CN113285507B - Battery cluster parallel connection method and related device - Google Patents

Battery cluster parallel connection method and related device Download PDF

Info

Publication number
CN113285507B
CN113285507B CN202110566862.0A CN202110566862A CN113285507B CN 113285507 B CN113285507 B CN 113285507B CN 202110566862 A CN202110566862 A CN 202110566862A CN 113285507 B CN113285507 B CN 113285507B
Authority
CN
China
Prior art keywords
parallel
battery cluster
voltage
preset
battery
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.)
Active
Application number
CN202110566862.0A
Other languages
Chinese (zh)
Other versions
CN113285507A (en
Inventor
陈晓光
马伟
邵俊伟
陈飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sungrow Power Supply Co Ltd
Original Assignee
Sungrow Power Supply Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sungrow Power Supply Co Ltd filed Critical Sungrow Power Supply Co Ltd
Priority to CN202110566862.0A priority Critical patent/CN113285507B/en
Publication of CN113285507A publication Critical patent/CN113285507A/en
Application granted granted Critical
Publication of CN113285507B publication Critical patent/CN113285507B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00045—Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
    • 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
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • 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
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • 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)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a battery cluster parallel connection method and a related device, wherein a CMU (central processing unit) of a battery cluster to be connected in parallel can acquire the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster which is connected in parallel, and judge whether the difference value of the two voltages is within a preset difference value range, if so, the difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster which is connected in parallel is smaller, and at the moment, a preset main loop relay of the battery cluster to be connected in parallel is closed, so that the battery cluster to be connected in parallel and the battery cluster which is connected in parallel are connected in parallel, the current value of circulation can be reduced, and the running safety and reliability of a BMS system are improved.

