CN116191626A - Battery management method, device and system for household energy storage system - Google Patents
Battery management method, device and system for household energy storage system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 202
- 238000007726 management method Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 6
- 210000000352 storage cell Anatomy 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 10
- 238000004364 calculation method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- 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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
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- 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
Abstract
The invention discloses a battery management method, device and system of a household energy storage system. And then, determining a selection threshold value for selecting the battery for use in real time according to the acquired cycle number information or SOH data corresponding to all the energy storage batteries. And finally, comparing the acquired circulation times information or SOH data corresponding to each energy storage battery with a selection threshold value so as to evaluate the circulation state or health state of each energy storage battery, and selecting the optimal energy storage battery to supply power, so that the circulation times or health state of each energy storage battery of the whole household energy storage system is kept balanced, and the service time of the energy storage system is prolonged.
Description
Technical Field
The invention relates to the technical field of charging or discharging methods, in particular to a method, a device and a system for managing batteries of a household energy storage system.
Background
The household energy storage system generally comprises a photovoltaic module, an energy storage battery, an inverter and the like, the photovoltaic module can generate electricity in the daytime, the generated electric energy can be supplied to a household load, the redundant electric energy is stored in the energy storage battery, and the household load can be supplied with electricity through the energy storage battery at night.
The patent application with the application number of 2023100925209 discloses a portable household energy storage system, and the main control board can detect the state of charge of every group battery through the BMS board that sets up to according to the state of charge of every group battery, select the output relay closure that the group battery that satisfies the power supply condition is connected, in order to control these group batteries to outwards supply power. Meanwhile, a charging relay connected with the battery packs which do not meet the power supply condition is controlled to be closed, so that the battery packs are charged through a charger, the battery packs which meet the power supply condition are controlled to replace the battery packs with reduced electric quantity in real time, and the power supply time is further prolonged.
However, in this technical solution, when the battery pack is selected to supply power, only the state of charge of the battery pack is considered, and the state of health of the battery pack is not considered. Therefore, the situation that a certain battery pack is charged and discharged frequently is likely to occur, so that the cycle number of the battery pack is far greater than that of other battery packs, and once the cycle number exceeds a set frequency threshold value, the battery pack needs to be retired and recycled, and the whole energy storage system cannot be used continuously.
Most of the prior art passively monitors the cycle number of each battery, for example, patent application publication No. CN107634275a discloses a battery management method, a charging cabinet and a battery management system, and when the cycle number of the battery exceeds a quality assurance threshold, the battery is retired. The charge and discharge of all the battery packs are not actively allocated and managed to keep the cycle times of each battery pack balanced.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a battery management method, device and system for a household energy storage system. All the battery packs can be actively allocated and managed, so that the cycle times of each battery pack are kept balanced. The specific technical scheme is as follows:
in a first aspect, a method for managing a battery of a household energy storage system is provided, including:
acquiring corresponding cycle times or SOH data of each energy storage battery;
determining a selected threshold according to the corresponding cycle times or SOH data of all the energy storage batteries;
and comparing the cycle times or SOH data corresponding to the energy storage batteries with the selected threshold value, and selecting the corresponding energy storage battery as a service battery according to the comparison result.
With reference to the first aspect, in a first implementation manner of the first aspect, the determining the selection threshold according to the cycle times or SOH data corresponding to all the energy storage batteries includes:
counting the circulation times or SOH data corresponding to all the energy storage batteries, and determining the median and standard deviation corresponding to the circulation times or SOH data;
and determining the selection threshold according to the median value and the standard deviation.
With reference to the first aspect, in a second implementation manner of the first aspect, the method further includes: and acquiring the identification codes corresponding to the energy storage batteries, and generating corresponding prompt information according to the identification codes corresponding to the given batteries.
