CN111381174A - Fuel cell test and lithium ion battery formation capacity-sharing coupling system and method - Google Patents
Fuel cell test and lithium ion battery formation capacity-sharing coupling system and method Download PDFInfo
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- CN111381174A CN111381174A CN201811620629.0A CN201811620629A CN111381174A CN 111381174 A CN111381174 A CN 111381174A CN 201811620629 A CN201811620629 A CN 201811620629A CN 111381174 A CN111381174 A CN 111381174A
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a fuel cell testing and lithium ion battery formation capacity-sharing coupling system, which comprises a fuel cell testing unit, an energy storage cell, a lithium ion battery formation capacity-sharing unit, an energy storage bidirectional inverter and an energy management unit, wherein the fuel cell testing unit is connected with the energy storage cell; the energy management unit is respectively in communication connection with the fuel cell testing unit, the energy storage cell, the lithium ion battery formation capacity-dividing unit and the energy storage bidirectional inverter, and the energy storage cell is respectively in electric connection with the fuel cell testing unit, the lithium ion battery formation capacity-dividing unit and the energy storage bidirectional inverter; also discloses a control method of the fuel cell testing and lithium ion battery formation capacity-sharing coupling system. The invention avoids the energy waste caused by the conventional resistance load consuming the electric energy generated by the fuel cell system through heat energy, and simultaneously saves the extra electric energy consumption for the resistance load cooling equipment.
Description
Technical Field
The invention relates to the technical field of fuel cell testing, in particular to a fuel cell testing and lithium ion battery formation capacity-sharing coupling system and method.
Background
Large-scale research, validation and testing of fuel cell stacks, fuel cell systems and fuel cell engines are indispensable steps before fuel cell applications. Since the fuel cell itself is a power generation device that continuously consumes hydrogen, the first scheme in the conventional performance test process is to consume the electric energy generated by the fuel cell system by heat energy using a resistive load, resulting in waste of resources and increase of cost. In addition, the commonly used electronic load needs heat dissipation such as a cooling tower, a large fan, and even an air conditioner during the process of releasing heat energy to ensure the normal operation of the electronic load, and therefore additional electric energy is needed. For the fuel cell power system for the new energy automobile, the power exceeds 30kW and even reaches 100kW, the electronic load test mode is adopted, so that great electric energy waste is generated, and the test cost is increased.
The second solution is to use a feed-grid type electronic load to feed back the electrical energy output during the fuel cell test to the grid. Although the scheme can effectively avoid the heat consumption of the fuel cell in the test discharging process, due to the complex diversity of the test process (such as frequent start-stop loading, acceleration, test polarization curve and the like) and multi-stack parallel test and the like, when the fuel cell feeds power to the power grid, the high-frequency harmonic interference on the power grid is serious, the power grid is difficult to process, the power quality of the power grid is seriously influenced, and even the impact on the power grid is caused.
The third scheme is that the electric energy output in the test process of the fuel cell is led into the fuel cell to be recycled by obtaining hydrogen through a water electrolysis hydrogen production mode. However, the efficiency of converting hydrogen into electricity in the operation process of the fuel cell is generally 50% (based on the low heating value LHV of hydrogen), and although the theoretical electrolytic efficiency of producing hydrogen by electrolyzing water again by using the generated electricity is very high (the apparent conversion efficiency can even reach 100% -122%), the electric energy conversion efficiency of factors such as heating and temperature rise, generated polarization overpotential and the like which are required for improving the hydrogen production rate in industry is only 50% -70%. The complete cycle efficiency of hydrogen → fuel cell → electrolytic cell → hydrogen is only 30%, the energy loss is over 70%, the energy utilization rate is extremely low, and the cost of the water electrolysis hydrogen production system (especially the solid electrolyte membrane water electrolysis hydrogen production system using noble metal platinum or iridium as catalyst) is high and the service life is short. Therefore, the solution is not economical, and has the problems of complex system and complicated maintenance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a fuel cell testing and lithium ion battery formation capacity-sharing coupling system and method.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a fuel cell testing and lithium ion battery formation capacity-sharing coupling system, which comprises a fuel cell testing unit, an energy storage cell, a lithium ion battery formation capacity-sharing unit, an energy storage bidirectional inverter and an energy management unit, wherein the energy storage cell testing unit is connected with the energy management unit; the energy management unit is respectively in communication connection with the fuel cell testing unit, the energy storage cell, the lithium ion battery formation capacity-dividing unit and the energy storage bidirectional inverter, and the energy storage cell is respectively in electric connection with the fuel cell testing unit, the lithium ion battery formation capacity-dividing unit and the energy storage bidirectional inverter.
In the above scheme, the fuel cell testing unit includes at least one set of fuel cell testing platform and unidirectional DC/DC, the direct current output terminal of the fuel cell to be tested in the fuel cell testing platform is electrically connected to the corresponding input terminal of the unidirectional DC/DC, and the output terminal of the unidirectional DC/DC is electrically connected to one input terminal of the energy storage battery.
In the above scheme, the energy storage battery comprises an energy storage battery pack and a battery management unit, and the energy storage battery pack is connected with the battery management unit BMS through a low-voltage signal line.
In the above scheme, the energy storage battery pack is one or more of a lead-acid battery, a lead-carbon battery, a lithium ion battery, a flow battery, a sodium-sulfur battery, a lithium titanate battery and an all-vanadium liquid flow.
In the above scheme, the lithium ion battery formation capacity-sharing unit includes at least one set of lithium ion battery electrical formation capacity-sharing cabinet and a bidirectional DC/DC, the lithium ion battery electrical formation capacity-sharing cabinet is electrically connected to one end of the bidirectional DC/DC corresponding to the lithium ion battery electrical formation capacity-sharing cabinet, and the other end of the bidirectional DC/DC is electrically connected to one input end of the energy storage battery.
In the above scheme, the energy management unit is connected to the fuel cell test platform and the unidirectional DC/DC in the fuel cell test unit, the battery management unit in the energy storage battery, and the lithium ion battery cellization capacity grading cabinet and the bidirectional DC/DC and energy storage bidirectional inverter in the lithium ion battery cellization capacity grading unit through the CAN lines, and is configured to receive real-time parameter information of the fuel cell test unit, the energy storage battery, and the lithium ion battery cellization capacity grading unit and issue an operation instruction to the control elements of the fuel cell test platform, the unidirectional DC/DC, the battery management unit BMS, the lithium ion battery cellization capacity grading cabinet, the bidirectional DC/DC, and the energy storage bidirectional PCS according to a preset command.
