CN112531822B - Battery equalization method and device - Google Patents
Battery equalization method and device Download PDFInfo
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- CN112531822B CN112531822B CN202011328927.XA CN202011328927A CN112531822B CN 112531822 B CN112531822 B CN 112531822B CN 202011328927 A CN202011328927 A CN 202011328927A CN 112531822 B CN112531822 B CN 112531822B
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H01M10/443—Methods for charging or discharging in response to temperature
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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
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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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
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the invention provides a battery equalization method and a battery equalization device, which are implemented by obtaining a first electric quantity of a first battery pack; if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, the voltage of each monomer of the first battery pack is obtained, and the monomer needing to be opened and the monomer needing to be closed for balancing are determined according to the voltage of each monomer; if the first electric quantity is larger than the preset lower limit value and smaller than the preset upper limit value, obtaining the monomer electric quantity of each monomer of the first battery pack, and determining the monomer needing to be opened and the monomer needing to be closed for balancing according to the monomer electric quantity of each monomer; and equalizing the monomers needing to be opened and equalized, and closing and equalizing the monomers needing to be closed and equalized. According to the invention, the charge quantity and the voltage of each monomer are balanced by using different methods in a sectionalized way according to the charge quantity of each monomer in the battery pack, and the charge quantity and the voltage of each monomer are balanced with high precision, so that the charge quantity and the voltage of each monomer are balanced, and the balancing efficiency is improved to the greatest extent.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery equalization method and device.
Background
Along with the increasingly abundant functions of electronic devices, the frequency of using the electronic devices by people is also becoming frequent, so that the power consumption of the electronic devices is increased, and the endurance of the electronic products becomes an important index of the current electronic products. The cruising ability of the electronic product depends on the capacitance of the battery, and currently, the capacitance of a single battery core (hereinafter referred to as a single unit) is smaller, so that in order to improve the cruising ability of the battery, a plurality of single units are generally connected in series or in parallel to form a battery pack. Because each monomer is independently charged and discharged, the charge quantity of the monomer is also independent, and the situation that the charge quantity of part of the monomers is too high occurs in the use process of the battery pack. In order to ensure that the battery pack has good electricity storage and power supply capacity, the battery management system needs to monitor the electric charge quantity and voltage of each single body of the battery pack and balance the electric charge quantity and voltage of each single body, so that the difference between the electric charge quantity of each single body in the battery pack is smaller, and the difference between the electric charge quantity and the voltage is smaller, namely the electric charge quantity and the voltage are balanced.
The current equalizing method generally calculates the consumed electric charge of the monomer according to an ampere-hour integrating method and divides the electric charge by the rated capacity, thereby calculating the proportion of the current electric charge to the rated capacity. The simple ampere-hour integration method can realize the calculation accuracy of 5-10% when the electric charge quantity of the monomer is in the middle electric charge quantity interval, and the accuracy is poor under the condition of higher and lower electric charge quantity.
Disclosure of Invention
The embodiment of the invention aims to provide a battery balancing method and device, so that the electric charge quantity and voltage of each monomer are balanced by different methods in a sectionalized way according to the electric charge quantity of each monomer in a battery pack, the electric charge quantity and voltage of each monomer are balanced with high precision, the electric charge quantity and voltage of each monomer are balanced, and the balancing efficiency is improved to the greatest extent. The specific technical scheme is as follows:
in a first aspect, a battery equalization method includes:
obtaining a first electric quantity of a first battery pack;
if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, the voltage of each monomer of the first battery pack is obtained, and the monomer needing to be opened and the monomer needing to be closed for balancing are determined according to the voltage of each monomer;
if the first electric quantity is larger than the preset lower limit value and smaller than the preset upper limit value, obtaining the monomer electric quantity of each monomer of the first battery pack, and determining a monomer needing to be opened for balance and a monomer needing to be closed for balance according to the monomer electric quantity of each monomer;
and balancing the monomer which needs to be balanced, and closing and balancing the monomer which needs to be balanced.
With reference to the first aspect, in certain optional embodiments, the method further comprises: and controlling the current of the equalization circuit of the monomer which is being equalized according to the number of the monomer which is being equalized and/or the temperature of the circuit board carrying each equalization circuit so as to improve the equalization efficiency.
In combination with the above embodiment, in some optional embodiments, the controlling the current of the equalizing circuit of the equalizing unit according to the number of the equalizing unit and/or the temperature of the circuit board carrying each equalizing circuit to improve the equalizing efficiency includes:
obtaining the number of monomers currently being equalized and the temperature of the circuit board carrying each equalization circuit;
and if the number is larger than a preset number threshold or the temperature is larger than a preset temperature threshold, adjusting the conduction current of the equalization circuit of the monomer which is being equalized so as to control the current of the equalization circuit to be matched with the number and the temperature, thereby improving the equalization efficiency.
In combination with the above embodiment, in some optional embodiments, the controlling the current of the equalization circuit to match the number and the temperature by adjusting the on-current of the equalization circuit of the monomer being equalized, includes:
And adjusting the on-current of the equalization circuit by adjusting the duty ratio of the MOS tube of the equalization circuit of the monomer which is being equalized, thereby controlling the current of the equalization circuit to be matched with the quantity and the temperature so as to improve the equalization efficiency.
