CN117713173A - Energy storage system and control method thereof - Google Patents
Energy storage system and control method thereof Download PDFInfo
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- CN117713173A CN117713173A CN202311731533.2A CN202311731533A CN117713173A CN 117713173 A CN117713173 A CN 117713173A CN 202311731533 A CN202311731533 A CN 202311731533A CN 117713173 A CN117713173 A CN 117713173A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000002159 abnormal effect Effects 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims description 30
- 230000007935 neutral effect Effects 0.000 claims description 9
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
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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
- H01M10/4285—Testing apparatus
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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
- H02J15/00—Systems for storing electric energy
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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
- 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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- 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)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an energy storage system and a control method thereof, wherein the energy storage system comprises a battery management system, a control module, an energy storage output end, a plurality of battery clusters and a plurality of electric control switch modules; each electric control switch module is connected with the corresponding battery cluster and connected with the control module and the energy storage output end respectively; each electronic control switch module can be connected to a battery management system; the battery management system can monitor abnormal signals of each electric control switch module and send control signals to the control module according to the abnormal signals; the control module is connected with the energy storage output end and the battery management system and can cut off the connection between all the battery clusters and the energy storage output end according to the control signal. According to the invention, when one or more battery clusters are broken, all the battery clusters of the whole energy storage system can be timely controlled to stop working, so that the electrical elements in the rest battery clusters are prevented from being burnt out due to overcurrent, the safety of the energy storage system in the use process is further improved, and the service life of the battery clusters is also prolonged.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to an energy storage system and a control method thereof.
Background
With the rapid development of lithium battery technology, energy storage systems have also been developed rapidly. Large and medium energy storage systems are generally powered outwards simultaneously after a plurality of groups of battery clusters are connected in parallel.
The existing energy storage system comprises a plurality of groups of battery clusters, an energy storage converter PCS, a cluster bus cabinet, an alternating current power distribution cabinet, a grid-connected cabinet and other components; under normal conditions, a corresponding relation exists between the energy storage system and the load, the number of battery clusters of the energy storage system is generally matched according to the size of the load, and during normal operation, all battery clusters of the energy storage system simultaneously supply power to the load, and the power output by each cluster and the electrical components on the corresponding circuit completely meet the power supply requirement.
When one or more battery clusters are broken, in order to meet the normal use of the load, the power or current output by the remaining battery clusters (i.e. other battery clusters which are not broken) is increased, so that the risk of overcurrent of electric elements in the remaining battery clusters is caused, the overcurrent of the electric elements is burnt out, and the service life of the battery clusters is further influenced.
Disclosure of Invention
The invention provides an energy storage system and a control method thereof, which can timely control all battery clusters of the whole energy storage system to stop working when one or more battery clusters are broken, prevent electric elements in the rest battery clusters from being burnt out due to overcurrent, further improve the safety of the energy storage system in the use process and also prolong the service life of the battery clusters.
In a first aspect, an embodiment of the present invention provides an energy storage system, including: the system comprises a battery management system, a control module, an energy storage output end, a plurality of battery clusters and a plurality of electric control switch modules corresponding to the battery clusters;
each battery cluster is connected with the battery management system;
each electric control switch module is connected with a corresponding battery cluster and is connected with the control module and the energy storage output end respectively; each of the electronically controlled switch modules is connectable to the battery management system;
the battery management system monitors abnormal signals of the electric control switch modules and sends control signals to the control modules according to the abnormal signals;
the control module is connected with the energy storage output end and the battery management system, and can cut off connection of all the battery clusters and the energy storage output end according to the control signal.
In one embodiment, each of the electronic control switch modules includes a conductive unit and a feedback unit; one end of each conductive unit is connected with the control module, and the other end of each conductive unit is connected with the energy storage output end; and two ends of each feedback unit are respectively connected with the battery management system after being connected in series.
In one embodiment, the two ends of each feedback unit after being connected in series are respectively connected with the battery management system, which comprises: one end of each feedback unit is connected with a first detection end of the battery management system after being connected in series, and the other end of each feedback unit is connected with a second detection end of the battery management system; the first detection end and the second detection end of the battery management system can detect the breaking signals of the feedback units, and the battery management system sends control signals to the control module according to the breaking signals, so that the control module cuts off connection between all the battery clusters and the energy storage output end.
In one embodiment, the control module includes an ac relay including a first switching section and a first coil section; the first end of the first coil part is connected with a first control end of the battery management system, and the second end of the first coil part is connected with a second control end of the battery management system; the first end of the first switch part is connected with the conductive unit, and the second end of the first switch part is connected with the energy storage output end; the battery management system sends a control signal to the control module according to the abnormal signal, and the first switch part responds to the control signal to disconnect the connection between the battery clusters and the energy storage output end.