The embodiment of the invention also provides a control method of the fuel cell testing and lithium ion battery formation capacity-sharing coupling system, which is realized by the following steps:
the method comprises the following steps that (1) the energy management unit starts self-checking and confirms that a grid-connected isolating switch of the energy storage bidirectional inverter is in a disconnected state, so that a fuel cell testing and lithium ion battery formation capacity-sharing coupling system enters an initial off-grid control mode;
step (2), the energy management unit acquires fuel to be tested in the fuel cell test platformThe number of the fuel cells and the test parameters and the total quantity of electricity Q generated by the fuel cells in the whole test process are determined1Acquiring the SOC of the energy storage battery pack through the energy storage battery pack and determining the initial charge Q of the energy storage battery pack2And the required electric quantity Q 'when the current SOC is charged to the set SOC upper limit'2Obtaining the capacity model (ampere hours) and the number of the lithium ion battery cells in the lithium ion battery formation and capacity division cabinet so as to calculate the total capacity Q of the lithium ion battery cells needing to be charged in the formation and/or capacity division process3(ii) a Then compare Q1、Q2、Q′2And Q3The size of (A) to (B):
if Q is1≤Q′2And Q is3≤Q1+Q2Entering a steady off-grid working mode;
if Q is1＞Q′2Or Q3＞Q1+Q2And entering a transient grid-connected working mode.
In the above scheme, the steady off-grid operating mode is as follows: the energy management unit sends a starting signal to the fuel cell test platform, carries out electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and simultaneously sends a switch-on instruction to the unidirectional DC/DC corresponding to the fuel cell test platform to output electric energy generated by the fuel cell tested on line on the fuel cell test platform to the energy storage battery pack after DC/DC voltage conversion; the energy management unit sends a starting signal to the lithium ion battery formation and capacity grading cabinet according to the requirement, the lithium ion battery cell entering the formation and capacity grading process is charged and discharged according to preset process step parameter setting and circulation parameter setting, and meanwhile, a switch-on instruction is sent to the bidirectional DC/DC corresponding to the lithium ion battery formation and capacity grading cabinet so that the lithium ion battery cell outputs the electric energy in the energy storage battery pack to the lithium ion battery formation and capacity grading cabinet after DC/DC voltage conversion in the charging process step so as to charge the lithium ion battery cell and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack after DC/DC voltage conversion in the discharging process step; in the whole process of fuel cell testing and lithium ion battery electric core formation and partial capacity, electric energy generated by a fuel cell is only transmitted among the fuel cell testing platform, the energy storage battery pack and the formation and partial capacity cabinet, and a grid-connected isolating switch of the energy storage bidirectional inverter PCS is always in a disconnected state.
In the above scheme, if Q3＜Q2If so, the test of the fuel cell and the chemical composition and partial capacity of the lithium ion battery cell are in a decoupling state; if Q is2≤Q3≤Q1+Q2And the energy management unit EMS adopts a scheduling optimization strategy for carrying out delay operation on the charging steps of one or more groups of lithium ion battery cells of the lithium ion battery formation capacity cabinet according to the real-time monitored state of charge (SOC) of the energy storage battery pack.
In the above scheme, the transient grid-connected operating mode is as follows: the energy management unit sends a starting signal to the fuel cell test platform, carries out electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and simultaneously sends a switch-on instruction to the unidirectional DC/DC corresponding to the fuel cell test platform to output electric energy generated by the fuel cell tested on line on the fuel cell test platform to the energy storage battery pack after DC/DC voltage conversion; the energy management unit sends a starting signal to the lithium ion battery formation and capacity grading cabinet according to the requirement, the lithium ion battery cell entering the formation and capacity grading process is charged and discharged according to preset process step parameter setting and circulation parameter setting, and meanwhile, a switch-on instruction is sent to the bidirectional DC/DC corresponding to the lithium ion battery formation and capacity grading cabinet so that the lithium ion battery cell outputs the electric energy in the energy storage battery pack to the lithium ion battery formation and capacity grading cabinet after DC/DC voltage conversion in the charging process step so as to charge the lithium ion battery cell and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack after DC/DC voltage conversion in the discharging process step; in the processes of fuel cell testing and lithium ion battery cell formation and capacity grading, the energy management unit monitors the state of charge (SOC) of the energy storage battery pack in real time, when the SOC of the energy storage battery pack is monitored to exceed a set SOC upper limit or be lower than a set SOC lower limit, a grid connection instruction is sent to the energy storage bidirectional inverter, when the SOC of the energy storage battery pack exceeds the set SOC upper limit, the electric energy stored by the energy storage battery pack is output to a power grid through an energy storage bidirectional inverter so as to vacate a storage capacity to continuously receive the electric energy generated by a fuel cell under test or/and the electric energy fed back to the energy storage battery pack by the discharge of a lithium ion battery cell, when the SOC of the energy storage battery pack is lower than the set SOC lower limit, the electric energy of the power grid is output to the energy storage battery pack through the energy storage bidirectional inverter to supplement the storage capacity so as to continuously charge the electric core of the lithium ion battery, thereby ensuring the orderly and stable operation of the fuel cell test and the lithium ion battery cell formation and capacity grading process.
In the above aspect, it is characterized by the fact that if Q1＞Q′2And Q3≤Q1+Q2The energy management unit preferentially adopts a scheduling optimization strategy of carrying out delay operation on the test of one group or several groups of fuel cells of a fuel cell test platform to realize the normal electric energy transmission of the whole fuel cell test and the lithium ion battery formation capacity-sharing coupling system, and when the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system can not be guaranteed, and the SOC of the energy storage battery pack is monitored to exceed the set SOC upper limit, a grid-connected instruction is sent to the energy storage bidirectional inverter, and the electric energy stored by the energy storage battery pack is stably output to a power grid through the energy storage bidirectional inverter so as to vacate a storage capacity to continuously receive the electric energy generated by the fuel cell test or/and the electric energy discharged by the lithium ion battery cell and fed back to the energy storage battery pack; if Q is1≤Q′2And Q3＞Q1+Q2The energy management unit preferentially adopts a scheduling optimization strategy for carrying out delay operation on the charging process steps of one or more groups of lithium ion battery cells of the lithium ion battery cellization capacity-sharing cabinet to realize the whole fuel battery test and the normal electric energy transmission of the lithium ion battery cellization capacity-sharing coupling system, and when the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system can not be ensured, and the SOC of the energy storage battery pack is monitored to be lower than the set SOC lower limit, a grid-connected instruction is sent to the energy storage bidirectional inverter, so that the electricity of the power grid is transmittedThe energy storage battery pack can be stably output to supplement the storage capacity so as to continuously charge the lithium ion battery cell; if Q is1＞Q′2And Q3＞Q1+Q2The energy management unit preferentially adopts scheduling optimization strategies such as delay operation and the like for testing one or more groups of fuel cells of a fuel cell testing platform and/or charging and discharging of one or more groups of lithium ion battery cells of a lithium ion battery cellization capacity grading cabinet to realize the normal electric energy transmission of the whole fuel cell testing and lithium ion battery cellization capacity grading coupling system, sends a grid-connection instruction to the energy storage bidirectional inverter when the scheduling optimization strategy is adopted and the normal electric energy transmission of the whole coupling system cannot be guaranteed, and monitors that the SOC of the energy storage battery pack exceeds a set SOC upper limit or is lower than a set SOC lower limit, and stably outputs the electric energy stored by the energy storage battery pack to a power grid through the energy storage bidirectional inverter when the SOC of the energy storage battery pack exceeds the set SOC upper limit so as to vacate a storage capacity to continuously accept the electric energy generated by the fuel cell testing or/and the electric energy discharged from the lithium ion battery cells and fed back to the energy storage battery pack When the SOC of the energy storage battery pack is lower than the set SOC lower limit, the electric energy of the power grid is stably output to the energy storage battery pack through the energy storage bidirectional inverter to supplement the storage capacity for continuously charging the lithium ion battery cell, so that the ordered and stable operation of the fuel cell test and the lithium ion battery cell formation capacity grading process is ensured.
