CN112578302A - Echelon utilization power battery recombination method, system, equipment and storage medium - Google Patents
Echelon utilization power battery recombination method, system, equipment and storage medium Download PDFInfo
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- CN112578302A CN112578302A CN202011440103.1A CN202011440103A CN112578302A CN 112578302 A CN112578302 A CN 112578302A CN 202011440103 A CN202011440103 A CN 202011440103A CN 112578302 A CN112578302 A CN 112578302A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005215 recombination Methods 0.000 title claims abstract description 32
- 230000006798 recombination Effects 0.000 title claims abstract description 32
- 230000014759 maintenance of location Effects 0.000 claims abstract description 25
- 238000004590 computer program Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 230000008521 reorganization Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000003168 reconstitution method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
A power battery recombination method, a system, equipment and a storage medium are used in a gradient manner to detect the capacity retention rate, the internal resistance increase rate or the open-circuit voltage of a power battery; selecting a power battery with capacity retention rate, internal resistance increasing rate or open-circuit voltage meeting a set threshold as a gradient utilization power battery; and recombining the echelon utilization power batteries according to the use conditions and the recombination standard. The invention can meet the application requirements under different scenes and can utilize the retired power battery to the maximum extent, thereby improving the economy of the echelon utilization of the power battery. The method adopted by the invention is easy to realize in engineering implementation and has higher application value.
Description
Technical Field
The invention belongs to the technical field of electric automobiles and energy storage, and particularly relates to a method, a system, equipment and a storage medium for recombining a power battery by echelon utilization.
Background
In recent years, the electric automobile industry in China is rapidly developed, and the quantity of electric automobiles in China exceeds 410 thousands by 6 months in 2020. At present, lithium ion power batteries are mainly used as power sources of electric automobiles, the performance of the power batteries is continuously degraded in the use process of the automobiles, the performance difference between the batteries is larger and larger, and the batteries need to be decommissioned from the automobiles when the batteries cannot meet the use requirements of the electric automobiles. Along with the rapid development of automobiles in China, the retirement amount of power batteries is also rapidly increased, the retirement amount of the power batteries exceeds 20GWH in 2020, and approaches 100GWH in 2025. Many of the retired power batteries still have high residual energy, and the batteries can be applied to occasions with low performance requirements through screening and recombination again, so that the gradient utilization of the power batteries is realized.
Compared with a new battery, the performance difference between batteries is obviously increased and the consistency is obviously reduced when the power battery is out of service, so that the power battery is usually required to be recombined before the utilization of the echelon to ensure better performance consistency in the utilization process of the echelon. The traditional method still sets a certain parameter threshold value aiming at parameters such as capacity, open-circuit voltage, internal resistance and the like of the battery according to a new battery method, and combines the batteries within a certain deviation range; however, the parameter difference between the retired power batteries is obviously increased compared with that of new batteries, the adoption of the traditional new battery recombination standard can cause that most of the retired power batteries are eliminated, and the echelon utilization rate is too low; meanwhile, the echelon utilization of the retired power battery has a plurality of potential application scenes, the use working condition under each scene is greatly different, the requirements on the performance difference between the echelon utilization batteries are different,
disclosure of Invention
The invention aims to provide a method, a system, equipment and a storage medium for recombining a power battery by using echelon utilization.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a power battery recombination method for gradient utilization is used for detecting the capacity retention rate, the internal resistance increase rate and/or the open-circuit voltage of a power battery;
selecting a power battery with capacity retention rate, internal resistance increasing rate and/or open-circuit voltage meeting set threshold values as a gradient utilization power battery;
and recombining the echelon utilization power batteries according to the use conditions and the recombination standard.
A further improvement of the invention is that the capacity retention is calculated by the formula:
CR＝Q/Qr*100％ (1)
wherein CR is a capacity retention ratio, Q is a capacity after discharge, and Q isrIs rated capacity.
A further improvement of the invention is that the post-discharge capacity is obtained by: according to rated capacity QrAnd charging and discharging electricityAnd (3) voltage range, charging the echelon power battery to the upper limit voltage by constant current at the rate of 0.3-0.5C of rated capacity, standing for 120min, measuring open circuit internal resistance R, and then discharging the echelon power battery to the lower limit voltage by constant current at the rate of 0.3-0.5C to obtain the discharged capacity.
A further improvement of the present invention is that the internal resistance increase rate is calculated by the following formula:
RIR＝(R-R0)/R0*100％ (2)
wherein RIR is the increase rate of internal resistance, R is the open-circuit internal resistance0Is the initial resistance.
