CN111564857A - Parallel battery pack control system, method and device - Google Patents
Parallel battery pack control system, method and device Download PDFInfo
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- CN111564857A CN111564857A CN201910115179.8A CN201910115179A CN111564857A CN 111564857 A CN111564857 A CN 111564857A CN 201910115179 A CN201910115179 A CN 201910115179A CN 111564857 A CN111564857 A CN 111564857A
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- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
A parallel battery pack control method comprises the following steps: when the parallel battery pack is started, acquiring identification code information of the battery pack and a time interval for sending an identification code instruction; controlling the battery pack to send the identification code instruction to other battery packs according to the time interval; and determining one battery pack as a pre-master and the rest battery packs as pre-slaves according to the identification code information of each battery pack. The invention also provides a parallel battery pack control system and a parallel battery pack control device. The parallel battery pack control system, the parallel battery pack control method and the parallel battery pack control device can avoid parallel operation failure caused by artificial hardware misoperation, reduce the error rate of parallel operation and save production and maintenance cost.
Description
Technical Field
The present application relates to the field of power supply technologies, and in particular, to a parallel battery pack control system, method, and apparatus.
Background
Along with the popularization of intellectualization and informatization, the power consumption demand of users is increased rapidly, and the application of the household energy storage system is developed unprecedentedly. In the electricity consumption valley time, can charge the group battery among the energy storage system of family to balanced power consumption load when stand-by power consumption peak saves the household power consumption spending. In addition, the battery pack of the household energy storage system is also used as an emergency power supply after being charged during power failure. In order to meet the increasing demand of users on the power and the endurance time of the energy storage battery, if a single battery pack scheme is still adopted, the energy density and the cell capacity of a battery cell of the battery pack must be increased, so that the volume and the weight of the battery pack are increased, and the research, development, manufacturing, transportation and installation costs of the battery pack are increased. And the parallel connection scheme of the battery pack is adopted, and from the research and development perspective, only one set of low-capacity scheme needs to be designed, so that the research and development cost of developers and the safety certification cost are reduced. The key of the parallel connection of the battery packs is that the master battery pack needs to monitor the state information of each slave battery pack in real time, when the battery pack fails, the master battery pack feeds the failure information back to an energy storage inverter (PCS) in time, and the PCS can immediately reduce power or cut off load operation to ensure the safe operation of the battery packs after the parallel connection.
At present, the battery pack parallel connection strategy on the market is a strategy of identifying a host and a slave to perform parallel connection mainly through hardware schemes such as dial switches and the like. The method needs to additionally increase a hardware design scheme for distinguishing the master machine from the slave machine, increases the production and maintenance cost to a certain extent, increases the parallel operation failure caused by artificial hardware misoperation, and increases the error rate of the parallel operation.
Disclosure of Invention
In view of the above, there is a need for a parallel battery control system, method and device, which can avoid parallel operation failure caused by human hardware misoperation, reduce error rate of parallel operation, and save production and maintenance costs.
An embodiment of the present application provides a parallel battery pack control method, where the parallel battery pack includes a plurality of battery packs connected in parallel, the parallel battery pack control method including the steps of: when the parallel battery pack is started, acquiring identification code information of the battery pack and a time interval for sending an identification code instruction; controlling the battery pack to send the identification code instruction to other battery packs according to the time interval; and determining one battery pack as a pre-master and the rest battery packs as pre-slaves according to the identification code information of each battery pack.
According to some embodiments of the present application, the step of obtaining the identification code information of a battery pack and the time interval for sending the identification code instruction comprises: selecting a random value from a battery management system, and generating a first random number and a second random number according to the random value; and setting the first random number as identification code information of the battery pack, and setting the second random number as a time interval at which the battery pack repeatedly sends identification code instructions.
According to some embodiments of the present application, the step of selecting a random value from the battery management system and generating the first random number and the second random number according to the random value comprises: selecting a random value from a battery management system according to a sampling value of an analog-to-digital converter of the battery pack; and
and generating the first random number and the second random number according to the random value.
According to some embodiments of the present application, the step of generating the first random number and the second random number according to the random value comprises: and inputting the random value serving as a random factor into a preset random function to generate the first random number and the second random number.