With reference to the first aspect, in some optional embodiments, the obtaining the first power of the first battery pack includes:
obtaining the standing time of a first battery pack, wherein the standing time is the current continuous power-down time length of the first battery pack;
judging whether the standing time is larger than a preset standing threshold value, and if so, obtaining the first electric quantity in a memory;
otherwise, obtaining a statically calibrated first electric quantity of the first battery pack, and taking the statically calibrated first electric quantity as the first electric quantity, wherein the first electric quantity in the memory is an actual electric quantity stored in the memory, and the statically calibrated first electric quantity is an electric quantity obtained by weighting and calibrating the actual electric quantity and an electric quantity obtained according to an electric quantity-voltage curve lookup table.
With reference to the first aspect, in some optional embodiments, the determining, according to the voltage of each monomer, a monomer that needs to be balanced on and a monomer that needs to be balanced off includes:
Determining a target voltage according to the voltages of the monomers, wherein the target voltage is the minimum voltage of the voltages of the monomers or the average voltage of the voltages of the monomers;
calculating the difference between the voltage of each monomer and the target voltage;
and determining the monomer with the difference larger than a preset voltage threshold as the monomer needing to be balanced, and determining the monomer with the difference smaller than the preset voltage threshold as the monomer needing to be balanced.
With reference to the first aspect, in some optional embodiments, the obtaining the monomer electric quantity of each monomer of the first battery pack, determining, according to the monomer electric quantity of each monomer, a monomer that needs to be balanced to be opened and a monomer that needs to be balanced to be closed includes:
determining the minimum monomer electric quantity from the monomer electric quantity of each monomer;
determining first differences between the monomer electric quantity of each monomer and the minimum monomer electric quantity respectively, wherein the monomer electric quantity of each monomer is other than the minimum monomer electric quantity;
calculating second differences between the voltages of the monomers and average voltages, wherein the average voltages are the average voltages of the monomers of the first battery pack;
Determining the monomer with the first difference larger than a preset first threshold value and the second difference larger than a preset second threshold value as a monomer needing to be balanced;
and determining other monomers except the monomer needing to be balanced on as monomers needing to be balanced off.
With reference to the first aspect, in some optional embodiments, the first power level is a minimum power level of the power levels of the respective cells of the first battery pack or an average power level of the power levels of the respective cells of the first battery pack.
With reference to the first aspect, in certain optional embodiments, the method further comprises: if the voltage of the monomer is smaller than the lower voltage limit value or larger than the upper voltage limit value, determining that the monomer with the voltage smaller than the lower voltage limit value or larger than the upper voltage limit value is the monomer needing to be closed and balanced.
In a second aspect, a battery equalization apparatus includes: the device comprises a first electric quantity obtaining unit, a voltage unit, a single electric quantity unit and an equalizing unit;
the first electric quantity obtaining unit is configured to obtain a first electric quantity of a first battery pack;
the voltage unit is configured to obtain the voltage of each monomer of the first battery pack if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, and determine the monomer needing to be balanced to be opened and the monomer needing to be balanced to be closed according to the voltage of each monomer;
The monomer electric quantity unit is configured to obtain monomer electric quantities of all the monomers of the first battery pack if the first electric quantity is larger than the preset lower limit value and smaller than the preset upper limit value, and determine a monomer needing to be balanced to be opened and a monomer needing to be balanced to be closed according to the monomer electric quantities of all the monomers;
the balancing unit is configured to perform balancing on the monomer needing to be balanced, and closing balancing on the monomer needing to be balanced.
The embodiment of the invention provides a battery equalization method and device, which are implemented by obtaining a first electric quantity of a first battery pack; if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, the voltage of each monomer of the first battery pack is obtained, and the monomer needing to be opened and the monomer needing to be closed for balancing are determined according to the voltage of each monomer; if the first electric quantity is larger than the preset lower limit value and smaller than the preset upper limit value, obtaining the monomer electric quantity of each monomer of the first battery pack, and determining a monomer needing to be opened for balance and a monomer needing to be closed for balance according to the monomer electric quantity of each monomer; and balancing the monomer which needs to be balanced, and closing and balancing the monomer which needs to be balanced. Therefore, the invention can balance the electric charge quantity and the voltage of each monomer by using different methods in a sectionalized way according to the electric charge quantity of each monomer in the battery pack, and balance the electric charge quantity and the voltage of each monomer with high precision, so that the electric charge quantity and the voltage of each monomer are balanced, and the balance efficiency can be improved to the greatest extent. Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a battery equalization circuit.
Fig. 2 is a flowchart of a battery equalization method provided by the present invention;
FIG. 3 is a schematic diagram of voltage-electricity curve of the monomer according to the present invention;
fig. 4 is a schematic structural diagram of a battery equalization device according to the present invention;
fig. 5 is a schematic structural diagram of an apparatus according to the present invention.
Detailed Description
The battery equalization circuit provided by the invention is shown in fig. 1, the battery management system in fig. 1 can be a software-level system, and the battery management system executes the method provided by the invention, so that the single body to be equalized is determined and an equalization signal is output to the circuit board P of the equalization circuit. The hardware devices running the battery management system may communicate with the circuit board P by wired or wireless means.
C1, C2, C3, and C4 in fig. 1 are 4 monomers of the first battery pack, respectively. R1, R2, R3, R4 and R5 are all resistors. MOS1, MOS2, MOS3 and MOS4 are all MOS tubes. For a single body, it is equalized by an equalization loop. For example, taking the monomer C1 as an example, the monomer C1, the resistor R2 and the MOS transistor MOS1 form an equalizing loop for equalizing the monomer C1.
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.
As shown in fig. 2, the present invention provides a battery equalization method, comprising:
s100, obtaining first electric quantity of a first battery pack;
alternatively, the execution body of the present invention may be a battery management system, and the first battery pack may be a battery pack including any number of monomers, which the present invention is not limited to.
