CN110445162A - Energy storage device - Google Patents
Energy storage device Download PDFInfo
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- CN110445162A CN110445162A CN201910826461.7A CN201910826461A CN110445162A CN 110445162 A CN110445162 A CN 110445162A CN 201910826461 A CN201910826461 A CN 201910826461A CN 110445162 A CN110445162 A CN 110445162A
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- battery pack
- direct current
- battery
- energy storage
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- 238000004146 energy storage Methods 0.000 title claims abstract description 70
- 238000009825 accumulation Methods 0.000 claims abstract description 17
- 238000004891 communication Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000006837 decompression Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 abstract description 2
- 102000047918 Myelin Basic Human genes 0.000 description 23
- 230000005611 electricity Effects 0.000 description 16
- 101710110798 Mannose-binding protein C Proteins 0.000 description 13
- 101001123334 Homo sapiens Proteoglycan 3 Proteins 0.000 description 10
- 101150071172 PCS2 gene Proteins 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 101150003196 PCS1 gene Proteins 0.000 description 2
- 101100493726 Phalaenopsis sp. BIBSY212 gene Proteins 0.000 description 2
- 101100030895 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPT4 gene Proteins 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005779 cell damage Effects 0.000 description 1
- 208000037887 cell injury Diseases 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The present invention provides a kind of energy storage devices, it is related to the grid-connected technical field of battery, energy storage device includes: at least one energy storage group, at least one energy storage group parallel connection accesses in power grid, energy storage group includes: at least one battery package, direct current positive bus, direct current negative busbar, zero curve, energy accumulation current converter, direct current positive bus, direct current negative busbar, zero curve are connected with energy accumulation current converter；Each battery package includes the first battery pack and the second battery pack；The anode of first battery pack is connected with direct current positive bus, and the cathode of the first battery pack is connected with zero curve；The anode of second battery pack is connected with zero curve, and the cathode of the second battery pack is connected with direct current negative busbar；Wherein, the direct current at least one battery package is converted to alternating current by energy accumulation current converter, is incorporated into power grid.Present invention decreases the pressure of each battery pack, improve the high reliability of system operation, and ease for maintenance improves the utilization rate of system battery group.
Description
Technical field
The present invention relates to battery interconnection technology fields, more particularly, to a kind of energy storage device.
Background technique
In electric network composition, using battery as power grid energy storage group.Since the electric energy that power grid needs is relatively more, so power grid stores up
Energy group may include multiple batteries, and multiple batteries series connection are uniformly accessed into power grid, again however, working as series-connected cell wherein after series connection
In the case where one cisco unity malfunction, it may cause that battery pack pressure is big, the safety of battery pack is low, battery utilization rate is low,
The technical problems such as system operation is influenced by single battery core state, system maintenance difficulty is big.
Summary of the invention
The purpose of the present invention is to provide energy storage devices, alleviate existing in the prior art using high-tension battery energy storage mould group
Output voltage as the total DC input voitage of energy accumulation current converter, and lead in mould group that battery pack pressure is big, safety is not high, electric
The technical problems such as pond utilization rate is low, system operation is influenced by single battery core state, system maintenance difficulty is big.
A kind of energy storage device provided by the invention, the energy storage device are arranged in website, the energy storage device include: to
A few energy storage group, at least one energy storage group parallel connection access in power grid；
Each energy storage group includes: at least one battery package, and direct current positive bus, direct current negative busbar, zero curve, energy storage become
Flow device；
The direct current positive bus, the direct current negative busbar, the zero curve are connected with the energy accumulation current converter；
Each battery package includes the first battery pack and the second battery pack；
The anode of first battery pack is connected with the direct current positive bus in form easy to plug, first battery pack
Cathode be connected with the zero curve in form easy to plug；
The anode of second battery pack is connected with the zero curve in form easy to plug, the cathode of second battery pack
It is connected with the direct current negative busbar in form easy to plug；
It is mutually indepedent in working condition between first battery pack and second battery pack, it is independent of each other；
Wherein, the direct current at least one described battery package is converted to alternating current by the energy accumulation current converter, and
Enter into power grid.
