CN112018847A - Charging processing method and device for rechargeable battery and electric vehicle - Google Patents
Charging processing method and device for rechargeable battery and electric vehicle Download PDFInfo
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- CN112018847A CN112018847A CN202010880007.2A CN202010880007A CN112018847A CN 112018847 A CN112018847 A CN 112018847A CN 202010880007 A CN202010880007 A CN 202010880007A CN 112018847 A CN112018847 A CN 112018847A
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a charging processing method and device for a rechargeable battery and an electric vehicle. Wherein, the method comprises the following steps: determining that the voltage at two ends of at least one single battery in the rechargeable battery in the current charging stage reaches a preset cut-off voltage value; controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches a preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between a first charging stage and a last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage; and determining the adjusted current value as a preset current value, and controlling the rechargeable battery to enter the last charging stage. The invention solves the technical problem that the charging time is longer due to the adoption of a battery charging mode in the related technology.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a charging processing method and device of a rechargeable battery and an electric vehicle.
Background
At present, electric vehicles are widely used, and more people tend to buy the electric vehicles because the electric vehicles are more convenient. For the whole car factory or the battery supplier, the charging time of the electric car is undoubtedly one of the important points of concern; however, based on the characteristics Of electrochemical products, the forward and reverse movement Of ions always has a certain time, and the larger the current at the charging end, the larger the influence on the charging capacity Of the battery product, so that the entire car factory or the battery supplier can limit the actual charging capacity Of the battery when charging to a State Of Charge (SOC), such as 80% SOC, to gradually reduce the charging current, and finally fully Charge the battery with a small current. However, although the charging amount of the battery is ensured by the method, the average charging current of the battery is greatly reduced, the full charging time of the battery is prolonged, and the bad influence is caused to the customer experience.
As can be seen from the above, the charging method in the prior art greatly limits the charging capability of the battery, and the charging capability of the battery in the high SOC stage cannot be released from the charging strategy, so that the charging time in the high SOC stage is prolonged, and the charging time of the remaining 20% SOC is not shorter than the charging time of the 80% SOC, which causes complaints.
In view of the above-mentioned problem that the battery charging method adopted in the related art will result in a long charging time, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a charging processing method and device for a rechargeable battery and an electric vehicle, which at least solve the technical problem that a charging time is long due to a battery charging mode adopted in the related technology.
According to an aspect of the embodiments of the present invention, there is provided a charging processing method of a rechargeable battery, including: determining that the voltage across at least one single battery in a rechargeable battery in a current charging stage reaches a preset cut-off voltage value, wherein the current charging stage is the first charging stage of the rechargeable battery, and the preset cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameters of the rechargeable battery; controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches the preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between the first charging stage and the last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage; and determining the adjusted current value as a preset current value, and controlling the rechargeable battery to enter the last charging stage.
Optionally, before determining that the voltage across at least one single battery in the rechargeable battery in the current charging stage reaches the predetermined cutoff voltage value, the charging processing method of the rechargeable battery further includes: acquiring the electrical parameters of each single battery in the rechargeable battery; determining a highest cut-off voltage value of the rechargeable battery and an initial current value of the rechargeable battery based on the electrical parameter, wherein the initial current value is a current value when the rechargeable battery is charged in the first charging stage; and controlling the rechargeable battery to enter the first charging stage.
Optionally, adjusting the charging current value of the rechargeable battery includes: determining a current adjustment mode corresponding to the initial current value based on a predetermined current value adjustment strategy, wherein the predetermined current value adjustment strategy is obtained by machine learning training using a plurality of sets of training data, and each set of training data in the plurality of sets of training data comprises: an initial current value and a current adjustment mode corresponding to the initial current value; adjusting a charging current value of the rechargeable battery in the intermediate charging phase based on the current adjustment mode.
Optionally, before determining the current adjustment mode corresponding to the initial current value based on a predetermined current value adjustment strategy, the charging processing method of the rechargeable battery further includes: acquiring a plurality of historical initial current values in a historical time period and a plurality of historical current adjustment modes corresponding to the plurality of historical initial current values; and training a plurality of groups of training data comprising the current regulation mode and the plurality of historical current regulation modes to obtain the current regulation mode.
