CN114655068B - Electric quantity balance control method and device - Google Patents
Electric quantity balance control method and device Download PDFInfo
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- CN114655068B CN114655068B CN202011552140.1A CN202011552140A CN114655068B CN 114655068 B CN114655068 B CN 114655068B CN 202011552140 A CN202011552140 A CN 202011552140A CN 114655068 B CN114655068 B CN 114655068B
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- 238000010248 power generation Methods 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
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- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
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Classifications
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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
-
- 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]
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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
- B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
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- 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
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The method is used for acquiring the SOC value of the power battery and the battery core attenuation coefficient of the power battery, reducing the SOC balance control window according to the battery core attenuation coefficient, and finally comparing the relation between the SOC value of the power battery and the reduced SOC balance control window to determine the working mode of the vehicle. Compared with the prior art that the SOC value of the power battery and the constant SOC balance control window are combined to determine the working mode of the vehicle, the electric quantity balance control method provided by the invention dynamically adjusts the SOC balance control window, so that the determined working mode of the vehicle is more attached to the actual state of the power battery, the fuel economy of the vehicle can be effectively improved, meanwhile, the charging and discharging time of the power battery is more reasonable, and the service life of the power battery can be prolonged.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to an electric quantity balance control method and device.
Background
The hybrid electric vehicle is a vehicle using a conventional internal combustion engine (diesel engine or gasoline engine) and an electric motor as power sources. The internal combustion engine adopts diesel oil or gasoline as fuel, and the electric energy of the motor operation is derived from a power battery arranged in the vehicle.
The oil-electricity hybrid electric vehicle adopts two power sources, reasonably selects the power sources and switches the working modes of the vehicle so as to realize electric quantity balance control. Through the electric quantity balance control, the technical advantage of low energy consumption of the new energy automobile can be fully exerted, so that the fuel consumption of the automobile is in an optimal range, and meanwhile, the service life of the power battery is reduced to the minimum extent.
In view Of the above, how to provide a method and an apparatus for controlling electric quantity balance, which reasonably select a working mode Of a vehicle, and control an SOC (State Of Charge) value Of a power battery, so as to improve fuel economy Of the vehicle, and delay attenuation Of service life Of the power battery, which is one Of technical problems to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a device for controlling electric quantity balance, which reasonably select a working mode of a vehicle, and control an SOC value of a power battery to improve fuel economy of the vehicle, and delay attenuation of service life of the power battery, and specifically adopts the following scheme:
in a first aspect, the present invention provides a method for controlling electric quantity balance, including:
acquiring a state of charge (SOC) value of a power battery and a battery core attenuation coefficient of the power battery;
reducing an SOC balance control window according to the battery core attenuation coefficient;
comparing the relation between the power battery SOC value and the reduced SOC balance control window, and determining a vehicle working mode;
wherein, according to the battery core attenuation coefficient, the reducing the SOC balance control window includes:
dividing a preset SOC lower limit threshold by the battery cell attenuation coefficient to obtain a first quotient;
updating the preset SOC lower limit threshold value to the first quotient value;
multiplying the preset SOC upper limit threshold value by the battery core attenuation coefficient to obtain a first product value;
and updating the preset SOC upper limit threshold value to the first product value.
Optionally, the method for controlling electric quantity balance provided by the invention further comprises the following steps:
counting a first time length;
and when the first time length reaches a preset time length threshold value, executing the step of acquiring the SOC value of the power battery and the battery cell attenuation coefficient of the power battery, and reckoning the first time length after reducing the SOC balance control window.
Optionally, the method for controlling electric quantity balance provided in the first aspect of the present invention further includes:
counting the driving mileage of the vehicle;
and when the vehicle driving mileage reaches a preset mileage threshold, executing the step of acquiring the state of charge (SOC) value of the power battery and the battery core attenuation coefficient of the power battery, and reckoning the vehicle driving mileage after reducing the SOC balance control window.
Optionally, the acquiring the SOC value includes:
acquiring an open-circuit voltage of the power battery;
and combining a first preset algorithm, and estimating the SOC value of the power battery according to the open-circuit voltage.
Optionally, the acquiring the SOC value includes:
obtaining an output current value of the power battery;
and combining a second preset algorithm, and estimating the SOC value of the power battery according to the output current value.
