CN110783989A - Control method for parallel operation of battery packs and related device - Google Patents
Control method for parallel operation of battery packs and related device Download PDFInfo
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- CN110783989A CN110783989A CN201911088634.6A CN201911088634A CN110783989A CN 110783989 A CN110783989 A CN 110783989A CN 201911088634 A CN201911088634 A CN 201911088634A CN 110783989 A CN110783989 A CN 110783989A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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Abstract
The application discloses a control method for parallel operation of battery packs, which comprises the steps of obtaining battery parameters of each battery pack after receiving a power converter starting instruction, and determining the electric quantity relation of each battery pack based on the battery parameters; closing an output switch corresponding to the battery pack with the maximum electric quantity to access the battery pack with the maximum electric quantity; when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing an output switch corresponding to the battery pack to be accessed to access the battery pack to be accessed; and after receiving a power converter closing instruction, disconnecting the output switch corresponding to each accessed battery pack. The control method can effectively avoid charging and discharging between the battery packs, reduce the electric quantity loss of the battery packs and prolong the service life of the battery packs. The application also discloses a control device, equipment and a computer readable storage medium for parallel operation of the battery packs, which have the technical effects.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a control method for parallel operation of battery packs; also relates to a control device, equipment and a computer readable storage medium for parallel operation of the battery packs.
Background
The energy storage system comprises a power converter, an energy manager, a battery management system and a battery pack (consisting of battery cells connected in series). The power converter is used for completing the DA-AC inversion function and the AC-DC charging function, the energy manager is mainly used for completing the control function of the energy storage system, and the battery management system is mainly used for managing each battery pack. The design of the energy storage system needs to consider the requirement of capacity expansion of the system, a plurality of battery packs are required to be connected in parallel at the moment, and the parallel connection of the battery packs is the parallel connection of large current, so the difference between the internal resistance of a cable and the internal resistance of a contact cannot be ignored, the difference between the internal resistance of the cable and the internal resistance of the contact can cause the discharging current of each battery pack to be uneven when the battery packs are used, the uneven discharging current can cause the difference between the voltage and the charge state of the battery packs after the battery packs stop discharging, and then the possibility that the battery packs with high voltage charge the battery packs with low voltage exists.
Therefore, how to avoid charging and discharging between battery packs as much as possible, reduce the power consumption of the battery packs, and prolong the service life of the battery packs has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The purpose of the application is to provide a control method for parallel operation of battery packs, which can effectively avoid charge and discharge among the battery packs, reduce the electric quantity loss of the battery packs and prolong the service life of the battery packs; another object of the present application is to provide a control device, an apparatus and a computer readable storage medium for parallel operation of battery packs, all having the above technical effects.
In order to solve the above technical problem, the present application provides a method for controlling parallel operation of battery packs, including:
after a power converter starting instruction is received, battery parameters of each battery pack are obtained, and the electric quantity relation of each battery pack is determined based on the battery parameters;
closing an output switch corresponding to the battery pack with the maximum electric quantity to access the battery pack with the maximum electric quantity;
when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing the output switch corresponding to the battery pack to be accessed to access the battery pack to be accessed;
and after a power converter closing instruction is received, the output switches corresponding to the accessed battery packs are disconnected.
Optionally, the battery parameter is a battery voltage;
correspondingly, the determining the magnitude relation of the electric quantity of each battery pack based on the electric energy parameters includes:
and determining the magnitude relation of the cell voltages of the battery packs.
Optionally, the battery parameter is a state of charge;
correspondingly, the determining the magnitude relation of the electric quantity of each battery pack based on the electric energy parameters includes:
and determining the magnitude relation of the charge states of the battery packs.
Optionally, the obtaining battery parameters of each battery pack includes:
and receiving the battery parameters of the battery pack detected by a battery management system.
Optionally, the battery management system corresponds to the battery pack one to one.
Optionally, the output switch is any one of a relay, a contactor, an MOS transistor, and a triode.
