CN112260719A - Frequency hopping communication method for wireless battery management and system applying same - Google Patents
Frequency hopping communication method for wireless battery management and system applying same Download PDFInfo
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- CN112260719A CN112260719A CN202010469530.6A CN202010469530A CN112260719A CN 112260719 A CN112260719 A CN 112260719A CN 202010469530 A CN202010469530 A CN 202010469530A CN 112260719 A CN112260719 A CN 112260719A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7156—Arrangements for sequence synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7152—Interference-related aspects with means for suppressing interference
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Abstract
The invention relates to the field of battery management, and an embodiment of the invention provides a frequency hopping communication method for wireless battery management, which comprises the following steps: determining a frequency hopping frequency set; synchronizing the frequency hopping frequency set to a battery management system needing frequency hopping communication; the battery management system establishes a communication link for data transmission by adopting the frequency in the frequency hopping frequency set and monitors whether the communication link is normal or not; if the frequency hopping information is normal, transmitting a control signal containing frequency hopping information through the communication link; if the communication link is abnormal, the battery management systems on the two sides of the communication link try to rebuild the communication link through preset frequency hopping information; wherein the frequency hopping information comprises frequency hopping time and frequency after frequency hopping. Meanwhile, a battery management system and a wireless battery management system applying the frequency hopping communication method are also provided. The implementation mode provided by the invention improves the anti-interference capability of the wireless battery management system during wireless communication.
Description
Technical Field
The present invention relates to the field of battery management, and in particular, to a frequency hopping communication method for wireless battery management, a battery management system using the frequency hopping communication method, and a wireless battery management system.
Background
A Battery Management System (BMS), which is a core component of a battery system, manages a battery, dynamically detects voltage, current, temperature, insulation resistance, etc. of the battery, and performs state estimation, battery equalization management, thermal management, contactor control, fault diagnosis and alarm according to detection data; the wireless communication is one of the future development directions of the battery management system, and the acquired battery data is transmitted in a wireless communication mode, so that the battery management system is free of physical wiring harness connection and is easy to maintain and install. The wireless battery management system is structured as follows: a wireless battery management system comprises a master control BMS and a plurality of slave control BMSs, wherein the slave control BMSs are connected with a battery through a collection wire harness and used for collecting battery voltage and temperature data, wireless communication is adopted between the master control BMS and the slave control BMSs, and the slave control BMSs transmit the collected data to the master control BMS in a wireless mode.
The wireless communication of the battery management system basically adopts a fixed frequency communication mode, the wireless communication is easily interfered by external environment and frequency, and if the frequency of an interference signal in the environment is overlapped with the fixed frequency adopted by the battery management system, the signal output of the battery management system can be influenced, and even the normal communication cannot be caused.
Disclosure of Invention
In view of the above, the present invention is directed to a frequency hopping communication method for wireless battery management and a system using the same, so as to at least solve the problem that a fixed frequency in a wireless battery management system is prone to interference.
In a first aspect of the present invention, there is provided a frequency hopping communication method for wireless battery management, the method comprising:
determining a frequency hopping frequency set; synchronizing the frequency hopping frequency set to a battery management system needing frequency hopping communication; the battery management system establishes a communication link for data transmission by adopting the frequency in the frequency hopping frequency set and monitors whether the communication link is normal or not; if the frequency hopping information is normal, transmitting a control signal containing frequency hopping information through the communication link; if the communication link is abnormal, the battery management systems on the two sides of the communication link try to rebuild the communication link through preset frequency hopping information; wherein the frequency hopping information comprises frequency hopping time and frequency after frequency hopping.
Optionally, the determining a set of hopping frequencies includes: determining an alternative frequency set according to the communication bandwidth and the frequency interval; acquiring interference information on each frequency in the alternative frequency set; and selecting the frequencies with the interference information smaller than a set interference threshold value to form the frequency hopping frequency set.
