CN115498747A - Energy storage parallel operation equipment and energy storage parallel operation method - Google Patents
Energy storage parallel operation equipment and energy storage parallel operation method Download PDFInfo
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- CN115498747A CN115498747A CN202211462847.2A CN202211462847A CN115498747A CN 115498747 A CN115498747 A CN 115498747A CN 202211462847 A CN202211462847 A CN 202211462847A CN 115498747 A CN115498747 A CN 115498747A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 68
- 238000007599 discharging Methods 0.000 claims description 20
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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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- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- H02J7/36—Arrangements using end-cell switching
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The embodiment of the application discloses energy storage parallel operation equipment and an energy storage parallel operation method, and relates to the field of power supplies. The energy storage parallel operation equipment comprises a main battery pack, a secondary battery pack, a detection device, a control device and a switching device; the detection device is respectively connected with the main battery pack, the slave battery pack and the control device, and the switching device is respectively connected with the main battery pack, the slave battery pack and the control device; the main battery pack is used for supplying power to a load or charging through a charging power supply, and the auxiliary battery pack is used as a loading pack of the main battery pack; the detection device is used for sending the acquired detection information to the control device; the control device is used for controlling the slave battery pack to charge the master battery pack through the switching device according to the received detection information, or controlling the charging state of the slave battery pack through the switching device; when the voltage of the main battery pack and the voltage of the auxiliary battery pack are both in the parallel operation voltage range, the switching device performs parallel operation on the main battery pack and the auxiliary battery pack.
Description
Technical Field
The invention relates to the field of power supplies, in particular to energy storage parallel operation equipment and an energy storage parallel operation method.
Background
Parallel operation means that a plurality of power supplies in a running state are connected in parallel to form a large-capacity power supply for charging and discharging. With the rapid development of battery technology, lithium battery packs are widely used as power supply devices for various energy storage devices. A single battery pack power supply is limited by capacity and cannot be applied to a scene of long-time power utilization, and a plurality of slave power supplies and a main power supply are usually connected in parallel to obtain a larger power supply device so as to realize long-time power utilization. However, since there is a difference in the actual voltage of each battery power supply, there is a voltage difference from the slave power supply to the master power supply. In the parallel operation process of the battery pack power supply, the operation state of the main power supply needs to be adjusted, otherwise, the parallel operation of the slave power supply and the main power supply cannot be realized.
When the main power supply discharges continuously, if the running state of the main power supply is not switched, the voltage difference between the main power supply and the slave power supply can cause that the slave power supply cannot be connected to the main power supply, and the slave power supply and the main power supply cannot be parallel. Specifically, in the parallel operation process of the slave power supply and the master power supply, if the voltage of the slave power supply is higher than the voltage of the master power supply, the master power supply needs to be adjusted to be in an off state, so that the master power supply does not supply power to the load any more. And meanwhile, connecting the slave power supply with the load, switching the slave power supply to an on state for discharging until the voltage of the master power supply and the voltage of the slave power supply are both in the parallel operation voltage range, and then performing parallel operation on the master power supply and the slave power supply. Due to the fact that the power supply operation state needs to be switched in the power supply parallel operation process, the load connected with the power supply is briefly powered off, and therefore reliable operation of the load is affected.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an energy storage parallel operation device and an energy storage parallel operation method to solve the problem that the operation state of a main battery pack needs to be switched in the parallel operation process of the battery packs.
In a first aspect, the present application provides an energy storage parallel operation device, including a master battery pack, a slave battery pack, a detection apparatus, a control apparatus, and a switching apparatus;
the detection device is respectively connected with the main battery pack, the slave battery pack and the control device, and the switching device is respectively connected with the main battery pack, the slave battery pack and the control device;
the main battery pack is used for supplying power to a load or charging through a charging power supply, and the auxiliary battery pack is used as a loading pack of the main battery pack;
the detection device is used for sending acquired detection information to the control device, wherein the detection information comprises the charging and discharging state of the main battery pack, the voltage of the main battery pack and the voltage of the auxiliary battery pack;
the control device is used for sending a parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack if the main battery pack is determined to be in a discharging state based on the detection information and the voltage of the main battery pack is greater than the voltage of the slave battery pack;
the control device is further configured to send a first control instruction to the switching device if it is determined that the main battery pack is in a discharging state based on the detection information and the voltage of the main battery pack is smaller than the voltage of the slave battery pack, and send the parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack, where the first control instruction is used for controlling the slave battery pack to charge the main battery pack through the switching device;
and the switching device is used for performing parallel operation on the main battery pack and the auxiliary battery pack when the parallel operation instruction is received.
