CN111509805A - Low-voltage parallel battery operation control system and method - Google Patents

Low-voltage parallel battery operation control system and method Download PDF

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Publication number
CN111509805A
CN111509805A CN202010348799.9A CN202010348799A CN111509805A CN 111509805 A CN111509805 A CN 111509805A CN 202010348799 A CN202010348799 A CN 202010348799A CN 111509805 A CN111509805 A CN 111509805A
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China
Prior art keywords
module
slave
master
voltage
abnormal
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Chinese (zh)
Inventor
刘改
张卓益
吴晗青
石亚磊
施昊菅
靖文祥
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Zhejiang Hengrui Technology Co ltd
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Zhejiang Hengrui Technology Co ltd
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Priority to CN202010348799.9A priority Critical patent/CN111509805A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • 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)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a low-voltage parallel battery operation control system and a method, wherein the method comprises the following steps: acquiring working state information of all battery modules; dividing the battery module into an abnormal module and a normal module according to the acquired working state information; cutting off the electrical connection between the abnormal module and the normal module; judging the balance information of the battery module according to the working state information, and carrying out balance adjustment on the battery module; the method and system according to the present invention can effectively prevent the abnormal state of the battery module from damaging the load and the BMS panel and improve the lifespan of the entire battery module.

Description

Low-voltage parallel battery operation control system and method
Technical Field
The invention relates to the field of battery control, in particular to a low-voltage parallel battery operation control system and method.
Background
The parallelly connected unusual state of part battery module that can appear of many module batteries, dangerous states such as under-voltage, excessive pressure, overflow, overtemperature, prior art scheme mainly cuts off the connection between unusual module and the load through the BMS system, when the pressure differential appears too big, carries out the equilibrium by the controller of load end and adjusts, and prior art scheme has following problem: when the battery module is abnormal, the connection between the battery module and the load is cut off, so that the overload phenomenon of part of the battery module occurs, and the service life of the battery is influenced; when battery module was in the state of stewing in addition, there was certain pressure differential between the different battery modules, when pressure differential was too big, the BMS system can be strikeed to the heavy current that produces to the life of components and parts in the influence BMS system.
Disclosure of Invention
One of the main objectives of the present invention is to provide a system and a method for controlling operation of low-voltage parallel batteries, wherein the system and the method distinguish abnormal states and normal states of all battery modules by obtaining abnormal data of undervoltage, overcurrent, overvoltage, overtemperature, etc. in all battery modules, and effectively isolate abnormal battery modules by disconnecting the battery modules in the abnormal states from other battery modules and loads, thereby reducing the influence of the abnormal battery modules on the entire battery system.
Another objective of the present invention is to provide a system and a method for controlling operation of low-voltage parallel batteries, wherein the system and the method obtain voltage and current of normal battery modules when the battery modules are in operation, determine a balance status of each normal battery module, and perform balance adjustment on the battery modules if the battery modules are unbalanced, so as to prolong the service life of the battery modules.
Another objective of the present invention is to provide a system and a method for controlling operation of low voltage parallel batteries, wherein the system and the method acquire a voltage difference between different battery modules when the battery modules are in a static state, the system sets a voltage difference threshold, and when the different battery modules exceed the set voltage difference threshold, the system increases a current limit to the different battery modules, so that damage of the BMS module caused by a large current impact can be effectively avoided.
Another object of the present invention is to provide a low voltage parallel battery operation control system and method, which can adjust the output power of each module in an unbalanced state and make the output power of the entire battery module meet the load requirement.
To achieve at least one of the above objects, the present invention further provides a method for controlling the operation of low-voltage parallel batteries, comprising the steps of:
acquiring working state information of all battery modules;
dividing the battery module into an abnormal module and a normal module according to the acquired working state information;
cutting off the electrical connection between the abnormal module and the normal module;
and judging the balance information of the battery module according to the working state information, and carrying out balance adjustment on the battery module.
According to a preferred embodiment of the present invention, a battery module allocation rule is preset, the battery module is divided into a master and a plurality of slaves, and the master receives the working state information of the slaves and performs the operations of cutting off, reconnecting or charging and discharging the slaves according to the working states of the slaves.
According to a preferred embodiment of the present invention, the host determines the balance information of the normal module, and performs balance adjustment on the normal module if the balance information is not balanced.
According to another preferred embodiment of the present invention, the operating state of the master is determined, and if the operating state of the master is determined as the abnormal module, the electrical connection between the master and all the battery modules and the load is cut off, and the master is redistributed from the remaining normal slaves.
According to another preferred embodiment of the present invention, the master determines the voltage of each slave, and if the slave has a low voltage, the master reduces the output power of the low voltage slave and increases the power of the master and/or other normal voltage slaves.
According to another preferred embodiment of the present invention, the master determines the operating status of each slave, and if the plurality of slaves are in an abnormal status, the master disconnects the electrical connection between each abnormal slave and other battery modules and loads.
