CN113093035A - Method for determining number of battery modules and related device - Google Patents

Method for determining number of battery modules and related device Download PDF

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Publication number
CN113093035A
CN113093035A CN202110399864.5A CN202110399864A CN113093035A CN 113093035 A CN113093035 A CN 113093035A CN 202110399864 A CN202110399864 A CN 202110399864A CN 113093035 A CN113093035 A CN 113093035A
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battery modules
cmu
voltage
determining
battery
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CN202110399864.5A
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CN113093035B (en
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马伟
陈飞
邵俊伟
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a method and a related device for determining battery module data, wherein the online state of BMUs is verified to obtain the online number of BMUs connected with a CMU, then the online number is determined as the initial number of battery modules connected with the CMU, the total voltage of the battery modules corresponding to the initial number is verified to obtain a verification result, and the initial number is determined as the actual number of the battery modules connected with the CMU under the condition that the verification result is a preset verification result. The initial number of the battery modules is determined, then the initial number is verified, and after the verification is passed, the actual number of the battery modules is determined, so that the accuracy of the determined number of the battery modules can be improved, and the accuracy of the CMU for controlling the BMU is further improved.

Description

Method for determining number of battery modules and related device
Technical Field
The invention relates to the field of energy storage, in particular to a method for determining the number of battery modules and a related device.
Background
In the battery management system BMS, a CMU (battery cluster (RACK) -level BMS) is connected to a plurality of battery management units BMUs, each of which is arranged in a battery module PACK to form a battery cluster RACK.
In practical applications, the number of BMUs may be adjusted according to the required power, for example, some BMUs may be removed to adapt to the small required power. When the CMU is powered on, the number of battery modules needs to be accurately identified in order to accurately perform BMU control. Currently, the accuracy of identifying the number of battery modules is low, and further the accuracy of controlling the BMU by the CMU is low.
Disclosure of Invention
In view of this, the present invention provides a method and a related device for determining battery module data, so as to solve the problem that the accuracy of identifying the number of battery modules is low, and further the accuracy of controlling the BMU by the CMU is low.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for determining the number of battery modules is applied to a CMU (Central processing Unit), the CMU is connected with at least one BMU, and the method for determining the number of battery modules comprises the following steps:
verifying the online state of the BMU to obtain the online number of the BMU connected with the CMU;
determining the online number as an initial number of battery modules connected to the CMU;
checking the total voltage of the battery modules corresponding to the initial number to obtain a checking result;
and determining the initial number as the actual number of the battery modules connected with the CMU under the condition that the verification result is a preset verification result.
Optionally, verifying the online status of the BMU to obtain the online number of the BMU connected to the CMU includes:
acquiring basic data and verification data stored in the BMU, wherein the verification data is data obtained by calculating the basic data in a preset verification mode;
calculating the basic data in the preset checking mode to obtain a checking value;
comparing the check value with the check data to obtain a judgment result whether the BMU is on line or not;
and determining the online number of BMUs connected with the CMU corresponding to the judgment result.
Optionally, the obtaining of the basic data and the verification data stored in the BMU includes:
and acquiring the basic data and the verification data stored in the BMU in a daisy chain communication mode.
Optionally, determining the online number of BMUs connected to the CMU corresponding to the determination result includes:
and determining the judgment result as the number of preset judgment results, and determining the number as the online number of the BMUs connected with the CMU.
Optionally, verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result, including:
acquiring total voltage of the battery modules corresponding to the initial number acquired by a plurality of preset acquisition modes;
and checking the total voltage of the battery module to obtain a checking result.
Optionally, the obtaining of the total voltage of the battery modules corresponding to the initial number, which is obtained through a plurality of preset obtaining modes, includes:
acquiring the total voltage of the first battery modules corresponding to the initial number acquired in a voltage acquisition mode;
acquiring total voltage of second battery modules, which is acquired by a PCS (personal communications system) connected with the CMU and corresponds to the initial number;
and acquiring the sum of the cell voltages of the battery modules corresponding to the initial number, and determining the sum as the total voltage of the third battery module.
Optionally, verifying the total voltage of the battery module to obtain a verification result, including:
selecting two total battery module voltages from the first total battery module voltage, the second total battery module voltage and the third total battery module voltage;
calculating a first difference value of the total voltage of the two selected battery modules;
and checking whether the first difference value is within a first preset voltage difference value interval or not to obtain a checking result.
Optionally, verifying the total voltage of the battery module to obtain a verification result, including:
calculating a second difference between the total voltage of the third battery module and the total voltage of the first battery module;
and under the condition that the second difference value is within a second preset voltage difference value interval, verifying the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module to obtain a verification result.
