CN111509806A - Battery equalization management method, device, equipment and storage medium - Google Patents
Battery equalization management method, device, equipment and storage medium Download PDFInfo
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- CN111509806A CN111509806A CN202010354609.4A CN202010354609A CN111509806A CN 111509806 A CN111509806 A CN 111509806A CN 202010354609 A CN202010354609 A CN 202010354609A CN 111509806 A CN111509806 A CN 111509806A
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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
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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]
Abstract
The embodiment of the invention discloses a battery balance management method, a device, equipment and a storage medium. The method comprises the following steps: acquiring the SOC value and the voltage value of each battery monomer in the battery pack; determining whether the battery pack meets a preset balance condition or not according to the SOC value of each battery monomer; if the battery pack meets the preset balance condition, determining the current state of the battery pack according to the SOC value of each battery monomer; selecting the SOC value or the voltage value of a single battery as a balance control variable according to the current state of the battery pack; and carrying out balance management on the battery pack according to the balance control variable. The embodiment of the invention judges the current state of the battery pack according to the SOC value of the battery monomer, and selects the balance control variable which can represent the actual capacity of the battery pack according to the current state of the battery pack to carry out balance management on the battery pack, so that the state of the battery pack subjected to balance management can accurately reflect the actual state of the battery pack, and the accuracy and the qualification of the balance management on the battery pack are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of battery management, in particular to a battery equalization management method, device, equipment and storage medium.
Background
The direct current power supply system of the transformer substation is power supply equipment for providing direct current power supply for direct current loads such as relay protection, control, computer monitoring, emergency lighting, alternating current uninterruptible power supplies and the like. In order to ensure the reliability and safety of the direct-current power supply system of the transformer substation, the direct-current system is widely powered by a storage battery as a backup power supply under the condition that external alternating current is interrupted.
The storage battery has the advantages of good safety performance, low self-discharge rate, high energy density, long service life and the like, however, because the manufacturing process of each battery in the storage battery pack is different, the batteries have different physical properties such as self-discharge rate, internal resistance and the like, and after the batteries are charged and discharged for multiple cycles, serious inconsistency is generated in the voltage or the State of Charge (SOC) among the batteries. This phenomenon reduces the available capacity of the battery pack, leads to degradation of the battery, and also presents a safety hazard in the excessive charging and discharging of the battery. State of charge balancing batteries is the basis for preventing the above problems while extending the life of the batteries.
Most of the existing battery pack balancing methods perform balancing management based on the voltage of each battery, however, the battery balancing method based on the voltage cannot completely reflect the external characteristics of the battery capacity and the internal resistance.
Disclosure of Invention
The embodiment of the invention provides a battery equalization management method, a device, equipment and a storage medium, which are used for improving the inconsistency of batteries and optimizing the equalization efficiency.
In a first aspect, an embodiment of the present invention provides a battery balancing management method, including:
acquiring a state of charge (SOC) value and a voltage value of each battery cell in the battery pack;
determining whether the battery pack meets a preset balance condition or not according to the SOC value of each battery monomer;
if the battery pack meets a preset balance condition, determining the current state of the battery pack according to the SOC value of each battery monomer;
selecting the SOC value or the voltage value of the battery monomer as a balance control variable according to the current state of the battery pack;
and carrying out balance management on the battery pack according to the balance control variable.
In a second aspect, an embodiment of the present invention further provides a battery balancing management apparatus, including:
the parameter acquisition module is used for acquiring the SOC value and the voltage value of each battery monomer in the battery pack;
the judging module is used for determining whether the battery pack meets a preset balance condition according to the SOC value of each battery monomer;
the state determination module is used for determining the current state of the battery pack according to the SOC value of each battery monomer if the battery pack meets a preset balance condition;
the balance control variable determining module is used for selecting the SOC value or the voltage value of the single battery as a balance control variable according to the current state of the battery pack;
and the balance management module is used for carrying out balance management on the battery pack according to the balance control variable.
In a third aspect, an embodiment of the present invention further provides a battery balancing management device, including:
one or more processors;
storage means for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement the battery balancing management method according to any embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the battery balancing management method according to any embodiment of the present invention.
According to the battery management method provided by the embodiment of the invention, whether the battery pack is in the preset balance condition is judged according to the SOC value of the battery monomer in the battery pack so as to determine whether the battery pack needs to be subjected to balance management. When the battery pack needs to be subjected to balance management, the current state of the battery pack is judged according to the SOC values of the single batteries in the battery pack, because the battery pack is in different states, the SOC values and the voltage values of the single batteries in the battery pack have different change characteristics, and then balance control variables capable of truly representing the actual capacity of the battery pack are selected according to the current state of the battery pack to perform balance management on the battery pack, so that the state of the battery pack subjected to balance management can accurately reflect the actual state of the battery pack, the accuracy of the balance management on the battery pack is improved, and the consistency of the single batteries in the battery pack is improved.
