CN117577977B - Whole-pack recycling control method for retired battery pack - Google Patents
Whole-pack recycling control method for retired battery pack Download PDFInfo
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- CN117577977B CN117577977B CN202410063866.0A CN202410063866A CN117577977B CN 117577977 B CN117577977 B CN 117577977B CN 202410063866 A CN202410063866 A CN 202410063866A CN 117577977 B CN117577977 B CN 117577977B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004064 recycling Methods 0.000 title claims abstract description 13
- 238000005070 sampling Methods 0.000 claims description 15
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- 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
- H01M10/4285—Testing apparatus
-
- 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
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a whole-pack recycling control method of retired battery packs, which comprises the following steps: acquiring parameter information of the retired battery pack, wherein the parameter information comprises capacity of the retired battery pack, internal resistance of the battery pack and voltage of the battery pack; determining a consistency index of the retired battery pack based on the parameter information of the retired battery pack; determining application requirements, including voltage requirements and current requirements, of the retired battery pack when reapplied; the method comprises the steps of dividing retired battery packs into two groups according to the consistency index being larger than a set value and smaller than the set value, connecting the retired battery packs which are smaller than the set value and meet the application voltage requirement in series, connecting the retired battery packs which are larger than the set value and meet the current requirement and the voltage requirement simultaneously in parallel, determining a reasonable and accurate index, and then integrating and recycling the battery packs, so that the recycling rate of the retired battery packs is improved, and meanwhile, the stability of a system in a new application scene can be ensured.
Description
Technical Field
The invention relates to a control method of a battery pack, in particular to a whole pack recycling control method of a retired battery pack.
Background
With the development of energy technology and the wide use of new energy, battery packs applied to new energy devices, such as power battery packs on new energy automobiles, are more and more increased, and when the battery packs are used to a certain extent (generally, the capacity of the battery packs is attenuated to a certain extent and cannot meet the corresponding device requirements), the battery packs need to be updated, and the updated battery packs are retired battery packs.
Although these retired battery packs cannot meet the use requirement in the initial application scenario, these retired battery packs can be reused after corresponding treatment, so that the service lives of these retired battery packs can be prolonged, environmental pollution caused by the retired battery pack treatment can be relieved to a certain extent, and based on the above, when a single battery pack is used in other scenarios with lower requirements, the use requirement may not be met, and therefore, a plurality of retired battery packs need to be used in a corresponding serial-parallel combination, but even if the battery packs of the same manufacturer and the same specification are different in the initial use environments, the attenuation states of the retired battery packs are inconsistent, and if the retired battery packs are directly used in new scenarios, the system in the new application scenario tends to be unstable.
Therefore, how to perform corresponding identification processing on the retired battery pack and accurately apply the retired battery pack to a new scenario becomes a technical problem to be solved urgently.
Disclosure of Invention
Therefore, the present invention is directed to a method for controlling the whole-package recycling of the retired battery pack, which determines a reasonable and accurate index based on the corresponding parameters of the retired battery pack, and then integrates and recycles the battery packs, so as to improve the recycling rate of the retired battery pack and ensure the stability of the system in a new application scenario.
The invention provides a whole-pack recycling control method of retired battery packs, which comprises the following steps:
Acquiring parameter information of the retired battery pack, wherein the parameter information comprises capacity of the retired battery pack, internal resistance of the battery pack and voltage of the battery pack;
determining a consistency index of the retired battery pack based on the parameter information of the retired battery pack;
Determining application requirements, including voltage requirements and current requirements, of the retired battery pack when reapplied;
The retired battery packs are divided into two groups according to the consistency index being larger than a set value and smaller than the set value, the retired battery packs with the consistency index being smaller than the set value and meeting the application voltage requirement are connected in series, and the retired battery packs with the consistency index being larger than the set value and meeting the current requirement and the voltage requirement are connected in parallel.
Further, the consistency index is determined by:
Wherein: For consistency index of retired battery packs,/> For capacity index of retired battery pack,/>Is the capacity index weight,/>For the internal resistance index of retired battery pack,/>Is index weight of internal resistance,/>Is the self-discharge rate index of the retired battery pack,/>Is the index weight of self-discharge rate, and/>。
Further, the capacity index of the retired battery pack is determined by：
Wherein: T is the actual ambient temperature, C is the measured maximum available capacity,/>, for the temperature coefficient The subscript i indicates the i-th retired battery pack for the rated capacity of the battery pack.
Further, the internal resistance index is determined by the following method：
Wherein: is the internal resistance temperature coefficient, T is the ambient temperature,/> Represents the direct current internal resistance measured at 25 ℃ of the ith battery pack,/>For the direct current internal resistance average value of retired battery pack,/>For the actual service time of the ith battery pack,/>Is the time coefficient of the (1, 2) interval.