Optionally, verifying a voltage difference between the total voltage of the first battery module and the total voltage of the second battery module to obtain a verification result, including:
calculating a third difference between the total voltage of the first battery module and the total voltage of the second battery module;
under the condition that the third difference value is within a third preset voltage difference value interval, determining that the verification result is a first identifier; the first identifier represents that the verification is passed;
under the condition that the third difference value is not within a third preset voltage difference value interval, determining that the verification result is a second identifier; the second identification represents that the verification fails.
Optionally, when the third difference is within a third preset voltage difference interval, before determining that the verification result is the first identifier, the method further includes:
and calculating the maximum sampling error and the minimum total pressure of the battery module according to a preset voltage difference value interval calculation mode to obtain a third preset voltage difference value interval.
Optionally, in a case that the verification result is a preset verification result, determining the initial number as an actual number of battery modules of the battery modules connected to the CMU includes:
and determining the initial number as the actual number of the battery modules connected with the CMU under the condition that the verification result is the first identifier.
Optionally, when the verification result is the second identifier, the method further includes:
outputting the quantity determination failure information.
A determination apparatus of the number of battery modules, applied to a CMU, the CMU being connected to at least one BMU, the determination apparatus comprising:
a first quantity determining module, configured to verify an online status of the BMUs to obtain an online quantity of the BMUs connected to the CMU;
a second number determination module for determining the online number as an initial number of battery modules connected to the CMU;
the voltage checking module is used for checking the total voltage of the battery modules corresponding to the initial number to obtain a checking result;
and a third number determining module, configured to determine the initial number as an actual number of battery modules of the battery modules connected to the CMU, if the check result is a preset check result.
A storage medium including a stored program, wherein the program executes the above-described method of determining the number of battery modules.
A CMU, comprising: a memory and a processor;
wherein the memory is used for storing programs;
the processor calls a program and is used for executing the method for determining the number of the battery modules.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method and a related device for determining battery module data, wherein the online state of BMUs is verified to obtain the online number of BMUs connected with a CMU, then the online number is determined as the initial number of battery modules connected with the CMU, the total voltage of the battery modules corresponding to the initial number is verified to obtain a verification result, and the initial number is determined as the actual number of the battery modules connected with the CMU under the condition that the verification result is a preset verification result. The initial number of the battery modules is determined, then the initial number is verified, and after the verification is passed, the actual number of the battery modules is determined, so that the accuracy of the determined number of the battery modules can be improved, and the accuracy of the CMU for controlling the BMU is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only 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 flowchart of a method for determining the number of battery modules according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for determining the number of battery modules according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for determining the number of battery modules according to another embodiment of the present invention;
fig. 4 is a communication architecture diagram of a BMS system according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for determining the number of battery modules according to another embodiment of the present invention;
fig. 6 is a flowchart of a method of determining the number of battery modules according to a fifth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a device for determining the number of battery modules according to an embodiment of the present invention.
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.
Fig. 1 shows a block diagram of a battery management system BMS, mainly including the following structure:
BMU: the PACKBMS is built in the PACK and has the functions of cell voltage and temperature sampling, passive equalization and the like, the software-free design is adopted, and the communication and control functions are realized through a differential UART daisy chain.
CMU: the RACKBMS is arranged in the switch box and has the functions of SOC calculation, PACKBMS control, main power circuit on-off control and the like. Wherein RACK is a battery cluster.
SMU (system level BMS): the system MBMS is built in the direct current power distribution cabinet and has the functions of environment monitoring (matching), RACK BMS control and main power circuit on-off control.
In the BMS system, the communication architecture is divided into a three-level architecture, wherein the first-level architecture is an SMU (simple message unit), the second-level architecture is a CMU (micro-processing unit), and the third-level architecture is a BMU (BMU). A CMU will connect a plurality of battery management units BMU, and each BMU sets up in a battery module PACK, and a plurality of battery modules PACK connect in series, constitute a battery cluster RACK. The SMU can communicate with a CMU in the battery cluster, which can communicate with a BMU inside the battery module.
More specifically:
a battery module PACK is parallelly connected or series connection is constituteed by a plurality of electric cores, and BMU in the PACK is responsible for the voltage of all electric cores in the sampling PACK to and the temperature point of arranging in the sampling PACK, carry out the equilibrium to the electric core in the PACK under certain condition.
A plurality of battery modules PACK are connected in series to form a battery cluster RACK, a CMU is arranged in the RACK, and the CMU has the main functions of collecting the total voltage and the total current after the PACK is connected in series, controlling the on-off of relays (P + and P-), calculating the SOC (state of charge) and the like.
And voltage and current after the RACKs are connected in parallel are supplied to a Process Control System (PCS) through a BCP (binary-coded positive-phase positive) combiner cabinet, so that the energy storage and power distribution conversion of a power grid and a photovoltaic system is realized. The BCP is internally provided with the SMU, and the main function of the BCP is to collect information of voltage, current, temperature and the like of the multiple CMUs and then summarize the information to the PCS controller.