Optionally, the obtaining the cell attenuation coefficient of the power battery includes:
calculating the current cell resistance value of the power battery;
and determining the cell attenuation coefficient of the power battery according to the current cell resistance value and the calibrated cell resistance value of the power battery.
In a second aspect, the present invention provides an electric quantity balance control device, including:
the power battery comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a state of charge (SOC) value of a power battery and a cell attenuation coefficient of the power battery;
the adjusting unit is used for reducing the SOC balance control window according to the battery core attenuation coefficient;
the determining unit is used for comparing the relation between the SOC value of the power battery and the reduced SOC balance control window and determining a vehicle working mode;
the adjusting unit is configured to reduce an SOC balance control window according to the cell attenuation coefficient, and specifically includes:
dividing a preset SOC lower limit threshold by the battery cell attenuation coefficient to obtain a first quotient;
updating the preset SOC lower limit threshold value to the first quotient value;
multiplying the preset SOC upper limit threshold value by the battery core attenuation coefficient to obtain a first product value;
and updating the preset SOC upper limit threshold value to the first product value.
Based on the technical scheme, the electric quantity balance control method and the electric quantity balance control device provided by the invention are based on the battery core attenuation coefficient of the power battery, and the SOC balance control window is reduced in combination with the actual condition of the power battery, so that the updated control range is more attached to the current state of the power battery, and meanwhile, the SOC value of the power battery is obtained, and the working mode of the vehicle is determined in combination with the SOC value and the relationship between the reduced SOC balance control window. Compared with the prior art that the SOC value of the power battery and the constant SOC balance control window are combined to determine the working mode of the vehicle, the electric quantity balance control method provided by the invention dynamically adjusts the SOC balance control window, so that the determined working mode of the vehicle is more attached to the actual state of the power battery, the fuel economy of the vehicle can be effectively improved, meanwhile, the charging and discharging time of the power battery is more reasonable, and the service life of the power battery can be prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for controlling electric quantity balance according to an embodiment of the present invention;
fig. 2 is a block diagram of a power balance control device according to an embodiment of the present invention;
FIG. 3 is a block diagram of another power balance control device according to an embodiment of the present invention;
fig. 4 is a block diagram of another power balance control device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to fully exert the technical advantage of low energy consumption of the hybrid electric vehicle, the vehicle is provided with different working modes, such as a pure electric driving mode, a hybrid power assisting mode and the like, so that the internal combustion engine and the motor are mutually matched in the working process, and the energy consumption is reduced as much as possible. In practical application, the oil-electric hybrid electric vehicle determines the working mode of the vehicle according to the relation between the SOC value of the power battery and a preset SOC balance control window. In general, when the SOC value is lower than the lower threshold of the SOC balance control window, the vehicle is controlled to enter a hybrid power generation mode so as to improve the SOC value and avoid influencing the working modes such as pure electric starting and the like due to the fact that the SOC value is too low; when the SOC value is higher than the upper threshold of the SOC balance control window, the vehicle is controlled to enter a hybrid power assisting mode so as to reduce the SOC value, avoid the SOC value from being too high and accelerate the service life of the power battery to be attenuated.
The applicant research finds that in the prior art, the vehicle always adopts a constant SOC balance control window in the whole service period, namely, adopts a constant preset SOC lower limit threshold value and a preset SOC upper limit threshold value. However, with the use of the vehicle, the capacity of the power battery inevitably attenuates to different degrees, if a constant SOC balance control window is always used, the judgment of the vehicle for switching the working mode is not accurate, and meanwhile, the power battery is charged or discharged at an improper time, so that the aging of the power battery is further accelerated, and the service life is further prolonged.
Based on the above research, the present invention provides a method for controlling electric quantity balance, referring to fig. 1, and the method for controlling electric quantity balance provided by the embodiment of the present invention can be applied to hybrid electric vehicles, and other scenes with similar working conditions; referring to fig. 1, the method for controlling electric quantity balance according to the embodiment of the present invention may include:
step S100, obtaining a state of charge (SOC) value of the power battery and a battery core attenuation coefficient of the power battery.