According to some embodiments of the present application, the step of controlling the battery pack to send the identification code instruction to other battery packs according to the time interval further comprises: when the battery pack receives the identification code instructions of other battery packs, the battery pack informs the self identification code information of the battery pack to the other battery packs and stops broadcasting the self identification code information outwards.
According to some embodiments of the present application, the step of determining one battery pack as a pre-master and the rest battery packs as pre-slaves according to the identification code information of each battery pack further includes: the pre-master machine reads the state information of each pre-slave machine; judging whether the parallel battery pack meets the condition of starting output or not according to the state information of the pre-master machine and the state information of each pre-slave machine; and controlling the output state of the parallel battery pack based on the judgment result.
According to some embodiments of the present application, the step of determining whether the parallel battery pack satisfies a condition for turning on an output according to the state information of the pre-master and the state information of each pre-slave includes: judging whether the voltage difference between any two battery packs in the parallel battery packs is smaller than a preset value according to the state information of each battery pack; judging whether a faulty battery pack exists in the parallel battery packs according to the state information of each battery pack; and
and when the voltage difference between any two battery packs in the parallel battery packs is smaller than the preset value and no faulty battery pack exists in the parallel battery packs, judging that the parallel battery packs meet the condition of starting output.
According to some embodiments of the present application, the controlling the output state of the parallel battery packs based on the determination result includes: when the parallel battery pack meets the condition of starting output, controlling the pre-host to start output; and after the pre-master successfully starts the output, sending a starting-up instruction to each pre-slave machine so as to control each pre-slave machine to start the output.
According to some embodiments of the present application, the parallel battery pack control method further comprises: judging whether the pre-host receives a host identification signal sent by the inverter within a preset time; when the pre-host receives a host identification signal sent by the inverter within the preset time, setting the pre-host as a host of the parallel battery pack; when the pre-master does not receive the master identification signal sent by the inverter within the preset time, setting the pre-master as a slave of the parallel battery pack; judging whether a plurality of pre-slave machines receive a host identification signal sent by the inverter within the preset time; when a pre-slave machine receives a host identification signal sent by the inverter within the preset time, setting the pre-slave machine as a host of the parallel battery pack; and when a pre-slave machine does not receive the host identification signal sent by the inverter within the preset time, setting the pre-slave machine as a slave machine of the parallel battery pack.
According to some embodiments of the present application, the parallel battery pack control method further comprises: controlling the host to acquire the state information of each slave; judging whether a faulty battery pack exists in the parallel battery packs or not according to the state information of the host and the state information of each slave; when the master machine is a fault battery pack, the output of each slave machine is closed; and when the plurality of slave machines have the fault battery packs, the output of the master machine and the rest of the slave machines which normally operate is closed.
According to some embodiments of the present application, the parallel battery pack control method further comprises: when the parallel battery pack completes the setting of a master machine and a slave machine, setting the sum of the currents of the master machine and each slave machine as the current of the parallel battery pack, setting the lowest charge state parameter of the master machine and a plurality of slave machines as the charge state parameter of the parallel battery pack, setting the highest temperature of the master machine and a plurality of slave machines as the highest temperature of the parallel battery pack, setting the lowest temperature of the master machine and a plurality of slave machines as the lowest temperature of the parallel battery pack, setting the maximum battery voltage of the master machine and a plurality of slave machines as the maximum battery voltage of the parallel battery pack, and setting the minimum battery voltage of the master machine and a plurality of slave machines as the minimum battery voltage of the parallel battery pack; setting the maximum voltage of the master machine and the plurality of slave machines as the voltage of the parallel battery pack when the parallel battery pack is in a charging state; and when the parallel battery pack is in a discharging state, setting the minimum voltage of the master machine and the plurality of slave machines as the voltage of the parallel battery pack.
According to some embodiments of the application, the step of controlling the battery pack to send the identification code instruction to other battery packs according to the time interval comprises: controlling the battery pack to send the identification code instruction to other battery packs, and timing the sending time and counting the sending times; judging whether the battery pack receives identification code information of other battery packs, if not, judging whether the sending time is greater than the time interval and whether the sending times is less than preset times; when the sending time is greater than the time interval and the sending times are less than the preset times, controlling the battery pack to send the identification code instruction to other battery packs again, re-timing the sending time, and adding one to the sending times; and outputting parallel operation abnormity warning information when the battery pack does not receive the identification code information of other battery packs and the sending times is not less than the preset times.