According to another preferred embodiment of the present invention, a voltage difference threshold is preset, when the battery modules are in a static state, the voltage of each battery module is obtained, the voltage difference between the battery modules is determined, and if the obtained voltage difference is greater than the voltage difference threshold, the current flowing from the high voltage module to the low voltage module is limited.
According to another preferred embodiment of the present invention, the working status of the abnormal module is obtained, and if the working status of the abnormal module is recovered to normal, the abnormal module is reconnected to other battery modules and the load.
In order to achieve at least one of the above objects, the present invention further provides a low voltage parallel battery operation control system comprising:
a host;
at least one slave machine;
a BMS module;
the BMS module is connected with the master machine and the slave machines, the BMS module receives the working state information of each battery module, the master machine receives the working state information of the plurality of slave machines, and the master machine performs cutting-off, reconnection and charging and discharging operations on the slave machines according to the working state information of the slave machines.
According to a preferred embodiment of the present invention, the low voltage parallel battery operation control system further comprises a power supply module for supplying power to the master, the slaves and the BMS module.
According to a preferred embodiment of the invention, the system comprises an alarm module, the alarm module is communicated with the module system, and the alarm module receives the abnormal state information and transmits the abnormal state information to the system for visual display.
Drawings
FIG. 1 is a schematic flow chart showing a method for controlling the operation of low-voltage parallel batteries according to the present invention;
FIG. 2 is a schematic block diagram of a low voltage parallel battery operation control system according to the present invention;
FIG. 3 is a schematic view showing a normal state current flow;
fig. 4 is a schematic diagram showing a current flow in an abnormal state of the method for controlling the operation of the low-voltage parallel battery according to the present invention, wherein the first slave is an abnormal module, and a circuit breaking point is at a position a;
fig. 5 is a schematic diagram showing the flow of current during charging in a static state according to the operation control method for low-voltage parallel batteries.
The system comprises a master-10, a slave-20, a first slave-21, a second slave 22, a third slave-23 and a BMS module-30.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The underlying principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Please refer to fig. 2, which shows a module connection diagram of the low-voltage parallel battery operation control system according to the present invention. The system comprises: a host 10; at least one slave 20; the BMS module 30, wherein the BMS module 30 is connected to the master 10 and the slave, and is configured to obtain the operating status information of each master 10 and each slave 20 in real time, the master 10 receives the operating status of each slave 20, and performs operations such as disconnection, reconnection, charging and discharging, and the like on the slave 20 according to the operating status of the slave 20, and it should be noted that the operating status includes: the master machine 10 and the slave machine 30 are preset according to the characteristics of each battery module, for example, the master machine 10 can be set to have a large output power, and the master machine 10 receives the working state information of the slave machine and performs operations such as cutting, reconnection, charging and discharging according to the working state of the slave machine. The system further includes a power supply module, which is a battery and supplies power to the battery module, the BMS module 30, the master unit 10, and the slave unit 20.
It should be noted that, the BMS module 30 itself is integrated with, but not limited to, current, voltage and temperature sensors, and can directly acquire parameters of each battery module in the system, such as voltage, current and temperature, and the manner of acquiring the parameters in the present invention is the prior art, and the details thereof are not repeated herein.
It should be noted that, because the battery module has the above abnormal state due to aging, working environment and other factors during the operation, the battery module in the abnormal state is cut off, for example, please refer to the schematic diagram of fig. 3, the drawing includes a master 10, a first slave 21, a second slave 22 and a third slave 23, the master 10, the first slave 21, the second slave 22 and the third slave 23 are connected in parallel and connected to a load end, the master 10 receives the working state information of each slave, and in the normal state, the master 10 and the slave 20 respectively output corresponding power to the load to maintain the normal operation of the load. If the abnormal state occurs in the first slave 21, the first slave 21 sends the abnormal state signal to the host 10, the host 10 performs a disconnection or adjustment balancing operation according to the abnormal state information of the first slave 21, specifically, the system is provided with an abnormal data threshold, such as an under-voltage threshold, an over-temperature threshold, an over-voltage threshold, and an over-current threshold, when at least one item of data in the acquired abnormal state information exceeds the abnormal data threshold, the system determines the first slave 21 as an abnormal module, and further issues a disconnection instruction through the system to disconnect the connection between the first slave 21 and other battery modules and the load, at this time, the first slave 21 is effectively isolated as an abnormal module, so that the abnormal module is prevented from damaging the BMS system and the load.
It should be noted that the BMS module 30 receives the real-time status data of the first slave 21 in real time, when the real-time status data of the first slave 21 is restored to the normal status, the system restores the first slave 21 to the original connection status, for example, if the abnormal data is over-temperature data, the system automatically cuts off and isolates the first slave 21, when the first slave 21 is not in the working status, the temperature is naturally cooled, the temperature data acquired by the BMS module 30 in real time is less than a preset over-temperature threshold, and the system reconnects the first slave 21. It should be noted that, in other possible implementation solutions, the master 10 determines that the plurality of slaves are in an abnormal state, and the system cuts off the electrical connection between each slave and the master 10 and between the slaves and the load, so that each abnormal module is isolated independently, and the abnormal modules are prevented from affecting each other.
