CN112477695B - Battery management method and battery management system - Google Patents

Battery management method and battery management system Download PDF

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Publication number
CN112477695B
CN112477695B CN202011299112.3A CN202011299112A CN112477695B CN 112477695 B CN112477695 B CN 112477695B CN 202011299112 A CN202011299112 A CN 202011299112A CN 112477695 B CN112477695 B CN 112477695B
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battery
soc value
value
display
soc
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CN112477695A (en
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吴文臣
肖洋
侯卫国
钱立冬
何翔宇
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Shanghai Yingheng Electronic Co ltd
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Shanghai Yingheng Electronic Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [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 embodiment of the invention discloses a battery management method and a battery management system. The battery management method comprises the following steps: acquiring a working mode of a battery; if the battery is in a charging mode, updating the display SOC value of the battery according to the current working voltage of the battery and the corresponding relation between the preset battery charging stage and the display SOC value; and if the battery is in a driving mode, updating the display SOC value of the battery according to the real SOC value of the battery and the current value of the battery, wherein the real SOC value is determined by an ampere-hour integration method. According to the battery management method provided by the embodiment of the invention, the battery management system acquires the working mode of the battery, and different strategies are correspondingly used according to different working modes to reflect the residual electric quantity of the battery, so that the problem of inaccurate estimation of the display SOC value of the battery in the prior art is solved, and the display accuracy of the SOC value of the battery is improved.

Description

Battery management method and battery management system
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a battery management method and a battery management system.
Background
With the gradual popularization of the pure electric vehicle, the 'cruising anxiety' of the pure electric vehicle in the use process is always the focus of attention of common users. The SOC (state of charge) of the battery is the most intuitive performance for representing the current battery endurance. In the use process of the battery, due to the fact that the battery is aged or is in other extreme working conditions, the voltage collected by the battery is inaccurate, particularly, an SOC value calculated by using an ampere-hour integration method can accumulate errors for a long time in the driving process, the SOC value calculated by a battery management system can jump greatly, the estimation is inaccurate, and the like, so that the user experience is seriously influenced.
The current solutions to the above problems are mainly achieved by the following two approaches: 1. a more complex and accurate algorithm is used to improve the estimation accuracy of the SOC; 2. using a dual SOC estimation strategy, a display SOC is established to characterize the current SOC value. For the first category of methods, the embedded controller has limited computing power and requires accurate battery data using more complex algorithms that are distorted and less reliable as the battery ages. For the second kind of methods, the current mainstream method is to divide the display SOC interval into 5% -95% or 10% -90%, and establish a smooth SOC estimation strategy. The method can simply and effectively represent the current SOC value, only change the change rate of the SOC, and can not directly change the change amplitude of the SOC value, and the SOC value tends to be stable in a short time. This method is also based on the algorithm of SOC itself, and during the charging process, although SOC has been shown to be 100% due to the accumulated error and the influence of the internal resistance of the battery, the battery is not fully charged.
In summary, the two currently adopted SOC estimation methods have the defect that SOC display is inaccurate.
Disclosure of Invention
The embodiment of the invention provides a battery management method and a battery management system, which aim to improve the accuracy of battery SOC display.
In a first aspect, an embodiment of the present invention provides a battery management method, including:
acquiring a working mode of a battery;
if the battery is in a charging mode, updating the display SOC value of the battery according to the current working voltage of the battery and the corresponding relation between the preset battery charging stage and the display SOC value;
and if the battery is in a driving mode, updating the display SOC value of the battery according to the real SOC value of the battery and the current value of the battery, wherein the real SOC value is determined by an ampere-hour integration method.
In a second aspect, an embodiment of the present invention further provides a battery management system, including:
the working mode acquisition module is used for acquiring the working mode of the battery;
the first display SOC value updating module is used for updating the display SOC value of the battery according to the current working voltage of the battery and the corresponding relation between the preset battery charging stage and the display SOC value if the battery is in a charging mode;
and the second display SOC value updating module is used for updating the display SOC value of the battery according to the real SOC value of the battery and the current value of the battery if the battery is in a driving mode, wherein the real SOC value is determined by an ampere-hour integration method.