Optionally, the battery management system may monitor the current remaining power of each monomer of the first battery pack in real time, and may calculate the average power of the monomers of the battery pack according to the current remaining power of each monomer included in the first battery pack. That is, the first electric quantity may be the minimum electric quantity of the electric quantities of the first battery pack or the average electric quantity of the electric quantities of the first battery pack, which is not limited in the present invention.
It will be appreciated that the purpose of the present invention is to equalize the charge and voltage of each cell, but not all cells need to be equalized. Therefore, the first electric quantity is required to be obtained as the reference electric quantity, so that whether each monomer needs to be balanced or not can be determined by referring to the first electric quantity, and the invention is not limited to the situation that the monomer needs to be balanced is determined.
Optionally, the battery management system may monitor, in real time, the current remaining capacity of each monomer of each battery pack, and store an electric capacity-voltage curve or a voltage-electric capacity curve of each monomer, where the electric capacity-voltage curve or the voltage-electric capacity curve may be obtained and stored through a test in advance, so as to find a corresponding relationship between the current remaining capacity of each monomer and the open circuit voltage through the electric capacity-voltage curve or the voltage-electric capacity curve, that is, if the current remaining capacity of each monomer is obtained, the corresponding voltage may be obtained by looking up a table, or if the current voltage of each monomer is obtained, the corresponding electric capacity may be obtained by looking up a table.
In combination with the embodiment shown in fig. 2, in some alternative embodiments, the step S100 includes:
step one, obtaining standing time of a first battery pack, wherein the standing time is the current continuous power-down time length of the first battery pack;
For a specific battery pack, the electric quantity and voltage of each cell of the battery pack are greatly changed during non-standing periods, and the electric quantity and voltage during the periods are not suitable for judging whether each cell needs to be balanced or not. For example, during the discharge of the battery pack, the electric quantity of each cell is continuously decreasing, and the voltage is continuously decreasing. Or during charging, the electric quantity of each monomer is continuously increased, and the voltage is also continuously increased.
The current length of time for continuous power down of the first battery pack can be understood as: the period of time from when the battery pack high voltage circuit is disconnected to when the high voltage circuit is closed again (chargeable or externally powered). That is, the length of time from the time when the first battery pack stops charging to the time when the first battery pack is charged again or externally supplied with power is cut off, or the length of time from the time when the first battery pack stops discharging to the time when the first battery pack is charged again or externally supplied with power is cut off. I.e., the length of time that the first battery pack continues to remain in a stationary state (a non-charged state and a non-externally powered state).
Alternatively, the battery management system may record the current length of time for continuous power down of the first battery pack in order to perform subsequent steps based on the length of time.
Judging whether the standing time is larger than a preset standing threshold value, and if so, obtaining the first electric quantity in a memory;
optionally, the preset standing threshold may be an ideal value obtained through a test, and the preset standing threshold may be used to determine whether a specific battery pack has been fully standing, because the electric quantity and voltage of each monomer of the fully standing battery pack are relatively stable, the variation is not large, and the accuracy of the subsequent process is not affected.
Alternatively, if the rest time is greater than the preset rest threshold, it indicates that the first battery pack is fully rest, and the first electric quantity may be obtained to execute the subsequent steps.
Optionally, if the standing time is not greater than the preset standing threshold, it indicates that the first battery pack is not fully standing, and the electric quantity and voltage of each monomer of the first battery pack are not stable. Since the battery management system collects the actual real-time electric quantity and voltage of each single body, the first electric quantity collected and stored by the battery management system is not stable at this time, and if the first electric quantity is directly used for the subsequent steps, larger errors are easily caused, so that the following step three can be executed.
And thirdly, otherwise, obtaining a statically calibrated first electric quantity of the first battery pack, and taking the statically calibrated first electric quantity as the first electric quantity, wherein the first electric quantity in the memory is an actual electric quantity stored in the memory, and the statically calibrated first electric quantity is an electric quantity obtained by weighting and calibrating the actual electric quantity and the electric quantity obtained according to a table look-up of an electric quantity-voltage curve.
Alternatively, since the first electric power stored in the battery management system is collected in the case where the first battery pack has not been sufficiently left standing in step three, errors are easily caused. Therefore, after the first electric quantity is obtained from the battery management system and error is eliminated, the first electric quantity after error elimination is used as the first electric quantity in step S100. For example, the first amount of electricity stored in the battery management system may be statically calibrated to eliminate errors due to insufficient settling of the first battery pack.
It should be understood that the present invention is not limited to static calibration, and any way that can eliminate errors falls within the scope of the present invention. For example, the first electric quantity stored in the battery management system and the electric quantity obtained by looking up the table through the electric quantity-voltage curve or the electric quantity-voltage curve are weighted to obtain the calibrated first electric quantity, which is not limited in the present invention.
Alternatively, when the table is checked, the table can be checked according to the voltage of the monomer measured by the monomer voltage sensor, and then the electric quantity-voltage curve or the voltage-electric quantity curve is used for checking the table, so that the electric quantity of the corresponding monomer can be obtained.
S200, if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, obtaining the voltage of each monomer of the first battery pack, and determining the monomer needing to be opened and the monomer needing to be closed according to the voltage of each monomer;
the present invention adopts a segmented scheme to perform equalization on the first battery pack, and specifically can refer to a graph shown in fig. 3, where the electric quantity corresponding to the node N1 may be understood as a preset lower limit value, and the electric quantity corresponding to the node N2 may be understood as a preset upper limit value. As can be seen from fig. 3, the slopes of the curve from the origin to the node N1 and the curve after the node N2 are both large, that is, the voltage of the two curves varies greatly with the change of the electric quantity, and the two curves are hereinafter referred to as a linear stage. For the monomer in the linear stage, the scheme of step S200 may be adopted.
