CN102231544A - External battery pack type electricity-supplement balancing system and method of energy storage system - Google Patents
External battery pack type electricity-supplement balancing system and method of energy storage system Download PDFInfo
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- CN102231544A CN102231544A CN2011101776444A CN201110177644A CN102231544A CN 102231544 A CN102231544 A CN 102231544A CN 2011101776444 A CN2011101776444 A CN 2011101776444A CN 201110177644 A CN201110177644 A CN 201110177644A CN 102231544 A CN102231544 A CN 102231544A
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Abstract
The invention discloses an external battery pack type electricity-supplement balancing system and method of an energy storage system. The balancing system comprises a generating device, an electrical energy combining system, a direct-current busbar, a first charging module, a first storage battery pack, a second charging module, a second storage battery pack, a DC/DC converter, a relay and a balancing bus. The generating device is connected to the electrical energy combining system, and the electrical energy combining system is connected with the direct-current busbar; the first charging module and the second charging module are connected to the direct-current busbar, the first charging module is connected to the first storage battery pack, the second charging module is connected to the second storage battery pack, the first storage battery pack is connected with the DC/DC converter and the relay in sequence, the relay is connected to the second storage battery pack via the balancing bus, and the first storage battery pack is used for balancing the electricity supplement of the second storage battery pack via the balancing bus. The external battery pack type electricity-supplement balancing system and method of the energy storage system are capable of realizing effective dynamic balance and increasing the charging-discharging efficiency.
Description
Technical field
The present invention relates to the generation of electricity by new energy field, in particular a kind of external connection battery group formula of energy-storage system is mended electrical equalization system and equalization methods.
Background technology
Grid-connected power generation system such as wind energy, solar energy, wave energy all have characteristics such as fluctuation, instability.Adopt extensive energy storage technology, can make the power output of unsettled new forms of energy electric power smoothly adjustable, unsettled electric energy input is become continuous, safe and reliable electric energy output, improve electric network security and reliability, improve the utilization rate of new forms of energy electric power, reduce of the impact of fluctuation electric energy, a difficult problem thereby solution new forms of energy electric power is incorporated into the power networks to electrical network.From the net generation of electricity by new energy, is because the unsteadiness of electric power needs extensive energy-storage system to realize that electric power smoothly reach storage for the independence of island, remote districts etc. simultaneously, to satisfy the regular supply that does not have electric power under the situation that new forms of energy exert oneself.
The important external factor that influences battery cell, energy-storage battery system is a temperature; Internal factor is in the internal resistance of battery and the module, the consistency of intermodule battery.Extensive energy storage need be got up a plurality of cell connection in series-parallel to obtain the output of bigger stored energy capacitance and higher-wattage, and the energy storage size of battery pack depends on the charge-discharge characteristic that differs from a batteries most.Because the battery manufacture process itself has certain discreteness, and along with the battery growth of service time, the mutual difference of battery performance is more outstanding, if battery is not carried out balanced management, along with charge and discharge cycles is carried out, inconsistent meeting between cell causes and owes charging, overcharges and overdischarge, has a strong impact on the serviceability and the life-span of battery pack, and can cause serious potential safety hazard.
Existing balancing technique is often only used resistance battery pack is carried out the dissipative type equilibrium in charging process.This balanced way can not carry out dynamic equalization at charge and discharge process, and portfolio effect is remarkable inadequately.And dissipative type resistance can produce a large amount of heat in balancing procedure, reduced efficiency for charge-discharge, causes the huge waste of effective storage power; Produced simultaneously big calorimetric has also increased the burden of heat management.Existing non-dissipative type equalization methods mainly comprises switching capacity equalization methods etc., but tends to exist circuit complexity, balancing speed to wait problem slowly.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of external connection battery group formula of energy-storage system to mend electrical equalization system and equalization methods, be intended to solve existing dissipative type resistance balanced way and in balancing procedure, can produce a large amount of heat, reduce efficiency for charge-discharge, caused the huge waste of effective storage power; Produced simultaneously big calorimetric has also increased the burden of heat management, and circuit system complexity, balancing speed wait problem slowly.
