CN110588434A - Energy storage system and battery management method and system thereof - Google Patents
Energy storage system and battery management method and system thereof Download PDFInfo
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- CN110588434A CN110588434A CN201910875699.9A CN201910875699A CN110588434A CN 110588434 A CN110588434 A CN 110588434A CN 201910875699 A CN201910875699 A CN 201910875699A CN 110588434 A CN110588434 A CN 110588434A
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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
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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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
- 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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- 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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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
According to the energy storage system and the battery management method and system thereof provided by the invention, each BMU uploads the acquired cell parameters to the corresponding CMU; then, the CMU judges whether the corresponding battery cluster has a fault according to the received battery core parameters and the collected battery cluster parameters; if the battery cluster runs normally, the corresponding CMU uploads the corresponding battery cluster characteristic data to the SMU through CAN communication; if the battery cluster fails, corresponding CMU uploads corresponding wave recording data to the SMU through Ethernet communication; compared with the prior art, the real-time interaction requirement satisfaction degree of high-capacity data in the energy storage system is improved.
Description
Technical Field
The invention relates to the technical field of energy storage management, in particular to an energy storage system and a battery management method and system thereof.
Background
With the increasingly wide application of electric automobiles, electrochemical energy storage is correspondingly developed in a large scale in an electric power system. For the typical application capacity of the current single MWh level, the battery in the energy storage system is usually composed of a plurality of parallel battery clusters, and each battery cluster includes a plurality of cells connected in series.
Because the BATTERY is relatively fragile in the system, and overcharge, overdischarge, large-current impact and the like all endanger the safety of the BATTERY, the energy storage system is usually configured with a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS for short) to realize real-time uploading of collected information of the voltage, current, temperature and the like of the BATTERY and timely issuing of control information of a plurality of switches in the BATTERY, thereby realizing reasonable control of charging and discharging of the BATTERY.
The information in the battery is divided into a parallel battery cluster level, a single battery cluster level and a battery core level, and the data capacity of the interactive information is huge due to the fact that the number of the battery clusters, particularly the number of the battery cores, is large. In the prior art, a battery management system is difficult to meet the real-time interaction requirement of high-capacity data in the face of information transmission work of battery multi-stage monitoring.
Disclosure of Invention
The invention provides an energy storage system and a battery management method and system thereof, and aims to solve the problem that the prior art cannot meet the real-time interaction requirement of high-capacity data.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
the invention provides a battery management method of an energy storage system, which is applied to the battery management system of the energy storage system, and the battery management method of the energy storage system comprises the following steps:
each BMU (Battery Management Unit) of the Battery Management system uploads the acquired cell parameters to a corresponding CMU (Battery control Management Unit) in the Battery Management system;
the CMU judges whether the corresponding battery cluster has a fault according to the received battery core parameters and the collected battery cluster parameters;
if the Battery cluster runs normally, the CMU uploads the corresponding Battery cluster characteristic data to an SMU (Battery System Management Unit) through CAN communication;
and if the battery cluster fails, the CMU uploads corresponding wave recording data to the SMU through Ethernet communication.
Optionally, after the CMU uploads the corresponding wave recording data to the SMU through ethernet communication, the method further includes:
and the external large-capacity storage unit of the SMU stores the wave recording data.
Optionally, after each battery management unit BMU of the battery management system uploads the acquired cell parameters to a corresponding battery cluster management unit CMU in the battery management system, the method further includes:
and when each CMU meets corresponding preset uploading conditions, uploading the received battery core parameters and the acquired battery cluster parameters to the SMU and/or the upper computer through Ethernet communication.
Optionally, after the CMU uploads the corresponding battery cluster feature data to the system battery management unit SMU through CAN communication, the method further includes:
and the SMU sends the running state parameters of each battery cluster to a controller of an energy storage inverter PCS in the energy storage system through CAN communication.
