CN113852158A - Energy storage device of comprehensive energy supply station - Google Patents
Energy storage device of comprehensive energy supply station Download PDFInfo
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- CN113852158A CN113852158A CN202111085608.5A CN202111085608A CN113852158A CN 113852158 A CN113852158 A CN 113852158A CN 202111085608 A CN202111085608 A CN 202111085608A CN 113852158 A CN113852158 A CN 113852158A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 70
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- 238000009413 insulation Methods 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
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- 239000003990 capacitor Substances 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
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- 229910052744 lithium Inorganic materials 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00038—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors
- H02J7/00041—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors in response to measured battery parameters, e.g. voltage, current or temperature profile
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/005—Detection of state of health [SOH]
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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
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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
- H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an energy storage device of a comprehensive energy supply station, which comprises an energy storage battery and a battery management module; the energy storage battery comprises a battery stack, the battery stack is formed by connecting and assembling a plurality of battery packs, the battery packs are formed by connecting and assembling a plurality of single batteries, and each single battery comprises a plurality of battery cell units; the battery management module comprises a three-level architecture: the system comprises a single battery management layer module, a battery pack management layer module, a battery stack management layer module and a three-level framework, wherein the single battery management layer module, the battery pack management layer module and the battery stack management layer module are communicated by adopting a CAN bus; through setting up balanced control, improve the uniformity of group battery, prolonged battery life, the module has the dry junction output, but on-the-spot warning or control, and each module is isolated each other, improves the reliability, extension group battery life.
Description
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to an energy storage device of a comprehensive energy supply station.
Background
With the rapid development of electric vehicles, energy storage devices, which are one of the key technologies of electric vehicles, have been greatly developed along with the development of vehicle technologies in recent years, and research and application of energy storage devices provide new schemes and approaches for solving the power problems of electric vehicles.
The existing energy storage devices comprise a storage battery, a fuel cell, a super battery, an ultra-high speed flywheel and the like, but for any single energy storage device, the knowledge can be simply charged and discharged, and the single energy storage device cannot be well combined with a power distribution network for transmission. And the battery pack is connected in series through a plurality of battery cell pole pieces, so that the consistency is poor, the service life of the battery is shortened, and the reliability is low.
Chinese patent application No. 202010341005.6 discloses an energy storage battery box, wherein the inner side of the bottom of a lower base is provided with a support frame with a hollow inner part, the middle part of the support frame is opposite to a first air inlet hole at the bottom of the lower base, a partition board is arranged on the top of the end cover plates at the two ends of the lower base in a manner that a symmetry line is vertical to the two ends of the lower base, two sides of the top of the partition board are respectively provided with a plurality of exhaust fans, a weak current electric control component is arranged at the top of the partition board, a battery module is arranged in a battery module placing space, the periphery of the bottom of the battery module is sealed and attached on the support frame, a strong current electric control component is arranged at one end of the inner side of the bottom of the lower base, which is far away from the end cover plate with the top inclined inwards, an upper cover plate is matched with and seals and covers the front side of the lower base, the rear side and the top, and the two ends of the upper cover plate respectively exceed the two ends of the lower base, and the first air outlet holes on the two side surfaces of the upper cover plate are correspondingly communicated with the air outlets on the side surfaces of the corresponding exhaust fans. Above-mentioned prior art scheme has reached better protection and radiating effect through setting up protection casing, but to the inside framework and the combination of group battery, lacks corresponding means, leads to influencing battery life.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an energy storage device of a comprehensive energy supply station, which improves the consistency of a battery pack and prolongs the service life of a battery by setting balance control, wherein modules have dry contact output and can give an alarm or control on site, and the modules are mutually isolated, thereby improving the reliability and prolonging the service life of the battery pack; through optimal configuration, when the battery pack is connected with a power distribution network or an output device, the battery pack is selected according to the energy storage quantity and the complexity of the output device, a more appropriate energy storage access point is selected to be accessed, reasonable configuration is carried out, and the adverse effect of the battery energy storage device on the output device is reduced.
The invention provides the following technical scheme:
an energy storage device of an integrated energy supply station comprises an energy storage battery and a battery management module; the energy storage battery comprises a battery stack, the battery stack is formed by connecting and assembling a plurality of battery packs, the battery packs are formed by connecting and assembling a plurality of single batteries, and each single battery comprises a plurality of battery cell units; the battery management module comprises a three-level architecture:
the system comprises a single battery management layer module, a battery pack management layer module, a battery stack management layer module and a three-level framework, wherein the single battery management layer module, the battery pack management layer module and the battery stack management layer module are communicated by adopting a CAN bus;
the single battery management layer module adopts a bidirectional DC/DC technology of transformer isolation to monitor the voltage and the temperature of the single battery in real time and calculate the SOC and the SOH of the single battery in real time, has dry contact output, can alarm or control on site, and is isolated from each other.
