CN114914960B - Battery charging control method for electric automobile, battery management system and automobile - Google Patents
Battery charging control method for electric automobile, battery management system and automobile Download PDFInfo
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- CN114914960B CN114914960B CN202110179635.2A CN202110179635A CN114914960B CN 114914960 B CN114914960 B CN 114914960B CN 202110179635 A CN202110179635 A CN 202110179635A CN 114914960 B CN114914960 B CN 114914960B
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- 238000012423 maintenance Methods 0.000 claims abstract description 281
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- 230000006855 networking Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
-
- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
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- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a battery charging control method of an electric automobile, which comprises the steps of determining an initial maintenance capacity target value of a battery through a calculated date interval of two times of charging, determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a prestored maintenance capacity residual value, charging the battery in a maintenance charging mode when the charging maintenance capacity target value meets maintenance conditions, and charging the battery in the maintenance charging mode through a small-rate charging current, thereby completing maintenance of a battery system and further effectively prolonging the service life of the battery. The embodiment of the invention also correspondingly provides a battery management system and an electric automobile.
Description
Technical Field
The present invention relates to the field of charging control technologies, and in particular, to a battery charging control method and a battery management system for an electric vehicle.
Background
With the popularization and application of electric vehicles, long life and high safety are problems that need to be focused and solved. In the use process of the electric automobile, the problem of long-time storage of the battery can be solved. After a general battery is stored for a long time, the problems of capacity decay, large capacity difference, increased internal resistance and the like exist. At this time, the battery is charged at a normal charging rate, and there is a risk of life deterioration and lithium precipitation from the battery. Therefore, how to maintain the battery of an electric vehicle is a subject of research significance.
Disclosure of Invention
The embodiment of the invention provides a battery charging control method of an electric automobile, a battery management system and the electric automobile, which can solve the problem that the service life and the safety risk of the battery are possibly damaged when the electric automobile is used again after being parked for a long time.
An embodiment of the present invention provides a battery charging control method for an electric vehicle, where the control method is executed by a battery management system, and includes the following steps:
Calculating a date interval between a current date and a date at which a last charge is ended in response to a start of battery charge;
setting an initial maintenance capacity target value of the battery according to the date interval;
determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a maintenance capacity remaining value stored in advance;
And when the charging maintenance capacity target value meets maintenance conditions, charging the battery in a maintenance charging mode.
Preferably, the setting the initial maintenance capacity target value of the battery according to the date interval specifically includes:
setting the initial maintenance capacity target value to 0 when the date interval is smaller than a first preset date interval;
Setting the initial maintenance capacity target value as a first maintenance capacity target value when the date interval is equal to a first preset date interval;
When the date interval is greater than a first preset date interval and the date interval is less than a second preset date interval, setting the initial curing capacity target value as a third curing capacity target value, and the third curing capacity target value satisfies: c3 = (C2-C1) (Δd-N)/(M-N) +c1, where C1 is a first curing capacity target value, C2 is a second curing capacity target value, C3 is a third curing capacity target value, Δd is a date interval, N is a first preset date interval, and M is a second preset date interval;
and setting the initial maintenance capacity target value as a second maintenance capacity target value when the date interval is greater than or equal to a second preset date interval.
Preferably, the determining the charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a prestored maintenance capacity remaining value specifically includes:
And comparing the initial maintenance capacity target value with the maintenance capacity remaining value, and selecting the larger value of the initial maintenance capacity target value and the maintenance capacity remaining value as the charging maintenance capacity target value of the battery.
Preferably, after the determination of the battery charging maintenance capacity target value according to the initial maintenance capacity target value and the maintenance capacity remaining value stored in advance, the method further comprises:
And when the charging maintenance capacity target value does not meet maintenance conditions, charging the battery in a normal charging mode.
