CN113093035B - 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
CN113093035B
CN113093035B CN202110399864.5A CN202110399864A CN113093035B CN 113093035 B CN113093035 B CN 113093035B CN 202110399864 A CN202110399864 A CN 202110399864A CN 113093035 B CN113093035 B CN 113093035B
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Prior art keywords
total voltage
battery modules
battery
cmu
determining
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CN113093035A (en
Inventor
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]

Abstract

The invention provides a method for determining battery module data and a related device, wherein in the method, the online state of a BMU is checked to obtain the online quantity of the BMU connected with the CMU, then the online quantity is determined as the initial quantity of battery modules connected with the CMU, the total voltage of the battery modules corresponding to the initial quantity is checked to obtain a checking result, and the initial quantity is determined as the actual battery module quantity of the battery modules connected with the CMU under the condition that the checking result is a preset checking result. The invention firstly determines the initial number of the battery modules, then checks the initial number, and determines the actual number of the battery modules after the initial number passes the check, thereby improving the accuracy of the determined number of the battery modules and further improving the accuracy of the CMU on BMU control.

Description

Method for determining number of battery modules and related device
Technical Field
The present invention relates to the field of energy storage, and more particularly, to a method for determining the number of battery modules and a related apparatus.
Background
In a battery management system BMS, a CMU (battery cluster (RACK) level BMS) is connected to a plurality of battery management units BMU, and each BMU is disposed in a battery module PACK to form a battery cluster RACK.
In practice, the number of BMUs may be adjusted according to the required power, such as by removing some BMUs to accommodate a smaller 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 thus the accuracy of the CMU to BMU control is low.
Disclosure of Invention
In view of the above, the present invention provides a method and related apparatus for determining battery module data, so as to solve the problem that the accuracy of identifying the number of battery modules is low, and thus 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, applied to a CMU, the CMU being connected to at least one BMU, the method comprising:
checking the online state of the BMU to obtain the online quantity of the BMU connected with the CMU;
determining the on-line number as an initial number of battery modules connected to the CMU;
the total voltage of the battery modules corresponding to the initial number is checked to obtain a checking result;
and under the condition that the verification result is a preset verification result, determining the initial number as the actual number of battery modules connected with the CMU.
Optionally, verifying the online status of the BMU to obtain the online number of BMUs connected to the CMU, including:
basic data and check data stored in the BMU are obtained, wherein the check data are obtained by calculating the basic data in a preset check mode;
calculating the basic data in the preset verification mode to obtain a verification value;
comparing the check value with the check data to obtain a judging result of whether the BMU is on line or not;
and determining the online quantity of the BMU connected with the CMU, which corresponds to the judging result.
Optionally, acquiring 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 through 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 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 the total voltage of the battery modules corresponding to the initial number acquired through a plurality of preset acquisition modes;
And verifying the total voltage of the battery module to obtain a verification result.
Optionally, acquiring the total voltage of the battery modules corresponding to the initial number acquired through a plurality of preset acquisition modes includes:
acquiring the total voltage of the first battery modules corresponding to the initial quantity acquired in a voltage acquisition mode;
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;
and obtaining 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, the checking the total voltage of the battery module to obtain a checking result includes:
selecting two battery module total voltages from the first battery module total voltage, the second battery module total voltage, and the third battery module total voltage;
calculating a first difference value of the total voltages of the two selected battery modules;
and checking whether the first difference value is in a first preset voltage difference value interval or not to obtain a checking result.
Optionally, the checking the total voltage of the battery module to obtain a checking result includes:
calculating a second difference between the third battery module total voltage and the first battery module total voltage;
And under the condition that the second difference value is in 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 first battery module total voltage and the second battery module total voltage to obtain a verification result, including:
calculating a third difference between the first battery module total voltage and the second battery module total voltage;
determining that the verification result is a first identifier under the condition that the third difference value is in a third preset voltage difference value interval; the first identifier represents that the verification passes;
determining that the verification result is a second identifier when the third difference value is not in a third preset voltage difference value interval; the second identity characterization check fails.