With reference to the first aspect, in a third implementation manner of the first aspect, the selecting, according to the comparison result, a corresponding energy storage battery as the donor battery includes:
selecting an energy storage battery with the cycle times smaller than the corresponding selection threshold value as an alternative battery, or selecting an energy storage battery with SOH data larger than the corresponding selection threshold value as an alternative battery;
acquiring the charge states corresponding to all the alternative batteries;
and matching the charge states corresponding to the alternative batteries with power supply conditions, and selecting the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
In a second aspect, there is provided a household energy storage system battery management apparatus comprising:
the acquisition module is configured to acquire the corresponding cycle times or SOH data of each energy storage battery;
the determining module is configured to determine a selection threshold according to the corresponding cycle times or SOH data of all the energy storage batteries;
and the comparison module is configured to compare the cycle times or SOH data corresponding to each energy storage battery with the selected threshold value, and select the corresponding energy storage battery as the service battery according to the comparison result.
With reference to the second aspect, in a first implementation manner of the second aspect, the determining module includes:
the statistics unit is configured to count the circulation times or SOH data corresponding to all the energy storage batteries and determine the median and standard deviation corresponding to the circulation times or SOH data;
and the calculating unit is configured to calculate the selection threshold according to the median value and the standard deviation.
With reference to the two aspects, in a second implementation manner of the second aspect, the device further includes a prompt module, where the prompt module is configured to obtain an identification code corresponding to each energy storage battery, and send corresponding prompt information according to the identification code corresponding to the given battery.
With reference to the second aspect, in a third implementation manner of the second aspect, the comparing module includes:
a selecting unit configured to select an energy storage battery with a cycle number smaller than a corresponding selection threshold as an alternative battery, or an energy storage battery with SOH data larger than the corresponding selection threshold as an alternative battery;
the acquisition unit is configured to acquire the charge states corresponding to all the alternative batteries;
and the matching unit is configured to match the charge states corresponding to the alternative batteries with power supply conditions, and select the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
In a third aspect, a battery management system for a household energy storage system is provided, comprising:
the BMS system of each energy storage battery is configured to determine the corresponding cycle times or SOH data of the energy storage battery;
the management terminal is respectively in communication connection with the BMS system of each energy storage battery and is configured to:
acquiring cycle times or SOH data sent by a BMS system of each energy storage battery, and determining a selection threshold according to all acquired cycle times or SOH data;
and comparing the cycle times or SOH data corresponding to the energy storage batteries with the selected threshold value, and selecting the corresponding energy storage battery as a service battery according to the comparison result.
With reference to the third aspect, in a first implementation manner of the third aspect, the management terminal determines the selection threshold by using the following method:
counting the circulation times or SOH data corresponding to all the energy storage batteries, and determining the median and standard deviation corresponding to the circulation times or SOH data;
and determining the selection threshold according to the median value and the standard deviation.
With reference to the third aspect, in a second implementation manner of the third aspect, the management terminal is further configured to obtain an identification code sent by each BMS system, and send corresponding prompt information according to the identification code sent by the BMS system using the battery.
With reference to the third aspect, in a third implementation manner of the third aspect, the management terminal includes:
selecting an energy storage battery with the cycle times smaller than the corresponding selection threshold value as an alternative battery, or selecting an energy storage battery with SOH data larger than the corresponding selection threshold value as an alternative battery;
acquiring the charge states corresponding to all the alternative batteries;
and matching the charge states corresponding to the alternative batteries with power supply conditions, and selecting the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
The beneficial effects are that: by adopting the battery management method, the device and the system of the household energy storage system, the selection threshold value for selecting the used battery can be calculated through the obtained circulation times or SOH data corresponding to each battery pack, and the circulation times or SOH data of each battery pack are compared with the selection threshold value, so that the circulation state or health state of each battery pack is evaluated, the battery pack with the minimum charge circulation times or the best health state is selected for supplying power, the circulation times or health state of each battery pack of the whole household energy storage system is kept balanced, and the service time of the energy storage system is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. Throughout the drawings, the elements or portions are not necessarily drawn to actual scale.