Preferably, when the charging maintenance capacity target value meets a maintenance condition, charging the battery in a maintenance charging mode, specifically including:
And when the charging maintenance capacity target value is larger than 0, charging the battery with a small-rate charging current in the maintenance charging mode, updating the charging maintenance capacity target value at the current moment in real time, and charging the battery in a normal charging mode when the charging maintenance capacity target value does not meet maintenance conditions.
Preferably, the updating the charging maintenance capacity target value at the current moment in real time specifically includes:
acquiring charging current, charging time and a charging maintenance target value at the previous moment in real time;
updating the charging maintenance capacity target value at the current moment in real time through the following formula:
Cmaintain_act(t)＝Cmaintain_act(t-1)-I*Δt
wherein CMAINTAIN _act (t) is the charging maintenance capacity target value at the current time, CMAINTAIN _act (t-1) is the charging maintenance capacity target value at the previous time, I is the charging current, and Δt is the charging time.
Preferably, the battery charging control method of the electric automobile further comprises:
and in response to the end of battery charging, updating the date of the end of charging and updating the maintenance capacity remaining value to the current charging maintenance capacity target value.
A second aspect of an embodiment of the present invention provides a battery management system, including:
A date interval calculating module for calculating a date interval between a current date and a date at which the last charging is ended in response to the start of the charging of the battery;
The initial maintenance capacity target value determining module is used for setting an initial maintenance capacity target value of the battery according to the date interval;
the charging maintenance capacity target value determining module is used for determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a maintenance capacity remaining value stored in advance;
and the maintenance charging control module is used for charging the battery in a maintenance charging mode when the charging maintenance capacity target value meets maintenance conditions.
A third aspect of the embodiment of the present invention provides an electric vehicle, which includes the battery management system according to the foregoing embodiment.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the embodiment of the invention provides a battery charging control method of an electric automobile, which comprises the steps of determining an initial maintenance capacity target value of a battery through a calculated date interval of two times of charging, determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a prestored maintenance capacity residual value, charging the battery in a maintenance charging mode when the charging maintenance capacity target value meets maintenance conditions, and charging the battery in the maintenance charging mode by charging with a small-rate charging current, thereby completing maintenance of a battery system and further effectively prolonging the service life of the battery. The embodiment of the invention also correspondingly provides a battery management system and an electric automobile.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a battery charging control method of an electric vehicle according to the present invention;
Fig. 2 is a schematic flow chart of another embodiment of a battery charging control method of an electric vehicle according to the present invention;
fig. 3 is a block diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Referring to fig. 1, a schematic flow chart of an embodiment of a battery charging control method of an electric vehicle according to the present invention is shown.
The battery charging control method of the electric automobile provided by the embodiment of the invention is executed by a battery management system and comprises the following steps:
Step S10, in response to the start of battery charging, calculating a date interval between a current date and a date when the last charging is finished;
step S20, setting an initial maintenance capacity target value of the battery according to the date interval;
Step S30, determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a maintenance capacity remaining value stored in advance;
And step S40, when the charging maintenance capacity target value meets maintenance conditions, charging the battery in a maintenance charging mode.
In the embodiment of the invention, the initial maintenance capacity target value of the battery is determined through the date interval of the two charges obtained through calculation, the charging maintenance capacity target value of the battery is determined according to the initial maintenance capacity target value and the maintenance capacity remaining value stored in advance, when the charging maintenance capacity target value meets the maintenance condition, the battery is charged in a maintenance charging mode, and the battery system is maintained through charging with a small-rate charging current in the maintenance charging mode, so that the service life of the battery can be effectively prolonged.
It is worth to describe that, in the method for performing maintenance charging control on the battery by using the external control system of the charging pile in the prior art, the maintenance mode can only be realized on the charging pile with a special function, however, most of charging piles in the market at present do not have the maintenance function yet, in actual application, the maintenance function is required to be actively started by a vehicle owner, and the application is limited and difficult to popularize. The control method of the embodiment of the invention is executed by the controller of the vehicle end, intelligently judges whether the battery needs maintenance from the vehicle end, can be realized according to the interactive flow and the control time sequence specified by national standards, and can be widely popularized and applied.