Compared with the prior art, the invention uses the electric energy generated in the electrochemical test process of the fuel cell for the component capacity of the lithium ion battery, thereby avoiding the energy waste caused by the conventional resistance type load consuming the electric energy generated by the fuel cell system through heat energy and simultaneously saving the extra electric energy consumption for the resistance type load cooling equipment; on the other hand, the adoption of the energy storage battery pack realizes the closed circulation of electric energy between the energy storage battery pack and the lithium ion battery under test, thereby avoiding the electric energy waste that the lithium ion battery is charged by taking electricity from a power grid frequently in the formation and grading processes and then discharged in the form of resistance heat energy, and the more the charging and discharging times are, the larger the electric energy waste is. Therefore, the fuel cell testing and lithium ion battery formation capacity-sharing coupling system provided by the invention realizes the high-efficiency utilization of electric energy in the fuel cell testing and lithium ion battery formation capacity-sharing processes, thereby greatly saving the electricity consumption cost.
Drawings
Fig. 1 is a schematic structural diagram of a fuel cell testing and lithium ion battery formation capacitive coupling system according to an embodiment of the present invention.
Fig. 2 is a flowchart of a control method of a fuel cell testing and lithium ion battery formation capacitive coupling system according to an embodiment of the present invention.
Detailed Description
The advantages and features of the present invention will become more apparent from the following description of the embodiments of the invention with reference to the accompanying drawings. The embodiments are merely exemplary and do not limit the scope of the invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
The embodiment of the invention provides a fuel cell testing and lithium ion battery formation capacity-sharing coupling system, as shown in fig. 1, which comprises a fuel cell testing unit 1, an energy storage cell 2, a lithium ion battery formation capacity-sharing unit 3, an energy storage bidirectional inverter (PCS)4 and an energy management unit (EMS) 5; the energy management unit 5 is respectively in communication connection with the fuel cell testing unit 1, the energy storage cell 2, the lithium ion battery formation capacity-dividing unit 3 and the energy storage bidirectional inverter 4, and the energy storage cell 2 is respectively in electric connection with the fuel cell testing unit 1, the lithium ion battery formation capacity-dividing unit 3 and the energy storage bidirectional inverter 4;
specifically, the fuel cell testing unit 1 includes a fuel cell testing platform 11 and a unidirectional DC/DC12, a direct current output terminal of a fuel cell to be tested in the fuel cell testing platform 11 is electrically connected to a corresponding input terminal of the unidirectional DC/DC12, and an output terminal of the unidirectional DC/DC12 is electrically connected to one input terminal of the energy storage cell 2.
The fuel cell testing platform 11 in the fuel cell testing unit 1 is used for testing and evaluating the polarization curve, Electrochemical Impedance Spectroscopy (EIS) and electrochemical performance under various simulated working conditions of the fuel cell, and the unidirectional DC/DC12 outputs the electric energy generated by the fuel cell in the testing process to the energy storage cell 2 after voltage conversion.
Furthermore, the fuel cell test platform 11 in the fuel cell test unit 1 may be a single platform or multiple platforms, so as to form a fuel cell test platform array, and each fuel cell test platform in the fuel cell test platform array works independently without interfering with each other; the number of the unidirectional DC/DC12 and the number of the fuel cell test platforms 11 are consistent and form a one-to-one correspondence;
optionally, the fuel cell testing platform 11 includes, but is not limited to, a hydrogen flow testing unit, an air flow testing unit, a water management unit, a thermal management unit, and a control unit, and the tested fuel cells include, but are not limited to, single fuel cells, fuel cell stacks, fuel cell systems, fuel cell engines, and the like; moreover, different fuel cells have different configurations of corresponding fuel cell test platforms, as long as the types and test parameters of the tested fuel cells are matched with the fuel cell test platforms. Similarly, the unidirectional DC/DC12 corresponding to the fuel cell testing platform will also have different configuration parameters according to the voltage and current of the fuel cell to be tested, as long as the convertible voltage and current intervals match the voltage and current output by the fuel cell. In other words, the fuel cell test platforms 11 in the fuel cell test platform array may be of the same type or different types; correspondingly, the unidirectional DC/DC12 may be of the same type or of different types, but the input configuration parameters of each unidirectional DC/DC must be matched to the electrical output parameters of the fuel cell test platform to which it is connected, and the output configuration parameters must be matched to the charging parameters of the energy storage cell 2.
Specifically, the energy storage battery 2 comprises an energy storage battery pack 21 and a battery management unit BMS22, and the energy storage battery pack 21 and the battery management unit BMS22 are connected through a low-voltage signal line.
The energy storage battery pack 21 is configured to receive direct-current electric energy generated by the fuel cell during the test process and transmitted by the unidirectional DC/DC12 in the fuel cell test unit 1, and perform bidirectional electric energy transmission with the lithium ion battery formation capacity-sharing unit 3 and the power grid respectively;
optionally, the energy storage battery pack 21 is one or more of a lead-acid battery, a lead-carbon battery, a lithium ion battery, a flow battery, and a sodium-sulfur battery; preferably, the energy storage battery pack 21 preferably adopts a lithium titanate battery or an all-vanadium redox flow battery.
The battery management unit BMS22 is configured to monitor the voltage, the current, and the temperature of the energy storage battery pack 21, accurately estimate the state of charge SOC of the energy storage battery pack 21, transmit data information acquired in real time to the energy management unit 5 through a CAN line, and perform energy balance between the individual batteries of the energy storage battery pack 21.
