CN116599179A - Battery active equalization method for large-scale energy storage system - Google Patents
Battery active equalization method for large-scale energy storage system Download PDFInfo
- Publication number
- CN116599179A CN116599179A CN202310594198.XA CN202310594198A CN116599179A CN 116599179 A CN116599179 A CN 116599179A CN 202310594198 A CN202310594198 A CN 202310594198A CN 116599179 A CN116599179 A CN 116599179A
- Authority
- CN
- China
- Prior art keywords
- battery
- power electronic
- battery pack
- energy storage
- storage system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000004146 energy storage Methods 0.000 title claims abstract description 32
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- 238000012546 transfer Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- 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
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a battery active equalization method for a large-scale energy storage system, which utilizes a battery cell charge and discharge state selection circuit to select a battery cell position which needs to be charged or discharged in a bus type battery pack equalization framework, wherein the bus type battery pack equalization framework consists of a plurality of battery packs, a plurality of bidirectional DC-DC converters and bus batteries. The application combines the advantages of a chip scheme and a topology scheme, adopts the EMB1428 chip to select a certain cell in the battery pack for charging or discharging operation, and adopts the bus parallel type double-active-bridge converter to realize the energy transfer function between different battery packs, thereby enabling each battery in the system to be in an equilibrium state. The method combines the advantages of small volume, small occupied port number and strong expansibility with the topological structure scheme of the chip scheme, and can realize the balanced control of each battery in the large-scale lithium battery energy storage system by using a single MCU.
Description
Technical Field
The application relates to the field of batteries, in particular to a battery active equalization method for a large-scale energy storage system.
Background
The battery equalization has the meaning that the voltage deviation of the lithium ion battery cell or the battery pack is kept in an expected range by utilizing a power electronic technology, so that each single battery is ensured to keep the same state during normal use, and the occurrence of overcharge and overdischarge is avoided. Battery equalization is generally classified into active equalization and passive equalization.
As an important way to effectively solve the "last kilometer" problem of new energy development, battery energy storage systems have been widely used in new energy power generation systems of different scales. However, most of the current research focuses on how to stabilize the output port voltage and power of the new energy power generation section by the energy storage system, and the variability between each energy storage unit in the energy storage system is neglected after a long period of use. Since the electrolyte concentration of each battery is slightly different in the processing process, and the working temperature, the current magnitude and other environmental conditions are different in the use process, the direct current internal resistance, the polarization effect, the real-time State of Charge (SOC) and the battery capacity of each battery are directly different. After long periods of use, the partially worse cells limit the amount of capacity that the entire energy storage system can use. When the battery with poor state is in the high-level SOC state, the SOC value of the healthy battery only reaches 70%. The battery with poor state is overcharged after the charging is continued, the part is heated seriously, and even accidents such as fire and explosion are caused. Correspondingly, in the discharging process, if a battery in a certain sub-health state is completely discharged, other healthy batteries still have partial electric quantity, and the discharging is carried out through the peripheral circuit, the service life of the sub-health battery is shortened.
Currently, to solve the above-mentioned problems, there are generally two types of schemes, the first being passive equalization of energy dissipation through resistors. The scheme has the advantages of simple topological structure, lower cost and easy equalization speed meeting the equalization requirement of the small-capacity battery. However, when the battery capacity is large, the balance current is small, so that the balance speed requirement of the energy storage unit in the energy storage system is difficult to meet, and meanwhile, the heat effect generated in the process also has a certain influence on the structural design. The second type of scheme is to use a bidirectional converter to improve topology to achieve battery equalization. The scheme has flexible structure, and can set circuit parameters according to different battery capacities, thereby adjusting the equalization speed in the equalization process. However, the number of power electronic switching tubes to be controlled in the scheme is large, and the number of GPIO ports of a single MCU is difficult to meet the control requirement for a plurality of batteries in an energy storage system, so that the number of batteries in the balancing process is directly limited. At the same time, energy can only be transferred between adjacent cells in such a scheme, which directly results in slow equalization control. Therefore, the battery active equalization method for the large-scale energy storage system is provided.
Disclosure of Invention
The embodiment provides a battery active equalization method for a large-scale energy storage system, which is used for solving the problem that the battery of the large-scale energy storage system is difficult to perform rapid active equalization in the prior art.
