed.
When the power battery contactor is closed, the power battery may be in a charging or discharging state, and at this time, the SOC may be changed. Therefore, in the case that the power battery contactor is determined to be closed, the SOC actual value of the power battery is acquired again.
As described in the background art, currently, the SOC is generally divided into a display SOC and an actual SOC, where the actual SOC is an actual SOC value obtained by an existing SOC determining manner, and the display SOC is an SOC value presented to a user through an SOC display device (e.g., a vehicle display screen, a vehicle dashboard, a mobile terminal display screen, etc.), and there may be a certain difference between the two.
Therefore, in the case of determining that the power battery contactor is closed, the SOC actual value of the power battery is obtained, where the SOC actual value is the actual SOC value obtained by the existing SOC determining manner described above.
In step 12, an SOC display value corresponding to the actual SOC value is determined.
After the SOC actual value is acquired, in order to perform SOC correction, an SOC display value corresponding to the acquired SOC actual value may be determined.
Normally, the SOC display device corresponding to the power battery corresponds to an SOC display window, after the power battery is discharged, the SOC display window displays a lower display value limit, and after the power battery is fully charged, the display window displays an upper display value limit. The lower limit of the display value of the SOC display window is set as the lower limit of the SOC display of the power battery, and the upper limit of the display value of the SOC display window is set as the upper limit of the SOC display of the power battery. For example, the lower limit value of the SOC display of the power battery may be set to 0, and the upper limit value of the SOC display of the power battery may be set to 100(100 is a percentage value representing 100% of the electric quantity, and may be displayed as 100 or 100% when displayed, which is the same as the above).
Meanwhile, the power battery corresponds to an SOC actual window, the lower limit of the SOC actual window is the SOC limit of the maximum allowable discharging of the power battery, and the upper limit of the SOC actual window is the SOC limit of the maximum allowable charging of the power battery. The upper limit and the lower limit of the SOC actual window can be defined according to the discharging capacities of different battery cores. And setting the lower limit of the SOC actual window as the SOC actual lower limit of the power battery, and setting the upper limit of the SOC actual window as the SOC actual upper limit of the power battery. For example, the lower practical SOC limit of the power battery may be set to 5(5 is a percentage value representing 5% of the electric quantity), and the upper practical SOC limit of the power battery may be set to 95(95 is a percentage value representing 95% of the electric quantity).
Moreover, the values in the SOC display window and the SOC actual window need to be in one-to-one correspondence and completely matched, for example, when the power battery discharges, the SOC actual window reaches the SOC actual lower limit value of the power battery, and accordingly, the SOC display window should also be displayed as the SOC display lower limit value of the power battery. Further, since both the upper and lower limits are known, the conversion relationship between the two, that is, the conversion relationship between the actual value of the SOC and the displayed value of the SOC, is easily obtained.
For example, based on the above-mentioned idea, assuming that the SOC display value is SOC actual value X + b, the SOC actual window and the SOC display window are linearly corresponding as follows:
Ws1*X+b＝M1
Ws2*X+b＝M2
wherein Ws1 is the actual lower limit value of the SOC of the power battery, Ws2 is the actual upper limit value of the SOC of the power battery, M1 is the lower limit value of the SOC display of the power battery, and M2 is the upper limit value of the SOC display of the power battery.
Two equations are combined to obtain:
Figure BDA0002638949200000121
Figure BDA0002638949200000122
therefore, based on the above-described SOC display value ═ SOC actual value × + b, SOC display value Ds corresponding to SOC actual value Rs can be determined according to the following formula:
Figure BDA0002638949200000123
wherein Ws1 is the actual lower limit value of the SOC of the power battery, Ws2 is the actual upper limit value of the SOC of the power battery, M1 is the lower limit value of the SOC display of the power battery, and M2 is the upper limit value of the SOC display of the power battery.
In step 13, a correction factor is determined according to the state parameter of the power battery, the SOC actual value and the SOC display value.
The state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining the SOC correction rate.
