CN114156992A - Battery two-stage equalization method, device, equipment and storage medium - Google Patents

Battery two-stage equalization method, device, equipment and storage medium Download PDF

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CN114156992A
CN114156992A CN202111512361.0A CN202111512361A CN114156992A CN 114156992 A CN114156992 A CN 114156992A CN 202111512361 A CN202111512361 A CN 202111512361A CN 114156992 A CN114156992 A CN 114156992A
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battery
soc
equalized
balanced
difference value
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Inventor
廖力
陈珩
张瑾
胡玄同
李宏光
綦艺博
吴铁洲
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Hubei University of Technology
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Hubei University of Technology
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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
    • 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 invention relates to a battery two-stage equalization method, a device, equipment and a storage medium, wherein the method comprises the following steps: acquiring SOC values of all single batteries of a single battery pack; determining batteries to be equalized according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack; calculating the average SOC difference value of the battery to be equalized and all the single batteries of the same battery group and the SOC difference value of the battery to be equalized; according to the average SOC difference value of the battery to be balanced and all the single batteries of the same battery group; and calculating the SOC difference value of the battery to be balanced, carrying out in-group balancing and updating the SOC value of the balanced single battery. According to the battery two-stage equalization method, the device, the equipment and the storage medium, the equalization battery is determined according to the maximum value and the minimum value of the battery SOC, equalization is carried out according to the average SOC difference value and the SOC difference value of the battery to be equalized, the equalization speed is high, and the energy utilization rate is high.

Description

Battery two-stage equalization method, device, equipment and storage medium
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a battery two-stage equalization method, device, equipment and storage medium.
Background
With the rapid development of new energy electric vehicles, how to solve the safety problem of new energy electric vehicles becomes a new topic and difficulty in the automobile industry. Because the voltage of a single battery can not meet the use requirement of an electric automobile, a plurality of batteries are generally connected in series to form a battery pack in the use process, but the number of lithium ion batteries connected in series is large, and the lithium ion batteries are generally grouped. Due to factors such as internal resistance change, unequal capacity, aging and environmental temperature change of each battery, inconsistency of the battery pack is caused, and certain influence is caused on the performance and the service life of the battery pack. In order to reduce the effect of the inconsistency, the battery packs need to be equalized.
The currently common equalization methods include a maximum value method, a mean difference method and a model prediction method.
The traditional maximum value method and the average value difference method can easily realize battery pack equalization, but the equalization efficiency is not high. The model prediction method can quickly realize the equalization of the battery pack, but depends on a mathematical model, and the difficulty of establishing an accurate mathematical model for the battery is large due to the inconsistent difference of the capacity and the internal resistance of each single battery in the battery pack.
Disclosure of Invention
In view of the above, it is desirable to provide a battery two-stage equalization method, apparatus, device and storage medium, so as to solve the problem of low battery equalization efficiency in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a battery two-stage equalization method, including:
acquiring SOC values of all single batteries of a single battery pack;
determining batteries to be equalized according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack;
calculating the average SOC difference value of the battery to be equalized and all the single batteries of the same battery group; calculating the SOC difference value of the battery to be balanced;
and carrying out intra-group balancing and updating the SOC values of the balanced single batteries according to the average SOC difference values of the battery to be balanced and all the single batteries of the same group of batteries and the SOC difference values of the battery to be balanced.
Preferably, the determining the battery to be equalized according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack includes:
and when the difference value between the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack is larger than the preset in-pack balancing threshold value, the single batteries corresponding to the maximum value and the minimum value of the current SOC in the single battery pack are the batteries to be balanced.
Preferably, the average SOC difference value of the battery to be equalized and all the single batteries of the same battery group is calculated; and calculating the SOC difference value of the battery to be equalized, comprising the following steps:
calculating the average SOC of the single batteries of the single battery pack and the average SOC of the batteries to be balanced;
calculating the average SOC difference values of the battery to be equalized and all the single batteries of the same battery group according to the average SOC of the single batteries of the battery group and the average SOC of the battery to be equalized; and calculating the SOC difference value of the battery to be equalized.