Further, the energy storage device further include: the first power adapter, first power adapter respectively with institute
Direct current positive bus is stated to be connected with the zero curve；
When first power adapter and load connect, the direct current measurement in first battery pack is converted
It is used for the load；
When first power adapter is connect with generating equipment, the generating equipment is converted by first power supply
Device is powered to the first battery pack.
Further, the energy storage group further include: second source converter, the second source converter respectively with it is described
Direct current negative busbar phase is connected with the zero curve；
When the second source converter and load connect, the direct current measurement in second battery pack is converted
It is used for the load；
When the second source converter is connect with generating equipment, the generating equipment is converted by the second source
Device is powered to the second battery pack.
Further, first battery pack and second battery pack include being made of multiple concatenated single batteries
Battery pack, battery management system；
The battery pack is connected on the battery management system；
The battery management system is to protect battery pack.
Further, the battery management system is also to the job information for detecting battery pack, detect battery pack with
When working under standing operating condition, work into extremely low power dissipation mode.
Further, first battery pack and second battery pack also include: bi-directional DC-DC isolating converter；
In first battery pack, bi-directional DC-DC isolating converter is arranged in battery management system and direct current positive bus
And between zero curve；
In second battery pack, bi-directional DC-DC isolating converter is arranged in battery management system and direct current negative busbar
And between zero curve；
The bi-directional DC-DC isolating converter is boosting the battery voltage of low numerical value for the direct current positive bus electricity
The absolute value of the absolute value of pressure or the direct current negative busbar voltage；
Performance number of the bi-directional DC-DC isolating converter to adjust the battery pack output；
The bi-directional DC-DC isolating converter is to by the absolute value of the direct current positive bus voltage of high numerical value or described
The absolute value decompression of direct current negative busbar voltage is the battery voltage of low numerical value；
The bi-directional DC-DC isolating converter is also to adjust performance number required for the battery pack charges；
The bi-directional DC-DC isolating converter is also to the protection to battery pack charge or discharge process.
Further, the energy storage device further include: cloud server, the cloud server is respectively and in battery pack
Battery management system is connected with bi-directional DC-DC isolating converter；
The job information for the battery pack that battery management system in each battery pack will test uploads to
The cloud server；
The job information of bi-directional DC-DC isolating converter in each battery pack uploads to the cloud server；
The work of job information and bi-directional DC-DC isolating converter of the cloud server to handle the battery pack
Information, and shown, so that the user of cloud side is capable of the job information of real-time monitoring battery pack and bi-directional DC-DC isolation turns
The job information of parallel operation.
Further, the cloud server by communication module respectively in the battery pack battery management system and
Bi-directional DC-DC isolating converter is communicated.
Further, the cloud server includes processor and display；
The processor is to handle the job information of the battery pack and the work letter of bi-directional DC-DC isolating converter
Breath, and it is sent to the display；
The display is to show the job information of the battery pack and the work letter of bi-directional DC-DC isolating converter
Breath, so that the user of cloud side is capable of the working condition of real-time monitoring battery pack and the work letter of bi-directional DC-DC isolating converter
Breath.