According to the battery management method provided by the embodiment of the invention, the battery management system acquires the working mode of the battery, and when the battery is in the charging mode, the display SOC value of the battery is updated in real time by acquiring the current working voltage of the battery and based on the corresponding relation between the current working voltage and the preset battery charging stage and the display SOC value; when the battery is judged to be in the driving mode, the battery management system further judges the current value of the battery to determine whether the energy recovery exists in the battery at present, and then updates the display SOC value of the battery in real time according to the real SOC value of the battery and the current value of the battery, so that the display SOC value of the battery can truly reflect the actual electric quantity of the battery. According to the battery management method provided by the embodiment of the invention, the working mode of the battery is obtained, and different strategies are correspondingly used according to different working modes to reflect the residual electric quantity of the battery, so that the problem of inaccurate estimation of the display SOC value of the battery in the prior art is solved, and the display accuracy of the SOC value of the battery is improved.
Drawings
Fig. 1 is a flowchart of a battery management method according to an embodiment of the present invention;
FIG. 2 is a flow chart of another battery management method provided by an embodiment of the invention;
FIG. 3 is a flow chart of another battery management method provided by an embodiment of the invention;
fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a battery management method according to an embodiment of the present invention, where the battery management method is applicable to managing displayed electric quantity of a battery, so that the displayed electric quantity of the battery at different stages can truly reflect actual electric quantity of the battery, and thus electric quantity information of the battery is accurately displayed. The battery management method may be performed by a battery management system, and referring to fig. 1, the battery management method includes the steps of:
and S110, acquiring the working mode of the battery.
The working mode of the battery comprises a charging mode and a driving mode. After the battery management system is powered on, the battery management system determines whether the battery is currently in a charging mode or a driving mode.
And S120, if the battery is in the charging mode, updating the display SOC value of the battery according to the current working voltage of the battery and the corresponding relation between the preset battery charging stage and the display SOC value.
The battery management system can acquire the current working voltage of the battery in real time through a built-in voltage acquisition circuit.
And the charging stage of the battery is divided according to the quick charging current spectrum of the battery. Before the battery is charged, the charging process of the battery can be divided into a plurality of charging stages according to the battery quick charging current spectrum, and each charging stage corresponds to a charging platform voltage.
The charging platform voltage is used for the battery management system to adjust the charging current of the battery in real time, so that the charging voltage of the battery does not exceed the corresponding charging platform voltage in each charging stage. If the voltage of the battery reaches the charging platform voltage under the current charging current, the battery management system reduces the charging current and enters the next charging stage so as to control the charging current to continue charging according to the charging platform voltage not exceeding the next charging stage. And the battery management system controls the charging current according to the method until the charging is finished.
The display SOC (State of Charge) value of the battery is used for displaying the residual capacity of the battery. The display SOC value in this embodiment may be obtained by calculating a working voltage value of the battery, specifically, the open-circuit voltage of the battery may be obtained by calculating the working voltage of the battery, and then the display SOC value of the battery may be obtained based on the electrical core characteristic table of the battery, so as to establish a corresponding relationship between the charging stage of the battery and the display SOC value.
It should be noted that, in the present embodiment, the displayed SOC value at each charging stage is related to the cell temperature of the battery, and thus the cell parameter in the present embodiment at least needs to include the cell temperature.
In this embodiment, the battery management system updates the display SOC value of the battery by acquiring the operating voltage of the battery in real time and based on the acquired operating voltage of the battery and the corresponding relationship between the preset battery charging stage and the display SOC value, so that the display SOC value of the battery is changed along with the remaining capacity of the battery in the charging stage, and the remaining capacity value of the battery in the current state is truly reflected.
And S130, if the battery is in the driving mode, updating the display SOC value of the battery according to the real SOC value of the battery and the current value of the battery.
Wherein, the real SOC value is determined by an ampere-hour integration method.
The current value of the battery is used to characterize whether the battery currently has energy recovery. When the current value of the battery is positive, the battery does not have energy recovery currently; when the current value of the battery is negative, energy recovery currently exists in the battery.
In the embodiment, the battery management system updates the display SOC value of the battery based on the real SOC value of the battery according to different following strategies by judging whether the energy recovery exists in the battery, so that the display SOC value of the battery can reflect the real SOC value of the battery without distortion, and the accuracy of displaying the SOC value is improved.
The working principle of the battery management method provided by the embodiment of the invention is as follows: different updating strategies are set for the display SOC value of the battery according to the working mode of the battery, so that the display SOC value of the battery can be controlled to truly reflect the actual SOC value of the battery under different working modes.
