CN115954561A - Operation and maintenance management method and system of lithium battery system and electronic equipment - Google Patents
Operation and maintenance management method and system of lithium battery system and electronic equipment Download PDFInfo
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Abstract
The disclosure provides an operation and maintenance management method and system of a lithium battery system and an electronic device. The operation and maintenance management method can realize diagnosis, operation and maintenance and calibration operation and maintenance management through a series of operation steps, on the basis of efficiently maintaining the consistency of the battery, the diagnosis and the sorting of the states of the lithium ion energy storage battery system are quickly realized by combining the setting of dynamic thresholds of different levels, and the lithium ion energy storage battery system is maintained and replaced according to different diagnosis results, so that disassembly-free detection diagnosis is realized, the safe, reliable and long-life stable operation of the lithium ion energy storage battery system is ensured, the state parameters of the lithium ion energy storage battery system can be calibrated, and the efficient operation and maintenance of the lithium ion energy storage battery system is further realized.
Description
Technical Field
The disclosure relates to the technical field of batteries, in particular to an operation and maintenance management method and system for a lithium battery system and electronic equipment.
Background
The construction of a novel power system, the rapid development of new energy and intelligent energy promotes the large-scale construction and operation of a novel energy storage power station. With the improvement of the performance of the lithium ion battery, the reduction of the cost and the support of national and local policies, the energy storage system of the lithium ion battery is explosively increased and applied in a large scale. According to statistics, by the end of 2020, the accumulated installed power scale of the electrochemical energy storage market in China is 3269.2MW, the equivalent increase is 91.2%, the accumulated installed power scale of the newly added electrochemical energy storage reaches 1.56GW, and GW is broken through for the first time.
With the large-scale construction of the energy storage system, the energy storage system also enters a new stage of large-scale construction and operation and maintenance from the previous design and demonstration, the energy storage battery system is reasonably and normatively maintained in operation, the method is an important guarantee for ensuring the safe and reliable operation of the energy storage battery system and the stable operation of the energy storage battery system in a long life cycle, and is an effective means for truly realizing the management of the battery system in a whole life cycle. The operation and maintenance of the energy storage battery system at the present stage have various problems of unreasonable, incomplete, non-standard, long time consumption and the like, and the service life of the battery system and the safety and reliability of the energy storage system are greatly influenced.
The diagnosis, maintenance and calibration of the conventional energy storage battery system are performed separately and even finished by different companies, and the diagnosis, maintenance and calibration cannot be organically unified, so that the maintenance operation is complex, the error of a diagnosis result is large, effective and accurate calibration cannot be realized, and great adverse effects are caused on the safe and stable operation of the energy storage system.
Disclosure of Invention
In order to solve the technical problem, the present disclosure provides an operation and maintenance management method and system for a lithium battery system, and an electronic device, which can improve the safe, reliable and long-life stable operation of the lithium ion energy storage battery system, and realize the efficient operation and maintenance of the lithium ion energy storage battery system.
In one aspect, the present disclosure provides an operation and maintenance management method for a lithium battery system, including:
when a charging and discharging instruction is acquired, controlling the lithium battery system to discharge after charging, and discharging the fully-charged lithium battery system according to a set discharging working condition in the discharging process, wherein the discharging working condition is used for evaluating the attenuation state of the lithium battery;
acquiring battery data in the discharging process of a lithium battery system and open-circuit voltage values of all single batteries when the single batteries are in standing after discharging is completed;
calculating the capacity attenuation of each single battery according to the discharge working condition process and the open-circuit voltage value, and further calculating the relative internal resistance of each single battery;
evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels so as to diagnose and sort out the single batteries or battery modules needing to be replaced or stop diagnosing;
diagnosing that the battery or the module is required to be replaced, repeating the process until the state parameters of each single battery are in a safe interval,
wherein, the threshold value is used for confirming whether need carry out the change of battery cell or battery module, state parameter includes: the available capacity of the single battery, the capacity attenuation of the single battery, the relative internal resistance of the single battery in the current state and the open-circuit voltage value of the single battery.
Optionally, the process of controlling the lithium battery system to charge includes:
charging the lithium battery system by adopting a constant-current and constant-voltage charging mode; and
and performing consistency maintenance on all the single batteries by adopting an active balance or passive balance maintenance mode so as to ensure that all the single batteries of the lithium battery system are in a full-charge state.