The slope of the curve from the node N1 to the node N2 is relatively small and gentle, and the curve from the node N1 to the node N2 is hereinafter referred to as a gentle stage. For the monomer at the gentle stage, the scheme of step S300 may be adopted.
Optionally, according to the invention, through a sectional scheme, different methods are adopted for judging whether the monomer needs to be balanced or not for the monomers in different stages, and the obtained result is relatively accurate by combining reality and objectivity.
In combination with the embodiment shown in fig. 2, in some alternative embodiments, the determining, according to the voltage of each monomer, the monomer that needs to be balanced on and the monomer that needs to be balanced off in step S200 includes:
determining a target voltage according to the voltage of each single body, wherein the target voltage is the minimum voltage in the voltage of each single body or the average voltage of the voltage of each single body;
alternatively, since the cell to be balanced needs to be determined from among the individual cells and the cell to be balanced needs to be turned off, the embodiment is determined according to the voltage. It is necessary to determine a target voltage as a reference voltage, and to determine each cell as a cell requiring equalization on or a cell requiring equalization off with reference to the target voltage.
Alternatively, if the minimum voltage among the voltages of the respective cells is taken as the target voltage, the target voltage may be directly obtained from the battery management system. If the average voltage of the voltages of the individual cells is taken as the target voltage, the voltages of the individual cells may be obtained from the battery management system and then the average voltage may be calculated. Of course, the corresponding functions may also be developed in a battery management system, which may calculate and store the average voltage of the voltages of the respective cells in addition to the voltages of the respective cells collected in real time.
Step five, calculating differences between the voltages of the monomers and the target voltages respectively;
alternatively, the difference between the voltage of a single cell and the target voltage may be expressed as whether the voltage of the single cell is "special". For example, a significantly higher voltage for a particular cell than the target voltage indicates that the cell needs to be equalized.
Optionally, any algorithm that can represent the difference between the monomer voltage and the target voltage falls within the scope of the present invention, which is not limited thereto. For example, the difference or ratio between the voltage of each cell and the target voltage can be calculated, and the difference between the voltage of each cell and the target voltage can be represented by the difference or ratio.
Alternatively, assuming that the first battery pack includes 10 cells, in the process of calculating the above-mentioned gap, the following two schemes may be adopted:
firstly, obtaining the voltages of 10 monomers of a first battery pack, finding out the minimum voltage from the voltages, and then calculating the difference between the voltages of the remaining 9 monomers and the minimum voltage; or obtaining the voltages of 10 single cells of the first battery pack, obtaining the average voltage of the voltages of 10 single cells, and then calculating the differences between the voltages of 10 single cells and the average voltage respectively. In the above manner, the voltages of the individual cells are obtained only once, and the implementation is relatively easy.
The second method includes obtaining the voltages of 10 cells of the first battery pack for the first time, finding out the minimum voltage (or calculating the average voltage, if the average voltage is the same, replacing the minimum voltage by the average voltage in the following steps of the embodiment) and the maximum voltage, and then calculating the difference between the maximum voltage and the minimum voltage, so as to determine that the cell corresponding to the maximum voltage is the cell needing to be balanced on or the cell needing to be balanced off. At this time, voltages of the remaining 9 cells stored in the battery management system are retrieved, a minimum voltage and a maximum voltage are found out therefrom, and then a difference between the maximum voltage and the minimum voltage is calculated, so that it is determined that the cell corresponding to the maximum voltage is a cell requiring to be balanced on or a cell requiring to be balanced off. And repeatedly cycling in this way, after determining that one monomer is the monomer needing to be balanced on or the monomer needing to be balanced off each time, the voltage of the rest monomers is obtained again until all 10 monomers are determined.
Step six, determining that the monomer with the difference larger than a preset voltage threshold is the monomer needing to be balanced, and determining that the monomer with the difference smaller than the preset voltage threshold is the monomer needing to be balanced.
Optionally, the difference represents a difference between the voltage of each monomer and the target voltage, if the difference is greater than a preset voltage threshold, the voltage of the monomer corresponding to the difference is indicated to be more "special", so that the monomer corresponding to the difference can be determined to be the monomer needing to be opened for balancing, otherwise, the monomer corresponding to the difference is determined to be the monomer needing to be closed for balancing.
Optionally, the present invention does not limit the manner of determining whether the difference is greater than a preset voltage threshold, and any feasible manner falls within the scope of the present invention. For example, a difference or ratio of the gap to the preset voltage threshold may be calculated to determine whether the gap is greater than the preset voltage threshold.
S300, if the first electric quantity is larger than the preset lower limit value and smaller than the preset upper limit value, obtaining the monomer electric quantity of each monomer of the first battery pack, and determining a monomer needing to be opened for balancing and a monomer needing to be closed for balancing according to the monomer electric quantity of each monomer;
it should be understood that the present embodiment is applicable to a monomer in a gentle stage, that is, a monomer in which the first electric quantity is greater than a preset lower limit value and less than a preset upper limit value.
Optionally, in the gentle stage, if the voltage or the electric quantity of the single body are not judged directly, because the voltage in the gentle region is basically horizontal, the voltage difference between the single bodies is very small, and the balance cannot be distinguished according to the voltage; the single electric quantity calculation error can lead to misjudgment simply according to the single electric quantity. Therefore, the invention combines the change of the monomer electric quantity and the change of the voltage, comprehensively judges, and can promote balanced and accurate control.