In one possible embodiment, step 13 may include the steps of:
if the power battery is in a discharging state and the SOC display value is larger than the SOC actual value, determining that the correction factor is a first numerical value;
if the power battery is in a discharging state and the SOC display value is smaller than or equal to the SOC actual value, determining the correction factor as a second numerical value;
if the power battery is in a charging state and the SOC display value is larger than the SOC actual value, determining the correction factor as a third numerical value;
and if the power battery is in a charging state and the SOC display value is smaller than or equal to the SOC actual value, determining the correction factor as a fourth numerical value.
When the power battery is in a discharge state, (the rate from the SOC actual value to the SOC actual lower limit value, the relative change coefficient between the actual SOC and the displayed SOC), which is the rate from the SOC displayed value to the SOC actual lower limit value, includes:
Ds-ΔDs*t＝Ws1
Rs-ΔRs*t＝Ws1
where Rs is the SOC actual value, Ds is the SOC display value, and Ws1 is the SOC actual lower limit value of the power battery. Δ Ds is a rate of change of the displayed SOC per unit time, that is, a rate of change of the SOC displayed by the SOC display means per unit time, Δ Rs is a rate of change of the actual SOC per unit time, and t is a time during which both the SOC actual value and the SOC displayed value change to the SOC actual lower limit value, where Δ Ds, Δ Rs, and t are intermediate amounts introduced for calculation.
Thus, the correction factor is a ratio of the absolute value of the difference obtained by subtracting the display electric quantity from the actual electric quantity to the absolute value of the difference obtained by subtracting the actual electric quantity from the window (upper limit or lower limit) of the actual electric quantity. The following can be obtained:
Figure BDA0002638949200000131
therefore, in the case where the SOC display value is larger than the SOC actual value, the correction factor can be used
Figure BDA0002638949200000132
Indicating that the correction factor is usable in the case where the SOC display value is less than or equal to the actual value of SOC
Figure BDA0002638949200000133
And (4) showing.
Based on the above, the first value K1 may be determined by the following formula:
Figure BDA0002638949200000134
where Rs is the SOC actual value, Ds is the SOC display value, and Ws1 is the SOC actual lower limit value of the power battery.
For example, the second value K2 may be determined by the following formula:
Figure BDA0002638949200000135
where Rs is the SOC actual value, Ds is the SOC display value, and Ws1 is the SOC actual lower limit value of the power battery.
When the power battery is in a charged state, (a rate from the SOC actual value to the SOC actual upper limit value, a relative change coefficient between the actual SOC and the displayed SOC), that is, a rate from the SOC displayed value to the SOC actual upper limit value, there are:
Ds+ΔDs*t＝Ws2
Rs+ΔRs*t＝Ws2
where Rs is the SOC actual value, Ds is the SOC display value, and Ws2 is the SOC actual upper limit value of the power battery. Δ Ds is a rate of change of the displayed SOC per unit time, that is, a rate of change of the SOC displayed by the SOC display means per unit time, Δ Rs is a rate of change of the actual SOC per unit time, and t is a time during which both the SOC actual value and the SOC displayed value change to the SOC actual upper limit value, where Δ Ds, Δ Rs, and t are intermediate amounts introduced for calculation.
Thus, the correction factor is a ratio of the absolute value of the difference obtained by subtracting the display electric quantity from the actual electric quantity to the absolute value of the difference obtained by subtracting the actual electric quantity from the window (upper limit or lower limit) of the actual electric quantity. The following can be obtained:
Figure BDA0002638949200000141
therefore, in the case where the SOC display value is larger than the SOC actual value, the correction factor can be used
Figure BDA0002638949200000142
Indicating that the correction factor is usable in the case where the SOC display value is less than or equal to the actual value of SOC
Figure BDA0002638949200000143
And (4) showing.
Based on the above, the third value K3 may be determined by the following formula:
Figure BDA0002638949200000144
where Rs is the SOC actual value, Ds is the SOC display value, and Ws2 is the SOC actual upper limit value of the power battery.