With reference to the first aspect, in a first possible implementation manner, the control device is further configured to send a parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack if it is determined that the main battery pack is in the charging state based on the detection information and the voltage of the main battery pack is smaller than the voltage of the slave battery pack.
With reference to the first aspect, in a second possible implementation manner, the control device is further configured to send a second control instruction to the switching device if it is determined that the master battery pack is in the charging state based on the detection information, the slave battery pack is not in the charging state, and the voltage of the master battery pack is greater than the voltage of the slave battery pack, and send a parallel operation instruction to the switching device according to the voltage of the master battery pack and the voltage of the slave battery pack, where the second control instruction is used to adjust the on-off states of the charging power supply and the slave battery pack through the switching device, and adjust the on-off states of the charging power supply and the master battery pack.
With reference to the first aspect, in a third possible implementation manner, the control device is further configured to adjust charging efficiencies of the master battery pack and the slave battery pack if it is determined that the master battery pack and the slave battery pack are both in a charging state based on the detection information and the voltage of the master battery pack is greater than the voltage of the slave battery pack, and send a parallel operation instruction to the switching device according to the voltage of the master battery pack and the voltage of the slave battery pack.
With reference to the first aspect, in a fourth possible implementation manner, the sending the parallel operation instruction to the switching device according to the voltage of the master battery pack and the voltage of the slave battery pack includes:
when the voltage of the main battery pack and the voltage of the auxiliary battery pack are both in a parallel operation voltage range, the control device sends a parallel operation instruction to the switching device.
With reference to the first aspect, in a fifth possible implementation manner, the method further includes: the device comprises an alternating current-direct current converter and a power interface;
one end of the alternating current-direct current converter is connected with the main battery pack, and the other end of the alternating current-direct current converter is connected with the power supply interface;
the alternating current-direct current converter is used for converting alternating current of the power interface into direct current.
With reference to the first aspect, in a sixth possible implementation manner, the method further includes: a maximum power point tracker and a photovoltaic interface;
one end of the maximum power point tracker is connected with the main battery pack, the other end of the maximum power point tracker is connected with the third end of the switching device, the fourth end of the switching device is connected with the photovoltaic interface, and the photovoltaic interface is used for being connected with photovoltaic equipment;
the maximum power point tracker is used for monitoring the power of the photovoltaic equipment in real time.
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the switching device includes a first switch, a second switch, and a third switch;
the one end of first switch is connected maximum power point tracker, the other end of first switch is connected from the battery package, the one end of second switch is connected photovoltaic interface, the other end of second switch is connected first switch with node between the maximum power point tracker, the one end of third switch is connected main battery package, the other end of third switch is connected first switch with node between the battery package from.
With reference to the first aspect, in an eighth possible implementation manner, the slave battery pack includes a protection sub-device;
the protection sub-device is respectively connected with the detection device and the switching device;
the protection sub-device is used for inhibiting surge current.
In a second aspect, the present application provides an energy storage parallel operation method, which is applied to the energy storage parallel operation device according to the first aspect, and the method includes:
sending detection information acquired by a detection device to a control device, wherein the detection information comprises the charging and discharging state of a main battery pack, the voltage of the main battery pack and the voltage of a slave battery pack;
if the main battery pack is determined to be in a discharging state based on the detection information, and the voltage of the main battery pack is larger than that of the slave battery pack, the control device sends a parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack;
if the main battery pack is determined to be in a discharging state based on the detection information, and the voltage of the main battery pack is smaller than that of the slave battery pack, the control device sends a first control instruction to the switching device, and sends the parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack, wherein the first control instruction is used for controlling the slave battery pack to charge the main battery pack through the switching device;
and when the switching device receives the parallel operation instruction, the switching device performs parallel operation on the main battery pack and the auxiliary battery pack.