Preferably, the method further comprises:
acquiring SOC values of a plurality of battery packs;
determining a battery pack to be equalized according to the maximum value and the minimum value of the current SOC in the plurality of battery packs;
calculating the average SOC difference value of the battery pack to be equalized and other battery packs; calculating the SOC difference value of the battery pack to be equalized;
and carrying out inter-group balancing and updating the SOC value of the battery pack after balancing according to the average SOC difference value between the battery pack to be balanced and other battery packs and the SOC difference value of the battery pack to be balanced.
Preferably, determining the battery pack to be equalized according to the maximum value and the minimum value of the current SOC in the plurality of battery packs includes:
and when the difference value between the maximum value and the minimum value of the current SOC in the battery packs is larger than a preset inter-pack balance threshold value, the battery packs corresponding to the maximum value and the minimum value of the current SOC in the battery packs are battery packs to be balanced.
Preferably, the average SOC difference value between the battery pack to be equalized and other battery packs is calculated; and calculating the SOC difference value of the battery pack to be equalized, comprising the following steps:
calculating the average SOC of all the battery packs and the average SOC of the battery packs to be equalized;
calculating the average SOC difference value between the battery pack to be equalized and other battery packs according to the average SOC of all the battery packs and the average SOC of the battery pack to be equalized; and calculating the SOC difference value of the battery pack to be equalized.
Preferably, the equalization between groups or the equalization between groups includes:
reasoning is carried out according to the fuzzy rule table and the membership function, and defuzzification is carried out through a defuzzifier to obtain balanced current;
and comparing the output current of the battery with the balance current to obtain a control signal, and controlling the battery to balance.
In a second aspect, the present invention further provides a battery two-stage equalizing apparatus, including:
the acquisition module is used for acquiring SOC values of all single batteries of the single battery pack;
the judging module is used for determining the battery to be balanced according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack;
the calculation module is used for calculating the average SOC difference value of the battery to be equalized and all the single batteries of the same battery group; calculating the SOC difference value of the battery to be balanced;
and the balancing module is used for carrying out in-pack balancing and updating the SOC values of the balanced single batteries according to the average SOC difference values of the battery to be balanced and all the single batteries of the same battery pack and the SOC difference values of the battery to be balanced.
In a third aspect, the present invention also provides an electronic device comprising a memory and a processor, wherein,
a memory for storing a program;
and the processor is coupled with the memory and used for executing the program stored in the memory so as to realize the steps in the battery two-stage equalization method in any one of the implementation modes.
In a fourth aspect, the present invention further provides a computer-readable storage medium, configured to store a computer-readable program or instruction, where the program or instruction, when executed by a processor, can implement the steps in the battery two-stage equalization method in any one of the above-mentioned implementation manners.
The beneficial effects of adopting the above embodiment are: according to the battery two-stage equalization method, the device, the equipment and the storage medium, the maximum SOC and the minimum SOC are found out by obtaining the SOC of the battery, whether the difference value needs to be equalized or not is judged, if the difference value exceeds the preset threshold value, the battery to be equalized is judged, the average SOC difference value of the battery and the SOC difference value of the battery to be equalized are calculated, and the battery is equalized.
Drawings
Fig. 1 is a schematic flow chart illustrating an embodiment of intra-group balancing in a battery two-stage balancing method according to the present invention;
fig. 2 is a schematic flow chart of inter-group balancing in the battery two-stage balancing method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a two-stage battery equalization apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery two-stage equalization electronic device according to an embodiment of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention provides a battery two-stage equalization method, a device, equipment and a storage medium, which are respectively explained below.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of intra-group equalization in a battery two-stage equalization method provided in the present invention, and an embodiment of the present invention discloses a battery two-stage equalization method, including:
s101, acquiring SOC values of all single batteries of a single battery pack;
s102, determining a battery to be balanced according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack;
s103, calculating average SOC difference values of the battery to be equalized and all single batteries of the same battery group; calculating the SOC difference value of the battery to be balanced;
and S104, carrying out intra-group balancing and updating the SOC values of the balanced single batteries according to the average SOC difference values of the battery to be balanced and all the single batteries of the same group of batteries and the SOC difference values of the battery to be balanced.
In step S101, the vehicle battery is usually a battery pack formed by a plurality of batteries, the plurality of battery packs are used to supply power to the vehicle, and when the battery is balanced, the battery is first subjected to intra-pack balancing, and the SOC values of all the single batteries in the battery pack are collected.
In step S102, according to the obtained SOCs of all the single batteries in the single battery pack, whether equalization is needed is determined by a difference between a maximum value and a minimum value of the SOCs, and if equalization is needed, the battery corresponding to the maximum value and the minimum value of the SOCs is an equalization battery.