In combination with the embodiment shown in fig. 2, in some optional embodiments, the obtaining the monomer electric quantity of each monomer of the first battery pack in step S300, determining, according to the monomer electric quantity of each monomer, a monomer that needs to be balanced to be opened and a monomer that needs to be balanced to be closed includes:
step seven, determining the minimum monomer electric quantity from the monomer electric quantity of each monomer;
alternatively, in this embodiment, it may be determined that each monomer needs to be balanced on or balanced off according to the monomer electric quantity, so the minimum monomer electric quantity may be determined first, and the minimum monomer electric quantity is used as the reference electric quantity. Of course, the average electric quantity of the monomer electric quantity of each monomer can be determined, and the average electric quantity is taken as the reference electric quantity, which is not limited by the invention.
Step eight, determining first differences between other monomer electric quantities except the minimum monomer electric quantity in the monomer electric quantities of the monomers and the minimum monomer electric quantity respectively;
optionally, the first gap is determined so that each cell is a cell that needs to be balanced on or a cell that needs to be balanced off or other cells, such as a cell that maintains a current balanced state, can be determined based on the first gap. The manner in which the first gap is determined is not limiting to the invention, and any feasible manner is within the scope of the invention. For example, a difference or a ratio of the other monomer electric quantity other than the minimum monomer electric quantity to the minimum monomer electric quantity, respectively, may be regarded as the first difference.
Step nine, calculating second differences between the voltages of the monomers and average voltages, wherein the average voltages are the average voltages of the monomers of the first battery pack;
optionally, step nine may specifically include: obtaining the voltage of each monomer; calculating the average voltage of the voltages of the monomers; and calculating a second difference between the voltages of the monomers and the average voltage.
Alternatively, in step nine, the second difference between the voltage of each monomer and the minimum voltage of the voltages of each monomer may be calculated, which is not limited by the present invention.
Optionally, the specific scheme for calculating the second difference between the voltages of the monomers and the average voltage is not limited, and any feasible scheme belongs to the protection scope of the present invention. For example, the difference between the voltages of the individual cells and the average voltage is calculated and taken as a second difference, or the ratio between the voltages of the individual cells and the average voltage is calculated and taken as a second difference, or the variance between the voltages of the individual cells and the average voltage is calculated and taken as a second difference.
Step ten, determining the monomer with the first difference larger than a preset first threshold value and the second difference larger than a preset second threshold value as a monomer needing to be balanced;
and determining other monomers except the monomer needing to be balanced on as monomers needing to be balanced off.
Optionally, if the first difference is smaller than a preset first threshold and/or the second difference is smaller than a preset second threshold, determining that the monomers corresponding to the first difference and the second difference are monomers to be balanced.
And S400, balancing the monomer which needs to be balanced, and closing and balancing the monomer which needs to be balanced.
Alternatively, the term "equalization" as used herein is understood to mean the discharge treatment of the monomer to be equalized in order to reduce the charge and voltage of the monomer. For example, the equalization circuit of the single body is conducted, so that the equalization circuit consumes the electric quantity and voltage of the single body, and the electric quantity and voltage of the single body are reduced.
Optionally, the balancing of the monomer to be balanced is understood to be that if the current balanced state of the monomer to be balanced is a balanced state, the monomer to be balanced is maintained to be balanced; if the current equilibrium state of the monomer which needs to be balanced is a closed state, the balance can be started, so that the current equilibrium state of the monomer is changed from the closed state to the balanced state.
Optionally, closing equalization on the monomer to be closed and balanced can be understood that if the current equalization state of the monomer to be closed and balanced is a state in which equalization is being performed, closing equalization to enable the current equalization state of the monomer to be changed from the state in which equalization is performed to the closed state; if the current equilibrium state of the monomer which needs to be opened for equilibrium is the closed state, the current equilibrium state of the monomer is maintained to be the closed state.
In connection with the embodiment shown in fig. 2, in certain alternative embodiments, the method further comprises:
and step twelve, controlling the current of the equalization circuit of the monomer which is being equalized according to the number of the monomer which is being equalized and/or the temperature of the circuit board carrying each equalization circuit so as to improve the equalization efficiency.
Optionally, by monitoring and controlling the temperature of the circuit board, the balancing of the monomers can be performed to the maximum extent under the condition that the temperature of the circuit board is not out of standard, including the maximum increase of the current of the balancing circuit and/or the maximum increase of the number of the monomers being balanced. In this way, the efficiency of balancing the battery pack can be improved, and the present invention is not limited thereto.
In combination with the above embodiment, in some optional embodiments, the step twelve includes:
thirteenth, obtaining the number of the monomers currently being balanced and the temperature of the circuit board carrying each balancing circuit;
fourteen, if the number is greater than a preset number threshold or the temperature is greater than a preset temperature threshold, adjusting the conduction current of the equalization circuit of the monomer which is being equalized, so as to control the current of the equalization circuit to be matched with the number and the temperature, and further improve the equalization efficiency.
Alternatively, if the number is greater than a preset number threshold, the number of monomers being equalized may be reduced.
If the temperature is greater than the preset temperature threshold, the number of the monomers which are balanced and/or the conduction current of the balancing circuit of the monomers which are balanced can be reduced, so that the temperature is reduced, and the circuit board is prevented from being damaged due to exceeding of the temperature and the higher balancing efficiency is maintained.