And the PCS controller interacts with an energy management unit EMS to realize the control requirement with a terminal client.
The LC in fig. 1 is a local controller, and is a device which is responsible for managing the SMU device of the lower computer and receiving scheduling control of devices such as the EMS of the upper computer;
the PC, i.e., the local computer, is responsible for receiving the EMS data and displaying and storing the sampled data.
A power control circuit: and the hardware circuit realizes the conversion between the direct current of the battery end and the alternating current of the user end.
The number of battery modules in fig. 1 may be configured according to actual use requirements, such as use environment and energy requirements. If a high-voltage single module of a certain system is 3.2kWh, the model of the product is actually formed according to the difference of the number of the modules as shown in Table 1. The products of different models are different in the number of battery modules in software, and the number of the battery modules can be set through the software to be suitable for all models of products.
TABLE 1
Model number Battery module Dial switch Software version
A1 3 1 1
A2 4 2 2
A3 5 3 3
A4 6 4 4
A5 7 5 5
A6 8 6 6
As can be seen from table 1, in practical applications, the number of the battery modules may be configured, and the CMU determines a total voltage threshold, such as a total voltage high threshold and a total voltage low threshold, according to the total voltage of the battery modules, and then compares the total voltage threshold with the total voltage of the collected battery modules, determines an operation state of the total voltage of the battery modules, and performs corresponding fault protection.
Since the total voltage range of RACK is determined by the number of battery modules and the number of cells built in the BMUs, the CMU needs to determine the number of battery modules in order to determine the total voltage of the battery modules, wherein in this embodiment, the determined number of battery modules is also the number of BMUs since one battery module is configured with one BMU.
In order to realize the number of the battery modules, the inventor has found through research that a hardware dial switch can be added, the setting of the dial switch is read when the CMU is powered on every time, and then the number of the battery modules is identified according to an agreed rule.
However, in this method, the number of the battery modules needs to be manually determined, and then the value of the dial switch is adjusted, and referring to table 1, if the number of the battery modules is 3, the value of the dial switch is adjusted to 1. If the number of the battery modules is 4, the numerical value of the dial switch is adjusted to 2.
The dial switch is easily damaged along with the increase of the operation times or improper operation due to the manual operation required by the mode of setting the dial switch. In addition, the manual operation is less accurate. The dial switch is added, the hardware cost is high, and in addition, the waterproof function of the dial switch is required to be configured, so that the realization is complex.
In order to solve the problems caused by the manual operation of the dial switch, the inventor finds that the number of the battery modules can be set when the battery module leaves a factory, and then the corresponding software version is configured, so that the number of the battery modules is fixed, the number of the battery modules cannot be adjusted at will, and the flexibility is poor.
For this reason, the inventors have studied and found that the online number of BMUs in a battery module can be determined during the use of the battery module, and then the final number of battery modules can be obtained by checking the online number. Therefore, the number of the battery modules can be determined in an automatic mode, manual work is not needed, and the problem of low accuracy caused by manual misoperation is solved. In addition, hardware such as a dial switch is not required to be arranged, and cost is saved. In addition, the number of the battery modules can be adjusted at will, and the flexibility is good.
More specifically, in the present invention, the online status of the BMU is verified to obtain the online number of the BMUs connected to the CMU, then the online number is determined as the initial number of the battery modules connected to the CMU, the total voltage of the battery modules corresponding to the initial number is verified to obtain a verification result, and if the verification result is a preset verification result, the initial number is determined as the actual number of the battery modules connected to the CMU. The initial number of the battery modules is determined, then the initial number is verified, and after the verification is passed, the actual number of the battery modules is determined, so that the accuracy of the determined number of the battery modules can be improved, and the accuracy of the CMU for controlling the BMU is further improved.
The whole working process comprises the steps that firstly, CMU identifies the quantity of BMUs through daisy chain communication, then the sum of the total pressure of the collected RACK and the identified voltage of the PACK is compared, the quantity of the modules is confirmed after verification is passed, then the relay of the RACK is closed, the total pressure of the RACK is connected to the input end of a PCS, and then the voltage of the PCS end is collected by a controller of the PCS. CMU obtains the voltage of PCS end through communicating with PCS controller, then compares with total pressure warp of RACK end that self gathered, after verifying, confirms module quantity once more, and the system normally works. At this time, the PCS control can charge and discharge RACK.
On the basis of the above, an embodiment of the present invention provides a method for determining the number of battery modules, which is characterized in that the method is applied to a CMU, and the CMU is connected to at least one BMU.
Referring to fig. 2, the method of determining the number of battery modules may include:
s11, checking the online state of the BMUs to obtain the online number of the BMUs connected with the CMU.