Optionally, before determining that the verification result is the first identifier, the method further includes:
and calculating the sampling maximum error and the minimum total voltage of the battery module according to a preset voltage difference interval calculation mode to obtain a third preset voltage difference interval.
Optionally, in the case that the verification result is a preset verification result, determining the initial number as the actual number of battery modules connected to the CMU includes:
and determining the initial number as the actual number of battery modules connected with the CMU under the condition that the verification result is the first identification.
Optionally, in the case that the verification result is the second identifier, the method further includes:
the output number determines failure information.
A determination apparatus of a number of battery modules, applied to a CMU connected to at least one BMU, comprising:
the first quantity determining module is used for checking the online state of the BMU to obtain the online quantity of the BMU connected with the CMU;
a second number determining module for determining the online number as an initial number of battery modules connected to the CMU;
the voltage verification module is used for verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result;
and the third quantity determining module is used for determining the initial quantity as the actual quantity of the battery modules connected with the CMU under the condition that the check result is a preset check result.
A storage medium including a stored program, wherein the program performs 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 invokes a program for executing the method for determining the number of battery modules described above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for determining battery module data and a related device, wherein in the method, the online state of a BMU is checked to obtain the online quantity of the BMU connected with the CMU, then the online quantity is determined as the initial quantity of battery modules connected with the CMU, the total voltage of the battery modules corresponding to the initial quantity is checked to obtain a checking result, and the initial quantity is determined as the actual battery module quantity of the battery modules connected with the CMU under the condition that the checking result is a preset checking result. The invention firstly determines the initial number of the battery modules, then checks the initial number, and determines the actual number of the battery modules after the initial number passes the check, thereby improving the accuracy of the determined number of the battery modules and further improving the accuracy of the CMU on BMU control.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a 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 for 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 following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a structure diagram of a battery management system BMS, which mainly includes the following structures:
BMU: the PACKBS with the functions of cell voltage and temperature sampling, passive equalization and the like is arranged in the PACK, adopts a software-free design, and realizes communication and control functions through a differential UART daisy chain.
CMU: the power supply device is arranged in the switch box and has the functions of SOC calculation, PACKBS control, main power circuit on-off control and the like. Wherein RACK is a battery cluster.
SMU (system level BMS): the system is arranged in a direct current power distribution cabinet and has the functions of environment monitoring (selecting and matching), RACK BMS control and main power circuit on-off control.
In a BMS system, the BMS system is divided into three-level architecture, wherein the first-level architecture is SMU, the second-level architecture is CMU, and the three-level architecture is BMU, and the three-level architecture forms a communication architecture of the BMS. A CMU is connected with a plurality of battery management units BMU, each BMU is arranged in a battery module PACK, and a plurality of battery modules PACK are connected in series to form a battery cluster RACK. The SMU can communicate with CMUs in the battery cluster, and the CMUs can communicate with BMUs inside the battery module.
More specifically:
a battery module PACK is formed by connecting a plurality of electric cores in parallel or in series, and a BMU in the PACK is responsible for sampling the voltages of all the electric cores in the PACK and sampling the temperature points arranged in the PACK, so that the electric cores in the PACK are balanced under certain conditions.
A plurality of battery modules PACK are connected in series to form a battery cluster RACK, a CMU is arranged in the RACK, and the CMU mainly functions to collect total voltage and total current after the PACKs are connected in series, control the relay (P+ and P-) to be closed and opened, calculate the state of charge SOC and the like.
The voltage and the current after the RACK are connected in parallel are supplied to a PCS (process control system) through a BCP (binary coded decimal) bus cabinet, so that the power distribution conversion of energy storage, a power grid and a photovoltaic system is realized. The BCP is internally provided with SMUs, and the main function is to collect information such as voltage, current, temperature and the like of the multi-CMU and then to gather the information to the PCS controller.
The PCS controller interacts with the energy management unit EMS to realize the control requirement with the terminal customer.
The LC in fig. 1 is a local controller, and is responsible for managing the SMU devices of the lower computer, and receiving the scheduling control of the devices such as the EMS devices of the upper computer;
the PC, i.e., the local computer, is responsible for receiving the EMS data and displaying and storing the sampled data.