Preferably, the BCMU monitors the terminal voltage, current, temperature and insulation resistance of the battery pack in real time, calculates the SOC and SOH of the whole battery pack, and has a wet contact, a dry node output and a switching value input detection port.
Preferably, the battery stack management layer module BAMS adopts a dual-core CPU and an embedded Linux system, and can display the voltage, current, SOC and SOH of each battery pack, monitor the state information of the battery packs in real time, give a control strategy, and issue a control command.
Preferably, the battery cell unit comprises a frame and at least two monomer battery cells, the monomer battery cells are provided with two battery cell pole pieces, the top of the frame is provided with a positive busbar and a negative busbar, and two sides of the frame are bonded with the two monomer battery cells through a foam face double faced adhesive tape.
Preferably, the positive electrode cell pole pieces of the two monomer cells are connected with the positive busbar, and the negative electrode cell pole pieces of the two monomer cells are connected with the negative busbar.
Preferably, the positive electrode bus bar and the negative electrode bus bar are made of aluminum nickel plating materials; the motor chip is welded with the positive bus bar and the negative bus bar through laser.
Preferably, the single battery cell is a ternary soft-package lithium battery cell, the capacity of the single battery cell is 46Ah, the weight of the single battery cell is 760g, the size of the single battery cell is 10 × 161 × 227mm, the nominal voltage is 3.7V, the lowest voltage is 2.8V, the highest voltage is 4.3V, the normal-temperature cycle life is 2000 times, the high-temperature cycle life is 800 times, the discharge point performance at-20 ℃ is 75%, and the discharge performance at 55 ℃ is 55 ℃.
Preferably, the energy storage battery module specification (PSP 10161227-8P 4S), energy storage battery module include that monomer electricity core 32 is branched, overall dimension 422 × 170 × 247mm, installation size 404 × 70mm, fixed depth 18mm, 4M 8 bolt fastenings of installation mode, high pressure output mode: leading out from the same side of two ends, and adopting a low-voltage output mode: leading out any end and adopting a natural cooling mode.
Preferably, the method for optimizing the energy storage configuration of the energy storage device of the integrated energy supply station comprises the following steps: firstly, calculating an extension structure and a 24-hour load processing curve of an accessed output module or a power distribution network; secondly, performing initial load flow calculation on an output module to be accessed to obtain corresponding numerical values of a network loss objective function with low voltage; thirdly, judging a numerical value corresponding to the objective function, determining whether the objective function needs to be accessed into the energy storage system or not, if the objective function needs to be accessed, selecting an access point of the energy storage system, if the objective function does not need to be accessed, completing energy storage power curve optimization calculation, and calculating and outputting an energy storage capacity configuration result; fourthly, after the energy storage system is accessed, load flow calculation is carried out again to obtain each fitness function value; fifthly, judging whether the calculated fitness function meets the requirements, entering a sixth step if the calculated fitness function meets the requirements, and entering a fourth step to be executed again after the parameters of the energy storage system are updated; and sixthly, finishing the optimization of the energy storage power curve, and outputting an energy storage capacity configuration result through calculation.
Compared with the prior art, the invention has the following beneficial effects:
(1) the energy storage device of the comprehensive energy supply station improves the consistency of the battery pack and prolongs the service life of the battery by setting the balance control, the modules have dry contact output and can alarm or control on site, and the modules are mutually isolated, so that the reliability is improved and the service life of the battery pack is prolonged.
(2) According to the energy storage device of the comprehensive energy supply station, through optimal configuration, when the battery pack is connected with a power distribution network or an output device, selection is carried out according to the energy storage quantity and the complexity of the output device, a more appropriate energy storage access point is selected for access, reasonable configuration is carried out, and the adverse effect of the battery energy storage device on the output device is reduced.
(3) According to the energy storage device of the comprehensive energy supply station, the single battery management layer adopts the bidirectional DC/DC technology of transformer isolation, so that the voltage and the temperature of the single battery can be monitored in real time, the SOC and the SOH of the single battery can be calculated in real time, and the systematic safety of battery management is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, 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, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the three-level architecture of the present invention.
Fig. 2 is a schematic diagram of a cell structure according to the present invention.
Fig. 3 is an exploded view of a telecommunications unit according to the present invention.
Fig. 4 is a flowchart of a method for optimizing energy storage configuration according to the present invention.
Fig. 5 is a circuit diagram of the DC/DC converter of the present invention.