Description

Battery cluster parallel connection method and related device
Technical Field
The invention relates to the field of Battery Management Systems (BMS), in particular to a battery cluster parallel connection method and a related device.
Background
In a battery management system BMS system, a CMU (battery cluster (RACK) level BMS) is connected to a plurality of battery management units BMU, each BMU is disposed in a battery module PACK, and a plurality of PACKs form a battery cluster RACK. In a BMS there are typically a plurality of RACK, which are connected in parallel with other RACK when closing the main loop relay in RACK.
Due to different factors such as delivery capacity or delivery time, the voltage between RACK has difference, circulation is formed between RACK, when the voltage difference is overlarge, the current value of circulation is large, the running of the BMS system is influenced, even the BMS system fails and cannot run, and the running safety and reliability of the BMS system are reduced.
Disclosure of Invention
In view of the above, the invention provides a parallel connection method of battery clusters and a related device, which are used for solving the problems that when the voltage difference between RACK is too large, the current value of circulation is larger and the running safety and reliability of a BMS system are reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
a battery cluster parallel method applied to CMUs in a battery cluster to be connected in parallel, the battery cluster parallel method comprising:
under the condition that the battery clusters to be connected in parallel successfully execute the preset parallel basic operation, acquiring the voltage of the battery clusters to be connected in parallel and the parallel voltage of the battery clusters which are connected in parallel;
judging whether the difference value between the voltage of the battery cluster to be connected in parallel and the parallel voltage is within a preset difference value range;
if yes, closing a preset main loop relay of the battery cluster to be connected in parallel.
Optionally, determining that the to-be-connected battery cluster has successfully performed a preset parallel basic operation includes:
determining whether other battery clusters have closed a primary loop relay in the battery cluster;
if not, executing the self-checking operation of the preset host;
after the self-checking operation of the preset host is finished, judging whether an operation command is received or not;
if yes, carrying out pre-charging operation on the battery clusters to be connected in parallel, and after the pre-charging operation is finished, determining that the battery clusters to be connected in parallel successfully execute preset parallel basic operation.
Optionally, performing a preset host self-test operation includes:
judging whether a preset fault exists, whether the PCS system connected with the CMU can normally communicate, whether a shutdown command is received or not, and whether a startup command is received or not;
and under the conditions that the preset fault does not exist, the PCS system connected with the CMU can normally communicate, and the shutdown command and the startup command are not received, the self-checking operation of the preset host is determined to be completed.
Optionally, in the case that it is determined that there are other battery clusters that have closed the main loop relay in the battery cluster, the method further includes:
executing self-checking operation of a preset slave;
after the self-checking operation of the preset slave machine is finished, judging whether an operation command is received or judging whether the host machine is in an operation mode; the host is a CMU in a battery cluster of the first closed main loop relay;
and if the operation command is received or the host is in the operation mode, carrying out the pre-charging operation on the battery cluster to be connected in parallel, and determining that the battery cluster to be connected in parallel successfully executes the preset parallel basic operation after the pre-charging operation is finished.
Optionally, executing a preset slave self-checking operation, including:
judging whether a preset fault exists, whether a shutdown command is received or not, and whether the host is not in a startup state or not;
and under the conditions that the preset fault does not exist, the shutdown command is not received and the host is not in a startup state, determining that the self-checking operation of the preset slave is finished.
Optionally, in the case that the difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage is not within a preset difference range, the method further includes:
after a preset time interval, the step of acquiring the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation is performed back.
Optionally, obtaining the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation includes:
and acquiring the voltage of the battery cluster to be connected in parallel and the terminal voltage of the PCS system, which are obtained by sampling by the voltage sampling circuit of the battery cluster to be connected in parallel, and taking the terminal voltage of the PCS system as the parallel voltage.
A battery cluster parallel device for use in a CMU in a battery cluster to be connected in parallel, the battery cluster parallel device comprising:
the voltage acquisition module is used for acquiring the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation under the condition that the battery cluster to be connected in parallel successfully executes the preset parallel basic operation;
the judging module is used for judging whether the difference value between the voltage of the battery cluster to be connected in parallel and the parallel voltage is within a preset difference value range;
and the relay closing module is used for closing the preset main loop relay of the battery cluster to be connected in parallel if yes.
A storage medium comprising a stored program, wherein the program performs the above-described battery cluster parallel method.
A CMU comprising: a memory and a processor;
wherein the memory is used for storing programs;
the processor invokes a program and is configured to perform the above-described method of battery cluster parallelization.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a battery cluster parallel connection method and a related device, wherein a CMU (central processing unit) of a battery cluster to be connected in parallel can acquire the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster which is connected in parallel, and judge whether the difference value of the two voltages is within a preset difference value range, if so, the difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster which is connected in parallel is smaller, and at the moment, a preset main loop relay of the battery cluster to be connected in parallel is closed, so that the battery cluster to be connected in parallel and the battery cluster which is connected in parallel are connected in parallel, the current value of circulation can be reduced, and the running safety and reliability of a BMS system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a BMS system according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for parallel connection of battery clusters according to an embodiment of the present invention;
fig. 3 is a communication scenario diagram of a CMU according to an embodiment of the present invention;
FIG. 4 is a flowchart of another method for parallel connection of battery clusters according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for providing a parallel connection method of battery clusters according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a scenario of host self-checking according to an embodiment of the present invention;