Optionally, before or after any step, the method further comprises:
and when the SMU receives a CMU software upgrading package sent by an upper computer through Ethernet communication, the SMU sends the CMU software upgrading package to each CMU through the Ethernet communication.
Optionally, the cell parameters include: the voltage, temperature and equilibrium state of each corresponding cell;
the battery cluster parameters include: the total voltage, the total current, the SOC (state of charge), the SOH (state of health), the on-off state of the positive and negative electrodes, and the fuse state of the positive and negative electrodes of the corresponding battery cluster.
Optionally, the recording data includes: and in a preset time period before and after the fault, the cell parameters received by the CMU and the collected battery cluster parameters.
Optionally, the battery cluster feature data includes: the battery cluster parameters, the voltage maximum value, the voltage minimum value, the temperature maximum value, the temperature minimum value and the balance state of all the internal battery cores of the corresponding battery cluster.
The second aspect of the present invention also provides a battery management system of an energy storage system, including: SMU, M CMUs and M multiplied by N BMUs, wherein M and N are positive integers; wherein:
each battery cluster of the energy storage system is respectively provided with a CMU and N BMUs which are in communication connection;
the SMU is arranged in a battery collecting cabinet BCP of the energy storage system and is connected with an external expansion large-capacity storage unit;
the SMU is in communication connection with each CMU through an Ethernet switch and is in serial communication connection with each CMU in sequence through CAN communication;
the SMU is in communication connection with an upper computer through Ethernet communication, and is in communication connection with a controller of a PCS (Power Management System) and an EMS (Energy Management System) in the Energy storage System through CAN communication and/or Ethernet communication;
the battery management system is used for executing the battery management method of the energy storage system.
Optionally, the CMU includes: the system comprises a processor, a communication module, a data real-time cache region and an acquisition module;
the processor is respectively connected with the acquisition module and the data real-time cache region;
the data real-time cache region also realizes external communication through the communication module.
Optionally, the communication module includes: a CAN module and an Ethernet module;
the Ethernet module is in communication connection with the SMU through an Ethernet switch;
the CAN module is in communication connection with the CMU or the SMU in the adjacent battery cluster.
Optionally, in each battery cluster, the CMU and the N BMUs are communicatively connected in a daisy chain communication manner.
The third aspect of the present invention also provides an energy storage system, including: a PCS (Power Conversion System), a BCP (Battery Collection Panel), an ethernet switch, M Battery clusters, and a Battery management System of the energy storage System as described above, where M is a positive integer; wherein:
the battery cluster comprises N multiplied by K battery cores which are connected in series; k and N are positive integers;
m battery clusters are connected in parallel to the input end of the BCP;
the output end of the BCP is connected with the direct current side of the PCS;
and the Ethernet switch is respectively in communication connection with the SMU and each CMU in the battery management system.
Optionally, the ethernet switch is further communicatively connected to an upper computer.
According to the battery management method of the energy storage system, each BMU uploads the acquired cell parameters to the corresponding CMU; then, the CMU judges whether the corresponding battery cluster has a fault according to the received battery core parameters and the collected battery cluster parameters; if the battery cluster runs normally, the corresponding CMU uploads the corresponding battery cluster characteristic data to the SMU through CAN communication; if the battery cluster fails, corresponding CMU uploads corresponding wave recording data to the SMU through Ethernet communication; compared with the prior art, the real-time interaction requirement satisfaction degree of high-capacity data in the energy storage system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of electrical connections of an energy storage system according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a communication connection relationship between devices of a battery management system according to an embodiment of the present invention;
fig. 3 is a flowchart of a battery management method of an energy storage system according to an embodiment of the present application;
fig. 4 is a schematic diagram of an internal structure of a CMU and a connection relationship between the CMU and an SMU according to an embodiment of the present invention;
fig. 5 and 6 are schematic diagrams of an internal structure of a CMU and a connection relationship between the CMU and an upper computer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides a battery management system of an energy storage system, which aims to solve the problem that the prior art cannot meet the real-time interaction requirement of high-capacity data.
