CN112026587A - Control method and device for battery equalization system and storage medium - Google Patents
Control method and device for battery equalization system and storage medium Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/14—Preventing excessive discharging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/15—Preventing overcharging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention provides a control method, a device and a storage medium for a battery equalization system, wherein the method comprises the following steps: acquiring the charge state of each single battery in a battery pack and the average charge state of each single battery in the battery pack; and determining whether to perform current-limiting balance control or active balance control according to the charge state of each single battery and the average charge state of each single battery in the battery pack. The scheme provided by the invention can avoid the damage of the battery caused by over-discharge or over-charge, and realize the energy transfer among the single batteries.
Description
Technical Field
The invention relates to the field of batteries, in particular to a battery equalization system control method, a battery equalization system control device and a storage medium.
Background
A Battery Management System (BMS) is a key component of the new energy electric vehicle, the SOC state of a battery is estimated by monitoring the information of the voltage and the current of the battery, the electric quantity distribution of the electric vehicle is coordinated and controlled, the service life of the battery is effectively prolonged, and the safe operation of the battery system in a reliable environment is guaranteed. With the continuous use of batteries, the difference between different single batteries is increased continuously, and the balance management is to realize the consistency of the energy states of the single batteries by controlling battery parameters such as voltage, current, SOC (state of charge) and the like.
Currently available equalization methods include passive equalization and active equalization. Passive equalization is usually dissipated thermally through equalization resistors, which result in large energy losses; active equalization generally transfers a cell with high energy to a cell with low energy, so as to realize energy transfer, and the way can reduce energy loss and heating phenomena. The active equalization method mainly adopted at the present stage is generally used for judging the balance state of the battery according to the voltage value or the SOC value of the battery, and although the voltage equalization method is simple, the capacity of the single battery cannot be completely guaranteed to reach a consistent state; the SOC control method needs to acquire parameters such as voltage, current and temperature, although the battery system tends to a balanced state, certain errors still exist, and if acquired parameter data are inaccurate, the SOC estimation time is long due to error accumulation, and the self-balancing efficiency of the battery is influenced.
Disclosure of Invention
The present invention is to overcome the above-mentioned drawbacks of the prior art, and provide a battery equalization management method, device and storage medium, so as to solve the problem of implementing consistency of energy states of single batteries in the prior art.
The invention provides a battery equalization system control method on one hand, which is characterized by comprising the following steps: acquiring the charge state of each single battery in a battery pack and the average charge state of each single battery in the battery pack; and determining whether to perform current-limiting balance control or active balance control according to the charge state of each single battery and the average charge state of each single battery in the battery pack.
Optionally, determining whether to perform current-limiting equalization control or active equalization control according to the state of charge of each cell and the average state of charge of each cell in the battery pack includes: when the absolute value of the difference value between the charge state of any single battery in the battery pack and the average charge state is greater than or equal to a first preset threshold value, carrying out current-limiting balance control on the single batteries; and when the mean square error between the charge state of each single battery in the battery pack and the average charge state is greater than or equal to a second preset threshold value, performing active equalization control on the battery pack.
Optionally, performing current-limiting equalization control on the single battery includes: if the state of charge of the single battery is smaller than the average state of charge, limiting the discharge of the single battery; and if the charge state of the single battery is larger than the average charge state, limiting the charging of the single battery.
Optionally, performing active equalization control of the battery pack includes: discharging the single batteries of which the charge states are larger than a third preset threshold value in the battery pack; and charging the single battery with the state of charge smaller than a fourth preset threshold value in the battery pack.
In another aspect, the present invention provides a control device for a battery equalization system, including: the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the charge state of each single battery in a battery pack and the average charge state of each single battery in the battery pack; and the control unit is used for determining whether to perform current-limiting balance control or active balance control according to the charge state of each single battery and the average charge state of each single battery in the battery pack.
Optionally, the determining, by the control unit, whether to perform current-limiting equalization control or active equalization control according to the state of charge of each cell and the average state of charge of each cell in the battery pack includes: when the absolute value of the difference value between the charge state of any single battery in the battery pack and the average charge state is greater than or equal to a first preset threshold value, carrying out current-limiting balance control on the single batteries; and when the mean square error between the charge state of each single battery in the battery pack and the average charge state is greater than or equal to a second preset threshold value, performing active equalization control on the battery pack.