Optionally, the synchronizing the frequency hopping frequency set to the BMS that needs frequency hopping communication includes:
and adopting a preset first frequency as a synchronous channel, and sending the frequency hopping frequency set to a battery management system needing frequency hopping communication on the synchronous channel in a broadcasting mode.
Optionally, a preset second frequency is used as a standby synchronization channel of the synchronization channel, where the standby synchronization channel is used to be enabled when the synchronization channel cannot complete networking configuration.
Optionally, the control signal including the frequency hopping information includes: a time stamp for determining time synchronization of BMSs on both sides of the communication link; the frequency hopping time is used for determining the frequency hopping time; and a hopping frequency for determining a frequency after hopping.
Optionally, the preset frequency hopping information includes: presetting frequency hopping time which is preset duration after the moment of successful communication of the last time; and presetting the frequency after frequency hopping, which is the next frequency of the frequency used by the current communication link according to the sequence in the frequency hopping frequency set.
Optionally, the method further includes: when the attempt to reestablish the communication link fails, selecting to generate an alarm or try to reestablish again; the reattempting to reconstruct includes: attempting a reestablishment of the communication link using a next frequency of the next frequency in order in the set of hopping frequencies.
In a second aspect of the present invention, there is also provided a battery management system applying a frequency hopping communication method, the battery management system being configured as a master, including:
after power-on initialization, determining a frequency hopping frequency set; transmitting the set of frequency hopping frequencies on a synchronization channel; transmitting a control signal for providing time synchronization and frequency hopping information; and when the communication link is monitored to be abnormal, trying to reestablish the communication link through preset frequency hopping information.
In a third aspect of the present invention, there is also provided a battery management system applying a frequency hopping communication method, the battery management system being configured as a slave, including:
receiving a set of frequency hopping frequencies on a synchronization channel; receiving a control signal, and performing time synchronization and frequency hopping according to the control signal; and when the communication link is monitored to be abnormal, trying to reestablish the communication link through preset frequency hopping information.
In a fourth aspect of the present invention, there is also provided a wireless battery management communication system comprising: the aforementioned master control terminal and at least one of the aforementioned slave control terminals.
In a fifth aspect of the present invention, there is also provided a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to execute the aforementioned frequency hopping communication method for wireless battery management.
Through the technical scheme provided by the invention, the following beneficial effects are achieved: the frequency hopping communication method for wireless battery management provided by the invention enables the battery management system to communicate on a plurality of frequency bands, avoids the problem that the battery management system cannot work after a certain fixed frequency band is interfered, and improves the anti-interference performance and the stability of the system.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a flow chart illustrating a frequency hopping communication method for wireless battery management according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wireless battery management system according to an embodiment of the present invention;
fig. 3 is a flowchart of an implementation of a frequency hopping communication method for wireless battery management according to an embodiment of the present invention.
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart illustrating a frequency hopping communication method for wireless battery management according to an embodiment of the present invention, as shown in fig. 1. A wireless battery managed frequency hopping communication method, the method comprising:
determining a frequency hopping frequency set; synchronizing the frequency hopping frequency set to a battery management system needing frequency hopping communication; the battery management system establishes a communication link for data transmission by adopting the frequency in the frequency hopping frequency set and monitors whether the communication link is normal or not; if the frequency hopping information is normal, transmitting a control signal containing frequency hopping information through the communication link; if the communication link is abnormal, the battery management systems on the two sides of the communication link try to rebuild the communication link through preset frequency hopping information; wherein the frequency hopping information comprises frequency hopping time and frequency after frequency hopping.