According to the battery management method provided by the embodiment of the invention, the battery management system acquires the working mode of the battery, and when the battery is in the charging mode, the battery management system updates the display SOC value of the battery in real time by acquiring the current working voltage of the battery and based on the corresponding relation between the current working voltage and the preset battery charging stage and the display SOC value; when the battery is judged to be in the driving mode, the battery management system further judges the current value of the battery to determine whether the battery has energy recovery currently, and then updates the display SOC value of the battery in real time according to the real SOC value of the battery and the current value of the battery, so that the display SOC value of the battery can truly reflect the actual electric quantity of the battery. According to the battery management method provided by the embodiment of the invention, the working mode of the battery is obtained, and different strategies are correspondingly used according to different working modes to display the residual electric quantity of the battery, so that the problem of inaccurate estimation of the display SOC value of the battery in the prior art is solved, and the display accuracy of the SOC value of the battery is improved.
Optionally, on the basis of the above technical solution, when the battery is powered on to operate, the battery management system needs to correct an initial SOC value of the battery, and accordingly, before acquiring the operating mode of the battery, the battery management method further includes:
acquiring the last power-off time of the battery;
and determining the initial SOC value of the battery according to the last power-off time and a preset standing time threshold value.
Specifically, the battery management system can calculate the actual standing time of the battery according to the recorded last power-off time of the battery, so that the initial SOC value of the battery is corrected according to the calculated actual standing time.
In one embodiment, the above process of correcting the initial SOC value of the battery may be specifically optimized as follows:
determining the actual standing time of the battery according to the last power-off time;
comparing the actual standing time with a preset standing time threshold;
if the actual standing time is larger than the standing time threshold, determining the open-circuit voltage of the battery according to the current working voltage of the battery, and determining the initial SOC value of the battery according to the open-circuit voltage and the corresponding relation between the preset open-circuit voltage and the SOC value;
and if the actual standing time is less than the standing time threshold, taking the real SOC value corresponding to the last power-off time as the initial SOC value of the battery.
Specifically, if the actual standing time is greater than the standing time threshold, it indicates that the standing time of the battery is long, and the residual electric quantity of the battery estimated by the ampere-hour integration is inaccurate, and at this time, the battery management system determines the initial SOC value of the battery by using the SOC-OCV curve of the battery, thereby completing the correction of the initial SOC value of the battery.
And when the actual standing time is smaller than the standing time threshold, the battery standing time is short, and at the moment, the battery management system finishes the correction of the initial SOC value of the battery by acquiring the real SOC value of the battery when the battery is powered off last time as the initial SOC value of the battery.
Optionally, when the battery is powered on, the battery management system further obtains a display SOC value corresponding to the last power-off time of the stored battery, uses the display SOC value as a display SOC initial value of the battery at the current time, and updates the display SOC value of the battery in real time through the update policy for displaying the SOC value provided in this embodiment based on the display SOC initial value.
Optionally, fig. 2 is a flowchart of another battery management method provided in an embodiment of the present invention, which is further optimized based on the foregoing embodiment, and referring to fig. 2, the battery management method specifically includes:
and S210, acquiring the working mode of the battery.
And S220, if the battery is in the charging mode, determining the current charging stage of the battery according to the current working voltage of the battery.
The current working voltage of the battery refers to the real-time charging voltage of the battery in the charging process.
According to the embodiment, in the process of charging the battery, the charging process of the battery is divided into different charging stages according to the quick charging current spectrum of the battery, each charging stage corresponds to one charging platform voltage, and the battery management system adjusts the charging current at each charging platform of the battery so as to control the charging voltage not to exceed the charging platform voltage corresponding to the current charging stage. Therefore, in each charging stage, the voltage value of the battery is also changed, and the battery management system detects the working voltage of the battery in the charging process in real time so as to determine the current charging stage of the battery according to the obtained current working voltage.
And S230, updating the display SOC value of the battery according to the current charging stage of the battery and the corresponding relation between the preset charging stage of the battery and the display SOC value.
In one embodiment, the correspondence between the preset battery charging stage and the displayed SOC value may be determined by the following method:
determining the open-circuit voltage of the battery in each charging stage according to the charging platform voltage of the battery in each charging stage and the battery core parameters of the battery and the following formula, wherein the charging stage of the battery is divided according to the fast charging current spectrum of the battery;
OCV SOC，temp ＝U SOC，temp +I*DCR temp，SOH (1)
in the formula: OCV SOC，temp Is open circuit voltage, U SOC，temp Working voltages corresponding to different temperatures and SOC values in a fast charging current spectrum, I is charging current, DCR temp，SOH Feeding back internal resistance for pulses corresponding to different temperatures and SOC values;
and determining the display SOC value of the battery in each charging stage according to the open-circuit voltage so as to determine the corresponding relation between the charging stage of the battery and the display SOC value.