In practical applications, the BMS system is provided with locations where a plurality of battery modules can be mounted, and at each location, the battery module can be selectively placed or not placed. For example, assume that a total of 10 battery module locations are provided, but in practical applications, only 6 battery modules are needed, so there are 4 locations where no battery module is placed. In this embodiment, the battery modules PACK in the RACK of the battery cluster are sequentially connected in series.
In this embodiment, it is necessary to determine how many battery modules are in the battery cluster. In an actual use process, if the BMU exists, the BMU may communicate with the CMU, and the CMU may check whether the BMU is online based on data stored in a configuration register in the BMU, and if the BMU can acquire the data stored in the configuration register and the check is passed, it indicates that the BMU is online. Therefore, in this embodiment, the number of online BMUs can be obtained according to the number of verification passes.
Specifically, referring to fig. 3, step S11 may include:
and S21, acquiring basic data and verification data stored in the BMU, wherein the verification data is data obtained by calculating the basic data in a preset verification mode.
In practical applications, the CMU first empties the read data buffer and then initializes the number of online BMUs to 0. Then, reading a configuration register of the BMU chip by the maximum number of BMUs to obtain basic data and check data stored in the configuration register, wherein the check data is obtained by calculating the basic data in a preset check mode (such as a CRC check mode).
Fig. 4 may be referred to as a communication method between the CMU and the BMU. And a daisy chain communication mode is adopted between the CMU and the BMU to acquire the basic data and the verification data stored in the BMU.
And S22, calculating the basic data through the preset verification mode to obtain a verification value.
Specifically, the basic data may be calculated by using the CRC check method to obtain a check value.
And S23, comparing the check value with the check data to obtain a judgment result whether the BMU is on line.
Since the check value and the check data are obtained by calculating the same basic data in a CRC check manner, theoretically, the check value and the check data should be the same.
In this embodiment, if the verification value is the same as the verification data, it is determined that the BMU is online, and if the verification value is different from the verification data, it is determined that the BMU is not online.
And S24, determining the online number of the BMUs connected with the CMU corresponding to the judgment result.
In practical application, the number of the judgment results is determined as the preset judgment results (online), and the online number of the BMUs connected with the CMU is determined.
It should be noted that, when determining whether the BMU is online, the CMU sequentially determines each BMU. In this embodiment, the determination result is the number of passing BMUs, which is the online number of BMUs.
In this embodiment, that is, the set verification level 1, specifically, the CMU communicates with the BMU in a daisy chain manner, and the verification data in the configuration register of the BMU acquisition chip and the verification value obtained by calculation are used to perform non-alignment, so as to confirm the number of the BMU chips in the module.
And S12, determining the online number as the initial number of the battery modules connected with the CMU.
According to the above discussion, one BMU is provided in each battery module, so the online number of BMUs is the initial number of battery modules connected to the CMU.
And S13, verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result.
In practical application, the total voltage of the battery modules can be acquired in multiple ways, specifically, the total voltage of the battery modules corresponding to the initial number acquired through multiple preset acquisition ways is acquired, and then the total voltage of the battery modules is verified to obtain a verification result.
In this embodiment, acquiring the total voltage of the battery modules corresponding to the initial number, which is acquired through a plurality of preset acquisition modes, may include:
1) and acquiring the total voltage of the first battery modules corresponding to the initial quantity acquired in a voltage acquisition mode.
Referring to fig. 4, the CMU may acquire the total voltage of all online battery modules in a manner of sampling the total voltage of the battery terminals, which is referred to as the total voltage of the first battery module in this embodiment. Namely, the total voltage Vb of the first battery module corresponding to the initial number is collected.
2) And acquiring the total voltage of the second battery modules, which is acquired by the PCS system connected with the CMU and corresponds to the initial number.
Referring to fig. 4, CMU can communicate with PCS system, in practical application, some battery clusters RACK in battery management system BMS are not connected in parallel, PCS terminal voltage is equal to RACK voltage, and some battery clusters RACK in battery management system BMS are connected in parallel, but when they are connected in parallel, only RACK with smaller voltage difference is connected in parallel, so that difference between the parallel PCS terminal voltage and any RACK voltage is not large, and then the parallel voltage can be used as total RACK voltage. And acquiring a total voltage sampling value of the PCS end, namely the total voltage Vp of the second battery module corresponding to the initial number.
3) And acquiring the sum of the cell voltages of the battery modules corresponding to the initial number, and determining the sum as the total voltage of the third battery module.
Specifically, the CMU may invoke daisy chain communication to communicate with the online BMUs, obtain the cell voltages of the battery modules where each BMU is located, and then calculate the sum Vs of the cell voltages to obtain the total voltage of the third battery module.
And S14, determining the initial number as the actual number of the battery modules connected with the CMU under the condition that the verification result is a preset verification result.