Optionally, the controlling unit performs current-limiting equalization control on the single battery, and includes: if the state of charge of the single battery is smaller than the average state of charge, limiting the discharge of the single battery; and if the charge state of the single battery is larger than the average charge state, limiting the charging of the single battery.
Optionally, the control unit performs active equalization control on the battery pack, and includes: discharging the single batteries of which the charge states are larger than a third preset threshold value in the battery pack; and charging the single battery with the state of charge smaller than a fourth preset threshold value in the battery pack.
A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
According to the technical scheme of the invention, current-limiting balance control or active balance control is carried out according to the charge state of each single battery and the average charge state of each single battery in the battery pack, and when the absolute value of the difference value between the SOC of each single battery and the average SOC of the battery pack is greater than or equal to a first preset threshold value, the current-limiting balance control is started to avoid the damage of the battery caused by over-discharge or over-charge; and when the SOC mean square error of the battery pack is greater than or equal to a second preset threshold value, starting active equalization control to realize energy transfer among the single batteries so as to realize the consistency of the energy states of the single batteries.
The active equalization and the current-limiting equalization are combined, so that the energy equalization is quickly achieved, the charging and discharging current can be controlled, the excessive charging and discharging of the battery are avoided, the secondary transfer of energy in the charging and discharging process is avoided, and the energy loss is reduced. The switch matrix driver is controlled to drive the switch matrix to select a target single battery to be connected with the transformer, so that bidirectional energy transfer can be realized, secondary transfer of energy of the battery in the charging and discharging process can be avoided, a battery system can quickly reach a balanced state, and efficient energy transfer is realized; the efficiency of the battery system for realizing self balance is effectively improved, energy is enabled to be efficiently transferred between any single battery and the battery pack, and the service life of the battery is effectively prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic method diagram of an embodiment of a method for controlling a battery balancing system according to the present invention;
fig. 2 is a schematic structural diagram of a battery equalization system according to an embodiment of the present invention;
FIG. 3 is a block diagram of a balancing management module according to an embodiment of the present invention;
fig. 4 is a block diagram of a battery balancing system control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The battery equalization system according to an embodiment of the present invention may include: the battery balancing management system comprises a main control module, a balancing management module, a battery information acquisition module and a display module. Fig. 2 is a schematic structural diagram of a battery equalization system according to an embodiment of the present invention. As shown in fig. 2, the battery information acquisition module is mainly responsible for detecting and acquiring current and voltage signals of the battery. The equalization management module includes a plurality of equalization units. Each equalizing unit comprises a plurality of single batteries, a switch matrix module and a transformer. Fig. 3 is a schematic structural diagram of a balance management module according to an embodiment of the present invention. As shown in fig. 3, the balancing management module is composed of M balancing units, the portion of the dashed frame in the figure is the balancing unit, and each balancing unit includes n single batteries, a switch matrix module and a transformer. The switch matrix module is composed of a switch matrix driver and a plurality of MOSFET switch tubes, and the switch tubes share one transformer. And the balance management module drives the switch matrix to select the target single battery to be connected with the transformer through the switch matrix driver. The interface in the display module can display the charge allowance, the battery acquisition information and the battery balance information.
Fig. 1 is a schematic method diagram of an embodiment of a method for controlling a battery balancing system according to the present invention. The method of the present invention may be implemented, for example, in the master control module of the battery balancing system shown in fig. 2.
As shown in fig. 1, according to an embodiment of the present invention, the control method includes at least step S110 and step S120.
Step S110, the charge state of each single battery in the battery pack and the average charge state of each single battery are obtained.
Specifically, voltage and current information of each single battery is collected, and the state of charge of each single battery is calculated. For example, as shown in fig. 2, the voltage and current information of each single battery can be collected by the battery information collecting module. The state of charge SOC is defined as the ratio of the remaining capacity of the battery to the rated total capacity of the battery, and the SOC is defined as follows: the ratio of the residual capacity of the battery to the rated capacity under the same condition under the specified discharge rate is as follows:
SOC＝CO/CE
wherein, CO is the residual capacity of the battery, and CE is the rated total capacity of the battery.
And step S120, determining whether to perform current-limiting balance control or active balance control according to the charge state of each single battery and the average charge state of each single battery in the battery pack.