Technical scheme of the present invention is as follows:
A kind of external connection battery group formula of energy-storage system is mended the electrical equalization system, wherein, comprise Blast Furnace Top Gas Recovery Turbine Unit (TRT), electric energy combination system, dc bus, first charging module, first batteries, second charging module, second batteries, DC/DC converter, relay, equalizing bus bar, combining inverter and line module, described Blast Furnace Top Gas Recovery Turbine Unit (TRT) is connected to the electric energy combination system, described electric energy combination system is connected to combining inverter by dc bus, and described combining inverter connects line module; Described first charging module and second charging module all are connected on the dc bus, described first charging module connects first batteries, described second charging module connects second batteries, described first batteries connects DC/DC converter and relay successively, described relay is connected to second batteries by equalizing bus bar, and described first batteries is mended electrical equalization by equalizing bus bar to second batteries.
The external connection battery group formula of described energy-storage system is mended the electrical equalization system, wherein, described second batteries comprises a plurality of cells, all cells are divided into a plurality of energy-storage modules, described energy-storage module comprises balanced power input, electric energy output end and control end, the balanced power input of each energy-storage module is connected in parallel, and the electric energy output end of each energy-storage module is connected in series, and described control end is connected to the energy storage control unit.
The external connection battery group formula of described energy-storage system is mended the electrical equalization system, wherein, each energy-storage module comprises at least two monomer bags that are connected in series, described monomer bag comprises a cell, one microprocessor and an isolation module, described monomer is wrapped and is provided with positive limit, the negative pole point, LIN bus and equalizing bus bar, the two poles of the earth of described cell respectively correspondence be connected that positive limit and negative pole point are gone up and microprocessor on, described equalizing bus bar is connected on the microprocessor, described LIN bus is connected on the microprocessor by isolation module, and described LIN bus is connected on the control end; Described equalizing bus bar is connected on the balanced power input; Described positive limit and negative pole point are connected electric energy output end.
The external connection battery group formula of described energy-storage system is mended the electrical equalization system, and wherein, described Blast Furnace Top Gas Recovery Turbine Unit (TRT) is provided with many covers, and all is connected to the electric energy combination system.
A kind of external connection battery group formula of energy-storage system is mended the electrical equalization method, wherein, described microprocessor is gathered the voltage of each cell in the energy-storage module, and send to the energy storage control unit, described energy storage control unit calculates the average voltage of the cell in each energy-storage module, the average voltage of cell in a certain monomer battery voltage in a certain energy-storage module is lower than its place energy-storage module, then the microprocessor controls cell in the monomer bag is connected with equalizing bus bar, cell absorbs the electric weight on the equalizing bus bar, begins this cell is carried out equilibrium; When this monomer battery voltage reached the average voltage of cell in the energy-storage module, cell and equalizing bus bar disconnected, and finish the equilibrium of this joint cell, and the cell to another joint low-voltage carries out equilibrium treatment then.
The external connection battery group formula of described energy-storage system is mended the electrical equalization method, wherein, if the voltage of all cells in a certain energy-storage module is all balanced, but be lower than the average voltage between each energy-storage module in the energy-storage system, then all cells of this energy-storage module are connected with equalizing bus bar, absorb the electric weight on the equalizing bus bar, and each single battery in the energy-storage module is all mended, reach the average voltage of energy-storage units module up to the voltage of this energy-storage module, finish the equilibrium of energy-storage system.
Beneficial effect of the present invention: the present invention is by providing a kind of benefit electrical equalization scheme of external batteries formula, it adopts the bus equalization mode, balanced power input all connects on the electrode of battery unit, at any time can carry out equilibrium to single battery, as long as there is monomer battery voltage low, satisfy equilibrium condition, no matter energy-storage units or module are in charging, discharge or laying state, all can be balanced immediately, realize effective dynamic equalization, in balancing procedure, can not produce a large amount of heats in addition, improve efficiency for charge-discharge.
Description of drawings
Fig. 1 is the schematic diagram of external connection battery group formula equalizing system provided by the invention;
Fig. 2 is an energy-storage units structural representation provided by the invention;
Fig. 3 is a battery module schematic diagram provided by the invention;
Fig. 4 is that monomer bag internal balance provided by the invention enables schematic diagram.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.
The invention provides a kind of external batteries formula equalizing system and equalization methods thereof of energy-storage system, the equalizing system that adopts external batteries formula to mend the electrical equalization method comprises two cover charging modules and a cover benefit electricity batteries.By increasing by a small-sized charging module of cover and as the batteries of mending electricity big energy-storage system being mended electrical equalization, principle as shown in Figure 1.