Drawings
Fig. 1 is a flowchart of a battery management method according to an embodiment of the present invention;
fig. 2 is a flowchart of a battery equalization management method according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of fuzzy computation based on a triangular fuzzy membership function according to a second embodiment of the present invention;
FIG. 4 is a diagram of a balancing strategy corresponding to fuzzy relations in Table I according to a second embodiment of the present invention;
FIG. 5 is another schematic diagram of fuzzy computation based on triangular fuzzy membership function according to the second embodiment of the present invention;
FIG. 6 is a diagram of a balancing strategy corresponding to fuzzy relations in Table II according to a second embodiment of the present invention;
fig. 7 is a flowchart of a battery equalization management method according to a third embodiment of the present invention;
fig. 8 is a block diagram of a battery equalization management apparatus according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a battery balancing management device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The existing battery pack balancing methods are mainly divided into two types: a method of balance of dissipation and balance of non-dissipation. In the dissipation balance method, extra power is consumed by a resistor or other energy consuming elements to achieve the balance purpose, and the energy in the battery is consumed in the form of heat. The non-dissipative balancing method is to realize energy transfer between batteries by using energy storage elements such as capacitors, inductors or transformers. Non-dissipative balancing methods are mainly divided into two main categories: the equalization is performed based on the voltage and the equalization is performed based on the SOC of the battery. Most of the existing methods are voltage-based battery balancing, however, the voltage-based battery balancing method cannot completely reflect the external characteristics of the battery capacity and the internal resistance. Also, it is difficult to establish an accurate mathematical model of the battery pack because of the mutual influence between the battery cells in the battery pack.
In view of the above problems, an embodiment of the present invention provides a battery pack balancing method based on a Fuzzy Control theory, which dynamically adjusts a Control variable for balancing management of a battery pack according to a state of the battery pack, and adjusts a balancing current to balance a battery voltage or an SOC by using a Fuzzy Control method (Fuzzy L organic Control, F L C), so as to improve inconsistency of the battery and optimize balancing efficiency by using strong nonlinearity, robustness, adaptability and fault tolerance of F L C.
Example one
Fig. 1 is a flowchart of a battery management method according to an embodiment of the present invention, where the battery management method may be applied to balanced management of a storage battery, a lithium battery, and the like, and the method may be executed by a battery management apparatus, where the apparatus may be implemented in a software and/or hardware manner. As shown in fig. 1, the method specifically includes:
and S110, acquiring the state of charge (SOC) value and the voltage value of each battery cell in the battery pack.
The battery cell is a basic unit for storing electric quantity in the battery pack. After the battery pack is used for a period of time, the situation that the voltage values or the SOC values of the battery monomers are inconsistent may occur, at the moment, the SOC values or the voltage values of the battery monomers in the battery pack are obtained, and then the SOC difference or the voltage difference of the battery monomers is calculated, so that when the SOC difference or the voltage difference reaches a preset value, the battery monomers in the battery pack are subjected to balance adjustment, the service life of the battery pack can be prevented from being reduced, and the potential safety hazard of the battery pack is avoided.
And S120, determining whether the battery pack meets a preset balance condition according to the SOC value of each battery monomer.
The SOC value of the battery is obtained by comprehensively estimating the factors such as the voltage, the current, the ambient temperature, the internal resistance and the like of the battery, and represents the comprehensive performance of the battery, so that whether the battery pack needs to be subjected to balance adjustment at present can be more accurately judged according to the SOC value of each battery monomer.
And S130, if the battery pack meets the preset balance condition, determining the current state of the battery pack according to the SOC value of each battery monomer.
In this embodiment, the current state of the battery pack specifically refers to whether the battery pack is in a voltage plateau period. When the battery pack is in the voltage plateau period and is not in the voltage plateau period, the SOC and the voltage of each battery monomer in the battery pack have different change characteristics, so that the battery pack needs to be subjected to balance adjustment by selecting a proper balance control variable according to the current state of the battery pack.
When the battery pack is in the voltage plateau period, the SOC value of the battery can more accurately reflect the actual state of the battery pack, and the voltage plateau period of each battery pack has a determined SOC starting end value and a determined SOC end value, so that whether the battery pack is in the voltage plateau period can be determined by comparing the SOC values of the battery cells in the battery pack with the SOC starting end value and the SOC end value of the voltage plateau period respectively. The process can be specifically optimized as follows:
if all the SOC difference values are larger than or equal to the initial end value of the voltage plateau period of the battery pack and smaller than or equal to the terminal end value of the voltage plateau period, determining that the battery pack is currently in the voltage plateau period;
otherwise, determining that the battery pack does not belong to the voltage plateau currently.
Specifically, after determining the SOC difference between each adjacent battery cell, the maximum value and the minimum value of the SOC difference may be further determined, and the maximum value SOC of the SOC difference may be determined by determining the SOC differencemaxAnd minimum value SOCminRespectively corresponding to the start of the voltage plateau α1And end value α2By comparison, the following inequalities are satisfied:
α1≤SOCmin≤α2(1)
α1≤SOCmax≤α2(2)
it indicates that all the SOC difference values are between α1And α2In between, the battery pack is currently in a voltage plateau. Conversely, when the above equations cannot be simultaneously satisfied, it is determined that the battery pack does not currently belong to the voltage plateau.
