CN116418095B - Low-temperature charging protection method, equipment and storage medium - Google Patents
Low-temperature charging protection method, equipment and storage medium Download PDFInfo
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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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
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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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
- H01M10/443—Methods for charging or discharging in response to temperature
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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
- 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
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The embodiment of the application discloses a low-temperature charging protection method, equipment and a storage medium, wherein the method comprises the following steps: acquiring a current SOC of a battery, a battery core predicted temperature list and a segmented power consumption schedule of each load; obtaining a predicted electric quantity change table according to the current SOC and the sectional power consumption schedule; determining a first time period for carrying out protective charging on the battery according to the estimated electric quantity change meter and the protective charging SOC; and according to the battery cell predicted temperature list, when the battery cell predicted temperature corresponding to the first time period is lower than the preset minimum charging working temperature, adjusting the sectional power utilization schedule based on a preset rule. The application can avoid the problem of low-temperature charging of the battery, thereby reducing the harm to the battery and prolonging the service life of the battery.
Description
Technical Field
The present application relates to the field of energy storage system control technologies, and in particular, to a low-temperature charging protection method, apparatus, and storage medium.
Background
In recent years, with the improvement of the social awareness of clean energy and the influence of globalization energy crisis, battery energy storage has been greatly developed, and battery energy storage also exposes a plurality of problems in the application process, namely, the problem of low-temperature battery charging.
In a typical energy storage system, the battery specification indicates a range of allowable discharge of the battery, for example, -20 to 60 ℃, and a range of charge of the battery, for example, 0 to 55 ℃. When the temperature of the battery cell is lower than the minimum charging working temperature, the system cannot supplement electricity to the battery. Meanwhile, the battery can continuously consume the electric quantity of the battery no matter the battery is in power supply loss or the battery itself has self-consumption phenomenon. When the battery power is low, the battery will not meet the discharge requirement, and further, serious faults of damaging the battery due to overdischarge of the battery may occur.
Disclosure of Invention
The embodiment of the application aims to provide a low-temperature charging protection method, low-temperature charging protection equipment and a storage medium, so as to solve the problems that a battery cannot be charged in time due to low temperature in the prior art, and the battery is over-discharged and damaged.
In order to solve the technical problems, the embodiment of the application provides the following technical scheme:
according to an aspect of the present application, there is provided a low-temperature charge protection method, the method including:
acquiring a current SOC of a battery, a battery core predicted temperature list and a segmented power consumption schedule of each load, wherein the segmented power consumption schedule comprises planned power consumption information corresponding to each time period of each load in a preset time period, and the battery core predicted temperature list comprises battery core predicted temperatures corresponding to each time period of the battery;
obtaining a predicted electric quantity change table according to the current SOC and the segmented power consumption schedule, wherein the predicted electric quantity change table comprises the predicted SOC of the battery corresponding to each time period;
determining a first time period for carrying out protective charging on the battery from the time periods according to the estimated electric quantity change table and a preset protective charging SOC;
and according to the battery cell predicted temperature list, if the battery cell predicted temperature corresponding to the first time period is lower than a preset minimum charging working temperature, the planning power utilization information corresponding to at least part of the time period from the current time period to the first time period (without the battery cell) of the segmented power utilization planning table is adjusted based on a preset rule so as to adjust the time for carrying out protective charging to a time period when the battery cell predicted temperature is not lower than the minimum charging working temperature.
Optionally, the method further comprises:
acquiring local air Wen Liebiao of a battery deployment site, current battery environment temperature and battery temperature rise data of the battery, wherein the local air Wen Liebiao comprises air temperature corresponding to each time period of the battery deployment site;
obtaining a battery environment temperature list according to the current battery environment temperature and the local gas Wen Liebiao, wherein the battery environment temperature list comprises battery environment temperatures corresponding to the batteries in all time periods;
and obtaining the battery core predicted temperature list according to the battery temperature rise data, the sectional power utilization schedule and the battery environment temperature list.
Optionally, the method further comprises:
acquiring self-consumption data of the battery;
and correcting the estimated SOC corresponding to each time period in the estimated electric quantity change table according to the self-consumption data.