Specifically, the lithium ion battery formation and capacity division unit 3 includes a lithium ion battery electrical core formation and capacity division cabinet 31 and a bidirectional DC/DC32, the lithium ion battery electrical core formation and capacity division cabinet 31 is electrically connected with one end of the corresponding bidirectional DC/DC32, and the other end of the bidirectional DC/DC32 is electrically connected with one input end of the energy storage battery 2.
The lithium ion battery electric core formation capacity grading cabinet 31 in the lithium ion battery formation capacity grading unit 3 is used for charging and discharging the lithium ion battery electric core entering the formation capacity grading process through bidirectional energy transfer with the energy storage battery 2; the bidirectional DC/DC32 is configured to implement bidirectional energy transfer between the energy storage battery 2 and the lithium ion battery electric core component and capacitor cabinet 31 through conversion of direct-current voltage, and the number of the bidirectional DC/DC32 and the number of the lithium ion battery electric core component and capacitor cabinet 31 are consistent and form a one-to-one correspondence relationship.
Further, the lithium ion battery electric core formation grading cabinet 31 may be a single unit, or may be a plurality of units, so as to form a lithium ion battery electric core formation grading cabinet array; moreover, each lithium ion battery electric core formation grading cabinet 31 in the lithium ion battery electric core formation grading cabinet array works independently without mutual interference.
Optionally, in the lithium ion battery electric core formation and grading cabinet array, according to the difference in the types and capacities (ampere hours) of the lithium ion battery electric cores entering the formation and grading process, the specific parameter configurations of the corresponding lithium ion battery electric core formation and grading cabinets 31 are also different, as long as the configurations are matched with the process step parameters of the lithium ion battery electric cores needing formation and grading; similarly, the bidirectional DC/DC32 corresponding to the lithium ion battery cell component capacity cabinet 31 may also have different configuration parameters according to different voltages and currents of the lithium ion battery cells requiring component capacity, as long as the convertible voltage and current intervals are matched with the charging and discharging voltages and currents of the lithium ion battery cells. In other words, the lithium ion battery electrical core formation capacity grading cabinets 31 in the lithium ion battery electrical core formation capacity grading cabinet array may be of the same type or of different types; correspondingly, the bidirectional DC/DC32 may be of the same type or of different types, but configuration parameters at two ends of each bidirectional DC/DC32 must be respectively matched with input and output parameters of the lithium ion battery electrical component capacitor box connected thereto and charge and discharge parameters of the energy storage battery 2.
Specifically, the dc end of the energy storage bidirectional inverter 4 is electrically connected to the energy storage battery 2, and the ac end thereof is electrically connected to the power grid, so as to realize bidirectional energy transfer between the energy storage battery pack and the ac power grid through ac/dc conversion under specific conditions.
Specifically, the energy management unit 5 is connected to the fuel cell testing platform 11 and the unidirectional DC/DC12 in the fuel cell testing unit 1, the battery management unit BMS22 in the energy storage battery 2, the lithium ion battery electric chemical composition grading cabinet 31 and the bidirectional DC/DC32 in the lithium ion battery chemical composition grading unit 3, and the energy storage bidirectional inverter 4 through CAN lines, the system is used for receiving the real-time parameter information of the fuel cell testing unit 1, the energy storage cell 2 and the lithium ion battery formation capacity-sharing unit 3 and issuing an operation instruction to the control elements of the fuel cell testing platform 11, the unidirectional DC/DC12, the battery management unit BMS22, the lithium ion battery formation capacity-sharing cabinet 31, the bidirectional DC/DC32 and the energy storage bidirectional inverter 4 according to a preset command, and managing and scheduling the energy of the whole fuel cell test and lithium ion battery formation capacity-sharing coupling system to maintain the normal operation of the whole system.
The energy management unit 5 works in a steady-state off-grid working mode and a transient grid-connected working mode:
in a steady off-grid working mode, the energy management unit 5 sends a starting signal to the fuel cell test platform 11 in the fuel cell test unit 1, performs electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and sends a switch-on instruction to the unidirectional DC/DC12 corresponding to the fuel cell test platform 11 to output electric energy generated by the fuel cell in online test on the fuel cell test platform 11 to the energy storage battery pack 21 in the energy storage cell 2 after DC/DC voltage conversion; and the energy management unit 5 sends a start signal to the lithium ion battery cell formation and capacity grading cabinet 31 in the lithium ion battery formation and capacity grading unit 3 according to the requirement, charges and discharges the lithium ion battery cell entering the formation and capacity grading process according to preset process step parameters and cycle parameters, and sends a switch-on instruction to the bidirectional DC/DC32 corresponding to the lithium ion battery cell formation and capacity grading cabinet 31 to realize that the lithium ion battery cell outputs the electric energy in the energy storage battery pack 21 to the lithium ion battery cell formation and capacity grading cabinet 31 to charge the lithium ion battery cell after DC/DC voltage conversion in the charging process step and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack 21 after DC/DC voltage conversion in the discharging process step. In the whole process of fuel cell testing and lithium ion battery cell formation and capacity division, electric energy generated by the fuel cell is only transmitted among the fuel cell testing unit 1, the energy storage cell 2 and the lithium ion battery formation and capacity division unit 3, and a grid-connected isolating switch of the energy storage bidirectional inverter 4 is always in a disconnected state.
In the transient grid-connected mode, the energy management unit 5 sends a start signal to the fuel cell test platform 11 in the fuel cell test unit 1, performs an electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and sends a switch-on instruction to the unidirectional DC/DC12 corresponding to the fuel cell test platform 11 to output the electric energy generated by the fuel cell tested on line on the fuel cell test platform 11 to the energy storage battery pack 21 in the energy storage cell 2 after DC/DC voltage conversion; and the energy management unit 5 sends a start signal to the lithium ion battery cell formation and capacity grading cabinet 31 in the lithium ion battery formation and capacity grading unit 3 according to the requirement, charges and discharges the lithium ion battery cell entering the formation and capacity grading process according to preset process step parameters and cycle parameters, and sends a switch-on instruction to the bidirectional DC/DC32 corresponding to the lithium ion battery cell formation and capacity grading cabinet 31 to realize that the lithium ion battery cell outputs the electric energy in the energy storage battery pack 21 to the lithium ion battery cell formation and capacity grading cabinet 31 to charge the lithium ion battery cell after DC/DC voltage conversion in the charging process step and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack 21 after DC/DC voltage conversion in the discharging process step.