For example, when the voltage values and SOC values of all ten cells in the battery pack are:
U＝[2.12、2.28、2.17、2.20、2.02、2.34、2.16、2.14、2.05、2.20]，
SOC＝[0.88、0.86、0.94、0.74、0.76、0.98、0.88、0.92、0.89、0.95]；
then SOCmax＝0.98，SOCmin0.76, when the voltage plateau begins α10.8, end value α2When the value is 1, the SOC is at the momentminNot satisfying (1), and thus the battery pack does not currently fall into the voltage plateau.
And S140, selecting the SOC value or the voltage value of the battery cell as a balance control variable according to the current state of the battery pack.
Specifically, if the battery pack is currently in a voltage platform period, selecting the SOC value of a battery monomer as a balance control variable;
otherwise, selecting the voltage value of the battery cell as the balance control variable.
When the battery is in the voltage plateau period, the consistency of the voltage among the battery monomers in the battery pack cannot accurately reflect the consistency of the SOC of the battery monomers, and even when the voltage difference of the battery monomers in the battery pack is not large, the SOC difference of the battery monomers can reach more than 50 percent, so that the consistency of the battery monomers is more reasonable to adjust and evaluate by taking the SOC value of the battery monomers as a balance control variable. When the battery pack is at the end of the voltage plateau period, the voltage of the battery monomers changes rapidly, and even though the SOC difference of each battery monomer is small, the voltage difference of each battery monomer is very obvious, so that the voltage is used as a balance control variable to perform balance adjustment at the stage, and the uniformity of each battery monomer is improved.
And S150, carrying out balance management on the battery pack according to the balance control variable.
In this embodiment, performing equalization management on the battery pack refers to performing equalization adjustment on each battery cell in the battery pack. For example, the first battery cell and the second battery cell in the battery pack are subjected to primary equalization adjustment, and then the second battery cell and the third battery cell are subjected to primary equalization adjustment, and the equalization adjustment is sequentially performed until all the battery cells in the battery pack are subjected to equalization adjustment. The balance adjustment among the battery cells can adopt dissipative balance or non-dissipative balance. For example, a balanced discharge circuit is arranged in the battery pack, each single battery is connected to the discharge circuit through a switch, when the single battery needs to be balanced and adjusted, the switch connected with the corresponding single battery is controlled to be conducted, one of the single batteries discharges the other single battery, and balanced adjustment between every two single batteries is achieved.
The principle of the battery management method is as follows: whether the battery pack needs to be balanced is determined according to the SOC value of each battery monomer in the battery pack, when the battery pack needs to be balanced and managed is judged, the current state of the battery pack is determined by taking the SOC value of each battery monomer as a judgment condition, and then a balance control variable for carrying out balance management on the battery pack is determined according to the current state of the battery pack, so that balance management on the battery pack is more consistent with the actual condition of the battery pack by selecting the balance control variable corresponding to the state of the battery pack to carry out balance management.
According to the battery management method provided by the embodiment of the invention, whether the battery pack is in the preset balance condition is judged according to the SOC value of the battery monomer in the battery pack so as to determine whether the battery pack needs to be subjected to balance management. When the battery pack needs to be subjected to balance management, the current state of the battery pack is judged according to the SOC values of the single batteries in the battery pack, because the battery pack is in different states, the SOC values and the voltage values of the single batteries in the battery pack have different change characteristics, and then balance control variables capable of truly representing the actual capacity of the battery pack are selected according to the current state of the battery pack to perform balance management on the battery pack, so that the state of the battery pack subjected to balance management can accurately reflect the actual state of the battery pack, the accuracy of the balance management on the battery pack is improved, and the consistency of the single batteries in the battery pack is improved.
Optionally, on the basis of the above technical solution, after performing equalization management on the battery pack according to the equalization control variable, the battery management method further includes:
determining the dispersion of the battery pack according to the balance control variable;
if the dispersion is smaller than or equal to a preset equalization finishing threshold value, determining that the battery pack reaches an equalization state, and finishing equalization management;
otherwise, the SOC value and the voltage value of each battery monomer in the battery pack are obtained again, whether the battery pack meets the preset balance condition or not is judged according to the obtained SOC value of each battery monomer, when the battery pack meets the preset balance condition, the state of the battery pack is updated, the balance control variable is updated based on the updated state of the battery pack, the battery pack is subjected to balance management based on the updated balance control variable, the dispersion of the battery pack is updated based on the updated balance control variable, and when the updated dispersion is not less than the preset balance ending threshold, the process is repeated until the dispersion of the battery pack is less than or equal to the preset balance ending threshold.
Specifically, the dispersion of the battery pack represents the consistency degree between the battery cells in the battery pack, and when the dispersion of the battery pack is smaller than or equal to the equalization end threshold, the battery pack is indicated to be in an equalization state, and at this time, equalization management is exited. Otherwise, the steps S110 to S150 are repeatedly executed to judge the equalization condition according to the re-collected SOC value of the battery monomer, and the equalization management is further carried out until the dispersion of the battery pack is less than or equal to the equalization finishing threshold value, and the equalization management is quitted.
Alternatively, the dispersion of the battery pack may be calculated according to the following formula:
in the formula: θ is the dispersion, SOC, of the battery packiIs the SOC value of the ith cell,
the SOC average value of the battery pack is shown, and N is the number of single batteries in the battery pack.