Optionally, the method further comprises:
acquiring an initial power consumption plan of each load in the preset duration, wherein the initial power consumption plan comprises power, opening time and closing time of each load;
and obtaining the segmented electricity utilization schedule based on the initial electricity utilization schedule and a preset time interval.
Optionally, the step of determining the first period of time for performing protective charging on the battery from the periods of time according to the estimated electric quantity change table and a preset protective charging SOC includes:
and finding the earliest time period of which the estimated SOC is smaller than the protective charging SOC from the estimated electric quantity change table, and taking the earliest time period as the first time period for carrying out protective charging on the battery.
Optionally, the step of adjusting the planned electricity consumption information corresponding to at least part of the time period from the current time period to the first time period by the segmented electricity consumption schedule based on a preset rule includes:
setting planning electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule to a first preset value based on a preset first rule, wherein the first preset value is used for indicating that the battery is in a discharge inhibition state in the at least part of the time period; or alternatively, the process may be performed,
based on a preset second rule, the planned electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule is modified, so that the electric quantity output of the battery in the at least part of the time period is increased; or alternatively, the process may be performed,
and determining a second time period from the current time period to the first time period, wherein the predicted temperature of the battery core is higher than the lowest charging working temperature, based on a preset third rule, setting the planned electricity utilization information of the segmented electricity utilization schedule corresponding to the second time period to be a second preset value, wherein the second preset value is used for indicating that the battery is in a protective charging state in the second time period.
Optionally, the step of setting the planned electricity consumption information corresponding to at least a part of the time period from the current time period to the first time period of the segmented electricity consumption schedule to a first preset value based on a preset first rule includes:
step A: taking a time period which is positioned before the first time period and is closest to the first time period as a starting adjustment time period;
and (B) step (B): sequentially acquiring a time period from the beginning of the initial adjustment time period to the ending of the current time period as the current adjustment time period, modifying the planned electricity utilization information corresponding to the current adjustment time period in the segmented electricity utilization schedule into the first preset value, and updating the battery cell predicted temperature list and the estimated electric quantity change table based on the modification;
step C: a third time period for carrying out protective charging on the battery is redetermined according to the updated estimated electric quantity change table;
step D: if the predicted temperature of the battery cell corresponding to the third time period is lower than the lowest charging working temperature and the current adjustment time period is not the current time period, entering a step B, otherwise, entering a step E;
step E: and if the predicted temperature of the battery cell corresponding to the third time period is not lower than the minimum charging working temperature, outputting the modified segmented power utilization schedule.
Optionally, the step of determining, based on a preset third rule, a second period of time from the current period of time to the first period of time, where the predicted battery cell temperature is higher than the minimum charging operating temperature, includes:
selecting a time period which is closest to the current time period from the current time period to the first time period and corresponds to the battery cell predicted temperature higher than the lowest charging working temperature as the second time period.
According to a further aspect of the present application there is provided an electronic device comprising a memory, a processor and a computer program stored to run on the memory, the processor implementing the steps of any of the above described methods of low temperature charging protection when executing the program.
According to a further aspect of the present application there is provided a computer readable storage medium storing a computer program which, when executed by a processor, performs the steps of the low temperature charge protection method of any one of the above.