FIG. 1 is a flowchart of a method for managing a battery of a household energy storage system according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for determining a selection threshold according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a selection of a battery for use according to an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a battery management device of a household energy storage system according to an embodiment of the present invention;
FIG. 5 is a schematic block diagram of a determination module according to an embodiment of the present invention;
FIG. 6 is a schematic block diagram of a comparison module according to an embodiment of the present invention;
FIG. 7 is a system block diagram of a battery management system for a household energy storage system according to an embodiment of the present invention;
fig. 8 is a system block diagram of a conventional household energy storage system.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
It should be understood that, as shown in fig. 8, the household energy storage system in this embodiment includes a household PCS, a plurality of battery packs and a main control board. The power ends of BMS plates of each battery pack are respectively and electrically connected with the DC buses through the normally open switches of the corresponding output relays, and are respectively and electrically connected with the output ends of different AC chargers through the normally open switches of the corresponding charging relays, and the DC buses are electrically connected with the battery ports of the household PCS. The coil signal connection master control board of output relay and charging relay, master control board and the BMS board communication connection of each group battery to acquire the circulation number or the SOH data of each group battery, and allocate each group battery to charge or discharge according to the data that obtain.
It should also be understood that, in the present embodiment, the "SOH data" is collectively referred to as "Stateo of health", which is also called battery capacity, health, or performance status, and refers to the percentage of the full charge capacity of the battery relative to the rated capacity, the battery is shipped to 100%, and the battery rejection is 0%. The BMS board of the battery pack can calculate SOH data of the battery pack using an existing algorithm.
The "cycle times" may also be referred to as "cycle charge times", "cycle discharge times" or "cycle charge and discharge times", and may be expressed as the total number of all and part of the discharge cycles in the service life of the battery. For example, discharging the battery pack to 50% of the amount of electricity twice is recorded as one discharge period, and the number of cycles of all the battery packs is limited. The BMS board of the battery pack may calculate the number of cycles of the battery pack using an existing algorithm.
It should also be understood that the "household PCS" is also called a household energy storage converter, and can control the charging and discharging processes of the battery pack to perform ac-dc conversion, and can directly supply power to the household load in the case of no power grid.
The "BMS board" is also called a BMS battery system, or battery manager, and can monitor various states of the battery, such as state of charge (SOC state), battery health, cycle number, etc.
A flowchart of a method for managing a battery of a household energy storage system as shown in fig. 1, the method comprising:
step 1, acquiring corresponding cycle times or SOH data of each energy storage battery;
step 2, determining a selected threshold according to the cycle times or SOH data corresponding to all the energy storage batteries;
and step 3, comparing the cycle times or SOH data corresponding to the energy storage batteries with the selected threshold value, and selecting the corresponding energy storage battery as a service battery according to the comparison result.
Specifically, first, the main control board may acquire cycle number information or SOH data transmitted from the BMS board of each energy storage battery in real time. Then, the main control board can determine a selection threshold value for selecting the used battery in real time according to the acquired cycle number information or SOH data corresponding to all the energy storage batteries. Finally, the main control board can compare the acquired circulation times information or SOH data corresponding to each energy storage battery with a selection threshold value so as to evaluate the circulation state or health state of each energy storage battery, and select the optimal energy storage battery to supply power, so that the circulation times or health state of each energy storage battery of the whole household energy storage system are kept balanced, and the service time of the energy storage system is prolonged.
The process of determining the threshold value in step 2 will be described in detail with reference to fig. 2.
In this embodiment, optionally, determining the selection threshold according to the cycle times or SOH data corresponding to all the energy storage batteries includes:
step 2-1, counting the circulation times or SOH data corresponding to all the energy storage batteries, and determining the median value and standard deviation corresponding to the circulation times or SOH data;
and 2-2, determining the selected threshold according to the median value and the standard deviation.
Specifically, first, the main control board may perform normal distribution analysis on the obtained cycle numbers corresponding to all the energy storage batteries, and calculate a median value and a standard deviation corresponding to the cycle numbers, where a specific calculation formula is as follows:
wherein x is i And N is the number of the energy storage batteries, and sigma and mu are the standard deviation and the median corresponding to the number of the cycles respectively.