It should be noted that, in the present application, when the battery pack needs to be repeatedly managed in an equalization manner, the battery management device needs to obtain the SOC value and the voltage value of each battery cell in the battery pack again, and perform equalization condition judgment and state judgment of the battery pack according to the obtained SOC value and voltage value again, so as to select a corresponding equalization control variable according to a state change of the battery pack, implement equalization management of the battery pack based on an updated state of the battery pack, and improve accuracy of equalization management of the battery pack.
Example two
Fig. 2 is a flowchart of a battery equalization management method according to a second embodiment of the present invention, where the present embodiment is optimized based on the foregoing embodiment, and the method specifically includes:
s210, acquiring the state of charge (SOC) value and the voltage value of each battery cell in the battery pack.
And S220, determining whether the battery pack meets a preset balance condition according to the SOC value of each battery monomer.
The difference between the SOC values of the battery monomers can be calculated according to the SOC values of the battery monomers, so that whether the battery monomers meet the balance condition or not is judged according to the difference between the SOC values of the battery monomers.
Optionally, the process specifically includes:
determining the SOC difference value between each adjacent battery monomer in the battery pack according to the SOC value of each battery monomer;
if the difference value between the maximum value and the minimum value in the SOC difference values is larger than or equal to a preset equalization starting threshold value, determining that the battery pack meets a preset equalization condition;
otherwise, determining that the battery pack does not meet the preset equalization condition.
Specifically, the maximum SOC in the SOC difference values can be calculated according to the SOC difference values between the adjacent battery cellsmaxAnd minimum value SOCmin△ SOC can be calculated from equation (4)maxThen △ SOCmaxWhen the SOC is △, the comparison is carried out with the equilibrium opening threshold β (β is more than or equal to 0)maxAnd when the inequality (5) is met, indicating that the battery pack meets the preset equalization condition. The equalization starting threshold value can be selected according to the charge and discharge times of the battery pack in operation, the accuracy of equalization management on the battery pack and other factors.
△SOCmax＝SOCmax-SOCmin(4)
△SOCmax≥β (5)
For example, when the SOC values of all ten cells in the battery pack are:
SOC＝[0.88、0.86、0.94、0.74、0.76、0.98、0.88、0.92、0.89、0.95]；
△ SOC at this timemax0.98-0.76-0.32, and β -0.2, then △ SOCmaxAnd (5) when the condition is more than β, determining that the battery pack meets the preset equalization condition, and performing equalization management on the battery pack by the battery equalization management device.
And S230, if the battery pack meets the preset balance condition, determining the current state of the battery pack according to the SOC value of each battery monomer.
And S240, selecting the SOC value or the voltage value of the battery cell as a balance control variable according to the current state of the battery pack.
And S250, carrying out balance management on the battery pack according to the balance control variable.
The method specifically adopts a fuzzy control method to perform balance management on the battery pack, and improves the inconsistency of the battery pack and optimizes the balance efficiency by means of strong nonlinearity, robustness, adaptability and fault tolerance of the fuzzy control method. The following describes the equalization management of the battery pack in combination with two cases, namely, when the equalization control variable is the SOC value of the battery cell and the equalization control variable is the voltage value of the battery cell.
If the balance control variable is the SOC value of each battery monomer, determining the SOC difference value between each adjacent battery monomer in the battery pack and the SOC average value of the battery pack according to the SOC value of each battery monomer;
fuzzification calculation is carried out on the maximum value in the SOC difference value and the SOC mean value by adopting a fuzzy control method, and the membership degree of the maximum value in the SOC difference value and the membership degree of the SOC mean value are obtained;
determining a first excitation intensity to the balance current according to the membership degree of the maximum value in the SOC difference value and the membership degree of the SOC mean value;
determining a first equalization current from the first excitation intensity according to a preset fuzzy relation;
and carrying out balance management of preset duration on each adjacent battery monomer in the battery pack according to the first balance current.
Specifically, according to the parameters of the battery pack, the maximum value △ SOC in the SOC difference value of the battery pack can bemaxSOC mean value
And a first equalizing current Ieq1Respectively determining physical discourse domain to obtain maximum value △ SOC in SOC difference valuemaxFuzzy set, SOC mean of
And the first equalizing current Ieq1According to the fuzzy control method, the maximum value △ SOC in the SOC difference value is obtainedmaxFuzzy set and SOC mean of
Respectively carrying out fuzzy calculation on the fuzzy sets to obtain the membership degree corresponding to the maximum value of the current SOC difference value and the membership degree corresponding to the average value of the current SOC, and then carrying out △ SOC according to the maximum value in the preset SOC difference valuesmaxAnd SOC mean value
Fuzzy rule between, from maximum value △ SOC differencemaxDegree of membership and SOC mean
Calculates a first excitation intensity omega 1 according to the membership degree of the first excitation intensity omega 1, and then performs a first equalization on the current IeqAnd cutting the membership function to obtain a first equalization current value under a preset fuzzy relation, and performing equalization management on each adjacent battery monomer in the battery pack for a preset time length in sequence by using the first equalization current value.