For example, the fourth value K4 may be determined by the following formula:
Figure BDA0002638949200000145
where Rs is the SOC actual value, Ds is the SOC display value, and Ws2 is the SOC actual upper limit value of the power battery.
Illustratively, in this embodiment, the correction factor may be determined as shown in FIG. 2. Note that a correction factor of 0 means that SOC correction is not performed.
Returning to fig. 1, in step 14, the SOC of the power battery is corrected according to the correction factor.
In one possible embodiment, step 14 may include the following steps, as shown in fig. 3:
in step 31, acquiring an initial correction rate of the power battery;
in step 32, taking the product of the initial correction rate and the correction factor as the target correction rate;
in step 33, SOC correction is performed on the power battery in accordance with the target correction rate.
Wherein the initial correction rate of the power battery is directly available. For example, the initial correction rate may be a correction rate corresponding to an ampere-hour integration method.
Therefore, based on the initial correction rate and the correction factor, the product of the initial correction rate and the correction factor is used as the target correction rate, and the target correction rate is applied to the SOC correction of the power battery. The SOC is corrected according to the correction rate, which belongs to the common knowledge in the art and is not described herein again.
According to the technical scheme, under the condition that the power battery contactor is closed, the SOC actual value of the power battery is obtained, the SOC display value corresponding to the SOC actual value is determined, then the correction factor is determined according to the state parameter of the power battery, the SOC actual value and the SOC display value, and the SOC of the power battery is corrected according to the correction factor. The state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining the SOC correction rate. Therefore, according to the charging and discharging states of the power battery, the actual value and the display value of the SOC, the corresponding correction factors are determined and correspondingly corrected. Therefore, the correction factor can be generated according to the actual state, the actual SOC and the SOC corresponding to the display, namely, the appropriate correction factor which is consistent with the actual situation of the power battery is generated, so that the smoothness of the displayed SOC change can be ensured based on the correction factor, a user can observe the SOC without jumping, the SOC can be ensured to be corrected before the charge and discharge of the power battery are cut off, the phenomena of overcharge and overdischarge are avoided, and the safety is ensured.
Generally, at the end of charging the power battery, the battery is generally required to be fully charged through several float charging processes, and in this case, it is first required to estimate the power battery full charge based on the cell characteristics, the charging strategy and the like, which requires several float charging processes and the time required for each float charging. For example, charging with a current of 0.1C (1C current indicates that a current as large as the battery capacity is output) is completed until the voltage of the power battery reaches the cut-off voltage. In this process, since the charging current is changed in stages (different according to different float charging processes), the maximum cell voltage (i.e., the maximum value of the voltage of each cell of the power battery) may also suddenly change, and therefore, the SOC displayed by the SOC display device may also jump accordingly, and the correction may be started some time before the float charging process is started in consideration of the smoothness of the displayed SOC.
Therefore, optionally, if the power battery is in a charging state, on the basis of the SOC correction manner shown in fig. 3, the method provided by the present disclosure may further include the following steps, as shown in fig. 4:
in step 41, determining the maximum voltage value in the voltages of the battery cells in the power battery in real time;
in step 42, when the maximum voltage value reaches the first voltage threshold, correcting the SOC value currently displayed by the SOC display device to a first target SOC value according to a first correction rate;
in step 43, when the maximum voltage value reaches the second voltage threshold, the SOC value currently displayed by the SOC display device is corrected to a second target SOC value according to a second correction rate;
in step 44, when the SOC value currently displayed by the SOC display device is greater than the first preset SOC value and the charging current of the power battery is less than the first current threshold, correcting the SOC value currently displayed by the SOC display device to a third target SOC value according to a third correction rate;
in step 45, when the maximum voltage value of the voltages of the battery cells in the power battery reaches the second voltage threshold and the charging current of the power battery is smaller than the second current threshold, the SOC value currently displayed by the SOC display device is corrected to the SOC display upper limit value of the power battery according to a fourth correction rate.