And a power control circuit: and the hardware circuit is used for realizing conversion between direct current at the battery end and alternating current at the user end.
The number of battery modules in fig. 1 is configurable according to actual use requirements, such as use environment and energy requirements. If the high-pressure single module of a certain system is 3.2kWh, the product model is actually formed according to the different number of modules as shown in Table 1. The products of different models are different in number of battery modules in software, and the number of the battery modules is set through the software so as to adapt to the products of all models.
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 battery modules may be configured, and the CMU may determine a total voltage threshold, such as a total voltage threshold and a total voltage threshold, according to the total voltage of the battery modules, and then compare the total voltage of the battery modules with the collected total voltage of the battery modules to determine an operation state of the total voltage of the battery modules, and perform corresponding fault protection.
Since the number of battery modules and the number of built-in battery cores of the BMU determine the total voltage range of RACK, in order to determine the total voltage of the battery modules, the CMU needs to determine the number of battery modules, where, since one battery module is configured with one BMU, in this embodiment, the determined number of battery modules is also the number of BMUs.
In order to realize the number of battery modules, the inventor finds that a hardware dial switch can be added, and reads the setting of the dial switch when the CMU is powered on each time, and then identifies the number of battery modules according to the agreed rule.
However, in this method, the number of battery modules is manually determined, and then the number of dial switches is adjusted, and referring to table 1, if the number of battery modules is 3, the number of dial switches is adjusted to 1. If the number of the battery modules is 4, the number of the dial switch is adjusted to be 2.
The mode of setting the dial switch is easy to damage along with the increase of operation times or improper operation due to manual operation. In addition, manual operation accuracy is low. The hardware cost is higher by adding the dial switch, and in addition, the waterproof function of the dial switch is required to be configured, so that the implementation is more complex.
In order to solve the problems caused by the manual operation of the dial switch, the inventor finds that the number of battery modules can be set when leaving the factory, and then corresponding software versions are 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.
Therefore, the inventor finds that the online quantity of the BMU in the battery module can be determined in the use process of the battery module, and then the online quantity is checked to obtain the final quantity of the battery module. Therefore, the number of the battery modules can be determined in an automatic mode, no manual work is needed, and the problem of low accuracy caused by manual misoperation is avoided. In addition, hardware such as a dial switch and the like is not required to be arranged, so that the 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 state of the BMU is checked to obtain the online number of the BMU connected to the CMU, then the online number is determined as the initial number of battery modules connected to the CMU, and the total voltage of the battery modules corresponding to the initial number is checked to obtain a check result, and if the check result is a preset check result, the initial number is determined as the actual number of battery modules of the battery modules connected to the CMU. The invention firstly determines the initial number of the battery modules, then checks the initial number, and determines the actual number of the battery modules after the initial number passes the check, thereby improving the accuracy of the determined number of the battery modules and further improving the accuracy of the CMU on BMU control.
The whole working process is that firstly the CMU identifies the quantity of BMU through daisy chain communication, then compares the sum of the collected RACK total voltage and the identified PACK voltage, confirms the quantity of modules after verification, then closes a relay of RACK, at this time, the total voltage of RACK is connected to the input end of PCS, and then a controller of PCS collects the voltage of PCS end. The CMU obtains the voltage of the PCS end through communication with the PCS controller, then compares the voltage with the total voltage of the RACK end acquired by the CMU, and confirms the number of modules again after verification, so that the system works normally. The PCS control can charge and discharge RACK at this time.
Based on the foregoing, 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, where the CMU is connected to at least one BMU, and in this embodiment, it is necessary to determine the number of BMUs connected to the CMU, that is, the number of battery modules.
Referring to fig. 2, the method of determining the number of battery modules may include:
s11, checking the online state of the BMU to obtain the online quantity of the BMU connected with the CMU.
In practical applications, the BMS system is provided with a position where a plurality of battery modules can be mounted, and at each position, the battery modules can be selectively placed or not placed. For example, assume that 10 battery modules are provided in total, but in practical application, only 6 battery modules are required, so that there are 4 positions in which the battery modules are not placed. In this embodiment, the battery modules PACK in the battery cluster RACK are serially connected in sequence.
