CN115622199B - Charging method and device of battery system - Google Patents
Charging method and device of battery system Download PDFInfo
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- CN115622199B CN115622199B CN202211535940.1A CN202211535940A CN115622199B CN 115622199 B CN115622199 B CN 115622199B CN 202211535940 A CN202211535940 A CN 202211535940A CN 115622199 B CN115622199 B CN 115622199B
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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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- 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
- H01M10/441—Methods for charging or discharging 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
- 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 charging method and a charging device of a battery system, which can determine a charging cut-off parameter according to the electric quantity consumed by the battery system in the current preset reset period, wherein the charging cut-off parameter takes effect in the next preset reset period, so that the newly determined charging cut-off parameter is adopted to charge the battery system in the next preset reset period, the charged electric quantity is closer to the consumed electric quantity, the problem of energy redundancy is avoided, the battery system is prevented from being in a higher SOC state after charging is finished, the storage of the battery system under low SOC is realized, and the aim of prolonging the service life of the battery system is finally fulfilled.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a method and an apparatus for charging a battery system.
Background
According to incomplete statistics, the storage (namely, the non-charging and discharging state) time of a lithium ion battery system in 10 years of the wind and light energy storage power station is about 7.5 years, the storage time of the battery system in 10 years of private car users is about 6 years, and the storage time of the battery system in 10 years of the hybrid electric power ship is about 6.5 years. In the full life cycle application of the product, the storage time of the battery system accounts for about 60% of the working life of the full life cycle, and the capacity consumption during storage accounts for about 1/3 of the total capacity consumption. Also, when testing the battery system, it was found that, after the battery system was stored at 25 ℃ for half a year, the capacity fade was 0.55% SOH (battery state of health, i.e., capacity retention) more when stored at 100% SOC than when stored at 50% SOC, indicating that the battery system can reduce the SOH fade when stored at low SOC, and that the battery system can extend its operating life when stored at low SOC because the operating life of the battery system is mainly limited by the battery life.
Also, currently the lithium battery industry generally defines: the end-of-life SOH (i.e., SOHy) of the battery system is 80% or 70% of the SOH at the beginning of use. Therefore, in order to meet the use requirement of a user at the end of the service life of a product, the design energy of the battery system is the ratio of the required energy of the user to the SOHy; for example, the energy required by the user is represented by a, the design energy of the battery system is a/SOHy, so that the battery system is charged only when the energy reaches a/SOHy during each charging, but the energy required by the user is a, so that a part of energy (i.e., a/SOHy-a) remains after the user uses the battery system, and energy redundancy is high; and if the user does not use the battery system in time after the charging is finished, the battery system is in a higher SOC state, and the service life of the battery is reduced when the battery system is stored in the state.
Therefore, how to ensure the user's usage requirement and realize the storage of the battery system under low SOC to finally achieve the purpose of prolonging the service life of the battery system is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a charging method and a charging device of a battery system, which are used for ensuring the use requirements of users, realizing the storage of the battery system under the low SOC and finally achieving the purpose of prolonging the service life of the battery system.
In a first aspect, an embodiment of the present invention provides a charging method for a battery system, including:
determining a charge cut-off parameter according to the electric quantity consumed by the battery system in the current preset reset period;
and charging the battery system in the next preset reset period by adopting the determined charging ending parameter, and finishing charging when the charging parameter of the battery system reaches the determined charging ending parameter.
In a second aspect, an embodiment of the present invention provides a charge control device for a battery system, including:
a memory for storing program instructions;
and the processor is used for calling the program instructions stored in the memory and executing the charging method provided by the embodiment of the invention according to the obtained program.
In a third aspect, an embodiment of the present invention provides an electrical device, including: the invention also provides a battery system and the charging control device.
In a fourth aspect, the present invention provides a readable storage medium storing instructions executable by a charging control device, where the instructions are used to enable the charging control device to perform the above charging method according to the embodiment of the present invention.
The invention has the following beneficial effects:
according to the charging method and the charging device for the battery system, provided by the embodiment of the invention, the charge cut-off parameter can be determined according to the electric quantity consumed by the battery system in the current preset reset period, and the charge cut-off parameter takes effect in the next preset reset period, so that the battery system is charged by adopting the latest determined charge cut-off parameter in the next preset reset period, the charged electric quantity is close to the consumed electric quantity (namely the power consumption requirement of a user), the problem of energy redundancy is avoided, the battery system can be prevented from being in a higher SOC state after charging is finished, the storage of the battery system under a low SOC state is realized, and the purpose of prolonging the service life of the battery system is finally achieved.