The embodiment of the application has the beneficial effects that: in the embodiment of the application, the current SOC of the battery, the battery core predicted temperature list and the sectional power consumption schedule of each load are firstly obtained, and the estimated electric quantity change table is obtained according to the current SOC of the battery and the sectional power consumption schedule; determining a first time period for carrying out protective charging on the battery according to the estimated electric quantity change table and a preset protective charging SOC; according to the battery cell predicted temperature list, when the battery cell predicted temperature corresponding to the first time period is lower than a preset minimum charging working temperature, the planned electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule is adjusted based on a preset rule, so that the time for carrying out protective charging is adjusted to a time period when the battery cell predicted temperature is not lower than the minimum charging working temperature. The application can avoid the problem of low-temperature charging of the battery, thereby reducing the harm to the battery and prolonging the service life of the battery.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic structural diagram of a photovoltaic energy storage system for a user according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a low-temperature charging protection method according to an embodiment of the application;
FIG. 3 is a schematic diagram of a refinement flow chart of a first adjustment method according to a first embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to a second embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In addition, the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
The following is explanatory information of terms appearing in the present application:
SOC: the battery is fully called State of Charge, the State of Charge of the battery is also called residual capacity, the ratio of the residual dischargeable capacity of the battery after the battery is used for a period of time or is placed for a long time and the electric capacity of the battery in a full Charge State is represented by common percentage;
protective charge SOC: the SOC value preset for avoiding the battery from being empty, when the battery SOC is lower than the value, the energy storage system is required to actively charge the battery in design;
minimum charge operating temperature: when the temperature of the battery cell is lower than the value, the battery is not allowed to be actively charged;
low temperature battery charging problem: the battery cell temperature is lower than the minimum charging working temperature, so that the battery cannot be charged in a protective way.
With the rapid development of new energy industry, energy storage systems have been more widely studied and applied. The energy storage system is equipment for storing energy, and can be applied to the field of new energy power generation such as photovoltaic, wind energy and the like. Referring to fig. 1, a schematic structural diagram of a photovoltaic energy storage system for a user according to an embodiment of the present application is shown. The energy storage system comprises a new energy power generation assembly represented by a photovoltaic assembly, a bidirectional converter (capable of performing DC/AC and AC/DC conversion) represented by an optical storage integrated inverter, a battery represented by a lithium battery PACK, a bidirectional DC/DC converter, a load (household appliances and the like) and a power grid. The new energy power generation assembly is connected with the first end of the bidirectional converter, and the battery is connected with the first end of the bidirectional converter through the bidirectional DC/DC converter; the second end of the bidirectional converter is connected with a load, and the second end is connected with a power grid after passing through an ammeter; in addition, the bidirectional converter is connected with each monitoring platform through communication modes such as Bluetooth or local area network. On the one hand, the photovoltaic component converts solar energy into direct current and then transmits the direct current to a battery (namely, photovoltaic charging is adopted) through a bidirectional converter and a bidirectional DC/DC converter; when the battery is fully charged, the redundant electric energy is transmitted to the power grid through the bidirectional converter. On the other hand, the bidirectional converter is connected with the power grid, converts alternating current conveyed by the power grid into direct current and conveys the direct current to the battery (namely, the power grid is adopted for charging). The battery supplies power to each household load (i.e. supplies power to the load) through the bidirectional DC/DC converter and the bidirectional converter. The bidirectional converter comprises an inverter circuit and a controller, wherein the controller controls the inverter circuit and the working mode of the battery based on the collected battery state information and the external setting information.
Example 1
According to the embodiment of the application, the low-temperature charging protection method is provided, and by combining the use expectation of a user side load, the temperature expectation in weather forecast, the battery self-consumption, the battery temperature rise parameter and other related data, whether the battery has a low-temperature charging problem at a certain time point in the future or not is predicted, if the low-temperature charging problem of the battery exists, the battery is controlled to actively inhibit the battery from discharging, actively charge the battery or actively discharge the battery, so that the low-temperature charging problem of the battery is avoided, and the harm to the battery is further reduced. It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Referring to fig. 2, fig. 2 is a flowchart illustrating a low-temperature charging protection method according to a first embodiment of the present application, where the method may be applied to a controller of the photovoltaic energy storage system or other energy storage systems shown in fig. 1, and the method specifically includes the following steps:
step S201, obtaining the current SOC of the battery, a battery core predicted temperature list and a segmented power utilization schedule of each load.
The sectional power utilization schedule comprises planned power utilization information corresponding to each load in each time period in a preset time period, and the battery cell predicted temperature list comprises battery cell predicted temperatures corresponding to the same time period of the battery in the same preset time period.