The invention is further improved in that the open-circuit internal resistance is obtained by the following process: and charging the battery to the upper limit voltage at a constant current of 0.3-0.5C multiplying power of the rated capacity, standing for 120min, and measuring the open-circuit internal resistance.
The invention is further improved in that the using conditions comprise the number of times of charge and discharge per year, the ambient temperature of the battery, the charge and discharge rate and the depth of each charge and discharge.
A further improvement of the invention is that the reconstitution standards include capacity retention, capacity range, OCV2Extremely poor, the increase rate of internal resistance and the internal resistance are extremely poor.
A power battery recombination system for gradient utilization comprises
The detection module is used for detecting the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage of the power battery;
the selection module is used for selecting the power battery with the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage meeting the set threshold value as the gradient utilization power battery;
and the recombination module is used for recombining the echelon utilization power battery according to the use condition and the recombination standard.
A computer device comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, the computer program when executed by the processor implementing the above-described echelon utilization power cell reorganization method.
A computer-readable storage medium, which stores a computer program that, when executed by a processor, causes the processor to perform the above-described echelon utilization power cell reorganization method.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, whether the echelon utilization value is obtained is judged according to the detection result of the echelon utilization power battery capacity retention ratio, the internal resistance increasing rate or the open-circuit voltage; for the battery without echelon utilization value, higher potential safety hazard exists, and echelon utilization is not carried out, so that the utilization rate of the retired power battery is improved on the basis of ensuring the safety and reliability of the echelon utilization battery; for the battery with the echelon utilization value, according to the use condition, the capacity retention rate, the capacity range difference, the open circuit voltage difference, the internal resistance increasing rate and the internal resistance range difference are taken as parameters to be recombined, and the residual value of the echelon utilization power battery is fully exerted. Therefore, the application requirements under different scenes can be met, and the retired power battery can be utilized to the maximum extent, so that the economy of the echelon utilization of the power battery is improved. The method adopted by the invention is easy to realize in engineering implementation and has higher application value.
Drawings
Fig. 1 is a flow chart of the power battery recombination by using the power batteries in a gradient manner.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention discloses a recombination method for a echelon utilization power battery, which adopts different recombination standards according to different application working conditions, improves the utilization rate of a retired power battery on the basis of ensuring the safety and reliability of the echelon utilization battery, and sets different recombination standards according to the use conditions of the echelon utilization battery in different scenes, so that the application requirements in different scenes can be met, the retired power battery can be utilized to the maximum extent, and the economy of echelon utilization of the power battery is improved. The method has wide application prospect in the fields of electric vehicles, electrochemical energy storage, echelon utilization of power batteries and the like.
The invention relates to a power battery recombination method by gradient utilization, which is mainly used for a lithium ion power battery which is retired in large scale in the future, and comprises the following steps of firstly detecting the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage of the power battery; selecting a power battery with capacity retention rate, internal resistance increasing rate and/or open-circuit voltage meeting set threshold values as a gradient utilization power battery; and recombining the echelon utilization power batteries according to the use conditions and the recombination standard.
Referring to fig. 1, the specific process is as follows:
(1) detecting open-circuit voltage before charging and discharging: before the battery is subjected to a charge-discharge capacity test, the open-circuit voltage OCV of the battery is tested and recorded1. And then judging whether the open-circuit voltage is in the range according to the charge-discharge voltage range on the specification of the model battery product, wherein the battery out of the range has higher potential safety hazard, and the battery recycling treatment is directly carried out without gradient utilization.
(2) Battery capacity, full-state open-circuit voltage and internal resistance detection: according to the rated capacity Q of the battery provided in the specification of the battery productrAnd charging and discharging voltage range, charging the battery to upper limit voltage at constant current of 0.3-0.5C rate of rated capacity at 25 + -5 deg.C, standing for 120min, and measuring open-circuit voltage OCV of the battery2And open circuit internal resistance R, then constant current discharging the battery to the lower limit voltage at the same multiplying power (0.3-0.5C multiplying power), and recording the current capacity Q of the battery. Calculating the capacity retention ratio CR and the internal resistance increase ratio RIR of the power battery used in the echelon, wherein the specific method comprises the following steps:
CR＝Q/Qr*100％ (1)
RIR＝(R-R0)/R0*100％ (2)
wherein R is0The internal resistance of the new battery, namely the initial resistance, is provided on the specification of the battery product of the model.
For the battery with the capacity retention rate CR lower than 50%, the residual capacity is too low, the echelon utilization value is small, and the battery is directly recycled without echelon utilization; for the battery with the internal resistance increasing rate RIR exceeding 200%, the safety risk in the use process is higher, and the battery is directly recycled without gradient utilization.