In this embodiment, the preset verification result may be a first identifier, such as 1, representing that the verification passes. If the verification passes, it is determined that the determined initial number is correct, and at this time, the initial number is determined as the actual number of battery modules of the battery modules connected to the CMU, that is, the actual number of battery modules in the BMS system can be obtained.
In this embodiment, the online status of the BMU is verified to obtain the online number of the BMUs connected to the CMU, then the online number is determined as the initial number of the battery modules connected to the CMU, the total voltage of the battery modules corresponding to the initial number is verified to obtain a verification result, and the initial number is determined as the actual number of the battery modules connected to the CMU when the verification result is a preset verification result. The initial number of the battery modules is determined, then the initial number is verified, and after the verification is passed, the actual number of the battery modules is determined, so that the accuracy of the determined number of the battery modules can be improved, and the accuracy of the CMU for controlling the BMU is further improved.
In addition, the invention adopts software to automatically identify without adding dial switch and waterproof and dustproof measures, thus reducing hardware cost. Manual dialing and software setting are not needed, power-on automatic identification is achieved, and operation is simple.
In the above embodiment, the specific implementation process of the method for verifying the total voltage of the battery module to obtain the verification result is described, and there are two implementation manners.
1. The first implementation mode comprises the following steps:
referring to fig. 5, verifying the total voltage of the battery module to obtain a verification result includes:
and S31, selecting two total battery module voltages from the total first battery module voltage, the total second battery module voltage and the total third battery module voltage.
In practical applications, two may be selected at random, such as selecting the total voltage of the first and third battery modules. The selection may also be performed according to a preset selection rule, such as selecting two voltages with larger voltage values, or selecting two voltages with smaller voltage values.
And S32, calculating a first difference value of the total voltage of the two selected battery modules.
And S33, checking whether the first difference value is within a first preset voltage difference value interval to obtain a checking result.
In practical application, if a first difference value of total voltages of two battery modules is within a first preset voltage difference value interval, the determined initial number passes verification, and the verification result is determined to be a first identifier; the first identification represents that the verification is passed.
If the first difference value of the total voltages of the two battery modules is not within the first preset voltage difference value interval, the determined initial quantity check is passed, and the check result is determined to be a second identifier; the first identification represents that the verification fails.
2. The second implementation mode comprises the following steps:
referring to fig. 6, verifying the total voltage of the battery module to obtain a verification result includes:
and S41, calculating a second difference value between the total voltage of the third battery module and the total voltage of the first battery module.
In practical application, before calculating the second difference value between the total voltage of the third battery module and the total voltage of the first battery module, the CMU needs to call the daisy chain communication function module for multiple times to return the online number of the BMUs, the number returned for multiple times (three times in this example) needs to be consistent and is within a reasonable range, otherwise, the judgment is finished, and the return fails. If the number of returns must be consistent and within a reasonable range, step S41 is executed to calculate the difference between the total voltage Vs of the third battery module and the total voltage Vb of the first battery module.
And S42, calculating a third difference value of the total voltage of the first battery module and the total voltage of the second battery module under the condition that the second difference value is within a second preset voltage difference value interval.
The second preset voltage difference interval and the first preset voltage difference interval are set by technicians according to specific use scenes.
And when the second difference is within a second preset voltage difference interval, it is indicated that the initial number check is passed, and at this time, a third difference between the first battery module total voltage Vb and the second battery module total voltage Vp is calculated.
S43, judging whether the third difference value is within a third preset voltage difference value interval or not; if yes, go to step S44; if not, go to step S45.
In practical application, before determining whether the third difference is within the third preset voltage difference interval, the third preset voltage difference interval needs to be determined.
Specifically, according to a preset voltage difference value interval calculation mode, the maximum sampling error and the minimum total pressure of the battery module are calculated, and a third preset voltage difference value interval is obtained.
In detail, in the third preset voltage difference interval, the minimum value cannot be lower than the maximum sampling error, and the maximum value cannot be greater than the minimum total pressure of one battery module.
The maximum error of sampling of the single cell is equal to the maximum error of sampling of the single cell and the number of the single cells;
example (c): the total pressure sampling precision of the system is +/-3V (0-600V), and the maximum sampling error is 6V.
The system adopts a FAE chip to sample the voltage of the single battery cell, and the chip data manual and the actual project test confirm that the maximum sampling error is less than 3mV, and the maximum number of the single battery cells of the system is 160, so that the maximum sampling error of the single battery cell is less than 160X 3 and is 480 mV;
the minimum total voltage of the battery module is equal to the lowest voltage of the single battery cell and the number of the single battery cells of the battery module;
example (c): normally, the use range of the voltage of the single battery cell is 2.0V-3.65V, and the system designs 20 single battery cells of one battery module, namely the minimum total voltage of the battery module is 2.0 × 20 — 40V;
from the above analysis, it is only necessary that the differential pressure threshold is set within a range of more than 6V and less than 40V. The practical situation is about half of the minimum total pressure of the battery module, namely 20V is reasonable.