Drawings
Fig. 1 is a flowchart of a charging method according to an embodiment of the present invention;
FIG. 2 is a flow chart of an embodiment provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a charging control apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electric device provided in an embodiment of the present invention.
Detailed Description
The following describes an embodiment of a charging method and apparatus for a battery system according to an embodiment of the present invention in detail with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a charging method, as shown in fig. 1, which may include:
s101, determining a charge cut-off parameter according to the electric quantity consumed by the battery system in the current preset reset period;
and S102, charging the battery system in the next preset reset period by adopting the determined charging ending parameter, and ending the charging when the charging parameter of the battery system reaches the determined charging ending parameter.
Therefore, the charge ending parameter can be determined according to the electric quantity consumed by the battery system in the current preset reset period, and the charge ending parameter takes effect in the next preset reset period, so that in the next preset reset period, the battery system is charged by adopting the newly determined charge ending parameter, the charged electric quantity is close to the consumed electric quantity (namely the power consumption requirement of a user), the problem of energy redundancy is avoided, the battery system can be prevented from being in a higher SOC state after charging is finished, the battery system is stored in a low SOC state, and the purpose of prolonging the service life of the battery system is finally achieved.
In some embodiments, a plurality of preset reset periods may be set, and each time the preset reset period is reached, a charge cut-off parameter may be determined by using the step S101, and becomes effective in the next preset reset period; and, when the first preset reset period has not been reached, the charging may be performed using the preset initial charge cutoff parameter.
For example, from the initial time to the arrival time of the first preset reset period, the battery system is charged by using the initial charge cut-off parameter; determining a charge cutoff parameter (namely A1) when a first preset reset period is reached;
charging the battery system by adopting A1 from the arrival time of the first preset reset period to the arrival time of the second preset reset period; determining a charge cutoff parameter (i.e., A2) when a second predetermined reset period is reached;
charging the battery system by adopting A2 from the arrival time of the second preset reset period to the arrival time of the third preset reset period; when a third preset reset period is reached, determining a charge cutoff parameter (namely A3);
and so on.
Therefore, the charging cut-off parameter can be dynamically adjusted according to the use habits of users in different time periods, so that the charged electric quantity is matched with the required electric quantity all the time, the electric quantity redundancy is effectively avoided, the storage of the battery system under the low SOC is facilitated, and the purpose of prolonging the service life of the battery system is finally achieved.
In some embodiments, the preset reset period may be set according to an application scenario of the battery system, a user's usage habit, and the like, which are not limited herein.
For example, when the battery system is used in an energy storage station or an electric ship, the time for one operation is long, so that the preset reset period can be set to be longer; when the battery system is used for the electric vehicle, the habit of using the battery system is not too regular, and the user often goes to various places with different distances, the time for operating once is short, but the operation frequency in short time is high, the operation conditions are various, and the preset reset period can be set to be longer; when the battery system is used for the electric vehicle, the habit of the user is fixed, and the user goes to a fixed place every day, the preset reset period can be set to be shorter.
In some embodiments, the preset reset period may not be set, but after the battery system operates for a period of time, the charge cut-off parameter is determined according to the amount of electricity consumed by the battery system during the period of time, and the charge cut-off parameter is used for charging in the subsequent use process.
Thus, the calculation amount and the processing amount of the charging control device can be reduced, the power consumption of the charging control device is reduced, and the power consumption of the electric equipment is reduced. In this case, the charge cut-off parameter is dynamically adjusted as an example.
The following describes an implementation procedure of the above step S101.
In some embodiments, the preset reset period may include n preset collection periods, where n is an integer greater than 1, and each preset collection period corresponds to an electricity consumption parameter for representing an amount of electricity consumed by the battery system in the preset collection period; in order to implement the step S101, the method may include:
step 1.1, finding out an extreme value from n power utilization parameters of a current preset reset period;
and step 1.2, adjusting the charging cut-off parameter corresponding to the current preset reset period according to the found extreme value and the size of the preset parameter safety lower limit, and taking the adjusted charging cut-off parameter as the charging cut-off parameter of the next preset reset period.