According to one aspect of the present application, there is provided a battery active equalization method for a large-scale energy storage system, the method comprising the steps of:
selecting a battery cell position, and selecting the battery cell position which needs to be charged or discharged in a bus type battery pack balancing framework by using a battery cell charging and discharging state selection circuit;
and step two, performing charging or discharging, namely performing charging or discharging by utilizing the battery cell selected in the step one of the system integral connection topology control.
Further, the battery cell charge-discharge state selection circuit in the first step is composed of batteries BAT1-BAT7, power electronic switching tubes Ss0-Ss7 and power electronic switching tubes Sp1-Sp 4.
Further, only two adjacent power electronic switching tubes Ss0-Ss7 are turned on in the working process, and only two power electronic switching tubes Sp1-Sp4 are turned on in the working process.
Further, the bus type battery pack balancing architecture in the first step is composed of a plurality of groups of battery packs, a plurality of bidirectional DC-DC converters and a bus battery, wherein a plurality of groups of battery packs are stacked and connected, each battery pack is connected with the bidirectional DC-DC converter, the plurality of bidirectional DC-DC converters are connected with the bus battery, each battery pack is composed of a battery pack, an EMB1428 chip and a power electronic switch tube, and the battery pack is composed of seven electric cores.
Further, the operation of the cell charge-discharge state selection circuit in the first step is mainly implemented by means of an EMB1428 chip.
Further, the specific circuit of the battery cell charge-discharge state selection circuit in the first step is that the "+" terminal in the battery cell charge-discharge state selection circuit is connected with the "-" terminal of the battery pack of the higher voltage level, the "-" terminal is connected with the "+" terminal of the battery pack of the lower voltage level to form a stacked state, a higher voltage value is provided for the load, and meanwhile, the "+" terminal and the "-" terminal in the battery cell charge-discharge state selection circuit are both connected with the bidirectional DC-DC circuit port in the bus battery pack equalization architecture.
Further, the EMB1428 chip is connected with the MCU through an SPI communication port, and the MOSFET in the bidirectional DC-DC converter is connected with a GPIO port of the MCU through a MOSFET driving circuit.
Further, the plurality of battery packs are not interfered with each other, and control is realized for each battery cell in each battery pack.
Further, the control signal of the EMB1428 chip is directly connected with a power electronic switching tube, and the power electronic switching tube is positioned in a bidirectional DC-DC converter with each battery pack connected with a bus to control the energy flow direction and speed.
Further, the EMB1428 chip is classified into two modes of charge and discharge operation.
According to the embodiment of the application, the problem that batteries of a large-scale energy storage system are difficult to perform rapid active equalization is solved, the advantages of a chip scheme and a topology scheme are combined, an EMB1428 chip is adopted to select a certain battery core in a battery pack for charging or discharging operation, and meanwhile, a bus parallel type double-active-bridge converter is adopted to realize the energy transfer function between different battery packs, so that each battery in the system is in an equalization state, namely, the advantages of small volume, few occupied ports and strong expansibility of the topology scheme are combined, and each battery in the large-scale lithium battery energy storage system can be controlled by using a single MCU.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic overall flow diagram of an embodiment of the present application;
FIG. 2 is a schematic diagram of a cell charge/discharge state selection circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a bus type battery pack equalization architecture according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a dual active bridge circuit topology according to an embodiment of the present application;
fig. 5 is a schematic diagram of a bus-type active-bridge battery active equalization lithium battery SOC according to an embodiment of the present application.
Wherein the curves in fig. 5 are SOC1, SOC2, SOC4 and SOC3 in order from top to bottom.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application 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.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1-5, a battery active equalization method for a large-scale energy storage system, the method includes the following steps:
selecting a battery cell position, and selecting the battery cell position which needs to be charged or discharged in a bus type battery pack balancing framework by using a battery cell charging and discharging state selection circuit;
and step two, performing charging or discharging, namely performing charging or discharging by utilizing the battery cell selected in the step one of the system integral connection topology control.
When the battery pack is used, the advantages of a chip scheme and a topology scheme are combined, the EMB1428 chip is adopted to select a certain cell in the battery pack for charging or discharging operation, and meanwhile, the bus parallel type double-active-bridge converter is adopted to realize the energy transfer function between different battery packs, so that each battery in the system can be in an equilibrium state.