With the extension of the service time of the power battery, the capacity of the power battery can be attenuated, and the attenuation phenomenon can be visually represented by the change of the resistance value of the battery core of the power battery. Therefore, to obtain the cell attenuation coefficient of the power battery, the current cell resistance value of the power battery is calculated first, and the cell attenuation coefficient of the power battery is further obtained according to the relation between the current cell resistance value of the power battery and the calibrated cell resistance value of the power battery. Of course, in the prior art, the method for determining the attenuation coefficient of the battery cell of the power battery is optional, and the method for determining the attenuation coefficient of the battery cell is not limited in the application of the invention.
Further, there are also various methods for obtaining the SOC value of the power battery. Alternatively, the open-circuit voltage of the power battery may be obtained, and the SOC value of the power battery may be estimated in combination with a first preset algorithm preset in the calculation program and in combination with the open-circuit voltage of the power battery. Alternatively, the output current value of the power battery can be obtained, and the SOC value of the power battery can be estimated by combining with a second preset algorithm. It should be noted that, the first preset algorithm and the second preset algorithm described in the present application may be any calculation method capable of estimating the SOC value of the power battery, which also falls within the scope of the present application.
It should be further noted that, the hybrid electric vehicle is provided with a battery management system, and the estimation of the SOC value of the power battery and the calculation of the attenuation coefficient of the battery core can be completed by the battery management system, and the parameters are obtained and then uploaded to the whole vehicle controller of the vehicle. Of course, the calculation function can be integrated into the whole vehicle controller, and the calculation of the relevant parameters can be directly completed by the whole vehicle controller.
And S110, reducing an SOC balance control window according to the battery core attenuation coefficient.
From the foregoing, it can be seen that the battery cell attenuation coefficient of the power battery can intuitively reflect the service life attenuation condition of the power battery, so that after the battery cell attenuation coefficient is obtained, the SOC balance control window needs to be reduced by combining with the battery cell attenuation coefficient, so that the SOC balance control window is more attached to the current capacity change of the power battery, that is, the current service life attenuation condition of the power battery.
Specifically, the SOC balance control window is characterized by a preset SOC lower limit threshold value and a preset SOC upper limit threshold value, so that the preset SOC lower limit threshold value is increased, and meanwhile, the preset SOC upper limit threshold value is reduced, so that the difference between the preset SOC lower limit threshold value and the preset SOC upper limit threshold value is reduced, and the SOC balance control window is reduced.
Optionally, dividing the preset SOC lower limit threshold by the obtained battery cell attenuation coefficient to obtain a first quotient. And replacing the preset SOC lower limit threshold value with the obtained first quotient value, namely updating the preset SOC lower limit threshold value into the obtained first quotient value. Since the cell attenuation coefficient is a value smaller than 1, the updated preset SOC lower limit threshold value is necessarily larger than the preset SOC lower limit threshold value before updating.
Optionally, multiplying the obtained battery cell attenuation coefficient by a preset SOC upper limit threshold to obtain a first product value. And updating the preset SOC upper limit threshold value to the obtained first product value. Similarly, since the cell attenuation coefficient is a value smaller than 1, the updated preset SOC upper limit threshold value will be smaller than the original preset SOC upper limit threshold value.
After the updating process, the SOC balance control window is reduced and is more close to the actual use condition of the power battery.
And step S120, comparing the relation between the SOC value of the power battery and the reduced SOC balance control window, and determining the vehicle working mode.
After the SOC balance control window is adjusted, the corresponding relation of the SOC of the power battery to the reduced SOC balance control window can be compared according to a comparison mode in the prior art, specifically, the SOC value of the current moment of the power battery is respectively compared with the adjusted preset SOC lower limit threshold value and the adjusted preset SOC upper limit threshold value, and the working mode of the vehicle is determined according to the size relation of the three. It should be noted that, in the prior art, any method for determining the vehicle operation mode according to the relationship between the SOC value and the SOC balance control window is optional, and the present application is not limited thereto.
In summary, according to the electric quantity balance control method provided by the invention, the SOC balance control window is reduced according to the attenuation condition of the power battery, and compared with the prior art that the working mode of the vehicle is determined by combining the SOC value of the power battery and the constant SOC balance control window, the SOC balance control window is dynamically adjusted, so that the determined working mode of the vehicle is more attached to the actual state of the power battery, the fuel economy of the vehicle can be effectively improved, meanwhile, the charging and discharging time of the power battery is more reasonable, and the attenuation of the service life of the power battery can be delayed.
It is conceivable that the decay of the service life of the power battery does not take place in a short time, but rather gradually with an increase in the service life or in the driving range of the vehicle. Therefore, the updating of the SOC balance control window may be performed in a plurality of times.