The first voltage threshold and the second voltage threshold may be preset according to an actual scene or an empirical value, and the second voltage threshold is greater than the first voltage threshold. Each power battery is provided with a cut-off voltage, and the first voltage threshold and the second voltage threshold can be set according to the cut-off voltage. For example, the first voltage threshold may be set to be smaller than the cut-off voltage, for example, to be set to (cut-off voltage — preset voltage value), wherein the preset voltage value may be set according to the cell characteristics of the power battery itself, for example, may be set to 8mV (millivolts). For example, the second voltage threshold may be set as the cutoff voltage described above.
The first current threshold and the second current threshold may be preset according to an actual scene or an empirical value, and the first current threshold may be greater than the second current threshold. Illustratively, the first current threshold may be set at 20A (amperes). For example, the second current threshold may be set to 0.1C (1C current indicates that a current as large as the battery capacity is output).
The first target SOC value, the second target SOC value and the third target SOC value can be preset according to an actual scene or an empirical value. In addition, the first target SOC value, the second target SOC value, and the third target SOC value may be set to increase in order. For example, the first target SOC value is set to 95%, the second target SOC value is set to 98%, and the third SOC value is set to 99.9%. And the first target SOC value, the second target SOC value and the third target SOC value are all smaller than the SOC display upper limit value of the power battery.
In the method shown in fig. 4, during the SOC correction by the method shown in fig. 3, the voltages of the battery cells in the power battery are determined in real time at step 41, and the maximum voltage value is determined. Thereafter, when the maximum voltage value satisfies a predetermined condition, the subsequent steps 42 to 45 are executed. Wherein, steps 42 to 45 are executed in sequence from first to last.
That is, the maximum voltage value of the voltages of the individual batteries in the power battery is determined in real time, and it is determined whether the real-time maximum voltage value reaches the first voltage threshold, and when it is determined that the maximum voltage value reaches the first voltage threshold, the SOC value currently displayed by the SOC display device is corrected to the first target SOC value at the first correction rate, and step 42 is completed.
At this time, the maximum voltage value of the voltages of the individual batteries in the power battery is still determined in real time, and when the maximum voltage value reaches the second voltage threshold, the SOC value currently displayed by the SOC display device is corrected to the second target SOC value according to the second correction rate, and step 43 is finished.
And then, when the SOC value currently displayed by the SOC display device is larger than the first preset SOC value and the charging current of the power battery is smaller than the first current threshold value, correcting the SOC value currently displayed by the SOC display device to a third target SOC value according to a third correction rate.
Wherein both the first preset SOC value and the third target SOC value are greater than the second target SOC value.
And then, when the maximum voltage value in the voltages of the battery cells in the power battery reaches a second voltage threshold value and the charging current of the power battery is smaller than a second current threshold value, correcting the SOC value currently displayed by the SOC display device to the SOC display upper limit value of the power battery according to a fourth correction rate.
Since the real-time values are used here, it is obvious that the maximum voltage value in step 42, the maximum voltage value in step 43, and the maximum voltage value in step 45 are not the same voltage value.
The first modification rate may be preset, and for example, the first modification rate may be set to be equal to or greater than (generally slightly greater than) the target modification rate. The second modification rate may be set in advance, and for example, the second modification rate may be set to 1.5 times the target modification rate to 2 times the target modification rate. The third correction rate may not necessarily be set in advance, and a time period may be set, and the rate at which the SOC value currently displayed by the SOC display device in step 44 can be corrected to the third target SOC value within this time period may be set as the third correction rate. The fourth correction rate may be set to the maximum rate allowed for the SOC correction of the power battery.
Since the SOC values currently displayed in real time by the SOC display device are used in all of steps 42 to 45, the SOC values currently displayed by the SOC display device in each of steps 42 to 45 are different.
The conditions for determining whether to perform the correction in steps 42 to 45 are to determine the position where the charging current and the maximum cell voltage may suddenly change, and perform the correction before the position, so as to avoid the apparent jump of the displayed SOC.