Optionally, because the triangular fuzzy membership function has the characteristics of simple calculation, good control performance and the like, the triangular fuzzy membership function is adopted to perform fuzzy calculation in the embodiment to obtain the maximum value △ SOC of the SOC difference value corresponding to the current state of the battery packmaxDegree of membership and SOC mean value
Degree of membership.
In this embodiment, performing the equalization management of the preset duration on each adjacent battery cell in the battery pack in sequence means that the time for performing the equalization adjustment on each adjacent battery cell is a predetermined fixed value. For example, when the preset duration is 1ms, the first equalization current is used to perform equalization adjustment on the No. 1 battery cell and the No. 2 battery cell for 1ms respectively, and then the equalization adjustment on the No. 2 battery cell and the No. 3 battery cell for 1ms are performed in sequence until the equalization adjustment on the last two adjacent battery cells for 1ms is performed, so that the equalization management of the current time is completed.
Fig. 3 is a schematic diagram of fuzzy calculation based on a triangular fuzzy membership function according to a second embodiment of the present invention, where a first table is a fuzzy relationship corresponding table according to the second embodiment of the present invention, and fig. 4 is a balance strategy diagram corresponding to the fuzzy relationship in the first table according to the second embodiment of the present invention, referring to fig. 3, if the maximum value of the current SOC difference of the battery pack is 0.025, the current SOC average value of the battery pack is 0.45, and accordingly, the membership of the maximum value of the SOC difference is 0.5, and the membership of the SOC average value is 0.25; then, the first excitation intensity can be calculated to be 0.25, the first excitation intensity is used for cutting the membership function of the first equalization current, then, according to the fuzzy relation shown in the table I, the first equalization current at the moment can be determined to be 1.25A-2.75A, and any current value in the range is selected as the first equalization current to carry out equalization adjustment on each adjacent battery cell.
Optionally, if the equalization control variable is the voltage value of each battery cell, determining a voltage difference value between each adjacent battery cell in the battery pack and a voltage average value of the battery pack according to the voltage value of each battery cell;
fuzzification calculation is carried out on the maximum value and the voltage mean value in the voltage difference value by adopting a fuzzy control method, so that the membership degree of the maximum value and the membership degree of the voltage mean value in the voltage difference value are obtained;
determining a second excitation intensity for the equalizing current according to the membership degree of the maximum value in the voltage difference value and the membership degree of the voltage mean value;
determining a second equalizing current according to a preset fuzzy relation and a second excitation intensity;
and carrying out balance management of preset duration on each adjacent battery monomer in the battery pack according to the second balance current.
Specifically, the maximum value Δ U of the voltage difference is determined first, similarly to the above-described method using the SOC value as the equalization control variablemaxVoltage mean value
And a second equalizing current Ieq2To obtain the maximum value delta U of the voltage differencemaxFuzzy set, voltage mean of
And the second equalizing current Ieq2According to a fuzzy control method, the maximum value delta U of the voltage difference value is calculatedmaxFuzzy sets and voltage means of
Respectively carrying out fuzzy calculation on the fuzzy sets to obtain the membership degree corresponding to the maximum value of the current voltage difference value and the membership degree corresponding to the current voltage mean value, and then carrying out fuzzy calculation according to the maximum value delta U in the preset voltage difference valuesmaxAnd voltage mean value
Fuzzy rule between, from maximum value of voltage difference Δ UmaxDegree of membership and mean value of voltage
Calculates a second excitation intensity omega 2, and then balances the current I according to the second excitation intensity omega 2eq2And cutting the membership function to obtain a second equalization current value under a preset fuzzy relation, and performing equalization management on adjacent battery monomers for a preset time length in sequence by using the second equalization current value.
As an example, fig. 5 is another schematic diagram of performing fuzzy calculation based on a triangular fuzzy membership function according to the second embodiment of the present invention, where the second table is another fuzzy relation corresponding table according to the second embodiment of the present invention, and fig. 6 is a balancing strategy diagram corresponding to the fuzzy relation in the second table according to the second embodiment of the present invention, according to the above method, if the current voltage difference maximum value Δ U of the battery pack is determinedmaxIs 0.075, the current voltage average of the battery
2.15, according to fig. 5, it can be determined that the membership degree of the maximum value of the voltage difference at this time is 0.5, the membership degree of the voltage mean value is 0.75, then the corresponding second excitation intensity ω 2 at this time is 0.5, the membership function of the second equalization current is cut using the second excitation intensity, and then the second equalization current at this time can be determined to be 1A to 3A according to the fuzzy relation shown in table two, thereby selecting any current value in the range as the current valueAnd carrying out balance adjustment on each adjacent battery monomer in the battery pack for the second balance current value.
Watch two
And S260, determining the dispersion of the battery pack according to the balance control variable, and if the dispersion is smaller than or equal to a preset balance finishing threshold, determining that the battery pack reaches a balance state, and finishing balance management.