Meanwhile, the energy management unit 5 monitors the state of charge (SOC) of the energy storage battery pack 21 in real time, and preferably adopts scheduling optimization strategies such as delay operation for testing one or more groups of fuel cells of the fuel cell testing platform 11 and/or charging and discharging of one or more groups of lithium ion battery cells of the lithium ion battery cell formation capacity grading cabinet 31 to realize normal electric energy transmission of the whole fuel cell testing and lithium ion battery formation capacity grading coupling system. When the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system still cannot be guaranteed, and the SOC of the energy storage battery pack 21 is monitored to exceed the set SOC upper limit or be lower than the set SOC lower limit, a grid connection instruction is sent to the energy storage bidirectional inverter 4, the energy storage bidirectional inverter 4 starts to track the phase of the power grid side, after the phase tracking is completed, a grid connection closing instruction is immediately issued, and the corresponding execution switch closes to complete grid connection; when the state of charge (SOC) of the energy storage battery pack 21 exceeds the set SOC upper limit, the electric energy stored in the energy storage battery pack 21 is regulated to be voltage amplitude, frequency and phase matched with the voltage of the power grid through the energy storage bidirectional inverter 4 through DC/AC inversion and then is stably output to the power grid, so that the storage capacity is vacated to continuously receive the electric energy generated by a tested fuel cell or/and the electric energy fed back to the energy storage battery pack 21 by the discharge of a lithium ion battery cell, when the state of charge (SOC) of the energy storage battery pack 21 is lower than the set SOC lower limit, the electric energy of the power grid is regulated to direct current voltage matched with the charging voltage of the energy storage battery pack 21 through AC/DC inversion by the energy storage bidirectional inverter 4 and then is stably output to the energy storage battery pack 21 to supplement the storage capacity so as to continuously charge the lithium ion battery cell, thereby ensuring the orderly and stable operation of the fuel cell test and the lithium ion battery cell formation and capacity grading process.
The invention uses the electric energy generated in the electrochemical test process of the fuel cell for the component capacity of the lithium ion battery, thereby avoiding the energy waste caused by the consumption of the electric energy generated by the fuel cell system through heat energy by the conventional resistive load and saving the extra electric energy consumption for the resistive load cooling equipment; on the other hand, the adoption of the energy storage battery pack realizes the closed circulation of electric energy between the energy storage battery pack and the lithium ion battery under test, thereby avoiding the electric energy waste that the lithium ion battery is charged by taking electricity from a power grid frequently in the formation and grading processes and then discharged in the form of resistance heat energy, and the more the charging and discharging times are, the larger the electric energy waste is. Therefore, the fuel cell testing and lithium ion battery formation capacity-sharing coupling system provided by the invention realizes the high-efficiency utilization of electric energy in the fuel cell testing and lithium ion battery formation capacity-sharing processes, thereby greatly saving the electricity consumption cost.
In addition, when power needs to be transmitted to a power grid under extreme conditions, the coupling system provided by the invention can avoid the serious interference of common feed network type electronic loads on the high-frequency harmonic waves of the power grid due to the adoption of the energy storage battery pack, thereby ensuring the power quality of the power grid; on the other hand, peak clipping and valley filling, harmonic wave treatment and reactive compensation of the power grid can be realized, and the power quality of the power grid is improved; meanwhile, the energy storage battery pack can bring extra benefits to enterprises through power auxiliary services such as valley power peak use, peak regulation, frequency modulation and the like.
The embodiment of the invention also provides a fuel cell test and lithium ion battery formation capacity-sharing coupling system control method, as shown in fig. 2, the method is realized by the following steps:
in step 200, the energy management unit 5 starts a self-check and confirms that the grid-connected isolating switch of the energy storage bidirectional inverter 4 is in a disconnected state, so that the fuel cell test and lithium ion battery formation capacitance-sharing coupling system enters an initial grid-disconnection control mode. Step 201 is then entered.
In step 201, the energy management unit 5 obtains the number of the fuel cells to be tested in the fuel cell testing unit 1 and the testing parameters so as to calculate the total electric quantity Q generated by the fuel cells in the whole testing process1The initial charge Q of the energy storage battery pack 21 is calculated by acquiring the SOC of the energy storage battery pack 21 through a battery management unit BMS22 in the energy storage battery 22And the required electric quantity Q 'when the current SOC is charged to the set SOC upper limit'2The capacity model (i.e. ampere hours) and number of the lithium ion battery cells in the lithium ion battery formation and capacity division unit 3 are obtained to calculate the total capacity Q of the lithium ion battery cells to be charged in the formation and/or capacity division process3(ii) a Then compare Q1、Q2、Q′2And Q3And proceeds to step 202.
In step 202, when the energy management unit 5 detects Q1≤Q′2And Q3≤Q1+Q2If yes, go to step 210, namely, go to the steady state off-grid working mode; when Q is detected1＞Q′2Or Q3＞Q1+Q2If yes, go to step 220, i.e. go to the transient grid-connected operation mode.
In step 210, the energy management unit 5 sends a start signal to the fuel cell test platform 11 in the fuel cell test unit 1, performs an electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and sends a switch-on instruction to the unidirectional DC/DC12 corresponding to the fuel cell test platform 11 to output the electric energy generated by the fuel cell in the on-line test on the fuel cell test platform 11 to the energy storage battery pack 21 in the energy storage cell 2 after DC/DC voltage conversion; and the energy management unit 5 sends a start signal to the lithium ion battery cell formation and capacity grading cabinet 31 in the lithium ion battery formation and capacity grading unit 3 according to the requirement, charges and discharges the lithium ion battery cell entering the formation and capacity grading process according to preset process step parameters and cycle parameters, and sends a switch-on instruction to the bidirectional DC/DC32 corresponding to the lithium ion battery cell formation and capacity grading cabinet 31 to realize that the lithium ion battery cell outputs the electric energy in the energy storage battery pack 21 to the lithium ion battery cell formation and capacity grading cabinet 31 to charge the lithium ion battery cell after DC/DC voltage conversion in the charging process step and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack 21 after DC/DC voltage conversion in the discharging process step. In the whole process of fuel cell testing and lithium ion battery cell formation and capacity division, electric energy generated by the fuel cell is only transmitted among the fuel cell testing unit 1, the energy storage cell 2 and the lithium ion battery formation and capacity division unit 3, and a grid-connected isolating switch of the energy storage bidirectional inverter 4 is always in a disconnected state.
At the same time, the energy management unit 5 compares Q3And Q2And proceeds to step 211.
In step 211, the energy management unit 5 starts detecting Q3Whether or not less than Q2: if so, step 212 is entered, and if not, step 213 is entered.
In step 212, the fuel cell test and the formation capacity of the lithium ion battery cell are decoupled, and may be performed simultaneously or in time-sharing manner without interfering with each other.