The following describes some of the above steps in detail with reference to specific examples. Assuming that the cut-off voltage is 4.16V (volt), the charging current at the end of the power battery charging can be shown in fig. 5, the maximum cell voltage at the end of the power battery charging (i.e. the maximum value of the voltage of each cell of the power battery) can be shown in fig. 6, it can be seen that the floating charge is in several stages, and the maximum cell voltage can suddenly drop when a new floating charge starts. Accordingly, the first voltage threshold value may be set to 4.152V, the second voltage threshold value may be set to 4.16V, the first target SOC value may be set to 95%, the second target SOC value may be set to 98%, the third SOC value may be set to 99.9%, the SOC display upper limit value of the power battery may be set to 100%, the first preset SOC value may be set to 99.3%, the first current threshold value may be set to 20A, and the second current threshold value may be set to 0.1C. Steps 42-45 can be described as follows:
when the maximum voltage in the battery cells of the power battery reaches 4.152V, correcting the SOC value currently displayed by the SOC display device to 95% at a first correction rate, then, when the maximum voltage in the battery cells of the power battery reaches 4.16V, correcting the SOC value currently displayed by the SOC display device to 98% at a second correction rate, then, when the SOC value currently displayed by the SOC display device reaches 99.3% and the current charging current of the power battery is less than 20A, correcting the SOC value currently displayed by the SOC display device to 99.9% at a third correction rate, and then, when the maximum voltage in the battery cells of the power battery reaches 4.16V and the current charging current of the power battery is less than 0.1C, correcting the SOC value currently displayed by the SOC display device to 100% at a fourth correction rate, and finishing the correction.
The SOC curve displayed by the SOC display device may be as shown in fig. 7. As can be seen in connection with fig. 7: at the first correction point (corresponding to the correction of step 42), it shows that SOC is 95.4%, the maximum cell voltage is 4.152V, and the time is 1h28 m; at the second correction point (corresponding to the correction of step 43), it shows that SOC is 95.5%, maximum cell voltage is 4.16V, time is 1h28m46s, at which point the correction is started and corrected to 98% cutoff, cutoff time is 1h32m39 s; at the third correction point (corresponding to the correction of step 44), the current is 16A, showing an SOC of 98.4% and a time of 1h41m54s, at which time the correction is started, with a 99.9% cut-off and a cut-off time of 1h44m2 s; at the fourth correction point (corresponding to the correction of step 45), the maximum cell voltage is 4.16V for 1h49m18 s; at this point the correction was started and corrected to a 100.0% cutoff with a cutoff time of 1h49m19 s.
In addition, optionally, before correcting the SOC value currently displayed by the SOC display device to the first target SOC value in step 42, the method provided by the present disclosure may further include the following steps:
comparing the SOC value currently displayed by the SOC display device with a second preset SOC value;
if the SOC value currently displayed by the SOC display device is smaller than a second preset SOC value, taking the second preset SOC value as a first target SOC value;
and if the SOC value currently displayed by the SOC display device is larger than or equal to the second preset SOC value, taking the third preset SOC value as the first target SOC value.
Considering that an error may occur in the ampere-hour integration method, if the first target SOC value is set to a certain value in advance (a second preset SOC value may be set in advance), a situation may occur in which the SOC value currently displayed by the SOC display device has reached the second preset SOC value when the real-time maximum voltage value reaches the first voltage threshold value, or a situation may occur in which the SOC value currently displayed by the SOC display device during charging has become higher than the second preset SOC value, and therefore, the first target SOC value may be determined in a dynamic manner.
As shown in the above steps, the SOC value currently displayed by the SOC display device is compared with the second preset SOC value, if the SOC value currently displayed by the SOC display device is smaller than the second preset SOC value, the second preset SOC value may be directly used as the first target SOC value, and if the SOC value currently displayed by the SOC display device is greater than or equal to the second preset SOC value, the third preset SOC value is used as the first target SOC value. The third preset SOC value is greater than the second preset SOC value and less than the second target SOC value, and the third preset SOC value may be set according to the SOC value currently displayed by the SOC display device, for example, the third preset SOC value may be set to (SOC value currently displayed by the SOC display device + 0.1%).