In step S103, the present invention realizes balancing according to the average SOC difference value of the battery and the SOC difference value of the battery to be balanced, calculates the average SOC difference value according to the SOCs of all the batteries of the single battery pack, and calculates the SOC difference value of the battery to be balanced according to the SOC of the battery to be balanced.
In step S104, the battery to be equalized is equalized according to the average SOC difference value between the battery to be equalized and all the single batteries of the same battery group and the SOC difference value of the battery to be equalized, the SOC values of all the single batteries in the single battery group are updated after the equalization is completed, and whether all the single batteries in the single battery group need to be equalized or not is repeatedly judged until all the single batteries in the whole battery group do not need to be equalized. It can be understood that the in-pack balancing of the battery is a repeated process, and the SOC value of the single battery needs to be repeatedly acquired, the balancing needs to be repeatedly determined, and the SOC value of the single battery is updated after the balancing is completed.
In the above embodiment, the SOC values of the single batteries of the multiple groups of battery packs are collected, whether the single batteries in the single battery pack need to be balanced is judged, if the single batteries in the single battery pack need to be balanced, the average SOC difference value between the battery to be balanced and all the single batteries in the same group and the SOC difference value of the battery to be balanced are calculated, the equalization is performed, the SOCs of all the single batteries are updated after the equalization is finished, whether the current single battery needs to be balanced is repeatedly judged, and the equalization in the battery pack is finished until all the single batteries do not meet the equalization condition.
Compared with the prior art, the battery two-stage equalization method, the device, the equipment and the storage medium provided by the embodiment find out the maximum SOC and the minimum SOC by obtaining the SOC of the battery, judge whether the difference value needs to be equalized, calculate the average SOC difference value of the battery and the SOC difference value of the battery to be equalized for the battery to be equalized if the difference value exceeds the preset threshold value, and equalize the battery.
In some embodiments of the present invention, determining a battery to be equalized according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack includes:
and when the difference value between the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack is larger than the preset in-pack balancing threshold value, the single batteries corresponding to the maximum value and the minimum value of the current SOC in the single battery pack are the batteries to be balanced.
In the above embodiment, the intra-group equalization threshold Δ SOC is presetsetBAnd if the difference value of the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack is greater than the preset in-pack balancing threshold value, balancing the two batteries, and defining the battery to be balanced as the battery to be balanced.
In some embodiments of the present invention, the average SOC difference value between the battery to be equalized and all the single batteries of the same battery set is calculated; and calculating the SOC difference value of the battery to be equalized, comprising the following steps:
calculating the average SOC of the single batteries of the single battery pack and the average SOC of the batteries to be balanced;
calculating the average SOC difference values of the battery to be equalized and all the single batteries of the same battery group according to the average SOC of the single batteries of the battery group and the average SOC of the battery to be equalized; and calculating the SOC difference value of the battery to be equalized.
In the above embodiment, the average SOC of the single cells of the single battery pack and the average SOC of the cells to be equalized are calculated by the following formula:
Figure BDA0003397212920000071
Figure BDA0003397212920000072
wherein n is the number of single batteries in a single battery pack, SOCmaxBIs the maximum SOC, SOC of the current single battery in the groupminBIs the minimum SOC of the current cell in the pack,
Figure BDA0003397212920000073
is the average SOC of the unit cells of the single battery pack,
Figure BDA0003397212920000074
is the average SOC of the cells to be equalized.
Calculating the average SOC difference value SOC of all the single batteries of the battery to be balanced and the same battery setdifBAnd the SOC difference value delta SOC of the battery to be equalizedBThe formula is as follows:
Figure BDA0003397212920000075
ΔSOCB＝|SOCmaxB-SOCminB|。
referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of inter-group balancing in a battery two-stage balancing method according to the present invention, in some embodiments of the present invention, the method further includes:
s201, acquiring SOC values of a plurality of battery packs;
s202, determining a battery pack to be equalized according to the maximum value and the minimum value of the current SOC in the plurality of battery packs;
s203, calculating the average SOC difference value between the battery pack to be equalized and other battery packs; calculating the SOC difference value of the battery pack to be equalized;
and S204, balancing between the groups and updating the SOC value of the battery pack after balancing according to the average SOC difference value between the battery pack to be balanced and other battery packs and the SOC difference value of the battery pack to be balanced.