In an alternative embodiment, the step S10 "calculating the date interval between the current date and the date when the last charging is completed in response to the start of the battery charging" specifically includes:
Acquiring a date stored by a battery management system when the last charging is finished in response to the start of the battery charging;
Receiving the current date of the current charging uploaded by the vehicle-mounted T-BOX;
and calculating the difference between the date of the last charge and the current date to obtain a date interval.
The vehicle-mounted T-BOX (Telematics BOX) is a part of a vehicle networking system (the vehicle networking system comprises a host, a vehicle-mounted T-BOX, a mobile phone APP and a background system) and is mainly used for interconnecting and communicating with the background system/the mobile phone APP to realize vehicle information display and control of the background system/the mobile phone APP. The vehicle-mounted T-Box is used as a wireless gateway to provide a remote communication interface for the whole vehicle, and can provide services such as vehicle condition report, driving report, oil consumption statistics, fault reminding, violation inquiry, position track, driving behavior, safety theft prevention, reservation service, remote vehicle finding, vehicle door control by using a mobile phone, window control, lamp control, lock control, loudspeaker control, double flashing control, reflector folding control, skylight control, monitoring central control warning, safety airbag state and the like. The battery management system in the embodiment of the invention acquires the current date by receiving the information uploaded by the vehicle-mounted T-BOX, and of course, in the embodiment of the invention, the current date can also be acquired by other prior art, and no more description is given here.
In an alternative embodiment, the step S20 "setting the initial maintenance capacity target value of the battery according to the date interval" specifically includes:
setting the initial maintenance capacity target value to 0 when the date interval is smaller than a first preset date interval;
Setting the initial maintenance capacity target value as a first maintenance capacity target value when the date interval is equal to a first preset date interval;
When the date interval is greater than a first preset date interval and the date interval is less than a second preset date interval, setting the initial curing capacity target value as a third curing capacity target value, and the third curing capacity target value satisfies: c3 = (C2-C1) (Δd-N)/(M-N) +c1, where C1 is a first curing capacity target value, C2 is a second curing capacity target value, C3 is a third curing capacity target value, Δd is a date interval, N is a first preset date interval, and M is a second preset date interval;
and setting the initial maintenance capacity target value as a second maintenance capacity target value when the date interval is greater than or equal to a second preset date interval.
Specifically, in the embodiment of the present invention, the first curing capacity target value, the second curing capacity target value, the first preset date interval, and the second preset date interval are related to the battery type, the system material, and the characteristics, and specific values of the first curing capacity target value, the second curing capacity target value, the first preset date interval, and the second preset date interval may be set according to actual use requirements.
In an alternative embodiment, the step S30 "determining the charge maintenance capacity target value of the battery according to the initial maintenance capacity target value and a pre-stored maintenance capacity remaining value" specifically includes:
And comparing the initial maintenance capacity target value with the maintenance capacity remaining value, and selecting the larger value of the initial maintenance capacity target value and the maintenance capacity remaining value as the charging maintenance capacity target value of the battery.
In a specific application, the initial maintenance capacity target value CMAINTAIN obtained in the above step S20 and the maintenance capacity remaining value CMAINTAIN _left stored inside the battery management system are obtained and compared, and then the charging maintenance capacity target value CMAINTAIN _act is determined by the formula CMAINTAIN _act=max (CMAINTAIN, CMAINTAIN _left), which aims to: on the one hand, according to the date interval of the two times of charging, the target value of the battery itself needing maintenance is primarily determined, on the other hand, the situation that the time interval of the two times of charging is short, but the target value of the maintenance capacity needed by the battery is not complete is considered, the maintenance of the battery management system is ensured, and then the battery enters a normal charging mode.