Then, the main control board can determine a selection threshold lambda according to the median value and standard deviation corresponding to the calculated cycle times and a set selection coefficient, wherein the selection coefficient can be obtained through multiple energy storage battery charging and discharging tests, and the specific calculation formula is as follows:
λ＝μ+1.3σ。
the calculated selection threshold represents the average cycle times corresponding to all the energy storage batteries in the household energy storage system. And comparing the circulation times corresponding to each energy storage battery with a selected threshold value calculated according to the circulation times, and selecting the energy storage battery with the circulation times smaller than the selected threshold value as a power supply battery. Therefore, the cycle times of each battery pack of the whole household energy storage system can be kept balanced, and the service time of the energy storage system is prolonged.
It should be understood that the driving control may also adopt the above calculation formula, determine a selection threshold value for selecting the battery for use according to the obtained SOH data, and compare the SOH data of each energy storage battery with the selection threshold value, and select the energy storage battery with SOH data greater than the selection threshold value as the battery for use, so that the health state of each battery pack of the whole household energy storage system is kept balanced, and the service time of the energy storage system is prolonged.
In this embodiment, optionally, as shown in fig. 3, the selecting, according to the comparison result, the corresponding energy storage battery as the donor battery includes:
step 3-1, selecting an energy storage battery with the cycle times smaller than the corresponding selection threshold value as an alternative battery, or selecting an energy storage battery with SOH data larger than the corresponding selection threshold value as an alternative battery;
step 3-2, acquiring the charge states corresponding to all the alternative batteries;
and 3-3, matching the charge states corresponding to the alternative batteries with power supply conditions, and selecting the alternative batteries with the charge states meeting the power supply conditions as power supply batteries.
Specifically, it should be understood that, in the given battery selected by selecting the threshold value, there may be an energy storage battery whose state of charge does not satisfy the power supply condition, that is, the stored electric quantity of the given battery is too low to supply power. Therefore, when the main control board selects the power supply battery, firstly, the energy storage batteries with the cycle times smaller than the selected threshold value calculated according to the cycle times can be selected as standby batteries. Then, the states of charge of all the battery cells are obtained through the BMS board of the battery cells. And finally, comparing the state of charge of each standby battery with a preset state of charge threshold, and selecting the standby battery exceeding the state of charge threshold as a supply battery to be supplied to a user for use, thereby avoiding supplying the energy storage battery with insufficient electric quantity to the user for use and ensuring the normal use of the whole user system.
It should be understood that the main control board may also select an energy storage battery with an SOH value greater than a selected threshold calculated according to SOH data as the backup battery.
In this embodiment, the identification code corresponding to each energy storage battery is obtained, and corresponding prompt information is generated according to the identification code corresponding to the given battery. Specifically, when the communication connection is established with the energy storage battery, the BMS board of the energy storage battery can send the corresponding identification code to the main control board, the main control board can store the identification code in one-to-one correspondence with the energy storage battery, and the identification code can comprise the number of the energy storage battery. After the main control board selects the used battery, the main control board can generate corresponding prompt information according to the identification code corresponding to the used battery, so as to prompt a user of the number corresponding to the used battery.
The functional block diagram of the household energy storage system battery management device shown in fig. 4 comprises:
the acquisition module is configured to acquire the corresponding cycle times or SOH data of each energy storage battery;
the determining module is configured to determine a selection threshold according to the corresponding cycle times or SOH data of all the energy storage batteries;
and the comparison module is configured to compare the cycle times or SOH data corresponding to each energy storage battery with the selected threshold value, and select the corresponding energy storage battery as the service battery according to the comparison result.
Specifically, the main control board comprises an acquisition module, a determination module and a comparison module. The acquisition module can acquire cycle number information or SOH data sent by the BMS board of each energy storage battery in real time. The determining module can determine a selection threshold value for selecting the battery for use in real time according to the acquired cycle number information or SOH data corresponding to all the energy storage batteries. The comparison module can compare the acquired circulation times information or SOH data corresponding to each energy storage battery with a selection threshold value so as to evaluate the circulation state or health state of each energy storage battery, so that the optimal energy storage battery is selected for power supply, the circulation times or health state of each energy storage battery of the whole household energy storage system is kept balanced, and the service time of the energy storage system is prolonged.