Further, the BMS module 30 obtains the operating state information of the master 10, if at least one item of the operating state information of the master 10 exceeds an abnormal data threshold, it determines that the master 10 is an abnormal module, the system issues a disconnection command to cut off electrical connections between the master 10 and other slaves and loads, so as to effectively isolate the master 10, and the system redistributes the master 10 among the remaining normal slaves according to a preset distribution rule, wherein the preset distribution rule may be selected according to the operating performance of each slave, for example, the distribution rule is set according to the magnitude of rated output power, and the redistributed master 10 obtains the operating state information of each sub-rack for balanced scheduling.
Further, referring to fig. 3, in this embodiment, the master 10 receives voltage data of each slave, and determines whether each slave is in a normal state, if the master 10 and the slave are in the normal state, it is further determined whether output powers of the master 10 and the slave are balanced, and if the output powers of the master 10 and the slave are not balanced, the master 10 performs output balancing scheduling on the slave, so that output balancing is implemented on one hand, and the service life of the battery module is prolonged on the other hand. Specifically, the method comprises the following steps: the system judges whether output is balanced or not, if the output is unbalanced, the host 10 acquires voltage data of each slave, and if the voltage of the first slave 21 is smaller than that of the other slaves, the host 10 controls the first slave 21 to reduce the output power and increase the output power of the other slaves so as to ensure the stability of the output power. If the voltage of the first slave 21 is greater than that of the other slaves, the master 10 controls the first slave 21 to increase the output power and simultaneously decrease the output power of the other slaves. In other possible embodiments of the present invention, if unbalanced conditions of higher voltage or lower voltage occur in multiple slaves, the master 10 may simultaneously regulate and control the output power of multiple slaves to be reduced or increased, and simultaneously regulate and control the output power of other slaves, so as to keep the total output power of the load balanced.
It should be noted that when each battery module is in a static state, a certain voltage difference occurs between different battery modules, and since the different battery modules are connected in parallel, a static current exists between the battery modules having the voltage difference, and if the voltage difference between the battery modules is too large, a large current that impacts the circuit of the BMS module 30 is generated, based on which the present invention further provides a method for limiting the static current, please refer to fig. 5, which includes the following steps:
acquiring voltage of the battery module in a standing state;
calculating the voltage difference between the battery modules;
presetting a differential pressure threshold, comparing the calculated differential pressure with the differential pressure threshold, and if the differential pressure threshold is larger than the differential pressure threshold, limiting the current between the battery modules exceeding the differential pressure threshold by the system;
and if the voltage difference is smaller than the voltage difference threshold value, the system removes the current limitation.
For example:
setting the first slave 21 to the lowest voltage V1The voltages of the second slave 22 and the third slave 23 are respectively V2And V3The voltage of the host 10 is V4Setting the total pressure difference of the first slave 21 as Vs, setting the pressure difference threshold as Vx, and calculating V by the system1And V2、V3、V4The total pressure difference between, i.e.: vs ═ V2+V3+V4)-V1If the total pressure difference Vs is greater than the pressure difference threshold Vx, it indicates that the charging operation is performed on the first slave 21 at the second slave 22, the third slave 23, and the master 10, and current flows into the first slave 21 from the second slave, the third slave, and the fourth slave, respectively, so that a large current exists in the input/output line connected to the first slave 21, and the system limits the current on the first input/output line.
Further, if the voltage V of the second slave 222Is greater than the voltage V of the first slave 211And is less than the voltages of the other slaves and the master 10, the system calculates the voltage difference between the voltage of the second slave 22 and the voltage difference between the other battery modules, and sets the voltage difference of the second slave 22 to be Vs1The differential pressure threshold is Vx, Vs1＝(V3+V4)-V1-V2If Vs1When the voltage is greater than Vx, the current on the input and output line of the second slave machine 22 is excessive, and the system limits the voltage of the output and output line of the second slave machine 22.
In the above exemplary scheme, the third slave 23 and the master 10 continuously charge the first slave 21 and the second slave 22, so that the voltage difference between the first slave 21, the second slave 22, the third slave 23 and the fourth slave gradually decreases when Vs and Vs are applied1When the voltage difference is smaller than the voltage difference threshold Vx, the current limitation of the first slave 21 and the current limitation of the second slave 22 are respectively released by the system, so that the stability of current transmission of the battery module in the standing state can be realized.
It should be noted that, in another preferred embodiment of the present invention, the system further includes an alarm module, and the alarm module performs an alarm according to each abnormal state information acquired by the system, and sends the alarm information to the system for visual display.
In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium. The computer program, when executed by a Central Processing Unit (CPU), performs the above-described functions defined in the method of the present application. It should be noted that the computer readable medium mentioned above in the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In this application, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It will be understood by those skilled in the art that the embodiments of the present invention described above and illustrated in the drawings are given by way of example only and not by way of limitation, the objects of the invention having been fully and effectively achieved, the functional and structural principles of the present invention having been shown and described in the embodiments, and that various changes or modifications may be made in the embodiments of the present invention without departing from such principles.

