CN112583684A - Distributed battery management system and communication method and device in system - Google Patents
Distributed battery management system and communication method and device in system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0677—Localisation of faults
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Abstract
The invention provides a distributed battery management system and a communication method and a device in the system, wherein the distributed battery management system comprises: the system comprises a main control unit and at least two battery monitoring units; the at least two battery monitoring units are connected in series to form a series branch; the main control unit is provided with two communication interfaces, wherein one communication interface is connected with the first battery monitoring unit positioned at the head part in the serial branch, and the other communication interface is connected with the last battery monitoring unit positioned at the tail part in the serial branch; the method comprises the following steps: determining a communication interface in an idle state on the main control unit in a previous communication period, and recording the communication interface as a target communication interface; and the target communication interface of the main control unit is used as the communication interface for communicating with the battery monitoring unit at this time, so that the difference of consistency among the battery modules is reduced.
Description
Technical Field
The invention relates to the technical field of battery monitoring, in particular to a distributed battery management system and a communication method and device in the system.
Background
In the design of the distributed battery management system, referring to fig. 1, unidirectional daisy chain communication is commonly adopted between the battery monitoring units (CMUs), i.e. the master control unit (BMU) transmits information to the lowest-order battery monitoring unit, for example, CMU1, and then CMU1 transmits information to CMU2, and then goes up to the highest-order CMUn; when the battery monitoring unit transmits the information back to the main control unit, the path is reversed, the CMUn transmits the information to the CMUn-1, and the CMU1 transmits all the CMU information to the main control unit in sequence.
The one-way daisy chain communication has two disadvantages: first, when a daisy chain harness between CMUs is disconnected or failed, for example, if 10 CMU cells are provided and the daisy chain harness is disconnected between CMU4 and CMU5, all CMUs communication from CMU5 to the top is disconnected; secondly, in the unidirectional daisy chain communication, when the CMUs return the data of the battery information to the BMU, the data volume transmitted by each CMU is different, the highest CMU only transmits the battery information monitored by itself, each CMU in the downward direction not only transmits the battery information of itself, but also transmits the battery information transmitted by the CMU in the upper layer, taking the lowest CMU as an example, the CMU transmits the data of all the battery information to the BMU, the difference of the data volume can be finally embodied in the power consumption difference of the CMUs, the CMUs with large transmitted data volume inevitably has larger power consumption, and the CMUs generally directly take power from the battery modules monitored by the CMUs, so the power consumption difference of each battery module can be caused, and finally the consistency difference between the battery modules can be caused.
Disclosure of Invention
In view of this, embodiments of the present invention provide a distributed battery management system, and a communication method and device in the system, so as to reduce a difference in consistency between battery modules corresponding to each battery monitoring unit in the distributed battery management system.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
an internal communication method of a distributed battery management system, for implementing internal communication in the distributed battery management system, the distributed battery management system comprising:
the system comprises a main control unit and at least two battery monitoring units;
the at least two battery monitoring units are connected in series to form a series branch;
the main control unit is provided with two communication interfaces, wherein one communication interface is connected with the first battery monitoring unit positioned at the head part in the serial branch, and the other communication interface is connected with the last battery monitoring unit positioned at the tail part in the serial branch;
the method comprises the following steps:
determining a communication interface in an idle state on the main control unit in a previous communication period, and recording the communication interface as a target communication interface;
and adopting the target communication interface of the main control unit as a communication interface for communicating with the battery monitoring unit at this time.
Optionally, the internal communication method of the distributed battery management system further includes:
when the series branch is detected to be broken, merging data acquired in two adjacent communication periods after the broken circuit occurs to serve as communication data in one communication period;
or, when detecting that the series branch is broken, in the same communication period, the main control unit adopts two communication interfaces to communicate with the battery monitoring unit respectively, and combines data acquired by the two communication interfaces to serve as communication data in one communication period.