In one embodiment, the system further comprises a scram control module, wherein the scram control module comprises a scram switch and an alternating current power supply module; the first end of the alternating current power supply module is connected with the first end of the first coil part, and the second end of the alternating current power supply module is connected with the emergency stop switch and then connected to the second end of the first coil part; and cutting off the connection between all the battery clusters and the energy storage output end by switching off the emergency stop switch.
In one embodiment, the energy storage output terminal comprises an energy storage converter, the energy storage converter comprises a live wire and a neutral wire (N-wire), one end of each conductive unit is connected to the neutral wire, and the other end is connected to the control module.
In one embodiment, a first end of the first switch portion is connected to the conductive unit, and a second end of the first switch portion is connected to the live wire.
In one embodiment, one of the first control terminal and the second control terminal of the battery management system is connected to a high-side circuit of the battery management system, and the other is connected to a low-side circuit of the battery management system.
In one embodiment, the electrically controlled switch module includes a second relay including a second coil portion and a second switch portion; the conductive unit includes the second coil portion, and the feedback unit includes the second switch portion.
In a second aspect, an embodiment of the present invention provides a control method of an energy storage system, which is applied to the energy storage system provided in any of the foregoing embodiments, where the control method includes:
s1, the battery management system acquires abnormal signals of each electric control switch module and sends control signals to the control module according to the abnormal signals;
s2, the control module cuts off connection between all the battery clusters and the energy storage output end according to the control signal.
The energy storage system provided by the embodiment of the invention comprises a battery management system, a control module, an energy storage output end, a plurality of battery clusters and a plurality of electric control switches; each battery cluster is connected with a battery management system; each electric control switch module is connected with the corresponding battery cluster and connected with the control module and the energy storage output end respectively; each electronic control switch module can be connected to a battery management system; the battery management system can monitor abnormal signals of each electric control switch module and send control signals to the control module according to the abnormal signals; the control module is connected with the energy storage output end and the battery management system and can cut off the connection between all the battery clusters and the energy storage output end according to the control signal. That is, through setting up the automatically controlled switch module that corresponds with a plurality of battery clusters one by one, can be when one or more automatically controlled switch module take place unusual, all battery clusters that control whole energy storage system through automatically controlled switch module in time stop work, prevent that the electrical component in the remaining battery cluster from burning out because of the overflow, and then promote the security of energy storage system in the use, also improve the life of battery cluster.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another energy storage system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another energy storage system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another energy storage system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another energy storage system according to an embodiment of the present invention;
fig. 6 is a flowchart of a control method of an energy storage system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention, as shown in fig. 1, the energy storage system includes: the battery management system 11, the control module 12, the energy storage output terminal, a plurality of battery clusters 14 and a plurality of electric control switch modules 15 corresponding to the plurality of battery clusters 14.
Each electric control switch module 15 is respectively connected with the corresponding battery cluster 14 and is respectively connected with the control module 12 and the energy storage output end; each electronically controlled switch module 15 can be connected to the battery management system 11.
The battery management system 11 monitors the abnormal signals of the electric control switch modules 15 and sends control signals to the control module 12 according to the abnormal signals; the control module 12 connects the energy storage output terminal with the battery management system 11, and can cut off connection of all the battery clusters 14 with the energy storage output terminal according to the control signal.
Specifically, the output end of the energy storage converter is used as an energy storage output end. (not shown in the drawings)
The battery management system 11 is configured to output a corresponding control signal to the control module 12 according to the abnormal signal of each electric control switch module 15, and the control module 12 is configured to control the power on and power off of the electric control switch modules 15 according to the control signal of the control end of the battery management system 11.
The battery management system 11 (Battery Management System, BMS) is a set of control system for protecting the use safety of the battery cluster 14, and can acquire the operation parameters of the battery cluster at any time, further monitor the use state of the battery cluster 14, and output corresponding control signals to the control module 12 according to the operation parameters of the battery cluster 14. The fault signal is output when the operation parameter of any one of the battery clusters is not within the preset range, and the normal operation signal is output when the operation parameter of each of the battery clusters is within the preset range. Optionally, the operating parameters of the battery cluster 14 include at least one of voltage, electrical energy capacity, and internal resistance.
The control module 12 may be various modules having a function of controlling the energization and the de-energization of the electronically controlled switch module 15 according to a control signal of a control terminal of the battery management system 11. The control module 12 may be an ac relay or a dc relay, for example.
Alternatively, the control module 12 controls the electric control switch module to be powered on when the battery management system 11 outputs a fault signal, and to be powered off when the battery management system 11 outputs a normal operation signal.
Alternatively, the control module 12 controls the electric control switch module to be powered off when the battery management system 11 outputs a fault signal, and to be powered on when the battery management system 11 outputs a normal operation signal.