In order to solve the above technical problem, the present application further provides a control device for parallel operation of battery packs, including:
the acquisition module is used for acquiring the battery parameters of each battery pack after receiving a power converter starting instruction;
the determining module is used for determining the electric quantity relation of each battery pack based on the battery parameters;
the closing module is used for closing the output switch corresponding to the battery pack with the maximum electric quantity so as to access the battery pack with the maximum electric quantity; when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing the output switch corresponding to the battery pack to be accessed so as to access the battery pack to be accessed;
and the disconnection module is used for disconnecting the output switches corresponding to the accessed battery packs after receiving a power converter closing instruction.
Optionally, the obtaining module is specifically configured to receive a battery parameter of the battery pack detected by a battery management system.
In order to solve the above technical problem, the present application further provides a control device for parallel operation of battery packs, including:
a memory for storing a computer program;
a processor for implementing the steps of the control method for parallel operation of the battery packs as described above when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer-readable storage medium storing a computer program, which when executed by a processor, implements the steps of the method for controlling parallel operation of battery packs as described above.
The control method for parallel operation of the battery packs comprises the steps of obtaining battery parameters of each battery pack after receiving a power converter starting instruction, and determining the electric quantity relation of each battery pack based on the battery parameters; closing an output switch corresponding to the battery pack with the maximum electric quantity to access the battery pack with the maximum electric quantity; when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing the output switch corresponding to the battery pack to be accessed to access the battery pack to be accessed; and after a power converter closing instruction is received, the output switches corresponding to the accessed battery packs are disconnected.
Therefore, the control method for parallel operation of the battery packs provided by the application receives the starting instruction of the power converter and then sequentially accesses the battery packs according to the electric quantity of the battery packs, so that mutual charging and discharging of the battery packs caused by simultaneous access of the battery packs is effectively avoided. After the power converter closing instruction is received, the output switches corresponding to the battery packs are simultaneously disconnected, so that charging and discharging paths cannot be formed among the battery packs, and the battery packs are prevented from being charged and discharged mutually. The control method can effectively avoid charging and discharging between the battery packs, reduce the electric quantity loss of the battery packs, prolong the service life of the battery packs and improve the efficiency of the energy storage system.
The control device, the equipment and the computer readable storage medium for parallel operation of the battery packs have the technical effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for controlling parallel operation of battery packs according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of parallel operation of battery packs according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a control device for parallel operation of battery packs according to an embodiment of the present disclosure.
Detailed Description
The core of the application is to provide a control method for parallel operation of the battery packs, which can effectively avoid charge and discharge among the battery packs, reduce the electric quantity loss of the battery packs and prolong the service life of the battery packs; another core of the present application is to provide a control device, an apparatus and a computer readable storage medium for parallel operation of battery packs, all having the above technical effects.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a control method for parallel operation of battery packs according to an embodiment of the present disclosure; referring to fig. 1, the control method includes:
s101: after a power converter starting instruction is received, battery parameters of each battery pack are obtained, and the electric quantity relation of each battery pack is determined based on the battery parameters;
specifically, the energy manager may determine whether a power converter start instruction is received in real time, and after receiving the power converter start instruction, first obtain battery parameters of each battery pack to determine the electric quantity relationship of each battery pack based on the battery parameters.
In a specific embodiment, the obtaining the battery parameters of each battery pack may include receiving the battery parameters of the battery pack detected by the battery management system.
Specifically, in the embodiment, the battery management system detects the battery parameters of the battery pack, and then the battery management system sends the detected battery parameters of the battery pack to the energy manager.
Further, referring to fig. 2, in a specific embodiment, the battery management systems correspond to the battery packs one to one, that is, the number of the battery packs is equal to the number of the battery management systems, each battery management system is responsible for detecting a battery parameter of one of the battery packs, and each battery management system finally sends the detected battery parameter of the battery pack to the energy manager. In fig. 2, PCS is a power converter, EMS is an energy manager, and BMS is a battery management system.
Of course, the above embodiment is only an example provided by the present application, and is not limited to the above embodiment, and a person skilled in the art may perform difference setting according to actual application needs, for example, the number of the battery management systems may also be 1, so as to detect the battery parameters of each battery pack by using the unique battery management system; or the energy manager is integrated with a battery parameter detection function of the battery pack, so that the energy manager acquires the battery parameters of each battery pack through detection.
