CN110061316B - Energy storage battery charging and discharging management method and device and charging and discharging manager - Google Patents
Energy storage battery charging and discharging management method and device and charging and discharging manager Download PDFInfo
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- CN110061316B CN110061316B CN201910480128.5A CN201910480128A CN110061316B CN 110061316 B CN110061316 B CN 110061316B CN 201910480128 A CN201910480128 A CN 201910480128A CN 110061316 B CN110061316 B CN 110061316B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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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Abstract
The invention provides a charging and discharging management method, a charging and discharging management device and a charging and discharging manager for a battery for energy storage, which relate to the technical field of energy storage of lithium ion batteries, and the method comprises the following steps: monitoring the voltage of a single battery when the battery for energy storage runs; judging whether the voltage of the single battery exceeds a preset voltage range or not; if the charging and discharging control is carried out, the working power is reduced, the charging and discharging control is carried out on the energy storage battery by adopting the reduced working power, the problem that the charging and discharging efficiency is reduced due to the adoption of a constant current mode in the charging and discharging process of the lithium ion battery in the prior art is solved, and meanwhile, the overcharge and the overdischarge of the battery in the charging and discharging process can be effectively avoided.
Description
Technical Field
The invention relates to the technical field of energy storage of lithium ion batteries, in particular to a method and a device for managing charging and discharging of a battery for energy storage and a charging and discharging manager.
Background
In the existing technologies of low-voltage energy storage, high-voltage energy storage and the like, a lithium ion battery is charged by a power grid system and a wind-solar power generation system, and the lithium ion battery is discharged by a load, so that the storage and the use of electric energy are realized. The charge and discharge management of the lithium ion battery is an important link of the management of the energy storage system, and the quality of the design of the charge and discharge management method of the lithium ion battery directly determines the safety and the use efficiency of the energy storage system.
In the conventional charging and discharging management of the energy storage system of the lithium ion battery, constant current charging and discharging is performed, that is, constant power is performed from the beginning to the end of charging and discharging, however, at the end of charging and discharging, the capacities of a plurality of battery cells are different, and problems such as overcharge and overdischarge of a battery cell, insufficient charging and discharging, voltage jitter after load reduction at the end of charging and discharging and the like may occur, so that the charging and discharging efficiency is reduced.
Disclosure of Invention
The invention aims to provide a method and a device for managing charging and discharging of a battery for energy storage and a charging and discharging manager, which solve the problem that in the prior art, the charging and discharging efficiency is reduced due to the adoption of a constant current mode in the charging and discharging process of a lithium ion battery.
The invention provides a charge and discharge management method of a battery for energy storage, which comprises the following steps:
monitoring the voltage of a single battery when the battery for energy storage runs;
judging whether the voltage of the single battery exceeds a preset voltage range or not;
if so, reducing the working power, and adopting the reduced working power to carry out charge and discharge control on the energy storage battery.
Further, the operation process of the energy storage battery comprises a charging process and a discharging process, and the energy storage battery comprises a plurality of single batteries;
the step of monitoring the voltage of the single battery when the battery for energy storage runs comprises the following steps: monitoring the highest charging voltage of a plurality of single batteries in the charging process or monitoring the lowest discharging voltage of the single batteries in the discharging process;
the method for judging whether the voltage of the single battery exceeds a preset voltage range comprises the following steps:
in the charging process of the energy storage battery, judging whether the highest charging voltage is greater than or equal to the load reduction starting charging voltage; if so, determining that the highest charging voltage exceeds a preset voltage range; or judging whether the lowest discharge voltage is less than or equal to the load reduction starting discharge voltage or not in the discharge process of the energy storage battery; and if so, determining that the lowest discharge voltage exceeds a preset voltage range.
Further, the step of reducing the operating power includes:
determining a coefficient for reducing the working power and each load reduction time;
and gradually reducing the working power according to the coefficient for reducing the working power and the load reduction time each time.
Further, the step of determining the coefficient for reducing the operating power includes:
when the energy storage battery is charged, acquiring load reduction charging stopping voltage and a load reduction charging voltage step length;
and dividing the difference value of the highest charging voltage and the load reduction stopping charging voltage by the value of the step length of the load reduction charging voltage to determine the coefficient for reducing the charging power.