The energy storage system provided by the embodiment of the invention comprises a battery management system, a control module, an energy storage output end, a plurality of battery clusters and a plurality of electric control switches; the battery management system is used for acquiring the operation parameters of the battery clusters, outputting corresponding control signals to the control module according to the operation parameters of each battery cluster, and controlling all the battery clusters of the whole energy storage system to stop working through the electric control switch module in time when one or more battery clusters are broken, so that the electrical elements in the remaining battery clusters are prevented from being burnt out due to overcurrent, the safety of the energy storage system in the use process is further improved, and the service life of the battery clusters is also prolonged.
Fig. 2 is a schematic structural diagram of another energy storage system according to an embodiment of the present invention, as shown in fig. 2, each of the electronic control switch modules 15 includes a conductive unit 150 and a feedback unit 151; the two ends of each conductive unit 150 are respectively connected with the battery management system 11 after being connected in series; the on-off of each feedback unit 151 is used for controlling the on-off of the corresponding battery cluster 14 and the energy storage output end.
The battery management system 11 includes: one end of each conductive unit 150 is connected with a first detection end FB1 of the battery management system after being connected in series, and the other end of each conductive unit is connected with a second detection end FB2 of the battery management system; the first detection terminal FB1 and the second detection terminal FB2 of the battery management system 11 are capable of detecting the disconnection signal of each conductive unit 150, and the battery management system 11 sends a control signal to the control module 12 according to the disconnection signal, so that the control module 12 cuts off the connection between all the battery clusters 14 and the energy storage output terminal.
Specifically, the energy storage output terminal includes an energy storage converter 13, where the energy storage converter 13 includes a live wire and a neutral wire (N-wire), and one end of each conductive unit 150 is connected to the neutral wire, and the other end is connected to the control module 12. The energy storage converter 13 (Power Conversion System, PCS) can convert the high-voltage direct current output by the battery cluster into alternating current to supply power to the load.
The N electric control switch modules 15 are correspondingly arranged with the N battery clusters 14, the first ends of the electric control switch modules 15 are connected with the corresponding battery clusters 14, the second ends of the electric control switch modules 15 are connected with the input ends of the energy storage current transformer 13, and the output ends of the energy storage current transformer 13 are used as energy storage output ends. N is a positive integer greater than or equal to 2.
The third end of the first electric control switch module is connected with a first detection end FB1 of the battery management system 11, the fourth end of the Kth electric control switch module is connected with the third end of the K+1th electric control switch module, and the fourth end of the Nth electric control switch module is connected with a second detection end FB2 of the battery management system 11; the fifth end of each electric control switch module 15 is connected to the first power supply end L1, the sixth end of each electric control switch module 15 is connected to the first end of the control module 12, and the second end of the control module 12 is connected to the second power supply end L2; wherein K is a positive integer greater than or equal to 1 and less than N.
The first power supply end L1 may be provided by a neutral line of the utility power grid, and the second power supply end L2 may be provided by a live line of 220V ac power of the utility power grid.
Alternatively, the electronic control switch module 15 includes a second relay including a second coil portion KM2 and a second switch portion K2; the conductive unit 150 includes a second coil part KM2, and the feedback unit 151 includes a second switching part K2, a third switching part K3, and a fourth switching part K4; the first end of the second coil portion KM2 is used as a fifth end of the electric control switch module 15, and the second end of the second coil portion KM2 is used as a sixth end of the electric control switch module 15; the first end of the second switch part K2 is used as the third end of the electric control switch module 15, and the second end of the second switch part K2 is used as the fourth end of the electric control switch module 15; the first end of the third switch part K3 is correspondingly connected with the positive connection end P+ of the battery cluster, and the second end of the third switch part K3 is connected with the first input end of the energy storage converter 13; the first end of the fourth switching part K4 is correspondingly connected with the negative connecting end P-of the battery cluster, the second end of the fourth switching part K4 is connected with the second input end of the energy storage converter 13, the first end of the third switching part K3 and the first end of the fourth switching part K4 serve as the first end of the electric control switch module 15, and the second end of the third switching part K3 and the second end of the fourth switching part K4 serve as the second end of the electric control switch module 15.
Alternatively, the electronic control switch module 15 may adopt a molded case circuit breaker with a shunt release, wherein the shunt release is a conductive unit 150, the molded case circuit breaker is a feedback unit 151, and the release of the shunt release drives the molded case circuit breaker to break.
With continued reference to fig. 2, the specific working process of the energy storage system provided in this embodiment is:
after the energy storage system starts to operate, the battery management system 11 acquires the operation parameters of each battery cluster 14 in real time, determines whether the operation parameters of each battery cluster are within a preset range, outputs a fault signal when the operation parameters of any battery cluster are not within the preset range, and outputs a normal operation signal when the operation parameters of each battery cluster are within the preset range.
If the control module 12 controls the electric control switch module to be powered on when the battery management system 11 outputs a fault signal, controls the electric control switch module to be powered off when the battery management system 11 outputs a normal working signal, and the switch part between the battery cluster 14 and the energy storage converter 13 is a normally closed contact, the connection between each battery cluster 14 and the energy storage converter 13 is disconnected when the coil part of the electric control switch module 15 is powered on, and the connection between each battery cluster 14 and the energy storage converter 13 is conducted when the coil part of the electric control switch module 15 is powered off.