If the number is greater than the preset number threshold and the temperature is greater than the preset temperature threshold, the number of the monomers which are being balanced and/or the conduction current of the balancing circuit of the monomers which are being balanced can be reduced, so that the temperature is reduced, and the higher balancing efficiency is maintained while the damage of the circuit board caused by the exceeding of the temperature is avoided.
Optionally, the battery management system may count the number of the current balancing monomers in real time, and may acquire the temperature of the circuit board through a temperature sensor on the circuit board, which is not limited in the present invention.
Optionally, since the temperature on the circuit board is affected by the current of the equalization circuit, the larger the current is, the higher the temperature is, and the current of the equalization circuit can be adjusted by referring to the number of the monomers under equalization, if the temperature is too high due to the number of the monomers under equalization, the current of the equalization circuit of each monomer under equalization can be properly reduced, and if the temperature is still within the safety range, the current of the equalization circuit can be properly increased or the number of the monomers under equalization can be increased.
In combination with the above embodiment, in some optional embodiments, the balancing circuit in step fourteen, by adjusting the on current of the balancing circuit of the balancing monomer, thereby controlling the current of the balancing circuit to match the number and the temperature, includes:
the on-current of the equalization circuit is adjusted by adjusting the duty ratio of the MOS tube of the equalization circuit of the monomer which is being equalized, so that the current of the equalization circuit is controlled to be matched with the quantity and the temperature, and the equalization efficiency is improved.
Optionally, in the equalizing circuit of this embodiment, the current of the equalizing circuit is regulated by using a MOS tube, and according to the conduction principle of the MOS tube, the magnitude of the conduction current passing through the MOS tube is limited by the resistance of the conduction channel of the MOS tube, and by adjusting the voltage of each pole of the MOS tube, the resistance of the channel can be changed, so as to adjust the current of the equalizing circuit.
In connection with the embodiment shown in fig. 2, in certain alternative embodiments, the method further comprises: if the voltage of the monomer is smaller than the lower voltage limit value or larger than the upper voltage limit value, determining that the monomer with the voltage smaller than the lower voltage limit value or larger than the upper voltage limit value is the monomer needing to be closed and balanced.
Alternatively, the lower voltage limit value in the present embodiment may be understood as a lower discharge voltage limit value, and the upper voltage limit value may be understood as an upper charge voltage limit value.
Optionally, based on the special performance of the single units, each single unit has an upper limit charge cutoff voltage and a lower limit discharge cutoff voltage, and the single unit can be linearly expanded to a larger area according to the graph, so that the single unit cannot exceed the upper limit charge cutoff voltage and the lower limit discharge cutoff voltage, otherwise, a fault is reported, and the power-down stage of the battery system is not balanced.
In step S200 in combination with the embodiment of fig. 2, the cell that needs to be balanced on and the cell that needs to be balanced off are determined according to the voltages of the respective cells. For the monomer being charged, whether the voltage of the monomer is larger than the upper limit value of the charging voltage can be judged first; for the discharging monomer, whether the voltage of the monomer is smaller than the lower limit value of the discharging voltage can be judged first, if the voltage of the discharging monomer is larger than the upper limit value of the charging voltage or the voltage of the discharging monomer is smaller than the lower limit value of the discharging voltage, the subsequent calculation is not needed, and the monomer is directly determined to be the monomer needing to be closed and balanced, so that the efficiency can be improved.
As shown in fig. 4, the present invention provides a battery equalization apparatus comprising: a first power obtaining unit 100, a voltage unit 200, a single power unit 300, and an equalizing unit 400;
the first power obtaining unit 100 is configured to obtain a first power of a first battery pack;
the voltage unit 200 is configured to obtain the voltage of each unit of the first battery pack if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, and determine a unit needing to be balanced to be opened and a unit needing to be balanced to be closed according to the voltage of each unit;
the monomer electric quantity unit 300 is configured to obtain monomer electric quantities of all the monomers of the first battery pack if the first electric quantity is greater than the preset lower limit value and less than the preset upper limit value, and determine a monomer needing to be balanced to be opened and a monomer needing to be balanced to be closed according to the monomer electric quantities of all the monomers;
the balancing unit 400 is configured to perform balancing on the monomer to be balanced, and perform closing balancing on the monomer to be balanced.
In connection with the embodiment shown in fig. 4, in some alternative embodiments, the apparatus further comprises: a current control unit;
The current control unit is configured to control the current of the equalization circuit of each equalization circuit according to the number of the current equalization units and/or the temperature of the circuit board carrying the equalization circuit, so as to improve the equalization efficiency.
In combination with the above embodiment, in certain alternative embodiments, the current control unit includes: a temperature obtaining subunit and a temperature matching subunit;
the temperature obtaining subunit is configured to obtain the number of the monomers currently being balanced and the temperature of the circuit board carrying each of the balancing circuits;
the temperature matching subunit is configured to execute the step of adjusting the conduction current of the equalization circuit of the monomer which is being equalized if the number is larger than a preset number threshold or the temperature is larger than a preset temperature threshold so as to control the current of the equalization circuit to be matched with the number and the temperature, thereby improving the equalization efficiency.
In combination with the above embodiment, in some optional embodiments, the temperature matching subunit performs adjustment of the on current of the balancing circuit of the balancing unit to control the current of the balancing circuit to match the number and the temperature, so as to improve the balancing efficiency:
The method specifically comprises the step of adjusting the on current of the equalization circuit by adjusting the duty ratio of the MOS tube of the equalization circuit of the monomer which is being equalized, so as to control the current of the equalization circuit to be matched with the quantity and the temperature, and improve the equalization efficiency.