Energy storage device provided by the invention, energy storage device are arranged in website, and energy storage device includes: at least one energy storage
Group, at least one energy storage group parallel connection access in power grid, and each energy storage group includes: at least one battery package, direct current positive bus,
Direct current negative busbar, zero curve, energy accumulation current converter, direct current positive bus, direct current negative busbar, zero curve are connected with energy accumulation current converter；Each
Battery package includes the first battery pack and the second battery pack；The anode of first battery pack is connected with direct current positive bus, the first battery
The cathode of packet is connected with zero curve；The anode of second battery pack is connected with zero curve, cathode and the direct current negative busbar phase of the second battery pack
Even；Wherein, the direct current at least one battery package is converted to alternating current by energy accumulation current converter, is incorporated into power grid, this
The voltage of two battery packs of sample, which is added, provides the total voltage of PCS DC side.Operation between all battery packs is mutually indepedent, will not
There is a situation where influencing whole system due to exception occurs in certain economize on electricity core of some battery pack, compared to using through excessive battery core string
In the case that high-tension battery mould group that is in parallel and being formed provides the total voltage of PCS DC side, the pressure of each battery pack is reduced,
The high reliability of system operation is improved, ease for maintenance improves the utilization rate of system battery group.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structure chart of energy storage device provided in an embodiment of the present invention；
Fig. 2 is the structure chart of battery pack provided in an embodiment of the present invention；
Fig. 3 is the structure chart of a kind of cloud server provided in an embodiment of the present invention and battery pack communication.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
Applying example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Currently, in the prior art, the voltage that PCS DC side total voltage is single module output is provided, so as to cause group
The voltage for needing to carry at the battery pack of mould group is bigger, causes mould group pressure big, simultaneously as the battery pack of high-pressure work,
Probably because high-voltage problem, leads to cell damage, to reduce the safety of battery pack.
Based on this, energy storage device provided by the invention, energy storage device is arranged in website, and energy storage device includes: at least one
A energy storage group, at least one energy storage group parallel connection access in power grid, and each energy storage device includes at least one battery package, and direct current is just
Bus, direct current negative busbar, zero curve, energy accumulation current converter, direct current positive bus, direct current negative busbar, zero curve are connected with energy accumulation current converter；
Each battery package includes the first battery pack and the second battery pack；The anode of first battery pack is connected with direct current positive bus, and first
The cathode of battery pack is connected with zero curve；The anode of second battery pack is connected with zero curve, the negative mother of the cathode and direct current of the second battery pack
Line is connected；Direct current at least one battery package is converted to alternating current by energy accumulation current converter, is incorporated into power grid, in this way
The voltage of two battery packs, which is added, provides the total voltage of PCS DC side.Operation between all battery packs is mutually indepedent, Bu Huifa
Raw the case where influencing whole system due to certain economize on electricity core of some battery pack occurs abnormal, compared to using through excessive battery core string simultaneously
Join in the case where the total voltage of the high-tension battery mould group offer PCS DC side of formation, reduces the pressure of each battery pack, mention
The high reliability of system operation is risen, ease for maintenance improves the utilization rate of system battery group.
It describes in detail in conjunction with attached drawing:
As shown in connection with fig. 1, a kind of energy storage device provided by the invention, energy storage device are arranged in website, energy storage device packet
Include: at least one energy storage group, at least one energy storage group parallel connection access in power grid, and each energy storage group includes: at least one battery
Package, direct current positive bus, direct current negative busbar, zero curve, energy accumulation current converter (PCS, Power Conversion System)；
Direct current positive bus, direct current negative busbar, zero curve are both connected on energy accumulation current converter；
Each battery package includes the first battery pack and the second battery pack；
The anode of first battery pack is connected with direct current positive bus in form easy to plug, the cathode and zero curve of the first battery pack
It is connected in form easy to plug；Wherein, MBP1+, MBP2+ ..., MBPn+ be the first battery pack.
The anode of second battery pack is connected with zero curve in form easy to plug, the cathode and direct current negative busbar of the second battery pack
It is connected in form easy to plug；MBP1-, MBP2- ..., MBPn- be the second battery pack.
At least one first battery pack is connected in parallel between direct current positive bus and zero curve in this way, at least one second battery pack
It is connected in parallel between direct current negative busbar and zero curve.
Wherein, the direct current at least one battery package is converted to alternating current by energy accumulation current converter, is incorporated into power grid
In.