If the control module 12 controls the electric control switch module to be powered off when the battery management system 11 outputs a fault signal, controls the electric control switch module to be powered on when the battery management system 11 outputs a normal working signal, and the switch part between the battery cluster 14 and the energy storage converter 13 is a normally open contact, the connection between each battery cluster 14 and the energy storage converter 13 is disconnected when the coil part of the electric control switch module 15 is powered off, and the connection between each battery cluster 14 and the energy storage converter 13 is conducted when the coil part of the electric control switch module 15 is powered on.
The battery management system 11 may also determine the power-on and power-off states of the electronic control switch module 15 according to the feedback of the first detection terminal FB1 and the second detection terminal FB 2. When the power-on state or power-off state of the electric control switch module 15 fed back by the first detection end FB1 and the second detection end FB2 is not matched with the power-on state or power-off state of the electric control switch module 15 controlled by the control module 12 according to the control signal of the control end of the battery management system 11, the battery management system 11 can send out a corresponding control signal again, so that the power-on or power-off of the electric control switch module 15 is controlled again, and the normal operation of the electric control switch module is ensured. For example, if the battery management system 11 outputs a fault signal, the control module 12 controls the electric control switch module 15 to be powered on, so that when the connection between each battery cluster 14 and the energy storage converter 13 is disconnected, the battery management system 11 determines that the electric control switch module 15 is in a power-off state according to the feedback of the first detection end FB1 and the second detection end FB2, at this time, the battery management system 11 can send a fault signal to the control module 12 again through its own control end, and the control module 12 controls the electric control switch module 15 to be powered on again, so as to ensure that all the battery clusters are powered off simultaneously when the operation parameters of any battery cluster are not within the preset range.
The energy storage system comprises a battery management system, a control module, an energy storage converter, at least two battery clusters and at least two electric control switch modules, wherein the battery management system is used for acquiring the operation parameters of the battery clusters, outputting corresponding control signals to the control module according to the operation parameters of each battery cluster, and determining the power-on and power-off states of the electric control switch modules according to the feedback of a first detection end and a second detection end; the power-on and power-off of the electric control switch module is controlled by the control module according to a control signal of a control end of the battery management system; disconnecting each battery cluster from the energy storage converter when the electric control switch module is electrified, and connecting each battery cluster with the energy storage converter when the electric control switch module is powered off; or the connection between each battery cluster and the energy storage converter is disconnected when the electric control switch module is powered off, and the connection between each battery cluster and the energy storage converter is conducted when the electric control switch module is powered on, that is, the at least two electric control switch modules are arranged, and the third ends and the fourth ends of the at least two electric control switch modules are sequentially connected in series, so that when one or more battery clusters are disconnected, all battery clusters of the whole energy storage system can be timely controlled to stop working through the electric control switch modules, the electric elements in the remaining battery clusters are prevented from being burnt out due to overcurrent, the safety of the energy storage system in the use process is further improved, and the service life of the battery clusters is also prolonged.
Fig. 3 is a schematic structural diagram of yet another energy storage system according to an embodiment of the present invention, as shown in fig. 3, optionally, the control module 12 includes an ac relay 120, and the ac relay 120 includes a first switch portion K1 and a first coil portion KM1.
A first end of the first coil portion KM1 is connected with a first control end of the battery management system 11, and a second end of the first coil portion KM1 is connected with a second control end of the battery management system 11.
The first end of the first switch part K1 is connected with the conductive unit 150, and the second end of the first switch part K1 is connected with the energy storage output end; the battery management system 11 sends a control signal to the control module 12 according to the abnormal signal, and the first switch portion K1 disconnects the connection with each conductive unit 150 in response to the control signal, so as to disconnect all the battery clusters 14 from the energy storage output terminal.
The first end of the first switch portion K1 is connected to the conductive unit 150, and the second end of the first switch portion K1 is connected to the live wire.
One of the first control terminal and the second control terminal of the battery management system 11 is connected to a high-side circuit of the battery management system, and the other is connected to a low-side circuit of the battery management system.
The battery management system 11 is configured to determine whether the operation parameters of each battery cluster 14 are within a preset range, output a fault signal when the operation parameters of any battery cluster 14 are not within the preset range, output a normal operation signal when the operation parameters of each battery cluster 14 are within the preset range, and determine the power-on and power-off states of the electric control switch module 15 according to feedback of the first detection end FB1 and the second detection end FB2; the operating parameters of the battery cluster 14 include at least one of voltage, electrical energy capacity, and internal resistance, among others.