(3) Analysis of battery usage conditions during echelon utilization
Aiming at scenes and system configuration when the retired power battery is used in a gradient manner, the service conditions of the power battery used in the gradient manner are analyzed, and the service conditions mainly comprise the annual charging and discharging times, the ambient temperature of the battery, the charging and discharging multiplying power and the depth of each charging and discharging.
(4) Echelon utilization power battery recombination under different use conditions
Different recombination standards are adopted according to different using conditions during battery gradient utilization, and the specific recombination standards are shown in the following table 1:
TABLE 1 conditions of use and criteria for recombination
A power battery reorganization system for gradient utilization comprises:
the detection module is used for detecting the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage of the power battery;
the selection module is used for selecting the power battery with the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage meeting the set threshold value as the gradient utilization power battery;
and the recombination module is used for recombining the echelon utilization power battery according to the use condition and the recombination standard.
A computer device comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, the computer program when executed by the processor implementing the above-described echelon utilization power cell reorganization method.
A computer-readable storage medium, which stores a computer program that, when executed by a processor, causes the processor to perform the above-described echelon utilization power cell reorganization method.
According to the invention, the recombination method of the echelon utilization power battery under different use conditions is provided according to the detection results of the capacity, the open-circuit voltage and the internal resistance of the echelon utilization power battery and different use condition analysis, the echelon utilization of batteries with different performance differences is considered, the echelon utilization rate of the retired power battery is improved, and the technical economy of the echelon utilization of the power battery is improved. The method adopted by the invention is easy to realize in engineering implementation and has higher application value.
According to the invention, batteries without echelon utilization value and high potential safety hazard are eliminated by detecting the open-circuit voltage, the capacity and the internal resistance of the retired power battery, and different recombination methods are adopted by taking the capacity retention rate, the capacity range difference, the open-circuit voltage difference, the internal resistance increasing rate and the internal resistance range difference as parameters according to different use conditions during echelon utilization.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A power battery recombination method by echelon utilization is characterized in that,
detecting the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage of the power battery;
selecting a power battery with capacity retention rate, internal resistance increasing rate and/or open-circuit voltage meeting set threshold values as a gradient utilization power battery;
and recombining the echelon utilization power batteries according to the use conditions and the recombination standard.
2. The echelon utilization power battery recombination method according to claim 1, characterized in that the capacity retention rate is calculated by the following formula:
CR＝Q/Qr*100％ (1)
wherein CR is a capacity retention ratio, Q is a capacity after discharge, and Q isrIs rated capacity.
3. The echelon utilization power battery reorganization method according to claim 2, wherein the capacity after discharge is obtained by: according to the rated capacity and the charging and discharging voltage range, the power battery is charged to the upper limit voltage in a constant current mode by using the power battery in the echelon mode at the multiplying power of 0.3-0.5C of the rated capacity, the open circuit internal resistance is measured after standing, and then the power battery is discharged to the lower limit voltage in the constant current mode by using the echelon mode at the multiplying power of 0.3-0.5C, so that the capacity after discharging is obtained.
4. The echelon utilization power battery reconstitution method according to claim 1, wherein the internal resistance increase rate is calculated by the following formula:
RIR＝(R-R0)/R0*100％ (2)
wherein RIR is the increase rate of internal resistance, R is the open-circuit internal resistance0Is the initial resistance.
5. The echelon utilization power battery recombination method according to claim 4, characterized in that the open-circuit internal resistance is obtained by the following processes: and (3) charging the battery to the upper limit voltage at a constant current of 0.3-0.5C multiplying power of rated capacity, standing, and measuring the open-circuit internal resistance.
6. The method as claimed in claim 1, wherein the conditions include the number of charge and discharge cycles per year, the ambient temperature of the battery, the charge and discharge rate, and the depth of each charge and discharge cycle.
7. The method of claim 1, wherein the reconfiguration criteria include capacity retention, capacity range, OCV2Extremely poor internal resistanceThe increase rate and the internal resistance were very poor.
8. A power battery recombination system for gradient utilization is characterized by comprising
The detection module is used for detecting the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage of the power battery;
the selection module is used for selecting the power battery with the capacity retention rate, the internal resistance increasing rate and/or the open-circuit voltage meeting the set threshold value as the gradient utilization power battery;
and the recombination module is used for recombining the echelon utilization power battery according to the use condition and the recombination standard.
9. A computer device comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, the computer program when executed by the processor implementing the echelon power cell re-assembly method of any one of claims 1-7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, causes the processor to perform the echelon utilization power battery reorganization method of any one of claims 1-7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113759254A (en) * | 2021-09-27 | 2021-12-07 | 中国联合网络通信集团有限公司 | Battery recombination method, device, equipment and storage medium |
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Application publication date: 20210330 |