According to some embodiments of the present application, the step of determining that one battery pack is a pre-master and the remaining battery packs are pre-slaves according to the identification code information of each battery pack includes: comparing the size of the identification code information of each battery pack, determining the battery pack with the minimum identification code information as a pre-master machine, and determining the rest battery packs as pre-slave machines; or comparing the size of the identification code information of each battery pack, determining the battery pack with the maximum identification code information as a pre-master machine, and determining the rest battery packs as pre-slave machines.
One embodiment of the present application provides a parallel battery pack control system, which includes computer program instructions, which are loaded and executed by a parallel battery pack control device to control the parallel battery pack control device to execute the parallel battery pack control method.
An embodiment of the present application provides a parallel battery pack control apparatus, including: a memory for storing computer program instructions; and the processor is used for loading the computer program instructions to execute the parallel battery pack control method.
Compared with the prior art, the parallel battery pack control system, the method and the device have the advantages that when the parallel battery pack is started, each battery pack randomly generates identification code information and compares the identification code information of different battery packs, each battery pack is divided into the pre-master or the pre-slave, meanwhile, the pre-master controls other pre-slaves to be started and output to activate the energy storage inverter, and then the final physical master and the final physical slave are determined according to the master identification information sent by the energy storage inverter, so that the automatic parallel operation success of the battery packs is realized, the parallel operation is realized without adding extra hardware, the parallel operation failure caused by hardware operation errors can be avoided, the error rate of the parallel operation is reduced, and meanwhile, the production and maintenance cost can be saved.
Drawings
Fig. 1 is a schematic diagram of a parallel system architecture of parallel battery packs according to an embodiment of the present application;
fig. 2 is a flow chart of steps of a parallel battery pack control method according to an embodiment of the present application;
fig. 3 is a schematic diagram of a parallel battery pack control apparatus according to an embodiment of the present application;
fig. 4 is a functional block diagram of a parallel battery pack control system according to an embodiment of the present application.
Description of the main elements
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10 |
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10a、10b、10c |
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20 |
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30 |
| Parallel battery |
100 |
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| Processor with a memory having a plurality of |
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| Determining |
1033 |
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. 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 application.
It is further noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Referring to fig. 1, fig. 1 is a schematic diagram of a system architecture for parallel operation of parallel battery packs 10 according to an embodiment of the present disclosure.
The parallel battery pack 10 includes a plurality of battery packs connected in parallel (fig. 1 illustrates only three battery packs 10a, 10b, and 10c, and may be more or less than three). Each battery pack 10a, 10B or 10c comprises an anode B + and a cathode B-, the anodes B + of each battery pack 10a-10c are connected together to form the anode of the parallel battery pack 10, and the cathodes B-of each battery pack 10a-10c are connected together to form the cathode of the parallel battery pack 10. The output of the parallel battery pack 10 is converged to the dc input side of the energy storage inverter 20. Each battery pack 10a-10c is also communicatively coupled to the battery management system 30 such that the battery management system 30 may manage each battery pack 10a-10 c.
In one embodiment, each of the battery packs 10a-10c further includes an internal bus interface and an external bus interface, the internal bus interface can implement an internal bus communication function, and the external bus interface can implement an external bus communication function. An internal bus communication function may be used to enable internal communication between each battery pack 10a-10c and an external bus communication function may be used to enable communication between the host and the energy storage inverter 20.
Referring to fig. 2, fig. 2 is a flowchart illustrating steps of a parallel battery pack control method according to an implementation manner of the present application. The order of the steps in the flow chart may be changed and some steps may be omitted according to different needs. The parallel battery pack control method may include the following steps.
In step S21, when the parallel battery pack 10 is turned on, the identification code information of the battery pack 10a and the time interval for sending the identification code command are obtained.
In one embodiment, when the parallel battery pack 10 is powered on, the identification code information of the battery pack 10a and the time interval for sending the identification code command are taken as examples for illustration. It is understood that, when the parallel battery pack 10 is turned on, the identification code information of the battery pack 10b and the time interval for sending the identification code command may be acquired, and the identification code information of the battery pack 10c and the time interval for sending the identification code command may be acquired.
In one embodiment, the identification code information may be ID information of the battery pack 10a, and the time interval is an interval time at which the battery pack 10a repeatedly transmits the identification code command, and the identification code command is preferably a command frame for broadcasting the own ID information. The time interval is preferably 100-.