Optionally, adjusting the charging current value of the rechargeable battery includes: acquiring voltage drop data of the rechargeable battery, wherein the voltage drop data is a voltage drop value of the rechargeable battery after the rechargeable battery is charged to the preset cut-off voltage value by different current values; determining a current adjustment mode for adjusting a charging current value of the rechargeable battery based on the initial current value and the voltage drop-back data; adjusting a charging current value of the rechargeable battery based on the current adjustment mode.
Optionally, the initial current value is greater than the current value adjusted based on the current adjustment mode, and the current value adjusted each time based on the current adjustment mode gradually decreases until the preset current value is reached.
Optionally, controlling the rechargeable battery to enter the last charging phase includes: and controlling the rechargeable battery to be charged at the preset current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches the preset cut-off voltage value, and finishing charging.
According to another aspect of the embodiments of the present invention, there is also provided a charging processing apparatus for a rechargeable battery, including: the device comprises a first determining unit, a second determining unit and a control unit, wherein the first determining unit is used for determining that the voltage across at least one single battery in a rechargeable battery reaches a preset cut-off voltage value in a current charging stage, the current charging stage is the first charging stage of the rechargeable battery, and the preset cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameters of the rechargeable battery; the first control unit is used for controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches the preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between the first charging stage and the last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage; and the second control unit is used for determining the adjusted current value as a preset current value and controlling the rechargeable battery to enter the last charging stage.
Optionally, the charging processing apparatus for a rechargeable battery further includes: the device comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring the electric parameters of each single battery in the rechargeable battery before the voltage of two ends of at least one single battery in the rechargeable battery in the current charging stage is determined to reach a preset cut-off voltage value; a third determining unit, configured to determine, based on the electrical parameter, a highest cut-off voltage value of the rechargeable battery and an initial current value of the rechargeable battery, where the initial current value is a current value when the rechargeable battery is charged in the first charging phase; and the third control unit is used for controlling the rechargeable battery to enter the first charging stage.
Optionally, the first control unit includes: a first determining module, configured to determine a current adjustment mode corresponding to the initial current value based on a predetermined current value adjustment strategy, where the predetermined current value adjustment strategy is obtained through machine learning training using multiple sets of training data, and each set of training data in the multiple sets of training data includes: an initial current value and a current adjustment mode corresponding to the initial current value; a first adjusting module, configured to adjust a charging current value of the rechargeable battery in the intermediate charging phase based on the current adjusting mode.
Optionally, the charging processing apparatus for a rechargeable battery further includes: the current adjustment module is used for determining a current adjustment mode corresponding to the initial current value according to a preset current value adjustment strategy, and acquiring a plurality of historical initial current values in a historical time period and a plurality of historical current adjustment modes corresponding to the plurality of historical initial current values; and the training module is used for training a plurality of groups of training data comprising the current regulation mode and the plurality of historical current regulation modes to obtain the current regulation mode.
Optionally, the first control unit includes: the acquisition module is used for acquiring voltage drop data of the rechargeable battery, wherein the voltage drop data is a voltage drop value of the rechargeable battery after the rechargeable battery is charged to the preset cut-off voltage value by different current values; a second determination module configured to determine a current adjustment mode for adjusting a charging current value of the rechargeable battery based on the initial current value and the voltage drop-back data; and the second adjusting module is used for adjusting the charging current value of the rechargeable battery based on the current adjusting mode.
Optionally, the initial current value is greater than the current value adjusted based on the current adjustment mode, and the current value adjusted each time based on the current adjustment mode gradually decreases until the preset current value is reached.
Optionally, the second control unit includes: and the control module is used for controlling the rechargeable battery to be charged at the preset current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches the preset cut-off voltage value, and the charging is finished.
According to another aspect of the embodiment of the present invention, there is also provided an electric vehicle using the charging processing method of the rechargeable battery described in any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is executed by a processor, the computer program controls an apparatus where the computer storage medium is located to execute the method for charging a rechargeable battery according to any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to execute a computer program, where the computer program executes to execute the charging processing method for a rechargeable battery according to any one of the above.