In one embodiment of the application, the segment electricity usage schedule may be obtained by: firstly, an initial power consumption plan of each load in a preset time period is obtained, wherein the initial power consumption plan comprises power, opening time and closing time of each load, and then the sectional power consumption plan is obtained based on the initial power consumption plan and a preset time interval.
Specifically, a user can set an initial electricity utilization plan of each load within a preset duration through a human-computer interface of the energy storage system, a mobile phone APP or Web. The electricity consumption plan in the preset time period can be any one of a daily plan, a weekly plan, a monthly plan and a conventional plan, and corresponds to a daily household load electricity consumption plan, a weekly household load electricity consumption plan, a monthly household load electricity consumption plan and a household load electricity consumption plan applicable to each day. For example, the preset duration corresponding to the daily schedule is 24 hours, and the household load electricity consumption conditions from 0 point to 24 points on the same day are included. The planned electricity utilization information of each load in each time period can be calculated based on the power and the service time of each load.
In some embodiments, for convenience of statistics, after average segmentation is performed on the preset time length according to the same time interval, average power consumption corresponding to each time period of each load in the preset time length is calculated according to the initial power consumption plan. The average electricity consumption information may be average electricity consumption power, average electricity consumption amount, or the like.
In other embodiments, the predetermined time period is segmented at different time intervals. For example, the time interval may be set smaller during periods when the load is in frequent use, and set larger during periods when the load is in less use.
In one embodiment of the application, the list of cell predicted temperatures may be obtained by: firstly, local air Wen Liebiao of a battery deployment place, the current battery environment temperature of the battery and battery temperature rise data of the battery are obtained, wherein the local air Wen Liebiao comprises air temperatures corresponding to all time periods of the battery deployment place within the preset time period; then, according to the current battery environment temperature and the local gas Wen Liebiao, a battery environment temperature list is obtained, wherein the battery environment temperature list comprises battery environment temperatures corresponding to the time periods of the battery within the preset duration; and finally, obtaining the battery cell predicted temperature list according to the battery temperature rise data, the sectional power consumption schedule and the battery environment temperature list.
Specifically, the controller of the energy storage system obtains weather forecast information of the battery deployment place through modes such as a mobile phone APP and a Web site, and segments the weather forecast information based on the same mode as a segmented electricity consumption schedule to obtain local air Wen Liebiao. Further from the current battery ambient temperature and the local gas Wen Liebiao, a corresponding list of battery ambient temperatures may be obtained, as described in more detail in the following examples.
When the battery is discharged, the temperature of the battery cell is increased, and further, the battery environment temperature list can be corrected by combining battery temperature increase data and a sectional power utilization schedule to obtain a battery cell predicted temperature list, wherein the battery cell predicted temperature is the temperature of the inside of the battery. For example, when the power consumption information is 1000W (the corresponding temperature is +3℃), the battery environment temperature is 20 ℃, and the predicted battery cell temperature corresponding to the time period is 23 ℃.
Step S202, obtaining a predicted electric quantity change table according to the current SOC and the segmented electricity consumption schedule.
The estimated electric quantity change table comprises estimated SOC (state of charge) corresponding to each time period of the battery in the preset time period.
In addition to power loss, the battery consumes power and causes a slow drop in power. In order to more accurately estimate the estimated SOC of the battery corresponding to each time period, preferably, the method further includes: acquiring self-consumption data of a battery; and correcting the estimated SOC corresponding to each time period in the estimated electric quantity change table according to the self-consumption data.
Step S203, determining a first period of time for performing protective charging on the battery from the periods of time according to the estimated electric quantity change table and a preset protective charging SOC.
In order to avoid the battery from being emptied, a protective charging SOC is preset in the application, and when the battery SOC is lower than the protective charging SOC, the energy storage system actively charges the battery, namely, the battery is subjected to protective charging through a power grid.
In one embodiment of the application, determining a first period of time for which to protectively charge the battery includes: and finding the earliest time period of which the estimated SOC is smaller than the protective charging SOC from an estimated electric quantity change table, and taking the earliest time period as the first time period for carrying out protective charging on the battery. For example, assuming a protective charge SOC of 5%, i.e., a remaining capacity of the battery of 5%, the protective charge will be automatically initiated by the energy storage system based on the design. The earliest time period of the estimated SOC less than 5% is found in the estimated electric quantity change table, and the energy storage system starts protective charging at the starting time of the earliest time period.