fig. 7 is a schematic view of a self-checking scenario of a slave machine according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a parallel device for battery clusters according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a structure diagram of a battery management system BMS, which mainly includes the following structures:
BMU: the PACKBS with the functions of cell voltage and temperature sampling, passive equalization and the like is arranged in the PACK, adopts a software-free design, and realizes communication and control functions through a differential UART daisy chain.
CMU: the power supply device is arranged in the switch box and has the functions of SOC calculation, PACKBS control, main power circuit on-off control and the like. Wherein RACK is a battery cluster.
SMU (system level BMS): the system is arranged in a direct current power distribution cabinet and has the functions of environment monitoring (selecting and matching), RACK BMS control and main power circuit on-off control.
In a BMS system, the BMS system is divided into three-level architecture, wherein the first-level architecture is SMU, the second-level architecture is CMU, and the three-level architecture is BMU, and the three-level architecture forms a communication architecture of the BMS. A CMU is connected to a plurality of BMUs, each BMU being arranged in a battery PACK, and the battery PACKs being connected in series to form a battery cluster RACK. The single RACK comprises N series battery modules, a CMU control board and an AD acquisition circuit, and is mainly used for acquiring total voltage of a battery end and total voltage of a PCS end and a master control relay. The battery terminal voltage and the PCS terminal voltage should be theoretically equal when the main loop relay is closed as shown in fig. 1.
The plurality of battery clusters are connected in parallel. The SMU can communicate with CMUs in the battery module, and the CMUs can communicate with BMUs internal to the battery module.
More specifically:
a battery module PACK is formed by connecting a plurality of electric cores in parallel or in series, and a BMU in the PACK is responsible for sampling the voltages of all the electric cores in the PACK and sampling the temperature points arranged in the PACK, so that the electric cores in the PACK are balanced under certain conditions.
A plurality of battery modules PACK are connected in series to form a battery cluster RACK, a CMU is arranged in the RACK, and the CMU mainly functions to collect total voltage and total current after the PACKs are connected in series, control the relay (P+ and P-) to be closed and opened, calculate the state of charge SOC and the like.
The voltage and the current after the RACK are connected in parallel are supplied to a PCS (process control system) through a BCP (binary coded decimal) bus cabinet, so that the power distribution conversion of energy storage, a power grid and a photovoltaic system is realized. The BCP is internally provided with SMUs, and the main function is to collect information such as voltage, current, temperature and the like of the multi-CMU and then to gather the information to the PCS controller.
The PCS controller interacts with the energy management unit EMS to realize the control requirement with the terminal customer.
The LC in fig. 1 is a local controller, and is responsible for managing the SMU devices of the lower computer, and receiving the scheduling control of the devices such as the EMS devices of the upper computer;
the PC, i.e., the local computer, is responsible for receiving the EMS data and displaying and storing the sampled data.
And a power control circuit: and the hardware circuit is used for realizing conversion between direct current at the battery end and alternating current at the user end.
In general, in a BMS system, a plurality of RACK exist, due to different factors such as delivery capacity or delivery time, the total voltage of the RACK is different, when the total voltage difference is overlarge, circulation is formed among the RACK, the current value of the circulation is large, and after the current is larger than a certain value, the normal operation of the system is affected, and even faults are reported, so that the system cannot operate.
In order to solve the problems of the reliability and safety of the BMS system due to the circulation, the inventors found that the total pressure of the RACK can be manually adjusted to be within the allowable range of the differential pressure before the parallel connection, and then the parallel connection is performed, so that the total pressure of the RACK is consistent through the circulation.
However, this method requires manual operations and corresponding charging and discharging equipment, which increases costs and reduces reliability and accuracy.
Further, in order to solve the problem caused by manual voltage regulation, the inventor finds that the CMU can also transmit the total pressure of the CMU to the SMU through the communication link between the SMU and the CMU, the SMU gathers the total pressure of each RACK, calculates the pressure difference, judges the CMU which can be connected in parallel currently, then sends a command to the CMU through communication, and the CMU controls the on-off of the main loop relay in the RACK to realize multi-machine parallel connection.
However, this solution depends on the stability of the SMU and the communication link, and in some small BMS systems, SMU is not provided, and to implement this solution, SMU needs to be added, and the addition of SMU increases hardware cost and corresponding size.
In order to solve the above technical problems, the inventors have found that the voltage of a battery cluster and the voltage difference of parallel voltages of the already parallel battery clusters can be compared by the CMU in the battery cluster, and when the voltage difference is small, it is explained that the voltage of the battery cluster and the overall voltage of the already parallel battery cluster are small, and at this time, the CMU controls the main loop relays in the battery cluster, i.e., p+ and P-in fig. 1, so that the battery cluster is also incorporated into the already parallel battery cluster.
This approach requires only the CMU to calculate and control and does not require the SMU, so it is not dependent on stability with the SMU and the communication link, and can be applied to SMU-free systems.
Specifically, the CMU of the battery cluster to be connected in parallel acquires the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation, and judges whether the difference value of the two voltages is within a preset difference value range, if yes, it is indicated that the voltage difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation is smaller, and at the moment, the preset main loop relay of the battery cluster to be connected in parallel is closed, so that the battery cluster to be connected in parallel with the battery cluster subjected to parallel operation can reduce the current value of the circulating current, and the running safety and reliability of the BMS system are improved.
Based on the foregoing, an embodiment of the present invention provides a battery cluster parallel connection method, which is applied to a CMU in a battery cluster to be connected in parallel, and referring to fig. 2, the battery cluster parallel connection method includes:
and S11, under the condition that the battery clusters to be connected in parallel successfully execute the preset parallel basic operation, acquiring the voltage of the battery clusters to be connected in parallel and the parallel voltage of the battery clusters which are connected in parallel.
In this embodiment, the battery cluster to be connected in parallel refers to a battery cluster that needs to be determined whether to perform parallel operation, such as the leftmost battery cluster in fig. 1.
It should be noted that, in a BMS system, a plurality of battery clusters are generally provided, and CMUs in each battery cluster independently determine whether parallel operation is required.