In the embodiment of the invention, the method comprises the steps of determining that the voltage at two ends of at least one single battery in a rechargeable battery in a current charging stage reaches a preset cut-off voltage value, wherein the current charging stage is the first charging stage of the rechargeable battery, and the preset cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameters of the rechargeable battery; controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches a preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between a first charging stage and a last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage; the purpose of reasonably charging the rechargeable battery is achieved through the charging processing method of the rechargeable battery provided by the embodiment of the invention, the technical effect of improving the charging efficiency is achieved, and the technical problem that the charging time is long due to the adoption of a battery charging mode in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a charging processing method of a rechargeable battery according to the prior art;
fig. 2 is a flowchart of a charging processing method of a rechargeable battery according to an embodiment of the present invention;
FIG. 3 is a schematic current-voltage diagram for charging a rechargeable battery according to an embodiment of the present invention;
FIG. 4 is a flow chart of an alternative method of charging a rechargeable battery according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a charge processing device for charging a battery according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For convenience of understanding, some terms or expressions appearing in the embodiments of the present invention will be described below.
State Of Charge (SOC): i.e., state of charge, is used to reflect the remaining capacity of the battery, which is numerically defined as the ratio of remaining capacity to battery capacity, expressed as a percentage. The value range is 0-1, which indicates that the battery is completely discharged when the SOC is 0 and indicates that the battery is completely charged when the SOC is 1.
Battery Management System (BMS): the control system is used for protecting the use safety of the power battery.
Fig. 1 is a flowchart of a charging processing method of a rechargeable battery according to the prior art, as shown in fig. 1, determining that the rechargeable battery starts to be charged, recognizing a current charging voltage V using a battery management system BMS, obtaining a corresponding current I1 when V reaches a certain cell maximum voltage V1, and charging with I1; and then judging whether the current charging voltage V reaches the highest voltage V2 of the single battery cell (V2> V1), if so, continuing to request to reduce the current value to I3, charging the rechargeable battery by I3 until the highest voltage V3 of the single battery cell, repeating the steps until the current value is reduced to Ix, stopping after the current value is firstly charged to the Vmax by Ix, and finishing the charging.
As can be seen from the above, in the above manner, during the charging of the rechargeable battery, the charging current value is sequentially reduced at each charging stage, and the voltage at the time of adjusting the current value is also adjusted, so that the charging capability of the rechargeable battery is limited.
The charging capacity of the battery is greatly limited in the above mode, the charging capacity of the battery in the high SOC stage cannot be released in a strategy, the charging time in the high SOC stage is prolonged, the charging time of the remaining 20% of SOC is not shorter than that of the front 80% of SOC, and complaints of many vehicle owners in the market are caused.
In view of the above problems, embodiments of the present invention provide a method and an apparatus for charging a rechargeable battery, which will be described in detail below.
Example 1
In accordance with an embodiment of the present invention, there is provided a method embodiment of a method of charging a rechargeable battery, where the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions, and where a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 2 is a flowchart of a charging processing method of a rechargeable battery according to an embodiment of the present invention, as shown in fig. 2, the charging processing method of the rechargeable battery includes the steps of:
step S202, determining that the voltage across at least one single battery in the rechargeable battery in the current charging stage reaches a preset cut-off voltage value, wherein the current charging stage is the first charging stage of the rechargeable battery, and the preset cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameters of the rechargeable battery.
Optionally, the rechargeable battery includes a plurality of single batteries.
It is to be noted that when the SOC is 0, it indicates that the battery is fully discharged, and when the SOC is 1, it indicates that the battery is fully charged; when the SOC of the secondary battery is less than a predetermined value, the secondary battery needs to be charged, and the life of the secondary battery needs to be taken into consideration when charging, therefore, when charging the secondary battery, generally, when the SOC of the secondary battery reaches about 80%, the charging current starts to be reduced, and then charging is performed until the SOC of the secondary battery reaches 95% or more.
Therefore, before charging the secondary battery, it is necessary to determine the maximum cut-off voltage based on the electrical parameter of the secondary battery and the preset SOC, so that the life of the secondary battery can be extended.
And S204, controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches a preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between the first charging stage and the last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage.
It has been determined in the above step S202 that there has been at least one cell across which the voltage reaches the predetermined cutoff voltage value in the rechargeable battery, that is, the rechargeable battery is charged to the predetermined medium voltage value in the first charging stage at the initial current value, for example, the SOC of the rechargeable battery has been made to reach 80%; the rechargeable battery is then required to be recharged with a small current to ensure the safety of the rechargeable battery.
Thus, in this embodiment, there is an intermediate charging phase of the rechargeable battery; the intermediate charging phase can be divided into a plurality of charging phases.
It should be noted that, in each of the intermediate charging stages, the current value may be adjusted, so as to charge the rechargeable battery with the adjusted current value. In the intermediate charging stage, it is required to ensure that the current value adjustment is requested only when the voltage across at least one single battery reaches a predetermined cut-off voltage value in each charging process.