Step S204, according to the battery core predicted temperature list, if the battery core predicted temperature corresponding to the first time period is lower than a preset minimum charging operation temperature, the planned power consumption information corresponding to at least part of the time periods from the current time period to the first time period of the segmented power consumption schedule is adjusted based on a preset rule, so as to adjust the time for performing protective charging to a time period when the battery core predicted temperature is not lower than the minimum charging operation temperature.
Preferably, the current time period to the first time period include the current time period, but do not include the first time period. Specifically, whether the low-temperature charging problem exists in the first time period for protective charging is judged first, namely whether the predicted temperature of the battery core corresponding to the first time period is lower than the preset minimum charging working temperature or not, if yes, the low-temperature charging problem exists, and then the sectional power utilization schedule is adjusted. By adjusting the segment electricity consumption schedule, the time period for protective charging can be delayed or advanced to avoid low temperature charging problems. The following describes three adjustment methods of the sectional power consumption schedule:
the first adjustment method is as follows: and setting the planned electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule to a first preset value based on a preset first rule, wherein the first preset value is used for indicating that the battery is in a discharge inhibition state in the at least part of the time period. For example, when the planned power consumption information is average power consumption, the first preset value may be set to 0. When the controller acquires that the planned power consumption information corresponding to a certain time period is 0, the controller controls the battery to prohibit discharging in the time period.
The second adjustment method is as follows: and based on a preset second rule, modifying planning electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule, so that the electric quantity output of the battery in the at least part of the time period is increased. For example, when the planned electricity information is average electricity power and the planned electricity information corresponding to a certain time period is 0, after the planned electricity information is modified to 4000, when the controller obtains the planned electricity information corresponding to the time period, the controller controls the battery to discharge in the time period.
The third adjustment method is as follows: and determining a second time period from the current time period to the first time period, wherein the predicted temperature of the battery core is higher than the lowest charging working temperature, based on a preset third rule, setting the planned electricity utilization information of the sectional electricity utilization schedule corresponding to the second time period to be a second preset value, wherein the second preset value is used for indicating that the battery is in a protective charging state in the second time period. For example, when the planned electricity usage information is average electricity usage power, the second preset value may be set to a negative number. When the controller obtains that the planned electricity utilization information corresponding to a certain time period is negative, the controller controls the battery to perform protective charging in the time period.
In one embodiment of the present application, the step of determining, based on a preset third rule, a second period of time between the current period of time and the first period of time, in which the predicted battery cell temperature is higher than the minimum charging operation temperature, includes: and selecting a time period which is closest to the current time period from the current time period to the first time period and corresponds to the battery cell predicted temperature which is higher than the lowest charging working temperature as the second time period.
Referring to fig. 3, a detailed flow chart of a first adjustment method according to an embodiment of the present application specifically includes the following steps:
step 301, taking a time period which is positioned before and closest to a first time period as a starting adjustment time period;
step 302, sequentially obtaining a time period from the beginning of the initial adjustment time period to the ending of the current time period as the current adjustment time period, modifying the planned electricity utilization information corresponding to the current adjustment time period in the segmented electricity utilization schedule into the first preset value, and updating the battery cell predicted temperature list and the estimated electric quantity change table based on the modification;
step 303, re-determining a third time period for performing protective charging on the battery according to the updated estimated electric quantity change table;
step 304, judging whether the predicted temperature of the battery cell corresponding to the third time period is lower than the lowest charging working temperature, if yes, entering step 305, otherwise, entering step 306;
step S305, judging whether the current adjustment time period is the current time period, if yes, ending, otherwise, entering step S302;
and step 306, outputting the modified segmented electricity utilization schedule.
The third time period obtained at this time is the time period for protective charging after adjustment.