Therefore, the electric quantity consumed by the battery system in the current preset reset period can be determined based on the extreme value of the electricity utilization parameter, and the charge ending parameter corresponding to the current preset reset period is adjusted, so that the charge ending parameter corresponding to the current preset reset period is updated, the charged electric quantity is favorably matched with the electric quantity required by a user, electric quantity redundancy is avoided, meanwhile, the battery system can be prevented from being stored under a higher SOC, and the service life of the battery system is prolonged.
Of course, in some embodiments, to implement step S101 described above, the following process may also be adopted:
and calculating the sum of the power consumption parameters corresponding to each preset acquisition period in the current preset reset period, and determining the consumed electric quantity of the battery system in the current preset reset period based on the sum.
Therefore, the charging cut-off parameter can be directly, quickly and effectively determined in the current preset reset period, so that the calculation amount of the charging control device is reduced, and the power consumption of the charging control device is reduced.
In some embodiments, the power consumption parameter corresponding to each preset collection period and indicating the power consumed by the battery system in the preset collection period may be determined in several ways:
mode 1: based on manually entered data.
When the preset acquisition period is reached, the following processes are executed:
and 1, determining the discharge energy of the battery system according to the electricity utilization data input by a user through remote control.
In some embodiments, to implement process 1, may include:
when the battery system is applied to an energy storage station or an electric ship, the battery system comprises a plurality of battery clusters, each battery cluster comprises a plurality of battery strings, and when the electricity consumption data input by a user is discharge energy (also called input energy), the discharge energy of the battery system is the ratio of the input energy to the energy efficiency of an inverter in the energy storage station or the electric ship; the energy efficiency of inverters of different electric devices is different;
when the battery system is applied to an electric vehicle, the battery system comprises a battery cluster, the battery system comprises a plurality of battery strings, and when the electricity consumption data input by a user is driving mileage, the discharge energy of the battery system is the product of the driving mileage and a hundred kilometers energy consumption index; wherein, the hundred kilometers energy consumption index can be understood as: the amount of power consumed by one hundred kilometers of travel.
In some embodiments, the preset acquisition period may be determined according to a battery system application scenario, which is not limited herein.
For example, when the battery system is applied to an energy storage station or an electric ship, since the time for operating the energy storage station or the electric ship once may be long, the preset acquisition period may be set as: the time required by one-time operation is set to be one day, two days or more, or the like, or is the time interval from the end of the current charging to the start of the next charging;
when the battery system is applied to the electric vehicle, the electric vehicle is used more flexibly, the running times of each day are more, the running time of each time is different, the electric vehicle can run in most of the time in the day, and the electric vehicle is basically in a non-running state at night, so that the preset collection period can be set to be one day.
In some embodiments, when the battery system is applied to an energy storage station or an electric ship, the input energy may be understood as: the discharge energy from the last preset collection period to the current preset collection period.
And 2, determining the discharge capacity of the battery system according to the discharge energy, the discharge voltage of the single batteries included in the battery system and the number of battery strings included in the battery system.
In some embodiments, to implement process 2, may include:
when the battery system is applied to an energy storage station or an electric ship, and the battery system comprises a plurality of battery clusters, taking the ratio of the discharge energy of the battery system to the number of the battery clusters comprised by the battery system as the discharge energy of a single battery cluster; calculating the discharge capacity of the single battery cluster by using a relation 1 (namely the discharge capacity of the single battery cluster = the discharge energy of the single battery cluster/(the discharge voltage of the single battery x the number of battery strings included in the single battery cluster)); taking the calculated discharge capacity of the single battery cluster as the discharge capacity of the battery system;
when the battery system is applied to an electric vehicle, the battery system is a single battery cluster, the discharge capacity of the battery system is calculated using the relation 2 (i.e., the discharge capacity of the battery system = discharge energy of the battery system/(discharge voltage of the unit battery × the number of battery strings included in the battery system)).
In some embodiments, the discharge voltage of a cell may be understood as: and when the single battery discharges from 100% SOC to 0% SOC under the maximum discharge power of the battery system, the ratio of the discharge energy to the discharge capacity of the single battery is obtained.
And 3, determining the power utilization parameters of the battery system according to the discharge capacity, the rated capacity of the battery system and the current SOH of the battery system.