That is, in the embodiment of the present invention, by improving the intermediate charging stage, the original way of charging the battery cells to the preset cut-off voltage value of the set battery cell for the first time with a larger current value and then sequentially reducing the current value is modified to reduce the current value to the preset cut-off voltage value after charging the battery cells to the preset cut-off voltage value of the set battery cell for the first time with a larger current value and then sequentially reducing the current value until the current value is reduced to the set current value, so that the average charging current in the SOC stage can be greatly increased, the charging time can be shortened, and the charging capacity can be basically not affected.
The current value may be sequentially adjusted by reducing the current value in steps.
Step S206, determining the adjusted current value as a preset current value, and controlling the rechargeable battery to enter the last charging stage.
As can be seen from the above, in the embodiment of the present invention, it may be determined that the voltage across at least one single battery in the rechargeable battery in the current charging phase reaches the predetermined cut-off voltage value, where the current charging phase is the first charging phase of the rechargeable battery, and the predetermined cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameter of the rechargeable battery; controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches a preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between a first charging stage and a last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage; and determining the adjusted current value as a preset current value, and controlling the rechargeable battery to enter the last charging stage, so that the purpose of reasonably charging the rechargeable battery is realized, and the technical effect of improving the charging efficiency is achieved.
Therefore, the charging processing method of the rechargeable battery provided by the embodiment of the invention solves the technical problem that the charging time is longer due to the adoption of a battery charging mode in the related technology.
In an optional embodiment, before determining that the voltage across at least one cell in the rechargeable battery in the current charging phase reaches the predetermined cutoff voltage value, the charging processing method of the rechargeable battery may further include: acquiring the electrical parameters of each single battery in the rechargeable battery; determining the highest cut-off voltage value of the rechargeable battery and the initial current value of the rechargeable battery based on the electrical parameters, wherein the initial current value is the current value when the rechargeable battery is charged in the first charging stage; and controlling the rechargeable battery to enter a first charging stage.
In the above-described embodiment, the electrical parameter of each unit cell may be a voltage value, a battery capacity, or the like of each unit cell. After obtaining the electrical parameters of each cell, the highest cutoff voltage value of the rechargeable battery and the initial current value of the rechargeable battery may be determined.
And during the first charging stage, charging the rechargeable battery at the initial charging current value until the voltage across at least one single battery in the rechargeable battery reaches a preset cut-off voltage value.
It should be noted that, in the embodiment of the present invention, the current value may be adjusted in various ways, and the following description is provided in conjunction with some ways.
In one aspect, in an alternative embodiment, the adjusting the charging current value of the rechargeable battery includes: determining a current adjustment mode corresponding to the initial current value based on a predetermined current value adjustment strategy, wherein the predetermined current value adjustment strategy is obtained by using a plurality of groups of training data through machine learning training, and each group of training data in the plurality of groups of training data comprises: an initial current value and a current adjustment mode corresponding to the initial current value; the charging current value of the rechargeable battery is adjusted in an intermediate charging phase based on the current adjustment mode.
In this embodiment, a balance point between the current value and the voltage drop when the current adjustment is performed after the rechargeable battery is charged to the predetermined cut-off voltage value is found, a predetermined current value adjustment strategy may be obtained by training in advance, and the current value may be adjusted reasonably based on the predetermined current value adjustment strategy, so that after the initial current value of the rechargeable battery is obtained, the current value may be adjusted reasonably, and the voltage drop value after the current adjustment is performed after the rechargeable battery is charged to the predetermined cut-off voltage value may not be too large.
In an optional embodiment, before determining the current adjustment mode corresponding to the initial current value based on the predetermined current value adjustment strategy, the charging processing method of the rechargeable battery further includes: acquiring a plurality of historical initial current values in a historical time period and a plurality of historical current adjustment modes corresponding to the plurality of historical initial current values; and training a plurality of groups of training data comprising a current regulation mode and a plurality of historical current regulation modes to obtain the current regulation mode.
That is, a large amount of historical data may be collected in advance to train the predetermined current value adjustment strategy.
In another aspect, adjusting a charging current value of a rechargeable battery includes: acquiring voltage drop data of the rechargeable battery, wherein the voltage drop data are voltage drop values of the rechargeable battery after the rechargeable battery is charged to a preset cut-off voltage value by different current values; determining a current adjustment mode for adjusting a charging current value of the rechargeable battery based on the initial current value and the voltage drop-back data; the charging current value of the rechargeable battery is adjusted based on the current adjustment mode.