S44, determining the verification result as a first identifier; the first identification represents that the verification is passed.
If the third difference is within the third preset voltage difference interval, the verification is passed, and the verification result is the first identifier.
And S45, determining that the checking result is a second identifier, wherein the second identifier represents that the checking fails.
If the third difference is not in the third preset voltage difference interval, the verification is not passed, and the verification result is the second identifier.
It should be noted that, in the above, "calculating a third difference between the total voltage of the first battery module and the total voltage of the second battery module, when the third difference is within a third preset voltage difference interval, determining that the verification result is the first identifier; the first identifier representation passes verification, and when the third difference value is not within a third preset voltage difference value interval, the verification result is determined to be a second identifier; the second identifier represents a specific implementation manner that the verification fails to pass "yes" to verify the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module to obtain a verification result ", and in addition, other specific processes for achieving" verifying the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module to obtain a verification result "are also within the protection scope of the invention.
In addition, a verify level 2 and a verify level 3 are provided in the present embodiment, where:
checking a level 2: and the CMU acquires the total voltage of the battery end and the verification of the total voltage of the single body fed back by the daisy chain communication through AD sampling.
Checking a level 3: CMU communicates with PCS through CAN, obtains total pressure that PCS sampled and total pressure that battery end sampled and carries through the comparison, realizes the check-up of ad hoc network module quantity.
In this embodiment, the verification level 1 is executed first, then the verification level 2 is executed, and finally the verification level 3 is executed, and if all the verification levels of 3 pass, it indicates that the determined initial number is correct, and the determined initial number may be used as the number of the battery modules connected to the CMU.
Specifically, when the verification result is a preset verification result, determining the initial number as the actual number of the battery modules connected to the CMU includes:
and determining the initial number as the actual number of the battery modules connected with the CMU under the condition that the verification result is the first identifier.
And under the condition that the verification result is the second identifier, the initial quantity at the moment is not the actual quantity of the battery modules connected with the CMU, and quantity determination failure information is output at the moment, such as the quantity determination failure information can be output to a user terminal, so that a user can know the condition of the quantity determination of the battery modules in time.
Except that the check result is the second identifier when the third difference value is not within the third preset voltage difference value interval, the number of the lines returned to the BMU by calling the daisy chain communication function module for multiple times by the CMU is different, or the number of the lines returned to the BMU by calling the daisy chain communication function module for multiple times by the CMU is the same, but is not within a reasonable range, the determination of the number of the battery modules is considered to be failed.
In this embodiment, the value of the initial number is checked by using a system networking technology (daisy chain) and a three-level software checking algorithm, and after the initial number passes the checking, the final number of the battery modules is automatically determined, so that the risk of system operation caused by module identification errors is reduced, and the reliability of the system is improved.
In addition to the above, the number of battery modules may be determined, and in the embodiment of the present invention, when the number of battery modules cannot be determined normally, what reason causes the number of battery modules to be determined normally may be further determined.
Specifically, the cases of erroneous recognition or unsuccessful recognition that may occur during the automatic recognition of the number of BMUs are listed as follows, and a corresponding processing method is adopted for each case.
1. A daisy chain communication failure;
aiming at the daisy chain communication failure, under the condition that the total pressure sampling link is normal, the automatic identification failure can be judged by the following two channels.
The CMU calls the daisy chain communication function module for multiple times to return different online quantities of the BMUs, or the CMU calls the daisy chain communication function module for multiple times to return the same online quantities of the BMUs but not in a reasonable range, or the second difference value is not in a second preset voltage difference value interval.
2. Total pressure sampling error;
for total pressure sampling link failure, the automatic identification failure can be judged by the following two channels.
The second difference is not within the second preset voltage difference interval or the third difference is not within the third preset voltage difference interval.
3. Daisy chain communication failures and total pressure sampling errors;
for the situation that daisy chain communication failure and total pressure sampling error exist simultaneously, automatic identification failure can be judged through the following three channels.
The CMU calls the daisy chain communication function module for multiple times to return different online quantities of the BMUs, or the CMU calls the daisy chain communication function module for multiple times to return the same online quantity of the BMUs but not in a reasonable range, or the second difference value is not in the second preset voltage difference value interval, or the third difference value is not in the third preset voltage difference value interval.
Optionally, on the basis of the above embodiment of the method for determining the number of battery modules, another embodiment of the present invention provides a device for determining the number of battery modules, which is applied to a CMU, the CMU being connected to at least one BMU, and the device for determining the number of battery modules includes:
a first quantity determining module 11, configured to verify an online status of the BMU to obtain an online quantity of BMUs connected to the CMU;
a second number determination module 12 for determining the online number as an initial number of battery modules connected to the CMU;
the voltage checking module 13 is configured to check the total voltage of the battery modules corresponding to the initial number to obtain a checking result;
a third number determining module 14, configured to determine the initial number as an actual number of battery modules of the battery modules connected to the CMU if the checking result is a preset checking result.