The battery cell charge and discharge state selection circuit in the first step consists of batteries BAT1-BAT7, power electronic switching tubes Ss0-Ss7 and power electronic switching tubes Sp1-Sp 4.
Only two adjacent power electronic switching tubes Ss0-s7 are conducted in the working process, and only two power electronic switching tubes Sp1-Sp4 are conducted in the working process.
The bus type battery pack balancing framework in the first step is composed of a plurality of groups of battery packs, a plurality of bidirectional DC-DC converters and a bus battery, wherein the plurality of groups of battery packs are connected, each battery pack is connected with the bidirectional DC-DC converter, the plurality of bidirectional DC-DC converters are connected with the bus battery, each battery pack is composed of a battery pack, an EMB1428 chip and a power electronic switch tube, and the battery pack is composed of seven electric cores. During operation, which cell is charged or discharged is controlled by the EMB1428 chip. For the different groups, which of each group needs to be charged or discharged is performed by the bidirectional DC-DC converter.
In the first step, the operation of the battery cell charge-discharge state selection circuit is mainly realized by virtue of an EMB1428 chip.
The specific circuit connection of the battery cell charge-discharge state selection circuit in the first step is that a "+" terminal in the battery cell charge-discharge state selection circuit is connected with a "-" terminal of a battery pack of a higher voltage level, and the "-" terminal is connected with a "+" terminal of the battery pack of a lower voltage level to form a stacked state, so that a higher voltage value is provided for a load. Meanwhile, the "+" terminal and the "-" terminal in the cell charge-discharge state selection circuit are connected with the bidirectional DC-DC circuit port in the bus type battery pack equalization architecture, that is, the content of each block on the left side in fig. 3 is the same as that shown in fig. 2. In the circuit connection process, the "+" terminal in fig. 2 is connected with the "-" terminal of the battery pack of the higher voltage level, the "-" terminal is connected with the "+" terminal of the battery pack of the lower voltage level to form a stacked state, a higher voltage value is provided for a load, meanwhile, the "+" terminal and the "-" terminal in fig. 2 are connected with the bidirectional DC-DC circuit ports in fig. 3, and the bidirectional DC-DC converter can control the energy flow direction and speed.
The EMB1428 chip is connected with the MCU through an SPI communication port, and a MOSFET in the bidirectional DC-DC converter is connected with a GPIO port of the MCU through a MOSFET driving circuit.
The battery packs are not interfered with each other, and control is realized for each battery cell in each battery pack.
The control signal of the EMB1428 chip is directly connected with a power electronic switch tube, the power electronic switch tube is positioned in a bidirectional DC-DC converter connected with the bus by each battery pack, the energy flow direction and speed are controlled, in the working process, which battery core in the same battery pack is specifically charged or discharged is controlled by the EMB1428 chip, and which battery core in different battery packs is specifically charged or discharged in each battery pack is executed by the bidirectional DC-DC converter.
The EMB1428 chip is divided into two working modes of charging and discharging, the working modes of the cell charging and discharging state selection circuit can be divided into two main classes according to the charging state and the discharging state, and each main class can be divided into eight states according to specific on or off of a certain power electronic switch tube.
When the application is used, the battery cell is mainly composed of two parts, wherein the first part is to select a battery cell position to be charged through the EMB1428, and the first part is realized by transmitting a corresponding SPI signal to the EMB1428 chip by the MCU; the second part is controlled by a bidirectional DC-DC circuit.
In the first part, the EMB1428 chip can be divided into two modes of operation, charge and discharge.
The working modes of the battery cell charge-discharge state selection circuit can be divided into two major categories according to the charge state and the discharge state, and each major category can be divided into eight states according to specific on-off of a certain power electronic switching tube, wherein the power electronic switching tubes Ss0-Ss7 are only conducted by two adjacent power electronic switching tubes in the working process, the power electronic switching tubes Sp1-Sp4 are only conducted by two power electronic switching tubes in the working process at the same time, and in the charging process, the switch gating states are shown in the following table, and the following table is a battery cell gating power electronic switching tube working mode table in the charging process.
| BAT | S s0 | S s1 | S s2 | S s3 | S s4 | S s5 | S s6 | S s7 | S p1 | S p2 | S p3 | S p4 |
| 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 |
| 3 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| 4 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 |
| 5 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 |
| 6 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 0 |
| 7 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
In the discharging process, the switch gating state is shown in the table, and the table below is a working mode table of the battery core gating power electronic switch tube in the discharging process.