In this embodiment, the rechargeable battery may be directly tested to obtain the voltage drop condition of the rechargeable battery after being charged at different current values, so that a more reasonable current adjustment mode can be found; for example, the initial current value is 100A, then the rechargeable battery may be charged with a current value of 100A in the first charging phase until there is at least one cell voltage across the cell that reaches a predetermined cutoff voltage value; then, the charging current value is decreased, for example, by 10A in sequence, so that the rechargeable battery can be charged at 90A, 80A, 70A until the current value decreases to a set current value, for example, 50A; therefore, the adjusted current value can be balanced between the charging time and the voltage loop data, and the charging time is reasonably shortened.
Fig. 3 is a schematic current-voltage diagram for charging a rechargeable battery according to an embodiment of the present invention, as shown in fig. 3, the rechargeable battery is first charged at 100A until the charging voltage value reaches a predetermined cut-off voltage value (e.g. 4.13V in fig. 3); the current value may then be sequentially adjusted down and the rechargeable battery may be charged with each adjusted current value until a predetermined cutoff voltage value is reached. It should be noted that, in the process of sequentially reducing the current value, the reduced current value is compared with a preset current value, and if the reduced current value is the preset current value, the rechargeable battery is directly charged by the preset current value until the charging is finished.
In an alternative embodiment, the initial current value is greater than the current value adjusted based on the current adjustment mode, and the current value adjusted each time based on the current adjustment mode gradually decreases until the preset current value is reached.
In an alternative embodiment, controlling the rechargeable battery to enter the last charging phase comprises: and controlling the rechargeable battery to be charged at a preset current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches a preset cut-off voltage value, and finishing charging.
The following describes in detail a charging processing method of a rechargeable battery according to an embodiment of the present invention with reference to the drawings.
Fig. 4 is a flowchart of an alternative charging processing method for a rechargeable battery according to an embodiment of the present invention, as shown in fig. 4, the charging is started, the battery management system BMS recognizes a current charging voltage value V, and when V is greater than a first voltage threshold value V1, the charging current value may be adjusted, as shown in fig. 4 as I1, and otherwise, the charging is performed at I0; charging in this manner is performed until there is at least one cell across which voltage in the rechargeable battery reaches a predetermined cutoff voltage value, i.e., V ═ Vmax (predetermined cutoff voltage value) in fig. 4, the battery management system BMS requests the current to start decreasing; charging In to the upper limit voltage Vmax for the first time; then the requested current value is decreased to In+1(wherein, I)n+1In), the current highest voltage of the battery core is reduced to Vn+1(wherein, Vn+1＜Vmax) (ii) a With In+1Is charged again to the upper limit voltage Vmax(ii) a Then request current to drop to In+2(wherein, I)n+2＜In+1) The current highest voltage of the battery core is reduced to Vn+2(wherein, Vn+1＜Vn+2＜Vmax) (ii) a And requesting the current to continuously reduce until the current is reduced to the set current In+mAnd with a current In+mCharging to VmaxAnd ending the charging.
As can be seen from the above, in the embodiment of the present invention, after the first charging with the larger current to the set upper limit voltage of the single battery cell, the stepped-down currents are sequentially charged to the upper limit voltage until the current is reduced to the set current In+mAnd stopping after full filling; the method can greatly improve the average charging current at the SOC stage, shorten the charging time and ensure that the charging electric quantity is not influenced basically.
By updating the traditional charging strategy formulation method provided by the embodiment of the invention, after the high current is charged to the set upper limit voltage of the single battery cell for the first time, the stepped-down current is sequentially charged to the upper limit voltage until the current is reduced to the set current and is cut off after being fully charged, so that the average charging current in the high SOC stage is increased, the charging time is shortened, the complaints of customers are reduced, the acceptance of the current market to electric vehicles is increased, and the new energy vehicles are popularized more quickly.
Example 2
According to another aspect of the embodiment of the present invention, there is also provided a charging processing apparatus for a rechargeable battery, and fig. 5 is a schematic diagram of the charging processing apparatus for a rechargeable battery according to the embodiment of the present invention, and as shown in fig. 5, the charging processing apparatus for a rechargeable battery may include: a first determination unit 51, a first control unit 53 and a second control unit 55. Next, a charging processing device for the rechargeable battery will be described.