The battery clusters to be connected in parallel are provided with corresponding voltage sampling circuits, and the voltage sampling circuits can be the AD acquisition circuits. The voltage sampling circuit is used for collecting the total voltage of the battery segments of the battery cluster.
In addition, referring to fig. 3, a daisy chain communication mode is adopted between the CMU and the BMU in the battery cluster to acquire data stored in the BMU. The CMU and PCS system communicate via CAN. The AD acquisition circuit is also used for acquiring terminal voltage of the PCS system, wherein the terminal voltage is parallel voltage of the battery clusters which are subjected to parallel operation.
That is, acquiring the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster that has been subjected to the parallel operation includes:
and acquiring the voltage of the battery cluster to be connected in parallel and the terminal voltage of the PCS system, which are obtained by sampling by the voltage sampling circuit of the battery cluster to be connected in parallel, and taking the terminal voltage of the PCS system as the parallel voltage.
S12, judging whether the difference value between the voltage of the battery cluster to be connected in parallel and the parallel voltage is within a preset difference value range; if yes, go to step S13.
Specifically, a difference value between the voltage of the battery cluster to be connected in parallel and the parallel voltage is calculated, and whether the difference value is within a preset difference value range is judged.
And S13, closing a preset main loop relay of the battery cluster to be connected in parallel.
When the difference value is within the preset difference value range, the difference value of the overall parallel voltage of the battery cluster to be connected in parallel and the battery cluster already connected in parallel is smaller, the battery cluster to be connected in parallel is combined, the current value of the generated circulation is smaller, and the reliability and the safety of the BMS system are not affected.
At this time, the preset main loop relay of the battery cluster to be connected in parallel, namely, the above-mentioned P+ and P-, is closed, so that the battery cluster is also incorporated into the battery cluster connected in parallel.
In another embodiment of the present invention, in the case that the difference value is not within the preset difference value range, referring to fig. 4, the method further includes:
s24, starting timing.
S25, timing a preset time interval; if yes, returning to the execution step S22; if not, continuing to time.
If the difference value is not within the preset difference value range, the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation need to be obtained continuously after a preset time interval, and the difference value is calculated continuously and whether the difference value is within the preset difference value range or not is required.
Taking the number 1-5 battery clusters as an example for illustration, it is assumed that the number 1 and the number 2 battery clusters are connected in parallel, the number 3, 4 and the number 5 battery clusters need to judge whether the battery clusters can be connected in parallel or not, and when the battery clusters can be connected in parallel, a preset main loop relay is closed to be connected in parallel with the connected battery clusters.
The battery cluster 3 acquires own voltage, such as 110V, the parallel voltage of 1 and 2 is 130V, the difference value of the two is 20V, and the 20V is larger than a preset difference value range, such as (0-18V).
And the parallel operation cannot be performed in the step 3, a preset time interval needs to be waited, and the voltage is continuously acquired and whether the voltage is in a preset difference range is judged.
It is assumed that the number 4 battery clusters are connected in parallel in a preset time interval, the voltage of the number 4 battery clusters is 120V, the parallel voltages of the numbers 1, 2 and 4 are 120V, the difference between the voltage of the number 3 and the voltage of the number 110V is 10V, and the voltage is in the range of 0-18V, and the number 3 can be connected in parallel.
In this embodiment, the waiting for the preset time interval can avoid the situation that the voltage difference is no longer preset for the difference range due to the instability of the voltage acquired last time, besides the fact that other battery clusters can be integrated within the preset time interval, which results in the fact that the battery clusters to be connected in parallel can also be integrated.
It should be noted that, in practical application, no other battery clusters may be incorporated in the preset time interval, after the preset time interval is reached, there may be a voltage of the parallel battery clusters at this time, and a difference value of parallel voltages of the battery clusters that have been subjected to parallel operation is no longer within a preset difference value range, and at this time, the next preset time interval is continued to be waited.
In addition, for the explanation of other steps in fig. 4, please refer to the corresponding explanation in the above embodiment, and the explanation is omitted here.
In this embodiment, the CMU of the battery cluster to be connected in parallel may obtain the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster that has been connected in parallel, and determine whether the difference between the two voltages is within the preset difference range, if yes, it is indicated that the voltage difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster that has been connected in parallel is smaller, and at this time, the preset main loop relay of the battery cluster to be connected in parallel is closed, so that the battery cluster to be connected in parallel with the battery cluster that has been connected in parallel, which can reduce the current value of the circulating current and improve the safety and reliability of the operation of the BMS system. And before the combination, whether the pressure difference of the system meets the condition or not can be judged, so that the large current brought by blind parallel operation is avoided, and the stability of the system is improved.
In addition, in the invention, the parallel processing of each RACK system does not need the cooperative processing of other processors, and the parallel processing is self-adaptive, so that the interference of a system communication link is eliminated, and the system reliability is improved.
In addition, the invention does not need manual operation and corresponding charging and discharging equipment, thereby reducing the cost and improving the reliability.
The foregoing embodiment describes that the to-be-connected battery cluster needs to successfully perform the preset parallel basic operation before the voltage is acquired, and describes a specific implementation process of the to-be-connected battery cluster, and referring to fig. 5, determining that the to-be-connected battery cluster has successfully performed the preset parallel basic operation may include:
s31, determining whether other battery clusters are closed to the main loop relay in the battery cluster. If not, executing step S32; if so, step S35 is performed.
In practical applications, when there are multiple battery clusters in the BMS system, the CMU in the battery cluster is set as a master or a slave.
Wherein, the host computer and the slave computer are provided with two modes:
1. the first implementation mode:
when the CMU leaves the factory, the identification is configured in the hardware of the CMU, if the identification is configured as the host, the CMU is the host, and if the identification is configured as the slave, the CMU is the slave. The CMU may obtain the identification when powered up to determine whether it is a master or a slave.