As shown in fig. 1, the energy storage system includes: PCS, BCP, an Ethernet switch, M battery clusters and a battery management system, wherein M is a positive integer.
Wherein, the electrical connection relation of this energy storage system is: each battery cluster comprises NxK battery cells connected in series, and K and N are positive integers; the M battery clusters are connected in parallel to the input end of the BCP; the output of the BCP is connected to the dc side of the PCS.
The communication connection relation of the energy storage system is as follows: the battery management system and the PCS are in communication connection, and both are in communication connection with the EMS through the local controller, so that the EMS can complete unified coordination of charging and discharging of the energy storage system, and energy exchange between the energy storage system and a power grid is realized.
As shown in fig. 2, the battery management system includes: SMU, M CMUs, and M × N BMUs.
Each K series-connected battery cores are provided with one BMU, each battery cluster is provided with one CMU, and the SMU is arranged in the BCP.
As shown in fig. 2, in each battery cluster, the CMU is communicatively connected to the N BMUs, preferably by daisy-chain communication, so as to achieve information interaction in each battery cluster.
As shown in fig. 2, the CMUs in each battery cluster are also communicatively connected to the SMU through ethernet switches, respectively. The SMU and each CMU are communicated with the Ethernet switch in an Ethernet communication mode. And CMU links to each other with positive negative pole switch control end in the battery cluster, and SMU realizes cutting in, cutting out control to each battery cluster through issuing the instruction to each CMU. The SMU also directly controls the on-off of a positive electrode switch and a negative electrode switch in the BCP. In addition, the SMU is also in communication connection with an upper computer through Ethernet communication and in communication connection with EMS in the energy storage system through CAN communication, and CAN communication and Ethernet communication CAN exist between the SMU and a PCS controller at the same time. In practical application, each CMU can also be directly connected with an upper computer through an ethernet switch in a communication manner.
As shown in fig. 3, the battery management method of the energy storage system includes:
and S101, uploading the acquired cell parameters to a corresponding CMU in the battery management system by each BMU of the battery management system.
The cell parameters include: voltage, temperature and equilibrium state of the K electric cores corresponding to the BMU. It should be noted that, when the voltages of the individual cells are inconsistent, the CMU instructs the BMU to turn on the equalizing circuit, and fine-tunes the voltages of the local cells, and simultaneously, the CMU uploads the equalized state to the SMU to display whether the equalizing circuit is turned on.
In the same battery cluster, the data quantity uploaded to the CMU by the N BMUs is M multiplied by N multiplied by K multiplied by 3.
S102, the CMU judges whether the corresponding battery cluster has a fault according to the received battery core parameters and the collected battery cluster parameters.
The battery cluster parameters collected by the CMU include J parameters, which specifically are: the total voltage, the total current, the SOC, the SOH, the states of the positive and negative switches and the states of the positive and negative fuses of the corresponding battery cluster.
Any problem of any electric core or connection in the battery cluster is reflected by the corresponding electric core parameter and the battery cluster parameter, so that whether the corresponding battery cluster has a fault or not can be determined according to the parameters. If a certain battery cluster operates normally, step S103 is executed. If a certain battery cluster fails, step S105 is executed.
And S103, uploading the corresponding battery cluster characteristic data to the SMU through CAN communication by the CMU.
The battery cluster feature data includes: the battery cluster parameters, the voltage maximum value, the voltage minimum value, the temperature maximum value, the temperature minimum value and the balance state of all the internal battery cores of the corresponding battery cluster.
If the M battery clusters operate normally, the data quantity uploaded to the SMU by the M CMUs through CAN communication is M multiplied by 4+ M multiplied by N multiplied by K + M multiplied by J; the M × 4 refers to a voltage maximum value, a voltage minimum value, a temperature maximum value and a temperature minimum value of the M battery clusters, the M × N × K refers to a balanced state of all battery cells in the M battery clusters, and the M × J refers to battery cluster parameters of the M battery clusters. Then, step S104 is performed.