Optionally, the operating parameters of the battery clusters 14 include voltages, the preset range includes a maximum value and a minimum value, the battery management system 11 outputs a fault signal when the operating parameter of any one of the battery clusters 14 is not within the preset range, and outputs a normal operation signal when the operating parameter of each of the battery clusters 14 is within the preset range. That is, the battery management system 11 outputs the failure signal when the difference between the maximum value of the voltage and the minimum value of the voltage of any one of the battery clusters 14 is greater than the first prescribed value, and outputs the normal operation signal when the difference between the maximum value of the voltage and the minimum value of the voltage of any one of the battery clusters 14 is greater than or equal to the first prescribed value. The first defined value may be 10mV, for example.
Alternatively, the operation parameters of the battery clusters 14 include the electric power capacity, the battery management system 11 outputs the malfunction signal when the difference between the maximum value of the electric power capacity and the minimum value of the electric power capacity of any one of the battery clusters 14 is greater than the second prescribed value, and outputs the normal operation signal when the difference between the maximum value of the electric power capacity and the minimum value of the electric power capacity of any one of the battery clusters 14 is greater than or equal to the second prescribed value. The second prescribed value may be, for example, 0.5Ah.
Alternatively, the operation parameters of the battery clusters 14 include internal resistances, the battery management system 11 outputs a failure signal when a difference between a maximum value of the internal resistances of any one of the battery clusters 14 and a minimum value of the internal resistances is greater than a third prescribed value, and outputs a normal operation signal when a difference between a maximum value of the internal resistances of any one of the battery clusters 14 and a minimum value of the internal resistances is greater than or equal to the third prescribed value. The third prescribed value may be, for example, 10mΩ.
The ac relay 120 is configured to control the first coil portion KM1 to be electrified according to a fault signal, control the first switch portion K1 to be turned on, and further control the electric control switch module 15 to be electrified, and control the first coil portion KM1 to be powered off according to a normal working signal, control the first switch portion K1 to be turned off, and further control the electric control switch module 15 to be powered off. Or, the ac relay 120 is configured to control the first coil portion KM1 to lose power according to the fault signal, so as to control the first switch portion K1 to lose power, and further control the electronic control switch module 15 to lose power, and control the first coil portion KM1 to lose power according to the normal working signal, so as to control the first switch portion K1 to lose power, and further control the electronic control switch module 15 to lose power.
Specifically, when the first switch portion K1 is a normally open contact, the switch portion between the battery cluster 14 and the energy storage converter 13 should be a normally closed contact, and the ac relay 120 controls the first coil portion KM1 to be electrified according to the fault signal, controls the first switch portion K1 to be turned on, and further controls the electric control switch module 15 to be electrified, so as to disconnect each battery cluster from the energy storage converter. The ac relay 120 further controls the first coil portion KM1 to lose electricity according to the normal operating signal, controls the first switch portion K1 to be turned off, and further controls the electronic control switch module 15 to be turned off, so as to conduct connection between each battery cluster 14 and the energy storage converter 13.
When the first switch portion K1 is a normally closed contact, the switch portion between the battery cluster 14 and the energy storage converter 13 should be a normally open contact at this time, and the ac relay 120 controls the first coil portion KM1 to lose power according to the fault signal, controls the first switch portion K1 to be disconnected, and further controls the electronic control switch module 15 to be disconnected, so as to disconnect each battery cluster from the energy storage converter. The ac relay 120 further controls the first coil portion KM1 to be electrified according to the normal working signal, controls the first switch portion K1 to be turned on, and further controls the electric control switch module 15 to be electrified so as to turn on the connection between each battery cluster 14 and the energy storage converter 13. Fig. 2 schematically shows a case where the first switching section K1 is a normally open contact.
The energy storage system also includes a scram control module 16, the scram control module 16 including a scram switch SW and an ac power module 160.
The first end of the alternating current power supply module is connected with the first end of the first coil part, and the second end of the alternating current power supply module is connected with the emergency stop switch and then connected to the second end of the first coil part; the connection between all the battery clusters and the energy storage output end is cut off by opening the emergency stop switch.
The energy storage output end comprises an energy storage converter, the energy storage converter comprises a live wire and a neutral wire (N wire), one end of each conductive unit is connected to the neutral wire, and the other end of each conductive unit is connected with the control module.
The first end of the ac power module 160 is connected to the first end of the first coil portion KM1, the second end of the ac power module 160 is connected to the first end of the emergency stop switch SW, and the ac power module 160 is configured to supply power to the first coil portion KM1 when the emergency stop switch is closed. The second end of the emergency stop switch SW is connected to the second end of the first coil KM1, and the emergency stop switch SW is configured to be closed when the battery management system 11 cannot control the first coil KM1 to be powered, so that the first coil KM1 is powered.
Specifically, the emergency stop switch SW is a manual control switch, and when the battery management system 11 cannot control the first coil portion KM1 to obtain electricity, the battery management system 11 can send an alarm signal through the alarm module, so that a manager can know the working state of the energy storage system conveniently.