Specifically, there is a correspondence relationship between the open-circuit voltage of the battery and the SOC value of the battery, i.e., an SOC-OCV curve. Therefore, after the open-circuit voltage of the battery is obtained, the corresponding display SOC value can be calculated based on the SOC-OCV curve of the battery, and the corresponding relation between the charging stage of the battery and the display SOC value is established.
In this embodiment, since the SOC-OCV curve (the corresponding relationship between the SOC value and the open-circuit voltage) does not change much after the battery ages, and the internal resistance of the battery gradually increases after the battery ages, the present embodiment only considers the influence of the battery aging on the internal resistance of the battery, that is, the open-circuit voltage of the battery is estimated through the charging platform voltage of the battery, and then the display SOC value of the battery is determined by the open-circuit voltage.
And S230, if the battery is in the driving mode, determining a target SOC value of the battery according to the real SOC value of the battery according to a preset corresponding relation.
Wherein, the real SOC value is determined by an ampere-hour integration method.
The battery management system calculates the target SOC value of the battery in real time based on the real SOC value through a preset smoothing strategy so as to ensure that the target SOC value of the battery changes smoothly. The battery management system determines the display SOC value of the battery at the next moment in real time by following the target SOC value, so that the display SOC value of the battery can be smoothly changed by smoothing the real SOC value of the battery and controlling the display SOC value of the battery to be adjusted along with the target SOC value, and sudden change of the display SOC value is avoided.
And S240, updating the display SOC value of the battery according to the target SOC value and the current value of the battery.
After the target SOC value of the battery is determined, the battery management system determines the following multiplying power according to whether energy recovery exists in the battery at present or not so as to control the display SOC value of the battery to follow the target SOC value until the display SOC value of the battery approaches the target SOC value of the battery, and at the moment, the display SOC value can really represent the actual electric quantity of the battery.
Judging whether the current value of the battery is positive or not;
if the current value of the battery is positive, comparing the current SOC display value of the battery with a target SOC value, and if the current SOC display value is larger than the target SOC value, determining the SOC display value of the battery at the next moment according to the target SOC value on the basis of a first following multiplying factor until the display SOC value of the battery approaches the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the SOC value of the battery at the next moment according to the target SOC value and based on the second following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery;
if the current value of the battery is negative, comparing the current SOC display value of the battery with the target SOC value, and if the current SOC display value is larger than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the second following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the first following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery.
Specifically, the first following magnification is larger than 1C, and the second following magnification is smaller than 1C, for example, the first following magnification is set to 2C, and the second following magnification is set to 0.5C. Setting a first following multiplying power to control the change rate of the display SOC value of the battery to be larger than the change rate of the target SOC value of the battery when the target SOC value of the battery is smaller so as to control the display SOC value to quickly approach the target SOC value; likewise, by setting the second following magnification, the variation rate of the display SOC value of the battery is controlled to be smaller than the variation rate of the target SOC value of the battery as the target SOC value of the battery increases, so that the display SOC value is controlled to quickly approach the target SOC value.
For example, at a certain moment, the display SOC value of the battery is 80%, the target SOC value is 50%, if the battery does not currently have energy recovery, the target SOC value of the battery is lower and lower, and at this moment, the display SOC value follows the target SOC value according to the first following magnification so as to quickly approach the target SOC value; on the contrary, if the energy recovery exists in the battery at present, the target SOC value of the battery is larger and larger, and at the moment, the display SOC value follows the target SOC value according to the second following multiplying power so as to approach the target SOC value quickly.
It should be noted that, regardless of whether the target SOC value of the battery is followed by using the first following magnification or the second following magnification, when the displayed SOC value of the battery approaches the target SOC value of the battery, the battery management system stops following the target SOC value by using the first following magnification or the second following magnification, and controls the displayed SOC value to follow the target SOC value by using the 1C following magnification, so that the displayed SOC value truly represents the current electric quantity of the battery.