Claims (10)

1. A low-voltage parallel battery operation control method is characterized by comprising the following steps:
acquiring working state information of all battery modules;
dividing the battery module into an abnormal module and a normal module according to the acquired working state information;
cutting off the electrical connection between the abnormal module and the normal module;
and judging the balance information of the battery module according to the working state information, and carrying out balance adjustment on the battery module.
2. The method for controlling the operation of the low-voltage parallel batteries according to claim 1, wherein a battery module allocation rule is preset, the battery module is divided into a master machine and a plurality of slave machines, the master machine receives working state information of the slave machines and performs cutting, reconnection or charging and discharging operations on the slave machines according to working states of the slave machines, the master machine judges normal module balancing information, and if the balance is not balanced, the normal module is subjected to balancing adjustment.
3. The method as claimed in claim 2, wherein the operating state of the master is determined, and if the operating state of the master is determined as an abnormal module, the electrical connection between the master and all the battery modules and the load is cut off, and the master is redistributed from the remaining normal slaves.
4. The method as claimed in claim 2, wherein the master determines the voltage of each slave, and if the slave has a low voltage, the master reduces the output power of the slave and increases the power of the master and/or other slaves with normal voltage.
5. The operation control method of low-voltage parallel batteries according to claim 2, wherein the master machine judges the working state of each slave machine, and if the plurality of slave machines are in abnormal state, the electrical connection between each abnormal slave machine and other battery modules and loads is cut off.
6. The method according to claim 1, wherein a voltage difference threshold is preset, when the battery modules are in a static state, the voltage of each battery module is obtained, the voltage difference between the battery modules is determined, and if the obtained voltage difference is greater than the voltage difference threshold, the current flowing from the high-voltage module to the low-voltage module is limited.
7. The method as claimed in claim 1, wherein the operation state of the abnormal module is obtained, and if the operation state of the abnormal module is recovered to normal, the abnormal module is reconnected to other battery modules and the load.
8. A low voltage parallel battery operation control system, comprising:
a host;
at least one slave machine;
a BMS module;
the BMS module is connected with the master machine and the slave machines, the BMS module receives the working state information of each battery module, the master machine receives the working state information of the plurality of slave machines, and the master machine performs cutting-off, reconnection and charging and discharging operations on the slave machines according to the working state information of the slave machines.
9. The system of claim 8, further comprising a power module for supplying power to the master, the slave and the BMS module.
10. The system according to claim 8, wherein the system comprises an alarm module, the alarm module communicates with the module system, and the alarm module receives the abnormal state information and transmits the abnormal state information to the system for visual display.
CN202010348799.9A 2020-04-28 2020-04-28 Low-voltage parallel battery operation control system and method Pending CN111509805A (en)

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