As shown in connection with fig. 1, the structure chart of energy storage device is shown, which includes: at least one energy storage group, to scheme
Shown in 1, by taking two energy storage groups as an example, wherein may include 1~n the first battery packs and the second battery pack, 1~n first electricity
Chi Bao be expressed as MBP1+, MBP2+ ..., MBPn+, MBP1+, MBP2+ ..., MBPn+ it is in parallel, anode connection
Direct current positive bus HV1+, cathode connect zero curve 0, and direct current positive bus HV1+, cathode connect zero curve 0, the HV1- connection of direct current negative busbar
In PCS1.1~n the second battery packs be expressed as MBP1-, MBP2- ..., MBPn-, MBP1-, MBP2- ...,
MBPn- is in parallel, and equal cathode connects direct current negative busbar HV-, anode connection zero curve 0, and direct current negative busbar HV1- is connected in PCS1.
Zero curve 0, direct current negative busbar HV2- connection PCS2 are connected using direct current positive bus HV2+, cathode, the battery pack connecting with PCS2 can
Be expressed as MBP1-, MBP2- ..., MBPm-, MBP1+, MBP2+ ..., MBPm+, MBP1+, MBP2+ ...,
MBPm+ is connected between direct current positive bus HV2+ and zero curve 0, MBP1-, MBP2- ..., MBPm- be connected to direct current negative busbar
Between HV2- and zero curve 0, and so on, PCS1 and PCS2 are both connected on power grid, its connected battery pack can be incorporated to electricity
In net.
Wherein, between the voltage being applied between direct current positive bus HV1+, zero curve 0, with direct current negative busbar HV1- and zero curve
Voltage must be identical.For example, when the total voltage of PCS DC side is 800V, MBP1+, MBP2+ ..., the electricity in MBPn+
Pressure is 400V, MBP1-, MBP2- ..., the voltage in MBPn- be 400V, that is, each pair of battery package MBP1+ and MBP1- string
Join the voltage 800V mutually added up；Certainly, when the total voltage of PCS DC side is 820V, MBP1+, MBP2+ ...,
Voltage in MBPn+ can be 410V, MBP1-, MBP2- ..., the voltage in MBPn- can be 410V, that is, Mei Dui electricity
The voltage 820V that pond package MBP1+ and MBP1- added in series gets up.
MBP1+ in energy storage group each in this way and MBP1- forms battery package, is together in series, and two voltages are added can be with
Obtain the total voltage of PCS output grid side.Due to connecting the case where forming battery package using two battery packs, two can be used
The voltage of a battery pack, which is added, provides the PCS total voltage of output grid side, provides PCS output electricity compared to using a battery pack
In the case where the total voltage of net side, the pressure of each battery pack is reduced, simultaneously as the electricity of each battery pack output subtracts
Small, i.e., power reduces, then the number of single battery in battery pack is reduced, so that battery pack more has safety.
Wherein, in conjunction with shown in Fig. 1 and Fig. 2, the energy storage group further include: the first power adapter 120, first power supply
Converter 120 is connected with the direct current positive bus and the zero curve respectively；
When first power adapter and load connect, the direct current measurement in first battery pack is converted
It is used for the load；
When first power adapter is connect with generating equipment, the generating equipment is converted by first power supply
Device is powered to the first battery pack.
As an example, as shown in connection with fig. 1, which can be AC-DC converter, hand over
The anode of stream-direct current transducer DC side is connect with direct current positive bus HV1+, the cathode of the DC side of AC-DC converter
It is connected with zero curve 0；The exchange side of AC-DC converter is connect with AC load, by the direct current measurement in the first battery pack by
Direct current uses after becoming exchange for AC load；Meanwhile the exchange side of AC-DC converter is connect with AC power generating apparatus, is handed over
Flowing generating equipment can be powered by AC-DC converter to the first battery pack of DC side.
As another example, which can be DC-to-dc converter, DC-DC conversion
The anode of device is connect with direct current positive bus HV1+, and the cathode of DC-to-dc converter is connected with zero curve 0；DC-to-dc converter
It is connect with DC load, the direct current measurement in the first battery pack is used for AC load；Meanwhile DC-to-dc converter
Exchange side is connect with DC generation equipment, and DC generation equipment can be powered by DC-to-dc converter to the first battery pack.