In step 213, the energy management unit 5 starts detecting the presence of Q2≤Q3≤Q1+Q2The case (2) is as follows: if so, step 214 is entered, and if not, step 211 is returned to.
In step 214, the energy management unit 5 monitors the state of charge SOC of the energy storage battery pack 21 in real time. And if the SOC is close to the preset SOC lower limit, adopting a scheduling optimization strategy of carrying out appropriate time delay operation on the charging process steps of one or more groups of lithium ion battery cells of the lithium ion battery formation capacity-sharing cabinet so as to realize the normal electric energy transmission of the whole fuel battery test and the lithium ion battery formation capacity-sharing coupling system.
In step 220, the energy management unit 5 sends a start signal to the fuel cell test platform 11 in the fuel cell test unit 1, performs an electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and sends a switch-on instruction to the unidirectional DC/DC12 corresponding to the fuel cell test platform 11 to output the electric energy generated by the fuel cell in the on-line test on the fuel cell test platform 11 to the energy storage battery pack 21 in the energy storage cell 2 after DC/DC voltage conversion; and the energy management unit 5 sends a start signal to the lithium ion battery cell formation and capacity grading cabinet 31 in the lithium ion battery formation and capacity grading unit 3 according to the requirement, charges and discharges the lithium ion battery cell entering the formation and capacity grading process according to preset process step parameters and cycle parameters, and sends a switch-on instruction to the bidirectional DC/DC32 corresponding to the lithium ion battery cell formation and capacity grading cabinet 31 to realize that the lithium ion battery cell outputs the electric energy in the energy storage battery pack 21 to the lithium ion battery cell formation and capacity grading cabinet 31 to charge the lithium ion battery cell after DC/DC voltage conversion in the charging process step and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack 21 after DC/DC voltage conversion in the discharging process step.
At the same time, the energy management unit 5 starts retrieving at Q1＞Q′2Or Q3＞Q1+Q2On the premise of Q1And Q'2And Q3And Q1+Q2The combination form existing in between, and proceeds to step 221.
In step 221, the energy management unit 5 starts detecting whether Q is present1＞Q′2And Q3≤Q1+Q2The case (2) is as follows: if so, proceed to step 222, if not, thenStep 223 is entered.
In step 222, the energy management unit 5 monitors the state of charge SOC of the energy storage battery pack 21 in real time, and preferably adopts a scheduling optimization strategy of performing a delay operation on the test of one or more fuel cells of the fuel cell test platform 11 to implement the normal electric energy transfer between the whole fuel cell test and the lithium ion battery formation capacity-sharing coupling system. When the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system still cannot be guaranteed, and the SOC of the energy storage battery pack 21 is monitored to exceed the set SOC upper limit, a grid connection instruction is sent to the energy storage bidirectional inverter 4, the energy storage bidirectional inverter 4 starts to track the phase of the power grid side, when the phase tracking is finished, a grid-connected switching-on command is immediately issued, the corresponding execution switch is switched on to finish grid connection, the electric energy stored in the energy storage battery pack 21 is regulated into the voltage amplitude, the frequency and the phase which are matched with the voltage of the power grid through the energy storage bidirectional inverter 4 through DC/AC inversion, and then is stably output to the power grid, so that the storage capacity is vacated to continuously receive the electric energy generated by the fuel cell to be tested or/and the electric energy which is fed back to the energy storage battery pack 21 by the discharge of the lithium ion battery cell, thereby ensuring the orderly and stable operation of the fuel cell test and the lithium ion battery cell formation and capacity grading process.
In step 223, the energy management unit 5 starts detecting whether Q is present1≤Q′2And Q3＞Q1+Q2The case (2) is as follows: if so, step 224 is entered, and if not, step 225 is entered.
In step 224, the energy management unit 5 monitors the state of charge SOC of the energy storage battery pack 21 in real time, and preferably adopts a scheduling optimization strategy of performing a delay operation on the charging process of one or more groups of lithium ion battery cells of the lithium ion battery cell formation capacity-sharing cabinet 31 to implement the whole fuel cell test and the normal electric energy transfer of the lithium ion battery formation capacity-sharing coupling system. When the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system still cannot be guaranteed, and the SOC of the energy storage battery pack 21 is monitored to be lower than the set SOC lower limit, a grid-connected instruction is sent to the energy storage bidirectional inverter 4, the energy storage bidirectional inverter 4 starts to track the phase of the power grid side, after the phase tracking is completed, a grid-connected switch-on command is immediately issued, the corresponding execution switch is switched on to complete grid connection, the electric energy of the power grid is adjusted to be direct current voltage matched with the charging voltage of the energy storage battery pack 21 through the energy storage bidirectional inverter 4 through AC/DC inversion, then the electric energy is stably output to the energy storage battery pack 21 to supplement the storage capacity so as to continuously charge the lithium ion battery cell, and therefore the ordered and stable operation of the fuel.
In step 225, the energy management unit 5 starts detecting the presence of Q1＞Q′2And Q3＞Q1+Q2The case (2) is as follows: if so, go to step 226, and if not, go back to step 221.
In step 226, the energy management unit 5 monitors the state of charge SOC of the energy storage battery pack 21 in real time, and preferably adopts scheduling optimization strategies such as performing delay operations on the tests of one or more groups of fuel cells of the fuel cell test platform 11 and/or the charging and discharging of one or more groups of lithium ion battery cells of the lithium ion battery cell formation and capacity grading cabinet 31 to implement normal electric energy transfer of the whole fuel cell test and lithium ion battery formation and capacity grading coupling system. When the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system still cannot be guaranteed, and the SOC of the energy storage battery pack 21 is monitored to exceed the set SOC upper limit or be lower than the set SOC lower limit, a grid connection instruction is sent to the energy storage bidirectional inverter 4, the energy storage bidirectional inverter 4 starts to track the phase of the power grid side, after the phase tracking is completed, a grid connection closing instruction is immediately issued, and the corresponding execution switch closes to complete grid connection; when the state of charge (SOC) of the energy storage battery pack 21 exceeds the set SOC upper limit, the electric energy stored in the energy storage battery pack 21 is regulated to be voltage amplitude, frequency and phase matched with the voltage of the power grid through the energy storage bidirectional inverter 4 through DC/AC inversion and then is stably output to the power grid, so that the storage capacity is vacated to continuously receive the electric energy generated by a tested fuel cell or/and the electric energy fed back to the energy storage battery pack 21 by the discharge of a lithium ion battery cell, when the state of charge (SOC) of the energy storage battery pack 21 is lower than the set SOC lower limit, the electric energy of the power grid is regulated to direct current voltage matched with the charging voltage of the energy storage battery pack 21 through AC/DC inversion by the energy storage bidirectional inverter 4 and then is stably output to the energy storage battery pack 21 to supplement the storage capacity so as to continuously charge the lithium ion battery cell, thereby ensuring the orderly and stable operation of the fuel cell test and the lithium ion battery cell formation and capacity grading process.