In one embodiment, the battery parameter is a battery voltage; correspondingly, determining the magnitude relation of the electric quantity of each battery pack based on the electric energy parameters comprises determining the magnitude relation of the battery voltage of each battery pack.
Specifically, in this embodiment, the battery parameter of the battery pack acquired by the energy manager is specifically a battery voltage, and the battery voltages of the battery packs are further compared on the basis of acquiring the battery voltages of the battery packs, so as to determine the magnitude relationship between the battery voltages of the battery packs.
Further, in another specific embodiment, the battery parameter is a state of charge; correspondingly, determining the magnitude relation of the electric quantity of each battery pack based on the electric energy parameters comprises determining the magnitude relation of the state of charge of each battery pack.
Specifically, in this embodiment, the battery parameter of the battery pack acquired by the energy manager is specifically a state of charge, and on the basis of acquiring the state of charge of each battery pack, the state of charge of each battery pack is further compared to determine a magnitude relationship between the states of charge of each battery pack.
S102: closing an output switch corresponding to the battery pack with the maximum electric quantity to access the battery pack with the maximum electric quantity;
specifically, in order to avoid mutual charging and discharging between battery packs, on the basis of obtaining battery parameters of the battery packs and determining the relationship between the electric quantities of the battery packs, the output switch corresponding to the battery pack with the largest electric quantity is closed to access the battery pack with the largest electric quantity, and the battery pack discharges while the power converter works. Wherein, the battery pack corresponds to the output switch one by one. For the embodiment with the battery parameter being the battery voltage, the output switch corresponding to the battery pack with the highest battery voltage is closed, and for the embodiment with the battery parameter being the state of charge, the output switch corresponding to the battery pack with the highest state of charge is closed. In addition, the number of battery packs having the largest electric energy may be one or a plurality of battery packs, and if the number of battery packs having the largest electric energy is a plurality of battery packs, the output switches corresponding to the battery packs having the largest electric energy are simultaneously closed to simultaneously access the battery packs having the same electric energy and the largest electric energy.
S103: when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing an output switch corresponding to the battery pack to be accessed to access the battery pack to be accessed;
specifically, after the battery pack is accessed, the battery pack discharges and the electric quantity is continuously reduced, and when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, the output switch corresponding to the battery pack to be accessed is closed to access the battery pack to be accessed until all the battery packs are accessed.
For example, the battery packs include a first battery pack, a second battery pack and a third battery pack, and the battery voltages of the battery packs are different, the energy manager determines that the battery voltage of the first battery pack is the largest, the battery voltage of the third battery pack is the second smallest and the battery voltage of the second battery pack is the smallest by comparing the battery voltages of the battery packs, so the energy manager firstly closes the output switch corresponding to the first battery pack to access the first battery pack, when the battery voltage of the accessed first battery pack is reduced to be less than or equal to the battery voltage of the third battery pack, the output switch corresponding to the third battery pack is closed to access the second battery pack, at this time, the accessed battery packs include the first battery pack and the third battery pack, the first battery pack and the third battery pack are both discharged, when the battery voltages of the first battery pack and the third battery pack are reduced to be less than or equal to the battery voltage of the second battery pack, and closing the output switch corresponding to the second battery pack to finally access the second battery pack, thereby achieving the purpose of finally accessing each battery pack and preventing the accessed battery packs from being charged and discharged mutually.
S104: and after a power converter closing instruction is received, the output switches corresponding to the accessed battery packs are disconnected.
Specifically, after the output switches corresponding to the battery packs are closed by the energy manager, whether a power converter closing instruction is received or not is further judged in real time, and after the power converter closing instruction is received, the output switches corresponding to the accessed battery packs are disconnected, at this time, the circuit is disconnected between the battery packs and the power converter, and the battery packs cannot be charged or discharged.