And S104, the SMU sends the running state parameters of each battery cluster to a PCS controller in the energy storage system through CAN communication.
The running state parameters are total current, SOC, SOH and other parameters, and the PCS controller controls the power devices in the PCS accordingly.
S105, the CMU uploads the corresponding wave recording data to the SMU through Ethernet communication.
The wave recording data comprises: and in a preset time period before and after the fault, the cell parameters received by the CMU and the collected battery cluster parameters. The specific setting of the preset duration is not limited herein, and is determined according to the application environment, and is within the protection scope of the present application.
If all the M battery clusters have faults, the data quantity uploaded to the SMU by the M CMUs through Ethernet communication is M multiplied by N multiplied by K multiplied by 3+ M multiplied by J.
Preferably, the SMU is configured with an expanded mass storage unit, and then after step S105, the method further includes:
and S106, expanding a large-capacity storage unit of the SMU to store the wave recording data.
The wave recording function of the externally-expanded large-capacity storage unit can be fault automatic triggering, and can also be that operation and maintenance personnel manually set a triggering condition through an upper computer, for example, the voltage is higher than a voltage threshold, the temperature is higher than a temperature threshold, and the like, and specific values of the thresholds are determined according to specific application environments, and are not limited herein and are all within the protection range of the application.
And then, the SMU can upload a large amount of stored wave recording data to an upper computer through an external Ethernet, so that a fault wave recording function is realized. In practical application, the SMU CAN also be uploaded to the EMS through CAN communication for energy management.
It should be noted that, when a fault occurs in any one of the cell level, the battery cluster level and the battery cluster parallel level, voltage and current waveforms in a preset time period before and after the corresponding fault can be uploaded to the host computer by the battery management system in any one of the above manners, so that a fault recording function is realized, and therefore when the fault occurs in such a huge system, the fault recording function can be responded quickly in time, accurate analysis and problem solution can be made, the energy storage system is recovered to be in grid-connected power generation, and the utilization rate is improved.
In addition, preferably, after step S101, the method for managing a battery of an energy storage system further includes:
and S201, when the CMUs meet corresponding preset uploading conditions, uploading the received battery core parameters and the collected battery cluster parameters to the SMU and/or the upper computer through Ethernet communication.
When operation and maintenance personnel control the energy storage system to virtually show the ripples according to actual need, satisfy corresponding preset upload condition promptly, at this moment, each CMU uploads the battery cluster parameter of electric core parameter and the battery parameter of gathering received through the ethernet communication, and the data bulk that M CMU uploaded is MXNXKX3 + MXJ. Each CMU can be uploaded to the SMU through the Ethernet switch and the internal Ethernet, and then uploaded to the upper computer through the SMU through the external Ethernet, and displayed on the upper computer in real time in a waveform mode, so that a virtual oscillography function is realized; or, preferably, the upper computer is also in communication connection with the ethernet switch, and at this time, each CMU can be directly uploaded to the upper computer through the ethernet switch, so as to implement the virtual oscillography function. It is not specifically limited herein, and is within the scope of the present application, depending on the application environment.
In addition, before and after any steps of the battery management method of the energy storage system in practical application, if an operation and maintenance person sends a CMU software upgrade package to the SMU through an upper computer by using external ethernet communication, the SMU may also issue the CMU software upgrade package to each CMU by using internal ethernet communication, thereby implementing a remote software upgrade function of each CMU.
As can be obtained from the communication connection relationship in fig. 2, the battery core is used as the most basic core device for the safety of the energy storage system, the voltage and current waveforms of the battery core can be transmitted to the CMUs in the same battery cluster through the corresponding BMUs, and then the CMUs transmit the large-capacity data in real time through the ethernet switch, so as to serve as the basis for the subsequent virtual oscillography and fault recording. Compared with the prior art, the battery management method provided by the embodiment not only improves the real-time interaction demand satisfaction degree of high-capacity data in the energy storage system, but also can realize a fault recording function, a virtual oscillography function and a CMU remote software upgrading function, and is beneficial to practical application and popularization.