Optionally, the discharge condition process includes:
discharging according to rated working condition current until the SOC of the lithium battery system is 80%, standing for 30min, discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuing to discharge according to the rated working condition current until the SOC of the lithium battery system is 60%, standing for 30min, then discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuing to discharge according to the rated working condition current until the SOC of the lithium battery system is 40%, standing for 30min, then discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuously discharging according to the rated working condition current until the SOC of the lithium battery system is 20%, standing for 30min, discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuing to discharge according to the rated working condition current until the SOC of the lithium battery system is 0%, standing for 30min, recording battery voltage and current data,
the SOC is the open-circuit voltage of the current battery, and the alpha value is one of the maximum current value of the lithium battery system when a circuit works and the maximum current value of the charging and discharging equipment connected with the lithium battery system when the charging and discharging equipment works.
Optionally, the capacity fading of each single battery is as follows:
SOH＝＝Q/(1-SOC)/C0 (1)
wherein, SOH is the capacity fade of the battery, C is the actual capacity of the current battery, C0 is the rated capacity, and Q is the actual released amp-hour capacity.
Optionally, in the evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels, the thresholds are executed in a hierarchical manner:
level I indicates no replacement is required;
the grade II indicates that the battery can be replaced or not, and whether the battery is replaced or not is related to the number of the battery monomers in the grade II, namely the number of the batteries in the grade II divided by the total number of the batteries is recorded as beta, and if the beta is less than or equal to 10%, the battery can be replaced;
and the III level represents a battery or a battery module which must be replaced.
Optionally, in the evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels, the dynamic adjustment of the thresholds is mainly based on the design life and the operating state of the battery system:
ΔSOH＝1-γ*(m/120)*30％ (2)
wherein Δ SOH represents a threshold for capacity fade of the battery, m is the number of months of operation, γ is generally taken from 0.8 to 1.2, and is used to determine level I, level II and level III thresholds, respectively, based on a selected value of γ.
Optionally, after the replacement is diagnosed, and the battery or the module to be replaced is replaced by a spare battery or a module, the operation and maintenance management method includes:
and adjusting the SOC value of the standby battery or the battery module to be equal to the average value of the SOC of the single batteries which do not need to be replaced in the battery system.
Optionally, the operation and maintenance management method further includes: and calibrating battery parameters of the lithium battery system and the single battery information:
calibrating available capacity, SOC, SOH, etc. of the lithium battery system, an
And calibrating the available capacity, SOC, SOH, relative internal resistance and other information of each single battery and/or battery module.
On the other hand, the present disclosure also provides an operation and maintenance management system for a lithium battery system, including:
the control unit responds to a charging instruction/a discharging instruction and controls the lithium battery system to charge/discharge according to a set discharging working condition;
the acquisition unit is used for acquiring battery data in the discharging process of the lithium battery system and open-circuit voltage values of the single batteries when the single batteries are in static state after discharging is completed;
the processing unit is used for calculating the capacity attenuation of each single battery and the relative internal resistance of each single battery according to the discharge working condition process and the open-circuit voltage value, evaluating the state parameters of each single battery according to the set dynamic threshold values of different levels so as to diagnose and sort out the single batteries or the battery modules needing to be replaced,
wherein, the threshold value is used for confirming whether need carry out the change of battery cell or battery module, state parameter includes: the available capacity of the single battery, the capacity attenuation of the single battery, the relative internal resistance of the single battery in the current state and the open-circuit voltage value of the single battery.
Optionally, the control unit comprises:
and the charging control module responds to the charging instruction, charges the lithium battery system in a constant-current and constant-voltage mode, and then performs consistency maintenance on all the single batteries in an active equalization or passive equalization maintenance mode so as to ensure the full charge state of all the single batteries of the lithium battery system.
In another aspect, the present disclosure also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of the method as described above.
In another aspect, the present disclosure also provides an electronic device, where the electronic device includes a memory, a processor, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor to perform the steps of the method as described above.