Further, the step of determining the coefficient for reducing the operating power includes:
when the energy storage battery discharges, acquiring a load reduction discharge voltage step length;
and dividing the difference value of the lowest discharge voltage and the load reduction starting discharge voltage by the value of the step length of the load reduction discharge voltage to determine the coefficient for reducing the working power.
Further, according to the coefficient of reducing the working power and the load reduction time each time, gradually reducing the working power comprises:
acquiring load reduction charge and discharge power step length and charge and discharge rated power;
the operation power is reduced for each time as follows:
taking the difference value of the step length of the charge-discharge rated power and the load reduction charge-discharge power multiplied by the current coefficient as the working power reduced by the current coefficient;
and according to the current reduced working power, carrying out dynamic charge and discharge along with each load reduction time.
Further, after the step of determining whether the voltage of the battery cell exceeds the preset voltage range, the method further includes:
and when the voltage of the single battery does not exceed a preset voltage range, charging and discharging the energy storage battery by adopting the charging and discharging rated power.
The invention provides a battery charge-discharge management device for energy storage, which comprises:
the acquisition module is used for monitoring the voltage of the single battery when the energy storage battery runs;
the judging module is used for judging whether the voltage of the single battery exceeds a preset voltage range or not;
and the power reduction processing module is used for reducing the working power when the judgment result of the judgment module is yes, and performing charge and discharge control on the energy storage battery by adopting the reduced working power.
The charge and discharge manager provided by the invention comprises a memory and a processor, wherein a computer program capable of running on the processor is stored in the memory, and the processor executes the computer program to realize the steps of the method of any one of the above embodiments.
The invention provides an energy storage system, comprising: the charging and discharging management device, the battery system for energy storage, the energy management system, the energy storage converter and the external instruction module are arranged according to the embodiment; the battery system for energy storage is connected with the energy storage converter, the energy management system is respectively connected with the battery system for energy storage and the energy storage converter, and the external instruction module is connected with the energy management system;
the charging and discharging manager is integrated in the battery system for energy storage, the energy management system or the energy storage converter;
the battery system for energy storage comprises a lithium ion battery and a battery management system, wherein the lithium ion battery is used for storing electric energy, and the battery management system is used for managing and protecting the lithium ion battery;
the energy storage converter is used for being connected with a power grid and a load, and performing current flow between the power grid and the load and the energy storage battery system by adopting bidirectional inversion of direct current and alternating current;
the energy management system is used for managing the battery system for energy storage and the energy storage converter to charge and discharge;
the external instruction module is used for carrying out instruction scheduling on the energy management system.
The present invention provides a computer-readable medium having a computer program stored thereon, the computer program being executed by a processor to perform the apparatus according to any of the above embodiments.
According to the charge and discharge management method, device and charge and discharge manager for the energy storage battery, the voltage of the single battery during the operation of the energy storage battery can be monitored, whether the voltage of the single battery exceeds the preset voltage range or not can be judged, if the voltage of the single battery exceeds the preset voltage range, the charge and discharge of the energy storage battery can be controlled by adopting the reduced working power in a mode of reducing the working power, and the problem that the charge and discharge efficiency is reduced due to the adoption of a constant current mode in the charge and discharge process of a lithium ion battery in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for managing charging and discharging of a battery for energy storage according to an embodiment of the present invention;
fig. 2 is a flowchart of a management method in a charging process according to an embodiment of the present invention;
fig. 3 is a flowchart of a management method in a discharging process according to an embodiment of the present invention;
fig. 4 is a structural diagram of a battery charging and discharging management device for energy storage according to an embodiment of the present invention;
fig. 5 is a structural diagram of an energy storage system according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the conventional charging and discharging management of the energy storage system of the lithium ion battery, constant current charging and discharging is performed, that is, constant power is performed from the beginning to the end of charging and discharging, however, at the end of charging and discharging, the capacities of a plurality of battery cells are different, and problems such as overcharge and overdischarge of a battery cell, insufficient charging and discharging, voltage jitter after load reduction at the end of charging and discharging and the like may occur, so that the charging and discharging efficiency is reduced.