In one embodiment, the time interval for acquiring the identification code information of the battery pack 10a and sending the identification code instruction may be implemented as follows: a random value is selected from the battery management system 30, and a first random number and a second random number are generated based on the random value, the first random number is set as the identification code information of the battery pack 10a, and the second random number is set as the time interval at which the battery pack 10a repeatedly transmits the identification code instruction. It is understood that the time interval for acquiring the identification code information of the battery packs 10b, 10c and sending the identification code instruction may also be implemented in the above manner.
In an embodiment, the generating the first random number and the second random number according to the random value may be specifically implemented by: a random value is selected from the battery management system 30 according to a sampling value (preferably, integer data of the sampling value, for example, if the sampling value is 2.35, the integer data of the sampling value is 2) of the analog-to-digital converter of the battery pack 10a, and the random value is input as a random factor to a preset random function to generate the first random number and the second random number. The preset random function is preferably a rand () function, the analog-to-digital converter may sample the temperature, the current, the voltage, etc. of the battery pack 10a to obtain a corresponding sampling value, and then a random value is selected from the battery management system 30 according to the integer data of the sampling value (such as the sampling value of the temperature, the current, the voltage, etc.) of the analog-to-digital converter of the battery pack 10 a.
For example, the first random number and the second random number may be generated by directly using integer data of a sampling value of the analog-to-digital converter as a random value and inputting the random value as a random factor to a rand () function; it is also possible to select a random value from a predetermined range of values (for example, the predetermined range of values may be 0-65535) in the battery management system 30 according to the integer data of the sampling values of the analog-to-digital converter, and input the random value as a random factor to the rand () function to generate the first random number and the second random number.
Step S22, controlling the battery pack 10a to send the identification code command to other battery packs (e.g. 10b, 10c) according to the time interval.
In one embodiment, the battery pack 10a may be controlled to repeatedly transmit the identification code command to the other battery packs 10b and 10c according to the time interval, and the number of times of repeated transmission is preferably not more than 3 times. When any battery pack 10a receives the identification code instruction sent by the other battery packs 10b and 10c, the self-identification code information of the battery pack 10a is notified to the other battery packs 10b and 10c, and the self-identification code information stops being broadcasted outwards.
It is understood that, for the battery pack 10b, the battery pack 10b may also be controlled to send the identification code command to the other battery packs 10a and 10c according to the corresponding time interval of the battery pack 10 b; for the battery pack 10c, the battery pack 10c may also be controlled to send the identification code command to the other battery packs 10a and 10b according to the time interval corresponding to the battery pack 10 c.
In one embodiment, controlling the battery pack 10a to send the identification code instruction to the other battery packs 10b, 10c according to the time interval may be achieved by: controlling the battery pack 10a to send the identification code instruction to other battery packs 10b and 10c, and timing the sending time and counting the sending times; judging whether the battery pack 10a receives the identification code information of the rest of the battery packs 10b and 10c, and if the battery pack 10a does not receive the identification code information of the rest of the battery packs 10b and 10c, further judging whether the sending time is greater than the time interval and whether the sending times is less than the preset times; when the sending time is greater than the time interval and the sending times are less than the preset times, controlling the battery pack 10a to send the identification code instruction to other battery packs 10b and 10c again, re-timing the sending time, and adding one to the sending times; when the battery pack 10a does not receive the identification code information of the other battery packs 10b and 10c and the sending times are not less than the preset times, the parallel operation is abnormal, and parallel operation abnormal warning information can be output. The preset times can be set according to actual use requirements, for example, the preset times is set to 3 times, and other times can also be set.
Step S23, determining one of the battery packs as a pre-master and the rest as pre-slaves according to the identification code information of each of the battery packs (e.g., 10a-10 c).
In an embodiment, specifically, determining one battery pack as a pre-master and the rest battery packs as pre-slaves from among the plurality of battery packs 10a to 10c may be implemented by: comparing the size of the identification code information of each of the battery packs 10a-10c, determining the battery pack having the smallest identification code information as a pre-master, and determining the remaining battery packs as pre-slaves. For example, the identification code information of the battery pack 10a is 352, the identification code information of the battery pack 10b is 365, and the identification code information of the battery pack 10c is 477, and since the identification code information of the battery pack 10a is smaller than the identification code information of the battery pack 10b and the identification code information of the battery pack 10b is smaller than the identification code information of the battery pack 10c, the battery pack 10a may be determined as a pre-master, and the battery packs 10b and 10c may be determined as pre-slaves. In another embodiment of the present application, the battery pack having the largest identification code information may be determined as a pre-master, and the remaining battery packs may be determined as pre-slaves.