The specific type of the output switch is not limited uniquely, and the output switch may be any one of a relay, a contactor, an MOS transistor, and a transistor. In addition, for the embodiment in which the power management system corresponds to the battery packs one to one as shown in fig. 2, the energy manager may implement control of the output switches by sending a control instruction to the power management system to close or open the corresponding output switches through the power management system.
In summary, the control method for parallel operation of battery packs provided by the present application accesses the battery packs in sequence according to the magnitude relationship of the electric quantities of the battery packs after receiving the start instruction of the power converter, thereby effectively avoiding mutual charging and discharging between the battery packs caused by accessing the battery packs at the same time. After the power converter closing instruction is received, the output switches corresponding to the battery packs are simultaneously disconnected, so that charging and discharging paths cannot be formed among the battery packs, and the battery packs are prevented from being charged and discharged mutually. The control method can effectively avoid charging and discharging between the battery packs, reduce the electric quantity loss of the battery packs, prolong the service life of the battery packs and improve the efficiency of the energy storage system.
The present application also provides a control device for parallel operation of battery packs, which is described below and to which the above-described method can be mutually and correspondingly referred. Referring to fig. 3, the control device includes:
the acquiring module 10 is used for acquiring battery parameters of each battery pack after receiving a power converter starting instruction;
a determining module 20, configured to determine a relationship between electric quantities of the battery packs based on the battery parameters;
the closing module 30 is used for closing the output switch corresponding to the battery pack with the maximum electric quantity so as to access the battery pack with the maximum electric quantity; when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing an output switch corresponding to the battery pack to be accessed so as to access the battery pack to be accessed;
and the disconnection module 40 is configured to disconnect the output switch corresponding to each connected battery pack after receiving a power converter shutdown instruction.
On the basis of the above embodiment, as a specific implementation manner, the battery parameter is a battery voltage; correspondingly, the determining module 20 is specifically configured to determine the magnitude relationship of the battery voltages of the battery packs.
On the basis of the above embodiment, as a specific implementation manner, the battery parameter is a state of charge; correspondingly, the determining module 20 is specifically configured to determine the magnitude relationship between the states of charge of the battery packs.
On the basis of the foregoing embodiment, as a specific implementation manner, the obtaining module 10 is specifically configured to receive the battery parameters of the battery pack detected by the battery management system.
The application also provides a control device for parallel operation of battery packs, comprising: a memory and a processor; wherein the memory is used for storing a computer program; the processor is configured to implement the following steps when executing the computer program:
after a power converter starting instruction is received, battery parameters of each battery pack are obtained, and the electric quantity relation of each battery pack is determined based on the battery parameters; closing an output switch corresponding to the battery pack with the maximum electric quantity to access the battery pack with the maximum electric quantity; when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing the output switch corresponding to the battery pack to be accessed to access the battery pack to be accessed; and after a power converter closing instruction is received, the output switches corresponding to the accessed battery packs are disconnected.
For the introduction of the device provided in the present application, please refer to the embodiment of the above method, which is not described herein again.
The present application further provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
after a power converter starting instruction is received, battery parameters of each battery pack are obtained, and the electric quantity relation of each battery pack is determined based on the battery parameters; closing an output switch corresponding to the battery pack with the maximum electric quantity to access the battery pack with the maximum electric quantity; when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing the output switch corresponding to the battery pack to be accessed to access the battery pack to be accessed; and after a power converter closing instruction is received, the output switches corresponding to the accessed battery packs are disconnected.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For the introduction of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments, which are not described herein again.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed by the embodiments correspond to the method disclosed by the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, the device, the equipment and the computer readable storage medium for controlling the parallel operation of the battery packs provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. A control method for parallel operation of battery packs is characterized by comprising the following steps:
after a power converter starting instruction is received, battery parameters of each battery pack are obtained, and the electric quantity relation of each battery pack is determined based on the battery parameters;
closing an output switch corresponding to the battery pack with the maximum electric quantity to access the battery pack with the maximum electric quantity;
when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing the output switch corresponding to the battery pack to be accessed to access the battery pack to be accessed;
and after a power converter closing instruction is received, the output switches corresponding to the accessed battery packs are disconnected.