Optionally, before the SOC value currently displayed by the SOC display device is corrected to the second target SOC value in step 43, the method provided by the present disclosure may further include the following steps:
comparing the SOC value currently displayed by the SOC display device with a fourth preset SOC value;
if the SOC value currently displayed by the SOC display device is smaller than a fourth preset SOC value, taking the fourth preset SOC value as a second target SOC value;
and if the SOC value currently displayed by the SOC display device is greater than or equal to the fourth preset SOC value, taking the fifth preset SOC value as the first target SOC value.
Considering that an error may occur in the ampere-hour integration method, if the second target SOC value is set to a certain value in advance (a fourth preset SOC value may be set in advance), a situation may occur in which the SOC value currently displayed by the SOC display device has reached the fourth preset SOC value when the real-time maximum voltage value reaches the second voltage threshold value, or a situation may occur in which the SOC value currently displayed by the SOC display device during charging has become higher than the fourth preset SOC value, and therefore, the second target SOC value may be determined in a dynamic manner.
As shown in the above steps, the SOC value currently displayed by the SOC display device is compared with the fourth preset SOC value, if the SOC value currently displayed by the SOC display device is smaller than the fourth preset SOC value, the fourth preset SOC value may be directly used as the second target SOC value, and if the SOC value currently displayed by the SOC display device is greater than or equal to the fourth preset SOC value, the fifth preset SOC value may be used as the first target SOC value. The fifth preset SOC value is greater than the fourth preset SOC value and less than the third target SOC value, and the fifth preset SOC value may be set according to the SOC value currently displayed by the SOC display device, for example, the fifth preset SOC value may be set to (SOC value currently displayed by the SOC display device + 0.2%).
By the above manner, correction is started some time before the start of float charging, and the smoothness of the SOC curve before the end correction can be ensured.
Fig. 8 is a block diagram of an SOC correction apparatus for a power battery provided according to an embodiment of the present disclosure. As shown in fig. 8, the apparatus 50 may include:
the acquiring module 51 is used for acquiring an SOC actual value of the power battery under the condition that a power battery contactor is closed;
a first determination module 52 for determining an SOC display value corresponding to the SOC actual value;
a second determining module 53, configured to determine a correction factor according to a state parameter of the power battery, the SOC actual value, and the SOC display value, where the state parameter of the power battery is used to represent that the power battery is in a charging state or a discharging state, and the correction factor is used to determine an SOC correction rate;
and the correction module 54 is used for correcting the SOC of the power battery according to the correction factor.
Optionally, the first determining module 52 is configured to determine the SOC display value Ds corresponding to the SOC actual value Rs according to the following formula:
Figure BDA0002638949200000221
wherein Ws1 is the actual lower limit value of the SOC of the power battery, Ws2 is the actual upper limit value of the SOC of the power battery, M1 is the lower limit value of the SOC display of the power battery, and M2 is the upper limit value of the SOC display of the power battery.
Optionally, the second determining module 53 includes:
the first determining submodule is used for determining the correction factor as a first numerical value if the power battery is in a discharging state and the SOC display value is greater than the SOC actual value;
the second determining submodule is used for determining the correction factor as a second numerical value if the power battery is in a discharging state and the SOC display value is smaller than or equal to the SOC actual value;
the third determining submodule is used for determining the correction factor as a third numerical value if the power battery is in a charging state and the SOC display value is greater than the SOC actual value;
and the fourth determining submodule is used for determining the correction factor as a fourth numerical value if the power battery is in a charging state and the SOC display value is less than or equal to the SOC actual value.
Optionally, the first value K1 is determined by the following formula:
Figure BDA0002638949200000222
the second value K2 is determined by the following formula:
Figure BDA0002638949200000231
the third value K3 is determined by the following formula:
Figure BDA0002638949200000232
the fourth value K4 is determined by the following formula:
Figure BDA0002638949200000233
wherein Rs is the SOC actual value, Ds is the SOC display value, Ws1 is the SOC actual lower limit value of the power battery, and Ws2 is the SOC actual upper limit value of the power battery.