Wherein "1" represents the power electronic switching tube being turned on and "0" represents the power electronic switching tube being turned off.
The charging state is divided into seven modes, respectively,
charging strobe mode 1: the power electronic switching tube Ss0, the power electronic switching tube Ss1, the power electronic switching tube Sp3 and the power electronic switching tube Sp4 are conducted;
charging strobe mode 2: the power electronic switching tube Ss1, the power electronic switching tube Ss2, the power electronic switching tube Sp1 and the power electronic switching tube Sp2 are turned on;
charging strobe mode 3: the power electronic switching tube Ss2, the power electronic switching tube Ss3, the power electronic switching tube Sp3 and the power electronic switching tube Sp4 are turned on;
charging strobe mode 4: the power electronic switching tube Ss3, the power electronic switching tube Ss4, the power electronic switching tube Sp1 and the power electronic switching tube Sp2 are turned on;
charging strobe mode 5: the power electronic switching tube Ss4, the power electronic switching tube Ss5, the power electronic switching tube Sp3 and the power electronic switching tube Sp4 are turned on;
charge gating mode 6: the power electronic switching tube Ss5, the power electronic switching tube Ss6, the power electronic switching tube Sp1 and the power electronic switching tube Sp2 are turned on;
charging strobe mode 7: the power electronic switching tube Ss6, the power electronic switching tube Ss7, the power electronic switching tube Sp3, and the power electronic switching tube Sp4 are turned on.
The discharge state is divided into seven modes, respectively,
discharge strobe mode 1: the power electronic switching tube Ss0, the power electronic switching tube Ss1, the power electronic switching tube Sp1, and the power electronic switching tube Sp2 are turned on.
Discharge gating pattern 2: the power electronic switching tube Ss1, the power electronic switching tube Ss2, the power electronic switching tube Sp3, and the power electronic switching tube Sp4 are turned on.
Discharge gating pattern 3: the power electronic switching tube Ss2, the power electronic switching tube Ss3, the power electronic switching tube Sp1, and the power electronic switching tube Sp2 are turned on.
Discharge gating pattern 4: the power electronic switching tube Ss3, the power electronic switching tube Ss4, the power electronic switching tube Sp3, and the power electronic switching tube Sp4 are turned on.
Discharge strobe mode 5: the power electronic switching tube Ss4, the power electronic switching tube Ss5, the power electronic switching tube Sp1, and the power electronic switching tube Sp2 are turned on.
Discharge gating pattern 6: the power electronic switching tube Ss5, the power electronic switching tube Ss6, the power electronic switching tube Sp3, and the power electronic switching tube Sp4 are turned on.
Discharge strobe mode 7: the power electronic switching tube Ss6, the power electronic switching tube Ss7, the power electronic switching tube Sp1, and the power electronic switching tube Sp2 are turned on.
In the second part, energy bidirectional flow is realized mainly through a bidirectional DC-DC converter, and in order to verify the feasibility of the scheme, a double-active bridge circuit is selected as a bidirectional DC-DC circuit for realizing energy movement in the scheme. The topology structure of the double-active bridge circuit is shown in fig. 4, and the topology is composed of a power electronic switch tube S1, a power electronic switch tube S2, a power electronic switch tube S3, a power electronic switch tube S4, a power electronic switch tube S5, a power electronic switch tube S6, a power electronic switch tube S7, a power electronic switch tube S8, an inductance L, a capacitance Cin, a capacitance Cout and a transformer T, wherein the double-active bridge converter generally adopts a phase shift control mode to realize energy transfer, and because of numerous research papers and patents of the double-active bridge at present, too many control strategies and algorithms related to the double-active bridge topology are not repeated herein.