Therefore, the confidentiality and the anti-interference performance in the conventional wireless battery management communication can be improved. Specifically, a frequency hopping frequency set is determined first, where the determination includes artificial selection determination, or determination according to a communication mode, or determination according to an actual scene, or determination according to an effect to be achieved. And then distributing the frequency hopping frequency set to a battery management system needing frequency hopping communication through a synchronous handshake, so that each battery management system participating in frequency hopping communication stores the frequency hopping frequency set, and when communication negotiation cannot be carried out, the two battery management systems have the same frequency so as to establish a new communication link. And the battery management system adopts the frequencies in the frequency hopping frequency set to establish a communication link, and the communication link is mainly used for data transmission of the battery management system. If the communication link is normal, in order to realize the confidentiality of communication, an active frequency hopping mechanism is implemented, and frequency hopping is implemented by a control signal in the communication link. The control signal is sent to the slave control end of the battery management system by the master control end of the battery management system, and the master control end and the slave control end of the battery management system hop to another communication frequency in the negotiated frequency hopping frequency set according to the frequency hopping information in the control signal at the same time, so that frequency hopping is realized, and the smoothness of a communication link is kept. If the communication link is abnormal, where the abnormality includes detecting that an interfering signal exceeds a threshold, or that no communication data or heartbeat signal has been received for a period of time, then passive frequency hopping is implemented. The battery management system main control end and the slave control end try to rebuild the communication link by adopting other communication frequencies in the frequency hopping frequency set in a pre-negotiated time selection mode and frequency selection mode so as to avoid interference or faults on the original communication link.
In an embodiment of the present invention, the determining the set of hopping frequencies includes: determining an alternative frequency set according to the communication bandwidth and the frequency interval; acquiring interference information on each frequency in the alternative frequency set; and selecting the frequencies with the interference information smaller than a set interference threshold value to form the frequency hopping frequency set. Communication bandwidths of different communication modes are different, and therefore channels of the communication modes are also different, so that an alternative frequency set needs to be determined according to the communication modes and an actual scene, the alternative frequency set comprises a plurality of communication frequencies, and the communication frequencies are also called frequency points or channels. In excluding unusable communication frequencies from the set of alternative frequencies, the present embodiment excludes by measuring the interfering signal strength. And after the communication frequency with larger interference signal is eliminated, obtaining a frequency hopping frequency set. The frequencies used for the establishment of the communication link are each selected from the set of hopping frequencies. In the communication of the wireless battery management system, considering that the main interference in the environment is W-LAN, the bandwidth range of the W-LAN is 22Mhz, the frequency set is designed mainly to avoid the interference caused by the W-LAN, therefore, the interval of adjacent frequency hopping bands is designed to be larger than 22MHz, the initial frequency hopping frequency set is shown in the following table, and the total frequency channels are 38.
The initial frequency hopping frequency set is stored in the equipment, the equipment detects the signal intensity of each channel in the frequency hopping frequency set in sequence after power-on initialization, the hopping period is 1ms, if the signal intensity of a certain channel is > -80dbm, the channel is considered to have interference, the channel is removed from the initial frequency hopping frequency set, the interference channel is eliminated through scanning of each frequency channel in the initial frequency hopping frequency set by the master control BMS, and the final frequency hopping frequency set is determined.
In an embodiment of the present invention, the synchronizing the frequency hopping frequency set to the BMS that needs frequency hopping communication includes: and adopting a preset first frequency as a synchronous channel, and sending the frequency hopping frequency set to a battery management system needing frequency hopping communication on the synchronous channel in a broadcasting mode. The wireless battery management system takes a 2466MHz frequency channel as a synchronous channel, the master control BMS sends a frequency hopping frequency set to each slave control BMS in a broadcast mode on the channel, each slave control BMS immediately jumps to a first channel in the frequency hopping frequency set after receiving the frequency hopping frequency set, waits for communication with the master control BMS, and completes networking configuration.
In the former embodiment, a single synchronization channel may not complete the foregoing networking configuration due to interference or the like, and to avoid this situation, this embodiment sets a backup synchronization channel, that is, a preset second frequency is adopted as a backup synchronization channel of the synchronization channel, where the backup synchronization channel is used to be activated when the synchronization channel cannot complete the networking configuration. And setting a redundant channel 2444MHz as a standby synchronous channel, and when the networking configuration cannot be completed on the 2466MHz frequency channel, jumping to the 2444MHz frequency channel by the master control BMS and the slave control BMS to complete the networking configuration.