Illustratively, in the case where the charging is ended when the last charging is not completed with the maintenance capacity target value, the current maintenance capacity remaining value CMAINTAIN _left of the battery is made larger than 0, and the date interval between the current date and the date when the last charging is ended is smaller than the first preset date interval, the initial maintenance capacity target value CMAINTAIN is set to 0 according to the above step S20, and the charge maintenance capacity target value CMAINTAIN _act of the battery is obtained according to the formula CMAINTAIN _act=max (CMAINTAIN, CMAINTAIN _left), and at this time, the charge maintenance capacity target value CMAINTAIN _act of the battery is equal to the maintenance capacity remaining value CMAINTAIN _left, whereby even if the primarily determined maintenance target value of the battery is made 0 due to the shorter date interval of the two charges, however, since the maintenance capacity target value required for the last charging of the battery is not completed, the maintenance capacity target value CMAINTAIN _act is determined as the maintenance capacity remaining value CMAINTAIN _left by determining the charge maintenance capacity target value of the battery more comprehensively, thereby ensuring that the battery effectively needs to complete charge maintenance capacity target value CMAINTAIN _act of the battery, and thus the battery is effectively prolonged to the normal life of the battery under the condition that the maintenance is completed.
In an alternative embodiment, after the step S30 "the step of determining the charge maintenance capacity target value of the battery according to the initial maintenance capacity target value and the maintenance capacity remaining value stored in advance", further includes:
and when the charging maintenance capacity target value does not meet maintenance conditions, charging the battery at a normal charging rate.
In the embodiment of the present invention, when the charging maintenance capacity target value is equal to 0, it is indicated that the initial maintenance capacity target value CMAINTAIN and the maintenance capacity remaining value CMAINTAIN _left are both 0, which means that the battery does not need maintenance, and can directly enter a normal charging mode to charge the battery at a normal charging rate. In addition, in the embodiment of the present invention, the charging of the battery at the normal charging rate refers to charging the battery at the current charging capability value of the battery.
In an alternative embodiment, the step S40 "when the charging maintenance capacity target value meets a maintenance condition, the charging the battery in the maintenance charging mode" specifically includes:
And when the charging maintenance capacity target value is larger than 0, charging the battery with a small-rate charging current in the maintenance charging mode, updating the charging maintenance capacity target value at the current moment in real time, and charging the battery in a normal charging mode when the charging maintenance capacity target value does not meet maintenance conditions.
The method for updating the charging maintenance capacity target value at the current moment in real time specifically comprises the following steps:
acquiring charging current, charging time and a charging maintenance target value at the previous moment in real time;
updating the charging maintenance capacity target value at the current moment in real time through the following formula:
Cmaintain_act(t)＝Cmaintain_act(t-1)-I*Δt
wherein CMAINTAIN _act (t) is the charging maintenance capacity target value at the current time, CMAINTAIN _act (t-1) is the charging maintenance capacity target value at the previous time, I is the charging current, and Δt is the charging time.
In the embodiment of the invention, when the charging maintenance capacity target value is greater than 0, the battery system is maintained by charging with a small-rate charging current in the maintenance charging mode, so that the service life of the battery can be effectively prolonged. In addition, in the embodiment of the present invention, the charge maintenance capacity target value decreases with the increase of the battery charge amount, and when the charge maintenance capacity target value decreases to 0, it is indicated that the battery does not need to continue maintenance, and at this time, the battery may be charged in the normal charge mode.
In an alternative embodiment, the battery charging control method of the electric vehicle further includes:
and in response to the end of battery charging, updating the date of the end of charging and updating the maintenance capacity remaining value to the current charging maintenance capacity target value.
In practical applications, it is possible to end charging when the battery has completed or has not completed the charge maintenance capacity target value. In the embodiment of the invention, when each charging is finished, the maintenance capacity remaining value is updated to the current charging maintenance capacity target value, so that the maintenance capacity target value required by the battery after the battery is finished to be charged is recorded, and the stored maintenance capacity remaining value is directly used for comparing with the initial maintenance capacity target value in the step S30 when the next charging is convenient.