2. The second implementation mode:
after one CMU is powered on through CAN communication, each CMU judges whether the CMU sends a message of a host or a slave from a CAN channel, if not, the CMU sends a message of 'I are host', and other CMUs receive the message.
If the CMU sends the information of 'I are the host' on the CAN channel, the CMU is automatically the slave, and determines how many slaves have sent the message from the CAN channel, wherein the slaves CAN sort themselves according to the sequence of sending the message, the first CMU sends 'I are the slaves 1', the second CMU sends 'I are the slaves 2', and so on.
In this embodiment, each CMU automatically performs sequencing of the master and the slave according to the order in which the messages are sent.
In either of the above modes, all CMUs are divided into a master and a plurality of slaves, and in practical application, the master preferably closes its own main loop relay, and then the slaves can close their own main loop relay.
Taking the above-mentioned second way of determining the master-slave machine as an example, in this embodiment, it is determined whether or not there are other battery clusters that have already closed the main loop relay in the battery cluster, that is, it is determined whether or not the master machine has already closed the main loop relay in the battery cluster, and since the master machine preferentially closes its own main loop relay, it is considered that the master machine has already closed the main loop relay as long as at least one of the main loop relays in the battery clusters is closed, and the parallel operation is performed. Whether other slaves perform the slave operation or not, the embodiment may not perform analysis.
Determining whether other battery clusters have closed the primary loop relay in the battery cluster CAN be accomplished by determining whether there is a CMU in the CAN loop that sends a message that "i are master" or "i are slaves", and if so, considering that other battery clusters have closed the primary loop relay in the battery cluster. If not, it is considered that no battery cluster has already closed the main loop relay in the battery cluster.
S32, executing a preset host self-checking operation.
In practical application, executing a preset host self-checking operation includes:
judging whether a preset fault exists, whether the PCS system connected with the CMU can normally communicate, whether a shutdown command is received or not, and whether a startup command is received or not;
and under the conditions that the preset fault does not exist, the PCS system connected with the CMU can normally communicate, and the shutdown command and the startup command are not received, the self-checking operation of the preset host is determined to be completed.
The preset faults in this embodiment refer to the secondary and tertiary faults, and the normal communication of the PCS system connected to the CMU refers to whether there is no PCS communication for 20 minutes, that is, whether there is 20 minutes unsuccessful communication with the PCS system.
More specifically, referring to fig. 6, the host enters a self-checking mode to determine whether a shutdown command is received, if the shutdown command is received, the host enters the shutdown mode, if the shutdown command is not received, whether a three-level fault exists is determined, if the three-level fault exists, the shutdown mode is entered, if the three-level fault does not exist, whether the startup command is received, if the startup command is received, the startup mode is entered, if the startup command is not received, whether PCS communication is not performed for 20 minutes is determined, if the startup mode is entered, if the two-level fault exists, the failure mode is entered, and if the two-level fault does not exist, the self-checking operation of the preset host is completed.
S33, judging whether an operation command is received or not; if yes, go to step S34; if not, continuing to wait.
The running command and the power-on and power-off commands in this embodiment are sent by the PCS.
S34, carrying out pre-charging operation on the battery clusters to be connected in parallel, and after the pre-charging operation is finished, determining that the battery clusters to be connected in parallel successfully execute preset parallel basic operation.
Specifically, referring to fig. 6, after receiving the operation command, a pre-charging operation is performed, and after the pre-charging is successful, an operation mode is entered, which indicates that the to-be-connected battery cluster has successfully performed a preset parallel basic operation.
If the pre-charging is unsuccessful, a fault mode is entered.
S35, executing self-checking operation of the preset slave machine.
After the master exists or the master and the slave are connected in parallel, the CMU is used as the slave at the moment, and the self-checking operation of the preset slave is executed.
In practical application, executing the self-checking operation of the preset slave machine comprises the following steps:
judging whether a preset fault exists, whether a shutdown command is received or not, and whether the host is not in a startup state or not;
and under the conditions that the preset fault does not exist, the shutdown command is not received and the host is not in a startup state, determining that the self-checking operation of the preset slave is finished.
The preset faults in this embodiment refer to secondary and tertiary faults.
More specifically, referring to fig. 7, the slave machine enters a self-checking mode to determine whether a shutdown command is received, if yes, the slave machine enters the shutdown mode, if no, whether a three-level fault exists is determined, if yes, the shutdown mode is entered, if no, whether the host machine is in a startup state is determined, if yes, the slave machine enters the startup mode, if no, whether a two-level fault exists is determined, if yes, the fault mode is entered, and if no, the self-checking operation of the slave machine is preset to be completed.
S36, judging whether an operation command is received or whether the host is in an operation mode; if yes, go to step S37; if not, continuing to wait.
S37, performing pre-charging operation on the battery clusters to be connected in parallel, and after the pre-charging operation is finished, determining that the battery clusters to be connected in parallel successfully execute a preset parallel basic operation.
Specifically, referring to fig. 7, after the host computer is in the operation mode or receives an operation command, a pre-charging operation is performed, and after the pre-charging is successful, the host computer enters the operation mode, which indicates that the to-be-connected battery cluster has successfully performed a preset parallel basic operation.
If the 5-minute pre-filling is not completed, the pre-filling is continued until the pre-filling is successful.
In this embodiment, the master is preferably incorporated, that is, no other slave RACK is incorporated before the system is incorporated, at this time, the master starts the precharge process, and after the precharge is fault-free, the relay is automatically closed, and the system is incorporated.
Then, the slave machine is incorporated, namely, when the RACK closed relay exists in the current system, the slave machine samples the battery terminal voltage and the PCS terminal voltage through the AD at the moment, and when the differential pressure meets a certain condition, the relay is actively closed, and the system is incorporated. When the condition is not satisfied, a certain time is separated from the opportunity, and whether the combination condition is satisfied is circularly judged, so that the method independent of communication and a third-party processor self-adaptive parallel operation is achieved.