Based on this, the energy storage battery charge-discharge management method, the energy storage battery charge-discharge management device and the charge-discharge manager provided by the invention can judge whether the voltage of the single battery exceeds the preset voltage range by monitoring the voltage of the single battery during the operation of the energy storage battery, and if the voltage of the single battery exceeds the preset voltage range, the energy storage battery can be charged and discharged by adopting the reduced working power in a mode of reducing the working power, so that the problem of reduction of charge-discharge efficiency caused by adopting a constant current mode in the charge-discharge process of the lithium ion battery in the prior art is solved.
The following detailed description is made with reference to the accompanying drawings:
referring to fig. 1, the method for managing charging and discharging of a battery for energy storage according to the present invention includes:
s110: monitoring the voltage of a single battery when the battery for energy storage runs;
when the energy storage battery is charged and discharged, each single body in the energy storage battery can be monitored to obtain the voltage value of each single body in the energy storage battery.
S120: judging whether the voltage of the single battery exceeds a preset voltage range or not;
the operation process of the energy storage battery comprises a charging process and a discharging process, and the preset voltage range is a critical value which causes reduction of charging and discharging efficiency if the charging and discharging process is carried out with constant power.
Further, the energy storage battery includes a plurality of unit batteries; when the energy storage battery includes a plurality of single batteries, the monitoring process of step S110 includes monitoring a highest charging voltage of the plurality of single batteries during the charging process, or monitoring a lowest discharging voltage of the single batteries during the discharging process, and the determining process of step S120 may include determining whether the highest charging voltage is greater than or equal to a load drop starting charging voltage during the charging process of the energy storage battery; if so, determining that the highest charging voltage exceeds a preset voltage range; or judging whether the lowest discharge voltage is less than or equal to the load reduction starting discharge voltage or not in the discharge process of the energy storage battery; and if so, determining that the lowest discharge voltage exceeds a preset voltage range.
In detail, in the charging process, when the energy storage battery is charged soon, if the charging is performed with the power corresponding to the voltage, the charging efficiency may be reduced, that is, problems such as overcharge, insufficient charging, voltage jitter in the charging process may occur, and the voltage may be a load-reduction starting charging voltage. When judging whether the highest voltage exceeds a preset charging and discharging voltage threshold value, judging whether the highest charging voltage is larger than or equal to a reduced starting charging voltage in the charging process, if so, determining that the highest charging voltage exceeds a preset voltage range, executing a step S130, namely, reducing the current charging power value, charging the energy storage battery by adopting the reduced working power, and if not, namely, when the highest charging voltage does not exceed the preset voltage range, charging the energy storage battery by adopting the charging rated power.
Similarly, during discharging, when the energy storage battery is discharged soon to be discharged, that is, the energy storage battery is discharged soon, if the discharge is performed with the power corresponding to the voltage, the discharge efficiency is reduced, that is, problems of overdischarge, insufficient discharge, voltage jitter in the discharge process, and the like occur, and the voltage may be a load reduction starting discharge voltage. And if not, namely when the lowest discharge voltage does not exceed the preset voltage range, discharging the energy storage battery by using the discharge rated power.
S130: if so, reducing the working power, and adopting the reduced power value to charge and discharge the energy storage battery.
The method comprises the steps of determining a coefficient for reducing the working power and load reduction time each time, and then gradually reducing the working power according to the coefficient for reducing the working power and the load reduction time each time.
As an example, when the energy storage battery is charged, referring to fig. 2, determining whether the highest charging voltage is greater than or equal to a load shedding starting charging voltage V1, if not, charging the energy storage battery with a charging rated power, and if so, obtaining a load shedding stopping charging voltage V2 and a load shedding charging voltage step size Vxc; and dividing the difference value of the highest charging voltage Vc and the load reduction stopping charging voltage V2 by the value of the load reduction charging voltage step Vxc to determine a coefficient n of reducing the charging power, namely n is (V2-Vc)/Vxc, wherein n is a natural number.