Further, the first number determination module 11 includes:
the data acquisition submodule is used for acquiring basic data and verification data stored in the BMU, and the verification data is data obtained by calculating the basic data in a preset verification mode;
the data calculation submodule is used for calculating the basic data through the preset verification mode to obtain a verification value;
the data comparison submodule is used for comparing the check value with the check data to obtain a judgment result whether the BMU is on line or not;
and the quantity determining sub-module is used for determining the online quantity of the BMUs connected with the CMU corresponding to the judgment result.
Further, the data acquisition sub-module is specifically configured to:
and acquiring the basic data and the verification data stored in the BMU in a daisy chain communication mode.
Further, the quantity determination submodule is specifically configured to:
and determining the judgment result as the number of preset judgment results, and determining the number as the online number of the BMUs connected with the CMU.
Further, the voltage verification module 13 includes:
the voltage acquisition submodule is used for acquiring the total voltage of the battery modules corresponding to the initial number acquired by a plurality of preset acquisition modes;
and the checking submodule is used for checking the total voltage of the battery module to obtain a checking result.
Further, the voltage acquisition submodule is specifically configured to:
acquiring the total voltage of the first battery modules corresponding to the initial number acquired in a voltage acquisition mode;
acquiring total voltage of second battery modules, which is acquired by a PCS (personal communications system) connected with the CMU and corresponds to the initial number;
and acquiring the sum of the cell voltages of the battery modules corresponding to the initial number, and determining the sum as the total voltage of the third battery module.
Further, the check submodule is specifically configured to:
selecting two total battery module voltages from the first total battery module voltage, the second total battery module voltage and the third total battery module voltage;
calculating a first difference value of the total voltage of the two selected battery modules;
and checking whether the first difference value is within a first preset voltage difference value interval or not to obtain a checking result.
Further, the check submodule includes:
the difference value calculation submodule is used for calculating a second difference value between the total voltage of the third battery module and the total voltage of the first battery module;
and the checking unit is used for checking the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module under the condition that the second difference value is within a second preset voltage difference value interval to obtain a checking result.
Further, the inspection unit is specifically configured to:
calculating a third difference between the total voltage of the first battery module and the total voltage of the second battery module;
under the condition that the third difference value is within a third preset voltage difference value interval, determining that the verification result is a first identifier; the first identifier represents that the verification is passed;
under the condition that the third difference value is not within a third preset voltage difference value interval, determining that the verification result is a second identifier; the second identification represents that the verification fails.
Further, still include:
and the difference interval determining unit is used for calculating the maximum sampling error and the minimum total pressure of the battery module according to a preset voltage difference interval calculating mode to obtain a third preset voltage difference interval.
Further, the third quantity determining module 14 is specifically configured to:
and determining the initial number as the actual number of the battery modules connected with the CMU under the condition that the verification result is the first identifier.
Further, still include:
and the information output module is used for outputting the quantity determination failure information under the condition that the verification result is the second identifier.
In this embodiment, the online status of the BMU is verified to obtain the online number of the BMUs connected to the CMU, then the online number is determined as the initial number of the battery modules connected to the CMU, the total voltage of the battery modules corresponding to the initial number is verified to obtain a verification result, and the initial number is determined as the actual number of the battery modules connected to the CMU when the verification result is a preset verification result. The initial number of the battery modules is determined, then the initial number is verified, and after the verification is passed, the actual number of the battery modules is determined, so that the accuracy of the determined number of the battery modules can be improved, and the accuracy of the CMU for controlling the BMU is further improved.
It should be noted that, for the working processes of each module, sub-module, and unit in this embodiment, please refer to the corresponding description in the above embodiments, which is not described herein again.
Optionally, on the basis of the embodiments of the method and the device for determining the number of battery modules, another embodiment of the present invention provides a storage medium, where the storage medium includes a stored program, and the program executes the method for determining the number of battery modules.
Optionally, on the basis of the embodiments of the method and the apparatus for determining the number of battery modules, another embodiment of the present invention provides a CMU, including: a memory and a processor;
wherein the memory is used for storing programs;
the processor calls a program and is used for executing the method for determining the number of the battery modules.