In one embodiment, after the setting of the pre-master and the pre-slave is completed, whether the parallel battery pack 10 meets the condition of starting output is further determined according to the state information of the master and the slave; when the parallel battery pack 10 meets the condition of starting output, the pre-master machine 10a is controlled to start output, and after the pre-master machine 10a successfully starts output, a starting instruction is sent to each pre-slave machine 10b and 10c to control each pre-slave machine 10b and 10c to start output.
For example, the pre-master 10a reads the state information of each pre-slave 10b and 10c, and then determines whether the parallel battery pack 10 satisfies the condition of turning on the output according to the state information of the pre-master 10a and the state information of each pre-slave 10b and 10c, and controls the output state of the parallel battery pack based on the determination result. The state information of each of the battery packs 10a-10c may include voltage information, current information, temperature information, fault state information, etc. of the battery packs.
In one embodiment, the determination of whether the parallel battery pack 10 satisfies the condition of the on output may be specifically realized by: judging whether the voltage difference between any two battery packs in the parallel battery packs 10 is smaller than a preset value according to the state information of each battery pack 10a-10c, and judging whether a faulty battery pack exists in the parallel battery packs 10 according to the state information of each battery pack 10a-10 c; when the voltage difference between any two battery packs in the parallel battery packs 10 is smaller than the preset value and no faulty battery pack exists in the parallel battery packs 10, judging that the parallel battery packs 10 meet the condition of starting output; when the voltage difference between two battery packs in the parallel battery pack 10 is not less than the preset value, judging that the parallel battery pack 10 does not meet the condition of starting output; when there is a faulty battery pack in the parallel battery packs 10, it is determined that the parallel battery packs 10 do not satisfy the condition for turning on the output. The preset value may be set in an actual application scene, for example, according to the current specification of the contactor in the circuit, if the voltage difference between the two battery packs is too large, an instantaneous large current load phenomenon may occur after the output is turned on, and the hardware of the battery management system 30 may be damaged.
It can be understood that, since the state information of each of the battery packs 10a to 10c includes the voltage information, the current information, the temperature information, the fault state information, and the like of the battery pack, it can be further realized to determine whether the voltage difference between any two battery packs in the parallel battery packs 10 is smaller than a preset value and determine whether a faulty battery pack exists in the parallel battery packs 10 according to the state information of each of the battery packs 10a to 10 c.
It can be understood that, taking the parallel battery pack 10 including three battery packs 10a-10c as an example, it is necessary to determine whether the voltage difference between the battery packs 10a and 10b is smaller than the preset value, determine whether the voltage difference between the battery packs 10b and 10c is smaller than the preset value, and determine whether the voltage difference between the battery packs 10a and 10c is smaller than the preset value. When the voltage difference between the battery packs 10a and 10b is smaller than the preset value, the voltage difference between the battery packs 10b and 10c is smaller than the preset value, and the voltage difference between the battery packs 10a and 10c is smaller than the preset value, it indicates that the voltage difference between any two battery packs in the parallel battery packs 10 is smaller than the preset value.
In one embodiment, after the pre-master 10a and the pre-slaves 10b and 10c are turned on to output, the energy storage inverter 20 is activated, and it is further determined which battery pack of the plurality of battery packs 10a to 10c is the master in the physical sense of the parallel battery pack 10 and which battery pack is the slave in the physical sense of the parallel battery pack 10, so as to complete the parallel operation of the battery packs 10a to 10 c. When the energy storage inverter 20 is activated and finishes starting, the energy storage inverter 20 may periodically send a master indication signal, and when any battery pack receives the master indication signal, the battery pack is set as a master in a physical sense, and the remaining battery packs are set as slaves in the physical sense.