According to the embodiment of the invention, the working mode of the battery is judged, when the battery is in the charging mode, the battery management system determines the current charging stage of the battery according to the current working voltage of the battery, and then the display SOC value of the battery is updated in real time according to the corresponding relation between the current working stage and the preset battery charging stage and the display SOC value. When the battery is in a driving mode, the battery management system carries out smoothing processing on the real SOC value of the battery to obtain a target SOC value of the battery, and then judges whether the energy recovery exists in the battery or not through the current value of the battery, so that the following multiplying power of the change of the display SOC value of the battery along with the target SOC value is determined, the display SOC value of the battery is controlled to approach the target SOC value of the battery, and the current electric quantity of the battery is reflected really. According to the embodiment of the invention, the target SOC value which changes smoothly is obtained by smoothing the real SOC value, so that the display SOC value of the battery is controlled to change smoothly along with the target SOC value, the display SOC value of the battery can be prevented from jumping when the battery is in a formed state, and the display SOC value of the battery is changed along with the target SOC value of the battery by adopting a following strategy, so that the display SOC value of the battery can truly reflect the electric quantity information of the battery.
Optionally, fig. 3 is a flowchart of another battery management method provided in an embodiment of the present invention, and referring to fig. 3, the method specifically includes:
s310, obtaining parameters of a battery cell data table, a fast charging current spectrum and an SOC-OCV curve.
In some embodiments, before obtaining the cell data table parameters, the battery management system further needs to set a final error and a single SOC accumulation amount of the iterative function to establish the iterative function.
And S320, whether all temperature intervals are traversed or not.
The step is used for solving the display SOC values corresponding to the charging platform voltage points at different temperatures.
If yes, go to step S330; otherwise, the process returns to step S310 to enter the next temperature point.
And S330, acquiring the SOC value corresponding to each voltage platform.
Each charging stage corresponds to one voltage platform, and the step is to obtain a display SOC value corresponding to each charging stage.
And S340, the BMS starts working, and the SOC _ R is estimated through ampere-hour integration.
The SOC _ R is the true SOC value of the battery, and the SOC _ R is used for smoothing in the subsequent steps to obtain the smoothed SOC _ D.
And S350, judging whether the SOC is more than the standing time.
If yes, go to step S351;
otherwise, step S352 is executed.
S351, an initial value SOC _ init is obtained by using the SOC _ OCV.
And S352, using the SOC value stored last time as an initial value SOC _ init.
And correcting the initial value SOC _ init through the steps.
And S360, judging the working mode.
If the battery is currently in the charging mode, go to step S361;
if the battery is currently in the driving mode, step S362 is executed.
S361、SOC_F＝SOC_C。
In the charging process, the battery management system updates the display SOC _ F of the battery according to the current working voltage of the battery and the corresponding relation between the preset battery charging stage and the display SOC value.
S362, establishing a smooth relation; SOC _ D ═ F (SOC _ R); the following magnifications k1 and k2 are set.
The battery management system determines a smoothed SOC _ D based on the SOC _ R estimated by time integration through smoothing calculation, and further determines a display SOC _ F of the battery by following the smoothed SOC _ D with the set following magnification.
S370, whether the current value is positive or not is judged.
If the current value is positive, it indicates that the battery has no energy recovery, and then step S371 is executed;
if the current value is negative, it indicates that there is energy recovery from the battery, and step S372 is executed.
S371、SOC_F＞SOC_D。
This step is used for judging whether the display SOC value at the present time is larger than the target SOC value at the present time.
If SOC _ F > SOC _ D, go to step S380;
otherwise, if SOC _ F < SOC _ D, go to step S390.
S372、SOC_F＞SOC_D。
This step is used for judging whether the display SOC value at the present time is larger than the target SOC value at the present time.
If SOC _ F is greater than SOC _ D, go to step S390;
otherwise, if SOC _ F < SOC _ D, go to step S380.
And S380, obtaining the SOC _ F of the next moment based on the current SOC _ D by using the first following multiplying power.
And S390, obtaining the SOC _ F of the next moment based on the current SOC _ D following by using the second following multiplying power.
Optionally, fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present invention, where the battery management system 40 may be used to accurately estimate a display SOC value of a battery, so as to accurately display a remaining power of the battery and prevent a display power of the battery from jumping. Referring to fig. 4, the battery management system 40 includes: an operation mode acquisition module 410, a first display SOC value update module 420, and a second display SOC value update module 430, wherein,
an operation mode obtaining module 410, configured to obtain an operation mode of the battery;
a first display SOC value updating module 420, configured to update the display SOC value of the battery according to a current working voltage of the battery and a preset corresponding relationship between a battery charging stage and the display SOC value if the battery is in a charging mode;
and a second display SOC value updating module 430, configured to update the display SOC value of the battery according to the actual SOC value of the battery and the current value of the battery if the battery is in the driving mode, where the actual SOC value is determined by an ampere-hour integration method.