The application provides energy storage parallel operation equipment which comprises a main battery pack, a secondary battery pack, a detection device, a control device and a switching device; the detection device is respectively connected with the main battery pack, the slave battery pack and the control device, and the switching device is respectively connected with the main battery pack, the slave battery pack and the control device; the main battery pack is used for supplying power to a load or charging through a charging power supply, and the auxiliary battery pack is used as a loading pack of the main battery pack; the detection device is used for sending the acquired detection information to the control device; the control device is used for controlling the slave battery pack to charge the master battery pack through the switching device or controlling the charging state of the slave battery pack through the switching device according to the received detection information; and the control device is also used for sending a parallel operation instruction to the switching device when the voltage of the main battery pack and the voltage of the slave battery pack are both in a parallel operation voltage range, and controlling the switching device to perform parallel operation on the main battery pack and the slave battery pack. In the process of parallel operation of the main battery pack and the slave battery pack, the operation state of the main battery pack does not need to be switched, so that the short-time stop operation of external equipment which is charged and discharged with the main battery pack is avoided, and the reliable operation of the external equipment is further ensured.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 shows a first structural schematic diagram of an energy storage parallel operation device provided in an embodiment of the present application;
fig. 2 shows a second structural schematic diagram of an energy storage parallel operation device provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram illustrating a switching device according to an embodiment of the present application;
fig. 4 shows a flowchart of an energy storage parallel operation method provided in an embodiment of the present invention.
Description of the main element symbols:
100-energy storage parallel operation equipment, 110-main battery pack, 120-auxiliary battery pack, 130-detection device, 140-control device, 150-switching device, 160-alternating current-direct current converter, 170-power interface, 180-maximum power point tracker, 190-photovoltaic interface, 121-protection sub-device, M1-first switch, M2-second switch and M3-third switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Example 1
Referring to fig. 1, fig. 1 illustrates a first structural schematic diagram of an energy storage parallel operation device according to an embodiment of the present application.
Exemplarily, the energy storage parallel operation apparatus 100 in fig. 1 includes a master battery pack 110, a slave battery pack 120, a detection device 130, a control device 140, and a switching device 150;
the detection device 130 is connected to the master battery pack 110, the slave battery pack 120, and the control device 140, respectively, and the switching device 150 is connected to the master battery pack 110, the slave battery pack 120, and the control device 140, respectively;
the master battery pack 110 is used for supplying power to a load or charging the load through a charging power supply, and the slave battery pack 120 is used as a loading pack of the master battery pack 110;
the detection device 130 is configured to send acquired detection information to the control device 140, where the detection information includes a charge/discharge state of the master battery pack 110, a voltage of the master battery pack 110, and a voltage of the slave battery pack 120;
the control device 140 is configured to send a parallel operation command to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 if it is determined that the master battery pack is in the discharging state based on the detection information and the voltage of the master battery pack 110 is greater than the voltage of the slave battery pack 120;
the control device 140 is further configured to send a first control instruction to the switching device 150 if it is determined that the master battery pack 110 is in a discharging state based on the detection information and the voltage of the master battery pack 110 is smaller than the voltage of the slave battery pack 120, and send the parallel operation instruction to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120, where the first control instruction is used for controlling the slave battery pack 120 to charge the master battery pack 110 through the switching device 150;
the switching device 150 is configured to perform parallel operation on the master battery pack 110 and the slave battery pack 120 when receiving the parallel operation instruction.
Specifically, when power needs to be supplied to the load, the main battery pack 110, the detection device 130, the control device 140, and the switching device 150 may form an independent energy storage device, and power is supplied to the load through the main battery pack 110. The types of the batteries included in the master battery pack 110 and the slave battery pack 120 are set according to actual needs, and may be lithium batteries, which is not limited herein. The single main battery pack 110 supplies power to the load, and is limited by the capacity of the main battery pack 110, and thus cannot be applied to a long-time power utilization scene. The slave battery pack 120 is used as a loading pack of the master battery pack 110, and the slave battery pack 120 and the master battery pack 110 are connected in parallel to obtain a power supply device with larger capacity. It should be understood that the energy storage device formed by the main battery pack 110, the detection device 130, the control device 140 and the switching device 150 may be disposed in a single housing. When the parallel operation of the battery packs is required, the slave battery pack 120 is connected to the master battery pack 110 through the switching device 150, so that the slave battery pack 120 is used as a loading pack of the master battery pack 110, and the parallel operation of the slave battery pack 120 and the master battery pack 110 is performed. When the parallel operation of the battery packs is not necessary, the connection between the slave battery pack 120 and the switching device 150 is cut off.