The invention has the beneficial effects that: the operation and maintenance management method for the lithium battery system comprises the following steps: when a charging and discharging instruction is acquired, controlling the lithium battery system to discharge after charging, and discharging the fully-charged lithium battery system according to a set discharging working condition in the discharging process, wherein the discharging working condition is used for evaluating the attenuation state of the lithium battery; acquiring battery data in the discharging process of a lithium battery system and open-circuit voltage values of all single batteries when the single batteries stand after discharging; calculating the capacity attenuation of each single battery according to the discharge working condition process and the open-circuit voltage value, and further calculating the relative internal resistance of each single battery; evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels so as to diagnose and sort out the single batteries or battery modules needing to be replaced or stop diagnosing; and after the battery or the module which needs to be replaced is diagnosed to be replaced, repeating the process until the state parameters of each single battery are in a safe interval, and stopping diagnosis. Therefore, diagnosis, operation and maintenance and calibrated operation and maintenance management can be realized through a series of operation steps, on the basis of efficiently maintaining the consistency of the battery, the diagnosis and sorting of the states of the lithium ion energy storage battery system can be quickly realized by combining setting of dynamic thresholds of different levels, the maintenance and replacement operation of the lithium ion energy storage battery system can be performed according to different diagnosis results, disassembly-free detection diagnosis is realized, the battery characteristic values such as the capacity and the relative internal resistance of the battery layer and the consistency thereof can be automatically obtained in the normal charging, discharging and standing processes of the whole life cycle of the battery energy storage, the safe, reliable and long-life stable operation of the lithium ion energy storage battery system is ensured, the state parameters of the lithium ion energy storage battery system can be calibrated, and the efficient operation and maintenance of the lithium ion energy storage battery system is further realized.
In addition, except for the regular correction of the working condition during the operation and maintenance period, the battery energy storage is not required to be specially detected to judge whether the battery has the hidden danger of reliability and safety, so that the lithium ion energy storage battery system can be in a normal operation state to the maximum extent.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of the embodiments of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart diagram illustrating an operation and maintenance management method for a lithium battery system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a process of setting a discharge condition in the operation and maintenance management method shown in FIG. 1;
FIG. 3 is a schematic diagram of a model to which the operation and maintenance management method shown in FIG. 1 is applied according to an embodiment of the present disclosure;
fig. 4 shows a block diagram of an operation and maintenance management system for a lithium battery system according to a second embodiment of the present disclosure;
fig. 5 shows a block diagram of an electronic device according to a fourth embodiment of the present disclosure.
Detailed Description
To facilitate an understanding of the present disclosure, the present disclosure will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present disclosure are set forth in the accompanying drawings. However, the present disclosure may be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
The system aims at the defects of the existing lithium ion energy storage battery system, such as the short service life and the low safety and reliability caused by the imperfect diagnosis, operation, maintenance and calibration work. The invention provides a diagnosis, operation and maintenance and calibration method of a high-efficiency lithium ion energy storage battery system, which aims to improve the safe, reliable and long-life stable operation of the lithium ion energy storage battery system and is a core guarantee for really realizing the full life cycle safety management of the lithium ion energy storage battery system.
According to the invention, the organic integration of diagnosis, operation and maintenance and calibration can be realized through a series of rapid and efficient operation methods, the diagnosis of the state of the lithium ion energy storage battery system can be rapidly realized, the maintenance and replacement operation can be carried out on the lithium ion energy storage battery system according to different diagnosis results, and further the state parameters of the lithium ion energy storage battery system can be calibrated, and the efficient operation and maintenance of the lithium ion energy storage battery system can be realized.
The present disclosure is described in detail below with reference to the accompanying drawings.
The first embodiment is as follows:
fig. 1 shows a schematic flow diagram of an operation and maintenance management method for a lithium battery system according to a first embodiment of the present disclosure, and fig. 2 shows a schematic process diagram of a discharge condition set in the operation and maintenance management method shown in fig. 1.
Referring to fig. 1, a first embodiment of the present disclosure provides an operation and maintenance management method for a lithium battery system, including:
s110: and when the charging and discharging instruction is acquired, controlling the lithium battery system to discharge after charging.
In step S110, the process of controlling the lithium battery system to charge includes: charging the lithium battery system by adopting a constant-current and constant-voltage charging mode; and
and performing consistency maintenance on all the single batteries by adopting an active equalization or equalization maintenance mode so as to ensure that all the single batteries of the lithium battery system are in a full-charge state.
And discharging the fully-filled lithium battery system according to a set discharging working condition in the discharging process, wherein the discharging working condition is used for evaluating the attenuation state of the lithium battery.
Referring to fig. 2, the discharge condition process includes:
discharging according to rated working condition current until the SOC of the lithium battery system is 80%, standing for 30min, discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuing to discharge according to the rated working condition current until the SOC of the lithium battery system is 60%, standing for 30min, then discharging for 30s at the multiplying power of alpha C, and standing for 30min;
by analogy, in the whole discharging process, multiplying power pulse discharging of the alpha C is added to SOC nodes of 80%,60%,40% and 20% respectively for 30s, and battery voltage and current data are recorded,
wherein SOC is a state of charge of the current battery, and its value corresponds to an open circuit voltage value, and the value α is taken from one of a maximum current value supported by the battery and an electrical circuit in the lithium battery system (when the circuit is operated) and a maximum current value supported by a charging and discharging device connected to the lithium battery system (when the device is operated), and in a preferred embodiment, the value α is taken from a smaller value of the two maximum current values.