Optionally, the modification module 54 includes:
the obtaining submodule is used for obtaining an initial correction rate of the power battery;
a fifth determining submodule, configured to use a product of the initial correction rate and the correction factor as a target correction rate;
and the first correction submodule is used for correcting the SOC of the power battery according to the target correction rate.
Optionally, the modification module 54 further includes:
the sixth determining submodule is used for determining the maximum voltage value in the voltages of all the battery monomers in the power battery in real time if the power battery is in a charging state;
the second correction submodule is used for correcting the SOC value currently displayed by the SOC display device to a first target SOC value according to a first correction rate when the maximum voltage value reaches a first voltage threshold value;
the third correction submodule is used for correcting the SOC value currently displayed by the SOC display device to a second target SOC value according to a second correction rate when the maximum voltage value reaches a second voltage threshold value, wherein the second voltage threshold value is larger than the first voltage threshold value, and the second target SOC value is larger than the first target SOC value;
the fourth correction submodule is used for correcting the SOC value currently displayed by the SOC display device to a third target SOC value according to a third correction rate when the SOC value currently displayed by the SOC display device is larger than a first preset SOC value and the charging current of the power battery is smaller than a first current threshold value, wherein both the first preset SOC value and the third target SOC value are larger than the second target SOC value;
and the fifth correction submodule is used for correcting the SOC value currently displayed by the SOC display device to the SOC display upper limit value of the power battery according to a fourth correction rate when the maximum voltage value in the voltages of all the single batteries in the power battery reaches the second voltage threshold value and the charging current of the power battery is smaller than the second current threshold value.
Optionally, the modification module 54 is configured to: before the second correction submodule corrects the SOC value currently displayed by the SOC display device to the first target SOC value, the SOC value currently displayed by the SOC display device is compared with a second preset SOC value; if the SOC value currently displayed by the SOC display device is smaller than the second preset SOC value, taking the second preset SOC value as the first target SOC value; if the SOC value currently displayed by the SOC display device is larger than or equal to the second preset SOC value, taking a third preset SOC value as the first target SOC value, wherein the third preset SOC value is larger than the second preset SOC value and smaller than the second target SOC value;
alternatively, the modification module 54 is configured to: before the third correction submodule corrects the SOC value currently displayed by the SOC display device to the second target SOC value, the SOC value currently displayed by the SOC display device is compared with a fourth preset SOC value; if the SOC value currently displayed by the SOC display device is smaller than the fourth preset SOC value, taking the fourth preset SOC value as the second target SOC value; if the SOC value currently displayed by the SOC display device is larger than or equal to the fourth preset SOC value, taking a fifth preset SOC value as the first target SOC value, wherein the fifth preset SOC value is larger than the fourth preset SOC value and smaller than the third target SOC value.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the SOC correction method for a power battery according to any of the embodiments of the present disclosure.
The present disclosure also provides an electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the SOC correction method of the power battery according to any embodiment of the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A method for correcting SOC of a power battery is characterized by comprising the following steps:
under the condition that a power battery contactor is closed, acquiring an SOC actual value of the power battery;
determining an SOC display value corresponding to the SOC actual value;
determining a correction factor according to a state parameter of the power battery, the SOC actual value and the SOC display value, wherein the state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining an SOC correction rate;
and correcting the SOC of the power battery according to the correction factor.
2. The method of claim 1, wherein said determining a SOC display value corresponding to said actual value of SOC comprises:
an SOC display value Ds corresponding to the SOC actual value Rs is determined according to the following equation:
Figure FDA0002638949190000011
wherein Ws1 is the actual lower limit value of the SOC of the power battery, Ws2 is the actual upper limit value of the SOC of the power battery, M1 is the lower limit value of the SOC display of the power battery, and M2 is the upper limit value of the SOC display of the power battery.
3. The method of claim 1, wherein said determining a correction factor based on a state parameter of a power cell, said actual value of SOC and said SOC display value comprises:
if the power battery is in a discharging state and the SOC display value is larger than the SOC actual value, determining that the correction factor is a first numerical value;
if the power battery is in a discharging state and the SOC display value is smaller than or equal to the SOC actual value, determining the correction factor as a second numerical value;
if the power battery is in a charging state and the SOC display value is larger than the SOC actual value, determining that the correction factor is a third numerical value;
and if the power battery is in a charging state and the SOC display value is smaller than or equal to the SOC actual value, determining that the correction factor is a fourth numerical value.