Alternatively, the usage time of the power battery or the vehicle may be examined, and the specific range of the SOC balance control window may be updated according to the usage time. After the vehicle is put into use, the first time length can be counted, and when the counted first time length reaches a preset time length threshold value, the steps are executed, and the SOC balance control window is updated. And after updating, starting timing again, counting the first time length again, and adjusting the SOC balance control window again when the first time length reaches the preset time length threshold again. And the power battery is reciprocated until the power battery cannot meet the normal use requirement.
Optionally, the driving mileage of the vehicle can be checked, and when the driving mileage of the vehicle reaches a preset mileage threshold, the steps are executed to update the SOC balance control window. And after updating, starting the statistics of the vehicle driving mileage again, and when the vehicle driving mileage reaches the mileage threshold again, adjusting the SOC balance control window again. And the power battery is reciprocated until the power battery cannot meet the normal use requirement.
The electric quantity balance control method provided by the invention can adjust the SOC balance control window in stages and for many times, so that the specific setting of the SOC balance window is continuously adjusted along with the actual use condition of the power battery, and the SOC balance control window has better fit with the power battery in the whole life cycle of the power battery, and can delay the service life attenuation of the power battery.
The following describes an electric quantity balance control device provided by the embodiment of the present invention, and the electric quantity balance control device described below can be regarded as a functional module architecture to be set in a central device for implementing the electric quantity balance control method provided by the embodiment of the present invention; the following description may be referred to with respect to the above.
Fig. 2 is a block diagram of a power balance control device according to an embodiment of the present invention, and referring to fig. 2, the device may include:
an obtaining unit 10, configured to obtain a state of charge SOC value of a power battery and a cell attenuation coefficient of the power battery;
an adjusting unit 20, configured to reduce an SOC balance control window according to the cell attenuation coefficient;
and the determining unit 30 is used for comparing the relation between the power battery SOC value and the reduced SOC balance control window to determine the vehicle working mode.
Optionally, the adjusting unit 20 is configured to reduce the SOC balance control window according to the cell attenuation coefficient, and specifically includes:
increasing a preset SOC lower limit threshold according to the battery cell attenuation coefficient;
and reducing a preset SOC upper limit threshold according to the battery cell attenuation coefficient.
Optionally, the adjusting unit 20 is configured to, when increasing the preset SOC lower limit threshold according to the battery cell attenuation coefficient, specifically include:
dividing a preset SOC lower limit threshold by the battery cell attenuation coefficient to obtain a first quotient;
and updating the preset SOC lower limit threshold value to the first quotient value.
Optionally, the adjusting unit 20 is configured to, when reducing the preset SOC upper limit threshold according to the battery cell attenuation coefficient, specifically include:
multiplying the preset SOC upper limit threshold value by the battery core attenuation coefficient to obtain a first product value;
and updating the preset SOC upper limit threshold value to the first product value.
Optionally, referring to fig. 3, another block diagram of an electric quantity balance control device according to an embodiment of the present invention further includes, on the basis of the device provided by the embodiment shown in fig. 2:
a time length counting unit 40 for counting a first time length;
the first returning unit 50 is configured to trigger the acquiring unit 10 and the adjusting unit 20 when the first time length reaches the preset time length threshold, and re-trigger the time length counting unit 40 after the adjusting unit 20 reduces the SOC balance control window.
Optionally, referring to fig. 4, a block diagram of still another power balance control apparatus according to an embodiment of the present invention further includes, on the basis of the apparatus provided by the embodiment shown in fig. 2:
a mileage statistics unit 60 for counting vehicle mileage;
the second returning unit 70 is configured to trigger the acquiring unit 10 and the adjusting unit 20 when the driving distance of the vehicle reaches the preset mileage threshold, and to re-trigger the mileage counting unit 60 after the adjusting unit 20 reduces the SOC balance control window.
Optionally, the acquiring unit 10 is configured to, when acquiring the SOC value, specifically include:
acquiring an open-circuit voltage of the power battery;
and combining a first preset algorithm, and estimating the SOC value of the power battery according to the open-circuit voltage.
Optionally, the acquiring unit 10 is configured to, when acquiring the SOC value, specifically include:
obtaining an output current value of the power battery;
and combining a second preset algorithm, and estimating the SOC value of the power battery according to the output current value.