In the figure: 1. a single cell; 2. a battery core pole piece; 3. a frame; 4. soaking a double-sided adhesive tape; 5. a positive electrode bus bar; 6. a negative electrode bus bar; 7. and a battery cell unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, an energy storage device of an integrated energy supply station includes an energy storage battery and a battery management module; the energy storage battery comprises a battery stack, the battery stack is formed by connecting and assembling a plurality of battery packs, the battery packs are formed by connecting and assembling a plurality of single batteries, and each single battery comprises a plurality of battery cell units 7; the battery management module comprises a three-level architecture:
the system comprises a single battery management layer module, a battery pack management layer module, a battery stack management layer module and a three-level framework, wherein the single battery management layer module, the battery pack management layer module and the battery stack management layer module are communicated by adopting a CAN bus;
the single battery management layer module adopts a bidirectional DC/DC technology of transformer isolation to monitor the voltage and the temperature of the single battery in real time and calculate the SOC and the SOH of the single battery in real time, has dry contact output, can alarm or control on site, and is isolated from each other.
The BCMU real-time monitoring battery management module monitors the battery pack terminal voltage, current, temperature and insulation resistance, calculates the SOC and SOH of the whole battery pack, and has a wet contact, a dry node output and a switching value input detection port.
The battery stack management layer module BAMS adopts a dual-core CPU and an embedded Linux system, can display the voltage, the current, the SOC and the SOH of each battery pack, monitors the state information of the battery packs in real time, gives a control strategy and issues a control command.
Example two:
as shown in fig. 2 to 3, on the basis of the first embodiment, the battery cell unit 7 includes a frame 3 and at least two monomer battery cells 1, the monomer battery cells 1 are provided with two battery cell pole pieces 2, a positive bus bar 5 and a negative bus bar 6 are provided at the top of the frame 3, and two monomer battery cells 1 are bonded to two sides of the frame 3 through a foam double-sided adhesive tape 4.
Two positive electrode cell pole pieces 2 of the monomer cell 1 are connected with a positive busbar 5, and two negative electrode cell pole pieces 2 of the monomer cell 1 are connected with a negative busbar 6.
The positive bus bar 5 and the negative bus bar 6 are made of aluminum nickel plating materials; the motor chip is laser-welded to the positive electrode bus bar 5 and the negative electrode bus bar 6.
The single battery cell 1 adopts a ternary soft package lithium battery cell, the capacity of the single battery cell 1 is 46Ah, the weight is 760g, the size is 10 × 161 × 227mm, the nominal voltage is 3.7V, the lowest voltage is 2.8V, the highest voltage is 4.3V, the normal-temperature cycle life is 2000 times, the high-temperature cycle life is 800 times, the discharge point performance at minus 20 ℃ is 75%, and the discharge performance at 55 ℃ is 55 ℃.
Energy storage battery module specification PSP10161227-8P4S, energy storage battery module include monomer electricity core 132 branch, overall dimension 422 170 247mm, mounting dimension 404 70mm, fixed degree of depth 18mm, 4M 8 bolt fastenings of mounting means, high-pressure output mode: leading out from the same side of two ends, and adopting a low-voltage output mode: leading out any end and adopting a natural cooling mode.
Example three:
as shown in fig. 4, on the basis of the first embodiment, a method for optimizing energy storage configuration of an energy storage device of an integrated energy supply station includes the following steps: firstly, calculating an extension structure and a 24-hour load processing curve of an accessed output module or a power distribution network; secondly, performing initial load flow calculation on an output module to be accessed to obtain corresponding numerical values of a network loss objective function with low voltage; thirdly, judging a numerical value corresponding to the objective function, determining whether the objective function needs to be accessed into the energy storage system or not, if the objective function needs to be accessed, selecting an access point of the energy storage system, if the objective function does not need to be accessed, completing energy storage power curve optimization calculation, and calculating and outputting an energy storage capacity configuration result; fourthly, after the energy storage system is accessed, load flow calculation is carried out again to obtain each fitness function value; fifthly, judging whether the calculated fitness function meets the requirements, entering a sixth step if the calculated fitness function meets the requirements, and entering a fourth step to be executed again after the parameters of the energy storage system are updated; and sixthly, finishing the optimization of the energy storage power curve, and outputting an energy storage capacity configuration result through calculation.