Another embodiment of the present invention further provides a battery management system of an energy storage system, as shown in fig. 2, including: SMU, M CMUs and M N BMU, M and N are positive integers.
Each K series-connected battery cells are configured with one BMU, and K is also a positive integer; each battery cluster is provided with a CMU, the SMU is arranged in the BCP, and the SMU is further connected with an external expansion large-capacity storage unit and used for storing wave recording data uploaded by each CMU, so that the wave recording data can contain voltage and current waveforms in a longer time period, the preset time period can be a longer time period, and the large-capacity storage requirement of fault information is met.
As shown in fig. 2, in each battery cluster, the CMU is communicatively connected to the N BMUs, preferably by daisy-chain communication, so as to achieve information interaction in each battery cluster. Of course, in practical applications, other conventional communication methods may be adopted, which is only an example and depends on the specific application environment.
The SMU is sequentially connected in series with the CMUs in each battery cluster in a CAN communication mode in a communication mode, and receives battery cluster characteristic data uploaded by each CMU; and the CMUs in each battery cluster are also in communication connection with the SMU through the Ethernet switch respectively. The SMU and each CMU are communicated with the Ethernet switch in an Ethernet communication mode.
Each CMU controls the on-off of a positive switch and a negative switch in a corresponding battery cluster respectively, and the SMU sends instructions to each CMU to realize the cut-in and cut-out control of each battery cluster. The SMU also directly controls the on-off of a positive electrode switch and a negative electrode switch in the BCP.
The SMU is also in communication connection with the upper computer through Ethernet communication, and in practical application, each CMU can also be in communication connection with the upper computer directly through an Ethernet switch.
In addition, Ethernet communication is preferably adopted between the SMU and the PCS controller and between the SMU and the EMS; in practical application, conventional communication such as CAN communication or serial communication may also be adopted, or ethernet communication and any one of the above conventional communications are provided at the same time, and fig. 2 shows that the communication system is provided with both CAN communication and ethernet communication as an example; the method is not specifically limited herein, and may be determined according to an application environment, as long as a scheme that enables the SMU to upload the recording data to the EMS, and implement a fault recording data query function, and upload the battery cluster feature data to the EMS, and a scheme that enables the SMU and the PCS to implement information interaction are within the scope of the present application.
Preferably, each CMU may be as shown in fig. 4 to 6, and specifically includes: the device comprises a processor, a communication module, a data real-time cache region and an acquisition module.
The processor is respectively connected with the acquisition module and the data real-time cache region, and the data real-time cache region further realizes external communication through the communication module.
The communication module specifically includes: a CAN module and an Ethernet module.
Specifically, the CAN module is used for being in communication connection with CMU or SMU in an adjacent battery cluster.
The Ethernet module is used for connecting an Ethernet switch, and then realizes communication connection (as shown in figure 4) with the upper computer through the SMU, or directly communicates with the upper computer, so that each CMU directly uploads corresponding data to the upper computer through the Ethernet, and better information transmission real-time performance is guaranteed. No matter which way is adopted to realize the communication connection relation between the battery management system and the upper computer, the acquired information such as voltage, current, temperature and the like corresponding to all places in all battery clusters in the battery management system can be directly uploaded to the virtual oscilloscope module in the upper computer without being transferred through other controllers, and then the waveform display of the acquired information is carried out through the upper computer, namely the virtual oscilloscope function of multi-channel data is realized on the upper computer. In addition, no matter what manner is adopted, the ethernet module can finally realize the communication connection with the remote software upgrading module in the upper computer (as shown in fig. 6).