S120: and acquiring battery data in the discharging process of the lithium battery system and open-circuit voltage values of the single batteries when the single batteries stand after discharging.
In step S120, the lithium battery system is left for not less than 1 hour after discharging, so as to obtain the open circuit voltage OCV of the single battery, and the battery data may include: the corresponding relation of the battery capacity SOC and the open-circuit voltage OCV of the single battery, the increment capacity curve of the lithium battery system and the increment capacity curve of the single battery, wherein the increment capacity curve comprises curves and the like of the relation between the capacity relative to the voltage change degree, the SOC and the OCV.
S130: and calculating the capacity attenuation of each single battery according to the discharge working condition process and the open-circuit voltage value, and further calculating the relative internal resistance of each single battery.
In step S130, the capacity fade of each unit cell is:
SOH＝＝Q/(1-SOC)/C0 (1)
wherein, SOH is the capacity fade of the battery, C is the actual capacity of the current battery, C0 is the rated capacity, and Q is the actual released ampere-hour capacity.
S140: and evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels so as to diagnose and sort out the single batteries or the battery modules needing to be replaced.
In step S140, the threshold is used to determine whether to replace the single battery or the battery module, and the state parameters include: available capacity of the unit cell, capacity fade SOH of the unit cell, relative internal resistance of the unit cell in a current state, and open circuit voltage OCV of the unit cell. In the evaluation of the state parameters of each single battery according to the set dynamic thresholds of different levels, the thresholds are executed in a hierarchical manner:
level I indicates no replacement is required;
the grade II indicates that the battery can be replaced or not, and whether the battery is replaced or not is related to the number of the battery monomers in the grade II, namely the number of the batteries in the grade II divided by the total number of the batteries is recorded as beta, and if the beta is less than or equal to 10%, the battery can be replaced;
level III indicates a battery or battery module that must be replaced.
Further, in this embodiment, in the evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels, the dynamic adjustment of the thresholds depends on the design life and the operating state of the battery system at the main time, taking SOH as an example, assuming that the design life of the battery system is 10 years and the design decay rate is 30%, the thresholds of SOH are:
ΔSOH＝1-γ*(m/120)*30％ (2)
where Δ SOH represents a threshold for capacity fade of the battery, m is the number of months of operation, γ is typically taken from 0.8 to 1.2, e.g., γ is taken from 0.95 and 1.05, and selected values of γ are used to determine class I, class II and class III thresholds, respectively. The relative internal resistances are similar, and therefore are not described herein.
S150: and (3) diagnosing that the battery or the module is required to be replaced, and repeating the process after replacing the battery or the module with the standby battery or the module until the state parameters of each single battery are in a safety interval.
In step S150, after it is diagnosed that the battery or module needs to be replaced and the spare battery or module is used to replace the battery or module that needs to be replaced, the operation and maintenance management method includes:
and adjusting the SOC value of the standby battery or the battery module to be equal to the average value of the SOC of the single batteries which do not need to be replaced in the battery system.
After the replacement is completed, operation and maintenance diagnosis is started for the lithium battery system according to the step S110, and battery parameter calibration is performed for the lithium battery system and the single battery information after the diagnosis is stopped:
when the battery system is emptied, recording the discharging ampere-hour capacity of the lithium battery system, and calibrating the discharging ampere-hour capacity as the available capacity of the battery system; the ratio of the available capacity of the lithium battery system to the initial capacity/rated capacity of the lithium battery system is calibrated as the SOH of the battery system; the calibration SOC of the battery system in the emptying state is 0%, and the voltage of the single battery after standing is the open-circuit voltage OCV; and generally in the last stage of battery discharge, the battery voltage discrimination is large, and at the moment, the SOC state of the single battery is calibrated according to the OCV; the available capacity/(1-SOC) of the lithium battery system is used for calibrating the available capacity of the single battery; the ratio of the available capacity of the single battery to the initial capacity/rated capacity of the single battery is calibrated as the SOH of the single battery; according to the relative internal resistance of the pulse discharge state in the discharge working condition, the relative internal resistance of the single battery in the current state is calibrated, and the recorded data is stored to be used as the historical data of subsequent monitoring and diagnosis so as to be called quickly and improve the operation and maintenance efficiency of the system.