Optionally, the acquiring unit 10 is configured to acquire the cell attenuation coefficient of the power battery, and specifically includes:
calculating the current cell resistance value of the power battery;
and determining the cell attenuation coefficient of the power battery according to the current cell resistance value and the calibrated cell resistance value of the power battery.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method of controlling power balance, comprising:
acquiring a state of charge (SOC) value of a power battery and a battery core attenuation coefficient of the power battery;
reducing an SOC balance control window according to the battery core attenuation coefficient; the SOC balance control window is characterized by a preset SOC lower limit threshold value and a preset SOC upper limit threshold value;
comparing the relation between the power battery SOC value and the reduced SOC balance control window, and determining a vehicle working mode; the power battery SOC value is respectively compared with an adjusted preset SOC lower limit threshold value and an adjusted preset SOC upper limit threshold value, and when the power battery SOC value is lower than the adjusted preset SOC lower limit threshold value, the vehicle is controlled to enter a hybrid power generation mode; when the SOC value of the power battery is higher than the adjusted preset SOC upper limit threshold value, controlling the vehicle to enter a hybrid power assisting mode;
wherein, according to the battery core attenuation coefficient, the reducing the SOC balance control window includes:
dividing a preset SOC lower limit threshold by the battery cell attenuation coefficient to obtain a first quotient;
updating the preset SOC lower limit threshold value to the first quotient value;
multiplying the preset SOC upper limit threshold value by the battery core attenuation coefficient to obtain a first product value;
and updating the preset SOC upper limit threshold value to the first product value.
2. The method of controlling power balance according to claim 1, characterized in that the method further comprises:
counting a first time length;
and when the first time length reaches a preset time length threshold value, executing the step of acquiring the SOC value of the power battery and the battery cell attenuation coefficient of the power battery, and reckoning the first time length after reducing the SOC balance control window.
3. The method of controlling power balance according to claim 1, characterized in that the method further comprises:
counting the driving mileage of the vehicle;
and when the vehicle driving mileage reaches a preset mileage threshold, executing the step of acquiring the state of charge (SOC) value of the power battery and the battery core attenuation coefficient of the power battery, and reckoning the vehicle driving mileage after reducing the SOC balance control window.
4. The method according to claim 1, wherein the obtaining the power battery state of charge SOC value includes:
acquiring an open-circuit voltage of the power battery;
and combining a first preset algorithm, and estimating the SOC value of the power battery according to the open-circuit voltage.
5. The method according to claim 1, wherein the obtaining the power battery state of charge SOC value includes:
obtaining an output current value of the power battery;
and combining a second preset algorithm, and estimating the SOC value of the power battery according to the output current value.
6. The method of claim 1, wherein the obtaining the cell attenuation coefficient of the power cell comprises:
calculating the current cell resistance value of the power battery;
and determining the cell attenuation coefficient of the power battery according to the current cell resistance value and the calibrated cell resistance value of the power battery.
7. An electric quantity balance control device, characterized by comprising:
the power battery comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a state of charge (SOC) value of a power battery and a cell attenuation coefficient of the power battery;
the adjusting unit is used for reducing the SOC balance control window according to the battery core attenuation coefficient; the SOC balance control window is characterized by a preset SOC lower limit threshold value and a preset SOC upper limit threshold value;
the determining unit is used for comparing the relation between the SOC value of the power battery and the reduced SOC balance control window and determining a vehicle working mode; the power battery SOC value is respectively compared with an adjusted preset SOC lower limit threshold value and an adjusted preset SOC upper limit threshold value, and when the power battery SOC value is lower than the adjusted preset SOC lower limit threshold value, the vehicle is controlled to enter a hybrid power generation mode; when the SOC value of the power battery is higher than the adjusted preset SOC upper limit threshold value, controlling the vehicle to enter a hybrid power assisting mode;
the adjusting unit is configured to reduce an SOC balance control window according to the cell attenuation coefficient, and specifically includes:
dividing a preset SOC lower limit threshold by the battery cell attenuation coefficient to obtain a first quotient;
updating the preset SOC lower limit threshold value to the first quotient value;
multiplying the preset SOC upper limit threshold value by the battery core attenuation coefficient to obtain a first product value;
and updating the preset SOC upper limit threshold value to the first product value.
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Citations (10)
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