If the voltages of the master battery pack 110 and the slave battery pack 120 are the same, the control device 140 can directly control the switching device 150 to parallel the master battery pack 110 and the slave battery pack 120, and the operation state of the master battery pack 110 does not need to be adjusted. In an actual parallel operation process, a voltage difference between the master battery pack 110 and the slave battery pack 120 will cause that the master battery pack 110 and the slave battery pack 120 cannot be parallel operated. The detection device 130 is configured to obtain the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 in real time, and send the obtained voltages of the master battery pack 110 and the slave battery pack 120 to the control device 140.
The control device 140 is used for controlling the slave battery pack 120 to charge the master battery pack 110 through the switching device 150 or controlling the charging state of the slave battery pack 120 through the switching device 150 according to the received detection information. The voltage of the slave battery pack 120 is within the parallel operation voltage range by charging the master battery pack 110 from the slave battery pack 120 or by charging the slave battery pack 120.
When the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are both within the parallel operation voltage range, the control device 140 sends a parallel operation command to the switching device 150, wherein the parallel operation voltage range is set according to actual requirements, which is not limited herein. The switching device 150 connects the master battery pack 110 and the slave battery pack 120 in parallel according to the received parallel instruction, and performs parallel operation on the master battery pack 110 and the slave battery pack 120. In the process of parallel operation of the main battery pack 110 and the slave battery pack 120, the operation state of the main battery pack 110 does not need to be switched, so that the short-time stop operation of external equipment which is charged and discharged with the main battery pack 110 is avoided, and the reliable operation of the external equipment is further ensured.
Further, as an example, the control device 140 is further configured to send a parallel operation command to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 if it is determined that the master battery pack 110 is in the charging state based on the detection information and the voltage of the master battery pack 110 is less than the voltage of the slave battery pack 120.
If the master battery pack 110 is in a charging state and the voltage of the master battery pack 110 is lower than the voltage of the slave battery pack 120, the voltage of the master battery pack 110 needs to be increased and/or the voltage of the slave battery pack 120 needs to be decreased. Specifically, control device 140 does not send a control command to switching device 150, and the charging power supply continues to charge main battery pack 110, increasing the voltage of main battery pack 110. When the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are both within the parallel operation voltage range, the control device 140 sends a parallel operation command to the switching device 150, and controls the switching device 150 to perform parallel operation on the master battery pack 110 and the slave battery pack 120. After the master battery pack 110 and the slave battery pack 120 are combined, the charging power source charges the master battery pack 110 and the slave battery pack 120 together. On the basis of not switching the running state of the master battery pack 110, the parallel operation of the master battery pack 110 and the slave battery pack 120 is realized.
As an example, the control device 140 is further configured to send a second control command to the switching device 150 if it is determined that the master battery pack 110 is in the charging state, the slave battery pack 120 is not in the charging state, and the voltage of the master battery pack 110 is greater than the voltage of the slave battery pack 120 based on the detection information, and send a parallel operation command to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120, where the second control command is used to adjust the on-off states of the charging power source and the slave battery pack 120 and adjust the on-off states of the charging power source and the master battery pack 110 through the switching device 150.
When the charging power source charges the main battery pack 110, the detection device 130 acquires that the main battery pack 110 is in a charging state. Likewise, the detection device 130 also obtains the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 in real time. The control device 140 determines a voltage difference between the master battery pack 110 and the slave battery pack 120 according to the received voltage of the master battery pack 110 and the voltage of the slave battery pack 120. If the master battery pack 110 is in a charging state and the voltage of the master battery pack 110 is greater than the voltage of the slave battery pack 120, it is necessary to decrease the voltage of the master battery pack 110 and/or increase the voltage of the slave battery pack.
The control device 140 sends a second control command to the switching device 150, so that the switching device 150 adjusts the on/off states of the charging power source and the slave battery pack 120 according to the received second control command. The charging power supply and the slave battery pack 120 are switched from a disconnected state to a connected state, and the charging power supply charges the slave battery pack 120. In order to avoid adjustment of the operating state of the main battery pack 110, a short stop of the charging power supply for charging the main battery pack 110 occurs.