In this embodiment, it is necessary to determine how many battery modules are in the battery cluster. In the actual use process, if the BMU exists, the BMU can communicate with the CMU, the CMU can check whether the BMU is online or not based on data stored in a configuration register in the BMU, and if the BMU is online, the BMU can acquire the data stored in the configuration register and check the BMU is passed, the BMU is indicated to be online. Therefore, in the present embodiment, the number of BMUs on line can be obtained from the number of verification passes.
Specifically, referring to fig. 3, step S11 may include:
s21, basic data and check data stored in the BMU are obtained, wherein the check data are obtained by calculating the basic data in a preset check mode.
In practice, the CMU first empties the read data cache and then initializes the number of online BMUs to 0. And then, reading configuration registers of the BMU chips with the maximum BMU quantity to obtain basic data and check data stored in the configuration registers, wherein the check data is obtained by calculating the basic data through a preset check mode (such as a CRC check mode).
The communication manner between the CMU and the BMU may refer to fig. 4. And the base data and the check data stored in the BMU are acquired by adopting a daisy chain communication mode between the CMU and the BMU.
S22, calculating the basic data in the preset verification mode to obtain a verification value.
Specifically, the above CRC check method may be used to calculate the base data to obtain the check value.
S23, comparing the check value with the check data to obtain a judging result of whether the BMU is on line or not.
Since the check value and the check data are obtained by calculating the same basic data in a CRC check mode, the check value and the check data should be the same in theory.
In this embodiment, if the check value is the same as the check data, it is determined that the BMU is online, and if the check value is different from the check data, it is determined that the BMU is not online.
S24, determining the online quantity of the BMU connected with the CMU, which corresponds to the judging result.
In practical application, the judgment result is determined to be the number of preset judgment results (online), and the online number of the BMUs connected with the CMU is determined.
When judging whether the BMU is online, the CMU sequentially judges each BMU. In this embodiment, the number of BMUs passing through the determination result is determined, and the number is the online number of BMUs.
In this embodiment, the set level 1 is the verification level, 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 calculated verification value are used to perform no-match, so as to realize confirmation of the number of BMU chips in the module.
And S12, determining the online quantity as the initial quantity of the battery modules connected with the CMU.
According to the above discussion, one BMU is provided in each battery module, so the on-line number of BMUs is the initial number of battery modules connected to the CMU.
And S13, checking the total voltage of the battery modules corresponding to the initial number to obtain a checking result.
In practical application, the total voltage of the battery modules can be obtained in various modes, specifically, the total voltage of the battery modules corresponding to the initial number obtained in a plurality of preset obtaining modes is obtained, 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 acquired through a plurality of preset acquisition modes may include:
1) And acquiring the acquired total voltage of the first battery modules corresponding to the initial number in a voltage acquisition mode.
Referring to fig. 4, the cmu may collect the total voltage of all online battery modules by sampling the total voltage of the battery terminals, which is referred to as the first battery module total voltage in this embodiment. I.e., the first battery module total voltage Vb corresponding to the initial number is collected.
2) And acquiring the total voltage of the second battery modules, which corresponds to the initial number and is acquired by the PCS system connected with the CMU.
Referring to fig. 4, the cmu may communicate with the PCS system, in practical application, the voltage of the PCS terminal is equal to the RACK voltage when some battery clusters RACK in the battery management system BMS are not connected in parallel, but only RACK with smaller voltage difference is connected in parallel when some battery clusters RACK in the battery management system BMS are connected in parallel, so that the voltage of the PCS terminal after being connected in parallel is not greatly different from any RACK voltage, and then the voltage after being connected in parallel can be used as the total voltage of RACK. And acquiring a PCS end total voltage sampling value, namely the second battery module total voltage Vp corresponding to the initial quantity.
3) And obtaining 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 on-line BMUs to obtain the cell voltages of the battery modules where the BMUs are 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 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, that indicates that the verification passes. If the verification is passed, it indicates that the determined initial number is correct, and the initial number is determined as the actual number of battery modules connected with the CMU, thereby obtaining the actual number of battery modules in the BMS system.