4. The method of claim 3,
the first value K1 is determined by the following formula:
Figure FDA0002638949190000021
the second value K2 is determined by the following formula:
Figure FDA0002638949190000022
the third value K3 is determined by the following formula:
Figure FDA0002638949190000023
the fourth value K4 is determined by the following formula:
Figure FDA0002638949190000024
wherein Rs is the SOC actual value, Ds is the SOC display value, Ws1 is the SOC actual lower limit value of the power battery, and Ws2 is the SOC actual upper limit value of the power battery.
5. The method of claim 1, wherein the SOC correction of the power battery based on the correction factor comprises:
acquiring an initial correction rate of the power battery;
taking the product of the initial correction rate and the correction factor as a target correction rate;
and according to the target correction rate, performing SOC correction on the power battery.
6. The method of claim 5, wherein if the power cell is in a charging state, the method further comprises:
determining the maximum voltage value in the voltages of all battery monomers in the power battery in real time;
when the maximum voltage value reaches a first voltage threshold value, correcting the SOC value currently displayed by the SOC display device to a first target SOC value according to a first correction rate;
when the maximum voltage value reaches a second voltage threshold value, correcting the SOC value currently displayed by the SOC display device to a second target SOC value according to a second correction rate, wherein the second voltage threshold value is larger than the first voltage threshold value, and the second target SOC value is larger than the first target SOC value;
when the SOC value currently displayed by the SOC display device is larger than a first preset SOC value and the charging current of the power battery is smaller than a first current threshold value, correcting the SOC value currently displayed by the SOC display device to a third target SOC value according to a third correction rate, wherein both the first preset SOC value and the third target SOC value are larger than the second target SOC value;
and when the maximum voltage value in the voltages of all the single batteries in the power battery reaches the second voltage threshold value and the charging current of the power battery is smaller than the second current threshold value, correcting the SOC value currently displayed by the SOC display device to the SOC display upper limit value of the power battery according to a fourth correction rate.
7. The method of claim 6, wherein prior to the step of modifying the SOC value currently displayed by the SOC display device to the first target SOC value, the method further comprises:
comparing the SOC value currently displayed by the SOC display device with a second preset SOC value;
if the SOC value currently displayed by the SOC display device is smaller than the second preset SOC value, taking the second preset SOC value as the first target SOC value;
if the SOC value currently displayed by the SOC display device is larger than or equal to the second preset SOC value, taking a third preset SOC value as the first target SOC value, wherein the third preset SOC value is larger than the second preset SOC value and smaller than the second target SOC value;
alternatively, before the step of correcting the SOC value currently displayed by the SOC display device to the second target SOC value, the method further includes:
comparing the SOC value currently displayed by the SOC display device with a fourth preset SOC value;
if the SOC value currently displayed by the SOC display device is smaller than the fourth preset SOC value, taking the fourth preset SOC value as the second target SOC value;
if the SOC value currently displayed by the SOC display device is larger than or equal to the fourth preset SOC value, taking a fifth preset SOC value as the first target SOC value, wherein the fifth preset SOC value is larger than the fourth preset SOC value and smaller than the third target SOC value.
8. An apparatus for correcting SOC of a power battery, the apparatus comprising:
the acquisition module is used for acquiring the SOC actual value of the power battery under the condition that a power battery contactor is closed;
a first determination module for determining an SOC display value corresponding to the SOC actual value;
the second determination module is used for determining a correction factor according to a state parameter of the power battery, the SOC actual value and the SOC display value, wherein the state parameter of the power battery is used for representing that the power battery is in a charging state or a discharging state, and the correction factor is used for determining an SOC correction rate;
and the correction module is used for correcting the SOC of the power battery according to the correction factor.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
10. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 7.
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