Example four
As shown in fig. 5, on the basis of the first embodiment, the single battery management layer module adopts a bidirectional DC/DC technology of transformer isolation to monitor the voltage and temperature of the single battery in real time and calculate the SOC and SOH of the single battery in real time, and the single battery management layer module has a dry contact output which can alarm or control in the field, and the modules are isolated from each other. If the power of the energy storage battery is required to be input, the DC/DC converter belongs to a voltage reduction state, and if the power of the energy storage battery is required to be output, the DC/DC converter belongs to a voltage boosting state; referring to fig. 5, by the all-blank type transistor: s1 and S2, freewheeling diodes D1 and D2 and an inductor L are matched to realize work; when S2 is in working state, S1 is disconnected, S2 and D1 form a boost chopper circuit, the DC/DC converter is in boost state, capacitor C is discharged outwards, energy is transferred to inductor L from S2 when S2 is closed, and energy is released to the storage battery from L fine D1 when S2 is disconnected. When the S1 is in a working state, the S2 is disconnected, the S1 and the D2 form a step-down chopper circuit, the DC/DC converter is in a voltage-reducing state, and the current reversely charges the capacitor C; s1 closing energy flows into the capacitor C from the energy storage battery, the inductor L stores partial energy, S1 is opened, and L energy is released to charge the capacitor.
In the above process, when the DC/DC converter is in the boost state, the voltage relationship U between the two ends of the energy storage battery satisfies U = (t)on+toff）Uc/ toff(ii) a I.e. U = UcV (1-. alpha.); the duty ratio alpha satisfies alpha = ton/（ton+toff) (ii) a When the DC/DC converter is in a step-down state, the voltage relation U between the two ends of the capacitor CcSatisfy Uc = U·ton/（ton+toff) (ii) a In the above formula, UcIs the voltage across the capacitor C, tonIs the on-time, toffThe off time.
The device obtained by the technical scheme is an energy storage device of a comprehensive energy supply station, the consistency of the battery pack is improved and the service life of the battery is prolonged by setting balance control, the modules have dry contact output and can alarm or control on site, the modules are mutually isolated, the reliability is improved, and the service life of the battery pack is prolonged. Through optimal configuration, when the battery pack is connected with a power distribution network or an output device, the battery pack is selected according to the energy storage quantity and the complexity of the output device, a more appropriate energy storage access point is selected to be accessed, reasonable configuration is carried out, and the adverse effect of the battery energy storage device on the output device is reduced. The single battery management layer can monitor the voltage and the temperature of the single battery in real time by adopting a bidirectional DC/DC technology of transformer isolation, calculate the SOC and the SOH of the single battery in real time and increase the systematic safety of battery management.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An energy storage device of an integrated energy supply station comprises an energy storage battery and a battery management module; the energy storage battery comprises a battery stack, the battery stack is formed by connecting and assembling a plurality of battery packs, the battery packs are formed by connecting and assembling a plurality of single batteries, and each single battery comprises a plurality of battery cell units; the battery management module comprises a three-level architecture:
the system comprises a single battery management layer module, a battery pack management layer module, a battery stack management layer module and a three-level framework, wherein the single battery management layer module, the battery pack management layer module and the battery stack management layer module are communicated by adopting a CAN bus;
the single battery management layer module adopts a bidirectional DC/DC technology of transformer isolation to monitor the voltage and the temperature of the single battery in real time and calculate the SOC and the SOH of the single battery in real time, has dry contact output, can alarm or control on site, and is isolated from each other.
2. The integrated energy supply station energy storage device according to claim 1, wherein said BCMU monitors battery pack terminal voltage, current, temperature and insulation resistance in real time, calculates SOC and SOH of the whole battery pack, and has wet contact, dry contact output and switching value input detection ports.
3. The energy storage device of an integrated energy supply station according to claim 1, wherein the battery stack management layer module BAMS adopts a dual-core CPU and an embedded Linux system, and can display the voltage, current, SOC and SOH of each battery pack, monitor the state information of the battery packs in real time, give a control strategy and issue a control command.
4. The energy storage device of the integrated energy supply station according to claim 1, wherein the cell unit (7) comprises a frame (3) and at least two single cells (1), the single cells (1) are provided with two cell pole pieces (2), the top of the frame (3) is provided with a positive busbar (5) and a negative busbar (6), and two sides of the frame (3) are bonded with the two single cells (1) through a foam double-sided adhesive tape (4).
5. The energy storage device of an integrated energy supply station according to claim 4, characterized in that the positive cell pole pieces (2) of the two individual cells (1) are connected to a positive busbar (5), and the negative cell pole pieces (2) of the two individual cells (1) are connected to a negative busbar (6).
6. The integrated energy supply station energy storage device of claim 5, wherein the positive busbar (5) and the negative busbar (6) are of nickel-plated aluminum; the motor chip is welded with the positive bus bar (5) and the negative bus bar (6) through laser.
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