In one embodiment of the present invention, the control signal including frequency hopping information includes: a time stamp for determining time synchronization of BMSs on both sides of the communication link; the frequency hopping time is used for determining the frequency hopping time; and a hopping frequency for determining a frequency after hopping. The timer is started to time after the master control BMS and the slave control BMS hop frequency each time, the master control BMS fills a timestamp, frequency hopping time information and the next channel frequency into a communication protocol and sends the information to each slave control BMS, and after the slave control BMS receives the synchronous information, the time of the slave control BMS is adjusted through the timestamp, so that the time consistency is realized, and the purpose of synchronization is achieved. And feeding back data to the master control BMS according to the command requirement, and synchronously jumping to the next channel frequency by the master control BMS and the slave control BMS according to the appointed frequency hopping time.
In an embodiment provided by the present invention, the preset frequency hopping information includes: presetting frequency hopping time which is preset duration after the moment of successful communication of the last time; and presetting the frequency after frequency hopping, which is the next frequency of the frequency used by the current communication link according to the sequence in the frequency hopping frequency set. And if the master control BMS and the slave control BMS do not receive data in 3 continuous communication periods, judging that the channel (communication link) is interfered, and jumping to the next channel according to the current frequency according to the frequency hopping frequency set by the master control BMS and the slave control BMS, waiting for resynchronization and communicating, and if the communication is successful, normally executing according to a synchronous frequency hopping flow.
In one embodiment provided by the present invention, the method further comprises: when the attempt to reestablish the communication link fails, selecting to generate an alarm or try to reestablish again; the reattempting to reconstruct includes: attempting a reestablishment of the communication link using a next frequency of the next frequency in order in the set of hopping frequencies. In the above embodiment, if no data is received in 3 consecutive communication cycles, which indicates that the above-mentioned reestablishment is not successful or that the reestablished communication link still has interference, the system continues to jump to the next channel according to the frequency hopping set until synchronization is established or the system is down in alarm, where the number of reestablishment attempts may be preset.
In an embodiment provided by the present invention, a battery management system applying a frequency hopping communication method is configured as a main control end: after power-on initialization, determining a frequency hopping frequency set; transmitting the set of frequency hopping frequencies on a synchronization channel; transmitting a control signal for providing time synchronization and frequency hopping information; and when the communication link is monitored to be abnormal, trying to reestablish the communication link through preset frequency hopping information. Or a battery management system applying a frequency hopping communication method, the battery management system being configured to the slave: receiving a set of frequency hopping frequencies on a synchronization channel; receiving a control signal, and performing time synchronization and frequency hopping according to the control signal; and when the communication link is monitored to be abnormal, trying to reestablish the communication link through preset frequency hopping information.
The above battery management system is configured as a master or a slave, and may be implemented by setting a flag in a communication procedure, where the difference between the two is only in determining the function distribution of the frequency hopping frequency set and the transceiving directions of the frequency hopping frequency set and the control signal.
Fig. 2 is a schematic structural diagram of a wireless battery management system according to an embodiment of the present invention, as shown in fig. 2. In one embodiment provided by the present invention, there is provided a wireless battery management system including: the master control terminal (master control BMS) and the at least one slave control terminal (slave control BMS) adopt wireless transmission, and the networking architecture is shown in fig. 2, wherein the master control BMS and the slave control BMSs adopt the frequency hopping communication method through the configuration, so that the method has the advantage of good anti-interference performance, and the number of the slave control BMSs shown in the figure is not limited.