In one embodiment, setting the physical master and slave may be implemented as follows: judging whether the pre-host 10a receives a host identification signal sent by an energy storage inverter 20 within a preset time, setting the pre-host 10a as a host of the parallel battery pack 10 when the pre-host 10a receives the host identification signal sent by the energy storage inverter 20 within the preset time, and setting the pre-host 10a as a slave of the parallel battery pack 10 when the pre-host 10a does not receive the host identification signal sent by the energy storage inverter 20 within the preset time; and judging whether the plurality of pre-slave machines 10b and 10c receive the master identification signal sent by the energy storage inverter 20 within the preset time, setting the pre-slave machine 10b as the master of the parallel battery pack 10 when the pre-slave machine 10b receives the master identification signal sent by the energy storage inverter 20 within the preset time, and setting the pre-slave machine 10b as the slave of the parallel battery pack 10 when the pre-slave machine 10b does not receive the master identification signal sent by the energy storage inverter 20 within the preset time. It is understood that the judgment rule of the pre-slave 10c is the same as that of the pre-slave 10b, and is not described in detail here.
In the following, an example will be described in which the pre-master 10a is set as the master of the parallel battery pack 10, and the pre-slaves 10b and 10c are set as the slaves of the parallel battery pack 10. When the parallel battery pack 10 completes master and slave setting, the sum of the currents of the master 10a and each of the slaves 10b, 10c may be set as the current of the parallel battery pack 10, the lowest state of charge parameter in the master 10a and slaves 10b, 10c may be set as the state of charge parameter of the parallel battery packs 10, the highest temperature in the master 10a and slaves 10b, 10c may be set to the highest temperature of the parallel battery pack 10, the lowest temperature among the master 10a and slaves 10b and 10c may be set as the lowest temperature of the parallel battery packs 10, the maximum cell voltage in the master 10a, the slaves 10b, 10c may be set as the maximum cell voltage of the parallel battery pack 10, and the minimum cell voltage in the master 10a, the slaves 10b, 10c may be set as the minimum cell voltage of the parallel battery pack 10. When the parallel battery pack 10 is in a charged state, the maximum voltage among the master 10a, slaves 10b, 10c may be set to the voltage of the parallel battery pack 10; when the parallel battery pack 10 is in a discharge state, the minimum voltage among the master 10a, slaves 10b, 10c may be set to the voltage of the parallel battery pack 10.
In one embodiment, after the parallel battery packs 10 complete the setting of the master and the slave, the master 10a is controlled to obtain the status information of each slave 10b, 10c, and whether a faulty battery pack exists in the parallel battery packs 10 is determined according to the status information of the master 10a and the status information of each slave 10b, 10 c; when the master machine 10a is a faulty battery pack, the output of each slave machine 10b and 10c is shut off, and when a plurality of slave machines 10b and 10c have faulty battery packs, the outputs of the master machine 10a and the rest of the slave machines which normally operate are shut off, so that damage to other normal battery packs caused by faulty battery packs in the parallel battery packs 10 after the setting of the master machine and the slave machines is completed is avoided.
According to the parallel battery pack control method, when the parallel battery packs are started, each battery pack randomly generates an ID value and carries out ID competition, so that each battery pack is divided into the pre-master machine or the pre-slave machine, meanwhile, the pre-master machine is used for controlling other pre-slave machines to be started and output to activate the energy storage inverter, and then the final physical master machine and the final physical slave machine are determined according to the master machine identification information sent by the energy storage inverter, so that the automatic parallel operation success of the battery packs is realized, the parallel operation is realized without adding extra hardware, the parallel operation failure caused by hardware operation errors can be avoided, the error rate of the parallel operation is reduced, and meanwhile, the production and maintenance.
Fig. 3 is a schematic diagram of a parallel battery pack control apparatus 100 according to an embodiment of the present application. The parallel battery pack control apparatus 100 includes a memory 101, a processor 102, and a computer program, such as a parallel battery pack control system 103, stored in the memory 101 and executable on the processor 102.
The processor 102, when executing the computer program, implements the steps in the above-described parallel battery pack control method embodiments, such as steps S21-S23 shown in fig. 2.
Referring also to fig. 4, in one embodiment, the parallel battery control system 103 may be divided into one or more modules, and the one or more modules may be stored in the memory 101 and executed by the processor 102 to complete the present application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the parallel battery control system 103 in the parallel battery control apparatus 100. For example, the parallel battery pack control system 103 may be divided into the acquisition module 1031, the control module 1032, and the determination module 1033 in fig. 4.