Referring to Fig. 1, described external batteries formula is mended the electrical equalization system and is comprised Blast Furnace Top Gas Recovery Turbine Unit (TRT), electric energy combination system, dc bus, first charging module, first batteries, second charging module, second batteries, DC/DC converter, relay, equalizing bus bar, combining inverter and line module.External batteries is mended the electrical equalization system and is overlapped first charging module and be used as first batteries of mending electricity by increasing by one, and first batteries is that second batteries is mended electrical equalization to big energy-storage system.
Blast Furnace Top Gas Recovery Turbine Unit (TRT) is provided with many covers among the present invention, Blast Furnace Top Gas Recovery Turbine Unit (TRT) 1, Blast Furnace Top Gas Recovery Turbine Unit (TRT) 2 ..., Blast Furnace Top Gas Recovery Turbine Unit (TRT) n (wherein n is more than or equal to 1), described Blast Furnace Top Gas Recovery Turbine Unit (TRT) all is connected to the electric energy combination system, described electric energy combination system is connected to combining inverter by dc bus, and described combining inverter connects line module; Described first charging module and second charging module all are connected on the dc bus, described first charging module connects first batteries, described second charging module connects second batteries, described first batteries connects DC/DC converter and relay successively, and described relay is connected to second batteries by equalizing bus bar.Described first batteries is balanced source.
Energy-storage system in this programme is divided into monomer bag, energy-storage module, three ranks of energy-storage units (being batteries).Each energy-storage module constitutes by the 8-10 batteries is monomer series-connected, and energy-storage units then is made of n energy-storage module cascade.
As shown in Figure 4, described monomer bag comprises positive limit, negative pole point, LIN bus.The LIN bus is used for that module controls is firm and hard existing carries out distributed control to monomer.The internal structure schematic diagram of monomer bag, each monomer bag is formed by a cell, a microprocessor (MPU) and an isolation module.Described cell is connected on the microprocessor, and described equalizing bus bar is connected on the microprocessor, and described LIN bus is connected on the microprocessor by isolation module.
Module is formed schematic diagram as shown in Figure 3, comprises constant-current source, more piece monomer bag, module controls plate.Wherein, constant-current source obtains electric energy from balanced power supply, and each constant-current source is responsible for the equilibrium of a module and is mended.The module controls plate is judged the annexation of single battery and equilibrium line by monomer voltage height in the module inner treater comparison module.Module controls plate inner treater sends equilibrium and enables, and by inputing to microprocessor MPU behind LIN bus and the isolation module, microprocessor MPU is controlled the annexation of single battery and equalizing bus bar again, connects to enter equilibrium state.In order to improve balancing speed and efficient, in this equalization scheme energy-storage system is divided into a plurality of energy-storage modules, as shown in Figure 2.Described energy-storage system comprise balanced power input, first energy-storage module, second energy-storage module ..., n energy-storage module, energy storage control unit, described first energy-storage module, second energy-storage module ..., the n energy-storage module all is connected in parallel on the balanced power input, be connected in series between the output of each energy-storage module.The effect of described energy storage control unit mainly is to establish the average voltage that processor extracts the voltage of each cell and calculates energy-storage units by interior, and provides interface for the can bus.The function that the energy storage control unit will be realized in other respects is not in this description.Described energy storage control unit connects each energy-storage module by the can bus, and at this moment, each module is done as a whole, and the positive pole of the first segment monomer of arranging in the module is as the positive pole of module, and the negative pole of final section monomer is as the negative pole of module.
The voltage of each cell in the voltage acquisition system acquisition energy-storage module in the microprocessor that embeds in the described monomer bag, and pass through the average voltage that energy-storage units controller inner treater calculates the energy-storage units cell, the computing formula of its average voltage U is: energy-storage units monomer average voltage U=energy-storage units total voltage/energy-storage units cell sum.Processor in the module calculates the average voltage of each module monomer: cell number in module monomer average voltage U '=energy-storage module voltage/module, this average voltage are to carry out measurement foundation balanced in the module.Energy-storage units average voltage and module average voltage are the foundations of intermodule equilibrium.
External connection battery group formula of the present invention is mended the electrical equalization mode two cover charging module and batteries.Electric power on the dc bus can be given the charging of two group storage batteries respectively by charging module.Wherein first charging module is given first battery charging, and first batteries is as balanced source; Second charging module is given second battery charging, mainly plays the effect of pressure regulation, energy storage.Play first batteries in balanced source and export required euqalizing current by the DC/DC converter.The DC/DC converter output terminal is connected with relay, and by the output of relay Control current, the moving contact and the fixed contact adhesive of relay begin to flow through euqalizing current when cell needs equilibrium.