With continued reference to fig. 3, the specific working process of the energy storage system provided in this embodiment is:
after the energy storage system starts to operate, the battery management system 11 acquires the operation parameters of each battery cluster 14 in real time, determines whether the operation parameters of each battery cluster are within a preset range, outputs a fault signal when the operation parameters of any battery cluster are not within the preset range, and outputs a normal operation signal when the operation parameters of each battery cluster are within the preset range.
When the first switch portion K1 is a normally open contact, the switch portion between the battery clusters 14 and the energy storage converter 13 should be a normally closed contact at this time, the ac relay 120 controls the first coil portion KM1 to be electrified according to the fault signal, controls the first switch portion K1 to be turned on, and further controls the electric control switch module 15 to be electrified, and at this time, the coil portion of the electric control switch module 15 disconnects each battery cluster 14 from the energy storage converter 13. The ac relay 120 further controls the first coil portion KM1 to lose electricity according to the normal operating signal, controls the first switch portion K1 to be turned off, and further controls the electronic control switch module 15 to be turned off, so as to conduct connection between each battery cluster 14 and the energy storage converter 13.
When the first switch portion K1 is a normally closed contact, the switch portion between the battery cluster 14 and the energy storage converter 13 should be a normally open contact at this time, and the ac relay 120 controls the first coil portion KM1 to lose power according to the fault signal, controls the first switch portion K1 to be disconnected, and further controls the electronic control switch module 15 to be disconnected, so as to disconnect each battery cluster from the energy storage converter. The ac relay 120 further controls the first coil portion KM1 to be electrified according to the normal working signal, controls the first switch portion K1 to be turned on, and further controls the electric control switch module 15 to be electrified so as to turn on the connection between each battery cluster 14 and the energy storage converter 13.
The battery management system 11 may also determine the power-on and power-off states of the electronic control switch module 15 according to the feedback of the first detection terminal FB1 and the second detection terminal FB 2. When the power-on state or power-off state of the electric control switch module 15 fed back by the first detection end FB1 and the second detection end FB2 is not matched with the power-on state or power-off state of the electric control switch module 15 controlled by the control module 12 according to the control signal of the control end of the battery management system 11, the battery management system 11 can send out a corresponding control signal again, so that the electric control switch module 15 is controlled to be powered on or powered off again, and normal operation of the electric control switch module 15 is ensured.
Fig. 4 is a schematic structural diagram of another energy storage system according to an embodiment of the present invention, as shown in fig. 4, optionally, the battery cluster 14 includes a high voltage box 140, a plurality of battery modules 141 and a plurality of slave control modules 142, and the high voltage box 140 includes a master control module 143.
The input ends of the slave control modules 142 are connected with the battery modules 141 in a one-to-one correspondence manner, the output ends of the slave control modules 142 are connected with the input ends of the main control modules 143, and the slave control modules 142 are used for detecting the operation parameters of the correspondingly connected battery modules 141 and transmitting the operation parameters of the battery modules 141 to the main control modules 143; the output end of the main control module 143 is connected with the input end of the battery management system 11, and the main control module 143 is used for adjusting the electric energy capacity of each battery module 141 according to the operation parameters of each battery module 141 and transmitting the operation parameters of each battery module 141 to the battery management system 11.
The high voltage tank 140 further comprises a DC-DC conversion module 144, the power supply terminal of the battery management system 11 being connected to the output terminal of the DC-DC conversion module 144, the DC-DC conversion module 144 being configured to convert the first voltage into the second voltage for powering the battery management system 11.
Specifically, the plurality of battery modules 141 are connected in parallel and/or in series to form a high-voltage direct current, the high-voltage direct current is converged into the high-voltage box 140, and the high-voltage direct current converged by the high-voltage box 140 is converted into an alternating current by the energy storage converter 13 after passing through the electric control switch module 15 to supply power to a load.
The battery management system 11 is connected to the DC-DC conversion module 144 in any one of the high voltage boxes 140, and a second voltage of the battery management system 11 is supplied from any one of the DC-DC conversion modules 144, wherein the second voltage is a low voltage direct current. The second voltage may be 12V, and the second voltage may also be 24V, for example.
Fig. 5 is a schematic structural diagram of yet another energy storage system according to an embodiment of the present invention, as shown in fig. 5, the energy storage system includes: the system comprises a battery management system 11, a control module 12, an energy storage converter 13, N battery clusters 14 and N electric control switch modules 15; wherein N is a positive integer greater than or equal to 2.
Alternatively, the control module 12 includes an ac relay 120, and the ac relay 120 includes a first switching section K1 and a first coil section KM1.
Alternatively, the electronic control switch module 15 includes a conductive unit 150 and a feedback unit 151, the conductive unit 150 includes a second coil part KM2, and the feedback unit 151 includes a second switch part K2, a third switch part K3, and a fourth switch part K4.
The energy storage system also includes a scram control module 16, the scram control module 16 including a scram switch K5 and an AC power module 160.