The battery balance control module is built by adopting a double active bridge topology as a bidirectional DC-DC converter topology, one battery core is mounted on a bus for energy exchange, each seven battery cores are in a group, an EMB1428 chip in each group selects a battery core which is specifically charged or discharged, when energy needs to be transmitted between the groups, firstly, the battery core with a higher SOC transmits energy to the battery core mounted on the bus, and then the battery core mounted on the bus discharges the battery core with a lower SOC value in the group which needs to be charged, so that energy transfer between different groups is realized, and in the battery balance process, the SOC value change curves of the four battery cores are simulated in a Simulink environment, as shown in fig. 5.
Taking three groups of electric cores (total 21 electric cores) as an example, in the execution process, the electric cores can be divided into twenty-seven according to the working modes corresponding to the SOC values of the electric cores, and the following table is a large-scale energy storage system mode analysis and control strategy table.
/>
/>
The application has the advantages that:
the expandable battery active equalization circuit can effectively reduce the number requirement on the output control terminals of the main control chip. In the actual working process, only four serial data lines are needed to control the EMB1428 chip, so that the charging and discharging states of the corresponding seven batteries can be realized. Meanwhile, the control signal of the main control chip is directly connected with the power electronic switch tube in the bidirectional DCDC converter, wherein each battery pack is connected with the bus, so that the energy flow direction and speed can be controlled. For different states of the battery packs, each battery pack does not interfere with each other, and control can be realized for each battery cell in each battery pack. The expandable battery active equalization circuit has good application prospect in a renewable energy power generation system, and effectively solves the problem that large-scale lithium batteries are difficult to equalize. The application combines the advantages of small volume, small occupied port number and strong expansibility with the topological structure scheme, and can realize the balanced control of each battery in the large-scale lithium battery energy storage system by using a single MCU.
The circuit, the electronic components and the modules are all in the prior art, and can be completely realized by a person skilled in the art, and needless to say, the protection of the application does not relate to the improvement of software and a method.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A battery active equalization method for a large-scale energy storage system is characterized by comprising the following steps of: selecting a battery core position which needs to be charged or discharged in a bus type battery pack balancing framework by utilizing a battery core charging and discharging state selection circuit, wherein the bus type battery pack balancing framework consists of a plurality of battery packs, a bidirectional DC-DC converter and a bus battery;
the method comprises the following steps:
selecting a battery cell position, and selecting the battery cell position which needs to be charged or discharged in a bus type battery pack balancing framework by using a battery cell charging and discharging state selection circuit;
and step two, performing charging or discharging, namely performing charging or discharging by utilizing the battery cell selected in the step one of the system integral connection topology control.
2. The method for actively balancing batteries for a large-scale energy storage system according to claim 1, wherein the method comprises the steps of: the battery cell charge and discharge state selection circuit in the first step consists of batteries BAT1-BAT7, power electronic switching tubes Ss0-Ss7 and power electronic switching tubes Sp1-Sp 4.
3. The method for actively balancing batteries for a large-scale energy storage system according to claim 2, wherein the method comprises the steps of: only two adjacent power electronic switching tubes Ss0-Ss7 are conducted in the working process, and only two power electronic switching tubes Sp1-Sp4 are conducted in the working process.
4. The method for actively balancing batteries for a large-scale energy storage system according to claim 1, wherein the method comprises the steps of: the bus type battery pack balancing framework in the first step is composed of a plurality of groups of battery packs, a plurality of bidirectional DC-DC converters and bus batteries, wherein the battery packs are stacked and connected, each battery pack is connected with the bidirectional DC-DC converter, the bidirectional DC-DC converters are connected with the bus batteries, each battery pack is composed of a battery pack, an EMB1428 chip and a power electronic switch tube, and the battery pack is composed of seven electric cores.
5. The method for actively balancing batteries for a large-scale energy storage system according to claim 1, wherein the method comprises the steps of: in the first step, the operation of the battery cell charge-discharge state selection circuit is mainly realized by virtue of an EMB1428 chip.
6. The method for actively balancing batteries for a large-scale energy storage system according to claim 4, wherein the method comprises the steps of: the specific circuit of the battery cell charge-discharge state selection circuit in the first step is that a "+" terminal in the battery cell charge-discharge state selection circuit is connected with a "-" terminal of a battery pack of a higher voltage level, the "-" terminal is connected with a "+" terminal of a battery pack of a lower voltage level to form a stacked state, a higher voltage value is provided for a load, and meanwhile, the "+" terminal and the "-" terminal in the battery cell charge-discharge state selection circuit are connected with a bidirectional DC-DC circuit port in a bus battery pack equalization framework.