Referring to fig. 2, a flow chart of another embodiment of a battery charging control method of an electric vehicle according to the present invention is shown. In this embodiment, the charge control method execution includes steps S1 to S6:
Step S1, in response to the start of battery charging, calculating a date interval of two charges, including obtaining a date D1 of the last charge end and a date D2 of the current date, and obtaining a date interval Δd by Δd=d2-D1;
Step S2, determining an initial maintenance capacity target value CMAINTAIN of the battery according to the date interval Δd, including:
when Δd < N, initial maintenance capacity target value CMAINTAIN =0;
when Δd=n, the initial maintenance capacity target value CMAINTAIN =c1;
when N < Δd < M, initial maintenance capacity target value CMAINTAIN = (C2-C1) (Δd-N)/(M-N) +c1;
when Δd is greater than or equal to M, the initial maintenance capacity target value CMAINTAIN =c2;
step S3, determining a battery charging maintenance capacity target value CMAINTAIN _act=max (CMAINTAIN, CMAINTAIN _left) according to the initial maintenance capacity target value CMAINTAIN and a pre-stored maintenance capacity remaining value CMAINTAIN _left;
Step S4, judging whether the charging maintenance capacity target value CMAINTAIN _act is larger than 0;
Step S5, if the charging maintenance capacity target value CMAINTAIN _act is greater than 0, entering a maintenance charging mode, charging the battery with a small-rate charging current in the maintenance charging mode, updating the charging maintenance capacity target value CMAINTAIN _act (t) at the current moment in real time through a formula CMAINTAIN _act (t) = CMAINTAIN _act (t-1) -i×Δt, returning to step S4, and entering a normal charging mode when the charging maintenance capacity target value CMAINTAIN _act=0; otherwise, entering a normal charging mode, and charging the battery according to the current charging capacity value of the battery;
Step S6, in response to the end of the battery charging, updating the date D1 of the end of the charging, and setting CMAINTAIN _left= CMAINTAIN _act, and updating the maintenance capacity remaining value to the current charging maintenance capacity target value.
Referring to fig. 3, a block diagram of a battery management system according to another embodiment of the present invention is shown.
The battery management system 100 provided in the embodiment of the invention includes:
a date interval calculating module 10 for calculating a date interval between a current date and a date at which the last charging is ended in response to the start of the battery charging;
an initial maintenance capacity target value determining module 20, configured to set an initial maintenance capacity target value of the battery according to the date interval;
A charging maintenance capacity target value determining module 30, configured to determine a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a maintenance capacity remaining value stored in advance;
And a maintenance charge control module 40 for charging the battery in a maintenance charge mode when the charge maintenance capacity target value satisfies a maintenance condition.
In an alternative embodiment, the initial maintenance capacity target value determining module 20 is specifically configured to:
setting the initial maintenance capacity target value to 0 when the date interval is smaller than a first preset date interval;
Setting the initial maintenance capacity target value as a first maintenance capacity target value when the date interval is equal to a first preset date interval;
When the date interval is greater than a first preset date interval and the date interval is less than a second preset date interval, setting the initial curing capacity target value as a third curing capacity target value, and the third curing capacity target value satisfies: c3 = (C2-C1) (Δd-N)/(M-N) +c1, where C1 is a first curing capacity target value, C2 is a second curing capacity target value, C3 is a third curing capacity target value, Δd is a date interval, N is a first preset date interval, and M is a second preset date interval;
and setting the initial maintenance capacity target value as a second maintenance capacity target value when the date interval is greater than or equal to a second preset date interval.
In an alternative embodiment, the charging maintenance capacity target value determining module 30 is specifically configured to compare the initial maintenance capacity target value and the maintenance capacity remaining value, and select a larger value of the two as the charging maintenance capacity target value of the battery.