Wherein, load or generating equipment can be the equipment in microgrid, such as: load can be PV, charging pile, power generation
Equipment can be distributed photovoltaic.First power adapter will be connected between direct current positive bus HV+ and zero curve 0, with MBP1+,
MBP2+ ..., MBPn+ it is in parallel, such first power adapter, can be in the case where connection load or generating equipment
By MBP1+ or MBP2+ ... or the voltage in MBPn+ by DC communication convert carry out battery charging and discharging.For example,
When load is charging pile, then it can be directly connected to the first power adapter 120 and become to exchange by direct current, be Vehicular charging.
Certainly, due between the connection between direct current positive bus HV1+ and zero curve 0, with direct current negative busbar HV1- and zero curve 0
Connection, the effect for providing voltage is identical, so, in the energy storage group include second source converter 130, second source conversion
One end of device 130 is connect with direct current negative busbar HV1-, and the other end of second source converter 130 is connected with zero curve 0；Certainly,
Two power adapters 130 also can connect between direct current negative busbar HV2- and zero curve 0.
When second source converter 130 and load connect, the direct current measurement in the second battery pack is subjected to transformation for negative
It carries and uses；As shown in connection with fig. 1, when being connected on direct current negative busbar HV1- and zero curve 0, the second battery pack can be used, i.e.,
MBP1- or MBP2- ... or the voltage against load in MBPn- is powered.
When second source converter 130 is connect with generating equipment, generating equipment gives second by second source converter
Battery pack power supply.As shown in connection with fig. 1, generating equipment by second source converter 130 to MBP1- or MBP2- ... or
MBPn- power supply.
As an example, as shown in connection with fig. 1, which can be AC-DC converter, hand over
The anode of stream-direct current transducer DC side is connect with zero curve, the negative mother of the cathode and direct current of the DC side of AC-DC converter
Line HV1- is connected；The exchange side of AC-DC converter is connect with AC load, by the direct current measurement in the second battery pack by straight
It is used after rheology exchange for AC load；Meanwhile the exchange side of AC-DC converter is connect with AC power generating apparatus, exchange
Generating equipment can be powered by AC-DC converter to the second battery pack of DC side.
As another example, which can be DC-to-dc converter, DC-DC conversion
The anode of device is connect with zero curve 0, and the cathode of DC-to-dc converter is connected with direct current negative busbar HV1-；DC-to-dc converter
It is connect with DC load, the direct current measurement in the second battery pack is used for AC load；Meanwhile DC-to-dc converter
Exchange side is connect with DC generation equipment, and DC generation equipment can be powered by DC-to-dc converter to the second battery pack.
Wherein, the function of the first power adapter and second source converter, effect can be all the same, just to distinguish
Two are connected on direct current positive bus HV1+ and direct current negative busbar HV1-, in order to distinguish the difference of connection relationship, thus
Name the first power adapter and second source converter.
Certainly, it for the first power adapter 120 for specifically using direct current positive bus HV1+ and zero curve 0 to connect, still adopts
The second source converter 130 connected with direct current negative busbar HV1- and zero curve 0, can be by detecting MBP1+, MBP2
+ ..., MBPn+, MBP1-, MBP2- ..., the voltage of each battery pack determines in MBPn-, i.e., ought detect battery
When remaining capacity in packet is more, can use that side power adapter, by the power adapter by remaining capacity compared with
Electricity in more battery packs is used for load.
As shown in connection with fig. 2, the first battery pack and the second battery pack include the electricity being made of multiple concatenated single batteries
Pond group, battery management system (BMS, BATTERY MANAGEMENT SYSTEM)；Battery pack is connected to battery management system 110
On；As shown in connection with fig. 2, the upper side line of battery pack and lower side line are connected to battery management system 110, can be by upper side line under
The side line leakage of electricity flows to battery management system 110, the line between upper side line and lower side line, can be gathering line, i.e. battery management
The case where system 110 acquires multiple single batteries, comprising: voltage.