The above three adjustment method embodiments may be implemented by one or a combination of the above three adjustment method embodiments. When the method is combined with implementation, the first adjusting method is preferably adopted, and if the problem of low-temperature battery charging still exists after the planned electricity consumption of all time periods from the current time period to the first time period is canceled based on the first adjusting method, the second adjusting method or the third adjusting method is selected. It should be noted that, if the problem of low-temperature charging of the battery cannot be avoided based on the first adjustment method occurs frequently in the energy storage system, it is indicated that the current energy storage system may not meet the requirement of the installation environment, and the controller may send a prompt to suggest the user to select the energy storage system with the lower charging temperature characteristic.
In the embodiment of the application, whether the battery has low-temperature charging problem in the future is predicted based on the current SOC of the battery, a battery core predicted temperature list, a segmented power consumption schedule of each load and other information, and if the battery has the low-temperature charging problem, the segmented power consumption schedule is adjusted, so that the controller controls the battery to actively inhibit the battery from discharging in certain time periods, actively charge the battery in certain time periods or actively discharge the battery in certain time periods based on the adjusted segmented power consumption schedule, thereby avoiding the occurrence of the low-temperature charging problem of the battery and reducing the harm to the battery.
In order to more clearly illustrate the low-temperature charging protection method provided by the application, a detailed description is given below through a specific embodiment.
Let the current time be 0 point, the preset time interval be 1 hour, and the local air Wen Liebiao T0 of 13 hours in the future be as shown in the following table 1:
TABLE 1
Assuming that the current battery ambient temperature is 5 ℃ and lower than the current air temperature of 7 ℃, from the corresponding relationship between the current battery ambient temperature and the current air temperature (battery ambient temperature=t0×5/7), a battery ambient temperature list T1 (the value of T1 is a rounded value) for 13 hours can be obtained, as shown in the following table 2:
TABLE 2
The segment electricity usage schedule from time 0 is shown in table 3 below:
TABLE 3 Table 3
The planned power consumption information corresponding to each time period is average power consumption.
The battery temperature rise data are shown in table 4 below:
TABLE 4 Table 4
Based on tables 3 and 4, the temperature rise effect of the user's planned electricity can be obtained as shown in the following table 5:
TABLE 5
From tables 2 and 5, a list of cell predicted temperatures T2 is obtained as shown in table 6 below:
TABLE 6
Assuming that the current SOC of the battery is 10, the total electric quantity of the battery is 100kwh, that is, the current electric quantity of the battery is 10kwh, and the self-consumption electric power is 3w, the estimated electric quantity change table can be obtained by combining the sectional power consumption schedule table of table 3, as shown in the following table 7:
TABLE 7
Let the protective charge SOC be 5 and the minimum charge operating temperature be 0 ℃. As can be seen from table 7, when the time is 8, the battery SOC is 4, and protective charging is required. Further looking up table 6 shows that the predicted temperature of the corresponding cell at 8 is-2 ℃, according to the adjustment method in the embodiment of fig. 3, the planned electricity consumption information at the time period 7 nearest to 8 is set to 0, and the modified segmented electricity consumption schedule is shown in table 8 below:
TABLE 8
Based on the modified sectional power consumption schedule, corresponding temperature rise information is obtained as shown in the following table 9:
TABLE 9
Updating a battery cell predicted temperature list based on the temperature rise information of table 9, wherein the updated battery cell predicted temperature list is shown in the following table 10:
table 10
Based on the modified segmented electricity consumption schedule, an estimated electricity quantity change table is updated, and the updated estimated electricity quantity change table is shown in the following table 11:
TABLE 11
According to the updated estimated electric quantity change table, when the time is 13, the SOC of the battery is less than 5, the battery needs to be charged in a protective way, and at the moment, the predicted temperature of the battery core is 9 ℃, so that the problem of low-temperature charging does not occur.