A first determining unit 51, configured to determine that a voltage across at least one single battery in the rechargeable battery reaches a predetermined cut-off voltage value in a current charging phase, where the current charging phase is a first charging phase of the rechargeable battery, and the predetermined cut-off voltage value is a highest cut-off voltage value determined based on an electrical parameter of the rechargeable battery.
The first control unit 53 is configured to control the rechargeable battery to enter an intermediate charging stage, adjust a charging current value of the rechargeable battery, and charge the rechargeable battery by using the adjusted current value until a voltage across at least one single battery in the rechargeable battery reaches a predetermined cut-off voltage value, and enter a next charging stage, where the intermediate charging stage is a charging stage between the first charging stage and a last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage.
And the second control unit 55 is configured to determine that the adjusted current value is the preset current value, and control the rechargeable battery to enter the last charging phase.
It should be noted here that the first determining unit 51, the first controlling unit 53 and the second controlling unit 55 correspond to steps S202 to S206 in embodiment 1, and the units are the same as the examples and application scenarios realized by the corresponding steps, but are not limited to the disclosure in embodiment 1. It should be noted that the above-described elements as part of an apparatus may be implemented in a computer system, such as a set of computer-executable instructions.
As can be seen from the above, in the above embodiments of the present application, it may be determined by the first determining unit that the voltage across at least one single battery in the rechargeable battery reaches the predetermined cut-off voltage value in the current charging phase, where the current charging phase is the first charging phase of the rechargeable battery, and the predetermined cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameter of the rechargeable battery; controlling the rechargeable battery to enter an intermediate charging stage by using a first control unit, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches a preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between the first charging stage and the last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage; and determining the adjusted current value as a preset current value by using a second control unit, and controlling the rechargeable battery to enter the last charging stage. The charging processing device for the rechargeable battery provided by the embodiment of the invention achieves the purpose of reasonably charging the rechargeable battery, achieves the technical effect of improving the charging efficiency, and further solves the technical problem that the charging time is longer due to the adoption of a battery charging mode in the related technology.
In an optional embodiment, the charging processing apparatus for a rechargeable battery further includes: the device comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring the electric parameters of each single battery in the rechargeable battery before the voltage of two ends of at least one single battery in the rechargeable battery in the current charging stage is determined to reach a preset cut-off voltage value; a third determining unit, configured to determine, based on the electrical parameter, a highest cut-off voltage value of the rechargeable battery and an initial current value of the rechargeable battery, where the initial current value is a current value when the rechargeable battery is charged in the first charging stage; and the third control unit is used for controlling the rechargeable battery to enter the first charging stage.
In an alternative embodiment, the first control unit comprises: a first determining module, configured to determine a current adjustment mode corresponding to an initial current value based on a predetermined current value adjustment strategy, where the predetermined current value adjustment strategy is obtained through machine learning training using multiple sets of training data, and each set of training data in the multiple sets of training data includes: an initial current value and a current adjustment mode corresponding to the initial current value; the first adjusting module is used for adjusting the charging current value of the rechargeable battery in the intermediate charging stage based on the current adjusting mode.
In an optional embodiment, the charging processing apparatus for a rechargeable battery further includes: the current adjustment module is used for determining a current adjustment mode corresponding to the initial current value according to a preset current value adjustment strategy; the training module is used for training a plurality of groups of training data including a current regulation mode and a plurality of historical current regulation modes to obtain the current regulation mode.
In an alternative embodiment, the first control unit comprises: the acquisition module is used for acquiring voltage drop data of the rechargeable battery, wherein the voltage drop data is a voltage drop value of the rechargeable battery after the rechargeable battery is charged to a preset cut-off voltage value by different current values; a second determination module for determining a current adjustment mode for adjusting a charging current value of the rechargeable battery based on the initial current value and the voltage drop-back data; and the second adjusting module is used for adjusting the charging current value of the rechargeable battery based on the current adjusting mode.
In an alternative embodiment, the initial current value is greater than the current value adjusted based on the current adjustment mode, and the current value adjusted each time based on the current adjustment mode gradually decreases until the preset current value is reached.
In an alternative embodiment, the second control unit comprises: and the control module is used for controlling the rechargeable battery to be charged at a preset current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches a preset cut-off voltage value, and the charging is finished.