For the single battery in battery pack, different chemical systems can have, for example, lithium ion, sodium ion, plumbic acid
Etc..It can have different lifetime stages, for example, completely new, successive etc., can also have different encapsulation modes.
Wherein, battery management system BMS is also used to protect battery pack, prevents battery from occurring overcharging and the problem of over-discharge.By
In on the voltage acquisition line that the single battery in battery pack is connected in parallel on battery management system BMS, so, battery management system
BMS can detecte the charge status of single battery, then after being more than safe voltage detecting some single battery, control
Battery pack where making the single battery stops electric discharge or charging.
In some embodiments, battery management system is detecting battery pack also to the job information for detecting battery pack
When being worked under operating condition with standing, work into extremely low power dissipation mode.Wherein, stand operating condition are as follows: energy storage device do not charge and
In the case where not discharging.Extremely low power dissipation mode is that battery management system enters suspend mode, so that battery management system
Power consumption of uniting is very low.
For the output voltage of balancing battery packet, first battery pack and second battery pack are also included: two-way
DC-DC isolating converter；
In first battery pack, bi-directional DC-DC isolating converter is arranged in battery management system and direct current positive bus
Between HV+ and zero curve 0；
In second battery pack, bi-directional DC-DC isolating converter is arranged in battery management system and direct current negative busbar
Between HV- and zero curve 0；
Bi-directional DC-DC isolating converter is can increased or decrease the voltage that battery pack exports, with regulating cell packet
The voltage value of output.
Bi-directional DC-DC isolating converter is boosting the battery voltage of low numerical value for the absolute of direct current positive bus voltage
The absolute value of value or direct current negative busbar voltage；
The performance number that bi-directional DC-DC isolating converter is exported to regulating cell packet；
Bi-directional DC-DC isolating converter is to electric by the absolute value of the direct current positive bus voltage of high numerical value or direct current negative busbar
The absolute value decompression of pressure is the battery voltage of low numerical value；
Performance number required for bi-directional DC-DC isolating converter also charges to regulating cell packet；
Bi-directional DC-DC isolating converter is also to the protection to battery pack charge or discharge process.
As shown in connection with fig. 2, the element for including in battery pack is shown, multiple batteries, a battery management system are (in Fig. 2
Be expressed as BMS), a bi-directional DC-DC isolating converter (DCDC is expressed as in Fig. 2), a bi-directional DC-DC isolating converter one
End is connected with battery management system, and when for the first battery pack, bi-directional DC-DC isolating converter is connected to direct current positive bus HV1+
And between zero curve 0.When for the second battery pack, bi-directional DC-DC isolating converter is connected to direct current negative busbar HV1- and zero
Between line 0.
As an example, the voltage that the first battery pack needs to contribute to PCS is 400V, if the series connection in the first battery pack
The 50V voltage that provides of battery pack, then need the concatenated battery in the first battery pack using bi-directional DC-DC isolating converter
The 50V voltage that group provides increases to 400V voltage, is output on DC bus HV+.Likewise, the second battery pack needs contribute to
The voltage of PCS be 400V, and the second pond packet in concatenated battery pack provide 52V voltage, then need using bi-directional DC-DC every
The 52V boost in voltage concatenated battery pack in the second battery pack provided from converter is output to direct current mother to 400V voltage
On line HV-.So the present invention can be realized by adding bi-directional DC-DC isolating converter by the first battery pack and the second battery
The boost in voltage of different series connection battery cores realizes the efficient benefit to the battery core of different voltages to the numerical value of same busbar voltage in packet
With.
As shown in connection with fig. 3, a kind of energy storage device provided by the invention, further includes: cloud server 140, cloud server
140 respectively in battery pack battery management system 110 and bi-directional DC-DC isolating converter 150 be connected；
The job information for the battery pack that battery management system 110 in each battery pack will test uploads to cloud clothes
Business device 140；Wherein, the job information of battery pack includes the remaining electricity of operating mode locating for battery pack, battery pack etc. letter
Breath.