Further, the self-discharge rate indexIs determined by the following method:
Wherein: for sampling the voltage value of the retired battery pack at the starting moment,/> For the voltage value of retired battery pack at the sampling termination time,/>For the time interval between the start and end of the sample,/>For self-discharge temperature coefficient of retired battery pack,/>For the ambient temperature at the start of the sample,/>For the ambient temperature at the moment of the end of the sample,/>Is the humidity coefficient,/>The change value of the ambient humidity from the sampling start time to the sampling end time is obtained.
The invention has the beneficial effects that: according to the invention, based on parameter information of the retired battery pack, including capacity of the retired battery pack, internal resistance of the battery pack and voltage of the battery pack, a consistency index can be accurately determined through the parameters, and the retired battery pack is accurately distributed to a new application scene based on the consistency index and requirements in the application scene, so that the reasonability of reutilization of the retired battery pack is effectively improved, the residual value of the retired battery pack can be exerted to the greatest extent, and the stability of a system in the retired battery pack reutilization scene can be effectively ensured.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The present invention is further described in detail below:
The invention provides a whole-pack recycling control method of retired battery packs, which comprises the following steps:
Acquiring parameter information of the retired battery pack, wherein the parameter information comprises capacity of the retired battery pack, internal resistance of the battery pack and voltage of the battery pack; of course, before this step, screening and distinguishing of retired battery packs is also needed, that is, battery packs with different specifications are grouped, where the specifications refer to that battery packs with the same rated capacity and rated output voltage are grouped, and two groups of battery packs are grouped under the same specification condition when the consistency comparison is performed;
determining a consistency index of the retired battery pack based on the parameter information of the retired battery pack;
Determining application requirements, including voltage requirements and current requirements, of the retired battery pack when reapplied;
The retired battery packs are divided into two groups according to the consistency index being larger than the set value and smaller than the set value (if the consistency index is just equal to the set value, the retired battery packs are divided into one group smaller than the set value), the retired battery packs with the consistency index being smaller than the set value and meeting the application voltage requirement are connected in series, the retired battery packs with the consistency index being larger than the set value and meeting the current requirement and the voltage requirement are connected in parallel, the voltage requirement is that the voltage of the battery packs after being connected in series meets the application requirement, the battery packs are applied to a target scene after being connected in series, although the voltage of the battery packs after being filled is different, the total voltage of the battery packs after being connected in series still can meet the requirement, the poor consistency can be applied to the target scene, and because the current of each battery pack after being connected in series is the same, the battery packs cannot be damaged substantially and influence on a system. The fact that the consistency index is larger than the set value indicates that each retired battery pack meets the voltage requirement of an application scene, and the application scene also needs large current, then the battery packs are connected in parallel, the current is the sum of the currents of the retired battery packs, and accordingly the parallel current meets the requirement of the application scene.
In this embodiment, the consistency index is determined by:
Wherein: For consistency index of retired battery packs,/> For capacity index of retired battery pack,/>Is the capacity index weight,/>For the internal resistance index of retired battery pack,/>Is index weight of internal resistance,/>Is the self-discharge rate index of the retired battery pack,/>Is the index weight of self-discharge rate, and/>The weight of each index is distributed according to the actual application scene, and by the mode, an accurate judgment index can be determined, so that an accurate judgment basis is provided for recycling of the retired battery pack, and the accurate recycling of the retired battery pack is facilitated.
In this embodiment, the capacity index of the retired battery pack is determined by the following method：
Wherein: T is the actual ambient temperature, C is the measured maximum available capacity,/>, for the temperature coefficient The subscript i indicates the i-th retired battery pack for the rated capacity of the battery pack, in fact, the capacity factor of the battery pack is more, and the factor with the greatest influence on temperature (although other factors, such as the material state of electrolyte in the battery, electrode factors and the like, are generally difficult to measure, can be processed as an invariable in a certain period of time) and are easy to measure, so that the capacity index of the retired battery pack can be accurately determined based on the model, and an accurate data basis is provided for the subsequent utilization of the retired battery pack and establishment of connection relation.
In this embodiment, the internal resistance index is determined by the following method：
Wherein: is the internal resistance temperature coefficient, T is the ambient temperature,/> Represents the direct current internal resistance measured at 25 ℃ of the ith battery pack,/>For the direct current internal resistance average value of retired battery pack,/>For the actual service time of the ith battery pack,/>Based on the above mode, the influence of the ambient temperature is fully considered in calculating the internal resistance index, so that the accuracy of the subsequent calculation result can be effectively ensured.