The obtaining module 1031 is configured to obtain the identification code information of the battery pack 10a (taking 10a as an example) and the time interval for sending the identification code instruction when the parallel battery pack 10 is powered on.
The control module 1032 is configured to control the battery pack 10a to send the identification code instruction to the other battery packs 10b and 10c according to the time interval.
The determining module 1033 is configured to determine that one of the battery packs is a pre-master and the other battery packs are pre-slaves according to the identification code information of each of the battery packs 10a to 10 c.
After the setting of the pre-master and the pre-slave is completed, the physical master and the physical slave can be continuously determined, and specific contents can be referred to the above embodiment of the parallel battery pack control method, and are not described in detail herein.
In an embodiment, the Processor 102 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor 102 may be any other conventional processor or the like.
The memory 101 may include random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The modules integrated by the parallel battery pack control apparatus 100 may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the methods described above can be realized. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
According to the parallel battery pack control device, when the parallel battery packs are started, each battery pack randomly generates an ID value and carries out ID competition, so that each battery pack is divided into the pre-master machine or the pre-slave machine, meanwhile, the pre-master machine is used for controlling other pre-slave machines to be started and output to activate the energy storage inverter, and then the final physical master machine and the final physical slave machine are determined according to the master machine identification information sent by the energy storage inverter, so that the automatic parallel operation success of the battery packs is realized, the parallel operation is realized without adding extra hardware, the parallel operation failure caused by hardware operation errors can be avoided, the error rate of the parallel operation is reduced, and meanwhile, the production and maintenance.
It is understood that the above described division of modules is only one logical division, and that in actual implementation, there may be other divisions. In addition, functional modules in the embodiments of the present application may be integrated into the same processing unit, or each module may exist alone physically, or two or more modules are integrated into the same unit. The integrated module can be realized in a hardware form, and can also be realized in a form of hardware and a software functional module.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (15)
1. A parallel battery pack control method, the parallel battery pack including a plurality of battery packs connected in parallel, characterized by comprising the steps of:
when the parallel battery pack is started, acquiring identification code information of the battery pack and a time interval for sending an identification code instruction;
controlling the battery pack to send the identification code instruction to other battery packs according to the time interval; and
and determining one battery pack as a pre-master and the rest battery packs as pre-slaves according to the identification code information of each battery pack.
2. The parallel battery pack control method of claim 1, wherein the step of acquiring identification code information of a battery pack and a time interval for transmitting an identification code command comprises:
selecting a random value from a battery management system, and generating a first random number and a second random number according to the random value; and
setting the first random number as identification code information of the battery pack, and setting the second random number as a time interval at which the battery pack repeatedly transmits an identification code instruction.
3. The parallel battery pack control method of claim 2, wherein the step of selecting a random value from the battery management system and generating a first random number and a second random number according to the random value comprises:
selecting a random value from a battery management system according to a sampling value of an analog-to-digital converter of the battery pack; and
and generating the first random number and the second random number according to the random value.
4. The parallel battery pack control method according to claim 3, wherein the step of generating the first random number and the second random number according to the random value includes:
and inputting the random value serving as a random factor into a preset random function to generate the first random number and the second random number.
5. The parallel battery pack control method according to claim 1, wherein the step of controlling the battery pack to transmit the identification code command to the other battery packs according to the time interval further comprises:
when the battery pack receives the identification code instructions of other battery packs, the battery pack informs the self identification code information of the battery pack to the other battery packs and stops broadcasting the self identification code information outwards.
6. The parallel battery pack control method according to claim 1, wherein the step of determining one of the battery packs as a pre-master and the remaining battery packs as pre-slaves according to the identification code information of each of the battery packs further comprises the steps of:
the pre-master machine reads the state information of each pre-slave machine;
judging whether the parallel battery pack meets the condition of starting output or not according to the state information of the pre-master machine and the state information of each pre-slave machine; and
and controlling the output state of the parallel battery pack based on the judgment result.
7. The parallel battery pack control method according to claim 6, wherein the step of determining whether the parallel battery pack satisfies a condition for turning on an output according to the state information of the pre-master and the state information of each pre-slave includes:
judging whether the voltage difference between any two battery packs in the parallel battery packs is smaller than a preset value according to the state information of each battery pack;
judging whether a faulty battery pack exists in the parallel battery packs according to the state information of each battery pack; and
and when the voltage difference between any two battery packs in the parallel battery packs is smaller than the preset value and no faulty battery pack exists in the parallel battery packs, judging that the parallel battery packs meet the condition of starting output.