According to the battery equalization management method provided by the embodiment, when the battery pack is judged to need equalization management, the current state of the battery pack is judged according to the SOC value of a battery monomer in the battery pack, and a corresponding equalization control variable is selected according to the current state of the battery pack; fuzzification processing is carried out on the selected balance control variable through a fuzzy control method, the maximum value and the average value of the current balance control variable are used as front pieces of fuzzy control, balance current is used as back pieces of fuzzy control, the excitation strength of the two front pieces to the back pieces in the current state is obtained through fuzzy calculation, then the membership function of the excitation strength to the back pieces is used for cutting, balance current values corresponding to the current state are obtained, balance management is carried out on each adjacent battery monomer in the battery pack through the balance current values until each battery monomer in the battery pack meets the dispersion requirement, and balance management is stopped. In the embodiment, a fuzzy control method is introduced to perform equalization management on the battery pack, and the inconsistency of the battery pack is improved and the equalization efficiency of the battery pack is optimized by means of strong nonlinearity, robustness, adaptability and fault tolerance of the fuzzy control method.
EXAMPLE III
Fig. 7 is a flowchart of a battery equalization management method according to a third embodiment of the present invention, where the method includes:
and S710, starting.
S720, collecting the SOC value and the voltage value of the battery monomer.
And S730, judging whether to start automatic equalizing charge.
Determining the SOC difference value by using the SOC value of the single batteryMiddle maximum value SOCmaxAnd minimum value SOCmin△ SOC is calculated according to the following formulamax：
△SOCmax＝SOCmax-SOCmin(4)
When △ SOCmaxWhen the charging voltage is not less than β, starting automatic equalizing charge;
otherwise, repeating the step S720, and continuing to acquire the SOC value and the voltage value of the battery cell.
And S740, judging whether the SOC value of the battery monomer is in a voltage plateau period.
If the SOC value of the battery cell is in the voltage plateau, step S741 is executed, and the SOC value of the battery cell is used as a balancing condition for balancing; otherwise, the process proceeds to step S743, and equalization is performed using the voltage value of the battery cell as the equalization condition.
And S741, balancing by using the SOC value of the single battery as a balancing condition.
S742 selects an equalizing current by △ SOC according to the fuzzy control method.
And S743, balancing by using the voltage value of the battery cell as a balancing condition.
And S744, selecting an equalizing current through △ U according to a fuzzy control method.
And S750, judging whether the automatic equalizing charge is finished or not.
If the automatic equalizing charge has been completed, go to step S760; otherwise, step S720 is entered, the SOC value and the voltage value of the battery cell are collected again, and steps S730 to S750 are repeatedly executed based on the collected SOC value and the voltage value again, and the battery pack is subjected to equalization management until the automatic equalization charging is completed.
And S760, ending.
Example four
Fig. 8 is a block diagram of a battery balancing management apparatus according to a fourth embodiment of the present invention, where this embodiment is applicable to balancing management of a battery, and the apparatus may be implemented in a software or/and hardware manner. As shown in fig. 8, the battery balancing management apparatus provided in this embodiment may include a parameter obtaining module 810, a determining module 820, a state determining module 830, a balancing control variable determining module 840, and a balancing management module 850, where:
a parameter obtaining module 810, configured to obtain an SOC value and a voltage value of each battery cell in the battery pack;
a determining module 820, configured to determine whether the battery pack meets a preset equalization condition according to the SOC value of each battery cell;
a state determining module 830, configured to determine a current state of the battery pack according to the SOC value of each battery cell if the battery pack meets a preset equalization condition;
the equalization control variable determining module 840 is used for selecting the SOC value or the voltage value of the battery cell as the equalization control variable according to the current state of the battery pack;
and the balance management module 850 is used for performing balance management on the battery pack according to the balance control variable.
Optionally, the determining module 820 includes:
the SOC difference value acquisition unit is used for determining the SOC difference value between each adjacent battery monomer in the battery pack according to the SOC value of each battery monomer;
the judging unit is used for determining that the battery pack meets a preset balance condition if the difference value between the maximum value and the minimum value in the SOC difference values is larger than or equal to a preset balance starting threshold value; otherwise, determining that the battery pack does not meet the preset equalization condition.
Optionally, the state determining module 830 includes:
a state determining unit, configured to determine that the battery pack is currently in a voltage plateau period if all the SOC difference values are greater than or equal to a start end value of the voltage plateau period of the battery pack and less than or equal to an end value of the voltage plateau period; otherwise, determining that the battery pack does not currently belong to the voltage plateau.
Optionally, the equalization control variable determining module 840 includes:
the SOC value variable determining unit is used for selecting the SOC value of the battery monomer as a balance control variable if the battery pack is in a voltage plateau period currently;
and the voltage value variable determining unit is used for selecting the voltage value of the single battery as the balance control variable if the battery pack is not in the voltage plateau period currently.
Optionally, the balance management module 850 is specifically configured to:
if the balance control variable is the SOC value of each battery monomer, determining the SOC difference value between each adjacent battery monomer in the battery pack and the SOC average value of the battery pack according to the SOC value of each battery monomer;
fuzzification calculation is carried out on the maximum value in the SOC difference value and the SOC mean value by adopting a fuzzy control method, and the membership degree of the maximum value in the SOC difference value and the membership degree of the SOC mean value are obtained;
determining a first excitation intensity to the balance current according to the membership degree of the maximum value in the SOC difference value and the membership degree of the SOC mean value;
determining a first equalization current from the first excitation strength according to a preset fuzzy relation;
and carrying out balance management of preset duration on each adjacent battery monomer in the battery pack according to the first balance current.