Therefore, the organic integration of diagnosis, operation and maintenance and calibration is realized, the diagnosis and the sorting of the states of the lithium ion energy storage battery system are quickly realized by combining the setting of dynamic thresholds of different levels on the basis of efficiently maintaining the consistency of the battery, the maintenance and the replacement operation of the lithium ion energy storage battery system are carried out according to different diagnosis results, the disassembly-free detection diagnosis is realized, the battery characteristic values such as the capacity and the relative internal resistance of the battery layer and the consistency thereof can be automatically obtained in the normal charging, discharging and standing processes of the battery energy storage full life cycle, the safe, reliable and long-life stable operation of the lithium ion energy storage battery system is ensured, the state parameters of the lithium ion energy storage battery system can be calibrated, and the efficient operation and maintenance of the lithium ion energy storage battery system is further realized.
Fig. 3 is a schematic diagram of a model to which the operation and maintenance management method shown in fig. 1 is applied according to an embodiment of the present disclosure.
More specifically, the operation and maintenance management method provided by the embodiment of the present disclosure is further described with reference to fig. 1 to fig. 3. A series of operation steps integrating diagnosis, operation and maintenance and calibration are the basis of accurate diagnosis and operation and maintenance of a battery system, and the specific operation method comprises the following steps:
a. the lithium battery system is integrally charged, the lithium battery system is fully charged by adopting a constant-current and constant-voltage charging mode, the constant current adopts rated working condition current or charging current not less than 0.3C, and the constant-voltage charging stage is charged to 1/10 of the current in the constant-current stage;
b. charging all battery monomers by adopting an active equalization or passive equalization maintenance mode, fully charging the monomer batteries which are not fully charged in the stage a, efficiently and accurately realizing efficient consistency maintenance of the batteries, ensuring that all the monomers of the whole lithium battery system are in a full state, and calibrating the SOC state of the lithium battery system and each monomer battery to be 100%;
c. discharging the fully-filled lithium battery system according to a set discharging working condition until the whole lithium battery system cannot discharge; the discharge condition is used for preliminarily evaluating the attenuation state of the battery, and mainly comprises the attenuation of the capacity and the change of the relative internal resistance. To accurately evaluate its state, the discharge regime is designed to be: the lithium battery system which is fully charged and subjected to battery consistency maintenance is characterized in that firstly, according to rated working condition current in actual operation, the discharge is carried out until the SOC of the lithium battery system is 80%, after the static operation is carried out for 30min, the discharge is carried out for 30s at the multiplying power of alpha C according to the rated working condition current in actual operation, after the static operation is carried out for 30min, in the whole discharge process, the multiplying power pulse discharge of alpha C is respectively added to 80%,60%,40% and 20% SOC points for 30s, and the voltage and current data of the battery are recorded, wherein the data sampling time is not more than 0.1s. Wherein the alpha value is taken from the smaller value of the maximum current value supported by the battery and the electric loop in the lithium battery system and the maximum current value supported by the charging and discharging equipment connected with the battery system.
d. The battery system is stood for not less than 1 hour to obtain the open-circuit voltage OCV of the single battery;
e. accurately calculating the SOC of the single battery according to the discharge working condition process and the open-circuit voltage OCV after standing, further calculating the available capacity of the single battery, and evaluating the relative internal resistance of the single battery;
f. and evaluating the OCV, capacity, SOC, SOH and relative internal resistance of the single batteries according to the set dynamic threshold values of different levels, and quickly sorting out the single batteries or battery modules needing to be replaced.
The different levels of dynamic threshold have several characteristics:
1. the threshold is used for determining whether the battery or the battery module needs to be replaced, and through the efficient operation method, the threshold parameter mainly depends on the SOH and the relative internal resistance, wherein the SOH is the capacity attenuation of the battery and is represented as C/C0, wherein C is the capacity of the current battery, C0 is the capacity of a new battery, C = Q/(1-SOC), Q is the actually released ampere-hour capacity, and SOC is the state of charge of the current battery, and the value of the SOC is the corresponding value of the OCV; in addition, relative internal resistance R/R0 comes from pulse discharge under the discharge working condition 1, wherein R is the measured internal resistance of the current battery, and R0 is the measured internal resistance obtained when the new battery is subjected to pulse discharge under the discharge working condition 1;
2. the threshold value of the battery replacement is executed in a grading mode, and the I grade represents that the replacement is not needed; the level II indicates that the battery can be replaced or not, and whether the replacement is related to the number of the battery cells in the level II is specific, namely the number of the battery cells in the level II is divided by the total number of the battery cells and is recorded as beta, and if the beta is less than or equal to 10%, the battery cells can be replaced; and the III level represents a battery or a battery module which must be replaced.