And when the absolute value of the difference value between the charge state of any single battery in the battery pack and the average charge state is greater than or equal to a first preset threshold value, carrying out current-limiting balance control on the single battery. That is, the absolute value of the difference between the state of charge and the average state of charge of the battery pack is greater than or equal to a first preset threshold β1The single battery of (2) performs current limiting control. First preset threshold beta1Depending on the requirement of the equalization strategy on the control accuracy, for example, the requirement may be between 0.15 and 0.2.
When the absolute value of the difference between the SOC value of the single battery and the average SOC value of the battery pack meets the condition that the absolute value of the difference is | delta SOC | ≧ beta1When the battery pack is charged, the SOC value of the single battery deviates from the average SOC value of the battery pack, and the fact that the charge amount of the single battery obviously deviates from the charge amount of the whole battery is shown. For example, the main control module sends an instruction to the balancing module to start current-limiting balancing control, and limits the charging and discharging of the single battery with the absolute value of the difference between the charge state and the average charge state being greater than or equal to a first preset threshold.
Specifically, the absolute value of the difference between the state of charge and the average state of charge of the battery pack is greater than or equal to a first preset threshold value beta1The single battery carries out current limiting control, and the method comprises the following steps: and if the charge state of the single battery is smaller than the average charge state, limiting the discharge of the single battery, and if the charge state of the single battery is larger than the average charge state, limiting the charge of the single battery. The single battery deviating from the average SOC value of the battery pack is limited to discharge in the discharging state, and the SOC value of the single battery with smaller SOC (the SOC is smaller than the average SOC value of the battery pack) and the average SOC value of the battery packThe difference value of the SOC value is large, so that the damage caused by over-discharge can be avoided by limiting the discharge of the SOC value; the single batteries deviating from the average SOC value of the battery pack are limited to be charged in the charging state, and the single batteries with larger SOC (the SOC value is larger than the average SOC value of the battery pack) have larger difference value with the average SOC value of the battery pack, so that the damage caused by overcharge can be avoided by limiting the charging of the single batteries.
When the mean square error between the charge state of each single battery in the battery pack and the average charge state is greater than or equal to a second preset threshold value beta2And performing active equalization control on the battery pack.
The state of charge SOC mean square error b of the battery pack can be calculated according to the following formula:
in the formula (I), the compound is shown in the specification,
representing the average value of the charge of the battery, SOCiRepresents the charge amount of any one of the unit cells, and n represents the number of the unit cells. The mean square deviation b characterizes the inconsistency of the charge amount of the battery. Second predetermined threshold value beta2I.e., the threshold condition for turning on active equalization. Beta is a2The requirement of the balancing strategy on the control precision is determined. And calculating according to the current capacity, the charge-discharge state, the number of the single batteries and other actual conditions of the batteries by combining the mean square error.
Specifically, performing active equalization control of the battery pack includes: discharging the single batteries of which the charge states are larger than a third preset threshold value in the battery pack; and charging the single battery with the state of charge smaller than a fourth preset threshold value in the battery pack.
For example, the main control module sends out a PWM signal through the switch matrix driver to control the switch matrix, selects a target cell to connect with the transformer, drives the MOSFET switch tube to turn on and off, discharges a battery with higher energy, and simultaneously charges a battery with lower energy until the battery system is in a self-balancing state. Specifically, when there is a balancing requirement, the switch matrix driver is controlled to send out a PWM signal to sequentially turn on corresponding MOSFET switch tubes in the switch matrix, and the battery cells to be charged and discharged are connected to the primary side of the transformer (where the transformer plays a role in storing energy and serves as an intermediary for energy transfer). Energy transfer between the single batteries and the module batteries is realized by switching on and off the MOSFET switching tubes in the driving switch matrix, so that the purposes of discharging the batteries with high energy (the charge state is greater than a third preset threshold) and charging the batteries with low energy (the charge state is less than a fourth preset threshold) are achieved, and the balance is finished until the energy of each battery of the battery pack reaches a consistent state.
According to the embodiment of the invention, the combined action of the current-limiting balance and the active balance enables the battery system to quickly reach the energy balance, and simultaneously can control the magnitude of the charging and discharging current, thereby avoiding secondary transfer of energy in the charging and discharging process and reducing the energy loss. The switch matrix driver drives the switch matrix to select the target single battery to be connected with the transformer, and therefore bidirectional energy transfer can be achieved. The battery equalization system that this patent provided can effectively improve the efficiency that battery system realized the self-balancing, makes the energy realize high-efficient energy transfer between any battery cell and battery module, has prolonged the life of battery simultaneously.