Optionally, the balance management module 850 is further specifically configured to:
if the balance control variable is the voltage value of each battery monomer, determining the voltage difference value between each adjacent battery monomer in the battery pack and the voltage average value of the battery pack according to the voltage value of each battery monomer;
fuzzification calculation is carried out on the maximum value in the voltage difference value and the voltage mean value by adopting a fuzzy control method, and the membership degree of the maximum value in the voltage difference value and the membership degree of the voltage mean value are obtained;
determining a second excitation intensity for the equalizing current according to the membership degree of the maximum value in the voltage difference value and the membership degree of the voltage mean value;
determining a second equalizing current according to a preset fuzzy relation and the second excitation intensity;
and carrying out balance management of preset duration on each adjacent battery monomer in the battery pack according to the second balance current.
The battery equalization management device provided by the embodiment of the invention can execute the battery equalization management method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. Reference may be made to the description of any method embodiment of the invention not specifically described in this embodiment.
EXAMPLE five
Fig. 9 is a schematic structural diagram of a battery balancing management device according to a fifth embodiment of the present invention. Fig. 9 illustrates a block diagram of an exemplary battery equalization management apparatus 912 suitable for use in implementing embodiments of the present invention. The battery equalization management device 912 shown in fig. 9 is only an example, and should not bring any limitation to the functions and the use range of the embodiment of the present invention.
As shown in fig. 9, the battery equalization management apparatus 912 is represented in the form of a general purpose computing apparatus. The components of the battery equalization management device 912 may include, but are not limited to: one or more processors or processing units 916, a system memory 928, and a bus 918 that couples the various system components (including the system memory 928 and the processing unit 916).
Battery equalization management device 912 typically includes a variety of computer system readable media. These media may be any available media that is accessible by battery equalization management device 912 and includes both volatile and nonvolatile media, removable and non-removable media.
The system memory 928 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)930 and/or cache memory 932. Battery equalization management device 912 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 934 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 9, and typically referred to as a "hard disk drive"). Although not shown in FIG. 9, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk such as a Compact disk Read-Only Memory (CD-ROM), Digital Video disk Read-Only Memory (DVD-ROM) or other optical media may be provided. In these cases, each drive may be connected to the bus 918 through one or more data media interfaces. Memory 928 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the invention.
A program/utility 940 having a set (at least one) of program modules 942, which may include but are not limited to an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may include an implementation of a network environment, may be stored in, for example, the memory 928. The program modules 942 generally perform the functions and/or methodologies of the described embodiments of the invention.
Battery equalization management device 912 may also communicate with one or more external devices 914 (e.g., keyboard, pointing device, display 924, etc.), and may also communicate with one or more devices that enable a user to interact with battery equalization management device 912, and/or with any devices (e.g., network card, modem, etc.) that enable battery equalization management device 912 to communicate with one or more other computing devices.
The processing unit 916 executes various functional applications and data processing by running a program stored in the system memory 928, for example, implementing a battery balancing management method provided by an embodiment of the present invention, the method includes:
acquiring a state of charge (SOC) value and a voltage value of each battery cell in the battery pack;
determining whether the battery pack meets a preset balance condition or not according to the SOC value of each battery monomer;
if the battery pack meets the preset balance condition, determining the current state of the battery pack according to the SOC value of each battery monomer;
selecting the SOC value or the voltage value of a single battery as a balance control variable according to the current state of the battery pack;
and carrying out balance management on the battery pack according to the balance control variable.
EXAMPLE six
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement a battery balancing management method according to any embodiment of the present invention, where the method includes:
acquiring a state of charge (SOC) value and a voltage value of each battery cell in the battery pack;
determining whether the battery pack meets a preset balance condition or not according to the SOC value of each battery monomer;
if the battery pack meets the preset balance condition, determining the current state of the battery pack according to the SOC value of each battery monomer;
selecting the SOC value or the voltage value of a single battery as a balance control variable according to the current state of the battery pack;
and carrying out balance management on the battery pack according to the balance control variable.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CWROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including AN object oriented programming language such as Java, Smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A battery equalization management method, comprising:
acquiring a state of charge (SOC) value and a voltage value of each battery cell in the battery pack;
determining whether the battery pack meets a preset balance condition or not according to the SOC value of each battery monomer;
if the battery pack meets a preset balance condition, determining the current state of the battery pack according to the SOC value of each battery monomer;
selecting the SOC value or the voltage value of the battery monomer as a balance control variable according to the current state of the battery pack;
and carrying out balance management on the battery pack according to the balance control variable.
2. The battery balance management method according to claim 1, wherein the determining whether the battery pack satisfies a preset balance condition according to the SOC value of each battery cell includes:
determining the SOC difference value between each adjacent battery monomer in the battery pack according to the SOC value of each battery monomer;
if the difference value between the maximum value and the minimum value in the SOC difference values is larger than or equal to a preset equalization starting threshold value, determining that the battery pack meets a preset equalization condition;
otherwise, determining that the battery pack does not meet the preset equalization condition.