In this embodiment, the online status of the BMU is verified to obtain the online number of the BMUs connected to the CMU, then the online number is determined as the initial number of the battery modules connected to the CMU, the total voltage of the battery modules corresponding to the initial number is verified to obtain a verification result, and the initial number is determined as the actual number of the battery modules connected to the CMU when the verification result is a preset verification result. The initial number of the battery modules is determined, then the initial number is verified, and after the verification is passed, the actual number of the battery modules is determined, so that the accuracy of the determined number of the battery modules can be improved, and the accuracy of the CMU for controlling the BMU is further improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. A method for determining the number of battery modules, applied to a CMU connected to at least one BMU, the method comprising:
verifying the online state of the BMU to obtain the online number of the BMU connected with the CMU;
determining the online number as an initial number of battery modules connected to the CMU;
checking the total voltage of the battery modules corresponding to the initial number to obtain a checking result;
and determining the initial number as the actual number of the battery modules connected with the CMU under the condition that the verification result is a preset verification result.
2. The method according to claim 1, wherein the checking the online status of the BMU to obtain the online number of BMUs connected to the CMU comprises:
acquiring basic data and verification data stored in the BMU, wherein the verification data is data obtained by calculating the basic data in a preset verification mode;
calculating the basic data in the preset checking mode to obtain a checking value;
comparing the check value with the check data to obtain a judgment result whether the BMU is on line or not;
and determining the online number of BMUs connected with the CMU corresponding to the judgment result.
3. The method of claim 2, wherein obtaining the base data and the verification data stored in the BMU comprises:
and acquiring the basic data and the verification data stored in the BMU in a daisy chain communication mode.
4. The method according to claim 2, wherein determining the online number of BMUs connected to the CMU corresponding to the determination result includes:
and determining the judgment result as the number of preset judgment results, and determining the number as the online number of the BMUs connected with the CMU.
5. The method of claim 1, wherein verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result comprises:
acquiring total voltage of the battery modules corresponding to the initial number acquired by a plurality of preset acquisition modes;
and checking the total voltage of the battery module to obtain a checking result.
6. The method for determining according to claim 5, wherein obtaining the total voltage of the battery modules corresponding to the initial number obtained through a plurality of preset obtaining modes comprises:
acquiring the total voltage of the first battery modules corresponding to the initial number acquired in a voltage acquisition mode;
acquiring total voltage of second battery modules, which is acquired by a PCS (personal communications system) connected with the CMU and corresponds to the initial number;
and acquiring the sum of the cell voltages of the battery modules corresponding to the initial number, and determining the sum as the total voltage of the third battery module.
7. The method of claim 6, wherein verifying the total voltage of the battery module to obtain a verification result comprises:
selecting two total battery module voltages from the first total battery module voltage, the second total battery module voltage and the third total battery module voltage;
calculating a first difference value of the total voltage of the two selected battery modules;
and checking whether the first difference value is within a first preset voltage difference value interval or not to obtain a checking result.
8. The method of claim 6, wherein verifying the total voltage of the battery module to obtain a verification result comprises:
calculating a second difference between the total voltage of the third battery module and the total voltage of the first battery module;
and under the condition that the second difference value is within a second preset voltage difference value interval, verifying the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module to obtain a verification result.
9. The method of claim 8, wherein verifying the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module to obtain a verification result comprises:
calculating a third difference between the total voltage of the first battery module and the total voltage of the second battery module;
under the condition that the third difference value is within a third preset voltage difference value interval, determining that the verification result is a first identifier; the first identifier represents that the verification is passed;
under the condition that the third difference value is not within a third preset voltage difference value interval, determining that the verification result is a second identifier; the second identification represents that the verification fails.
10. The method according to claim 9, wherein before determining that the verification result is the first identifier if the third difference is within a third preset voltage difference interval, the method further comprises:
and calculating the maximum sampling error and the minimum total pressure of the battery module according to a preset voltage difference value interval calculation mode to obtain a third preset voltage difference value interval.
11. The determination method according to claim 9, wherein determining the initial number as an actual number of battery modules of the battery module connected to the CMU in a case where the check result is a preset check result includes:
and determining the initial number as the actual number of the battery modules connected with the CMU under the condition that the verification result is the first identifier.
12. The method according to claim 9, wherein if the verification result is the second identifier, the method further includes:
outputting the quantity determination failure information.
13. An apparatus for determining the number of battery modules, applied to a CMU, the CMU being connected to at least one BMU, the apparatus comprising:
a first quantity determining module, configured to verify an online status of the BMUs to obtain an online quantity of the BMUs connected to the CMU;
a second number determination module for determining the online number as an initial number of battery modules connected to the CMU;
the voltage checking module is used for checking the total voltage of the battery modules corresponding to the initial number to obtain a checking result;
and a third number determining module, configured to determine the initial number as an actual number of battery modules of the battery modules connected to the CMU, if the check result is a preset check result.
14. A storage medium characterized by comprising a stored program, wherein the program executes the method for determining the number of battery modules according to any one of claims 1 to 12.
15. A CMU, comprising: a memory and a processor;
wherein the memory is used for storing programs;
the processor calls a program and is used to perform the method for determining the number of battery modules according to any one of claims 1 to 12.
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