It should be understood that, if it is necessary to perform parallel operation on the master battery pack 110 and the slave battery pack 120 quickly, the connection state of the charging power supply and the master battery pack 110 may be switched to the disconnection state, the connection state of the charging power supply and the slave battery pack 120 may be switched to the disconnection state, the charging power supply charges only the slave battery pack 120, the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are made to be within the parallel operation voltage range more quickly, and the control device 140 controls the switching device 150 to perform parallel operation on the master battery pack 110 and the slave battery pack 120. On the basis of not switching the running state of the master battery pack 110, the parallel operation of the master battery pack 110 and the slave battery pack 120 is realized.
As an example, the control device 140 is further configured to adjust charging efficiencies of the master battery pack 110 and the slave battery pack 120 if it is determined that both the master battery pack 110 and the slave battery pack 120 are in the charging state based on the detection information and the voltage of the master battery pack 110 is greater than the voltage of the slave battery pack 120, and send a parallel operation command to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120.
It should be understood that the control device 140 is also used to adjust the charging efficiency of the master battery pack 110 and the slave battery pack 120, so that the charging power supply preferentially charges the slave battery pack 120. Specifically, the control device 140 adjusts the charging efficiency of the master battery pack 110 and the slave battery pack 120 so that the charging power supply performs fast charging on the slave battery pack 120 and slow charging on the master battery pack 110.
As an example, the sending the parallel operation command to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 includes:
when the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are both within the parallel operation voltage range, the control device 140 sends a parallel operation command to the switching device 150.
When the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are both within the parallel operation voltage range, the control device 140 sends a parallel operation command to the switching device 150, and controls the switching device 150 to perform parallel operation on the master battery pack 110 and the slave battery pack 120. After the master battery pack 110 and the slave battery pack 120 are combined, the charging power source charges the master battery pack 110 and the slave battery pack 120 together. On the basis of not switching the running state of the master battery pack 110, the parallel operation of the master battery pack 110 and the slave battery pack 120 is realized.
Referring to fig. 2, fig. 2 is a schematic structural diagram illustrating a second energy storage parallel operation device according to an embodiment of the present disclosure.
As an example, the energy storage parallel machine device 100 further includes: an ac-dc converter 160 and a power interface 170;
one end of the ac-dc converter 160 is connected to the main battery pack 110, and the other end of the ac-dc converter 160 is connected to the power interface 170;
the ac-dc converter 160 is used for converting ac power of the power interface 170 into dc power.
The power interface 170 may be connected to a load and supply power to the load through the master battery pack 110 and the slave battery pack 120. The power interface 170 may also be connected to a charging power source such as an ac power grid, so as to charge the master battery pack 110 and the slave battery pack 120 through the charging power source. Since the AC device and the DC device cannot be directly connected, an Alternating Current/Direct Current (AC/DC) converter is used to convert AC power into DC power so as to charge the main battery pack 110 and the sub battery pack 120 through an AC power grid.
As an example, the energy storage parallel operation apparatus 100 further includes: a maximum power point tracker 180 and a photovoltaic interface 190;
one end of the maximum power point tracker 180 is connected to the main battery pack 110, the other end of the maximum power point tracker 180 is connected to the third end of the switching device 150, the fourth end of the switching device 150 is connected to the photovoltaic interface 190, and the photovoltaic interface 190 is used for connecting to a photovoltaic device;
the maximum power point tracker 180 is used to monitor the power of the photovoltaic device in real time.
The photovoltaic interface 190 is used for connecting a Photovoltaic (PV) device, wherein the PV device may be a photovoltaic generator or other devices having photovoltaic cells, and is not limited herein. The master battery pack 110 and the slave battery pack 120 may be connected to a photovoltaic device through a photovoltaic interface 190 to enable solar charging of the master battery pack 110 and the slave battery pack 120. A Maximum Power Point tracker 180 (MPPT) is used to monitor the Power of the photovoltaic device, and ensure that the photovoltaic device is always at the Maximum Power during the charging process.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a switching device according to an embodiment of the present disclosure.