In connection with the embodiment shown in fig. 4, in some alternative embodiments, the first power obtaining unit 100 includes: a settling time obtaining subunit, a settling time judging subunit, a first obtaining subunit and a second obtaining subunit;
the stationary time obtaining subunit is configured to perform obtaining a stationary time of a first battery pack, the stationary time being a current continuous power-down time length of the first battery pack;
a rest time judging subunit configured to perform judgment on whether the rest time is greater than a preset rest threshold, and if so, trigger the first obtaining subunit, and otherwise trigger the second obtaining subunit;
the first obtaining subunit is configured to obtain the first electric quantity in the memory;
the second obtaining subunit is configured to obtain a statically calibrated first electric quantity of the first battery pack, and take the statically calibrated first electric quantity as the first electric quantity, wherein the first electric quantity in the memory is an actual electric quantity stored in the memory, and the statically calibrated first electric quantity is an electric quantity obtained by weighting and calibrating the actual electric quantity and an electric quantity obtained by looking up a table according to an electric quantity-voltage curve.
In combination with the embodiment shown in fig. 4, in some alternative embodiments, the voltage unit 200 performs determining, according to the voltages of the respective monomers, a cell that needs to be balanced on and a cell that needs to be balanced off, and is specifically configured to perform:
determining a target voltage according to the voltages of the monomers, wherein the target voltage is the minimum voltage of the voltages of the monomers or the average voltage of the voltages of the monomers;
calculating the difference between the voltage of each monomer and the target voltage;
and determining the monomer with the difference larger than a preset voltage threshold as the monomer needing to be balanced, and determining the monomer with the difference smaller than the preset voltage threshold as the monomer needing to be balanced.
In combination with the embodiment shown in fig. 4, in some optional embodiments, the monomer power unit 400 is configured to obtain the monomer power of each monomer of the first battery pack, determine, according to the monomer power of each monomer, a monomer that needs to be balanced to be opened and a monomer that needs to be balanced to be closed, and specifically configured to perform:
determining the minimum monomer electric quantity from the monomer electric quantity of each monomer;
determining first differences between the monomer electric quantity of each monomer and the minimum monomer electric quantity respectively, wherein the monomer electric quantity of each monomer is other than the minimum monomer electric quantity;
Calculating second differences between the voltages of the monomers and average voltages, wherein the average voltages are the average voltages of the monomers of the first battery pack;
determining the monomer with the first difference larger than a preset first threshold value and the second difference larger than a preset second threshold value as a monomer needing to be balanced;
and determining other monomers except the monomer needing to be balanced on as monomers needing to be balanced off.
In connection with the embodiment shown in fig. 4, in some alternative embodiments, the apparatus further comprises: closing the monomer determining unit;
the closing monomer determining unit is configured to determine that the monomer whose voltage is smaller than the voltage lower limit value or larger than the voltage upper limit value is the monomer requiring closing equalization if the voltage of the monomer is smaller than the voltage lower limit value or larger than the voltage upper limit value.
The first power obtaining unit 100, the voltage unit 200, the single power unit 300, the equalization unit 400, and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to implement the corresponding functions.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, the electric charge quantity and the voltage of each monomer are balanced by different methods in a sectionalized way according to the electric charge quantity of each monomer in the battery pack by adjusting the inner core parameters, the electric charge quantity and the voltage of each monomer are balanced with high precision, the electric charge quantity and the voltage of each monomer are balanced, and the balancing efficiency can be improved to the greatest extent.
The embodiment of the invention provides a storage medium, on which a program is stored, which when executed by a processor, implements the battery equalization method.
The embodiment of the invention provides a processor which is used for running a program, wherein the battery balancing method is executed when the program runs.
As shown in fig. 5, an embodiment of the present invention provides an apparatus 70, where the apparatus 70 includes at least one processor 701, and at least one memory 702 and bus 703 connected to the processor 701; wherein, the processor 701 and the memory 702 complete communication with each other through the bus 703; the processor 701 is configured to invoke the program instructions in the memory 702 to perform the battery balancing method described above. The device herein may be a server, PC, PAD, cell phone, etc.
The present application also provides a computer program product adapted to perform a program initialized with the steps comprised by the above-mentioned battery balancing method when executed on a data processing device.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, the device includes one or more processors (CPUs), memory, and a bus. The device may also include input/output interfaces, network interfaces, and the like.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (8)
1. A battery equalization method, comprising:
obtaining a first electric quantity of a first battery pack;
if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, the voltage of each monomer of the first battery pack is obtained, and the monomer needing to be opened and the monomer needing to be closed for balancing are determined according to the voltage of each monomer, including: determining a target voltage according to the voltages of the monomers, wherein the target voltage is the minimum voltage of the voltages of the monomers or the average voltage of the voltages of the monomers; calculating the difference between the voltage of each monomer and the target voltage; determining that the monomer with the difference larger than a preset voltage threshold is the monomer needing to be balanced, and determining that the monomer with the difference not larger than the preset voltage threshold is the monomer needing to be balanced;
If the first electric quantity is greater than the preset lower limit value and less than the preset upper limit value, obtaining the monomer electric quantity of each monomer of the first battery pack, and determining the monomer needing to be opened for balance and the monomer needing to be closed for balance according to the monomer electric quantity of each monomer, wherein the method comprises the following steps: determining the minimum monomer electric quantity from the monomer electric quantity of each monomer; determining first differences between the monomer electric quantity of each monomer and the minimum monomer electric quantity respectively, wherein the monomer electric quantity of each monomer is other than the minimum monomer electric quantity; calculating second differences between the voltages of the monomers and average voltages, wherein the average voltages are the average voltages of the monomers of the first battery pack; determining the monomer with the first difference larger than a preset first threshold value and the second difference larger than a preset second threshold value as a monomer needing to be balanced; determining other monomers except the monomer needing to be balanced to be a monomer needing to be balanced to be closed;
and balancing the monomer which needs to be balanced, and closing and balancing the monomer which needs to be balanced.