According to the coefficient for reducing the charging power and the load reduction time each time, the implementation mode of gradually reducing the current charging power value is to obtain the charging rated power Pc and the load reduction charging power step length Pxc, and the charging power reduction for each time is performed as follows: when the current coefficient is 1, the value (Pc-Pxc 1) of the working power of the current coefficient reduction is charged according to (Pc-Pxc 1) in each load reduction time t; when the current coefficient is 2, the current reduced working power value (Pc-Pxc 2) is charged according to (Pc-Pxc 2) in each load reduction time t; and analogizing in turn, when the current coefficient is n times, the current reduced operating power value (Pc-Pxc n) is charged according to the value (Pc-Pxc n) in each load reduction time t. And in the process of reducing the working power, judging whether the highest charging voltage is greater than the load reduction stopping charging voltage V2, if so, finishing charging, and if not, continuing to operate in the manner described above. Meanwhile, if the highest charging voltage is still not greater than the load reduction stop charging voltage V2 after the calculated total coefficient of the reduced operating power is over, the charging is performed with the operating power reduced last time.
When charging is carried out according to each reduced working power, the timer T is started simultaneously, when the timer T is judged to be less than Tx, the charging can be carried out according to the reduced working power of the current time of the current coefficient, if not, the timer T can be stopped, the timer time is counted as 0, and the next time is counted again.
Wherein, the rated power Pc that charges is 100KW, and the power step length Pxc that charges that carries falls is 10KW, and the voltage V1 that begins to charge that carries that falls is 3.50V, and the voltage V2 that stops charging that carries that falls is 3.65V, and the voltage step length that charges that carries that falls is: 10mV, and the timer time Tx is 10min, namely the load reduction time each time.
As another example, when the energy storage battery discharges, as shown in fig. 3, it is determined whether the lowest discharge voltage Vf is less than or equal to the load shedding start discharge voltage V3, if not, the energy storage battery is discharged with the discharge rated power, and if so, a load shedding discharge voltage step length Vxf is obtained; the difference between the lowest discharge voltage Vf and the load shedding start discharge voltage V3 is divided by the value of the load shedding voltage step Vxf, and determined as a coefficient for reducing discharge power, i.e., m ═ V3/Vxf.
As in the charging, the gradual reduction of the operating power is realized by obtaining the discharge rated power Pf and the step size Pxf of the load reduction power, and the operation power reduction is performed as follows for each time: when the current coefficient is 1, the current reduced working power value (Pf-Pxf x 1) is discharged according to (Pf-Pxf x 1) in each load reduction time t; when the current coefficient is 2 times, the current reduced working power value is (Pf-Pxf x 2), discharging is carried out according to (Pf-Pxf x 2) in each load reduction time t, and the like, when the current coefficient is m, the current reduced working power value is (Pf-Pxf x m), discharging is carried out according to (Pf-Pxf x m) in each load reduction time t, whether the lowest discharging voltage Vf is smaller than the load reduction stopping discharging voltage V4 is judged in the process of reducing the working power, if yes, charging is finished, if not, the working power is continuously reduced, and meanwhile, when the total coefficient which is reduced is finished, the lowest discharging voltage is still not smaller than the load reduction stopping discharging voltage V4, discharging is carried out with the power which is reduced last time.
When the discharging is carried out according to the reduced working power every time, the timer T is started at the same time, when the timer T is judged to be less than Tx, the discharging can be carried out continuously according to the working power reduced by the current time of the current coefficient, if not, the timer T can be stopped, the timer time is counted as 0, and the next time is counted again.
Wherein, discharge rated power Pf is 100KW, the load shedding discharge power step length Pxf is 10KW, the load shedding discharge starting voltage V3 is 3.15V, the load shedding discharge stopping voltage V4 is 3.00V, the load shedding discharge voltage step length is: 10mV, timer time Tx is 10 min.
Referring to fig. 4, the present invention provides a battery charging/discharging management device for energy storage, including:
an obtaining module 410, configured to monitor a voltage of a single battery when the energy storage battery operates;
the judging module 420 is configured to judge whether the voltage of the single battery exceeds a preset voltage range;
and a power reduction processing module 430, configured to reduce the working power if the determination result of the determining module is yes, and perform charge and discharge control on the energy storage battery by using the reduced working power.
The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.
The charge and discharge manager provided by the invention comprises a memory and a processor, wherein a computer program capable of running on the processor is stored in the memory, and the processor executes the computer program to realize the steps of the method of any one of the above embodiments.