3. Since the battery is used and decays, the threshold value needs to be dynamically adjusted according to the design life and the operation state of the battery system. Taking SOH as an example, assuming that the design life of the battery system is 10 years and the design decay rate is 30%, the threshold for SOH is equal to 1- γ (m/120) × 30%, where m is the number of operating months and γ is generally taken from 0.8 to 1.2, such as γ is taken from 0.95 and 1.05, and is used to determine class I, class II and class iii thresholds, respectively, with similar relative internal resistances.
g. Adjusting the SOC value of the standby battery or the battery module to be equal to the average SOC value of the single batteries which do not need to be replaced in the battery system;
h. replacing the battery or module to be replaced with a spare battery or module;
i. and after the replacement is finished, returning the lithium battery system to the previous step, charging according to the step a, and fully charging.
j. Discharging the battery system according to the rated working condition current during actual operation until the whole battery system cannot discharge;
k. the battery system is stood for not less than 1 hour, the discharge ampere-hour capacity is recorded, and the open-circuit voltage OCV of the single battery is obtained;
and l, calibrating battery parameters of the battery system and the information of the single batteries, calibrating available capacity, SOC, SOH and the like of the battery system, and calibrating the available capacity, SOC, SOH, relative internal resistance and the like of the single batteries and/or the battery module.
The operation and maintenance management method provided by the embodiment realizes diagnosis, operation and maintenance and calibrated operation and maintenance management through a series of operation steps, quickly realizes diagnosis and sorting of states of the lithium ion energy storage battery system by combining setting of dynamic thresholds of different levels on the basis of high-efficiency maintenance of battery consistency, carries out maintenance and replacement operation on the lithium ion energy storage battery system according to different diagnosis results, realizes disassembly-free detection diagnosis, can automatically acquire battery characteristic values such as capacity, relative internal resistance and the like of a battery layer and consistency thereof in normal charging, discharging and standing processes of the battery energy storage full life cycle, ensures safe, reliable and long-life stable operation of the lithium ion energy storage battery system, and realizes high-efficiency operation and maintenance of the lithium ion energy storage battery system.
In addition, except for the regular correction of the working condition during the operation and maintenance period, the battery energy storage is not required to be specially detected to judge whether the battery has the hidden danger of reliability and safety, so that the lithium ion energy storage battery system can be in a normal operation state to the maximum extent.
Example two:
referring to fig. 4, a second embodiment of the present disclosure provides an operation and maintenance management system for a lithium battery system, configured to execute the operation and maintenance management method for the lithium battery system according to the first embodiment.
The operation and maintenance management system 100 for the lithium battery system according to the embodiment includes:
a control unit 110, which responds to a charging instruction/a discharging instruction, and controls the lithium battery system to charge/discharge according to a set discharging condition;
an obtaining unit 120, configured to obtain battery data during a discharging process of the lithium battery system and an open-circuit voltage value when each single battery stands after the discharging is completed;
a processing unit 130, configured to calculate the capacity attenuation of each single battery and the relative internal resistance of each single battery according to the discharge working condition process and the open-circuit voltage value, and evaluate the state parameters of each single battery according to set dynamic thresholds of different levels, so as to diagnose and sort out the single batteries or battery modules that need to be replaced,
wherein, the threshold value is used for determining whether to replace the single battery or the battery module, and the state parameters comprise: the available capacity of the single battery, the capacity attenuation of the single battery, the relative internal resistance of the single battery in the current state and the open-circuit voltage value of the single battery.
Further, in this embodiment, the control unit 110 includes:
the charging control module 111 is used for responding to the charging instruction, charging the lithium battery system in a constant-current and constant-voltage mode, and then performing consistency maintenance on all the single batteries in an active equalization or passive equalization maintenance mode to ensure the full charge state of all the single batteries in the lithium battery system; and
the discharge control module 112 is configured to execute the discharge condition process set in fig. 2 in the first embodiment.
Example three:
a third embodiment of the present disclosure provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the operation and maintenance management method for a lithium battery system described in the first embodiment are executed. For specific implementation, reference may be made to the first method embodiment, which is not described herein again.
Example four:
referring to a schematic structural diagram of an electronic device shown in fig. 5, an embodiment of the present disclosure further provides an electronic device 200, where the electronic device 200 includes a bus 201, a processor 210, a transceiver 230, a bus interface 240, a memory 220, and a user interface 241.