The embodiments of the present invention are disclosed in the above, but the embodiments are not intended to limit the scope of the invention, and simple equivalent changes and modifications made according to the claims and the description of the invention are still within the scope of the technical solution of the present invention.
Claims (11)
1. A fuel cell testing and lithium ion battery formation capacity-sharing coupling system is characterized by comprising a fuel cell testing unit, an energy storage cell, a lithium ion battery formation capacity-sharing unit, an energy storage bidirectional inverter and an energy management unit; the energy management unit is respectively in communication connection with the fuel cell testing unit, the energy storage cell, the lithium ion battery formation capacity-dividing unit and the energy storage bidirectional inverter, and the energy storage cell is respectively in electric connection with the fuel cell testing unit, the lithium ion battery formation capacity-dividing unit and the energy storage bidirectional inverter.
2. The fuel cell testing and lithium ion battery formation capacity-sharing coupling system of claim 1, wherein the fuel cell testing unit comprises at least one set of fuel cell testing platform and unidirectional DC/DC, the direct current output terminal of the fuel cell to be tested in the fuel cell testing platform is electrically connected with the corresponding input terminal of the unidirectional DC/DC, and the output terminal of the unidirectional DC/DC is electrically connected with one input terminal of the energy storage battery.
3. The fuel cell testing and lithium ion battery formation capacity-sharing coupling system according to claim 1 or 2, wherein the energy storage battery comprises an energy storage battery pack and a battery management unit (BMS), and the energy storage battery pack and the BMS are connected through a low-voltage signal line.
4. The fuel cell testing and lithium ion battery formation capacity coupling system of claim 3, wherein the energy storage battery pack adopts one or more of a lead-acid battery, a lead-carbon battery, a lithium ion battery, a flow battery, a sodium-sulfur battery, a lithium titanate battery, and an all-vanadium liquid flow.
5. The fuel cell testing and lithium ion battery formation and capacity-sharing coupling system according to claim 4, wherein the lithium ion battery formation and capacity-sharing unit comprises at least one set of lithium ion battery formation and capacity-sharing cabinets and a bidirectional DC/DC, the lithium ion battery formation and capacity-sharing cabinets are electrically connected with one corresponding end of the bidirectional DC/DC, and the other end of the bidirectional DC/DC is electrically connected with one input end of the energy storage battery.
6. The fuel cell testing and lithium ion battery formation capacitive coupling system of claim 5, it is characterized in that the energy management unit is respectively connected with a fuel cell test platform and a unidirectional DC/DC in the fuel cell test unit, a battery management unit in the energy storage battery, a lithium ion battery electric core formation capacity grading cabinet and a bidirectional DC/DC in the lithium ion battery formation capacity grading unit and an energy storage bidirectional inverter through CAN lines, and the system is used for receiving the real-time parameter information of the fuel cell testing unit, the energy storage cell and the lithium ion battery formation capacity-sharing unit and issuing an operation instruction to the control elements of the fuel cell testing platform, the unidirectional DC/DC, the battery management unit BMS, the lithium ion battery formation capacity-sharing cabinet, the bidirectional DC/DC and the energy storage bidirectional inverter PCS according to a preset command.
7. A control method for a fuel cell test and lithium ion battery formation capacity-sharing coupling system is characterized by comprising the following steps:
the method comprises the following steps that (1) the energy management unit starts self-checking and confirms that a grid-connected isolating switch of the energy storage bidirectional inverter is in a disconnected state, so that a fuel cell testing and lithium ion battery formation capacity-sharing coupling system enters an initial off-grid control mode;
step (2), the energy management sheetThe unit obtains the number and test parameters of the fuel cells to be tested in the fuel cell test platform and determines the total electric quantity Q generated by the fuel cells in the whole test process1Acquiring the SOC of the energy storage battery pack through the energy storage battery pack and determining the initial charge Q of the energy storage battery pack2And the required electric quantity Q 'when the current SOC is charged to the set SOC upper limit'2Obtaining the capacity model (ampere hours) and the number of the lithium ion battery cells in the lithium ion battery formation and capacity division cabinet so as to calculate the total capacity Q of the lithium ion battery cells needing to be charged in the formation and/or capacity division process3(ii) a Then compare Q1、Q2、Q′2And Q3The size of (A) to (B):
if Q is1≤Q′2And Q is3≤Q1+Q2Entering a steady off-grid working mode;
if Q is1＞Q′2Or Q3＞Q1+Q2And entering a transient grid-connected working mode.
8. The method for controlling the fuel cell testing and lithium ion battery formation capacity-sharing coupling system according to claim 7, wherein the steady-state off-grid operation mode is as follows: the energy management unit sends a starting signal to the fuel cell test platform, carries out electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and simultaneously sends a switch-on instruction to the unidirectional DC/DC corresponding to the fuel cell test platform to output electric energy generated by the fuel cell tested on line on the fuel cell test platform to the energy storage battery pack after DC/DC voltage conversion; the energy management unit sends a starting signal to the lithium ion battery formation and capacity grading cabinet according to the requirement, the lithium ion battery cell entering the formation and capacity grading process is charged and discharged according to preset process step parameter setting and circulation parameter setting, and meanwhile, a switch-on instruction is sent to the bidirectional DC/DC corresponding to the lithium ion battery formation and capacity grading cabinet so that the lithium ion battery cell outputs the electric energy in the energy storage battery pack to the lithium ion battery formation and capacity grading cabinet after DC/DC voltage conversion in the charging process step so as to charge the lithium ion battery cell and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack after DC/DC voltage conversion in the discharging process step; in the whole process of fuel cell testing and lithium ion battery electric core formation and partial capacity, electric energy generated by a fuel cell is only transmitted among the fuel cell testing platform, the energy storage battery pack and the formation and partial capacity cabinet, and a grid-connected isolating switch of the energy storage bidirectional inverter PCS is always in a disconnected state.
9. The method of claim 8 wherein Q is Q, the number of the cells in the lithium ion battery is Q, and Q is Q3＜Q2If so, the test of the fuel cell and the chemical composition and partial capacity of the lithium ion battery cell are in a decoupling state; if Q is2≤Q3≤Q1+Q2And the energy management unit EMS adopts a scheduling optimization strategy for carrying out delay operation on the charging steps of one or more groups of lithium ion battery cells of the lithium ion battery formation capacity cabinet according to the real-time monitored state of charge (SOC) of the energy storage battery pack.