Optionally, the internal communication method of the distributed battery management system further includes:
the method comprises the steps of obtaining a data volume obtained by a current communication interface of a main control unit, recording the data volume as a first data volume, judging whether the first data volume is a preset value or not, and generating a circuit breaking signal for representing that circuit breaking occurs in a series branch when the first data volume is not the preset value.
Optionally, the internal communication method of the distributed battery management system further includes:
acquiring a data volume acquired by a current communication interface of a main control unit, recording the data volume as a first data volume, and judging whether the first data volume is a preset value or not;
when the first data volume is smaller than a preset value, acquiring the data volume acquired by the main control unit from a next communication interface in a next communication period, and recording the data volume as a second data volume;
calculating a difference between the first data volume and the second data volume;
and outputting circuit breaking warning information which is matched with the difference and used for representing the circuit breaking position.
An internal communication device of a distributed battery management system is applied to a main control unit, wherein the main control unit is provided with two communication interfaces, one communication interface is connected with a first battery monitoring unit positioned at the head part in a serial branch, and the other communication interface is connected with a last battery monitoring unit positioned at the tail part in the serial branch; the series branch is formed by sequentially connecting N battery monitoring units in series;
the device comprises:
the communication interface selection unit is used for acquiring a communication interface in an idle state on the main control unit in the last communication cycle and recording the communication interface as a target communication interface; and adopting the target communication interface of the main control unit as a communication interface for communicating with the battery monitoring unit at this time.
Optionally, the internal communication device of the distributed battery management system further includes:
the circuit breaking detection unit is used for detecting whether a circuit breaking fault occurs in the series branch circuit;
the data integration unit is used for merging the data acquired in two adjacent communication periods after the circuit break occurs when the circuit break detection unit detects that the circuit break fault occurs in the serial branch and using the merged data as the communication data in one communication period; or, the main control unit is configured to, when it is detected that the series branch is disconnected, in the same communication cycle, adopt two communication interfaces to communicate with the battery monitoring unit, respectively, and merge data acquired by the two communication interfaces to serve as communication data in one communication cycle.
Optionally, in the internal communication device of the distributed battery management system, the disconnection detecting unit is specifically configured to:
the method comprises the steps of obtaining a data volume obtained by a current communication interface of a main control unit, recording the data volume as a first data volume, judging whether the first data volume is a preset value or not, and outputting a trigger signal for representing that a series branch circuit has an open circuit fault to a data integration unit when the first data volume is smaller than the preset value.
Optionally, the internal communication device of the distributed battery management system further includes:
the circuit breaking positioning unit is used for acquiring the data volume acquired by the main control unit from the next communication interface in the next communication period and recording the data volume as a second data volume when the circuit breaking detection unit detects that a circuit breaking fault occurs in the serial branch; calculating a difference between the first data volume and the second data volume; and outputting circuit breaking warning information which is matched with the difference and used for representing the circuit breaking position.
A distributed battery management system, comprising:
the system comprises a main control unit and at least two battery monitoring units;
the at least two battery monitoring units are connected in series to form a series branch,
the main control unit is provided with two communication interfaces, wherein one communication interface is connected with the first battery monitoring unit positioned at the head part in the serial branch, and the other communication interface is connected with the last battery monitoring unit positioned at the tail part in the serial branch;
the main control unit is applied with a daisy chain communication device of the battery monitoring unit.
Optionally, in the distributed battery management system, the number of the battery monitoring units is 4.
According to the scheme, in the internal communication method of the distributed battery management system disclosed by the embodiment of the application, two communication paths are arranged in the distributed battery management system, the communication paths selected in each communication period are different, and the problem of inconsistent power consumption of the battery modules corresponding to each battery monitoring unit in the distributed battery management system is solved through the interactive use mode of the two communication paths, so that the difference of consistency among the battery modules is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a distributed battery management system in the prior art;
fig. 2 is a schematic structural diagram of a distributed battery management system disclosed in an embodiment of the present application;
fig. 3 is a schematic flowchart of an internal communication method of a distributed battery management system according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating a method for locating a series branch open-circuit fault in a distributed battery management system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the problem that in the topology structure of the ring-shaped battery monitoring unit in the prior art, the power consumption of the battery modules corresponding to each battery monitoring is inconsistent, which causes differences in consistency among the battery modules, the application discloses an internal communication method of a distributed battery management system, which is applied to a main control unit in the distributed battery management system and is used for realizing internal communication in the distributed battery management system, and referring to fig. 2, the distributed battery management system includes:
the system comprises a main control unit BMU and at least two cell monitoring units CMUs (the CMUs 1, 2, 3 and 4 in the drawing refer to different cell monitoring units respectively), wherein the number of the CMUs can be set according to user requirements, the number of the CMUs in the drawing provided by the application is only an example, the cell monitoring units are the CMUs of a distributed cell management system, the main control unit is the BMU of the distributed cell management system, and the main control unit is used for digitally displaying data analysis and processing in the distributed cell management system;
referring to fig. 2, the at least two battery monitoring units are connected in series to form a series branch, that is, each battery monitoring unit in the present embodiment has two communication interfaces (a first communication interface and a second communication interface), in the distributed battery management system, a second communication interface of a first battery monitoring unit is connected with a first communication interface of a second battery monitoring unit, a second communication interface of the second battery monitoring unit is connected with a first communication interface of a third battery monitoring unit, a second communication interface of the third battery monitoring unit is connected with a first communication interface of a fourth battery monitoring unit … …, a second communication interface of an Nth-1 battery monitoring unit is connected with a first communication interface of the Nth battery monitoring unit, and the first battery monitoring unit and the Nth battery monitoring unit form a series branch, wherein N is used to characterize the number of battery monitoring units in the distributed battery management system.
The main control unit is provided with two communication interfaces, wherein one communication interface (which can be marked as a first communication interface) is connected with a first battery monitoring unit (a first battery monitoring unit) positioned at the head part in the serial branch, and is specifically connected with the first communication interface of the battery monitoring unit, and the other communication interface is connected with a last battery monitoring unit (an Nth battery monitoring unit) positioned at the tail part in the serial branch, and is specifically connected with a second communication interface of the battery monitoring unit;
referring to fig. 3, the method may specifically include:
step S301: determining a communication interface in an idle state on the main control unit in a previous communication period, and recording the communication interface as a target communication interface;
in the technical scheme disclosed in the embodiment of the application, when the main control unit communicates each time, idle states of a first communication interface and a second communication interface of the main control unit are monitored, a communication interface which does not perform data interaction in each communication period is marked as an idle state, and the other communication interface which performs data interaction is marked as an occupied state; in order to facilitate the rapid determination of the communication interface in the next communication period, after the previous communication period is finished, the communication interface marked as an idle state in the previous communication period is directly used as a target communication interface;
assuming that the first communication interface of the main control unit is an occupied communication interface in the previous period, at this time, since the first communication interface of the main control unit is connected to the first communication interface of the first battery monitoring unit, the internal communication path of the distributed battery management system is as follows: the main control unit-the first battery monitoring unit-the second battery monitoring unit- … … -the nth-1 battery monitoring unit-the nth-1 battery monitoring unit- … … -the second battery monitoring unit-the first battery monitoring unit-the main control unit.
Step S302: when the communication period is monitored to come, the target communication interface of the main control unit is adopted as a communication interface for communicating with the battery monitoring unit at this time;
in this step, when a communication cycle arrives, the target communication interface determined in step S301 is used as a communication interface for communicating with the battery monitoring unit, and at this time, the target communication interface is marked as an occupied state, and the other communication interface is marked as an idle state, so that when the next communication cycle arrives, the other communication interface is used for communication;
step S303: performing data communication with the battery detection by adopting the target communication interface;
assuming that the target communication interface is the second communication interface of the main control unit, at this time, since the second communication interface of the main control unit is connected to the second communication interface of the nth battery monitoring unit, the internal communication path of the distributed battery management system is as follows: the main control unit-the Nth battery monitoring unit-the Nth-1 battery monitoring unit- … … -the second battery monitoring unit-the first battery monitoring unit-the second battery monitoring unit- … … -the Nth-1 battery monitoring unit-the Nth battery monitoring unit-the main control unit.
As can be seen from the above solutions, in the internal communication method of the distributed battery management system disclosed in the embodiment of the present application, two communication paths are provided inside the distributed battery management system, and the communication paths selected in each communication period are different, so that the problem of inconsistent power consumption of the battery modules corresponding to each battery monitoring unit in the distributed battery management system is reduced in a manner that the two communication paths are used alternately, and the difference in consistency between the battery modules is reduced.
Further, for various reasons, a disconnection condition may occur in the series branch formed by the battery monitoring units in the distributed battery management system, that is, a line between two adjacent battery monitoring units is disconnected or a certain battery monitoring unit stops operating. In the technical solution disclosed in the embodiment of the present application, in order to solve the problem that when an open circuit condition occurs in a serial branch, a master control unit cannot acquire a condition of a working condition of a battery monitoring unit after a circuit breaking node, the method disclosed in the embodiment of the present application may further include:
when the series branch is detected to be broken, merging the data acquired in two adjacent communication periods after the broken circuit occurs to serve as the communication data in one communication period;
specifically, when data merging is performed, when it is detected that an open circuit occurs in the serial branch, a communication cycle in which the open circuit occurs is marked and recorded as an open circuit cycle, and at this time, the main control unit may directly use data acquired in a previous communication cycle of the open circuit cycle as data acquired in the open circuit cycle to perform data analysis. When the next communication cycle of the open circuit cycle comes, the next communication cycle is merged with the data in the open circuit cycle to obtain the complete data of all the battery monitoring units in the series branch, at the moment, the merged data is used as the analysis data of the main control unit, and when the next communication cycle comes, the communication data obtained in the communication cycle is merged with the data in the previous communication cycle adjacent to the communication cycle to be used as the communication data obtained in the communication cycle to analyze the data.
Of course, in the technical solution disclosed in another embodiment of the present application, except for the manner of merging the data in two communication cycles to achieve the purpose of obtaining the data of all the battery monitoring units in the serial branch in each communication cycle, in this application, the data of all the battery monitoring units in the serial branch in the same communication cycle can be obtained in the same cycle by switching the communication path, specifically:
when the main control unit initiates data communication to the battery monitoring unit by adopting the target communication interface, if the series branch is detected to be broken, after the target communication interface acquires feedback data of the battery monitoring unit, in the period, the communication interface marked as an idle state in the communication period is continuously adopted to carry out data communication with the battery monitoring unit, and after the communication interface in the idle state acquires the communication data, the data acquired by the target communication interface and the communication interface in the idle state are combined to obtain the data of all the battery monitoring units in the series branch.
In the technical solution disclosed in the embodiment of the present application, when determining whether the communication branch has an open circuit, a corresponding technical means may be selected according to a user requirement, for example, in the technical solution disclosed in the embodiment of the present application, whether an open circuit condition exists in the serial branch may be determined in a fault determination manner of an overtime fault. In addition, the present application may also determine whether there is an open circuit in the series branch by:
acquiring a data volume acquired by a current communication interface of a main control unit, recording the data volume as a first data volume, and judging whether the first data volume is a preset value or not; the preset value is a preset value matched with the number of the battery monitoring units in the series branch, and when the first data volume is smaller than the preset value (the first data volume cannot be larger than the preset value), it indicates that an open circuit occurs in the series branch.
For the situation that when the open circuit fault of the serial branch occurs, the data of all the battery monitoring units of the serial branch are acquired in the same communication period in a path switching mode, the application also provides a specific example:
assuming that there are 10 battery monitoring units in the serial branch, a daisy chain communication line is disconnected between the fourth battery monitoring CMU4 and the CMU5, the Main control unit BMU will only access the data of the fourth battery monitoring unit CMU4 at most from the Main path (the communication path corresponding to the first communication interface), and the information of the fifth battery monitoring unit CMU5 and above is unknown; after the master control unit BMU has failed overtime for a period of time, or when it is determined by other means that there is an open circuit fault in the serial branch, when there is an open circuit fault in the serial branch, the master control unit BMU turns to a Loop path (a path corresponding to the second communication unit) to seek data of other cell monitoring units CMU, on the Loop path, the master control unit BMU will sequentially access data of the tenth cell monitoring unit CMU10, the ninth cell monitoring unit CMU9, and up to the fifth cell monitoring unit CMU5, and the master control unit BMU combines the data accessed twice to obtain all data of the 10 cell monitoring units CMU, although at this time, a communication disconnection has occurred between the fourth cell monitoring unit CMU4 and the fifth cell monitoring unit CMU5, the master control unit can still obtain data of all the cell monitoring units.
In the technical scheme disclosed in the embodiment of the application, a method for positioning a fault node when a series branch has an open circuit fault is also provided, and the method judges the position of the fault node according to the data volume difference of data obtained by two times of communication. Specifically, referring to fig. 4, the method may further include:
step S401: acquiring a data volume acquired by a current communication interface of a main control unit, recording the data volume as a first data volume, and judging whether the first data volume is a preset value or not;
step S402: when the first data volume is smaller than a preset value, acquiring a data volume acquired by the main control unit through another communication interface, and recording the data volume as a second data volume;
the obtaining of the data volume obtained by the main control unit through the other communication interface may refer to the data volume obtained by the main control unit through the other communication interface and the battery monitoring unit in the current communication cycle (at this time, the main control unit may adopt two communication interfaces to perform data communication with the battery monitoring unit in each communication cycle), or may refer to the data volume obtained by the main control unit through the other communication interface in the next communication cycle (at this time, the main control unit only adopts one communication interface to perform data communication with the battery monitoring unit in each communication cycle).
Step S403: calculating a difference between the first data volume and the second data volume;
specifically, the data volume corresponding to the first communication interface of the main control unit is determined from the first data volume and the second data volume, the data volume corresponding to the second communication interface of the main control unit is determined from the first data volume and the second data volume, and the data volume corresponding to the second communication interface of the main control unit is subtracted from the data volume corresponding to the first communication interface of the main control unit to obtain a difference value between the first data volume and the second data volume.
Step S404: and outputting circuit breaking warning information which is matched with the difference and used for representing the circuit breaking position.
For example, in the above specific example, when the daisy chain communication line is disconnected between the fourth battery monitoring CMU4 and the CMU5, the data amount of the data acquired by the main control unit through the first communication interface is: the data volumes corresponding to the first battery electronic control unit to the fourth battery monitoring unit assume that each battery monitoring unit corresponds to one data volume, at this time, the data volume acquired by the first communication interface should be 4, and the data volume acquired by the second communication interface is: data volumes corresponding to the fifth battery electronic control unit to the tenth battery monitoring unit, at this time, the data volume obtained by the first communication interface should be 6, a difference obtained by subtracting the second data volume from the first data volume is-2, and the accident position corresponding to the-2 is obtained from the preset mapping table and is between the fourth battery monitoring CMU4 and the CMU5, so that fault location is realized.
Corresponding to the above method, the present embodiment further provides an internal communication device of a distributed battery management system, and specific operation contents of each unit in the device, please refer to the contents of the above method embodiment, and the following describes the internal communication device of the distributed battery management system according to the embodiment of the present invention, where the internal communication device of the distributed battery management system described below and the internal communication method of the distributed battery management system described above may be referred to correspondingly. The device is applied to a main control unit, and referring to fig. 2, the main control unit is provided with two communication interfaces, wherein one communication interface is connected with the first battery monitoring unit positioned at the head part in a serial branch, and the other communication interface is connected with the last battery monitoring unit positioned at the tail part in the serial branch; the series branch is formed by sequentially connecting N battery monitoring units in series;
the device comprises:
the communication interface selection unit is used for acquiring a communication interface in an idle state on the main control unit in the last communication cycle and recording the communication interface as a target communication interface; and adopting the target communication interface of the main control unit as a communication interface for communicating with the battery monitoring unit at this time.
Corresponding to the method, the internal communication device of the distributed battery management system further includes:
the circuit breaking detection unit is used for detecting whether a circuit breaking fault occurs in the series branch circuit;
and the data integration unit is used for merging the data acquired in two adjacent communication periods after the circuit break occurs when the circuit break detection unit detects that the circuit break fault occurs in the serial branch and using the merged data as the communication data in one communication period.
Corresponding to the above method, the data integration unit is alternatively configured to: when the main control unit initiates data communication to the battery monitoring unit by adopting the target communication interface, if the series branch is detected to be broken, after the target communication interface acquires feedback data of the battery monitoring unit, in the period, the communication interface marked as an idle state in the communication period is continuously adopted to carry out data communication with the battery monitoring unit, and after the communication interface in the idle state acquires the communication data, the data acquired by the target communication interface and the communication interface in the idle state are combined to obtain the data of all the battery monitoring units in the series branch.
Corresponding to the method, in the internal communication device of the distributed battery management system, the disconnection detecting unit is specifically configured to: judging whether the series branch is broken or not by a fault judgment mode of overtime fault, or judging whether the series branch is broken or not by adopting the following method:
the method comprises the steps of obtaining a data volume obtained by a current communication interface of a main control unit, recording the data volume as a first data volume, judging whether the first data volume is a preset value or not, and outputting a trigger signal for representing that a series branch circuit has an open circuit fault to a data integration unit when the first data volume is smaller than the preset value.
Corresponding to the method, the internal communication device of the distributed battery management system further includes:
the circuit breaking positioning unit is used for acquiring the data volume acquired by the main control unit through another communication interface and recording the data volume as a second data volume when the circuit breaking detection unit detects that a circuit breaking fault occurs in the serial branch; calculating a difference between the first data volume and the second data volume; and outputting circuit breaking warning information which is matched with the difference and used for representing the circuit breaking position.
The obtaining of the data volume obtained by the main control unit through the other communication interface may refer to the data volume obtained by the main control unit through the other communication interface and the battery monitoring unit in the current communication cycle (at this time, the main control unit may adopt two communication interfaces to perform data communication with the battery monitoring unit in each communication cycle), or may refer to the data volume obtained by the main control unit through the other communication interface in the next communication cycle (at this time, the main control unit only adopts one communication interface to perform data communication with the battery monitoring unit in each communication cycle).
Corresponding to the above device, the present application also discloses a distributed battery management system, including:
the monitoring system comprises a main control unit and at least two battery monitoring units, wherein the number of the battery monitoring units can be 4 or other numbers;
the at least two battery monitoring units are connected in series to form a series branch,
the main control unit is provided with two communication interfaces, wherein one communication interface is connected with the first battery monitoring unit positioned at the head part in the serial branch, and the other communication interface is connected with the last battery monitoring unit positioned at the tail part in the serial branch;
the main control unit is applied to a daisy chain communication device of the battery monitoring unit according to any one of the above embodiments of the present application.
For convenience of description, the above system is described with the functions divided into various modules, which are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations of the invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The 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 (10)
1. An internal communication method of a distributed battery management system, for implementing internal communication in the distributed battery management system, the distributed battery management system comprising:
the system comprises a main control unit and at least two battery monitoring units;
the at least two battery monitoring units are connected in series to form a series branch;
the main control unit is provided with two communication interfaces, wherein one communication interface is connected with the first battery monitoring unit positioned at the head part in the serial branch, and the other communication interface is connected with the last battery monitoring unit positioned at the tail part in the serial branch;
the method comprises the following steps:
determining a communication interface in an idle state on the main control unit in a previous communication period, and recording the communication interface as a target communication interface;
and adopting the target communication interface of the main control unit as a communication interface for communicating with the battery monitoring unit at this time.
2. The internal communication method of the distributed battery management system according to claim 1, further comprising:
when the series branch is detected to be broken, merging data acquired in two adjacent communication periods after the broken circuit occurs to serve as communication data in one communication period;
or, when detecting that the series branch is broken, in the same communication period, the main control unit adopts two communication interfaces to communicate with the battery monitoring unit respectively, and combines data acquired by the two communication interfaces to serve as communication data in one communication period.
3. The internal communication method of the distributed battery management system according to claim 2, further comprising:
the method comprises the steps of obtaining a data volume obtained by a current communication interface of a main control unit, recording the data volume as a first data volume, judging whether the first data volume is a preset value or not, and generating a circuit breaking signal for representing that circuit breaking occurs in a series branch when the first data volume is not the preset value.
4. The internal communication method of the distributed battery management system according to claim 3, further comprising:
acquiring a data volume acquired by a current communication interface of a main control unit, recording the data volume as a first data volume, and judging whether the first data volume is a preset value or not;
when the first data volume is smaller than a preset value, acquiring the data volume acquired by the main control unit from a next communication interface in a next communication period, and recording the data volume as a second data volume;
calculating a difference between the first data volume and the second data volume;
and outputting circuit breaking warning information which is matched with the difference and used for representing the circuit breaking position.
5. An internal communication device of a distributed battery management system is characterized in that the internal communication device is applied to a main control unit, the main control unit is provided with two communication interfaces, one communication interface is connected with a first battery monitoring unit positioned at the head part in a serial branch, and the other communication interface is connected with a last battery monitoring unit positioned at the tail part in the serial branch; the series branch is formed by sequentially connecting N battery monitoring units in series;
the device comprises:
the communication interface selection unit is used for acquiring a communication interface in an idle state on the main control unit in the last communication cycle and recording the communication interface as a target communication interface; and adopting the target communication interface of the main control unit as a communication interface for communicating with the battery monitoring unit at this time.
6. The internal communication device of the distributed battery management system according to claim 5, further comprising:
the circuit breaking detection unit is used for detecting whether a circuit breaking fault occurs in the series branch circuit;
the data integration unit is used for merging the data acquired in two adjacent communication periods after the circuit break occurs when the circuit break detection unit detects that the circuit break fault occurs in the serial branch and using the merged data as the communication data in one communication period; or, the main control unit is configured to, when it is detected that the series branch is disconnected, in the same communication cycle, adopt two communication interfaces to communicate with the battery monitoring unit, respectively, and merge data acquired by the two communication interfaces to serve as communication data in one communication cycle.
7. The intercom system of the distributed battery management system of claim 6, wherein said disconnection detection unit is specifically configured to:
the method comprises the steps of obtaining a data volume obtained by a current communication interface of a main control unit, recording the data volume as a first data volume, judging whether the first data volume is a preset value or not, and outputting a trigger signal for representing that a series branch circuit has an open circuit fault to a data integration unit when the first data volume is smaller than the preset value.
8. The internal communication device of the distributed battery management system according to claim 7, further comprising:
the circuit breaking positioning unit is used for acquiring the data volume acquired by the main control unit from the next communication interface in the next communication period and recording the data volume as a second data volume when the circuit breaking detection unit detects that a circuit breaking fault occurs in the serial branch; calculating a difference between the first data volume and the second data volume; and outputting circuit breaking warning information which is matched with the difference and used for representing the circuit breaking position.
9. A distributed battery management system, comprising:
the system comprises a main control unit and at least two battery monitoring units;
the at least two battery monitoring units are connected in series to form a series branch,
the main control unit is provided with two communication interfaces, wherein one communication interface is connected with the first battery monitoring unit positioned at the head part in the serial branch, and the other communication interface is connected with the last battery monitoring unit positioned at the tail part in the serial branch;
the main control unit is applied with a daisy chain communication device of the battery monitoring unit of any one of claims 5-8.
10. The distributed battery management system of claim 1, wherein the number of battery monitoring units is 4.
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