Referring to fig. 5, the present invention provides an energy storage system, including: the charging and discharging management device, the energy storage battery system 1, the energy management system 6, the energy storage converter 4 and the external instruction module 5 are described according to the embodiment; the energy storage battery system 1 is connected with the energy storage converter 4, the energy management system 6 is respectively connected with the energy storage battery system 1 and the energy storage converter 4 and can communicate in a wireless or wired mode, and the external instruction module 5 is connected with the energy management system 6 and can communicate in a wireless or wired mode;
the charging and discharging manager is integrated in the battery system 1 for energy storage, the energy management system 6 or the energy storage converter 4;
the battery system 1 for energy storage comprises a lithium ion battery 2 and a battery management system 3, wherein the lithium ion battery 2 is used for storing electric energy, and the battery management system 3 is used for managing and protecting the lithium ion battery;
the energy storage converter 4 is used for being connected with a power grid 7 and a load 8, and current flows between the power grid 7 and the load 8 and the energy storage battery system 1 by adopting bidirectional inversion of direct current and alternating current; the power grid can provide an electric energy source for the energy storage system; the load can be used to consume electrical energy from the energy storage system as well as the grid.
The energy management system 6 is used for managing the charging and discharging of the battery system 1 for energy storage and the energy storage converter 4;
the external instruction module 5 is used for performing instruction scheduling on the energy management system 6.
Optionally, the battery system 1 for energy storage is a 300KWH lithium battery system, the lithium ion battery 2 is a 210 series-2 parallel battery pack lithium battery, the battery management system 3 is a lithium battery management system, and the energy storage converter 4 is 100KWPCS (AC/DC).
The present invention provides a computer-readable medium having a computer program stored thereon, the computer program being executed by a processor to perform the apparatus according to any of the above embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A method for managing charging and discharging of a battery for energy storage is characterized by comprising the following steps:
monitoring the voltage of a single battery when the battery for energy storage runs;
judging whether the voltage of the single battery exceeds a preset voltage range or not;
if so, reducing the working power, and performing charge-discharge control on the energy storage battery by adopting the reduced working power;
the operation process of the battery for energy storage comprises a charging process and a discharging process, and the battery for energy storage comprises a plurality of single batteries;
the step of monitoring the voltage of the single battery when the battery for energy storage runs comprises the following steps: monitoring the highest charging voltage of the plurality of single batteries in the charging process, or monitoring the lowest discharging voltage of the single batteries in the discharging process;
the method for judging whether the voltage of the single battery exceeds a preset voltage range comprises the following steps:
in the charging process of the energy storage battery, judging whether the highest charging voltage is greater than or equal to the load reduction starting charging voltage; if so, determining that the highest charging voltage exceeds a preset voltage range; or judging whether the lowest discharge voltage is less than or equal to the load reduction starting discharge voltage or not in the discharge process of the energy storage battery; if so, determining that the lowest discharge voltage exceeds a preset voltage range;
the step of reducing the operating power comprises:
determining a coefficient for reducing the working power and each load reduction time;
according to the coefficient for reducing the working power and the load reduction time each time, gradually reducing the working power;
wherein the step of determining the coefficient for reducing the operating power comprises:
when the energy storage battery is charged, acquiring load reduction charging stopping voltage and a load reduction charging voltage step length; dividing the difference value of the highest charging voltage and the load reduction stopping charging voltage by the value of the step length of the load reduction charging voltage to determine a coefficient for reducing the charging power;
when the energy storage battery discharges, acquiring a load reduction discharge voltage step length; dividing the difference value of the lowest discharge voltage and the load reduction starting discharge voltage by the value of the step length of the load reduction discharge voltage to determine a coefficient for reducing the working power;
according to the coefficient for reducing the working power and the load reduction time of each time, the working power is reduced step by step, and the method comprises the following steps:
acquiring load reduction charge and discharge power step length and charge and discharge rated power;
each reduction in operating power is performed as follows:
taking the difference value of the step length of the charging and discharging rated power and the load reduction charging and discharging power multiplied by the current coefficient as the current reduced working power;
and according to the current reduced working power, carrying out dynamic charge and discharge along with each load reduction time.