Fig. 4 is a block diagram of a battery balancing system control apparatus according to an embodiment of the present invention. The method of the present invention may be implemented, for example, in the master control module of the battery balancing system shown in fig. 2.
As shown in fig. 4, the battery balancing system control apparatus 100 includes an acquisition unit 110 and a control unit 120.
The obtaining unit 110 is configured to obtain a state of charge of each unit cell in the battery pack and an average state of charge of each unit cell in the battery pack.
Specifically, voltage and current information of each single battery is collected, and the state of charge of each single battery is calculated. For example, as shown in fig. 2, the voltage and current information of each single battery can be collected by the battery information collecting module. The state of charge SOC is defined as the ratio of the remaining capacity of the battery to the rated total capacity of the battery, and the SOC is defined as follows: the ratio of the residual capacity of the battery to the rated capacity under the same condition under the specified discharge rate is as follows:
SOC＝CO/CE
wherein, CO is the residual capacity of the battery, and CE is the rated total capacity of the battery.
The control unit 120 is configured to determine whether to perform current-limiting equalization control or active equalization control according to the charge state of each cell and the average charge state of each cell in the battery pack.
When the absolute value of the difference between the state of charge of any single battery in the battery pack and the average state of charge is greater than or equal to a first preset threshold, the control unit 120 performs current-limiting equalization control on the single battery. That is, the absolute value of the difference between the state of charge and the average state of charge of the battery pack is greater than or equal to a first preset threshold β1The single battery of (2) performs current limiting control. First preset threshold beta1Depending on the requirement of the equalization strategy on the control accuracy, for example, the requirement may be between 0.15 and 0.2.
When the absolute value of the difference between the SOC value of the single battery and the average SOC value of the battery pack meets the condition that the absolute value of the difference is | delta SOC | ≧ beta1When the battery pack is charged, the SOC value of the single battery deviates from the average SOC value of the battery pack, and the fact that the charge amount of the single battery obviously deviates from the charge amount of the whole battery is shown. For example, the main control module sends an instruction to the balancing module to start current-limiting balancing control, and limits the charging and discharging of the single battery with the absolute value of the difference between the charge state and the average charge state being greater than or equal to a first preset threshold.
Specifically, the absolute value of the difference between the state of charge and the average state of charge of the battery pack of the control unit 120 is greater than or equal to a first preset threshold β1The single battery carries out current limiting control, and the method comprises the following steps: and if the charge state of the single battery is smaller than the average charge state, limiting the discharge of the single battery, and if the charge state of the single battery is larger than the average charge state, limiting the charge of the single battery. The single battery deviating from the average SOC value of the battery pack is limited to discharge in the discharging state, and the SOC is smaller (The SOC value of the single battery is smaller than the average SOC value of the battery pack), the difference between the SOC value and the average SOC value of the battery pack is large, and the damage caused by over-discharge can be avoided by limiting the discharge; the single batteries deviating from the average SOC value of the battery pack are limited to be charged in the charging state, and the single batteries with larger SOC (the SOC value is larger than the average SOC value of the battery pack) have larger difference value with the average SOC value of the battery pack, so that the damage caused by overcharge can be avoided by limiting the charging of the single batteries.
When the mean square error between the charge state of each single battery in the battery pack and the average charge state is greater than or equal to a second preset threshold value beta2The control unit 120 performs active equalization control of the battery pack.
The state of charge SOC mean square error b of the battery pack can be calculated according to the following formula:
in the formula (I), the compound is shown in the specification,
representing the average value of the charge of the battery, SOCiRepresents the charge amount of any one of the unit cells, and n represents the number of the unit cells. The mean square deviation b characterizes the inconsistency of the charge amount of the battery. Second predetermined threshold value beta2I.e., the threshold condition for turning on active equalization. Beta is a2The requirement of the balancing strategy on the control precision is determined. And calculating according to the current capacity, the charge-discharge state, the number of the single batteries and other actual conditions of the batteries by combining the mean square error.
Specifically, the control unit 120 performs active equalization control of the battery pack, including: discharging the single batteries of which the charge states are larger than a third preset threshold value in the battery pack; and charging the single battery with the state of charge smaller than a fourth preset threshold value in the battery pack.