Optionally, on the basis of the foregoing technical solution, the first display SOC value updating module 420 includes:
the charging stage determining unit is used for determining the current charging stage of the battery according to the current working voltage of the battery if the battery is in a charging mode;
and the first display SOC value updating unit is used for updating the display SOC value of the battery according to the current charging stage of the battery and the corresponding relation between the preset charging stage of the battery and the display SOC value.
Optionally, on the basis of the foregoing technical solution, the first display SOC value updating module 420 is further configured to:
determining the open-circuit voltage of the battery in each charging stage according to the charging platform voltage of the battery in each charging stage and the battery core parameters of the battery and the following formula, wherein the charging stage of the battery is divided according to the fast charging current spectrum of the battery;
OCV SOC，temp ＝U SOC，temp +I*DCR temp，SOH (1)
in the formula: OCV SOC，temp Is open circuit voltage, U SOC，temp Working voltages corresponding to different temperatures and SOC values in a fast charging current spectrum, I is charging current, DCR temp，SOH Feeding back internal resistance for pulses corresponding to different temperatures and SOC values;
and determining the display SOC value of the battery in each charging stage according to the open-circuit voltage so as to determine the corresponding relation between the charging stage of the battery and the display SOC value.
Optionally, on the basis of the foregoing technical solution, the second display SOC value updating module 430 includes:
the target SOC value determining unit is used for determining a target SOC value of the battery according to a preset corresponding relation and a real SOC value of the battery if the battery is in a driving mode;
and the second display SOC value updating unit is used for updating the display SOC value of the battery according to the target SOC value and the current value of the battery.
Optionally, on the basis of the above technical solution, the second display SOC value updating unit is specifically configured to:
judging whether the current value of the battery is positive or not;
if the current value of the battery is positive, comparing the current SOC display value of the battery with a target SOC value, and if the current SOC display value is larger than the target SOC value, determining the SOC display value of the battery at the next moment according to the target SOC value and based on a first following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the SOC value of the battery at the next moment according to the target SOC value and based on the second following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery;
if the current value of the battery is negative, comparing the current SOC display value of the battery with the target SOC value, and if the current SOC display value is larger than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the second following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the first following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery.
Optionally, on the basis of the above technical solution, the battery management system 40 further includes:
the power-off time management module is used for acquiring the last power-off time of the battery;
and the SOC initial value determining module is used for determining the SOC initial value of the battery according to the last power-off time and a preset standing time threshold value.
Optionally, on the basis of the above technical solution, the SOC initial value determining module includes:
the standing time determining unit is used for determining the actual standing time of the battery according to the last power-off time;
the comparison unit is used for comparing the actual standing time with a preset standing time threshold;
the first SOC initial value determining unit is used for determining the open-circuit voltage of the battery according to the current working voltage of the battery and determining the SOC initial value of the battery according to the open-circuit voltage and the corresponding relation between the preset open-circuit voltage and the SOC value if the actual standing time is larger than the standing time threshold;
and the second initial SOC value determining unit is used for taking the real SOC value corresponding to the last power-off time as the initial SOC value of the battery if the actual standing time is less than the standing time threshold.
The battery management system provided by the embodiment of the invention can execute the battery management method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. Reference may be made to the description in the method embodiments of the invention for details not explicitly described in this embodiment.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (5)

1. A battery management method, comprising:
acquiring a working mode of a battery;
if the battery is in a charging mode, updating the display SOC value of the battery according to the current working voltage of the battery and the corresponding relation between the preset battery charging stage and the display SOC value;
if the battery is in a charging mode, determining the current charging stage of the battery according to the current working voltage of the battery;
updating the display SOC value of the battery according to the corresponding relation between the current charging stage of the battery and a preset battery charging stage and the display SOC value;
if the battery is in a driving mode, updating a display SOC value of the battery according to a real SOC value of the battery and a current value of the battery, wherein the real SOC value is determined by an ampere-hour integration method;
wherein, if the battery is in a driving mode, updating the display SOC value of the battery according to the real SOC value of the battery and the current value of the battery, and the method comprises the following steps:
if the battery is in a driving mode, determining a target SOC value of the battery according to a preset corresponding relation and the real SOC value of the battery;
judging whether the current value of the battery is positive or not;
if the current value of the battery is positive, comparing the current SOC display value of the battery with the target SOC value, and if the current SOC display value is larger than the target SOC value, determining the SOC display value of the battery at the next moment according to the target SOC value and based on a first following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the SOC value of the battery at the next moment according to the target SOC value and based on a second following multiplying power until the display SOC value of the battery approaches the target SOC value of the battery;
if the current value of the battery is negative, comparing the current SOC display value of the battery with the target SOC value, and if the current SOC display value is larger than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the second following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the first following multiplying power until the display SOC value of the battery approaches the target SOC value of the battery.