In an alternative example, the switching device 150 includes a first switch M1, a second switch M2, and a third switch M3;
the one end of first switch M1 is connected maximum power point tracker 180, the other end of first switch M1 is connected from the battery package 120, the one end of second switch M2 is connected photovoltaic interface 190, the other end of second switch M2 is connected the node between first switch M1 and maximum power point tracker 180, the one end of third switch M3 is connected main battery package 110, the other end of third switch M3 is connected the node between first switch M1 and from battery package 120.
The switching device 150 is used to perform parallel operation on the master battery pack 110 and the slave battery pack 120. Specifically, when the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are both within the parallel operation voltage range, the control device 140 sends a parallel operation command to the switching device 150. The third switch M3 in the switching device 150 is switched to the on state, and the master battery pack 110 and the slave battery pack 120 are connected in parallel to perform parallel operation of the master battery pack 110 and the slave battery pack 120.
It should be understood that, when the parallel operation device 100 is charged by the charging power supply, the switching device 150 is further configured to switch the connection interface between the parallel operation device 100 and the charging power supply. Specifically, the charging power supply comprises an alternating current power grid and a photovoltaic device. If the energy storage parallel operation device 100 is charged through the ac power grid, the first switch M1 and the second switch M2 are switched to the off state. If the energy storage parallel operation device 100 is charged through the photovoltaic device, the first switch M1 and the second switch M2 are switched to the on state, and the photovoltaic device charges the energy storage parallel operation device 100. Meanwhile, the maximum power point tracker 180 monitors the power of the photovoltaic device, and ensures that the photovoltaic device is always at the maximum power in the charging process.
As an example, the slave battery pack 120 includes a protection sub-device 121;
the protection sub-device 121 is respectively connected to the detection device 130 and the switching device 150;
the protection sub-device 121 is used to suppress surge current.
When the energy storage parallel operation device 100 is connected to a load or a charging power source, and the energy storage parallel operation device 100 is in an on state, an inrush current generated by an inrush phenomenon may damage the master battery pack 110 and the slave battery pack 120. The protection sub-device 121 is used to suppress the inrush current and prevent the inrush current from damaging the master battery pack 110 and the slave battery pack 120. The protection sub-device 121 can be equivalently implemented by a pre-charge stream built in the battery pack 120, which is not described herein.
It should be understood that the implementation manner of the protection sub-device 121 is set according to actual requirements, and is not limited herein. For convenience of understanding, in the embodiment of the present application, the protection sub-device 121 includes an NTC (Negative Temperature Coefficient) thermistor and a Silicon Controlled Rectifier (SCR). The high resistance of the NTC thermistor in a cold starting state limits inrush surge current. Meanwhile, the resistance value of the NTC thermistor is sharply reduced after heating, the limiting effect on the current is small, and the suppression on the surge current is realized. However, the NTC thermistor has an impedance different from 0 in a thermal state, which causes power loss, thereby affecting the operating efficiency of the parallel energy storage system. Meanwhile, when the NTC thermistor is restarted in a hot state, the inrush current cannot be suppressed. Therefore, when the energy storage parallel operation system is started, the NTC thermistor is short-circuited through the silicon controlled rectifier, the working time of the NTC thermistor is shortened, the service life of the NTC thermistor is prolonged, and the NTC thermistor is suitable for the working condition that the energy storage parallel operation device 100 is frequently started and stopped.
Example 2
Referring to fig. 4, fig. 4 is a flowchart illustrating an energy storage parallel operation method according to an embodiment of the present invention. The energy storage parallel operation method in fig. 4 includes the following steps:
step S210: detection information acquired by the detection device 130 is transmitted to the control device 140, where the detection information includes a charging/discharging state of the master battery pack 110, a voltage of the master battery pack 110, and a voltage of the slave battery pack 120.
When the main battery pack 110 supplies power to the load, the detection device 130 acquires that the main battery pack 110 is in a discharge state. When the charging power source charges the main battery pack 110, the detection device 130 acquires that the main battery pack 110 is in a charging state. Meanwhile, the detection device 130 also acquires the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 in real time, and transmits the acquired charge and discharge states of the master battery pack 110, the voltage of the master battery pack 110, and the voltage of the slave battery pack 120 to the control device 140.