In some embodiments, when the power usage parameter is the SOC of the battery system consumed upon discharge, the power usage parameter of the battery system = the discharge capacity of the battery system/(rated capacity of the battery system × current SOH of the battery system);
when the electricity utilization parameter is the voltage consumed by the battery system during discharging, the SOC consumed by the battery system during discharging is calculated based on the discharge capacity/(the rated capacity of the battery system multiplied by the current SOH of the battery system) of the battery system, and then the voltage corresponding to the SOC consumed by the battery system during discharging is determined based on the OCV-SOC curve.
Of course, in some embodiments, in the mode 1, the power utilization parameter may also be a remaining SOC or a remaining voltage of the battery system after the discharge, and the remaining SOC or the remaining voltage may be calculated based on the determined SOC or voltage consumed by the battery system during the discharge and the SOC or voltage of the battery system at the discharge start time.
Mode 2: based on the automatically acquired data.
In some embodiments, when the power usage parameter is a remaining SOC or a remaining voltage of the battery system after discharging, the power usage parameter may be directly read from the battery management system.
Of course, in some embodiments, in the mode 2, the power consumption parameter may also be the SOC or the voltage consumed by the battery system during discharging, and the consumed SOC or the voltage may be calculated based on the determined remaining SOC or remaining voltage of the battery system after discharging.
In a word, in specific implementation, the mode 1 or the mode 2 can be selected to determine the power utilization parameters according to actual needs, so as to meet the needs of different application scenarios, and improve the flexibility of design.
The following description will be made based on the difference in the power consumption parameter.
1. The power consumption parameter is the SOC or voltage consumed by the battery system during discharging.
In some embodiments, the step 1.1 may specifically include: finding out a maximum value from n power utilization parameters of a current preset reset period;
the step 1.2 may specifically include: and adjusting the charge cut-off parameter corresponding to the current preset reset period based on the sum of the maximum value and the parameter safety lower limit.
During specific implementation, the sum of the maximum value and the parameter safety lower limit can be used as the adjusted charge cut-off parameter; or, a safety redundancy, that is, the sum of the maximum value, the parameter safety lower limit and the safety redundancy can be set as the adjusted charge cut-off parameter.
For example, taking the charge cut-off parameter as the charge cut-off SOC, the parameter safety lower limit as the SOC safety lower limit, and the maximum value as the maximum SOC, the safety redundancy may be set to 5% of the charge cut-off SOC (of course, not limited to 5%, but may also be 8%, 10%, etc.), and then: the adjusted charge cutoff SOC = charge cutoff SOC + SOC lower safety limit + 5% of charge cutoff SOC.
Further, according to actual tests, it is found that, when the user uses 40Kwh of electricity per day, if the amount of electricity discharged when the SOC of the battery system is discharged from 50% to 0% is 40Kwh, the battery system may be charged to 55% at the time of charging.
Therefore, when the power utilization parameter is the SOC or the voltage consumed by the battery system during discharging, the maximum energy consumed by the battery system during use can be determined, and then the charging cut-off parameter is adjusted based on the maximum energy, so that the adjusted charging cut-off parameter can be matched with the energy consumed by the battery system, and meanwhile, the problem that the battery system is unsafety caused by too low energy in the use process of the battery system can be avoided.
2. The power utilization parameter is the remaining SOC or the remaining voltage of the battery system after discharging.
In some embodiments, the step 1.1 may specifically include: and finding out the minimum value from the n power utilization parameters of the current preset reset period. Therefore, the remaining minimum energy of the battery system in use can be determined, and the charging cut-off parameter is adjusted based on the size relation between the minimum energy and the parameter safety lower limit, so that the maximum requirement of a user can be met after charging is carried out based on the adjusted charging cut-off parameter, and the condition that the electric quantity of the battery system is insufficient when the user uses the battery system is avoided.
In some embodiments, the step 1.2 may specifically include:
step 1.2.1, judging whether the minimum value is smaller than the lower limit of the parameter safety; if yes, executing step 1.2.2; if not, executing the step 1.2.3;
step 1.2.2, calculating a difference value between the parameter safety lower limit and the minimum value, and adjusting a charge cut-off parameter corresponding to the current preset reset period based on the sum of the difference value and the parameter safety lower limit;
in step 1.2.2, the sum of the difference and the parameter safety lower limit may be used as the adjusted charge cut-off parameter; or, a safety redundancy can be set, that is, the sum of the difference, the parameter safety lower limit and the safety redundancy is used as the adjusted charge cut-off parameter.
Step 1.2.3, judging whether the minimum value is higher than a preset ratio of the lower safety limit of the parameters; if yes, executing step 1.2.4; if not, executing the step 1.2.5;
the preset ratio may be determined according to actual needs, for example, but not limited to, 5% or 8%, and the like, and is not limited herein.