As shown in fig. 4, the CMU configures a real-time data buffer with a certain capacity, which may not be too large, as long as it can facilitate the high-speed unloading of normal operation data. When a fault occurs, the buffer data stored in the data real-time buffer area is used as data before the fault and is sent to the SMU, and the buffer data after the fault and the data after the fault are stored in an external large-capacity storage unit of the SMU together, so that the fault recording function is realized. In addition, the external large-capacity storage unit can also realize that data is not lost and stored after power failure, and specifically can adopt an external Flash device with the model W25Q64 BV.
In fig. 5, other connection devices between the ethernet module and the upper computer, i.e. an ethernet switch, or an SMU are omitted, which is not limited herein. The CMU is provided with a cache area with a certain capacity, so that normal operation data can be transferred at high speed in a large quantity. Each CMU uploads the virtual oscillography module of the upper computer in real time through the buffered data, and displays the multi-channel data on a display, thereby realizing the virtual oscillography function similar to an oscilloscope.
Specifically, the processor may adopt an ARM chip of a model STM32F417, the CAN module may adopt a chip of a model DP83848IVV, and the ethernet module may adopt a chip of a model HR 911103C. This is an example and not intended to be limiting.
The battery management system provided in this embodiment is used to implement the battery management method described in the above embodiment, and specific principles and processes of the method are not described in detail here, and reference may be made to the above embodiment.
It should be noted that, in the existing battery management system, each CMU inside the existing battery management system is originally connected with the SMU in a communication manner through conventional communication, such as CAN communication; for example, as shown in fig. 2, CMUs and SMUs are serially connected in sequence. That is to say, the battery management system provided in this embodiment can implement interaction of large-capacity information by adding an ethernet switch and a corresponding ethernet communication interface on the basis of the original system.
Moreover, in the conventional battery management system, the SMU originally communicates with the EMS through conventional communication, such as CAN communication. In the embodiment, on the basis of the original structure, the corresponding Ethernet communication interface is additionally arranged, so that high-capacity information interaction between the two is realized.
The battery management system provided by this embodiment configures ethernet communication interfaces for CMU, SMU, and EMS in a hierarchical manner on the premise that various information is interacted in a CAN communication manner, thereby implementing scale and timeliness of data interaction; and by the flexible application of the Ethernet communication function, the remote fault recording function is realized, the remote virtual oscilloscope function is realized, and the function of controlling the software remote upgrading is realized on the basis. The battery has the advantages of large data, remote and real-time communication functions, so that the battery can run more safely and stably in the whole energy storage system, and has better analyzability after a fault.
Another embodiment of the present invention further provides an energy storage system, as shown in fig. 1, including: PCS, BCP, ethernet switch (not shown), M battery clusters, and a battery management system (not shown), M being a positive integer.
Wherein, the electrical connection relation of this energy storage system is: each battery cluster comprises NxK battery cells connected in series, and K and N are positive integers; the M battery clusters are connected in parallel to the input end of the BCP; the output of the BCP is connected to the dc side of the PCS.
The Ethernet switch is respectively connected with the SMU and each CMU in the battery management system in a communication mode, or the Ethernet switch is also connected with the upper computer in a communication mode.
The structure and principle of the battery management system can be obtained by referring to the above embodiments, and are not described in detail herein.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are merely illustrative, wherein units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A battery management method of an energy storage system is applied to the battery management system of the energy storage system, and the battery management method of the energy storage system comprises the following steps:
each battery management unit BMU of the battery management system uploads the acquired cell parameters to a corresponding battery cluster management unit CMU in the battery management system;
the CMU judges whether the corresponding battery cluster has a fault according to the received battery core parameters and the collected battery cluster parameters;
if the battery cluster runs normally, the CMU uploads the corresponding battery cluster characteristic data to a system battery management unit (SMU) through CAN communication;
and if the battery cluster fails, the CMU uploads corresponding wave recording data to the SMU through Ethernet communication.
2. The battery management method of the energy storage system according to claim 1, wherein after the CMU uploads the corresponding recording data to the SMU via ethernet communication, the method further comprises:
and the external large-capacity storage unit of the SMU stores the wave recording data.