2. The battery management method according to claim 1, wherein the correspondence between the preset battery charging stage and the display SOC value is determined by:
determining the open-circuit voltage of the battery in each charging stage according to the charging platform voltage of the battery in each charging stage and the battery core parameters of the battery according to the following formula, wherein the charging stage of the battery is divided according to the fast charging current spectrum of the battery;
OCV SOC，temp ＝U SOC，temp +I*DCR temp，SOH (1)
in the formula: OCV SOC，temp Is open circuit voltage, U SOC，temp Working voltages corresponding to different temperatures and SOC values in a fast charging current spectrum, I is a charging current,DCR temp，SOH feeding back internal resistance for pulses corresponding to different temperatures and SOC values;
and determining the display SOC value of the battery in each charging stage according to the open-circuit voltage so as to determine the corresponding relation between the charging stage of the battery and the display SOC value.
3. The battery management method of claim 1, wherein prior to the obtaining the operating mode of the battery, the method further comprises:
acquiring the last power-off time of the battery;
and determining the initial SOC value of the battery according to the last power-off time and a preset standing time threshold value.
4. The battery management method according to claim 3, wherein the determining an initial SOC value of the battery according to the last power-off time and a preset standing time threshold comprises:
determining the actual standing time of the battery according to the last power-off time;
comparing the actual standing time with the preset standing time threshold;
if the actual standing time is larger than the standing time threshold, determining the open-circuit voltage of the battery according to the current working voltage of the battery, and determining the initial SOC value of the battery according to the corresponding relation between the open-circuit voltage and a preset open-circuit voltage and SOC value;
and if the actual standing time is smaller than the standing time threshold, taking the actual SOC value corresponding to the last power-off time as the initial SOC value of the battery.
5. A battery management system, comprising:
the working mode acquisition module is used for acquiring the working mode of the battery;
the first display SOC value updating module is used for updating the display SOC value of the battery according to the current working voltage of the battery and the corresponding relation between the preset battery charging stage and the display SOC value if the battery is in a charging mode;
the charging stage determining unit is used for determining the current charging stage of the battery according to the current working voltage of the battery if the battery is in a charging mode;
the first display SOC value updating unit is used for updating the display SOC value of the battery according to the corresponding relation between the current charging stage of the battery and a preset battery charging stage and the display SOC value;
the second display SOC value updating module is used for updating the display SOC value of the battery according to the real SOC value of the battery and the current value of the battery if the battery is in a driving mode, wherein the real SOC value is determined by an ampere-hour integration method;
the target SOC value determining unit is used for determining a target SOC value of the battery according to a preset corresponding relation and a real SOC value of the battery if the battery is in a driving mode;
a second display SOC value updating unit for updating the display SOC value of the battery according to the target SOC value and the current value of the battery;
judging whether the current value of the battery is positive or not;
if the current value of the battery is positive, comparing the current SOC display value of the battery with the target SOC value, and if the current SOC display value is larger than the target SOC value, determining the SOC display value of the battery at the next moment according to the target SOC value and based on a first following multiplying factor until the display SOC value of the battery approaches the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the SOC value of the battery at the next moment according to the target SOC value and based on a second following multiplying power until the display SOC value of the battery approaches the target SOC value of the battery;
if the current value of the battery is negative, comparing the current SOC display value of the battery with the target SOC value, and if the current SOC display value is larger than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the second following multiplying power until the display SOC value of the battery approaches to the target SOC value of the battery; otherwise, if the current SOC display value is smaller than the target SOC value, determining the display SOC value of the battery at the next moment according to the target SOC value and based on the first following multiplying power until the display SOC value of the battery approaches the target SOC value of the battery.
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