3. The battery balance management method according to claim 2, wherein the determining the current state of the battery pack according to the SOC value of each battery cell includes:
if all the SOC difference values are greater than or equal to the initial end value of the voltage plateau period of the battery pack and less than or equal to the terminal end value of the voltage plateau period, determining that the battery pack is currently in the voltage plateau period;
otherwise, determining that the battery pack does not currently belong to the voltage plateau.
4. The battery balance management method according to claim 3, wherein the selecting the SOC value or the voltage value of the battery cell as the balance control variable according to the current state of the battery pack comprises:
if the battery pack is in a voltage plateau stage currently, selecting the SOC value of a battery monomer as a balance control variable;
otherwise, selecting the voltage value of the battery cell as the balance control variable.
5. The battery balance management method according to claim 1, wherein the performing balance management on the battery pack according to the balance control variable includes:
if the balance control variable is the SOC value of each battery monomer, determining the SOC difference value between each adjacent battery monomer in the battery pack and the SOC average value of the battery pack according to the SOC value of each battery monomer;
fuzzification calculation is carried out on the maximum value in the SOC difference value and the SOC mean value by adopting a fuzzy control method, and the membership degree of the maximum value in the SOC difference value and the membership degree of the SOC mean value are obtained;
determining a first excitation intensity to the balance current according to the membership degree of the maximum value in the SOC difference value and the membership degree of the SOC mean value;
determining a first equalization current from the first excitation strength according to a preset fuzzy relation;
and carrying out balance management of preset duration on each adjacent battery monomer in the battery pack according to the first balance current.
6. The battery balance management method according to claim 1, wherein the performing balance management on the battery pack according to the balance control variable includes:
if the balance control variable is the voltage value of each battery monomer, determining the voltage difference value between each adjacent battery monomer in the battery pack and the voltage average value of the battery pack according to the voltage value of each battery monomer;
fuzzification calculation is carried out on the maximum value in the voltage difference value and the voltage mean value by adopting a fuzzy control method, and the membership degree of the maximum value in the voltage difference value and the membership degree of the voltage mean value are obtained;
determining a second excitation intensity for the equalizing current according to the membership degree of the maximum value in the voltage difference value and the membership degree of the voltage mean value;
determining a second equalizing current according to a preset fuzzy relation and the second excitation intensity;
and carrying out balance management of preset duration on each adjacent battery monomer in the battery pack according to the second balance current.
7. The battery balance management method according to claim 1, wherein after the balance management of the battery pack according to the balance control variable, the method further comprises:
determining the dispersion of the battery pack according to the balance control variable;
if the dispersion is smaller than or equal to a preset equalization finishing threshold value, determining that the battery pack reaches an equalization state, and finishing equalization management;
otherwise, the SOC value and the voltage value of each battery monomer in the battery pack are obtained again, whether the battery pack meets the preset balance condition is judged according to the SOC value of each battery monomer obtained again, when the battery pack meets the preset balance condition, the state of the battery pack is updated, a balance control variable is updated based on the updated state of the battery pack, the battery pack is subjected to balance management based on the updated balance control variable, the dispersion of the battery pack is updated based on the updated balance control variable, and when the updated dispersion is not less than the preset balance end threshold, the process is repeated until the dispersion of the battery pack is less than or equal to the preset balance end threshold.
8. A battery equalization management apparatus, comprising:
the parameter acquisition module is used for acquiring the SOC value and the voltage value of each battery monomer in the battery pack;
the judging module is used for determining whether the battery pack meets a preset balance condition according to the SOC value of each battery monomer;
the state determination module is used for determining the current state of the battery pack according to the SOC value of each battery monomer if the battery pack meets a preset balance condition;
the balance control variable determining module is used for selecting the SOC value or the voltage value of the single battery as a balance control variable according to the current state of the battery pack;
and the balance management module is used for carrying out balance management on the battery pack according to the balance control variable.
9. A battery equalization management apparatus, comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the battery equalization management method of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a battery equalization management method according to any one of claims 1-7.
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| CN112561298B (en) * | 2020-12-09 | 2023-10-13 | 深圳市优必选科技股份有限公司 | Robot battery management method, apparatus, control device and storage medium |
| CN112757961A (en) * | 2020-12-23 | 2021-05-07 | 南京工程学院 | Lithium battery SOC estimation method, active equalization control method and system |
| CN112737049A (en) * | 2021-01-04 | 2021-04-30 | 珠海格力电器股份有限公司 | Battery equalization control method and device and battery module |
| CN113922464A (en) * | 2021-10-29 | 2022-01-11 | 蜂巢能源科技有限公司 | Balancing method and device for power battery system and electronic equipment |
| CN114899923A (en) * | 2022-06-22 | 2022-08-12 | 湘投云储科技有限公司 | Dynamic equalization system and method for battery pack in medium-high voltage energy storage system |
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| CN115799678A (en) * | 2022-12-19 | 2023-03-14 | 湖北工业大学 | Segmented balance fuzzy control method based on voltage SOC and temperature |
| CN116315187A (en) * | 2023-05-19 | 2023-06-23 | 杭州协能科技股份有限公司 | Battery equalization control method and system and electronic equipment |
| CN116315187B (en) * | 2023-05-19 | 2023-08-22 | 杭州协能科技股份有限公司 | Battery equalization control method and system and electronic equipment |
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