In this embodiment, the online state of the BMU is checked to obtain an online number of BMUs connected to the CMU, then the online number is determined as an initial number of battery modules connected to the CMU, and a total voltage of the battery modules corresponding to the initial number is checked to obtain a check result, where the initial number is determined as an actual number of battery modules connected to the CMU when the check result is a preset check result. The invention firstly determines the initial number of the battery modules, then checks the initial number, and determines the actual number of the battery modules after the initial number passes the check, thereby improving the accuracy of the determined number of the battery modules and further improving the accuracy of the CMU on BMU control.
In addition, the invention adopts software automatic identification, does not need to add dial switch and waterproof and dustproof measures, and can reduce hardware cost. The automatic identification is realized by powering on without manual dialing and setting by software, and the operation is simple.
The above embodiments refer to "checking the total voltage of the battery module to obtain a checking result", and the specific implementation process of the battery module is described, so that two implementation modes are altogether provided.
1. The first implementation mode:
referring to fig. 5, the verification of the total voltage of the battery module to obtain a verification result includes:
and S31, selecting two battery module total voltages from the first battery module total voltage, the second battery module total voltage and the third battery module total 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 be performed according to a preset selection rule, for example, selecting two voltages with larger values or selecting two voltages with smaller values.
S32, calculating a first difference value of the total voltages of the two selected battery modules.
S33, checking whether the first difference value is in a first preset voltage difference value interval or not to obtain a checking result.
In practical application, if the first difference value of the total voltages of the two battery modules is within a first preset voltage difference value interval, the determined initial quantity is verified, and the verification result is determined to be a first identifier; the first identifier characterizes the verification passing.
If the first difference value of the total voltages of the two battery modules is not in the first preset voltage difference value interval, the determined initial quantity is verified to pass, and the verification result is determined to be a second mark; the first identity characterization check fails.
2. The second implementation mode:
referring to fig. 6, the verification of the total voltage of the battery module to obtain a verification result includes:
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 to the online number of the BMU, and the number of returns (three times in this example) must be consistent and within a reasonable range, otherwise, the judgment is finished, and the failure is returned. If the number of returns is consistent and within a reasonable range, step S41 is performed, i.e. calculating the difference between the total voltage Vs of the third battery module and the total voltage Vb of the first battery module.
S42, calculating a third difference value 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 in a second preset voltage difference value interval.
The second preset voltage difference interval and the first preset voltage difference interval are set by a technician according to specific use situations.
And when the second difference value is within a second preset voltage difference value interval, the initial quantity verification is passed, and at the moment, a third difference value between the total voltage Vb of the first battery module and the total voltage Vp of the second battery module is calculated.
S43, judging whether the third difference value is in a third preset voltage difference value interval or not; if yes, go to step S44; if not, go to step S45.
In practical applications, it is necessary to determine the third preset voltage difference interval before determining whether the third difference is within the third preset voltage difference interval.
Specifically, according to a preset voltage difference interval calculation mode, calculating a sampling maximum error and a minimum total voltage of the battery module to obtain a third preset voltage difference interval.
In detail, the minimum value of the third preset voltage difference interval cannot be lower than the sampling maximum error, and the maximum value cannot be greater than the minimum total voltage of one battery module.
Single cell sampling maximum error = single cell sampling maximum error;
examples: the total pressure sampling precision of the system is +/-3V (0-600V), and the maximum sampling error is 6V.
The system adopts the 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 < =160×3=480 mV;
battery module minimum total voltage = cell minimum voltage cell number of battery module cells;
examples: under normal conditions, the application range of the single cell voltage is 2.0V-3.65V, and the system designs 20 single cell cores of one battery module, namely the minimum total voltage of the battery module is > =2.0x20=40V;
from the above analysis, the differential pressure threshold is set to be more than 6V and less than 40V. The actual situation is that the minimum total voltage of the battery module is half, namely 20V is reasonable.
S44, determining the verification result as a first identifier; the first identifier characterizes the verification passing.
And if the third difference value is in a third preset voltage difference value interval, the verification is passed, and the verification result is the first mark.
S45, determining the verification result as a second identifier, wherein the second identifier represents that verification fails.
If the third difference value is not in the third preset voltage difference value interval, the verification is not passed, and the verification result is the second mark.