The battery cluster 14 includes a high voltage box 140, a plurality of battery modules 141, and a plurality of slave modules 142, and the high voltage box 140 includes a master control module 143 and a DC-DC conversion module 144.
With continued reference to fig. 5, the specific working process of the energy storage system provided in this embodiment is:
after the energy storage system starts to operate, the battery management system 11 acquires the operation parameters of each battery cluster 14 in real time, determines whether the operation parameters of each battery cluster are within a preset range, outputs a fault signal when the operation parameters of any battery cluster are not within the preset range, and outputs a normal operation signal when the operation parameters of each battery cluster are within the preset range.
When the first switch portion K1 is a normally open contact, the second switch portion K2, the third switch portion K3 and the fourth switch portion K4 are all normally closed contacts, the ac relay 120 controls the first coil portion KM1 to be powered on according to the fault signal, the first switch portion K1 is turned on, the second coil portion KM2 is powered on, and the second switch portion K2, the third switch portion K3 and the fourth switch portion K4 are all turned off to disconnect the battery clusters 14 from the energy storage converter 13. The ac relay 120 further controls the first coil portion KM1 to lose power according to the normal operation signal, controls the first switch portion K1 to be turned off, and controls the second coil portion KM2 to lose power, wherein the second switch portion K2, the third switch portion K3 and the fourth switch portion K4 are all turned on to conduct connection between each battery cluster 14 and the energy storage converter 13. Fig. 5 schematically shows a case where the first switching section K1 is a normally open contact, and the second switching section K2, the third switching section K3, and the fourth switching section K4 are normally closed contacts.
When the first switch portion K1 is a normally closed contact, the second switch portion K2, the third switch portion K3 and the fourth switch portion K4 are normally open contacts, the ac relay 120 controls the first coil portion KM1 to lose power according to the fault signal, controls the first switch portion K1 to be disconnected, and the second coil portion KM2 loses power, and the second switch portion K2, the third switch portion K3 and the fourth switch portion K4 are disconnected to disconnect each battery cluster from the energy storage converter. The ac relay 120 further controls the first coil portion KM1 to be electrified according to the normal operation signal, controls the first switch portion K1 to be turned on, controls the second coil portion KM2 to be electrified, and controls the second switch portion K2, the third switch portion K3 and the fourth switch portion K4 to be turned on so as to conduct connection between each battery cluster 14 and the energy storage converter 13.
The battery management system 11 may also determine the power-on and power-off states of the electronic control switch module 15 according to the feedback of the first detection terminal FB1 and the second detection terminal FB 2. When the power-on state or power-off state of the electric control switch module 15 fed back by the first detection end FB1 and the second detection end FB2 is not matched with the power-on state or power-off state of the electric control switch module controlled by the control module 12 according to the control signal of the control end of the battery management system 11, the battery management system 11 can send out a corresponding control signal again, so that the electric control switch module 15 is controlled to be powered on or powered off again, and normal operation of the electric control switch module is ensured.
Fig. 6 is a flowchart of a control method of an energy storage system according to an embodiment of the present invention, where the control method of an energy storage system is applied to the energy storage system provided in any of the foregoing embodiments. As shown in fig. 6, the control method of the energy storage system includes:
s1, the battery management system acquires abnormal signals of each electric control switch module and sends control signals to the control module according to the abnormal signals.
S2, the control module cuts off connection between all the battery clusters and the energy storage output end according to the control signal.
Specifically, with continued reference to fig. 1, the battery management system 11 is configured to output a corresponding control signal to the control module 12 according to the abnormal signal of each electronic control switch module 15, and the control module 12 is configured to control the power on and power off of the electronic control switch modules 15 according to the control signal of the control end of the battery management system 11.
The battery management system 11 (Battery Management System, BMS) is a set of control system for protecting the use safety of the battery cluster 14, and can acquire the operation parameters of the battery cluster at any time, further monitor the use state of the battery cluster 14, and output corresponding control signals to the control module 12 according to the operation parameters of the battery cluster 14. The fault signal is output when the operation parameter of any one of the battery clusters is not within the preset range, and the normal operation signal is output when the operation parameter of each of the battery clusters is within the preset range. Optionally, the operating parameters of the battery cluster 14 include at least one of voltage, electrical energy capacity, and internal resistance.
The control module 12 may be various modules having a function of controlling the energization and the de-energization of the electronically controlled switch module 15 according to a control signal of a control terminal of the battery management system 11. The control module 12 may be an ac relay or a dc relay, and the ac relay may be powered by a utility grid, so as to ensure that the control module does not consume electric energy of the battery cluster, thereby causing overdischarge of the battery cluster due to continuous consumption of electric energy of the control module in a standby state.
Alternatively, the control module 12 controls the electric control switch module to be powered on when the battery management system 11 outputs a fault signal, and to be powered off when the battery management system 11 outputs a normal operation signal.
Alternatively, the control module 12 controls the electric control switch module to be powered off when the battery management system 11 outputs a fault signal, and to be powered on when the battery management system 11 outputs a normal operation signal.