7. The method for actively balancing batteries for a large-scale energy storage system according to claim 4, wherein the method comprises the steps of: the EMB1428 chip is connected with the MCU through an SPI communication port, and a MOSFET in the bidirectional DC-DC converter is connected with a GPIO port of the MCU through a MOSFET driving circuit.
8. The method for actively balancing batteries for a large-scale energy storage system according to claim 4, wherein the method comprises the steps of: the plurality of battery packs are not interfered with each other, and control is realized for each battery cell in each battery pack.
9. The method for actively balancing batteries for a large-scale energy storage system according to claim 4, wherein the method comprises the steps of: the control signal of the EMB1428 chip is directly connected with a power electronic switching tube, and the power electronic switching tube is positioned in a bidirectional DC-DC converter of which each battery pack is connected with a bus to control the energy flow direction and speed.
10. The method for actively balancing batteries for a large-scale energy storage system according to claim 4, wherein the method comprises the steps of: the EMB1428 chip is classified into two modes of charge and discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310594198.XA CN116599179A (en) | 2023-05-24 | 2023-05-24 | Battery active equalization method for large-scale energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310594198.XA CN116599179A (en) | 2023-05-24 | 2023-05-24 | Battery active equalization method for large-scale energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116599179A true CN116599179A (en) | 2023-08-15 |
Family
ID=87600484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310594198.XA Pending CN116599179A (en) | 2023-05-24 | 2023-05-24 | Battery active equalization method for large-scale energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116599179A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118157286A (en) * | 2024-05-09 | 2024-06-07 | 湖南麦格米特电气技术有限公司 | Battery equalization system and electronic equipment |
-
2023
- 2023-05-24 CN CN202310594198.XA patent/CN116599179A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118157286A (en) * | 2024-05-09 | 2024-06-07 | 湖南麦格米特电气技术有限公司 | Battery equalization system and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10431996B2 (en) | Smart Battery, electric energy allocation bus system, battery charging and discharging method and electric energy allocation method | |
| KR101632694B1 (en) | Battery cell voltage balancing apparatus and method | |
| WO2012165771A2 (en) | System for storing power comprising modularized bms and method for controlling same | |
| CN106356927A (en) | Lithium battery pack SOC (state of charge) equalization system and lithium battery pack SOC equalization method | |
| CN103595092A (en) | Controllable current balancing system of electric vehicle battery packs | |
| CN112217243B (en) | Inter-module balancing method, device and equipment based on bidirectional active balancing | |
| CN114726033A (en) | Battery system charging and discharging control method based on dynamic reconfigurable battery network | |
| CN116599179A (en) | Battery active equalization method for large-scale energy storage system | |
| CN205509600U (en) | Novel double -deck balanced control of lithium cell group device | |
| CN108011425A (en) | A kind of active equalizer circuit of cell pack and method | |
| CN203674735U (en) | Controllable current balancing system for electric vehicle battery pack | |
| CN202111479U (en) | Management device for rechargeable batteries | |
| Wu et al. | A multi‐module equalization system for lithium‐ion battery packs | |
| JP2021506207A (en) | Communication system and method between BMS | |
| CN109193863A (en) | Battery voltage balance control method and circuit | |
| CN111740463A (en) | Modular battery equalization system and method | |
| CN208353021U (en) | A kind of dynamic balancing battery management system of intelligent photovoltaic low-speed electronic car owner | |
| CN105356560A (en) | Two-stage distributed battery pack active equalization control system and method thereof | |
| CN214957032U (en) | Chargeable distributed control battery system | |
| CN212366147U (en) | Lithium battery pack and modular lithium battery | |
| KR100815431B1 (en) | Uniform energy-backup device of battery cell for hybrid electric vehicle | |
| CN110729781B (en) | Lithium battery pack equalization control method taking charge quantity difference value as equalization criterion | |
| CN109274149B (en) | Electrical energy exchange device, battery device and battery maintenance system | |
| CN208797850U (en) | A kind of energy-storage system of reversible transducer composition | |
| Huang et al. | A reconfigurable battery supercapacitor hybrid energy system with active balancing for vehicle applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |