CN115696098B - BMS system data transmission method and BMS system - Google Patents
BMS system data transmission method and BMS system Download PDFInfo
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- CN115696098B CN115696098B CN202211719231.9A CN202211719231A CN115696098B CN 115696098 B CN115696098 B CN 115696098B CN 202211719231 A CN202211719231 A CN 202211719231A CN 115696098 B CN115696098 B CN 115696098B
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Abstract
The application relates to the technical field of battery management, and provides a BMS system and a data transmission method thereof. The method is applied to a BMS system and comprises the following steps: the master control unit determines a plurality of reported data volumes according to the current working condition and the battery characteristics, and sends corresponding data volume reporting parameters to the master control unit or the slave control unit according to the reported data volumes; the reported data volume corresponds to the slave control unit or the master control unit, and the data volume reporting parameter is used for indicating the reporting condition of the corresponding data volume; and the slave control unit or the master control unit receives the corresponding data volume reporting parameters, detects the real-time values of the corresponding data volumes according to the data volume reporting parameters, and sends the real-time values of the data volumes to the master control unit as the reporting values of the data volumes after the real-time values of the data volumes meet the reporting conditions indicated by the corresponding data volume reporting parameters. According to the method and the device, the reporting time period of the data volume in the BMS system can be shortened, and the transmission speed is improved.
Description
Technical Field
The application relates to the technical field of battery management, in particular to a BMS system and a data transmission method thereof.
Background
The Battery Management System (BMS System) has a function of monitoring information of a Battery pack therein, such as voltage, current, temperature, internal resistance, state of Charge (SOC), state of Health (SOH), and remaining Energy of the Battery (SOE), and further implements Management and control of the Battery pack according to the information of the Battery pack.
The BMS generally adopts a master-slave distributed architecture, and is internally divided into a master control unit, a plurality of master control units and a plurality of slave control units. Each slave control unit monitors the corresponding battery pack and a plurality of single batteries in the battery pack, and each master control unit monitors the corresponding battery cluster. Each slave control unit is communicated with a corresponding master control unit through CAN communication cascade, and each master control unit is communicated with a master control unit through CAN communication cascade. The master control unit needs to acquire the battery cluster information monitored by the master control unit, the battery pack information monitored by the slave control unit and the single battery information, so as to perform overall monitoring, state control, safety protection, health diagnosis and the like on the BMS according to the information.
Because the BMS system usually comprises hundreds of battery packs and tens of thousands of single batteries, and the battery packs and the single batteries respectively correspond to various monitoring data volumes, the data volumes to be reported in the BMS system are huge. The traditional BMS data transmission method has the defects that the data volume reporting time period is long, a master control unit cannot timely and effectively acquire abnormal data volume, and meanwhile, CAN communication is easily interfered by the environment to cause transmission errors, so that the risk of frame loss exists.
Disclosure of Invention
In view of this, the embodiment of the present application provides a BMS system data transmission method and a BMS system, so as to solve the technical problems that a conventional BMS system data transmission method has a long data volume reporting time period, and a master control unit cannot timely and effectively acquire an abnormal data volume.
In a first aspect, an embodiment of the present application provides a BMS system data transmission method, where the BMS system includes a master control unit, a plurality of master control units, and a plurality of slave control units. The method comprises the following steps: the master control unit determines a plurality of reported data volumes according to the current working condition and the battery characteristics, and sends corresponding data volume reporting parameters to the master control unit or the slave control unit according to the reported data volumes; the reported data volume corresponds to the slave control unit or the master control unit, and the data volume reporting parameter is used for indicating the reporting condition of the corresponding data volume; and the slave control unit and/or the master control unit receive the corresponding data volume reporting parameters, detect the real-time values of the corresponding data volumes according to the data volume reporting parameters, and send the real-time values of the data volumes to the master control unit as the reported values of the data volumes after the real-time values of the data volumes meet the reporting conditions indicated by the corresponding data volume reporting parameters.
In a possible implementation manner of the first aspect, the slave control unit is configured to collect and detect real-time values of data amounts of the corresponding battery pack and real-time values of data amounts of a plurality of single batteries in the battery pack; the main control unit is used for collecting and detecting real-time values of data quantity of the corresponding battery clusters. The method for receiving the corresponding data volume reporting parameter from the slave control unit and/or the master control unit and detecting the real-time value of the corresponding data volume according to the data volume reporting parameter includes: the slave control unit receives at least one corresponding data volume reporting parameter, and detects the real-time values of the corresponding data volume of the corresponding battery pack and/or the real-time values of the corresponding data volumes of a plurality of single batteries in the battery pack according to the data volume reporting parameters; and/or the main control unit receives the corresponding at least one data volume reporting parameter and detects the real-time value of the corresponding data volume of the corresponding battery cluster according to each data volume reporting parameter.
In a possible implementation manner of the first aspect, the reporting condition includes an out-of-limit reporting condition and a timeout reporting condition; the slave control unit and/or the master control unit sends the real-time value of the data volume as the reported value of the data volume to the master control unit after the real-time value of the data volume meets the reporting condition indicated by the corresponding data volume reporting parameter, and the method comprises the following steps: the slave control unit and/or the master control unit calculates a first difference value between a real-time value of the data volume and a last reported value of the data volume, and if the first difference value meets an out-of-limit reporting condition indicated by a corresponding data volume reporting parameter, the real-time value of the data volume is used as the reported value of the data volume and is sent to the master control unit; and the slave control unit and/or the master control unit calculate a second difference value between the acquisition time of the real-time value of the data volume and the sending time of the last reported value of the data volume, and if the second difference value meets the overtime reporting condition indicated by the corresponding data volume reporting parameter, the real-time value of the data volume is used as the reported value of the data volume and sent to the master control unit.
In a possible implementation manner of the first aspect, the method further includes: the master control unit receives the reported value of the data volume and judges whether to adjust the corresponding data volume reporting parameter according to the reported value of the data volume; if the corresponding data quantity reporting parameters need to be adjusted, the master control unit adjusts the corresponding data quantity reporting parameters according to the corresponding preset parameters, and sends the adjusted data quantity reporting parameters to the corresponding master control unit or the slave control unit, so that the corresponding master control unit or the slave control unit detects the real-time values of the corresponding data quantities according to the adjusted data quantity reporting parameters and sends the reporting values of the corresponding data quantities.
In a possible implementation manner of the first aspect, the receiving, by the master control unit, the report value of the data volume, and determining whether to adjust the corresponding data volume reporting parameter according to the report value of the data volume includes: the master control unit receives the reported value of the data volume; the master control unit calculates a third difference value between the reported value of the data volume and the received previous reported value of the corresponding data volume, and calculates a fourth difference value between the receiving time of the reported value of the data volume and the receiving time of the received previous reported value of the corresponding data volume; and the master control unit judges whether to adjust the corresponding data volume reporting parameters according to the third difference, the fourth difference and the preset parameter adjusting conditions.
In a possible implementation manner of the first aspect, the data volume reporting parameter is further configured to indicate a priority of the corresponding data volume; the slave control unit and/or the master control unit send the real-time value of the data volume as the reported value of the data volume to the master control unit, and the method comprises the following steps: the slave control unit and/or the master control unit frames the reported value of at least one data volume to obtain a data frame, and takes the highest priority in the priorities of the corresponding data volumes in the data frame as the reporting priority of the data frame; the slave control unit and/or the master control unit writes the data frames into corresponding reporting priority areas of the data cache areas of the slave control unit or the master control unit based on the reporting priorities, sends the data frames to the master control unit according to the reporting priority order of the reporting priority areas, and stores the data frames into the data backup areas of the slave control unit or the master control unit.
In a possible implementation manner of the first aspect, the sending, by the slave unit and/or the master unit, the data frame to the master control unit according to the priority order of the reported priority area includes: the slave control unit and/or the master control unit endows the frame sequence number with the data frame which is sequenced from the first in the corresponding reporting priority area as the data frame to be sent according to the priority sequence from high to low in the reporting priority area; the frame number of the data frame to be sent is the frame number of the last data frame to be sent in the reporting priority area plus 1; and the slave control unit and/or the master control unit sends the data frame to be sent to the master control unit, and sends the next data frame in the corresponding reporting priority area as the data frame to be sent to give a frame number, until the data frames in the corresponding reporting priority area are all sent or reach the preset sending times, the frame number of the data frame in the next reporting priority area is given and sent.
In a possible embodiment of the first aspect, the slave unit, the master control unit and the master control unit are defined as a subordinate unit and a superordinate unit; in the relation between a pair of upper and lower units, when the lower unit is a slave unit, the upper unit is a master unit; when the lower unit is a master control unit, the upper unit is a master control unit; the method further comprises the following steps: the superior unit receives a data frame to be sent as a current data frame, and judges whether the frame number of the current data frame and the frame number of a previous data frame with the same reporting priority are increased progressively continuously or not; if not, confirming that the frame loss condition exists, and enabling the superior unit to form a feedback frame by the frame sequence number of the last data frame with the same reporting priority and the reporting priority and return the feedback frame to the subordinate unit; and after receiving the feedback frame, the lower unit determines a corresponding number of data frames according to the frame serial number and the reporting priority in the feedback frame, and re-writes the corresponding number of data frames into the first-ordered position of the corresponding reporting priority area of the data cache area from the data backup area of the lower unit.
In a possible implementation manner of the first aspect, the slave control units are in communication connection with corresponding master control units, and the master control units are in communication connection with the master control unit; the master control unit issues corresponding data volume reporting parameters to the master control unit or the slave control unit according to the reported data volumes, and the parameters comprise: the master control unit sends corresponding data volume reporting parameters to the master control unit according to the reported data volumes; and the master control unit sends the data volume reporting parameters corresponding to the corresponding slave control units in the data volume reporting parameters to the corresponding slave control units.
Correspondingly, the slave control unit and/or the master control unit sends the real-time value of the data volume as the report value of the data volume to the master control unit after the real-time value of the data volume meets the report condition, and the method comprises the following steps: the slave control unit sends the real-time value of the data quantity meeting the reporting condition to the corresponding master control unit as the reporting value of the data quantity; the main control unit takes the real-time value of the data quantity meeting the reporting condition as the reporting value of the data quantity, and the received reporting value of the data quantity corresponding to the corresponding slave control unit is sent to the master control unit.
In a second aspect, an embodiment of the present application provides a BMS system, including a master control unit, a plurality of master control units, and a plurality of slave control units; the slave control unit is in communication connection with the corresponding main control unit, and the main control unit is in communication connection with the master control unit.
The slave control unit is used for acquiring and detecting real-time values of data quantity of the corresponding battery pack and real-time values of data quantity of a plurality of single batteries in the battery pack; the main control unit is used for collecting and detecting real-time values of the data volume of the corresponding battery cluster, and receiving reported values of the data volume of the battery pack and the data volume of the single battery sent from the control unit; the master control unit is used for receiving the reported value of the data volume of the battery cluster, the reported value of the data volume of the battery pack and the reported value of the data volume of the single battery which are sent by the corresponding master control unit. The BMS system performs the BMS system data transmission method according to any one of the first aspects.
It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.
According to the BMS system data transmission method and the BMS system, the master control unit issues the corresponding quantity reporting parameters to the master control unit or the slave control unit according to the current working condition and the battery characteristics, the master control unit or the slave control unit detects the real-time values of the corresponding data quantity according to the corresponding data quantity reporting parameters, and sends the real-time values of the data quantity to the master control unit as the reporting values of the data quantity after the real-time values of the data quantity meet the reporting conditions indicated by the reporting parameters, so that the reporting values of the data quantity required under the current working condition and the battery characteristics can be only reported, the reporting time period of the data quantity in the BMS system is shortened, and the transmission speed is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a BMS system provided in an embodiment of the present application;
fig. 2 is a schematic flowchart of a data transmission method of a BMS system according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a data transmission method of a BMS system according to another embodiment of the present application;
FIG. 4 is a schematic diagram of a data cache according to an embodiment of the present application;
FIG. 5 is a diagram of a data backup area according to an embodiment of the present application;
fig. 6 (a) is a schematic flowchart of a BMS system data transmission method according to still another embodiment of the present application;
fig. 6 (b) is a schematic flowchart of a data transmission method of a BMS system according to still another embodiment of the present application;
fig. 6 (c) is a schematic flowchart of a data transmission method of a BMS system according to still another embodiment of the present application;
fig. 7 is a block diagram of a flow chart of a data transmission method of a BMS system according to an embodiment of the present application.
Detailed Description
The present application will be described more clearly with reference to specific examples. The following examples will assist those skilled in the art in further understanding the role of the present application, but are not intended to limit the application in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
In the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In addition, the references to "a plurality" in the embodiments of the present application should be interpreted as two or more.
Fig. 1 is a schematic structural diagram of a BMS system according to an embodiment of the present application. As shown in fig. 1, the BMS system includes a master control unit, a plurality of master control units, and a plurality of slave control units. The slave control unit is in communication connection with the corresponding main control unit, and the main control unit is in communication connection with the master control unit. The BMS system performs the BMS system data transmission method.
The slave control unit is used for collecting and detecting the real-time values of the data quantity of the corresponding battery pack and the real-time values of the data quantities of the plurality of single batteries in the battery pack. The main control unit is used for collecting and detecting a real-time value of the data volume of the corresponding battery cluster, and receiving a report value of the data volume of the battery pack and a report value of the data volume of the single battery, which are sent from the main control unit. The slave control unit and the master control unit collect real-time values of corresponding data quantities at a first preset frequency and detect the collected real-time values of the corresponding data quantities at a second preset frequency when needed. The master control unit is used for receiving the reported value of the data volume of the battery cluster, the reported value of the data volume of the battery pack and the reported value of the data volume of the single battery which are sent by the corresponding master control unit.
That is, each slave unit corresponds to each battery pack, and each battery pack includes a plurality of battery cells therein. Each main control unit corresponds to each battery cluster respectively, and each battery cluster comprises a plurality of battery packs.
Optionally, the data transmission method of the BMS system may be a data transmission method of the BMS system provided in any embodiment of the present application. Each slave control unit communicates with a corresponding master control unit through CAN communication cascade, and each master control unit communicates with the master control unit through CAN communication cascade.
Illustratively, in order to better distinguish the relationship between the slave control unit and the master control unit and the corresponding battery pack and battery cluster, the slave control unit and the master control unit, and the battery pack and the battery cluster are numbered. The unit numbers comprise main control unit numbers and slave control unit numbers, and the battery numbers comprise battery pack numbers, single battery numbers and battery cluster numbers. For example, the battery cluster number 1 represents a first battery cluster, corresponding to a first master control unit of the master control unit number (1). The battery pack number 1-2 represents a second battery pack in the first battery cluster, the slave control unit number (1-2) represents a second slave control unit corresponding to the first master control unit, and the battery pack number 1-2 corresponds to the slave control unit number (1-2). The cell number 1-2-6 represents the sixth cell in the second battery pack in the first battery cluster, and corresponds to the slave control unit with the slave control unit number (1-2).
Fig. 2 is a schematic flowchart of a data transmission method of a BMS system according to an embodiment of the present application. As shown in fig. 2, the method in the embodiment of the present application is applied to a BMS system, and may include:
The reported data volume corresponds to the slave control unit or the master control unit, that is, the multiple reported data volumes include a reported data volume corresponding to the slave control unit and/or a reported data volume corresponding to the master control unit, that is, the multiple reported data volumes include a data volume corresponding to the battery pack and/or a data volume corresponding to the single battery and/or a data volume corresponding to the battery cluster. The data volume reporting parameter corresponds to a reported data volume, so the data volume reporting parameter corresponds to the slave control unit or the master control unit, that is, the plurality of data volume reporting parameters include a data volume reporting parameter corresponding to the slave control unit and/or a data volume reporting parameter corresponding to the master control unit. The data volume reporting parameter is used for indicating the reporting condition of the corresponding data volume.
For example, the change condition of each data amount is greatly influenced by different working conditions and battery characteristics, that is, the data amount required by the master control unit is different under different working conditions and battery characteristics. For example, in a certain charge-discharge state of the single battery, the voltage change speed of the single battery is high, the master control unit needs to obtain the voltage and the current of the single battery in time, and does not need other data volume of the single battery, the data volume of the corresponding battery pack and the data volume of the corresponding battery cluster, and the voltage and the current of the single battery are the reported data volume at the moment. By only reporting the reported values of the data volume required under the current working condition and the battery characteristic, the problem of long data volume reporting time period caused by reporting of massive data volume in a BMS system can be avoided.
Optionally, under different working conditions and battery characteristics, the reported data volume is different, and the reporting parameters corresponding to the same reported data volume are different.
As can be seen from the foregoing, the slave control units are in communication connection with the corresponding master control units, and the master control units are in communication connection with the master control unit. In some embodiments, the issuing, by the master control unit, the corresponding data volume reporting parameter to the master control unit or the slave control unit according to each reported data volume may specifically include: the master control unit sends corresponding data volume reporting parameters to the master control unit according to the reported data volumes; and the master control unit sends the data volume reporting parameters corresponding to the corresponding slave control units in the data volume reporting parameters to the corresponding slave control units.
And 102, receiving the corresponding data quantity reporting parameter from the slave control unit and/or the master control unit, detecting the corresponding data quantity real-time value according to the data quantity reporting parameter, and sending the data quantity real-time value serving as the data quantity reporting value to the master control unit after the data quantity real-time value meets the reporting condition indicated by the corresponding data quantity reporting parameter.
The slave control unit is used for acquiring and detecting real-time values of data quantities of corresponding battery packs and real-time values of data quantities of a plurality of single batteries in the battery packs; the main control unit is used for collecting and detecting the real-time value of the data volume of the corresponding battery cluster.
It should be noted that, as can be seen from the foregoing, the data volume reporting parameter corresponds to the slave control unit or the master control unit, that is, the multiple data volume reporting parameters include a data volume reporting parameter corresponding to the slave control unit and/or a data volume reporting parameter corresponding to the master control unit. Therefore, the receiving of the corresponding data amount reporting parameter by the slave control unit and/or the master control unit in step 102 means that the slave control unit receives the corresponding data amount reporting parameter and/or the master control unit receives the corresponding data amount reporting parameter. And similarly, the description of the slave unit and/or master unit is used similarly in the embodiments described later herein.
For example, the data amount of the battery pack may include data amounts of total voltage, current, ambient temperature, terminal temperature, combustible gas concentration, SOC, SOH, and SOE of the battery pack. The data amount of the unit cell may include data amounts of voltage, current, temperature, internal resistance, SOC, SOH, and SOE of the unit cell. The data amount of the battery cluster may include data amounts of total voltage, current, ambient temperature, terminal temperature, insulation resistance, SOC, SOH, and SOE of the battery cluster.
It should be noted that, for a plurality of single batteries in the same battery pack, the data volume reporting parameters of the plurality of single batteries are the same (for example, if the reported data volume is the voltage and the current of a single battery, only one voltage reporting parameter and one current reporting parameter are issued for the plurality of single batteries in the same battery pack). For the single batteries in different battery packs, the data volume reporting parameters may be different. The data volume reporting parameters may be different for different battery packs. For different battery clusters, the data volume reporting parameters may be different.
In some embodiments, after the real-time value of the data amount satisfies the reporting condition, the slave control unit and/or the master control unit sends the real-time value of the data amount as the reporting value of the data amount to the master control unit, which may specifically include: the slave control unit sends the real-time value of the data volume meeting the reporting condition as the reporting value of the data volume to the corresponding master control unit; the main control unit takes the real-time value of the data quantity meeting the reporting condition as the reporting value of the data quantity, and the received reporting value of the data quantity corresponding to the corresponding slave control unit is sent to the master control unit.
Optionally, when the reported data amount does not include the data amount corresponding to the slave control unit, the master control unit only uses a real-time value of the data amount satisfying the reporting condition in the data amount corresponding to the master control unit as a reporting value of the data amount, and sends the reporting value to the master control unit. And when the reported data volume does not comprise the data volume corresponding to the master control unit, the master control unit only sends the received reported value of the data volume corresponding to the slave control unit to the master control unit.
In a possible implementation manner, step 102 may specifically include:
step 1021, receiving at least one corresponding data volume reporting parameter from the control unit, and detecting a real-time value of a corresponding data volume of a corresponding battery pack and/or a real-time value of corresponding data volumes of a plurality of single batteries in the battery pack according to each data volume reporting parameter; and/or the main control unit receives the corresponding at least one data volume reporting parameter and detects the real-time value of the corresponding data volume of the corresponding battery cluster according to each data volume reporting parameter.
Optionally, the data volume reporting parameter includes a battery number, a data volume name, a priority of the data volume, and a data volume reporting start. And the master control unit issues the corresponding data volume reporting parameters to the corresponding slave control units or the master control unit according to the battery codes and the unit codes in the data volume reporting parameters. After determining a plurality of reported data volumes, the master control unit sets the data volume reporting start in the data volume reporting parameters corresponding to the plurality of reported data volumes to be on, and sets the data volume reporting start in the data volume reporting parameters corresponding to other data volumes which do not need to be reported except the plurality of reported data volumes to be off.
For example, after receiving the corresponding data volume reporting parameter from the control unit, the slave control unit detects a real-time value of the cell voltage of each cell in the battery pack according to the cell voltage indicated by the data volume name in the data volume reporting parameter. And after receiving the corresponding data volume reporting parameters, the main control unit detects the real-time value of the SOC of the battery pack according to the SOC of the battery pack indicated by the data volume name in the data volume reporting parameters.
Optionally, the priority of the data volume indicates the reporting requirement of the corresponding data volume, for example, the priority of the data volume may be divided into 1, 2, and 3, and a smaller number of the series indicates a higher priority, that is, the reporting requirement of the corresponding data volume is higher.
Step 1022, the slave control unit and/or the master control unit calculates a first difference between the real-time value of the data volume and the last reporting value of the data volume, and if the first difference satisfies the out-of-limit reporting condition indicated by the corresponding data volume reporting parameter, the real-time value of the data volume is sent to the master control unit as the reporting value of the data volume.
And 1023, the slave control unit and/or the master control unit calculates a second difference value between the acquisition time of the real-time value of the data volume and the sending time of the last reported value of the data volume, and if the second difference value meets the overtime reporting condition indicated by the corresponding data volume reporting parameter, the real-time value of the data volume is used as the reported value of the data volume and sent to the master control unit.
Optionally, the data volume reporting parameter further includes a data volume reporting limit and a data volume reporting timeout time. The data volume reporting limit is a reporting limit of the numerical value variation of the corresponding data volume. The data volume reporting timeout time is the reporting limit of the time variation of the corresponding data volume.
Optionally, if it is detected that a first difference between the real-time value of the data volume and a last reporting value of the data volume is greater than the data volume reporting limit of the data volume, the first difference satisfies an out-of-limit reporting condition. And if a second difference value between the acquisition time of the real-time value of the data volume and the sending time of the last reported value of the data volume is detected to be greater than the data volume reporting timeout time of the data volume, the second difference value meets the timeout reporting condition. The sending time is the time for sending the data volume from the slave control unit or the master control unit to the master control unit.
The data quantity reporting overtime time can be set to avoid the situation, so that the numerical variation of some data quantities can be reported when the time variation reaches the data quantity reporting overtime time even if the numerical variation of some data quantities does not reach the data quantity reporting limit value.
In a possible implementation manner, in order to improve the accuracy and effectiveness of the data quantity reporting parameters and further improve the data transmission speed, the corresponding data quantity reporting parameters may be adjusted according to the reporting value of the data quantity received by the master control unit. Specifically, referring to fig. 3, the BMS system data transmission method provided in the embodiment of the present application may further include:
and 103, the master control unit receives the reported value of the data volume and judges whether to adjust the corresponding data volume reporting parameter according to the reported value of the data volume.
And step 104, if the corresponding data volume reporting parameters need to be adjusted, the master control unit adjusts the corresponding data volume reporting parameters according to the corresponding preset parameters, and sends the adjusted data volume reporting parameters to the corresponding master control unit or the slave control unit, so that the corresponding master control unit or the slave control unit detects the real-time values of the corresponding data volumes according to the adjusted data volume reporting parameters and sends the reporting values of the corresponding data volumes.
It should be noted that, taking each battery cluster and each battery pack as a unit, the master control unit adjusts the corresponding data volume reporting parameter according to the received reported value of the data volume of each battery cluster, the received reported value of the data volume of each battery pack, and the received reported value of the data volume of each battery cell in the battery pack.
Optionally, the master control unit sends the adjusted data volume reporting parameter to the corresponding master control unit or the slave control unit in the form of a data volume reporting parameter adjustment frame.
In a possible implementation manner, in step 103, specifically, the method may include:
and step 1031, the master control unit receives the reported value of the data volume.
Step 1032, the master control unit calculates a third difference between the reported value of the data amount and the received previous reported value of the corresponding data amount, and calculates a fourth difference between the receiving time of the reported value of the data amount and the receiving time of the received previous reported value of the corresponding data amount.
And 1033, the master control unit judges whether to adjust the corresponding data volume reporting parameter according to the third difference, the fourth difference and a preset parameter adjusting condition.
For example, after the total control unit calculates a third difference and a fourth difference corresponding to a certain data amount, if the third difference is smaller than the low value threshold and the fourth difference is larger than the high time threshold, the corresponding data amount reporting parameter is not adjusted.
The following are several situations that require adjustment of corresponding data volume reporting parameters:
1. and if the third difference is greater than the high value threshold and the fourth difference is greater than the high time threshold, reducing the data volume reporting timeout time in the data volume reporting parameter of the data volume by a first time preset value.
2. And if the third difference is larger than the high value threshold and the fourth difference is smaller than the low time threshold, reducing the data volume reporting limit value in the data volume reporting parameter of the data volume by a first value preset value.
3. And if the third difference is smaller than the low value threshold and the fourth difference is smaller than the low time threshold, increasing the data volume reporting timeout time in the data volume reporting parameter of the data volume by a second time preset value.
The preset parameters may include a first time preset value, a second time preset value, and a first value preset value, and specific values of the preset parameters corresponding to different data volumes are different under different types of data volumes and different battery packs or battery clusters.
It should be noted that, as can be seen from the foregoing step 102, the data quantity reporting parameters of the multiple single batteries in the same battery pack are the same, that is, the same data quantity of the multiple single batteries in the same battery pack corresponds to one data quantity reporting parameter. When the master control battery judges whether to adjust the data quantity reporting parameter, the data quantity reporting parameter is adjusted only by judging that the corresponding data quantity reporting parameter needs to be adjusted according to the real-time value of the corresponding data quantity of any single battery in the battery pack.
In a possible implementation manner, in step 102, the sending, by the slave control unit and/or the master control unit, the real-time value of the data amount as the reported value of the data amount to the master control unit may specifically include:
s1, framing the reported value of at least one data volume by the slave control unit and/or the master control unit to obtain a data frame, and taking the highest priority in the priorities of the corresponding data volumes in the data frame as the reporting priority of the data frame.
And S2, the slave control unit and/or the master control unit writes the data frames into corresponding reporting priority areas of the data buffer areas of the slave control unit or the master control unit based on the reporting priorities, and stores the data frames into data backup areas of the slave control unit or the master control unit after sending the data frames to the master control unit according to the reporting priority order of the reporting priority areas.
Optionally, the data frame may include a reporting priority of the data frame, a frame type, a battery pack to which the data frame belongs, a data volume 1, …, and a data volume N. And when each slave control unit frames the collected reported value of at least one data volume, framing the reported value of the data volume of the single battery and the reported value of the data volume of the battery pack separately. When the real-time value of the data amount is too large, a plurality of data frames may be composed.
For example, the reporting priority of the data frame indicates the reporting requirement of the corresponding data frame, and since the highest priority among the priorities of the data amount in the data frame is used as the reporting priority of the data frame, the reporting priority of the data frame corresponds to the priority of the data amount, and can be divided into 1, 2, and 3, and a smaller number of the series indicates a higher reporting priority, that is, the reporting requirement of the corresponding data frame is higher. The frame type indicates the type of the data frame, and may be configured based on the battery number, for example, the frame type of the 1 st data frame of the second battery pack in the first battery cluster may be 1-2 data frames 1, and the frame type of the 2 nd data frame of the third battery pack in the first battery cluster may be 1-3 data frames 2. The affiliated battery pack is a number of the battery pack corresponding to the data amount in the data frame, and the affiliated battery pack is meaningless in the data frame corresponding to the battery cluster and can be represented by 0.
It should be noted that, when a data frame is written into a corresponding reporting priority region of a data buffer, if a data frame of the same frame type as the data frame already exists in the data buffer, the data frame is replaced with a data frame of the same frame type as the data frame, which is because a plurality of data frames are accumulated in the data buffer, so that a previous data frame of the same frame type is not yet transmitted when a current data frame is written into the data buffer, and in order to ensure validity and accuracy of data transmission, the current data frame is replaced with the previous data frame of the same frame type.
Fig. 4 is a schematic diagram of a data buffer according to an embodiment of the present application. As shown in fig. 4, the data buffer area of the slave control unit or the master control unit is divided into a plurality of corresponding reporting priority areas according to the reporting priority of the data frame, for example, the areas may be divided into a level 1 reporting priority area, a level 2 reporting priority area, and a level 3 reporting priority area. And the slave control unit or the master control unit writes the data frames into corresponding reporting priority areas of the corresponding data cache areas according to the number of the reporting priorities in the data frames.
Similarly, fig. 5 is a schematic diagram of a data backup area according to an embodiment of the present application. As shown in fig. 5, the data backup area of the slave unit or the master unit is divided into a plurality of corresponding reporting priority areas according to the reporting priority of the data frame, for example, the reporting priority areas may be divided into a level 1 reporting priority area, a level 2 reporting priority area, and a level 3 reporting priority area. After the slave control unit sends the data frame to the master control unit, the data frame is written into a corresponding reporting priority area of a data backup area of the slave control unit according to the level of the reporting priority in the data frame. After the main control unit sends the data frame to the master control unit, the data frame is written into a corresponding reporting priority area of a data backup area of the main control unit according to the number of reporting priorities in the data frame.
In some embodiments, the sending, by the slave control unit and/or the master control unit in S2, the data frame to the master control unit according to the priority order of the reported priority area may specifically include:
and the slave control unit and/or the master control unit endows the frame sequence number with the data frame which is sequenced from the first data frame in the corresponding reporting priority area as the data frame to be sent according to the priority sequence from high to low of the reporting priority area.
And the slave control unit and/or the master control unit sends the data frame to be sent to the master control unit, and sends the next data frame in the corresponding reporting priority area as the data frame to be sent to give a frame number, until the data frames in the corresponding reporting priority area are all sent or reach the preset sending times, the frame number of the data frame in the next reporting priority area is given and sent.
The frame number of the data frame to be sent is the frame number of the last data frame to be sent by the reporting priority area plus 1.
For example, referring to fig. 6 and fig. 7, for convenience of description, the main control unit sends the data frame to the total control unit, and the reporting priority area of the data buffer area includes a level 1 reporting priority area, a level 2 reporting priority area, and a level 3 reporting priority area.
S11, the main control unit checks the 1-level reporting priority area and judges whether the data frame with the 1-level reporting priority exists or not.
If yes, go to step S12. If not, S19 is executed.
And S12, writing the first sequenced data frame into a frame sequence number, and taking the data frame as a data frame to be sent.
Optionally, the frame number of the data frame to be sent is the frame number of the last data frame to be sent by the level-1 reporting priority region plus 1.
And S13, writing the data frame to be sent into a data sending buffer area, and judging whether the data frame to be sent is written successfully.
If yes, go to step S14. If not, S15 is executed.
Optionally, the data sending buffer area is a data sending buffer area of the main control unit, and the data frame to be sent is sent to the main control unit after being successfully written into the data sending buffer area.
And S14, writing the data frame to be sent into the data backup area.
Optionally, the data frame to be sent is written into the corresponding reporting priority area of the data backup area according to the reporting priority of the data frame to be sent.
And S15, delaying to wait for the data frame to be sent, and executing S13 again.
And S16, judging whether the reporting priority of the last data frame to be sent is the 1-level reporting priority.
If yes, S17 is performed. If not, S11 is executed.
And S17, adding 1 to the cumulative number corresponding to the 1-level reporting priority.
And S18, judging whether the accumulated times Q1 is larger than or equal to the preset sending number.
If yes, go to step S19. If not, S11 is executed.
And S19, clearing the accumulated times Q1, and checking a 2-level reporting priority area.
Referring to fig. 6 (a), steps S11 to S19 define that the data frame in the level 1 reporting priority region is sent as a data frame to be sent, and a frame number is assigned to the data frame. Similarly, the implementation process and principle of giving the data frame in the 2-level reporting priority region as the data frame to be sent a frame number for sending, and the implementation process and principle of giving the data frame in the 3-level reporting priority region as the data frame to be sent a frame number for sending may refer to S11 to S19 and fig. 6 (b) and 6 (c), and are not described herein again.
It should be noted that, in the process of sending the data frame in the 2-level reporting priority region as the data frame to be sent giving the frame number, if the accumulated number of times Q2 is less than the preset sending number and in the process of sending the data frame in the 3-level reporting priority region as the data frame to be sent giving the frame number, after writing the data frame to be sent into the data backup region, S11 is executed to recheck the 1-level reporting priority region, and if there is a frame loss, the data frame of the 1-level reporting priority in the 1-level reporting priority region can be sent in time.
In some embodiments, to avoid frame loss and improve reliability of data transmission, the BMS system data transmission method provided in the embodiment of the present application may further include:
s21, the superior unit receives the data frame to be sent as the current data frame, and judges whether the frame number of the current data frame and the frame number of the last data frame with the same reporting priority are increased progressively continuously.
S22, if not, confirming that the frame loss condition exists, and enabling the upper unit to form a feedback frame by the frame sequence number and the reporting priority of the last data frame with the same reporting priority and return the feedback frame to the lower unit;
and S23, after receiving the feedback frame, the lower unit determines a corresponding number of data frames according to the frame number and the reporting priority in the feedback frame, and re-writes the corresponding number of data frames from the data backup area of the lower unit into the first-ordered position of the corresponding reporting priority area of the data cache area.
The slave control unit, the master control unit and the master control unit are defined as a lower unit and an upper unit. In the relationship between a pair of superior and inferior units, the superior unit is the master unit when the inferior unit is the slave unit. When the lower unit is a main control unit, the upper unit is a master control unit.
Optionally, after receiving the feedback frame, the lower unit determines, according to the reporting priority and the frame number in the feedback frame and the reporting priority and the frame number of the data frame being sent in the data sending buffer, that the data frames in the corresponding number between the feedback frame and the data sending buffer are lost data frames, and rewrites the lost data frames from the data backup area of the lower unit into the first-ranked position of the corresponding reporting priority area of the data buffer, so as to send the lost data frames to the upper unit in time, and then send the lost data frames to the master control unit in time.
By setting the feedback frame, the frame loss condition caused by CAN communication transmission errors CAN be found in time, and the reliability of data transmission is improved.
The BMS data transmission method provided by the embodiment of the application is characterized in that a master control unit issues corresponding quantity reporting parameters to a master control unit or a slave control unit according to the current working condition and the battery characteristics, the master control unit or the slave control unit detects the real-time values of the corresponding data quantity according to the corresponding data quantity reporting parameters, and after the real-time values of the data quantity meet the reporting conditions indicated by the reporting parameters, the real-time values of the data quantity are sent to the master control unit as the reporting values of the data quantity, so that only the reporting values of the data quantity required under the current working condition and the battery characteristics CAN be reported, the reporting time period of the data quantity in the BMS is shortened, the transmission speed is improved, and meanwhile, feedback frames are set, the frame loss condition caused by CAN communication transmission errors CAN be timely found, and the reliability of data transmission is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by functions and internal logic of the process, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (5)
1. The BMS data transmission method is applied to a BMS, and the BMS comprises a master control unit, a plurality of master control units and a plurality of slave control units; the method comprises the following steps:
the master control unit determines a plurality of reported data volumes according to the current working condition and the battery characteristics, and issues corresponding data volume reporting parameters to the master control unit or the slave control unit according to the reported data volumes; the reported data volume corresponds to the slave control unit or the master control unit, and the data volume reporting parameter is used for indicating the reporting condition of the corresponding data volume;
the slave control unit and/or the master control unit receives the corresponding data volume reporting parameters, detects the real-time values of the corresponding data volumes according to the data volume reporting parameters, and sends the real-time values of the data volumes as the reporting values of the data volumes to the master control unit after the real-time values of the data volumes meet the reporting conditions indicated by the corresponding data volume reporting parameters;
the reporting condition comprises an out-of-limit reporting condition and an overtime reporting condition;
after the real-time value of the data volume meets the reporting condition indicated by the corresponding data volume reporting parameter, the slave control unit and/or the master control unit send the real-time value of the data volume as the reporting value of the data volume to the master control unit, including:
the slave control unit and/or the master control unit calculate a first difference value between the real-time value of the data volume and a last reported value of the data volume, and if the first difference value meets an out-of-limit reporting condition indicated by a corresponding data volume reporting parameter, the real-time value of the data volume is used as the reported value of the data volume and sent to the master control unit;
the slave control unit and/or the master control unit calculates a second difference value between the acquisition time of the real-time value of the data volume and the sending time of the last reported value of the data volume, and if the second difference value meets the overtime reporting condition indicated by the corresponding data volume reporting parameter, the real-time value of the data volume is used as the reported value of the data volume and sent to the master control unit;
the method further comprises the following steps:
the master control unit receives the reported value of the data volume and judges whether to adjust the corresponding data volume reporting parameter according to the reported value of the data volume;
if the corresponding data volume reporting parameters need to be adjusted, the master control unit adjusts the corresponding data volume reporting parameters according to the corresponding preset parameters, and sends the adjusted data volume reporting parameters to the corresponding master control unit or the slave control unit, so that the corresponding master control unit or the slave control unit detects the real-time values of the corresponding data volumes according to the adjusted data volume reporting parameters and sends the corresponding data volume reporting values;
the master control unit receives the reported value of the data volume and judges whether to adjust the corresponding data volume reporting parameter according to the reported value of the data volume, and the method comprises the following steps:
the master control unit receives the reported value of the data volume;
the master control unit calculates a third difference value between the reported value of the data volume and the received previous reported value of the corresponding data volume, and calculates a fourth difference value between the receiving time of the reported value of the data volume and the receiving time of the received previous reported value of the corresponding data volume;
the master control unit judges whether to adjust the corresponding data volume reporting parameters or not according to the third difference value, the fourth difference value and preset parameter adjusting conditions;
the data volume reporting parameter is also used for indicating the priority of the corresponding data volume;
the slave control unit and/or the master control unit sends the real-time value of the data volume as the reported value of the data volume to the master control unit, and the method comprises the following steps:
the slave control unit and/or the master control unit frames the reported value of at least one data volume to obtain a data frame, and takes the highest priority in the priorities of the corresponding data volumes in the data frame as the reporting priority of the data frame;
the slave control unit and/or the master control unit writes the data frames into corresponding reporting priority areas of data buffer areas of the slave control unit or the master control unit based on the reporting priority, sends the data frames to the master control unit according to the reporting priority order of the reporting priority areas, and stores the data frames into data backup areas of the slave control unit or the master control unit;
the slave control unit and/or the master control unit sends the data frame to the master control unit according to the priority order of the reported priority area, and the method comprises the following steps:
the slave control unit and/or the master control unit endow a frame sequence number to the data frame which is sequenced first in the corresponding reporting priority area as the data frame to be sent according to the priority sequence from high to low of the reporting priority area; the frame number of the data frame to be sent is the frame number of the last data frame to be sent in the reporting priority area plus 1;
and the slave control unit and/or the master control unit sends the data frames to be sent to the master control unit, gives frame sequence numbers to the next data frame in the corresponding reporting priority area as the data frames to be sent, and sends the data frames until the data frames in the corresponding reporting priority area are all sent or reach the preset sending times, and gives and sends the frame sequence numbers of the data frames in the next reporting priority area.
2. The BMS system data transmission method according to claim 1, wherein the slave control unit is configured to collect and detect real-time values of data amounts of corresponding battery packs and real-time values of data amounts of a plurality of battery cells in the battery packs; the main control unit is used for acquiring and detecting real-time values of data quantity of the corresponding battery clusters;
the receiving, by the slave control unit and/or the master control unit, the corresponding data volume reporting parameter, and detecting a real-time value of the corresponding data volume according to the data volume reporting parameter, includes:
the slave control unit receives at least one corresponding data volume reporting parameter, and detects a real-time value of a corresponding data volume of a corresponding battery pack and/or real-time values of corresponding data volumes of a plurality of single batteries in the battery pack according to each data volume reporting parameter;
and/or the main control unit receives the corresponding at least one data volume reporting parameter and detects the real-time value of the corresponding data volume of the corresponding battery cluster according to each data volume reporting parameter.
3. The BMS system data transmission method according to claim 1, characterized in that the slave control units, the master control unit and the master control unit are defined as subordinate units and superior units; in the relationship between a pair of upper and lower units, when the lower unit is the slave unit, the upper unit is the master unit; when the lower unit is the master control unit, the upper unit is the master control unit; the method further comprises the following steps:
the superior unit receives the data frame to be sent as a current data frame, and judges whether the frame number of the current data frame and the frame number of the last data frame with the same reporting priority are increased progressively and continuously;
if not, confirming that the frame loss condition exists, and enabling the superior unit to form a feedback frame by the frame sequence number and the reporting priority of the last data frame with the same reporting priority and return the feedback frame to the subordinate unit;
and after receiving the feedback frame, the lower unit determines a corresponding number of data frames according to the frame sequence number and the reporting priority in the feedback frame, and re-writes the corresponding number of data frames into a first-ordered position of a corresponding reporting priority area of a data cache area from a data backup area of the lower unit.
4. The BMS system data transmission method according to claim 1, wherein the slave control units are communicatively connected with corresponding master control units, and the master control units are communicatively connected with the master control unit;
the master control unit issues corresponding data volume reporting parameters to the master control unit or the slave control unit according to each reported data volume, and the parameters comprise:
the master control unit sends corresponding data volume reporting parameters to the master control unit according to the reported data volumes;
the master control unit sends the data volume reporting parameters corresponding to the corresponding slave control units in the data volume reporting parameters to the corresponding slave control units;
correspondingly, after the real-time value of the data amount meets the reporting condition, the slave control unit and/or the master control unit send the real-time value of the data amount as the reporting value of the data amount to the master control unit, including:
the slave control unit takes the real-time value of the data volume meeting the reporting condition as the reporting value of the data volume and sends the reporting value to the corresponding master control unit;
the main control unit takes the real-time value of the data volume meeting the reporting condition as the reporting value of the data volume, and sends the reporting value of the data volume corresponding to the received corresponding slave control unit to the master control unit.
5. The BMS system is characterized by comprising a master control unit, a plurality of master control units and a plurality of slave control units; the slave control units are in communication connection with the corresponding main control units, and the main control units are in communication connection with the master control unit;
the slave control unit is used for acquiring and detecting real-time values of data quantities of corresponding battery packs and real-time values of data quantities of a plurality of single batteries in the battery packs;
the main control unit is used for collecting and detecting a real-time value of the data volume of the corresponding battery cluster, and receiving a report value of the data volume of the battery pack and a report value of the data volume of the single battery, which are sent from the control unit;
the master control unit is used for receiving the reported value of the data volume of the battery cluster, the reported value of the data volume of the battery pack and the reported value of the data volume of the single battery which are sent by the corresponding master control unit;
the BMS system performs the BMS system data transmission method of any one of claims 1 to 4.
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