In step S201, SOC values of a plurality of battery packs are acquired for a battery pack composed of a plurality of single batteries as a whole, and the plurality of battery packs are equalized by the SOC values of the plurality of battery packs.
In step S202, after the SOC values of all the battery packs are obtained, whether inter-pack balancing is required or not and the battery packs to be balanced are determined according to the SOC values of all the battery packs, the difference between the maximum value and the minimum value of the SOC in the battery packs, and the preset pack balancing threshold.
In step S203, the battery pack is balanced according to the average SOC difference value between the battery pack to be balanced and other battery packs and the SOC difference value of the battery pack to be balanced, and after it is determined that the battery pack needs to be balanced, the average SOC difference value between the battery pack to be balanced and other battery packs and the SOC difference value of the battery pack to be balanced are further calculated according to the collected SOCs of all the battery packs.
In step S204, the battery pack to be equalized is equalized according to the average SOC difference value between the battery pack to be equalized and the other battery packs and the SOC difference value of the battery pack to be equalized, the SOC values of all the battery packs are updated after equalization is completed, and whether equalization is to be performed on all the battery packs is repeatedly determined until all the battery packs do not satisfy the equalization condition. It can be understood that the inter-group balancing of the battery packs is a repeated process, and needs to repeatedly acquire the SOC values of the battery packs, repeatedly determine whether the battery packs need to be balanced, and repeatedly update the SOC values of all the battery packs after the balancing is completed.
In the above embodiment, the SOC values of all the battery packs are first obtained, then whether inter-pack balancing needs to be performed is judged according to the SOC values of all the battery packs, if inter-pack balancing needs to be performed, an average SOC difference value between the battery pack to be balanced and other battery packs and an SOC difference value of the battery pack to be balanced are calculated, inter-pack balancing is performed, the SOC values of the battery packs need to be updated after the inter-pack balancing is completed, and whether all the current battery packs still need to be balanced is repeatedly judged until all the battery packs do not meet a balancing condition, and the inter-battery-pack balancing is completed.
In some embodiments of the present invention, determining a battery pack to be equalized according to a maximum value and a minimum value of a current SOC in a plurality of battery packs includes:
and when the difference value between the maximum value and the minimum value of the current SOC in the battery packs is larger than a preset inter-pack balance threshold value, the battery packs corresponding to the maximum value and the minimum value of the current SOC in the battery packs are battery packs to be balanced.
In the above embodiment, the interclass equalization threshold Δ SOC is presetsetPThe SOC value is 1%, the difference value between the maximum value and the minimum value of the current SOC in the battery packs is calculated and is compared with a preset inter-pack balance threshold value to judge whether inter-pack balance is needed or not, if the difference value is larger than the preset inter-pack balance threshold value, the two battery packs need to be balanced, and the difference value and the preset inter-pack balance threshold value are definedIs a battery pack to be equalized.
In some embodiments of the present invention, an average SOC difference value between the battery pack to be equalized and the other battery packs is calculated; and calculating the SOC difference value of the battery pack to be equalized, comprising the following steps:
calculating the average SOC of all the battery packs and the average SOC of the battery packs to be equalized;
calculating the average SOC difference value between the battery pack to be equalized and other battery packs according to the average SOC of all the battery packs and the average SOC of the battery pack to be equalized; and calculating the SOC difference value of the battery pack to be equalized.
In the above embodiment, the average SOC of all battery packs and the average SOC of the battery packs to be equalized are calculated by the following formula:
Figure BDA0003397212920000101
Figure BDA0003397212920000102
wherein n is the number of battery packs, SOCmaxPIs the maximum SOC, SOC of the current battery packminPIs the minimum SOC of the current battery pack,
Figure BDA0003397212920000103
is an average SOC of the battery pack,
Figure BDA0003397212920000104
is the average SOC of the two battery packs to be equalized.
Calculating the average SOC difference value SOC between the battery pack to be equalized and other battery packsdifPAnd the SOC difference value delta SOC of the battery pack to be equalizedPThe formula is as follows:
Figure BDA0003397212920000105
ΔSOCP＝|SOCmaxP-SOCminP|。
in some embodiments of the invention, performing intra-group equalization or inter-group equalization comprises:
reasoning is carried out according to the fuzzy rule table and the membership function, and defuzzification is carried out through a defuzzifier to obtain balanced current;
and comparing the output current of the battery with the balance current to obtain a control signal, and controlling the battery to balance.