Bi-directional DC-DC isolating converter 150 in each battery pack by the job information of bi-directional DC-DC isolating converter,
I.e. the job information of itself is uploaded to cloud server 140 by bi-directional DC-DC isolating converter 150；
Cloud server 140 is to the job information for the treatment of of battery packet and the work letter of bi-directional DC-DC isolating converter 150
Breath, and shown, so that the user of cloud side is capable of job information and the bi-directional DC-DC isolation conversion of real-time monitoring battery pack
The job information of device 150.
Certainly, on the managing electric quantity to battery pack, multiple battery management systems can be by the corresponding battery pack detected
Electricity upload in cloud server 140, cloud server 140 can analyze battery pack on direct current positive bus HV1+ and straight
The remaining capacity of the battery pack on negative busbar HV1- and the power demand according to load are flowed, control instruction is generated, passes through two-way DC-
DC isolating converter 150 controls the size of each battery pack output power, uses for load supplying.
It as an example, can be according to remaining how many and load the power demands of the battery capacity in battery package, control
The output power of the first battery pack and the second battery pack is made, such as when the available maximum instantaneous output power of each battery pack is
When 2kW, the first battery pack remaining capacity is 5 degree of electricity, and the second battery pack remaining capacity is 3 degree of electricity, and the power demand of load is
3kW, then cloud server 140 can control the power of the first battery pack output 2kW, and the second battery pack exports the power of 1kW；This
It invents and is not particularly limited, concrete restriction is for example, cloud server 140 can control the first battery pack and the second battery pack mentions
For impartial voltage and equalization output power or cloud server 140 can control the first battery pack and the second battery pack mentions
For impartial voltage and unequal output power.
It can be with for the practical operation situation of at least one energy storage group are as follows: when being incorporated into the power networks, as shown in figures 1 and 3
All work is in DC bus constant voltage mode, off-grid operation by PCS in energy storage device, 1 in system as shown in figures 1 and 3
Platform PCS operates in AC constant voltage mode, remaining PCS operates in DC constant voltage mode.Energy storage group as shown in figures 1 and 3, In
And when off-network switching, some battery pack serves as DC voltage source in energy storage group, and place PCS serves as alternating-current voltage source, remaining PCS
Current source is operated to, work is generated in the battery pack of DC constant voltage mode using preemption mechanism or token or designated mode.
Wherein, cloud server 140 by communication module 160 respectively with the two-way DC- of battery management system in battery pack
DC isolating converter is communicated.For example, local area network, mobile communications network, 4G/5G etc..As shown in connection with fig. 3, battery pack 1~
Battery management system 110 and bi-directional DC-DC isolating converter 150 in battery pack n pass through communication module 160 and cloud service
Device 140 is connected.
Wherein, communication module includes but is not limited to that wireless communication module, wire communication module, optical communication module etc. carry out
The mode of information transmission.
Wherein, cloud server 140 includes processor and display；
Processor is sent to the job information for the treatment of of battery packet and the job information of bi-directional DC-DC isolating converter
To display；
Display is to show the job information of battery pack and the job information of bi-directional DC-DC isolating converter, so that cloud
The user of end side is capable of the working condition of real-time monitoring battery pack and the job information of bi-directional DC-DC isolating converter.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (9)
1. a kind of energy storage device, which is characterized in that the energy storage device is arranged in website, and the energy storage device includes: at least
One energy storage group, at least one energy storage group parallel connection access in power grid；
Each energy storage group includes: at least one battery package, direct current positive bus, direct current negative busbar, zero curve, energy storage unsteady flow
Device；
The direct current positive bus, the direct current negative busbar, the zero curve are connected with the energy accumulation current converter；
Each battery package includes the first battery pack and the second battery pack；
The anode of first battery pack is connected with the direct current positive bus in form easy to plug, and first battery pack is born
Pole is connected with the zero curve in form easy to plug；
The anode of second battery pack is connected with the zero curve in form easy to plug, the cathode of second battery pack and institute
Direct current negative busbar is stated to be connected in form easy to plug；
It is mutually indepedent in working condition between first battery pack and second battery pack；
Wherein, the direct current at least one described battery package is converted to alternating current by the energy accumulation current converter, is incorporated into
In power grid.