The low-temperature charging protection method provided by the embodiment of the application comprises the steps of firstly obtaining a current SOC of a battery, a battery core predicted temperature list and a segmented power consumption schedule of each load, and obtaining a predicted electric quantity change table according to the current SOC of the battery and the segmented power consumption schedule; determining a first time period for carrying out protective charging on the battery according to the estimated electric quantity change table and a preset protective charging SOC; according to the battery cell predicted temperature list, when the battery cell predicted temperature corresponding to the first time period is lower than a preset minimum charging working temperature, the planned electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule is adjusted based on a preset rule, so that the time for carrying out protective charging is adjusted to a time period when the battery cell predicted temperature is not lower than the minimum charging working temperature. The application can avoid the problem of low-temperature charging of the battery, thereby reducing the harm to the battery and prolonging the service life of the battery.
Example two
According to an embodiment of the present application, as shown in fig. 4, an electronic device is provided, which is an optional structural schematic diagram of an electronic device according to a third embodiment of the present application, and the electronic device may include a processor 401, a communication interface 402, a memory 403, and a communication bus 404, where the processor 401, the communication interface 402, and the memory 403 complete communication with each other through the communication bus 404. The processor 401 may invoke logic instructions in the memory 403 to perform a low temperature charge protection method comprising: acquiring a current SOC of a battery, a battery core predicted temperature list and a segmented power consumption schedule of each load, wherein the segmented power consumption schedule comprises planned power consumption information corresponding to each time period of each load in a preset time period, and the battery core predicted temperature list comprises battery core predicted temperatures corresponding to each time period of the battery in the preset time period; obtaining a predicted electric quantity change table according to the current SOC and the segmented power consumption schedule, wherein the predicted electric quantity change table comprises predicted SOCs of the battery corresponding to the time periods within the preset duration; determining a first time period for carrying out protective charging on the battery from the time periods according to the estimated electric quantity change table and a preset protective charging SOC; and according to the battery cell predicted temperature list, if the battery cell predicted temperature corresponding to the first time period is lower than a preset minimum charging working temperature, the planned power utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented power utilization schedule is adjusted based on a preset rule, so that the time for carrying out protective charging is adjusted to a time period when the battery cell predicted temperature is not lower than the minimum charging working temperature.
Furthermore, the logic instructions in the memory 403 may be implemented in the form of software functional units and stored in several computer-readable storage media when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in the first embodiment of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The product may perform the low-temperature charging protection method according to any one of the embodiments, and has the corresponding functional module and beneficial effects of the method, and technical details not described in detail in this embodiment may be referred to the low-temperature charging protection method provided in the first embodiment of the present application.
Example III
According to an embodiment of the present application, there is provided a computer-readable storage medium of the type described in embodiment two, the computer-readable storage medium storing a computer program which, when executed by a processor, performs the steps of the low-temperature charge protection method described in embodiment one.
The product may perform the low-temperature charging protection method according to any one of the embodiments, and has the corresponding functional module and beneficial effects of the method, and technical details not described in detail in this embodiment may be referred to the low-temperature charging protection method provided in the first embodiment of the present application.
From the above description of embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus a general purpose hardware platform, or may be implemented by hardware. Based on such understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the related art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for up to a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as described above, which are not provided in detail for the sake of brevity; although the application 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 technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (9)
1. A method of low temperature charge protection, the method comprising:
acquiring a current SOC of a battery, a battery core predicted temperature list and a segmented power consumption schedule of each load, wherein the segmented power consumption schedule comprises planned power consumption information corresponding to each time period of each load in a preset time period, and the battery core predicted temperature list comprises battery core predicted temperatures corresponding to each time period of the battery;
obtaining a predicted electric quantity change table according to the current SOC and the segmented power consumption schedule, wherein the predicted electric quantity change table comprises the predicted SOC of the battery corresponding to each time period;
determining a first time period for carrying out protective charging on the battery from the time periods according to the estimated electric quantity change table and a preset protective charging SOC;
according to the battery cell predicted temperature list, if the battery cell predicted temperature corresponding to the first time period is lower than a preset minimum charging working temperature, the planned power consumption information corresponding to at least part of the time period from the current time period to the first time period of the segmented power consumption schedule is adjusted based on a preset rule, so that the time for carrying out protective charging is adjusted to a time period when the battery cell predicted temperature is not lower than the minimum charging working temperature;
the step of adjusting the planned electricity consumption information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity consumption schedule based on the preset rule comprises the following steps:
setting planning electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule to a first preset value based on a preset first rule, wherein the first preset value is used for indicating that the battery is in a discharge inhibition state in the at least part of the time period; or alternatively, the process may be performed,
based on a preset second rule, the planned electricity utilization information corresponding to at least part of the time period from the current time period to the first time period of the segmented electricity utilization schedule is modified, so that the electric quantity output of the battery in the at least part of the time period is increased; or alternatively, the process may be performed,
and determining a second time period from the current time period to the first time period, wherein the predicted temperature of the battery core is higher than the lowest charging working temperature, based on a preset third rule, setting the planned electricity utilization information of the segmented electricity utilization schedule corresponding to the second time period to be a second preset value, wherein the second preset value is used for indicating that the battery is in a protective charging state in the second time period.