It should be noted that, the above-mentioned "calculating the third difference value between the total voltage of the first battery module and the total voltage of the second battery module" determines the verification result as the first identifier when the third difference value is within a third preset voltage difference value interval; the first mark represents verification, and the verification result is determined to be a second mark when the third difference value is not in a third preset voltage difference value interval; the specific implementation manner of the second identifier representation verification that the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module is not passed is that the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module is verified to obtain a verification result, and other specific processes for realizing that the voltage difference between the total voltage of the first battery module and the total voltage of the second battery module is verified to obtain the verification result are also within the protection scope of the invention.
In addition, a check 2 stage and a check 3 stage are provided in the present embodiment, wherein:
check 2: the CMU acquires the verification of the total voltage of the battery end and the sum of the monomer voltages fed back by the daisy chain communication through AD sampling.
Check 3: the CMU is communicated with the PCS through the CAN to obtain the total voltage sampled by the PCS and the total voltage sampled by the battery end, and the verification of the number of the ad hoc network modules is realized.
In this embodiment, the first stage of verification is performed, the second stage of verification is performed, the third stage of verification is performed, and if the third stage of verification passes, it is indicated that the above-determined initial number is correct, and it may be used as the number of battery modules connected to the CMU.
Specifically, in the case that the verification result is a preset verification result, determining the initial number as the actual number of battery modules connected to the CMU includes:
and determining the initial number as the actual number of battery modules connected with the CMU under the condition that the verification result is the first identification.
And under the condition that the verification result is the second identifier, the initial number is not the actual number of the battery modules connected with the CMU, and the number determination failure information is output at the moment, for example, the number determination failure information can be output to the user terminal, so that the user can know the situation of determining the number of the battery modules in time.
And when the third difference value is not in the third preset voltage difference value interval, the verification result is the second identifier, and when the second difference value is not in the second preset voltage difference value interval, or the CMU calls the daisy-chain communication function module for multiple times to return to the BMU, the number of the on-line BMU is the same, but the number of the battery modules is not in a reasonable range, the determination of the number of the battery modules is considered to be failed.
In this embodiment, the initial number of values is checked by using a system networking technology (daisy chain) and a three-level software checking algorithm, and after the initial number of values passes the checking, the final number of battery modules is automatically determined, so that the risk of wrong module identification on the system operation is reduced, and the reliability of the system is improved.
In addition to the above determination of the number of battery modules, the embodiment of the present invention may further determine what cause cannot normally determine the number of battery modules when the number of battery modules cannot be determined normally.
Specifically, cases of false recognition or unsuccessful recognition which may occur in the automatic recognition process for the number of BMUs are listed below, and a corresponding processing method is adopted for each case.
1. Daisy chain communication fails;
for the daisy chain communication failure, under the condition that the total voltage 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 to the BMU in different online quantity, or the CMU calls the daisy chain communication function module for multiple times to return to the BMU in the same online quantity, but the online quantity is 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 the total voltage 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 failure and total voltage sampling error;
for the situation that the daisy chain communication failure and the total voltage sampling error coexist, the 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 to the BMU in different online quantity, or the CMU calls the daisy chain communication function module for multiple times to return to the BMU in the same online quantity, but not in a reasonable range, or the second difference value is not in a second preset voltage difference value interval, or the third difference value is not in a third preset voltage difference value interval.
Optionally, on the basis of the 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, where the CMU is connected to at least one BMU, and the determining device includes:
the first number determining module 11 is configured to verify the online status of the BMU to obtain an online number 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 verification module 13 is used for verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result;
and a third number determining module 14, configured to determine the initial number as an actual number of battery modules connected to the CMU when the verification result is a preset verification result.
Further, the first number determination module 11 includes:
the data acquisition sub-module is used for acquiring basic data and check data stored in the BMU, wherein the check data is obtained by calculating the basic data in a preset check mode;
the data calculation sub-module is used for calculating the basic data in the preset verification mode to obtain a verification value;
the data comparison sub-module is used for comparing the check value with the check data to obtain a judging result of whether the BMU is on line or not;
and the quantity determination submodule is used for determining the online quantity of the BMU connected with the CMU, which corresponds to the judging result.