Step 1.2.4, adjusting a charge cut-off parameter corresponding to the current preset reset period based on a preset proportion;
in some embodiments, this step 1.2.4 may specifically include:
and when the charge cut-off parameter is the charge cut-off SOC, adjusting the charge cut-off parameter corresponding to the current preset reset period based on the difference value between the charge cut-off SOC corresponding to the current preset reset period and the preset proportion.
The difference value between the charging cut-off SOC corresponding to the current preset reset period and the preset proportion can be used as the adjusted charging cut-off parameter; or, a safety redundancy may also be set, that is, a difference between the charging cut-off SOC corresponding to the current preset reset period and the preset ratio and a sum of the safety redundancy are used as the adjusted charging cut-off parameter.
Therefore, the minimum value is higher than the preset ratio of the parameter safety lower limit and represents that the maximum consumption of the battery system is higher than the parameter safety lower limit, so that electric quantity redundancy can occur when charging is carried out according to the current charging cut-off parameter, and then the charging cut-off parameter can be adjusted based on the difference value of the charging cut-off SOC corresponding to the current preset reset period and the preset ratio, so that the electric quantity redundancy is avoided, meanwhile, the power consumption requirement of a user can be guaranteed, in addition, the condition that the battery system is in a higher SOC state after charging is finished can be avoided, and the service life of the battery system is prolonged.
And step 1.2.5, keeping the charge cut-off parameter corresponding to the current preset reset period unchanged.
Therefore, through the steps 1.2.1 to 1.2.5, the charge cut-off parameter can be adjusted based on the magnitude relation between the minimum value and the parameter safety lower limit, so that electric quantity redundancy during charging is avoided, the power consumption requirement of a user can be ensured, meanwhile, the risk caused by too low electric quantity of the battery system can be avoided, and the use safety of the battery system is improved; and the battery system can be prevented from being in a higher SOC state after charging is finished, and the service life of the battery system is prolonged.
In some embodiments, in the process of performing step 1.2.1 to step 1.2.5, the method may further include:
when the current preset reset period is reached, the first counting value is increased by one;
and resetting the first count value when adjusting the charge cut-off parameter corresponding to the current preset reset period.
Whether the charging cut-off parameter corresponding to the current preset reset period is adjusted based on the preset proportion or the charging cut-off parameter corresponding to the current preset reset period is adjusted based on the sum of the difference value and the parameter safety lower limit, the first count value needs to be cleared.
And, can also include:
when the minimum value is higher than the preset proportion of the lower parameter safety limit, adding one to the second counting value;
before adjusting the charge cut-off parameter corresponding to the current preset reset period based on the preset proportion, determining that the first count value and the second count value are both n;
and resetting the second count value when the charge cut-off parameter corresponding to the current preset reset period is adjusted based on the preset proportion.
In this way, by adjusting the values of the first count value and the second count value, when the minimum value for n consecutive times is higher than the preset ratio of the parameter safety lower limit, the charge cut-off parameter corresponding to the current preset reset period is adjusted based on the preset ratio; therefore, the charging cut-off parameter can be adjusted based on the power consumption requirements of the user within a long period of time, the adjustment times of the charging cut-off parameter are increased when the power consumption requirements within a certain preset reset period or certain preset reset periods are suddenly changed and the user requirements within other preset reset periods are kept unchanged, the power consumption requirements of the user are met, the adjustment times are reduced, and the power consumption of the charging control device is reduced.
In some embodiments, it may further include:
when the first count value is n and the second count value is not n, resetting the first count value and the second count value, and keeping the charge cut-off parameter corresponding to the current preset reset period unchanged;
and when the first count value is not n, keeping the first count value and the second count value unchanged, and keeping the charge cut-off parameter corresponding to the current preset reset period unchanged.
That is to say, when the first count value and the second count value are not n at the same time, the condition that the minimum value is higher than the preset ratio of the parameter safety lower limit n times continuously is not satisfied, at this time, the charging cut-off parameter does not need to be adjusted, the charging cut-off parameter corresponding to the current preset reset period is kept unchanged, and meanwhile, the first count value and the second count value are correspondingly adjusted, so that whether to perform the adjustment of the charging cut-off parameter is determined subsequently and continuously based on the first count value and the second count value.