In this embodiment, the self-discharge rate indexIs determined by the following method:
Wherein: for sampling the voltage value of the retired battery pack at the starting moment,/> For the voltage value of retired battery pack at the sampling termination time,/>For the time interval between the start and end of the sample,/>For self-discharge temperature coefficient of retired battery pack,/>For the ambient temperature at the start of the sample,/>For the ambient temperature at the moment of the end of the sample,/>Is the humidity coefficient,/>Based on the change value of the ambient humidity from the sampling start time to the sampling end time, the influence of temperature and humidity is fully considered in the self-discharge rate index determining process, so that the accuracy of a final judging result is ensured.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (1)
1. A whole-pack recycling control method of retired battery packs is characterized by comprising the following steps of: the method comprises the following steps:
Acquiring parameter information of the retired battery pack, wherein the parameter information comprises capacity of the retired battery pack, internal resistance of the battery pack and voltage of the battery pack;
determining a consistency index of the retired battery pack based on the parameter information of the retired battery pack;
Determining application requirements, including voltage requirements and current requirements, of the retired battery pack when reapplied;
Dividing the retired battery packs into two groups according to the consistency index being larger than a set value and smaller than the set value, connecting the retired battery packs which are smaller than the set value and meet the application voltage requirement in series, and connecting the retired battery packs which are larger than the set value and meet the current requirement and the voltage requirement in parallel;
the consistency index is determined by:
Index＝aInC+bInR+cInη
Wherein: index is the consistency Index of the retired battery pack, inC is the capacity Index of the retired battery pack, a is the capacity Index weight, inR is the internal resistance Index of the retired battery pack, b is the internal resistance Index weight, inη is the self-discharge rate Index of the retired battery pack, c is the self-discharge rate Index weight, and a+b+c=1;
the capacity index InC of the retired battery pack is determined by the following method:
wherein: τ is a temperature coefficient, T is an actual ambient temperature, C is a measured maximum available capacity, C rc is a rated capacity of a battery pack, and a subscript i represents an ith retired battery pack;
the internal resistance index InR is determined by the following method:
Wherein: τ r is the internal resistance temperature coefficient, T is the ambient temperature, R 25i is the direct current internal resistance measured at 25 ℃ of the ith battery pack, The direct current internal resistance average value of the retired battery pack is t, the actual service time of the ith battery pack is t, and gamma is the time coefficient of the (1, 2) interval;
the self-discharge rate index Inη is determined by:
Wherein: v 1 is the voltage value of the retired battery pack at the sampling start time, V 2 is the voltage value of the retired battery pack at the sampling end time, t S is the time interval between the sampling start time and the end time, For the self-discharge temperature coefficient of the retired battery pack, T 0 is the ambient temperature at the sampling start time, T 1 is the ambient temperature at the sampling end time, epsilon is the humidity coefficient, and delta zeta is the change value of the ambient humidity from the sampling start time to the sampling end time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410063866.0A CN117577977B (en) | 2024-01-17 | 2024-01-17 | Whole-pack recycling control method for retired battery pack |
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| CN202410063866.0A CN117577977B (en) | 2024-01-17 | 2024-01-17 | Whole-pack recycling control method for retired battery pack |
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| CN117577977B true CN117577977B (en) | 2024-04-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118017066B (en) * | 2024-04-10 | 2024-07-02 | 深圳市杰成镍钴新能源科技有限公司 | Control method for gradient utilization of retired battery pack |
| CN118142907B (en) * | 2024-05-09 | 2024-07-12 | 深圳市杰成镍钴新能源科技有限公司 | Configuration method for gradient utilization of retired battery pack |
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| CN107505575A (en) * | 2017-08-10 | 2017-12-22 | 清华四川能源互联网研究院 | A kind of fast evaluation method of retired electrokinetic cell |
| CN109856540A (en) * | 2019-02-14 | 2019-06-07 | 江苏慧智能源工程技术创新研究院有限公司 | A kind of recoverying and utilizing method and stage division of retired battery pack |
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| CN114429050A (en) * | 2022-03-08 | 2022-05-03 | 中国科学院广州能源研究所 | Sorting method for gradient utilization of retired power batteries |
| CN116031523A (en) * | 2023-01-28 | 2023-04-28 | 苏州甲壳虫新能源科技有限公司 | Method for gradient utilization of retired battery |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107505575A (en) * | 2017-08-10 | 2017-12-22 | 清华四川能源互联网研究院 | A kind of fast evaluation method of retired electrokinetic cell |
| CN109856540A (en) * | 2019-02-14 | 2019-06-07 | 江苏慧智能源工程技术创新研究院有限公司 | A kind of recoverying and utilizing method and stage division of retired battery pack |
| CN110752410A (en) * | 2019-10-30 | 2020-02-04 | 上海理工大学 | Method for rapidly sorting and recombining retired lithium batteries |
| CN114429050A (en) * | 2022-03-08 | 2022-05-03 | 中国科学院广州能源研究所 | Sorting method for gradient utilization of retired power batteries |
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