The method of equilibrium provided by the invention is: when battery needed equilibrium, the moving contact of relay and fixed contact adhesive were passed through equalizing bus bar with euqalizing current.Earlier each cell in the module is carried out equilibrium, again module and intermodule are carried out equilibrium.
A certain monomer battery voltage in a certain module is lower than the average voltage of this module cell, as Un＜U ' (n is a positive integer), then begins cell n is carried out equilibrium.At this moment, the inner electronic switch of microprocessor in the monomer bag (MPU) control, switch closure, through electronic switch, cell absorbs the electric current on the equalizing bus bar, and when this monomer battery voltage reached the average voltage of cell in the energy-storage units, electronic switch disconnected, finish the equilibrium of this joint cell, transfer to the cell of another joint low-voltage.If the voltage in a certain module is all balanced, but the average voltage of this module monomer is lower than the average voltage of whole energy-storage units, then the electronic switch of all cells of this module is all closed, absorb the electric current on the equalizing bus bar, each single battery in the module is all mended, reach the average voltage of energy-storage units module up to the average voltage of this module, finish the equilibrium of energy-storage units.
The present invention is by providing a kind of benefit electrical equalization scheme of external batteries formula, it adopts the bus equalization mode, balanced power input all connects on the electrode of battery unit, can carry out equilibrium to single battery at any time, as long as there is monomer battery voltage low, satisfy equilibrium condition, no matter energy-storage units or module are in charging, discharge or laying state, all can be balanced immediately, realize effective dynamic equalization, in balancing procedure, can not produce a large amount of heats in addition, improve efficiency for charge-discharge.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (6)
1. the external connection battery group formula of an energy-storage system is mended the electrical equalization system, it is characterized in that, comprise Blast Furnace Top Gas Recovery Turbine Unit (TRT), electric energy combination system, dc bus, first charging module, first batteries, second charging module, second batteries, DC/DC converter, relay, equalizing bus bar, combining inverter and line module, described Blast Furnace Top Gas Recovery Turbine Unit (TRT) is connected to the electric energy combination system, described electric energy combination system is connected to combining inverter by dc bus, and described combining inverter connects line module; Described first charging module and second charging module all are connected on the dc bus, described first charging module connects first batteries, described second charging module connects second batteries, described first batteries connects DC/DC converter and relay successively, described relay is connected to second batteries by equalizing bus bar, and described first batteries is mended electrical equalization by equalizing bus bar to second batteries.
2. the external connection battery group formula of energy-storage system according to claim 1 is mended the electrical equalization system, it is characterized in that, described second batteries comprises a plurality of cells, all cells are divided into a plurality of energy-storage modules, described energy-storage module comprises balanced power input, electric energy output end and control end, the balanced power input of each energy-storage module is connected in parallel, and the electric energy output end of each energy-storage module is connected in series, and described control end is connected to the energy storage control unit.
3. the external connection battery group formula of energy-storage system according to claim 2 is mended the electrical equalization system, it is characterized in that, each energy-storage module comprises at least two monomer bags that are connected in series, described monomer bag comprises a cell, one microprocessor and an isolation module, described monomer is wrapped and is provided with positive limit, the negative pole point, LIN bus and equalizing bus bar, the two poles of the earth of described cell respectively correspondence be connected that positive limit and negative pole point are gone up and microprocessor on, described equalizing bus bar is connected on the microprocessor, described LIN bus is connected on the microprocessor by isolation module, and described LIN bus is connected on the control end; Described equalizing bus bar is connected on the balanced power input; Described positive limit is connected electric energy output end with negative pole point.
4. the external connection battery group formula of energy-storage system according to claim 1 is mended the electrical equalization system, it is characterized in that, described Blast Furnace Top Gas Recovery Turbine Unit (TRT) is provided with many covers, and all is connected to the electric energy combination system.
5. the external connection battery group formula of an energy-storage system is mended the electrical equalization method, it is characterized in that, described microprocessor is gathered the voltage of each cell in the energy-storage module, and send to the energy storage control unit, described energy storage control unit calculates the average voltage of the cell in each energy-storage module, the average voltage of cell in a certain monomer battery voltage in a certain energy-storage module is lower than its place energy-storage module, then the microprocessor controls cell in the monomer bag is connected with equalizing bus bar, cell absorbs the electric current on the equalizing bus bar, begins this cell is carried out equilibrium; When this monomer battery voltage reached the average voltage of cell in the energy-storage module, cell and equalizing bus bar disconnected, and finish the equilibrium of this joint cell, and the cell to another joint low-voltage carries out equilibrium treatment then.