Further, the data acquisition sub-module is specifically configured to:
And acquiring the basic data and the verification data stored in the BMU through 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 BMUs connected with the CMU.
Further, the voltage verification module 13 includes:
the voltage acquisition sub-module is used for acquiring the total voltage of the battery modules corresponding to the initial number acquired through a plurality of preset acquisition modes;
and the verification sub-module is used for verifying the total voltage of the battery module to obtain a verification result.
Further, the voltage acquisition sub-module is specifically configured to:
acquiring the total voltage of the first battery modules corresponding to the initial quantity acquired in a voltage acquisition mode;
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;
and obtaining 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 verification sub-module is specifically configured to:
selecting two battery module total voltages from the first battery module total voltage, the second battery module total voltage, and the third battery module total voltage;
Calculating a first difference value of the total voltages of the two selected battery modules;
and checking whether the first difference value is in a first preset voltage difference value interval or not to obtain a checking result.
Further, the verification sub-module includes:
a difference calculation sub-module for calculating a second difference between the third battery module total voltage and the first battery module total voltage;
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 in 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 first battery module total voltage and the second battery module total voltage;
determining that the verification result is a first identifier under the condition that the third difference value is in a third preset voltage difference value interval; the first identifier represents that the verification passes;
determining that the verification result is a second identifier when the third difference value is not in a third preset voltage difference value interval; the second identity characterization check fails.
Further, the method further comprises the following steps:
the difference value interval determining unit is used for calculating the sampling maximum error and the minimum total voltage of the battery module according to a preset voltage difference value interval calculating mode to obtain a third preset voltage difference value interval.
Further, the third number determination module 14 is specifically configured to:
and determining the initial number as the actual number of battery modules connected with the CMU under the condition that the verification result is the first identification.
Further, the method further comprises the following steps:
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 state of the BMU is checked to obtain an online number of BMUs connected to the CMU, then the online number is determined as an initial number of battery modules connected to the CMU, and a total voltage of the battery modules corresponding to the initial number is checked to obtain a check result, where the initial number is determined as an actual number of battery modules connected to the CMU when the check result is a preset check result. The invention firstly determines the initial number of the battery modules, then checks the initial number, and determines the actual number of the battery modules after the initial number passes the check, thereby improving the accuracy of the determined number of the battery modules and further improving the accuracy of the CMU on BMU control.
It should be noted that, in the working process of each module, sub-module and unit in this embodiment, please refer to the corresponding description in the above embodiment, and the description is omitted here.
Optionally, on the basis of the above embodiment of the method and apparatus 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 above method for determining the number of battery modules.
Optionally, on the basis of the embodiment of the method and the device 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 invokes a program for executing the method for determining the number of battery modules described above.
In this embodiment, the online state of the BMU is checked to obtain an online number of BMUs connected to the CMU, then the online number is determined as an initial number of battery modules connected to the CMU, and a total voltage of the battery modules corresponding to the initial number is checked to obtain a check result, where the initial number is determined as an actual number of battery modules connected to the CMU when the check result is a preset check result. The invention firstly determines the initial number of the battery modules, then checks the initial number, and determines the actual number of the battery modules after the initial number passes the check, thereby improving the accuracy of the determined number of the battery modules and further improving the accuracy of the CMU on BMU control.
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 (12)

1. A method for determining the number of battery modules, applied to a battery cluster level battery management system CMU, the CMU being connected to at least one battery management unit BMU, the method comprising:
checking the online state of the BMU to obtain the online quantity of the BMU connected with the CMU;
determining the on-line number as an initial number of battery modules connected to the CMU;
the total voltage of the battery modules corresponding to the initial number is checked to obtain a checking result;
determining the initial number as the actual number of battery modules connected with the CMU under the condition that the verification result is a preset verification result;
The method for verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result comprises the following steps:
acquiring the total voltage of the first battery modules corresponding to the initial quantity acquired in a voltage acquisition mode;
acquiring a total voltage of a second battery module, which is acquired by a PCS (process control system) connected with the CMU and corresponds to the initial number;
obtaining 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;
the method for verifying the total voltage of the battery module comprises the following steps of:
selecting two battery module total voltages from the first battery module total voltage, the second battery module total voltage, and the third battery module total voltage; calculating a first difference value of the total voltages of the two selected battery modules; checking whether the first difference value is in a first preset voltage difference value interval or not to obtain a checking result;
or alternatively, the first and second heat exchangers may be,
calculating a second difference between the third battery module total voltage and the first battery module total voltage; and under the condition that the second difference value is in 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.