Optionally, the operating parameters of the battery cluster 14 include at least one of voltage, electrical energy capacity, and internal resistance.
According to the control method of the energy storage system, the battery management system is used for obtaining the operation parameters of the battery clusters, and outputting corresponding control signals to the control module according to the operation parameters of each battery cluster, so that when one or more battery clusters are broken, all the battery clusters of the whole energy storage system can be timely controlled to stop working through the electric control switch module, the electrical elements in the remaining battery clusters are prevented from being burnt out due to overcurrent, the safety of the energy storage system in the use process is further improved, and the service life of the battery clusters is also prolonged.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An energy storage system, comprising: the system comprises a battery management system, a control module, an energy storage output end, a plurality of battery clusters and a plurality of electric control switch modules corresponding to the battery clusters;
each battery cluster is connected with the battery management system;
each electric control switch module is connected with a corresponding battery cluster and is connected with the control module and the energy storage output end respectively; each of the electronically controlled switch modules is connectable to the battery management system;
the battery management system monitors abnormal signals of the electric control switch modules and sends control signals to the control modules according to the abnormal signals;
the control module is connected with the energy storage output end and the battery management system, and can cut off connection of all the battery clusters and the energy storage output end according to the control signal.
2. The energy storage system of claim 1, wherein each of the electronically controlled switch modules comprises a conductive unit and a feedback unit; one end of each conductive unit is connected with the control module, and the other end of each conductive unit is connected with the energy storage output end; and two ends of each feedback unit are respectively connected with the battery management system after being connected in series.
3. The energy storage system according to claim 2, wherein the two ends of each of the feedback units after being connected in series are respectively connected to the battery management system, and the energy storage system comprises: one end of each feedback unit is connected with a first detection end of the battery management system after being connected in series, and the other end of each feedback unit is connected with a second detection end of the battery management system;
the battery management system sends a control signal to the control module according to the breaking signals, so that the control module cuts off connection between all the battery clusters and the energy storage output end.
4. The energy storage system of claim 2, wherein the control module comprises an ac relay comprising a first switch portion and a first coil portion;
the first end of the first coil part is connected with a first control end of the battery management system, and the second end of the first coil part is connected with a second control end of the battery management system;
the first end of the first switch part is connected with the conductive unit, and the second end of the first switch part is connected with the energy storage output end;
the battery management system sends a control signal to the control module according to the abnormal signal, and the first switch part responds to the control signal to disconnect the connection between the battery clusters and the energy storage output end.
5. The energy storage system of claim 4, further comprising a scram control module comprising a scram switch and an ac power module;
the first end of the alternating current power supply module is connected with the first end of the first coil part, and the second end of the alternating current power supply module is connected with the emergency stop switch and then connected to the second end of the first coil part; and cutting off the connection between all the battery clusters and the energy storage output end by switching off the emergency stop switch.
6. The energy storage system of claim 2 or 4, wherein the energy storage output comprises an energy storage converter comprising a live wire and a neutral wire (N-wire), one end of each of the conductive units being connected to the neutral wire and the other end being connected to the control module.
7. The energy storage system of claim 6, wherein a first end of said first switch portion is connected to said conductive element and a second end of said first switch portion is connected to said hot wire.
8. The energy storage system of claim 4, wherein one of the first control terminal and the second control terminal of the battery management system is connected to a high side circuit of the battery management system, and wherein the other is connected to a low side circuit of the battery management system.
9. The energy storage system of claim 2, wherein the electronically controlled switch module comprises a second relay comprising a second coil portion and a second switch portion; the conductive unit includes the second coil portion, and the feedback unit includes the second switch portion.
10. A control method of an energy storage system, applied to the energy storage system according to any one of claims 1 to 8, the control method comprising:
s1, the battery management system acquires abnormal signals of each electric control switch module and sends control signals to the control module according to the abnormal signals;
s2, the control module cuts off connection between all the battery clusters and the energy storage output end according to the control signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311731533.2A CN117713173A (en) | 2023-12-15 | 2023-12-15 | Energy storage system and control method thereof |
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| CN202311731533.2A CN117713173A (en) | 2023-12-15 | 2023-12-15 | Energy storage system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118412555A (en) * | 2024-04-11 | 2024-07-30 | 苏州融和慧储能源有限公司 | Electric core management method and system based on dock |
| CN118554573A (en) * | 2024-05-06 | 2024-08-27 | 惠州市乐亿通科技股份有限公司 | Output control circuit of battery system |
-
2023
- 2023-12-15 CN CN202311731533.2A patent/CN117713173A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118412555A (en) * | 2024-04-11 | 2024-07-30 | 苏州融和慧储能源有限公司 | Electric core management method and system based on dock |
| CN118554573A (en) * | 2024-05-06 | 2024-08-27 | 惠州市乐亿通科技股份有限公司 | Output control circuit of battery system |
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