In the above embodiment, when performing intra-group balancing, the average SOC difference values SOC of all the single batteries of the battery to be balanced and the battery in the same group are determineddifBAnd the SOC difference value delta SOC of the battery to be equalizedBSending the average SOC difference value SOC of the battery pack to be balanced and other battery packs to a fuzzy logic controller when carrying out the inter-pack balancedifPAnd the SOC difference value delta SOC of the battery pack to be equalizedPAnd sending the output current to a fuzzy logic controller, comparing the output current with the output current, outputting a PWM (pulse-width modulation) wave to control the switch of the MOSFET (metal-oxide-semiconductor field effect transistor), and driving an equalizing circuit in the group to work.
It should be noted that the fuzzy logic controller performs inference according to the fuzzy rule table and the membership function, and performs defuzzification through the defuzzifier to obtain the balance current. And comparing the balanced current with the output current to generate a PWM control signal of the MOSFET tube, and controlling the switching of the switching tube to realize the group internal balance.
In order to better implement the two-stage battery equalization method in the embodiment of the present invention, on the basis of the two-stage battery equalization method, please refer to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of the two-stage battery equalization device provided in the present invention, and an embodiment of the present invention provides a two-stage battery equalization device 300, including:
an obtaining module 301, configured to obtain SOC values of all single batteries of a single battery pack;
the judging module 302 is configured to determine a battery to be equalized according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack;
the calculating module 303 is configured to calculate average SOC difference values between the battery to be equalized and all the single batteries of the same battery set; calculating the SOC difference value of the battery to be balanced;
the equalizing module 304 is configured to perform intra-group equalization and update the SOC values of the equalized battery cells according to the average SOC difference values of the battery cells to be equalized and all the battery cells in the same group and the SOC difference values of the battery cells to be equalized.
Here, it should be noted that: the apparatus 300 provided in the foregoing embodiments may implement the technical solutions described in the foregoing method embodiments, and the specific implementation principles of the modules or units may refer to the corresponding contents in the foregoing method embodiments, which are not described herein again.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a battery two-stage balancing electronic device according to an embodiment of the present invention. Based on the above two-stage battery equalization method, the invention also provides a two-stage battery equalization device, which can be a mobile terminal, a desktop computer, a notebook computer, a palm computer, a server and other computing devices. The battery two-stage equalization apparatus includes a processor 410, a memory 420, and a display 430. Fig. 4 shows only some of the components of the electronic device, but it is to be understood that not all of the shown components are required to be implemented, and that more or fewer components may be implemented instead.
The memory 420 may be an internal storage unit of the battery two-stage equalization device in some embodiments, such as a hard disk or a memory of the battery two-stage equalization device. The memory 420 may also be an external storage device of the battery two-stage equalization device in other embodiments, such as a plug-in hard disk provided on the battery two-stage equalization device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and so on. Further, the memory 420 may also include both internal and external memory units of the battery two-stage equalization device. The memory 420 is used for storing application software installed in the battery two-stage equalization apparatus and various data, such as program codes installed in the battery two-stage equalization apparatus. The memory 420 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the memory 420 stores a battery two-level equalization program 440, and the battery two-level equalization program 440 can be executed by the processor 410, so as to implement the battery two-level equalization method according to the embodiments of the present application.
Processor 410, which in some embodiments may be a Central Processing Unit (CPU), microprocessor or other data Processing chip, executes program code stored in memory 420 or processes data, such as performing a battery two-level equalization method.
The display 430 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. Display 430 is used to display information at the battery two-stage equalization device and to display a visual user interface. The components 410 and 430 of the battery two-stage equalization device communicate with each other via a system bus.
In one embodiment, the steps in the battery two-level equalization method described above are implemented when processor 410 executes battery two-level equalization program 440 in memory 420.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims (10)

1. A battery two-stage equalization method is characterized by comprising the following steps:
acquiring SOC values of all single batteries of a single battery pack;
determining batteries to be equalized according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack;
calculating the average SOC difference value of the battery to be equalized and all the single batteries of the same battery group; calculating the SOC difference value of the battery to be balanced;
and carrying out in-pack balancing and updating the SOC values of the balanced single batteries according to the average SOC difference values of the battery to be balanced and all the single batteries of the same battery group and the SOC difference values of the battery to be balanced.