10. The method for controlling the fuel cell testing and lithium ion battery formation capacity-sharing coupling system according to claim 7, wherein the transient grid-connection operation mode is as follows: the energy management unit sends a starting signal to the fuel cell test platform, carries out electrochemical performance test on the fuel cell to be tested according to preset parameters and process steps, and simultaneously sends a switch-on instruction to the unidirectional DC/DC corresponding to the fuel cell test platform to output electric energy generated by the fuel cell tested on line on the fuel cell test platform to the energy storage battery pack after DC/DC voltage conversion; the energy management unit sends a starting signal to the lithium ion battery formation and capacity grading cabinet according to the requirement, the lithium ion battery cell entering the formation and capacity grading process is charged and discharged according to preset process step parameter setting and circulation parameter setting, and meanwhile, a switch-on instruction is sent to the bidirectional DC/DC corresponding to the lithium ion battery formation and capacity grading cabinet so that the lithium ion battery cell outputs the electric energy in the energy storage battery pack to the lithium ion battery formation and capacity grading cabinet after DC/DC voltage conversion in the charging process step so as to charge the lithium ion battery cell and outputs the electric energy stored in the lithium ion battery cell to the energy storage battery pack after DC/DC voltage conversion in the discharging process step; in the processes of fuel cell testing and lithium ion battery cell formation and capacity grading, the energy management unit monitors the state of charge (SOC) of the energy storage battery pack in real time, when the SOC of the energy storage battery pack is monitored to exceed a set SOC upper limit or be lower than a set SOC lower limit, a grid connection instruction is sent to the energy storage bidirectional inverter, when the SOC of the energy storage battery pack exceeds the set SOC upper limit, the electric energy stored by the energy storage battery pack is output to a power grid through an energy storage bidirectional inverter so as to vacate a storage capacity to continuously receive the electric energy generated by a fuel cell under test or/and the electric energy fed back to the energy storage battery pack by the discharge of a lithium ion battery cell, when the SOC of the energy storage battery pack is lower than the set SOC lower limit, the electric energy of the power grid is output to the energy storage battery pack through the energy storage bidirectional inverter to supplement the storage capacity so as to continuously charge the electric core of the lithium ion battery, thereby ensuring the orderly and stable operation of the fuel cell test and the lithium ion battery cell formation and capacity grading process.
11. The method of claim 10 wherein Q is the number of cells in the fuel cell system that are tested and lithium ion batteries are combined into a capacitive coupling system1＞Q′2And Q3≤Q1+Q2The energy management unit preferentially adopts a scheduling optimization strategy for carrying out delay operation on testing of one or more groups of fuel cells of a fuel cell testing platform to realize normal electric energy transmission of the whole fuel cell testing and lithium ion battery formation capacity-sharing coupling system, and when the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system can not be guaranteed, and the SOC of the energy storage battery pack exceeds the set SOC upper limit, a grid-connected instruction is sent to the energy storage bidirectional inverter, and the electric energy stored by the energy storage battery pack is stably output to a power grid through the energy storage bidirectional inverter so as to vacate a storage capacity to continuously accommodate the capacity generated by the tested fuel cellsThe generated electric energy or/and the electric energy discharged by the lithium ion battery cell and fed back to the energy storage battery pack; if Q is1≤Q′2And Q3＞Q1+Q2The energy management unit preferentially adopts a scheduling optimization strategy of carrying out delay operation on the charging process steps of one or more groups of lithium ion battery cells of the lithium ion battery cellization capacity-sharing cabinet to realize the whole fuel battery test and the normal electric energy transmission of the lithium ion battery cellization capacity-sharing coupling system, and when the scheduling optimization strategy is adopted, the normal electric energy transmission of the whole coupling system can not be ensured, and the SOC of the energy storage battery pack is monitored to be lower than the set SOC lower limit, a grid-connection instruction is sent to the energy storage bidirectional inverter, and the electric energy of a power grid is stably output to the energy storage battery pack to supplement the storage capacity so as to continuously charge the lithium ion battery cells; if Q is1＞Q′2And Q3＞Q1+Q2The energy management unit preferentially adopts scheduling optimization strategies such as delay operation and the like for testing one or more groups of fuel cells of a fuel cell testing platform and/or charging and discharging of one or more groups of lithium ion battery cells of a lithium ion battery cellization capacity grading cabinet to realize the normal electric energy transmission of the whole fuel cell testing and lithium ion battery cellization capacity grading coupling system, sends a grid-connection instruction to the energy storage bidirectional inverter when the scheduling optimization strategy is adopted and the normal electric energy transmission of the whole coupling system cannot be guaranteed, and monitors that the SOC of the energy storage battery pack exceeds a set SOC upper limit or is lower than a set SOC lower limit, and stably outputs the electric energy stored by the energy storage battery pack to a power grid through the energy storage bidirectional inverter when the SOC of the energy storage battery pack exceeds the set SOC upper limit so as to vacate a storage capacity to continuously accept the electric energy generated by the fuel cell testing or/and the electric energy discharged from the lithium ion battery cells and fed back to the energy storage battery pack When the SOC of the energy storage battery pack is lower than the set SOC lower limit, the electric energy of the power grid is stably output to the energy storage battery pack through the energy storage bidirectional inverter to supplement the storage capacity for continuously charging the lithium ion battery cell, so that the ordered and stable operation of the fuel cell test and the lithium ion battery cell formation capacity grading process is ensured.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345951A (en) * | 2020-11-19 | 2021-02-09 | 同济大学 | Alternating current impedance measurement method for battery in composite power supply power system |
| CN115085278A (en) * | 2022-08-23 | 2022-09-20 | 深圳市南科动力科技有限公司 | Hydrogen fuel cell power generation system and power generation method thereof |
| CN116359763A (en) * | 2023-06-01 | 2023-06-30 | 深圳和润达科技有限公司 | Intelligent analysis method and device for chemical component capacity energy consumption |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345951A (en) * | 2020-11-19 | 2021-02-09 | 同济大学 | Alternating current impedance measurement method for battery in composite power supply power system |
| CN115085278A (en) * | 2022-08-23 | 2022-09-20 | 深圳市南科动力科技有限公司 | Hydrogen fuel cell power generation system and power generation method thereof |
| CN116359763A (en) * | 2023-06-01 | 2023-06-30 | 深圳和润达科技有限公司 | Intelligent analysis method and device for chemical component capacity energy consumption |
| CN116359763B (en) * | 2023-06-01 | 2023-08-04 | 深圳和润达科技有限公司 | Intelligent analysis method and device for chemical component capacity energy consumption |
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