In an alternative embodiment, the maintenance charging control module 40 is specifically configured to: and when the charging maintenance capacity target value is larger than 0, charging the battery with a small-rate charging current in the maintenance charging mode, updating the charging maintenance capacity target value at the current moment in real time, and charging the battery in a normal charging mode when the charging maintenance capacity target value does not meet maintenance conditions.
Specifically, the updating the charging maintenance capacity target value at the current moment in real time includes:
acquiring charging current, charging time and a charging maintenance target value at the previous moment in real time;
updating the charging maintenance capacity target value at the current moment in real time through the following formula:
Cmaintain_act(t)＝Cmaintain_act(t-1)-I*Δt
wherein CMAINTAIN _act (t) is the charging maintenance capacity target value at the current time, CMAINTAIN _act (t-1) is the charging maintenance capacity target value at the previous time, I is the charging current, and Δt is the charging time.
In an alternative embodiment, the battery management system 100 further includes a normal charging control module for charging the battery in a normal charging mode when the charging maintenance capacity target value does not satisfy a maintenance condition.
In an alternative embodiment, the battery management system 100 further includes:
And the charging end control module is used for updating the date of the charging end in response to the charging end of the battery and updating the maintenance capacity remaining value to be the current charging maintenance capacity target value.
It should be noted that, the battery management system provided by the embodiment of the present invention is used for executing all the flow steps of the battery charging control method of the electric vehicle in the foregoing embodiment, and the working principles and beneficial effects of the two correspond to each other one by one, so that the description is omitted.
It should be noted that the above-described embodiments of the battery management system are merely illustrative, and the units described as separate units may or may not be physically separate, and the units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the battery management system provided by the invention, the connection relation between the modules represents that the modules are in communication connection, and the connection relation can be specifically realized as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Another embodiment of the present invention correspondingly provides an electric vehicle, which includes the battery management system provided in the foregoing embodiment.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the embodiment of the invention provides a battery charging control method of an electric automobile, which comprises the steps of determining an initial maintenance capacity target value of the battery through a calculated date interval of two times of charging, determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a prestored maintenance capacity residual value, charging the battery in a maintenance charging mode when the charging maintenance capacity target value meets maintenance conditions, and charging the battery in the maintenance charging mode by charging with a small-rate charging current so as to solve the problem that the service life and the safety risk of the battery are possibly damaged when the electric automobile is used again after being parked for a long time, thereby completing maintenance of a battery system and further effectively prolonging the service life of the battery. The embodiment of the invention also correspondingly provides a battery management system and an electric automobile.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (7)
1. A battery charge control method of an electric vehicle, wherein the control method is performed by a battery management system, comprising the steps of:
Calculating a date interval between a current date and a date at which a last charge is ended in response to a start of battery charge;
setting an initial maintenance capacity target value of the battery according to the date interval;
determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a maintenance capacity remaining value stored in advance;
when the charging maintenance capacity target value meets maintenance conditions, charging the battery in a maintenance charging mode;
The setting of the initial maintenance capacity target value of the battery according to the date interval specifically comprises the following steps:
setting the initial maintenance capacity target value to 0 when the date interval is smaller than a first preset date interval;
Setting the initial maintenance capacity target value as a first maintenance capacity target value when the date interval is equal to a first preset date interval;
When the date interval is greater than a first preset date interval and the date interval is less than a second preset date interval, setting the initial curing capacity target value as a third curing capacity target value, and the third curing capacity target value satisfies: c3 = (C2-C1) (Δd-N)/(M-N) +c1, where C1 is a first curing capacity target value, C2 is a second curing capacity target value, C3 is a third curing capacity target value, Δd is a date interval, N is a first preset date interval, and M is a second preset date interval;
Setting the initial maintenance capacity target value as a second maintenance capacity target value when the date interval is greater than or equal to a second preset date interval;
The method comprises the steps of determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a prestored maintenance capacity remaining value, wherein the charging maintenance capacity target value of the battery is specifically:
And comparing the initial maintenance capacity target value with the maintenance capacity remaining value, and selecting the larger value of the initial maintenance capacity target value and the maintenance capacity remaining value as the charging maintenance capacity target value of the battery.