In this embodiment, the electronic device 200 further includes: one or more programs stored on the memory 220 and executable on the processor 210, configured for execution by the processor to perform the steps of:
when a charging and discharging instruction is acquired, controlling the lithium battery system to discharge after charging;
acquiring battery data in the discharging process of a lithium battery system and open-circuit voltage values of all single batteries when the single batteries are in standing after discharging is completed;
calculating the capacity attenuation of each single battery according to the discharge working condition process and the open-circuit voltage value, and further calculating the relative internal resistance of each single battery;
evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels so as to diagnose and sort out the single batteries or the battery modules needing to be replaced;
and after replacing the battery or the module needing to be replaced by the standby battery or the module, repeating the process until the state parameters of the single batteries are in a safety interval, and stopping diagnosis.
In the present embodiment, the transceiving device 230 is used to receive and transmit data under the control of the processor 210.
Where a bus architecture (represented by bus 201) is used, bus 201 may include any number of interconnected buses and bridges, and bus 201 links together various circuits including one or more processors, represented by processor 210, and memory, represented by memory 220. The bus 201 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further in this embodiment. A bus interface 240 provides an interface between the bus 201 and the transceiver device 230. Transceiver device 230 may be one element or multiple elements, such as multiple receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. For example: the transceiving device 230 receives external data from other devices. The transceiver device 230 is used to transmit the data processed by the processor 210 to other devices. Depending on the nature of the computing system, a user interface 241, such as a keypad, display, speaker, microphone, joystick, may also be provided.
The processor 210 is responsible for managing the bus 201 and the usual processing, running a general-purpose operating system as described above. And memory 220 may be used to store data used by processor 210 in performing operations.
Alternatively, the processor 210 may be, but is not limited to: a central processing unit, a singlechip, a microprocessor or a programmable logic device.
It will be appreciated that memory 220 in embodiments of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), double Data Rate Synchronous Dynamic random access memory (ddr Data Rate SDRAM, ddr SDRAM), enhanced Synchronous SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 220 of the systems and methods described in this embodiment is intended to comprise, without being limited to, these and any other suitable types of memory.
In some embodiments, memory 220 stores elements, executable modules or data structures, or a subset thereof, or an expanded set thereof as follows: an operating system 221 and application programs 222.
The operating system 221 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application 222 includes various applications, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. A program implementing a method according to an embodiment of the invention may be included in the application 222.
It should be noted that in the description of the present disclosure, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate orientation or positional relationship, are only for convenience in describing the present disclosure and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present disclosure.
In addition, in this document, the terms "include", "include" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present disclosure, and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention as herein taught are within the scope of the present disclosure.
Claims (12)
1. An operation and maintenance management method for a lithium battery system comprises the following steps:
when a charging and discharging instruction is acquired, controlling the lithium battery system to discharge after charging, and discharging the fully-charged lithium battery system according to a set discharging working condition in the discharging process, wherein the discharging working condition is used for evaluating the attenuation state of the lithium battery;
acquiring battery data in the discharging process of a lithium battery system and open-circuit voltage values of all single batteries when the single batteries are in standing after discharging is completed;
calculating the capacity attenuation of each single battery according to the discharge working condition process and the open-circuit voltage value, and further calculating the relative internal resistance of each single battery;
evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels so as to diagnose and sort out the single batteries or the battery modules which need to be replaced or stop diagnosing;
diagnosing that the battery or the module is required to be replaced, repeating the process until the state parameters of each single battery are in a safe interval,
wherein, the threshold value is used for determining whether to replace the single battery or the battery module, and the state parameters comprise: the available capacity of the single battery, the capacity attenuation of the single battery, the relative internal resistance of the single battery in the current state and the open-circuit voltage value of the single battery.
2. The operation and maintenance management method according to claim 1, wherein the process of controlling the lithium battery system to charge comprises:
charging the lithium battery system by adopting a constant-current and constant-voltage charging mode; and
and performing consistency maintenance on all the single batteries by adopting an active balance or passive balance maintenance mode so as to ensure that all the single batteries of the lithium battery system are in a full-charge state.
3. The operation and maintenance management method according to claim 2, wherein the discharge condition process comprises:
discharging according to rated working condition current until the SOC of the lithium battery system is 80%, standing for 30min, discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuing to discharge according to the rated working condition current until the SOC of the lithium battery system is 60%, standing for 30min, then discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuously discharging according to the rated working condition current until the SOC of the lithium battery system is 40%, standing for 30min, discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuously discharging according to the rated working condition current until the SOC of the lithium battery system is 20%, standing for 30min, discharging for 30s at the multiplying power of alpha C, and standing for 30min;
continuing to discharge according to the rated working condition current until the SOC of the lithium battery system is 0%, standing for 30min, recording battery voltage and current data,
the SOC is the open-circuit voltage of the current battery, and the value alpha is taken from one of the maximum current value of the lithium battery system when a circuit works and the maximum current value of the charging and discharging equipment connected with the lithium battery system when the charging and discharging equipment works.