In this embodiment, optionally, as shown in fig. 5, the determining module includes:
the statistics unit is configured to count the circulation times or SOH data corresponding to all the energy storage batteries and determine the median and standard deviation corresponding to the circulation times or SOH data;
and the calculating unit is configured to calculate the selection threshold according to the median value and the standard deviation.
Specifically, the determining module is composed of a statistics unit and a calculation unit. The statistics unit can count the acquired circulation times corresponding to all the energy storage batteries, and determine the median value and standard deviation of the circulation times corresponding to the whole energy storage system. The calculation unit can calculate a selection threshold according to the calculated median and standard deviation so as to represent the average cycle times corresponding to the energy storage battery of the whole energy storage system.
It should be understood that the statistics unit may further perform statistics on SOH data corresponding to all the obtained energy storage batteries, to determine a median SOH value and a standard deviation corresponding to the whole energy storage system. The calculation unit may also determine a selection threshold for selecting the battery for use based on the SOH median and the standard deviation.
In this embodiment, optionally, as shown in fig. 6, the comparing module includes:
a selecting unit configured to select an energy storage battery with a cycle number smaller than a corresponding selection threshold as an alternative battery, or an energy storage battery with SOH data larger than the corresponding selection threshold as an alternative battery;
the acquisition unit is configured to acquire the charge states corresponding to all the alternative batteries;
and the matching unit is configured to match the charge states corresponding to the alternative batteries with power supply conditions, and select the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
Specifically, the comparison module is composed of a selection unit, an acquisition unit and a matching unit. The selecting unit may select all the energy storage batteries with the cycle times smaller than the selected threshold calculated according to the cycle times as the backup battery. The acquiring unit may acquire the states of charge of all the battery cells through the BMS board of the battery cells. The matching unit compares the state of charge of each standby battery with a preset state of charge threshold value, and selects the standby battery exceeding the state of charge threshold value as a battery for supplying to a user, so that the energy storage battery with insufficient electric quantity is prevented from being supplied to the user for use, and the normal use of the whole user system is ensured.
It should be understood that the selection unit may also select, as the candidate battery, an energy storage battery having an SOH value greater than the selection threshold calculated from SOH data, based on SOH data.
In this embodiment, optionally, the device further includes a prompt module, where the prompt module is configured to obtain the identification codes corresponding to the energy storage batteries, and send out corresponding prompt information according to the identification codes corresponding to the given batteries.
Specifically, the management device further comprises a prompt module, the prompt module can acquire identification codes sent by the energy storage batteries, and the identification codes correspond to the energy storage batteries and comprise the numbers of the energy storage batteries. The prompting module can store the identification codes in one-to-one correspondence with the energy storage batteries, and after the comparison module selects the used batteries, the prompting module can generate corresponding prompting information according to the identification codes corresponding to the used batteries selected by the comparison module, so as to prompt a user of the numbers corresponding to the used batteries.
A system block diagram of a household energy storage system battery management system as shown in fig. 7, the management system comprising:
the BMS system of each energy storage battery is configured to determine the corresponding cycle times or SOH data of the energy storage battery;
the management terminal is respectively in communication connection with the BMS system of each energy storage battery and is configured to:
acquiring cycle times or SOH data sent by a BMS system of each energy storage battery, and determining a selection threshold according to all acquired cycle times or SOH data;
and comparing the cycle times or SOH data corresponding to the energy storage batteries with the selected threshold value, and selecting the corresponding energy storage battery as a service battery according to the comparison result.
Specifically, the management system is composed of a management terminal and a BMS system of each energy storage battery. The management terminal can acquire cycle number information or SOH data sent by the BMS system of each energy storage battery in real time, and determines a selection threshold value for selecting the battery according to the acquired cycle number information or SOH data corresponding to all the energy storage batteries in real time. The management terminal can compare the acquired circulation times information or SOH data corresponding to each energy storage battery with a selection threshold value so as to evaluate the circulation state or health state of each energy storage battery, so that the optimal energy storage battery is selected for power supply, the circulation times or health state of each energy storage battery of the whole household energy storage system is kept balanced, and the service time of the energy storage system is prolonged.