2. The two-stage battery equalization method according to claim 1, wherein the determining of the battery to be equalized according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack comprises:
and when the difference value between the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack is larger than a preset in-pack balance threshold value, the single batteries corresponding to the maximum value and the minimum value of the current SOC in the single battery pack are batteries to be balanced.
3. The battery two-stage equalization method according to claim 1, wherein the average SOC difference value between the battery to be equalized and all the single batteries of the same battery set is calculated; and calculating the SOC difference value of the battery to be equalized, comprising the following steps:
calculating the average SOC of the single batteries of the single battery pack and the average SOC of the batteries to be balanced;
calculating the average SOC difference values of the battery to be equalized and all the single batteries of the same battery group according to the average SOC of the single batteries of the battery group and the average SOC of the battery to be equalized; and calculating the SOC difference value of the battery to be equalized.
4. The battery two-stage equalization method according to claim 1, further comprising:
acquiring SOC values of a plurality of battery packs;
determining a battery pack to be equalized according to the maximum value and the minimum value of the current SOC in the plurality of battery packs;
calculating the average SOC difference value between the battery pack to be equalized and other battery packs; calculating the SOC difference value of the battery pack to be equalized;
and carrying out inter-group balancing and updating the SOC value of the battery pack after balancing according to the average SOC difference value between the battery pack to be balanced and other battery packs and the SOC difference value of the battery pack to be balanced.
5. The battery two-stage equalization method according to claim 4, wherein the determining the battery pack to be equalized according to the maximum value and the minimum value of the current SOC in the plurality of battery packs comprises the following steps:
and when the difference value between the maximum value and the minimum value of the current SOC in the battery packs is larger than a preset inter-pack balance threshold value, the battery packs corresponding to the maximum value and the minimum value of the current SOC in the battery packs are battery packs to be balanced.
6. The battery two-stage equalization method according to claim 4, characterized in that the average SOC difference value between the battery pack to be equalized and other battery packs is calculated; and calculating the SOC difference value of the battery pack to be equalized, comprising the following steps:
calculating the average SOC of all the battery packs and the average SOC of the battery packs to be equalized;
calculating the average SOC difference value between the battery pack to be equalized and other battery packs according to the average SOC of all the battery packs and the average SOC of the battery pack to be equalized; and calculating the SOC difference value of the battery pack to be equalized.
7. The two-stage battery equalization method according to claim 1 or 4, wherein the performing of the intra-group equalization or the inter-group equalization comprises:
reasoning is carried out according to the fuzzy rule table and the membership function, and defuzzification is carried out through a defuzzifier to obtain balanced current;
and comparing the output current of the battery with the balance current to obtain a control signal, and controlling the battery to balance.
8. A two-stage battery equalization apparatus, comprising:
the acquisition module is used for acquiring SOC values of all single batteries of the single battery pack;
the judging module is used for determining a battery to be balanced according to the maximum value and the minimum value of the current SOC of all the single batteries in the single battery pack;
the calculation module is used for calculating the average SOC difference value of the battery to be equalized and all the single batteries of the same battery group; calculating the SOC difference value of the battery to be balanced;
and the balancing module is used for carrying out in-group balancing and updating the SOC values of the balanced single batteries according to the average SOC difference values of the battery to be balanced and all the single batteries of the same group of batteries and the SOC difference values of the battery to be balanced.
9. An electronic device comprising a memory and a processor, wherein,
the memory is used for storing programs;
the processor, coupled to the memory, is configured to execute the program stored in the memory to implement the steps in the battery two-stage equalization method according to any one of claims 1 to 7.
10. A computer-readable storage medium for storing a computer-readable program or instructions, which when executed by a processor, is capable of implementing the steps of the battery two-stage equalization method according to any one of claims 1 to 7.
CN202111512361.0A 2021-12-07 2021-12-07 Battery two-stage equalization method, device, equipment and storage medium Pending CN114156992A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115360793A (en) * 2022-09-15 2022-11-18 湖北亿纬动力有限公司 Battery pack balancing method and device, battery system and storage medium
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115360793A (en) * 2022-09-15 2022-11-18 湖北亿纬动力有限公司 Battery pack balancing method and device, battery system and storage medium
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

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