Step S220: if it is determined that the master battery pack 110 is in a discharge state based on the detection information and the voltage of the master battery pack 110 is greater than the voltage of the slave battery pack 120, the control device 140 sends a parallel operation command to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120;
in an actual parallel operation process, the voltage difference between the master battery pack 110 and the slave battery pack 120 will cause that the master battery pack 110 and the slave battery pack 120 cannot be parallel operated. Specifically, if the master battery pack 110 is in a discharging state and the voltage of the master battery pack 110 is less than the voltage of the slave battery pack 120, the control device 140 sends a first control command to the switching device 150. The switching device 150 adjusts the on-off states of the master battery pack 110 and the slave battery pack 120 according to the received first control instruction, the master battery pack 110 continuously supplies power to the load, and the slave battery pack 120 charges the master battery pack 110. If the master battery pack 110 is in a discharging state and the voltage of the master battery pack 110 is greater than the voltage of the slave battery pack 120, the control device 140 does not send a control command to the switching device 150, and the master battery pack 110 continuously supplies power to the load.
If the master battery pack 110 is in a charging state and the voltage of the master battery pack 110 is greater than the voltage of the slave battery pack 120, the control device 140 sends a second control command to the switching device 150. The switching device 150 adjusts the on/off state of the charging power source and the slave battery pack 120 according to the received second control instruction. The charging power supply charges the slave battery pack 120. Meanwhile, the control device 140 is also used for adjusting the charging efficiency of the master battery pack 110 and the slave battery pack 120, so that the charging power supply preferentially charges the slave battery pack 120. Specifically, the control device 140 adjusts the charging efficiency of the master battery pack 110 and the slave battery pack 120 so that the charging power supply performs fast charging on the slave battery pack 120 and slow charging on the master battery pack 110. If the main battery pack 110 is in a charging state and the voltage of the main battery pack 110 is less than the voltage of the slave battery pack 120, the control device 140 does not send a control command to the switching device 150, and the charging power supply continues to charge the main battery pack 110.
Step S230: if it is determined that the master battery pack 110 is in a discharge state based on the detection information, and the voltage of the master battery pack 110 is smaller than the voltage of the slave battery pack 120, the control device 140 sends a first control command to the switching device 150, and sends the parallel operation command to the switching device 150 according to the voltage of the master battery pack 110 and the voltage of the slave battery pack 120.
Wherein the first control instruction is used for controlling the slave battery pack 120 to charge the master battery pack 110 through the switching device 150; when the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are both within the parallel operation voltage range, the control device 140 sends a parallel operation command to the switching device 150, and controls the switching device 150 to perform parallel operation on the master battery pack 110 and the slave battery pack 120.
When the voltage of the master battery pack 110 and the voltage of the slave battery pack 120 are both within the parallel operation voltage range, the control device 140 sends a parallel operation command to the switching device 150.
Step S240: when receiving the parallel operation command, the switching device 150 performs parallel operation on the master battery pack 110 and the slave battery pack 120.
It should be understood that, in the process of parallel operation between the master battery pack 110 and the slave battery pack 120, the operation state of the master battery pack 110 does not need to be switched, so that short-time operation stop of the external device charging and discharging with the master battery pack 110 is avoided, and reliable operation of the external device is ensured.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. An energy storage parallel operation device is characterized by comprising a main battery pack, a secondary battery pack, a detection device, a control device and a switching device;
the detection device is respectively connected with the main battery pack, the slave battery pack and the control device, and the switching device is respectively connected with the main battery pack, the slave battery pack and the control device;
the main battery pack is used for supplying power to a load or charging through a charging power supply, and the auxiliary battery pack is used as a loading pack of the main battery pack;
the detection device is used for sending acquired detection information to the control device, wherein the detection information comprises the charging and discharging state of the main battery pack, the voltage of the main battery pack and the voltage of the auxiliary battery pack;
the control device is used for sending a parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack if the main battery pack is determined to be in a discharging state based on the detection information and the voltage of the main battery pack is greater than the voltage of the slave battery pack;
the control device is further configured to send a first control instruction to the switching device if it is determined that the main battery pack is in a discharging state based on the detection information and the voltage of the main battery pack is smaller than the voltage of the slave battery pack, and send the parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack, where the first control instruction is used for controlling the slave battery pack to charge the main battery pack through the switching device;
and the switching device is used for performing parallel operation on the main battery pack and the auxiliary battery pack when the parallel operation instruction is received.