4. The operation and maintenance management method according to claim 3, wherein the capacity fading of each single battery is as follows:
SOH＝＝Q/(1-SOC)/C0(1)
wherein, SOH is the capacity fade of the battery, C is the actual capacity of the current battery, C0 is the rated capacity, and Q is the actual released ampere-hour capacity.
5. The operation and maintenance management method according to claim 4, wherein, in the evaluation of the state parameters of the single batteries according to the set dynamic thresholds of different levels, the thresholds are executed in a hierarchical manner:
level I indicates no replacement is required;
the level II indicates that the battery can be replaced or not, and whether the replacement is related to the number of the battery cells in the level II is specific, namely the number of the battery cells in the level II is divided by the total number of the battery cells and is recorded as beta, and if the beta is less than or equal to 10%, the battery cells can be replaced;
and the III level represents a battery or a battery module which must be replaced.
6. The operation and maintenance management method according to claim 5, wherein in the evaluation of the state parameters of each battery cell according to the set dynamic thresholds of different levels, the dynamic adjustment of the thresholds depends on the design life and the operation state of the battery system at the main time:
ΔSOH＝1-γ*(m/120)*30％(2)
wherein Δ SOH represents a threshold for capacity fade of the battery, m is the number of months of operation, γ is generally taken from 0.8 to 1.2, and is used to determine level I, level II and level III thresholds, respectively, based on a selected value of γ.
7. The operation and maintenance management method according to claim 6, wherein after the diagnosis that the battery or the module needs to be replaced is replaced by the spare battery or the module, the operation and maintenance management method comprises the following steps:
and adjusting the SOC value of the standby battery or the battery module to be equal to the average value of the SOC of the single batteries which do not need to be replaced in the battery system.
8. The operation and maintenance management method according to claim 6, further comprising: and calibrating battery parameters of the lithium battery system and the single battery information:
calibrating available capacity, SOC, SOH, etc. of the lithium battery system, and
and calibrating the available capacity, SOC, SOH, relative internal resistance and other information of each single battery and/or battery module.
9. An operation and maintenance management system for a lithium battery system, comprising:
the control unit responds to a charging instruction/a discharging instruction and controls the lithium battery system to charge/discharge according to a set discharging working condition;
the acquisition unit is used for acquiring battery data in the discharging process of the lithium battery system and open-circuit voltage values of the single batteries when the single batteries stand after discharging;
the processing unit is used for calculating the capacity attenuation of each single battery and the relative internal resistance of each single battery according to the discharge working condition process and the open-circuit voltage value, evaluating the state parameters of each single battery according to the set dynamic thresholds of different levels so as to diagnose and sort out the single batteries or the battery modules which need to be replaced,
wherein, the threshold value is used for confirming whether need carry out the change of battery cell or battery module, state parameter includes: the available capacity of the single battery, the capacity attenuation of the single battery, the relative internal resistance of the single battery in the current state and the open-circuit voltage value of the single battery.
10. The operation and maintenance management system of claim 9, the control unit comprising:
and the charging control module responds to the charging instruction, charges the lithium battery system in a constant-current and constant-voltage mode, and then performs consistency maintenance on all the single batteries in an active equalization or passive equalization maintenance mode so as to ensure the full charge state of all the single batteries of the lithium battery system.
11. A computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when being executed by a processor, is adapted to carry out the steps of the method of any of the preceding claims 1-8.
12. An electronic device, wherein the electronic device comprises a memory, a processor, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor to perform the steps of the method of any of claims 1-8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116430248A (en) * | 2023-04-19 | 2023-07-14 | 东莞市嘉佰达电子科技有限公司 | BMS operation and maintenance management system based on Internet |
| CN117394409A (en) * | 2023-10-16 | 2024-01-12 | 南方电网调峰调频(广东)储能科技有限公司 | Intelligent assessment method and system for equipment state of energy storage power station |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116430248A (en) * | 2023-04-19 | 2023-07-14 | 东莞市嘉佰达电子科技有限公司 | BMS operation and maintenance management system based on Internet |
| CN117394409A (en) * | 2023-10-16 | 2024-01-12 | 南方电网调峰调频(广东)储能科技有限公司 | Intelligent assessment method and system for equipment state of energy storage power station |
| CN117394409B (en) * | 2023-10-16 | 2024-03-19 | 南方电网调峰调频(广东)储能科技有限公司 | Intelligent assessment method and system for equipment state of energy storage power station |
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