In this embodiment, optionally, the management terminal determines the selection threshold by using the following method:
counting the circulation times or SOH data corresponding to all the energy storage batteries, and determining the median and standard deviation corresponding to the circulation times or SOH data;
and determining the selection threshold according to the median value and the standard deviation.
Specifically, firstly, the management terminal may perform normal distribution analysis on the obtained cycle numbers corresponding to all the energy storage batteries, and calculate a median value and a standard deviation corresponding to the cycle numbers, where the specific calculation formula is as follows:
wherein x is i And N is the number of the energy storage batteries, and sigma and mu are the standard deviation and the median corresponding to the number of the cycles respectively.
Then, the management terminal can determine a selection threshold lambda according to the median value and standard deviation corresponding to the calculated cycle times and a set selection coefficient, wherein the selection coefficient can be obtained through multiple energy storage battery charging and discharging tests, and the specific calculation formula is as follows:
λ＝μ+1.3σ。
the calculated selection threshold represents the average cycle times corresponding to all the energy storage batteries in the household energy storage system. And comparing the circulation times corresponding to each energy storage battery with a selected threshold value calculated according to the circulation times, and selecting the energy storage battery with the circulation times smaller than the selected threshold value as a power supply battery. Therefore, the cycle times of each battery pack of the whole household energy storage system can be kept balanced, and the service time of the energy storage system is prolonged.
It should be understood that the management terminal may further determine a selection threshold for selecting the service battery according to the obtained SOH data, and compare the SOH data of each energy storage battery with the selection threshold, and select the energy storage battery with SOH data greater than the selection threshold as the service battery, so that the health status of each battery pack of the whole household energy storage system is kept balanced, and the service time of the energy storage system is prolonged.
In this embodiment, optionally, the management terminal includes:
selecting an energy storage battery with the cycle times smaller than the corresponding selection threshold value as an alternative battery, or selecting an energy storage battery with SOH data larger than the corresponding selection threshold value as an alternative battery;
acquiring the charge states corresponding to all the alternative batteries;
and matching the charge states corresponding to the alternative batteries with power supply conditions, and selecting the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
Specifically, when the management terminal selects the service battery, first, all the energy storage batteries with the cycle times smaller than the selection threshold calculated according to the cycle times can be selected as the standby battery. Then, the states of charge of all the battery cells are acquired through the battery cell BMS system. And finally, comparing the state of charge of each standby battery with a preset state of charge threshold, and selecting the standby battery exceeding the state of charge threshold as a supply battery to be supplied to a user for use, thereby avoiding supplying the energy storage battery with insufficient electric quantity to the user for use and ensuring the normal use of the whole user system.
It should be understood that the management terminal may also select, as the backup battery, an energy storage battery having an SOH value greater than the selection threshold calculated from the SOH data.
In this embodiment, the management terminal is further configured to obtain the identification codes sent by the BMS systems, and send corresponding prompt information according to the identification codes sent by the BMS systems of the battery. Specifically, when the management terminal establishes communication connection with the BMS system of the energy storage battery, the BMS system of the energy storage battery can send the corresponding identification code to the management terminal, the management terminal can store the identification code in one-to-one correspondence with the energy storage battery, and the identification code can comprise the number of the energy storage battery. After the management terminal selects the used battery, the management terminal can generate corresponding prompt information according to the identification code corresponding to the used battery, so as to prompt the user of the number corresponding to the used battery.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (12)
1. A method for managing a battery of a household energy storage system, comprising:
acquiring corresponding cycle times or SOH data of each energy storage battery;
determining a selected threshold according to the corresponding cycle times or SOH data of all the energy storage batteries;
and comparing the cycle times or SOH data corresponding to the energy storage batteries with the selected threshold value, and selecting the corresponding energy storage battery as a service battery according to the comparison result.