2. The method of claim 1, wherein the battery parameter is a battery voltage;
correspondingly, the determining the magnitude relation of the electric quantity of each battery pack based on the electric energy parameters includes:
and determining the magnitude relation of the cell voltages of the battery packs.
3. The method of claim 1, wherein the battery parameter is state of charge;
correspondingly, the determining the magnitude relation of the electric quantity of each battery pack based on the electric energy parameters includes:
and determining the magnitude relation of the charge states of the battery packs.
4. The method for controlling parallel operation of battery packs according to claim 3, wherein the obtaining battery parameters of each battery pack comprises:
and receiving the battery parameters of the battery pack detected by a battery management system.
5. The method of claim 4, wherein the battery management systems are in one-to-one correspondence with the battery packs.
6. The method for controlling parallel operation of battery packs according to claim 5, wherein the output switch is any one of a relay, a contactor, a MOS transistor and a triode.
7. A control device for parallel operation of battery packs, comprising:
the acquisition module is used for acquiring the battery parameters of each battery pack after receiving a power converter starting instruction;
the determining module is used for determining the electric quantity relation of each battery pack based on the battery parameters;
the closing module is used for closing the output switch corresponding to the battery pack with the maximum electric quantity so as to access the battery pack with the maximum electric quantity; when the electric quantity of the accessed battery pack is reduced to be equal to or less than the electric quantity of the battery pack to be accessed, closing the output switch corresponding to the battery pack to be accessed so as to access the battery pack to be accessed;
and the disconnection module is used for disconnecting the output switches corresponding to the accessed battery packs after receiving a power converter closing instruction.
8. The device for controlling parallel operation of battery packs according to claim 7, wherein the obtaining module is specifically configured to receive the battery parameters of the battery packs detected by a battery management system.
9. A control apparatus for parallel operation of battery packs, comprising:
a memory for storing a computer program;
a processor for implementing the steps of a method of controlling parallel operation of battery packs according to any one of claims 1 to 6 when executing said computer program.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the steps of the control method of parallel operation of battery packs according to any one of claims 1 to 6.
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| CN201911088634.6A CN110783989A (en) | 2019-11-08 | 2019-11-08 | Control method for parallel operation of battery packs and related device |
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| CN201911088634.6A CN110783989A (en) | 2019-11-08 | 2019-11-08 | Control method for parallel operation of battery packs and related device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111431228A (en) * | 2020-03-27 | 2020-07-17 | 东莞新能安科技有限公司 | Parallel battery pack charging and discharging management method and electronic device |
| JP2022530291A (en) * | 2020-03-27 | 2022-06-29 | 東莞新能安科技有限公司 | Charging / discharging management method for parallel connection battery set, electronic device and electrical system |
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| CN102082307A (en) * | 2010-12-31 | 2011-06-01 | 华为技术有限公司 | Method and system for parallel use of lithium battery modules |
| CN102231546A (en) * | 2011-06-30 | 2011-11-02 | 武汉市菱电汽车电子有限责任公司 | Battery management system with balanced charge and discharge functions and control method thereof |
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| EP0851556A2 (en) * | 1996-12-26 | 1998-07-01 | Japan Tobacco Inc. | Battery charger |
| CN102082307A (en) * | 2010-12-31 | 2011-06-01 | 华为技术有限公司 | Method and system for parallel use of lithium battery modules |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111431228A (en) * | 2020-03-27 | 2020-07-17 | 东莞新能安科技有限公司 | Parallel battery pack charging and discharging management method and electronic device |
| JP2022530291A (en) * | 2020-03-27 | 2022-06-29 | 東莞新能安科技有限公司 | Charging / discharging management method for parallel connection battery set, electronic device and electrical system |
| JP7244635B2 (en) | 2020-03-27 | 2023-03-22 | 東莞新能安科技有限公司 | Charge/discharge management method, electronic device, and electrical system for parallel-connected battery set |
| US11949273B2 (en) | 2020-03-27 | 2024-04-02 | Dongguan Poweramp Technology Limited | Method for managing charging and discharging of parallel-connected battery pack, electronic device, and electrical system |
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Application publication date: 20200211 |