In this embodiment, no matter the master machine or the slave machine, before parallel connection, a self-checking operation and a pre-charging operation are executed, so that the reliability of the battery cluster and the stability before parallel connection are ensured.
In addition, the slave machine is self-adaptive and is connected in parallel, and the slave machine can be circularly judged until the parallel condition is met under the condition that the system does not meet the parallel condition, and other hardware support is not needed.
Optionally, on the basis of the embodiment of the above-mentioned battery cluster parallel connection method, another embodiment of the present invention provides a battery cluster parallel connection device, which is applied to a CMU in a battery cluster to be connected in parallel, referring to fig. 8, and includes:
a voltage obtaining module 11, configured to obtain a voltage of the to-be-parallel battery cluster and a parallel voltage of the battery cluster that has been subjected to parallel operation, when it is determined that the to-be-parallel battery cluster has successfully performed a preset parallel basic operation;
a judging module 12, configured to judge whether a difference value between the voltage of the to-be-parallel battery cluster and the parallel voltage is within a preset difference value range;
and the relay closing module 13 is used for closing the preset main loop relay of the battery cluster to be connected in parallel if yes.
Further, the voltage acquisition module 11 includes:
a determination submodule for determining whether other battery clusters have closed the main loop relay in the battery cluster;
the first self-checking sub-module is used for executing the self-checking operation of the preset host if the first self-checking sub-module does not exist;
the first judging sub-module is used for judging whether an operation command is received or not after the self-checking operation of the preset host is finished;
and the first pre-charging sub-module is used for carrying out pre-charging operation on the battery clusters to be connected in parallel if the battery clusters to be connected in parallel are in the pre-charging state, and determining that the battery clusters to be connected in parallel successfully execute the preset parallel basic operation after the pre-charging operation is finished.
Further, the first self-checking sub-module is specifically configured to:
judging whether a preset fault exists, whether the PCS system connected with the CMU can normally communicate, whether a shutdown command is received or not, and whether a startup command is received or not;
and under the conditions that the preset fault does not exist, the PCS system connected with the CMU can normally communicate, and the shutdown command and the startup command are not received, the self-checking operation of the preset host is determined to be completed.
Further, the voltage acquisition module 11 further includes:
the second self-checking sub-module is used for executing self-checking operation of the preset slave machine under the condition that other battery clusters are determined to close the main loop relay in the battery cluster;
the second judging sub-module is used for judging whether an operation command is received or judging whether the host is in an operation mode after the self-checking operation of the preset slave is finished; the host is a CMU in a battery cluster of the first closed main loop relay;
and the second pre-charging sub-module is used for carrying out pre-charging operation on the battery cluster to be connected in parallel if the operation command is received or the host is in an operation mode, and determining that the battery cluster to be connected in parallel successfully executes the preset parallel basic operation after the pre-charging operation is finished.
Further, the second self-checking sub-module is specifically configured to:
judging whether a preset fault exists, whether a shutdown command is received or not, and whether the host is not in a startup state or not;
and under the conditions that the preset fault does not exist, the shutdown command is not received and the host is not in a startup state, determining that the self-checking operation of the preset slave is finished.
Further, the voltage acquisition module 11 is further configured to:
and under the condition that the difference value between the voltage of the battery cluster to be connected in parallel and the parallel voltage is not in the preset difference value range, acquiring the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation after a preset time interval.
Further, the voltage acquisition module 11 is specifically configured to:
and acquiring the voltage of the battery cluster to be connected in parallel and the terminal voltage of the PCS system, which are obtained by sampling by the voltage sampling circuit of the battery cluster to be connected in parallel, and taking the terminal voltage of the PCS system as the parallel voltage.
In this embodiment, the CMU of the battery cluster to be connected in parallel may obtain the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster that has been connected in parallel, and determine whether the difference between the two voltages is within the preset difference range, if yes, it is indicated that the voltage difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster that has been connected in parallel is smaller, and at this time, the preset main loop relay of the battery cluster to be connected in parallel is closed, so that the battery cluster to be connected in parallel with the battery cluster that has been connected in parallel, which can reduce the current value of the circulating current and improve the safety and reliability of the operation of the BMS system. And before the combination, whether the pressure difference of the system meets the condition or not can be judged, so that the large current brought by blind parallel operation is avoided, and the stability of the system is improved.
It should be noted that, in the working process of each module and sub-module in this embodiment, please refer to the corresponding description in the above embodiment, and the description is omitted here.
Optionally, on the basis of the embodiment of the method and the device for parallel connection of battery clusters, another embodiment of the invention provides a storage medium, wherein the storage medium comprises a stored program, and the program executes the method for parallel connection of battery clusters.
Optionally, on the basis of the embodiment of the method and the device for parallel connection of battery clusters, another embodiment of the present invention provides a CMU, including: a memory and a processor;
wherein the memory is used for storing programs;
the processor invokes a program and is configured to perform the above-described method of battery cluster parallelization.
In this embodiment, the CMU of the battery cluster to be connected in parallel may obtain the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster that has been connected in parallel, and determine whether the difference between the two voltages is within the preset difference range, if yes, it is indicated that the voltage difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster that has been connected in parallel is smaller, and at this time, the preset main loop relay of the battery cluster to be connected in parallel is closed, so that the battery cluster to be connected in parallel with the battery cluster that has been connected in parallel, which can reduce the current value of the circulating current and improve the safety and reliability of the operation of the BMS system. And before the combination, whether the pressure difference of the system meets the condition or not can be judged, so that the large current brought by blind parallel operation is avoided, and the stability of the system is improved.
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 (9)