For example, a switch matrix driver sends out a PWM signal to control a switch matrix, a target single battery is selected to be connected with a transformer, the MOSFET switch tube is driven to be switched on and off, the battery with higher energy is discharged, and meanwhile, the battery with lower energy can be charged until a self-balancing state of a battery system is achieved. Specifically, when there is a balancing requirement, the switch matrix driver is controlled to send out a PWM signal to sequentially turn on corresponding MOSFET switch tubes in the switch matrix, and the battery cells to be charged and discharged are connected to the primary side of the transformer (where the transformer plays a role in storing energy and serves as an intermediary for energy transfer). Energy transfer between the single batteries and the module batteries is realized by switching on and off the MOSFET switching tubes in the driving switch matrix, so that the purposes of discharging the batteries with high energy (the charge state is greater than a third preset threshold) and charging the batteries with low energy (the charge state is less than a fourth preset threshold) are achieved, and the balance is finished until the energy of each battery of the battery pack reaches a consistent state.
The invention also provides a storage medium corresponding to the battery equalization system control method, and a computer program is stored on the storage medium, and when the program is executed by a processor, the program realizes the steps of any one of the methods.
According to the scheme provided by the invention, current-limiting balance control or active balance control is carried out according to the charge state of each single battery and the average charge state of each single battery in the battery pack, and when the absolute value of the difference value between the SOC of each single battery and the average SOC of the battery pack is greater than or equal to a first preset threshold value, the current-limiting balance control is started to avoid the damage of the battery caused by over-discharge or over-charge; and when the SOC mean square error of the battery pack is greater than or equal to a second preset threshold value, starting active equalization control to realize energy transfer among the single batteries.
The active equalization and the current-limiting equalization are combined, so that the energy equalization is quickly achieved, the charging and discharging current can be controlled, the excessive charging and discharging of the battery are avoided, the secondary transfer of energy in the charging and discharging process is avoided, and the energy loss is reduced. The switch matrix driver is controlled to drive the switch matrix to select a target single battery to be connected with the transformer, so that bidirectional energy transfer can be realized, secondary transfer of energy of the battery in the charging and discharging process can be avoided, a battery system can quickly reach a balanced state, and efficient energy transfer is realized; the efficiency of the battery system for realizing self balance is effectively improved, energy is enabled to be efficiently transferred between any single battery and the battery pack, and the service life of the battery is effectively prolonged.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. A battery equalization system control method, comprising:
acquiring the charge state of each single battery in a battery pack and the average charge state of each single battery in the battery pack;
and determining whether to perform current-limiting balance control or active balance control according to the charge state of each single battery and the average charge state of each single battery in the battery pack.
2. The method of claim 1, wherein determining whether to perform current limiting equalization control or active equalization control according to the state of charge of each cell and the average state of charge of each cell in the battery pack comprises:
when the absolute value of the difference value between the charge state of any single battery in the battery pack and the average charge state is greater than or equal to a first preset threshold value, carrying out current-limiting balance control on the single batteries;
and when the mean square error between the charge state of each single battery in the battery pack and the average charge state is greater than or equal to a second preset threshold value, performing active equalization control on the battery pack.
3. The method of claim 2, wherein the current-limiting equalization control of the single battery comprises:
if the state of charge of the single battery is smaller than the average state of charge, limiting the discharge of the single battery;
and if the charge state of the single battery is larger than the average charge state, limiting the charging of the single battery.
4. The method of claim 2 or 3, wherein performing active equalization control of the battery pack comprises:
discharging the single batteries of which the charge states are larger than a third preset threshold value in the battery pack;
and charging the single battery with the state of charge smaller than a fourth preset threshold value in the battery pack.
5. A battery equalization system control apparatus, comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the charge state of each single battery in a battery pack and the average charge state of each single battery in the battery pack;
and the control unit is used for determining whether to perform current-limiting balance control or active balance control according to the charge state of each single battery and the average charge state of each single battery in the battery pack.
6. The apparatus according to claim 5, wherein the control unit determines whether to perform the current-limiting balancing control or the active balancing control according to the state of charge of each cell and the average state of charge of each cell in the battery pack, and comprises:
when the absolute value of the difference value between the charge state of any single battery in the battery pack and the average charge state is greater than or equal to a first preset threshold value, carrying out current-limiting balance control on the single batteries;
and when the mean square error between the charge state of each single battery in the battery pack and the average charge state is greater than or equal to a second preset threshold value, performing active equalization control on the battery pack.