The following describes an implementation process of the step S101 with reference to a specific embodiment.
Example (b): the power utilization parameter is taken as the remaining SOC of the battery system after discharging.
As shown in fig. 2, the method specifically includes:
s201, when an ith preset reset period is reached, finding out a minimum residual SOC from n residual SOCs acquired in the ith preset reset period, and adding a first count value to +1;
wherein i may be an integer greater than 0; and, n may be an integer greater than 1.
S202, judging whether the minimum residual SOC is smaller than the SOC safety lower limit; if yes, go to S203; if not, executing S204;
wherein, the SOC safety lower limit may be set to, but not limited to: the charging cutoff SOC corresponding to each preset reset period is 5% to 10%, which may be determined according to the estimation accuracy of the SOC, and is not limited herein.
S203, calculating a difference value between the SOC safety lower limit and the minimum residual SOC, and adjusting the charging cut-off SOC corresponding to the ith preset reset period based on the sum of the difference value and the SOC safety lower limit; and clearing the first count value; ending the flow;
s204, judging whether the minimum residual SOC is higher than a preset proportion of the SOC safety lower limit; if yes, go to S205; if not, executing S210;
the preset ratio may be set to 5% to 15%, and may be determined according to actual needs, which is not limited herein.
S205, adding the second counting value to be +1;
s206, judging whether the first count value and the second count value are both n; if yes, go to S207; if not, executing S208;
s207, adjusting a charging cut-off SOC corresponding to the ith preset reset period based on a difference value between the SOC safety lower limit and a preset proportion; clearing the first count value and the second count value; ending the flow;
s208, judging whether the first count value is n; if yes, go to S209; if not, executing S210;
s209, clearing the first count value and the second count value, and keeping the charge cut-off parameter corresponding to the current preset reset period unchanged; ending the flow;
and S210, keeping the first count value and the second count value unchanged, and keeping the charge cut-off parameter corresponding to the current preset reset period unchanged.
Next, a process of implementing the step S102 will be described.
In some embodiments, in step S102, if the charging cut-off parameter is adjusted in the current preset reset period, the adjusted charging cut-off parameter takes effect in the next preset reset period, so that in the next preset reset period, if the charging parameter after the charging of the battery system reaches the adjusted charging cut-off parameter, the charging may be considered to be completed, the charging is finished, the electric quantity redundancy is avoided, meanwhile, the power consumption requirement of the user may also be met, and the battery system may also be prevented from being in a higher SOC state after the charging is completed, so as to prolong the service life of the battery system.
It is noted that, through tests, when the battery system is charged by the above charging method, under the evaluation condition that the storage time ratio is not less than 60%, the SOH decay is reduced by 0.55% based on the comparison between the storage of the battery system at 50% SOC and the storage at 100% SOC within half a year, for the battery system having a design life of 10 years, the SOH decay can be reduced by 6.6%, and the service life of the battery system can be prolonged by about 3 years.
Therefore, it can be determined through the test data that the service life of the battery system can be effectively prolonged by charging the battery system by adopting the charging method.
Based on the same inventive concept, embodiments of the present invention provide a charging control device for a battery system, the implementation principle of the device is similar to that of the charging method, and specific embodiments of the device may refer to specific embodiments of the charging method, and repeated details are omitted.
Specifically, as shown in fig. 3, the charge control device for a battery system according to an embodiment of the present invention may include:
a memory 301 for storing program instructions;
the processor 302 is configured to call the program instructions stored in the memory 301, and execute the charging method according to the obtained program.
Based on the same inventive concept, an embodiment of the present invention provides an electrical device, as shown in fig. 4, including: a battery system 401, and the above-described charge control device 402 according to the embodiment of the present invention;
the charge control device 402 controls the charging process of the battery system 401.
In some embodiments, the charging control device may be implemented by a battery management system, or other devices with control functions in the electric device.
Also, in some embodiments, in determining the electricity usage parameter based on the manually entered data, the electricity consuming device may provide a display and/or operation buttons, wherein an operable display interface may be provided in the display, and may also display the charging process of the battery system, so as to facilitate the user to view and enter relevant content at any time.
In some embodiments, the electric device may be, but is not limited to, an energy storage station, an electric ship, an electric vehicle, or the like.
In some embodiments, the electric device may include, in addition to the battery system and the charging control device, other structures that may be used to implement the functions of the electric device, and is not limited herein.