2. The battery charge control method of an electric vehicle according to claim 1, characterized by further comprising, after said determining a charge maintenance capacity target value of a battery based on said initial maintenance capacity target value and a maintenance capacity remaining value stored in advance:
And when the charging maintenance capacity target value does not meet maintenance conditions, charging the battery in a normal charging mode.
3. The battery charge control method of an electric vehicle according to claim 1, wherein when the charge maintenance capacity target value satisfies a maintenance condition, charging the battery in a maintenance charge mode, specifically comprising:
And when the charging maintenance capacity target value is larger than 0, charging the battery with a small-rate charging current in the maintenance charging mode, updating the charging maintenance capacity target value at the current moment in real time, and charging the battery in a normal charging mode when the charging maintenance capacity target value does not meet maintenance conditions.
4. The battery charge control method of an electric vehicle according to claim 3, wherein the updating the charge maintenance capacity target value at the present time in real time specifically includes:
acquiring charging current, charging time and a charging maintenance target value at the previous moment in real time;
updating the charging maintenance capacity target value at the current moment in real time through the following formula:
Cmaintain_act(t)＝Cmaintain_act(t-1)-I*Δt
wherein CMAINTAIN _act (t) is the charging maintenance capacity target value at the current time, CMAINTAIN _act (t-1) is the charging maintenance capacity target value at the previous time, I is the charging current, and Δt is the charging time.
5. The battery charge control method of an electric vehicle according to claim 4, further comprising:
and in response to the end of battery charging, updating the date of the end of charging and updating the maintenance capacity remaining value to the current charging maintenance capacity target value.
6. A battery management system, comprising:
A date interval calculating module for calculating a date interval between a current date and a date at which the last charging is ended in response to the start of the charging of the battery;
an initial maintenance capacity target value setting module, configured to set an initial maintenance capacity target value of the battery according to the date interval;
the charging maintenance capacity target value determining module is used for determining a charging maintenance capacity target value of the battery according to the initial maintenance capacity target value and a maintenance capacity remaining value stored in advance;
The maintenance charging control module is used for charging the battery in a maintenance charging mode when the charging maintenance capacity target value meets maintenance conditions;
The initial maintenance capacity target value determining module is specifically configured to:
Setting the initial maintenance capacity target value to 0 when the date interval is smaller than a first preset date interval; setting the initial maintenance capacity target value as a first maintenance capacity target value when the date interval is equal to a first preset date interval; when the date interval is greater than a first preset date interval and the date interval is less than a second preset date interval, setting the initial curing capacity target value as a third curing capacity target value, and the third curing capacity target value satisfies: c3 = (C2-C1) (Δd-N)/(M-N) +c1, where C1 is a first curing capacity target value, C2 is a second curing capacity target value, C3 is a third curing capacity target value, Δd is a date interval, N is a first preset date interval, and M is a second preset date interval; setting the initial maintenance capacity target value as a second maintenance capacity target value when the date interval is greater than or equal to a second preset date interval;
the charging maintenance capacity target value determining module is specifically configured to:
And comparing the initial maintenance capacity target value with the maintenance capacity remaining value, and selecting the larger value of the initial maintenance capacity target value and the maintenance capacity remaining value as the charging maintenance capacity target value of the battery.
7. An electric vehicle comprising the battery management system of claim 6.
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Address after: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: GAC AION NEW ENERGY AUTOMOBILE Co.,Ltd. Country or region after: China Address before: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: GAC AION New Energy Vehicle Co.,Ltd. Country or region before: China |