7. The apparatus of claim 6, wherein the control unit performs current-limiting equalization control on the single batteries, and comprises:
if the state of charge of the single battery is smaller than the average state of charge, limiting the discharge of the single battery;
and if the charge state of the single battery is larger than the average charge state, limiting the charging of the single battery.
8. The apparatus according to claim 6 or 7, wherein the control unit performs active equalization control of the battery pack, including:
discharging the single batteries of which the charge states are larger than a third preset threshold value in the battery pack;
and charging the single battery with the state of charge smaller than a fourth preset threshold value in the battery pack.
9. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688386A (en) * | 2020-12-16 | 2021-04-20 | 珠海格力电器股份有限公司 | Balance control method, device, equipment, storage medium and power supply system |
| 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 |
| CN114362288A (en) * | 2021-12-08 | 2022-04-15 | 深圳市科陆电子科技股份有限公司 | Battery inter-cluster balance adjusting method and system and storage medium |
| CN115469238A (en) * | 2021-06-10 | 2022-12-13 | 中国科学院沈阳自动化研究所 | Battery pack balancing method based on joint state of charge estimation |
| WO2024001181A1 (en) * | 2022-07-01 | 2024-01-04 | 中国华能集团清洁能源技术研究院有限公司 | Battery cluster balancing system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148518A (en) * | 2011-03-18 | 2011-08-10 | 清华大学深圳研究生院 | Secondary battery pack charging and discharging dynamic feedback equalizing device and method |
| US20160099587A1 (en) * | 2014-10-02 | 2016-04-07 | Robert Bosch Gmbh | Method for cell balancing for a plurality of battery cells, and battery system for performing such a method |
| CN105633487A (en) * | 2016-01-13 | 2016-06-01 | 河南理工大学 | Intelligent management system of lithium ion battery |
| CN106356927A (en) * | 2016-09-19 | 2017-01-25 | 华中科技大学 | Lithium battery pack SOC (state of charge) equalization system and lithium battery pack SOC equalization method |
| CN110401247A (en) * | 2019-08-07 | 2019-11-01 | 贾明钋 | A kind of active equalization of battery method |
| CN111245067A (en) * | 2020-03-20 | 2020-06-05 | 中国葛洲坝集团电力有限责任公司 | Lithium battery pack energy balancing device and balancing method |
-
2020
- 2020-08-06 CN CN202010782834.8A patent/CN112026587A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148518A (en) * | 2011-03-18 | 2011-08-10 | 清华大学深圳研究生院 | Secondary battery pack charging and discharging dynamic feedback equalizing device and method |
| US20160099587A1 (en) * | 2014-10-02 | 2016-04-07 | Robert Bosch Gmbh | Method for cell balancing for a plurality of battery cells, and battery system for performing such a method |
| CN105633487A (en) * | 2016-01-13 | 2016-06-01 | 河南理工大学 | Intelligent management system of lithium ion battery |
| CN106356927A (en) * | 2016-09-19 | 2017-01-25 | 华中科技大学 | Lithium battery pack SOC (state of charge) equalization system and lithium battery pack SOC equalization method |
| CN110401247A (en) * | 2019-08-07 | 2019-11-01 | 贾明钋 | A kind of active equalization of battery method |
| CN111245067A (en) * | 2020-03-20 | 2020-06-05 | 中国葛洲坝集团电力有限责任公司 | Lithium battery pack energy balancing device and balancing method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688386A (en) * | 2020-12-16 | 2021-04-20 | 珠海格力电器股份有限公司 | Balance control method, device, equipment, storage medium and power supply system |
| CN115469238A (en) * | 2021-06-10 | 2022-12-13 | 中国科学院沈阳自动化研究所 | Battery pack balancing method based on joint state of charge estimation |
| 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 |
| CN114362288A (en) * | 2021-12-08 | 2022-04-15 | 深圳市科陆电子科技股份有限公司 | Battery inter-cluster balance adjusting method and system and storage medium |
| CN114362288B (en) * | 2021-12-08 | 2024-02-23 | 深圳市科陆电子科技股份有限公司 | Method, system and storage medium for regulating balance among battery clusters |
| WO2024001181A1 (en) * | 2022-07-01 | 2024-01-04 | 中国华能集团清洁能源技术研究院有限公司 | Battery cluster balancing system |
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