2. The method according to claim 1, wherein the method further comprises:
acquiring local air Wen Liebiao of a battery deployment site, current battery environment temperature and battery temperature rise data of the battery, wherein the local air Wen Liebiao comprises air temperature corresponding to each time period of the battery deployment site;
obtaining a battery environment temperature list according to the current battery environment temperature and the local gas Wen Liebiao, wherein the battery environment temperature list comprises battery environment temperatures corresponding to the batteries in all time periods;
and obtaining the battery core predicted temperature list according to the battery temperature rise data, the sectional power utilization schedule and the battery environment temperature list.
3. The method according to claim 1, wherein the method further comprises:
acquiring self-consumption data of the battery;
and correcting the estimated SOC corresponding to each time period in the estimated electric quantity change table according to the self-consumption data.
4. The method according to claim 1, wherein the method further comprises:
acquiring an initial power consumption plan of each load in the preset duration, wherein the initial power consumption plan comprises power, opening time and closing time of each load;
and obtaining the segmented electricity utilization schedule based on the initial electricity utilization schedule and a preset time interval.
5. The method of claim 1, wherein the step of determining a first time period for protectively charging the battery from the time periods according to the estimated charge level variation table and a preset protective charge SOC comprises:
and finding the earliest time period of which the estimated SOC is smaller than the protective charging SOC from the estimated electric quantity change table, and taking the earliest time period as the first time period for carrying out protective charging on the battery.
6. The method according to any one of claims 1 to 5, wherein the step of setting the planned electricity usage information of the segment electricity usage schedule corresponding to at least a part of the current time period to the first time period to a first preset value based on a preset first rule includes:
step A: taking a time period which is positioned before the first time period and is closest to the first time period as a starting adjustment time period;
and (B) step (B): sequentially acquiring a time period from the beginning of the initial adjustment time period to the ending of the current time period as the current adjustment time period, modifying the planned electricity utilization information corresponding to the current adjustment time period in the segmented electricity utilization schedule into the first preset value, and updating the battery cell predicted temperature list and the estimated electric quantity change table based on the modification;
step C: a third time period for carrying out protective charging on the battery is redetermined according to the updated estimated electric quantity change table;
step D: if the predicted temperature of the battery cell corresponding to the third time period is lower than the lowest charging working temperature and the current adjustment time period is not the current time period, entering a step B, otherwise, entering a step E;
step E: and if the predicted temperature of the battery cell corresponding to the third time period is not lower than the minimum charging working temperature, outputting the modified segmented power utilization schedule.
7. The method according to any one of claims 1 to 5, wherein the step of determining a second period of time between the current period of time and the first period of time, in which the cell predicted temperature is higher than the minimum charging operating temperature, based on a preset third rule, comprises:
selecting a time period which is closest to the current time period from the current time period to the first time period and corresponds to the battery cell predicted temperature higher than the lowest charging working temperature as the second time period.
8. An electronic device comprising a memory, a processor and a computer program stored to run on the memory, characterized in that the processor implements the steps of the low temperature charge protection method of any of claims 1-7 when the program is executed by the processor.
9. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, performs the steps of the low temperature charge protection method according to any one of claims 1-7.
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