2. energy storage device according to claim 1, which is characterized in that the energy storage device further include: the conversion of the first power supply
Device, first power adapter are connected with the direct current positive bus and the zero curve respectively；
When first power adapter and load connect, the direct current measurement in first battery pack is converted for institute
Load is stated to use；
When first power adapter is connect with generating equipment, the generating equipment is given by first power adapter
The power supply of first battery pack.
3. energy storage device according to claim 1, which is characterized in that the energy storage group further include: second source converter,
The second source converter is connected with the direct current negative busbar phase and the zero curve respectively；
When the second source converter and load connect, the direct current measurement in second battery pack is converted for institute
Load is stated to use；
When the second source converter is connect with generating equipment, the generating equipment is given by the second source converter
The power supply of second battery pack.
4. energy storage device according to claim 3, which is characterized in that first battery pack and second battery pack are equal
Including be made of multiple concatenated single batteries battery pack, battery management system；
The battery pack is connected on the battery management system；
The battery management system is to protect battery pack.
5. energy storage device according to claim 4, which is characterized in that the battery management system is also to detect battery pack
Job information work when detecting battery pack and being worked under operating condition with standing into extremely low power dissipation mode.
6. energy storage device according to claim 4, which is characterized in that first battery pack and second battery pack are also
It include: bi-directional DC-DC isolating converter；
In first battery pack, the setting of bi-directional DC-DC isolating converter in battery management system and direct current positive bus and
Between zero curve；
In second battery pack, the setting of bi-directional DC-DC isolating converter in battery management system and direct current negative busbar and
Between zero curve；
The bi-directional DC-DC isolating converter is boosting the battery voltage of low numerical value for the direct current positive bus voltage
The absolute value of absolute value or the direct current negative busbar voltage；
Performance number of the bi-directional DC-DC isolating converter to adjust the battery pack output；
The bi-directional DC-DC isolating converter is to by the absolute value or the direct current of the direct current positive bus voltage of high numerical value
The absolute value decompression of negative busbar voltage is the battery voltage of low numerical value；
The bi-directional DC-DC isolating converter is also to adjust performance number required for the battery pack charges；
The bi-directional DC-DC isolating converter is also to the protection to battery pack charge or discharge process.
7. energy storage device according to claim 3, which is characterized in that the energy storage device further include: cloud server, institute
State cloud server respectively in battery pack battery management system and bi-directional DC-DC isolating converter be connected；
The job information for the battery pack that battery management system in each battery pack will test uploads to described
Cloud server；
Bi-directional DC-DC isolating converter in each battery pack uploads the job information of bi-directional DC-DC isolating converter
To the cloud server；
The cloud server is to handle the job information of the battery pack and the work letter of bi-directional DC-DC isolating converter
Breath, and shown, so that the user of cloud side is capable of job information and the bi-directional DC-DC isolation conversion of real-time monitoring battery pack
The job information of device.
8. energy storage device according to claim 7, which is characterized in that the cloud server by communication module respectively with
Battery management system and bi-directional DC-DC isolating converter in the battery pack are communicated.
9. energy storage device according to claim 7, which is characterized in that the cloud server includes processor, Yi Jixian
Show device；
The processor to handle the job information of the battery pack and the job information of bi-directional DC-DC isolating converter, and
It is sent to the display；
The display to show the job information of the battery pack and the job information of bi-directional DC-DC isolating converter, with
Enable the working condition of user's real-time monitoring battery pack of cloud side and the job information of bi-directional DC-DC isolating converter.
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