Example 3
According to another aspect of the embodiment of the present invention, there is also provided an electric vehicle using the charging processing method of the rechargeable battery of any one of the above.
Example 4
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored computer program, wherein when the computer program is executed by a processor, the apparatus where the computer storage medium is located is controlled to execute the method for charging a rechargeable battery according to any one of the above.
Example 5
According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to execute a computer program, where the computer program executes a method for charging a rechargeable battery according to any one of the above methods.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for processing charging of a rechargeable battery, comprising:
determining that the voltage across at least one single battery in a rechargeable battery in a current charging stage reaches a preset cut-off voltage value, wherein the current charging stage is the first charging stage of the rechargeable battery, and the preset cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameters of the rechargeable battery;
controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches the preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between the first charging stage and the last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage;
and determining the adjusted current value as a preset current value, and controlling the rechargeable battery to enter the last charging stage.
2. The method of claim 1, further comprising, prior to determining that the voltage across the at least one cell of the rechargeable battery in the current charging phase reaches the predetermined cutoff voltage value:
acquiring the electrical parameters of each single battery in the rechargeable battery;
determining a highest cut-off voltage value of the rechargeable battery and an initial current value of the rechargeable battery based on the electrical parameter, wherein the initial current value is a current value when the rechargeable battery is charged in the first charging stage;
and controlling the rechargeable battery to enter the first charging stage.
3. The method of claim 2, wherein adjusting the charging current value of the rechargeable battery comprises:
determining a current adjustment mode corresponding to the initial current value based on a predetermined current value adjustment strategy, wherein the predetermined current value adjustment strategy is obtained by machine learning training using a plurality of sets of training data, and each set of training data in the plurality of sets of training data comprises: an initial current value and a current adjustment mode corresponding to the initial current value;
adjusting a charging current value of the rechargeable battery in the intermediate charging phase based on the current adjustment mode.
4. The method of claim 3, further comprising, prior to determining a current adjustment mode corresponding to the initial current value based on a predetermined current value adjustment strategy:
acquiring a plurality of historical initial current values in a historical time period and a plurality of historical current adjustment modes corresponding to the plurality of historical initial current values;
and training a plurality of groups of training data comprising the current regulation mode and the plurality of historical current regulation modes to obtain the current regulation mode.
5. The method of claim 2, wherein adjusting the charging current value of the rechargeable battery comprises:
acquiring voltage drop data of the rechargeable battery, wherein the voltage drop data is a voltage drop value of the rechargeable battery after the rechargeable battery is charged to the preset cut-off voltage value by different current values;
determining a current adjustment mode for adjusting a charging current value of the rechargeable battery based on the initial current value and the voltage drop-back data;
adjusting a charging current value of the rechargeable battery based on the current adjustment mode.
6. The method according to claim 3 or 5, wherein the initial current value is larger than the current value adjusted based on the current adjustment mode, and the current value adjusted each time based on the current adjustment mode is gradually decreased until the preset current value is reached.
7. The method of claim 6, wherein controlling the rechargeable battery to enter the last charging phase comprises:
and controlling the rechargeable battery to be charged at the preset current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches the preset cut-off voltage value, and finishing charging.
8. A charge processing device for a rechargeable battery, comprising:
the device comprises a first determining unit, a second determining unit and a control unit, wherein the first determining unit is used for determining that the voltage across at least one single battery in a rechargeable battery reaches a preset cut-off voltage value in a current charging stage, the current charging stage is the first charging stage of the rechargeable battery, and the preset cut-off voltage value is the highest cut-off voltage value determined based on the electrical parameters of the rechargeable battery;
the first control unit is used for controlling the rechargeable battery to enter an intermediate charging stage, adjusting the charging current value of the rechargeable battery, charging the rechargeable battery by using the adjusted current value until the voltage at two ends of at least one single battery in the rechargeable battery reaches the preset cut-off voltage value, and entering a next charging stage, wherein the intermediate charging stage is a charging stage between the first charging stage and the last charging stage of the rechargeable battery, and the next charging stage is a charging stage in the intermediate charging stage;
and the second control unit is used for determining the adjusted current value as a preset current value and controlling the rechargeable battery to enter the last charging stage.
9. An electric vehicle, characterized in that the charging processing method of the rechargeable battery according to any one of claims 1 to 7 is used.
10. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program is executed by a processor, the computer-readable storage medium controls an apparatus to perform the method of charging a rechargeable battery according to any one of claims 1 to 7.
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