2. The method according to claim 1, wherein the method further comprises: and controlling the current of the equalization circuit of the monomer which is being equalized according to the number of the monomer which is being equalized and/or the temperature of the circuit board carrying each equalization circuit so as to improve the equalization efficiency.
3. The method according to claim 2, wherein controlling the current of the equalization circuit of the cell being equalized to improve equalization efficiency according to the number of cells being equalized and/or the temperature of a circuit board carrying each of the equalization circuits, comprises:
obtaining the number of monomers currently being equalized and the temperature of the circuit board carrying each equalization circuit;
and if the number is larger than a preset number threshold or the temperature is larger than a preset temperature threshold, adjusting the conduction current of the equalization circuit of the monomer which is being equalized so as to control the current of the equalization circuit to be matched with the number and the temperature, thereby improving the equalization efficiency.
4. A method according to claim 3, wherein controlling the current of the equalization circuit to match the number and temperature by adjusting the on-current of the equalization circuit of the cell being equalized, comprises:
and adjusting the on-current of the equalization circuit by adjusting the duty ratio of the MOS tube of the equalization circuit of the monomer which is being equalized, thereby controlling the current of the equalization circuit to be matched with the quantity and the temperature so as to improve the equalization efficiency.
5. The method of claim 1, wherein obtaining the first charge of the first battery pack comprises:
obtaining the standing time of a first battery pack, wherein the standing time is the current continuous power-down time length of the first battery pack;
judging whether the standing time is larger than a preset standing threshold value, and if so, obtaining the first electric quantity in a memory;
otherwise, obtaining a statically calibrated first electric quantity of the first battery pack, and taking the statically calibrated first electric quantity as the first electric quantity, wherein the first electric quantity in the memory is an actual electric quantity stored in the memory, and the statically calibrated first electric quantity is an electric quantity obtained by weighting and calibrating the actual electric quantity and an electric quantity obtained according to an electric quantity-voltage curve lookup table.
6. The method of claim 1, wherein the first charge is a minimum of the individual charge of the first battery pack or an average of the individual charge of the first battery pack.
7. The method according to claim 1, wherein the method further comprises: if the voltage of the monomer is smaller than the lower voltage limit value or larger than the upper voltage limit value, determining that the monomer with the voltage smaller than the lower voltage limit value or larger than the upper voltage limit value is the monomer needing to be closed and balanced.
8. A battery equalization apparatus, comprising: the device comprises a first electric quantity obtaining unit, a voltage unit, a single electric quantity unit and an equalizing unit;
the first electric quantity obtaining unit is configured to obtain a first electric quantity of a first battery pack;
the voltage unit is configured to obtain voltages of all the monomers of the first battery pack if the first electric quantity is smaller than a preset lower limit value or larger than a preset upper limit value, and determine a monomer needing to be balanced to be opened and a monomer needing to be balanced to be closed according to the voltages of all the monomers, and includes: determining a target voltage according to the voltages of the monomers, wherein the target voltage is the minimum voltage of the voltages of the monomers or the average voltage of the voltages of the monomers; calculating the difference between the voltage of each monomer and the target voltage; determining that the monomer with the difference larger than a preset voltage threshold is the monomer needing to be balanced, and determining that the monomer with the difference not larger than the preset voltage threshold is the monomer needing to be balanced;
the monomer electric quantity unit is configured to execute that if the first electric quantity is greater than the preset lower limit value and less than the preset upper limit value, the monomer electric quantity of each monomer of the first battery pack is obtained, and a monomer needing to be opened for balancing and a monomer needing to be closed for balancing are determined according to the monomer electric quantity of each monomer, and the method comprises the following steps: determining the minimum monomer electric quantity from the monomer electric quantity of each monomer; determining first differences between the monomer electric quantity of each monomer and the minimum monomer electric quantity respectively, wherein the monomer electric quantity of each monomer is other than the minimum monomer electric quantity; calculating second differences between the voltages of the monomers and average voltages, wherein the average voltages are the average voltages of the monomers of the first battery pack; determining the monomer with the first difference larger than a preset first threshold value and the second difference larger than a preset second threshold value as a monomer needing to be balanced; determining other monomers except the monomer needing to be balanced to be a monomer needing to be balanced to be closed;
The balancing unit is configured to perform balancing on the monomer needing to be balanced, and closing balancing on the monomer needing to be balanced.
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| CN103529396A (en) * | 2013-10-25 | 2014-01-22 | 重庆长安汽车股份有限公司 | Estimating method for initial value of stage of charge of high-accuracy lithium ion battery |
| WO2019042355A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| CN110336343A (en) * | 2019-06-14 | 2019-10-15 | 安徽锐能科技有限公司 | A kind of SOC estimation method based on active equalization of battery |
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| CN103529396A (en) * | 2013-10-25 | 2014-01-22 | 重庆长安汽车股份有限公司 | Estimating method for initial value of stage of charge of high-accuracy lithium ion battery |
| WO2019042355A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| CN110336343A (en) * | 2019-06-14 | 2019-10-15 | 安徽锐能科技有限公司 | A kind of SOC estimation method based on active equalization of battery |
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