2. The energy storage parallel operation device according to claim 1, wherein the control device is further configured to send a parallel operation command to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack if it is determined that the main battery pack is in the charging state based on the detection information and the voltage of the main battery pack is lower than the voltage of the slave battery pack.
3. The energy storage parallel operation device according to claim 1, wherein the control device is further configured to send a second control instruction to the switching device if it is determined that the main battery pack is in the charging state based on the detection information, the slave battery pack is not in the charging state, and the voltage of the main battery pack is greater than the voltage of the slave battery pack, and send a parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack, wherein the second control instruction is used for adjusting the on-off states of the charging power supply and the slave battery pack through the switching device, and adjusting the on-off states of the charging power supply and the main battery pack.
4. The energy storage parallel operation device according to claim 1, wherein the control device is further configured to adjust charging efficiencies of the main battery pack and the slave battery pack if it is determined that the main battery pack and the slave battery pack are both in a charging state based on the detection information and the voltage of the main battery pack is greater than the voltage of the slave battery pack, and send a parallel operation command to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack.
5. The energy storage parallel operation device according to claim 1, wherein the sending the parallel operation command to the switching device according to the voltage of the master battery pack and the voltage of the slave battery pack comprises:
when the voltage of the main battery pack and the voltage of the auxiliary battery pack are both in a parallel operation voltage range, the control device sends a parallel operation instruction to the switching device.
6. The energy storage parallel operation device according to claim 1, further comprising: an AC-DC converter and a power interface;
one end of the alternating current-direct current converter is connected with the main battery pack, and the other end of the alternating current-direct current converter is connected with the power supply interface;
the alternating current-direct current converter is used for converting alternating current of the power supply interface into direct current.
7. The energy storage parallel operation device according to claim 1, further comprising: a maximum power point tracker and a photovoltaic interface;
one end of the maximum power point tracker is connected with the main battery pack, the other end of the maximum power point tracker is connected with a third end of the switching device, a fourth end of the switching device is connected with the photovoltaic interface, and the photovoltaic interface is used for being connected with photovoltaic equipment;
the maximum power point tracker is used for monitoring the power of the photovoltaic equipment in real time.
8. The energy storage parallel operation device according to claim 7, wherein the switching means comprises a first switch, a second switch and a third switch;
the one end of first switch is connected maximum power point tracker, the other end of first switch is connected from the battery package, the one end of second switch is connected photovoltaic interface, the other end of second switch is connected first switch with node between the maximum power point tracker, the one end of third switch is connected main battery package, the other end of third switch is connected first switch with node between the battery package from.
9. The energy storage parallel machine device according to claim 1, wherein the slave battery pack comprises a protection sub-device;
the protection sub-device is respectively connected with the detection device and the switching device;
the protection sub-device is used for restraining surge current.
10. An energy storage parallel operation method is applied to the energy storage parallel operation device according to any one of claims 1-9, and comprises the following steps:
sending detection information acquired by a detection device to a control device, wherein the detection information comprises the charging and discharging state of a main battery pack, the voltage of the main battery pack and the voltage of a slave battery pack;
if the main battery pack is determined to be in a discharging state based on the detection information, and the voltage of the main battery pack is larger than that of the slave battery pack, the control device sends a parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack;
if the main battery pack is determined to be in a discharging state based on the detection information, and the voltage of the main battery pack is smaller than that of the slave battery pack, the control device sends a first control instruction to the switching device, and sends the parallel operation instruction to the switching device according to the voltage of the main battery pack and the voltage of the slave battery pack, wherein the first control instruction is used for controlling the slave battery pack to charge the main battery pack through the switching device;
and when the switching device receives the parallel operation instruction, the main battery pack and the auxiliary battery pack are parallel operated.
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Denomination of invention: Energy storage parallel equipment and energy storage parallel method Effective date of registration: 20231103 Granted publication date: 20230324 Pledgee: Industrial and Commercial Bank of China Limited Guangzhou Dade Road Branch Pledgor: GUANGZHOU RIMSEA TECHNOLOGY Co.,Ltd. Registration number: Y2023980064018 |