1. A battery cluster parallel method, characterized by being applied to CMUs in a battery cluster to be connected in parallel, comprising:
under the condition that the battery clusters to be connected in parallel successfully execute the preset parallel basic operation, acquiring the voltage of the battery clusters to be connected in parallel and the parallel voltage of the battery clusters which are connected in parallel;
judging whether the difference value between the voltage of the battery cluster to be connected in parallel and the parallel voltage is within a preset difference value range;
if yes, closing a preset main loop relay of the battery cluster to be connected in parallel;
the method for obtaining the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation comprises the following steps:
and acquiring the voltage of the battery cluster to be connected in parallel and the terminal voltage of the PCS system, which are obtained by sampling by the voltage sampling circuit of the battery cluster to be connected in parallel, and taking the terminal voltage of the PCS system as the parallel voltage.
2. The battery cluster paralleling method of claim 1, wherein determining that the battery cluster to be parallelized has successfully performed a preset parallelized basis operation comprises:
determining whether other battery clusters have closed a primary loop relay in the battery cluster;
if not, executing the self-checking operation of the preset host;
after the self-checking operation of the preset host is finished, judging whether an operation command is received or not;
if yes, carrying out pre-charging operation on the battery clusters to be connected in parallel, and after the pre-charging operation is finished, determining that the battery clusters to be connected in parallel successfully execute preset parallel basic operation.
3. The method of claim 2, wherein performing a preset host self-test operation comprises:
judging whether a preset fault exists, whether the PCS system connected with the CMU can normally communicate, whether a shutdown command is received or not, and whether a startup command is received or not;
and under the conditions that the preset fault does not exist, the PCS system connected with the CMU can normally communicate, and the shutdown command and the startup command are not received, the self-checking operation of the preset host is determined to be completed.
4. The battery cluster parallel method according to claim 2, further comprising, in the case where it is determined that there are other battery clusters that have closed the main loop relay in the battery cluster:
executing self-checking operation of a preset slave;
after the self-checking operation of the preset slave machine is finished, judging whether an operation command is received or judging whether the host machine is in an operation mode; the host is a CMU in a battery cluster of the first closed main loop relay;
and if the operation command is received or the host is in the operation mode, carrying out the pre-charging operation on the battery cluster to be connected in parallel, and determining that the battery cluster to be connected in parallel successfully executes the preset parallel basic operation after the pre-charging operation is finished.
5. The method of claim 4, wherein performing a preset slave self-test operation comprises:
judging whether a preset fault exists, whether a shutdown command is received or not, and whether the host is not in a startup state or not;
and under the conditions that the preset fault does not exist, the shutdown command is not received and the host is not in a startup state, determining that the self-checking operation of the preset slave is finished.
6. The battery cluster parallel connection method according to claim 1, further comprising, in the case where a difference between the voltage of the battery cluster to be connected in parallel and the parallel voltage is not within a preset difference range:
after a preset time interval, the step of acquiring the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation is performed back.
7. A battery cluster parallel arrangement for use in a CMU in a battery cluster to be connected in parallel, the battery cluster parallel arrangement comprising:
the voltage acquisition module is used for acquiring the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation under the condition that the battery cluster to be connected in parallel successfully executes the preset parallel basic operation;
the judging module is used for judging whether the difference value between the voltage of the battery cluster to be connected in parallel and the parallel voltage is within a preset difference value range;
the relay closing module is used for closing a preset main loop relay of the battery cluster to be connected in parallel if yes;
the method for obtaining the voltage of the battery cluster to be connected in parallel and the parallel voltage of the battery cluster subjected to parallel operation comprises the following steps:
and acquiring the voltage of the battery cluster to be connected in parallel and the terminal voltage of the PCS system, which are obtained by sampling by the voltage sampling circuit of the battery cluster to be connected in parallel, and taking the terminal voltage of the PCS system as the parallel voltage.
8. A storage medium comprising a stored program, wherein the program performs the battery cluster parallel method of any one of claims 1 to 6.
9. A CMU comprising: a memory and a processor;
wherein the memory is used for storing programs;
the processor invokes a program and is configured to execute the battery cluster parallel method according to any one of claims 1 to 6.
CN202110566862.0A 2021-05-24 2021-05-24 Battery cluster parallel connection method and related device Active CN113285507B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110566862.0A CN113285507B (en) 2021-05-24 2021-05-24 Battery cluster parallel connection method and related device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110566862.0A CN113285507B (en) 2021-05-24 2021-05-24 Battery cluster parallel connection method and related device