Fig. 3 is a flowchart of an implementation of a frequency hopping communication method for wireless battery management according to an embodiment of the present invention, as shown in fig. 3. The method mainly comprises the steps of frequency design, quality evaluation, synchronous handshake, network configuration, frequency hopping communication and the like, and the implementation details are as described above. The embodiment of the invention provides a frequency hopping communication method for a wireless battery management system, aiming at the problem that the fixed frequency wireless communication of the battery management system is easily interfered by the external environment. The embodiment provided by the invention is applied to a wireless battery management system.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that 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 the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method of frequency hopping communication for wireless battery management, the method comprising:
determining a frequency hopping frequency set;
synchronizing the frequency hopping frequency set to a battery management system needing frequency hopping communication;
the battery management system establishes a communication link for data transmission by adopting the frequency in the frequency hopping frequency set and monitors whether the communication link is normal or not;
if the frequency hopping information is normal, transmitting a control signal containing frequency hopping information through the communication link;
if the communication link is abnormal, the battery management systems on the two sides of the communication link try to rebuild the communication link through preset frequency hopping information;
wherein the frequency hopping information comprises frequency hopping time and frequency after frequency hopping.
2. The method of claim 1, wherein the determining the set of hopping frequencies comprises:
determining an alternative frequency set according to the communication bandwidth and the frequency interval;
acquiring interference information on each frequency in the alternative frequency set;
and selecting the frequencies with the interference information smaller than a set interference threshold value to form the frequency hopping frequency set.
3. The method of claim 1, wherein synchronizing the set of frequency hopping frequencies to a battery management system requiring frequency hopping communications comprises:
and adopting a preset first frequency as a synchronous channel, and sending the frequency hopping frequency set to a battery management system needing frequency hopping communication on the synchronous channel in a broadcasting mode.
4. The method of claim 3, wherein a preset second frequency is used as a backup synchronization channel of the synchronization channel, and the backup synchronization channel is used for being enabled when the synchronization channel cannot complete the networking configuration.
5. The method of claim 1, wherein the control signal containing frequency hopping information comprises:
the time stamp is used for determining the time synchronization of the battery management systems on two sides of the communication link;
the frequency hopping time is used for determining the frequency hopping time; and
and the frequency hopping frequency is used for determining the frequency after frequency hopping.
6. The method of claim 1, wherein the preset frequency hopping information comprises:
presetting frequency hopping time which is preset duration after the moment of successful communication of the last time; and
and presetting the frequency after frequency hopping, which is the next frequency of the frequency used by the current communication link according to the sequence in the frequency hopping frequency set.
7. The method of claim 6, further comprising: when the attempt to reestablish the communication link fails, selecting to generate an alarm or try to reestablish again;
the reattempting to reconstruct includes: attempting a re-reestablishment of the communication link using a frequency next to the frequency used to reestablish the communication link, in order in the set of frequency hopping frequencies.
8. A battery management system applying a frequency hopping communication method, wherein the battery management system is configured as a master, and comprises:
after power-on initialization, determining a frequency hopping frequency set;
transmitting the set of frequency hopping frequencies on a synchronization channel;
transmitting a control signal for providing time synchronization and frequency hopping information; and
and when the communication link is monitored to be abnormal, attempting to reestablish the communication link through preset frequency hopping information.
9. A battery management system applying a frequency hopping communication method, wherein the battery management system is configured as a slave, and comprises:
receiving a set of frequency hopping frequencies on a synchronization channel;
receiving a control signal, and performing time synchronization and frequency hopping according to the control signal; and
and when the communication link is monitored to be abnormal, attempting to reestablish the communication link through preset frequency hopping information.
10. A wireless battery management system, the system comprising: the master according to claim 8 and at least one slave according to claim 9.
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| CN116436550A (en) * | 2023-06-12 | 2023-07-14 | 苏州精控能源科技有限公司 | Wireless monitoring method, system, equipment and medium for energy storage system in complex environment |
| CN117533195A (en) * | 2024-01-10 | 2024-02-09 | 北京航空航天大学 | Power battery management method based on active impedance test |
| CN117533195B (en) * | 2024-01-10 | 2024-04-05 | 北京航空航天大学 | Power battery management method based on active impedance test |
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