Based on the same inventive concept, embodiments of the present invention provide a readable storage medium, where the readable storage medium stores executable instructions of a charging control device, and the executable instructions of the charging control device are used to enable the charging control device to execute the charging method provided in the embodiments of the present invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method of charging a battery system, comprising:
determining a charge cut-off parameter according to the electric quantity consumed by the battery system in the current preset reset period;
charging the battery system in the next preset reset period by adopting the determined charging ending parameter, and finishing charging when the charging parameter of the battery system reaches the determined charging ending parameter;
determining a charge cut-off parameter according to the consumed electric quantity of the battery system in a current preset reset period, wherein the charge cut-off parameter comprises the following steps:
when the preset reset period comprises n preset acquisition periods, n is an integer greater than 1, and each preset acquisition period corresponds to a power utilization parameter used for representing the power consumption of the battery system in the preset acquisition period, finding out an extreme value from the n power utilization parameters in the current preset reset period;
adjusting the charge cut-off parameter corresponding to the current preset reset period according to the found extreme value and the size of the preset parameter safety lower limit, and taking the adjusted charge cut-off parameter as the charge cut-off parameter of the next preset reset period;
adjusting the charge cut-off parameter corresponding to the current preset reset period according to the found extreme value and the preset parameter safety lower limit, including:
when the electricity utilization parameter is the residual SOC or the residual voltage of the battery system after discharging, the parameter safety lower limit is the SOC safety lower limit or the voltage safety lower limit, the charge cut-off parameter is the charge cut-off SOC or the charge cut-off voltage, and the extreme value is the minimum value:
if the minimum value is smaller than the parameter safety lower limit, calculating a difference value between the parameter safety lower limit and the minimum value, and adjusting a charge cut-off parameter corresponding to the current preset reset period based on the sum of the difference value and the parameter safety lower limit;
and if the minimum value is higher than the preset proportion of the parameter safety lower limit, adjusting the charging cut-off parameter corresponding to the current preset reset period based on the preset proportion.
2. The charging method according to claim 1, wherein adjusting the charge cut-off parameter corresponding to the current preset reset period according to the found extremum and a preset parameter safety lower limit comprises:
and when the electricity utilization parameter is the SOC or the voltage consumed by the battery system during discharging, the parameter safety lower limit is the SOC safety lower limit or the voltage safety lower limit, the charge cut-off parameter is the charge cut-off SOC or the charge cut-off voltage, and the extreme value is the maximum value, the charge cut-off parameter corresponding to the current preset reset period is adjusted based on the sum of the maximum value and the parameter safety lower limit.
3. The charging method according to claim 1, wherein adjusting the charge cut-off parameter corresponding to the current preset reset period based on the preset ratio comprises:
and when the charge cut-off parameter is the charge cut-off SOC, adjusting the charge cut-off parameter corresponding to the current preset reset period based on the difference value between the charge cut-off SOC corresponding to the current preset reset period and the preset proportion.
4. The charging method according to claim 1, further comprising:
when the current preset reset period is reached, adding one to the first count value;
when the charging cutoff parameter corresponding to the current preset reset period is adjusted, clearing the first count value;
when the minimum value is higher than the preset proportion of the parameter safety lower limit, adding one to a second counting value;
before adjusting the charge cut-off parameter corresponding to the current preset reset period based on the preset proportion, determining that the first count value and the second count value are both n;
and clearing the second count value when the charge cut-off parameter corresponding to the current preset reset period is adjusted based on the preset proportion.
5. The charging method according to claim 4, further comprising:
when the first count value is n and the second count value is not n, clearing the first count value and the second count value, and keeping the charge cut-off parameter corresponding to the current preset reset period unchanged;
and when the first count value is not n, keeping the first count value and the second count value unchanged, and keeping the charge cut-off parameter corresponding to the current preset reset period unchanged.
6. A charge control device of a battery system, characterized by comprising:
a memory for storing program instructions;
a processor for calling said program instructions stored in said memory to execute the charging method of any one of claims 1-5 in accordance with the obtained program.
7. An electrical device, comprising: a battery system, and a charge control device as claimed in claim 6.
8. A readable storage medium storing instructions executable by a charging control device for causing the charging control device to perform the charging method according to any one of claims 1 to 5.
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| CN113733981B (en) * | 2020-05-29 | 2023-04-28 | 蜂巢能源科技股份有限公司 | Charging control method and device of power battery, medium and electronic equipment |
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