3. The battery management method of the energy storage system according to claim 1, wherein after each battery management unit BMU of the battery management system uploads the acquired cell parameters to a corresponding battery cluster management unit CMU in the battery management system, the method further includes:
and when each CMU meets corresponding preset uploading conditions, uploading the received battery core parameters and the acquired battery cluster parameters to the SMU and/or the upper computer through Ethernet communication.
4. The battery management method of the energy storage system according to claim 1, wherein after the CMU uploads the corresponding battery cluster characteristic data to a system battery management unit SMU through CAN communication, the method further comprises:
and the SMU sends the running state parameters of each battery cluster to a controller of an energy storage inverter PCS in the energy storage system through CAN communication.
5. The battery management method of the energy storage system according to claim 1, further comprising, before or after any of the steps:
and when the SMU receives a CMU software upgrading package sent by an upper computer through Ethernet communication, the SMU sends the CMU software upgrading package to each CMU through the Ethernet communication.
6. The battery management method of the energy storage system according to any one of claims 1 to 5, wherein the cell parameters include: the voltage, temperature and equilibrium state of each corresponding cell;
the battery cluster parameters include: the total voltage, the total current, the state of charge SOC, the state of health SOH, the states of the positive and negative switches and the states of the positive and negative fuses of the corresponding battery cluster.
7. The battery management method of the energy storage system according to claim 6, wherein the recording data comprises: and in a preset time period before and after the fault, the cell parameters received by the CMU and the collected battery cluster parameters.
8. The battery management method of the energy storage system according to claim 6, wherein the battery cluster characterization data comprises: the battery cluster parameters, the voltage maximum value, the voltage minimum value, the temperature maximum value, the temperature minimum value and the balance state of all the internal battery cores of the corresponding battery cluster.
9. A battery management system for an energy storage system, comprising: SMU, M CMUs and M multiplied by N BMUs, wherein M and N are positive integers; wherein:
each battery cluster of the energy storage system is respectively provided with a CMU and N BMUs which are in communication connection;
the SMU is arranged in a battery collecting cabinet BCP of the energy storage system and is connected with an external expansion large-capacity storage unit;
the SMU is in communication connection with each CMU through an Ethernet switch and is in serial communication connection with each CMU in sequence through CAN communication;
the SMU is in communication connection with an upper computer through Ethernet communication, and is in communication connection with a controller of a PCS (Power System controller) in the energy storage system and an energy management System EMS (energy management System) through CAN communication and/or Ethernet communication;
the battery management system is used for executing the battery management method of the energy storage system according to any one of claims 1 to 8.
10. The battery management system of the energy storage system of claim 9, wherein the CMU comprises: the system comprises a processor, a communication module, a data real-time cache region and an acquisition module;
the processor is respectively connected with the acquisition module and the data real-time cache region;
the data real-time cache region also realizes external communication through the communication module.
11. The battery management system of the energy storage system of claim 10, wherein the communication module comprises: a CAN module and an Ethernet module;
the Ethernet module is in communication connection with the SMU through an Ethernet switch;
the CAN module is in communication connection with the CMU or the SMU in the adjacent battery cluster.
12. The battery management system of the energy storage system according to claim 9, wherein in each battery cluster, the CMU is communicatively connected to the N BMUs in a daisy-chain communication manner.
13. An energy storage system, comprising: a PCS, a BCP, an ethernet switch, M battery clusters and a battery management system of an energy storage system according to any of claims 9-12, M being a positive integer; wherein:
the battery cluster comprises N multiplied by K battery cores which are connected in series; k and N are positive integers;
m battery clusters are connected in parallel to the input end of the BCP;
the output end of the BCP is connected with the direct current side of the PCS;
and the Ethernet switch is respectively in communication connection with the SMU and each CMU in the battery management system.
14. The energy storage system of claim 13, wherein the ethernet switch is further communicatively coupled to an upper computer.
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