6. the external connection battery group formula of energy-storage system according to claim 5 is mended the electrical equalization method, it is characterized in that, if the voltage of all cells in a certain energy-storage module is all balanced, but be lower than the average voltage between each energy-storage module in the energy-storage system, then all cells of this energy-storage module are connected with equalizing bus bar, absorb the electric current on the equalizing bus bar, each single battery in the energy-storage module is all mended, reach the average voltage of energy-storage units module up to the voltage of this energy-storage module, finish the equilibrium of energy-storage system.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102684264A (en) * | 2012-05-11 | 2012-09-19 | 许继集团有限公司 | Full-automatic charge control method for battery of battery recharge and replacement station |
| CN103532194A (en) * | 2013-10-18 | 2014-01-22 | 北京交通大学 | Self-balance control strategy for battery SOC (State-of-Charge) in chain type energy storage system powered by independent batteries |
| CN104135022A (en) * | 2014-08-19 | 2014-11-05 | 四川省科本哈根能源科技有限公司 | Wind and solar parallel electricity generation operation method |
| CN105244938A (en) * | 2015-09-22 | 2016-01-13 | 苏州工业园区职业技术学院 | Battery management device with energy storage unit |
| CN107244239A (en) * | 2017-08-04 | 2017-10-13 | 聊城中通轻型客车有限公司 | A kind of electric automobile solar recharging system and control method |
| CN107565677A (en) * | 2017-08-24 | 2018-01-09 | 深圳市航天新源科技有限公司 | A kind of more bus high-power power-supply controller of electric |
| CN109148977A (en) * | 2017-06-19 | 2019-01-04 | 周锡卫 | One kind being based on cell batteries dynamic monitoring balancer and control method |
| CN109143077A (en) * | 2018-08-27 | 2019-01-04 | 淮安信息职业技术学院 | A kind of equal balance system of new energy lithium battery automobile bus type |
| CN109687548A (en) * | 2018-12-28 | 2019-04-26 | 中国船舶重工集团公司第七一九研究所 | A kind of battery group supplement electric-type active equalization device |
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Cited By (14)
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| CN102684264B (en) * | 2012-05-11 | 2014-06-04 | 许继电气股份有限公司 | Full-automatic charge control method for battery of battery recharge and replacement station |
| CN102684264A (en) * | 2012-05-11 | 2012-09-19 | 许继集团有限公司 | Full-automatic charge control method for battery of battery recharge and replacement station |
| CN103532194A (en) * | 2013-10-18 | 2014-01-22 | 北京交通大学 | Self-balance control strategy for battery SOC (State-of-Charge) in chain type energy storage system powered by independent batteries |
| CN104135022A (en) * | 2014-08-19 | 2014-11-05 | 四川省科本哈根能源科技有限公司 | Wind and solar parallel electricity generation operation method |
| CN104135022B (en) * | 2014-08-19 | 2016-03-23 | 四川省科本哈根能源科技有限公司 | A kind of parallel generator operation method of scene |
| CN105244938A (en) * | 2015-09-22 | 2016-01-13 | 苏州工业园区职业技术学院 | Battery management device with energy storage unit |
| CN109148977A (en) * | 2017-06-19 | 2019-01-04 | 周锡卫 | One kind being based on cell batteries dynamic monitoring balancer and control method |
| CN107244239A (en) * | 2017-08-04 | 2017-10-13 | 聊城中通轻型客车有限公司 | A kind of electric automobile solar recharging system and control method |
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| CN107565677A (en) * | 2017-08-24 | 2018-01-09 | 深圳市航天新源科技有限公司 | A kind of more bus high-power power-supply controller of electric |
| CN107565677B (en) * | 2017-08-24 | 2020-07-21 | 深圳市航天新源科技有限公司 | Multi-bus high-voltage high-power supply controller |
| CN109143077A (en) * | 2018-08-27 | 2019-01-04 | 淮安信息职业技术学院 | A kind of equal balance system of new energy lithium battery automobile bus type |
| CN109687548A (en) * | 2018-12-28 | 2019-04-26 | 中国船舶重工集团公司第七一九研究所 | A kind of battery group supplement electric-type active equalization device |
| CN109687548B (en) * | 2018-12-28 | 2022-11-04 | 中国船舶重工集团公司第七一九研究所 | Supplementary electric formula of storage battery initiative balancing unit |
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