Publications (2)

Publication Number Publication Date
CN113285507A CN113285507A (en) 2021-08-20
CN113285507B true CN113285507B (en) 2024-04-12

Family

ID=77281092

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110566862.0A Active CN113285507B (en) 2021-05-24 2021-05-24 Battery cluster parallel connection method and related device

Country Status (1)

Country Link
CN (1) CN113285507B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115001070B (en) * 2022-05-17 2024-03-22 珠海科创储能科技有限公司 Energy management system of single PCS sharing multi-battery cluster

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016147307A1 (en) * 2015-03-16 2016-09-22 株式会社東芝 Storage battery management device, method, and program
CN108336783A (en) * 2018-02-05 2018-07-27 北京海博思创科技有限公司 The control method of voltage difference between energy-storage system and battery cluster
CN108599212A (en) * 2018-04-12 2018-09-28 浙江正泰电器股份有限公司 Energy-storage system
CN109742831A (en) * 2019-03-19 2019-05-10 莱克电气股份有限公司 A kind of master-slave mode battery control system and method
CN109904907A (en) * 2019-03-28 2019-06-18 杭州微慕科技有限公司 Batteries in parallel connection cluster powers on system and method
CN110265976A (en) * 2019-06-20 2019-09-20 阳光电源股份有限公司 A kind of the linkage protection circuit and battery energy storage system of battery energy storage system
CN111431231A (en) * 2020-03-31 2020-07-17 清华大学 Battery grouping framework based on flexible connection and redundancy
CN112467239A (en) * 2020-12-01 2021-03-09 北京海博思创科技股份有限公司 Battery management device, energy storage equipment and communication method
WO2021051366A1 (en) * 2019-09-18 2021-03-25 南京恒天领锐汽车有限公司 Dual-source control system and control method therefor, and electric vehicle
KR20210044026A (en) * 2019-10-14 2021-04-22 주식회사 엘지화학 Energy Circuit Control System in Parallel Battery Packs using Bi-stable Relay Comprising the Same and the Control Method Thereof

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016147307A1 (en) * 2015-03-16 2016-09-22 株式会社東芝 Storage battery management device, method, and program
CN108336783A (en) * 2018-02-05 2018-07-27 北京海博思创科技有限公司 The control method of voltage difference between energy-storage system and battery cluster
CN108599212A (en) * 2018-04-12 2018-09-28 浙江正泰电器股份有限公司 Energy-storage system
CN109742831A (en) * 2019-03-19 2019-05-10 莱克电气股份有限公司 A kind of master-slave mode battery control system and method
CN109904907A (en) * 2019-03-28 2019-06-18 杭州微慕科技有限公司 Batteries in parallel connection cluster powers on system and method
CN110265976A (en) * 2019-06-20 2019-09-20 阳光电源股份有限公司 A kind of the linkage protection circuit and battery energy storage system of battery energy storage system
WO2021051366A1 (en) * 2019-09-18 2021-03-25 南京恒天领锐汽车有限公司 Dual-source control system and control method therefor, and electric vehicle
KR20210044026A (en) * 2019-10-14 2021-04-22 주식회사 엘지화학 Energy Circuit Control System in Parallel Battery Packs using Bi-stable Relay Comprising the Same and the Control Method Thereof
CN111431231A (en) * 2020-03-31 2020-07-17 清华大学 Battery grouping framework based on flexible connection and redundancy
CN112467239A (en) * 2020-12-01 2021-03-09 北京海博思创科技股份有限公司 Battery management device, energy storage equipment and communication method

Also Published As

Publication number Publication date
CN113285507A (en) 2021-08-20

Similar Documents

Publication Publication Date Title
US10008853B2 (en) Generator dispatching or load shedding control method and system for microgrid applications
CN104216499B (en) Rack and its power control method
EP4290726A1 (en) Off-grid start method and system for new energy power generation system
KR102659479B1 (en) Parallel battery pack charging and discharging management methods, electronics and electrical systems
JP6395849B2 (en) Device and method for wiring a battery management system
KR20150019902A (en) Battery system, method for controlling battery system and energy storage system including the same
CN113285507B (en) Battery cluster parallel connection method and related device
CN115085387A (en) Controller for energy storage, system comprising the controller and method of use thereof
CN115441487A (en) SOC (system on chip) balancing method and terminal of common DC bus energy storage system
CN115411809A (en) Energy storage system and power supply control method of battery management system
JP6163445B2 (en) Power interchange system and power interchange method
CN116387655B (en) Household intelligent control system based on CAN bus and daisy chain communication
CN114243789B (en) Micro-grid control method and device, micro-grid main controller and storage medium
CN116316939A (en) Power supply system, power supply circuit and control method thereof
CN107017683B (en) Balance and self-repair control method for storage battery of transformer substation
CN111937269A (en) Power storage system and charge control method
CN112117504A (en) Control method of power battery, energy storage system, electronic device and storage medium
CN117353432B (en) Electric quantity equalization circuit, method and device, storage medium and electronic equipment
CN216290317U (en) Power supply system
CN113093035B (en) Method for determining number of battery modules and related device
KR101833321B1 (en) Automatic control method of plural energy storage systems in closed network
CN116466637B (en) Power distribution control system and method of aircraft and flight control computer
CN212342707U (en) Automatic addressing system for battery module and battery module thereof
KR102583291B1 (en) battery auto balancing device and method for energy storage system
JP6251608B2 (en) Power interchange system and power interchange method

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
GR01 Patent grant
GR01 Patent grant