2. The method for determining the presence status of the BMU according to claim 1, wherein verifying the presence status of the BMU to obtain the presence number of the BMU connected to the CMU comprises:
basic data and check data stored in the BMU are obtained, wherein the check data are obtained by calculating the basic data in a preset check mode;
calculating the basic data in the preset verification mode to obtain a verification value;
comparing the check value with the check data to obtain a judging result of whether the BMU is on line or not;
and determining the online quantity of the BMU connected with the CMU, which corresponds to the judging result.
3. The method of determining 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 through a daisy chain communication mode.
4. The determination 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 BMUs connected with the CMU.
5. The method according to claim 1, wherein verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result includes:
acquiring the total voltage of the battery modules corresponding to the initial number acquired through a plurality of preset acquisition modes;
and verifying the total voltage of the battery module to obtain a verification result.
6. The method of determining according to claim 1, wherein verifying the voltage difference between the first battery module total voltage and the second battery module total voltage to obtain a verification result includes:
calculating a third difference between the first battery module total voltage and the second battery module total voltage;
determining that the verification result is a first identifier under the condition that the third difference value is in a third preset voltage difference value interval; the first identifier represents that the verification passes;
determining that the verification result is a second identifier when the third difference value is not in a third preset voltage difference value interval; the second identity characterization check fails.
7. The method according to claim 6, wherein, in the case where the third difference is within a third preset voltage difference interval, before determining that the verification result is the first flag, further comprising:
And calculating the sampling maximum error and the minimum total voltage of the battery module according to a preset voltage difference interval calculation mode to obtain a third preset voltage difference interval.
8. The determination method according to claim 6, wherein in the case where the check result is a preset check result, determining the initial number as the actual number of battery modules of the battery modules connected to the CMU includes:
and determining the initial number as the actual number of battery modules connected with the CMU under the condition that the verification result is the first identification.
9. The method according to claim 6, wherein in the case where the check result is the second flag, further comprising:
the output number determines failure information.
10. A determination apparatus for the number of battery modules, applied to a battery cluster-level battery management system CMU connected to at least one battery management unit BMU, comprising:
the first quantity determining module is used for checking the online state of the BMU to obtain the online quantity of the BMU connected with the CMU;
a second number determining module for determining the online number as an initial number of battery modules connected to the CMU;
The voltage verification module is used for verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result;
a third number determining module, configured to determine, when the check result is a preset check result, the initial number as an actual number of battery modules of the battery modules connected to the CMU;
the method for verifying the total voltage of the battery modules corresponding to the initial number to obtain a verification result comprises the following steps:
acquiring the total voltage of the first battery modules corresponding to the initial quantity acquired in a voltage acquisition mode;
acquiring a total voltage of a second battery module, which is acquired by a PCS (process control system) connected with the CMU and corresponds to the initial number;
obtaining 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;
the method for verifying the total voltage of the battery module comprises the following steps of:
selecting two battery module total voltages from the first battery module total voltage, the second battery module total voltage, and the third battery module total voltage; calculating a first difference value of the total voltages of the two selected battery modules; checking whether the first difference value is in a first preset voltage difference value interval or not to obtain a checking result;
Or alternatively, the first and second heat exchangers may be,
calculating a second difference between the third battery module total voltage and the first battery module total voltage; and under the condition that the second difference value is in 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.
11. A storage medium comprising a stored program, wherein the program performs the method of determining the number of battery modules according to any one of claims 1 to 9.
12. A battery cluster-level battery management system, comprising: a memory and a processor;
wherein the memory is used for storing programs;
the processor invokes a program and is configured to execute the method of determining the number of battery modules as claimed in any one of claims 1 to 9.
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