8. The parallel battery pack control method according to claim 6, wherein the step of controlling the output state of the parallel battery pack based on the determination result includes:
when the parallel battery pack meets the condition of starting output, controlling the pre-host to start output; and
and after the pre-master successfully starts the output, sending a starting-up instruction to each pre-slave machine so as to control each pre-slave machine to start the output.
9. The parallel battery control method of claim 8, further comprising:
judging whether the pre-host receives a host identification signal sent by the inverter within a preset time;
when the pre-host receives a host identification signal sent by the inverter within the preset time, setting the pre-host as a host of the parallel battery pack;
when the pre-master does not receive the master identification signal sent by the inverter within the preset time, setting the pre-master as a slave of the parallel battery pack;
judging whether a plurality of pre-slave machines receive a host identification signal sent by the inverter within the preset time;
when a pre-slave machine receives a host identification signal sent by the inverter within the preset time, setting the pre-slave machine as a host of the parallel battery pack; and
when a pre-slave machine does not receive the host identification signal sent by the inverter within the preset time, the pre-slave machine is set as a slave machine of the parallel battery pack.
10. The parallel battery control method of claim 9, further comprising:
controlling the host to acquire the state information of each slave;
judging whether a faulty battery pack exists in the parallel battery packs or not according to the state information of the host and the state information of each slave;
when the master machine is a fault battery pack, the output of each slave machine is closed; and
and when the plurality of the slave machines have the fault battery packs, the output of the master machine and the rest of the slave machines which normally operate is closed.
11. The parallel battery control method of claim 9, further comprising:
when the parallel battery pack completes the setting of a master machine and a slave machine, setting the sum of the currents of the master machine and each slave machine as the current of the parallel battery pack, setting the lowest charge state parameter of the master machine and a plurality of slave machines as the charge state parameter of the parallel battery pack, setting the highest temperature of the master machine and a plurality of slave machines as the highest temperature of the parallel battery pack, setting the lowest temperature of the master machine and a plurality of slave machines as the lowest temperature of the parallel battery pack, setting the maximum battery voltage of the master machine and a plurality of slave machines as the maximum battery voltage of the parallel battery pack, and setting the minimum battery voltage of the master machine and a plurality of slave machines as the minimum battery voltage of the parallel battery pack;
setting the maximum voltage of the master machine and the plurality of slave machines as the voltage of the parallel battery pack when the parallel battery pack is in a charging state; and
setting a minimum voltage of the master and the plurality of slaves to a voltage of the parallel battery pack when the parallel battery pack is in a discharge state.
12. The parallel battery pack control method according to claim 1, wherein the step of controlling the battery pack to transmit the identification code command to the other battery packs according to the time interval comprises:
controlling the battery pack to send the identification code instruction to other battery packs, and timing the sending time and counting the sending times;
judging whether the battery pack receives identification code information of other battery packs, if not, judging whether the sending time is greater than the time interval and whether the sending times is less than preset times;
when the sending time is greater than the time interval and the sending times are less than the preset times, controlling the battery pack to send the identification code instruction to other battery packs again, re-timing the sending time, and adding one to the sending times;
and outputting parallel operation abnormity warning information when the battery pack does not receive the identification code information of other battery packs and the sending times is not less than the preset times.
13. The parallel battery pack control method according to claim 1, wherein the step of determining one of the battery packs as a pre-master and the remaining battery packs as pre-slaves according to the identification code information of each of the battery packs comprises:
comparing the size of the identification code information of each battery pack, determining the battery pack with the minimum identification code information as a pre-master machine, and determining the rest battery packs as pre-slave machines; or
And comparing the size of the identification code information of each battery pack, determining the battery pack with the maximum identification code information as a pre-master machine, and determining the rest battery packs as pre-slave machines.
14. A parallel battery control system comprising computer program instructions for loading execution by a parallel battery control apparatus to control the parallel battery control apparatus to perform the parallel battery control method of any of claims 1-13.
15. A parallel battery pack control apparatus, comprising:
a memory for storing computer program instructions; and
a processor for loading the computer program instructions to perform the parallel battery control method of any of claims 1-13.
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