2. The method of claim 1, wherein determining the selection threshold according to the number of cycles or SOH data corresponding to all the energy storage cells comprises:
counting the circulation times or SOH data corresponding to all the energy storage batteries, and determining the median and standard deviation corresponding to the circulation times or SOH data;
and determining the selection threshold according to the median value and the standard deviation.
3. The household energy storage system battery management method of claim 1, further comprising: and acquiring the identification codes corresponding to the energy storage batteries, and generating corresponding prompt information according to the identification codes corresponding to the given batteries.
4. The method for managing a battery of a household energy storage system according to claim 1, wherein selecting a corresponding energy storage battery as a given battery according to the comparison result comprises:
selecting an energy storage battery with the cycle times smaller than the corresponding selection threshold value as an alternative battery, or selecting an energy storage battery with SOH data larger than the corresponding selection threshold value as an alternative battery;
acquiring the charge states corresponding to all the alternative batteries;
and matching the charge states corresponding to the alternative batteries with power supply conditions, and selecting the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
5. A household energy storage system battery management device, comprising:
the acquisition module is configured to acquire the corresponding cycle times or SOH data of each energy storage battery;
the determining module is configured to determine a selection threshold according to the corresponding cycle times or SOH data of all the energy storage batteries;
and the comparison module is configured to compare the cycle times or SOH data corresponding to each energy storage battery with the selected threshold value, and select the corresponding energy storage battery as the service battery according to the comparison result.
6. The household energy storage system battery management apparatus of claim 5, wherein the determination module comprises:
the statistics unit is configured to count the circulation times or SOH data corresponding to all the energy storage batteries and determine the median and standard deviation corresponding to the circulation times or SOH data;
and the calculating unit is configured to calculate the selection threshold according to the median value and the standard deviation.
7. The battery management device of claim 5, further comprising a prompt module configured to obtain the identification codes corresponding to the energy storage batteries, and send out corresponding prompt information according to the identification codes corresponding to the given batteries.
8. The household energy storage system battery management apparatus of claim 1, wherein the comparison module comprises:
a selecting unit configured to select an energy storage battery with a cycle number smaller than a corresponding selection threshold as an alternative battery, or an energy storage battery with SOH data larger than the corresponding selection threshold as an alternative battery;
the acquisition unit is configured to acquire the charge states corresponding to all the alternative batteries;
and the matching unit is configured to match the charge states corresponding to the alternative batteries with power supply conditions, and select the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
9. A household energy storage system battery management system, comprising:
the BMS system of each energy storage battery is configured to determine the corresponding cycle times or SOH data of the energy storage battery;
the management terminal is respectively in communication connection with the BMS system of each energy storage battery and is configured to:
acquiring cycle times or SOH data sent by a BMS system of each energy storage battery, and determining a selection threshold according to all acquired cycle times or SOH data;
and comparing the cycle times or SOH data corresponding to the energy storage batteries with the selected threshold value, and selecting the corresponding energy storage battery as a service battery according to the comparison result.
10. The household energy storage system battery management system of claim 9, wherein the management terminal determines the selection threshold by:
counting the circulation times or SOH data corresponding to all the energy storage batteries, and determining the median and standard deviation corresponding to the circulation times or SOH data;
and determining the selection threshold according to the median value and the standard deviation.
11. The battery management system of claim 9, wherein the management terminal is further configured to obtain the identification codes sent by the BMS systems, and send corresponding prompt information according to the identification codes sent by the BMS systems of the battery.
12. A household energy storage system battery management system as in claim 9, wherein the management terminal comprises:
selecting an energy storage battery with the cycle times smaller than the corresponding selection threshold value as an alternative battery, or selecting an energy storage battery with SOH data larger than the corresponding selection threshold value as an alternative battery;
acquiring the charge states corresponding to all the alternative batteries;
and matching the charge states corresponding to the alternative batteries with power supply conditions, and selecting the alternative batteries with the charge states meeting the power supply conditions as the power supply batteries.
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