2. The energy storage battery charge and discharge management method according to claim 1, wherein after the step of determining whether the voltage of the single battery exceeds a preset voltage range, the method further comprises:
and when the voltage of the single battery does not exceed a preset voltage range, charging and discharging the energy storage battery by adopting the charging and discharging rated power.
3. A battery charge-discharge management device for energy storage is characterized by comprising:
the acquisition module is used for monitoring the voltage of the single battery when the energy storage battery runs;
the judging module is used for judging whether the voltage of the single battery exceeds a preset voltage range or not;
the power reduction processing module is used for reducing the working power when the judgment result of the judgment module is yes, and performing charge and discharge control on the energy storage battery by adopting the reduced working power;
the operation process of the battery for energy storage comprises a charging process and a discharging process, and the battery for energy storage comprises a plurality of single batteries;
the acquisition module is configured to: monitoring the highest charging voltage of the plurality of single batteries in the charging process, or monitoring the lowest discharging voltage of the single batteries in the discharging process;
the judging module is used for: in the charging process of the energy storage battery, judging whether the highest charging voltage is greater than or equal to the load reduction starting charging voltage; if so, determining that the highest charging voltage exceeds a preset voltage range; or judging whether the lowest discharge voltage is less than or equal to the load reduction starting discharge voltage or not in the discharge process of the energy storage battery; if so, determining that the lowest discharge voltage exceeds a preset voltage range;
the power reduction processing module is to: determining a coefficient for reducing the working power and each load reduction time; according to the coefficient for reducing the working power and the load reduction time each time, gradually reducing the working power;
wherein the step of determining the coefficient for reducing the operating power comprises:
when the energy storage battery is charged, acquiring load reduction charging stopping voltage and a load reduction charging voltage step length; dividing the difference value of the highest charging voltage and the load reduction stopping charging voltage by the value of the step length of the load reduction charging voltage to determine a coefficient for reducing the charging power;
when the energy storage battery discharges, acquiring a load reduction discharge voltage step length; dividing the difference value of the lowest discharge voltage and the load reduction starting discharge voltage by the value of the step length of the load reduction discharge voltage to determine a coefficient for reducing the working power;
in the power reduction processing module, according to the coefficient for reducing the working power and the load reduction time each time, gradually reducing the working power comprises:
acquiring load reduction charge and discharge power step length and charge and discharge rated power;
each reduction in operating power is performed as follows:
taking the difference value of the step length of the charging and discharging rated power and the load reduction charging and discharging power multiplied by the current coefficient as the current reduced working power;
and according to the current reduced working power, carrying out dynamic charge and discharge along with each load reduction time.
4. A charge and discharge manager comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any one of claims 1 to 2 when executing the computer program.
5. An energy storage system, comprising: the charge and discharge manager, the battery system for energy storage, the energy management system, the energy storage converter and the external instruction module of claim 4; the battery system for energy storage is connected with the energy storage converter, the energy management system is respectively connected with the battery system for energy storage and the energy storage converter, and the external instruction module is connected with the energy management system;
the charging and discharging manager is integrated in the battery system for energy storage, the energy management system or the energy storage converter;
the battery system for energy storage comprises a lithium ion battery and a battery management system, wherein the lithium ion battery is used for storing electric energy, and the battery management system is used for managing and protecting the lithium ion battery;
the energy storage converter is used for being connected with a power grid and a load, and current flows between the power grid and the load and the energy storage battery system by adopting bidirectional inversion of direct current and alternating current;
the energy management system is used for managing the battery system for energy storage and the energy storage converter to charge and discharge;
the external instruction module is used for carrying out instruction scheduling on the energy management system.
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| CN110601283A (en) * | 2019-08-14 | 2019-12-20 | 浙江南都电源动力股份有限公司 | Charging method and system |
| CN114389334B (en) * | 2021-12-20 | 2024-05-31 | 深圳市理德铭科技股份有限公司 | Notebook charger for prolonging service life of battery |
| CN115649006A (en) * | 2022-10-27 | 2023-01-31 | 中国第一汽车股份有限公司 | Control system and method of power battery and vehicle |
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