CN114552043A - Management method for lithium ion battery capacity recovery - Google Patents

Management method for lithium ion battery capacity recovery Download PDF

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CN114552043A
CN114552043A CN202210155402.3A CN202210155402A CN114552043A CN 114552043 A CN114552043 A CN 114552043A CN 202210155402 A CN202210155402 A CN 202210155402A CN 114552043 A CN114552043 A CN 114552043A
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battery
capacity
charging
recyclable
recovery
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CN114552043B (en
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曾洪华
曾宪武
蔡锦伟
陈宗发
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Foshan Teamgiant New Energy Technology Co Ltd
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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
    • H01M10/54—Reclaiming serviceable parts of waste accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/24—Querying
    • G06F16/245—Query processing
    • G06F16/2455—Query execution
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/84—Recycling of batteries or fuel cells

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Abstract

The invention discloses a management method for lithium battery capacity recovery, which comprises the steps of obtaining an identification code of a lithium battery, and searching or establishing a data file associated with the identification code; performing n times of charging and discharging operations on the lithium battery, recording the first charging and discharging data into a data file, and sorting out the recyclable battery or the unrecoverable battery according to the first charging and discharging data; grading the recyclable battery according to the first charging and discharging data of the recyclable battery, and performing corresponding capacity recovery operation according to the grade to obtain a capacity recovery battery; performing m-time charging and discharging operations on the capacity recovery battery and recording secondary charging and discharging data of the capacity recovery battery into a data file; the invention carries out corresponding capacity recovery operation and establishes corresponding data files on the lithium battery according to the charging and discharging data, thereby avoiding resource waste, reducing the recovery cost and realizing digital management.

Description

Management method for lithium ion battery capacity recovery
Technical Field
The invention relates to the technical field of lithium battery recovery, in particular to a management method for lithium battery capacity recovery.
Background
The potential for the application of lithium batteries in power supplies and energy storage devices for electric and hybrid vehicles is being increasingly driven. Therefore, the number of lithium batteries shows a tendency to explosive growth on a global scale. Correspondingly, after the lithium battery is used for a long time, the capacity is reduced, the internal resistance is increased, and the potential safety hazard of reuse is increased immediately. In order to solve the problem, the conventional method is to limit the number of times of recycling or the service life of the lithium battery, and the lithium battery which does not exceed the limit can be reused after capacity recovery and put into the market for continuous use.
However, the residual capacities of the recycled lithium batteries are not uniform, the capacity may be as low as 5% or as high as 60%, if a uniform recycling method is adopted, resource waste may be caused, and the recycling cost is increased; and the recovery operation of lithium cell lacks digital management, can not discern whether this lithium cell passes through recovery processing many times, leads to the recovery cost to increase.
Disclosure of Invention
The invention aims to provide a management method for lithium battery capacity recovery, and aims to solve one of the problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a management method for lithium battery capacity recovery, which comprises the following steps:
s100: acquiring an identification code of a lithium battery, and searching or establishing a data file associated with the identification code;
s200: performing n times of charging and discharging operations on the lithium battery, recording first charging and discharging data into the data file, and sorting recyclable batteries or non-recyclable batteries according to the first charging and discharging data;
s300: grading the recyclable battery according to the first charging and discharging data of the recyclable battery, and performing corresponding capacity recovery operation according to the grade to obtain a capacity recovery battery;
s400: and performing m-time charging and discharging operations on the capacity recovery battery, and recording secondary charging and discharging data of the capacity recovery battery into the data file.
Compared with the prior art, the method has the advantages that the data file corresponding to the battery identification code is searched or established, the charging and discharging data generated in the charging and discharging operation process of the lithium battery are recorded into the data file for storage, the recyclable battery and the non-recyclable battery are sorted and the grade of the recyclable battery is divided according to the charging and discharging data, and the corresponding capacity recovery operation is carried out according to the grade, so that the targeted recovery is realized, the resource waste is avoided, and the recovery cost is reduced; meanwhile, digital management is realized through establishment of the data files, the lithium batteries which are recycled for many times can be identified, and the recycling cost is reduced.
In a preferred embodiment, the S100 is specifically: acquiring image information of the lithium battery, extracting an identification code of the lithium battery, and searching a database for a data file associated with the identification code of the lithium battery;
if the corresponding data file is found, acquiring the product information of the data file;
and if the corresponding data file is not found, manually inputting the identification code of the lithium battery, establishing the data file corresponding to the identification code, and inputting the battery information of the lithium battery into the data file.
In a preferred embodiment, the identification code comprises one of a serial code and a two-dimensional code, and a combination of a serial code and a bar code.
In a preferred embodiment, the first charge and discharge data includes a battery capacity and an average battery capacity in each charging operation.
In a preferred embodiment, the S200 includes:
s210: performing charging and discharging operation on the lithium battery for n times to obtain first charging and discharging data, and recording the first charging and discharging data into the data file;
s220: and processing the first charging and discharging data according to a first operation formula to obtain first battery capacity, comparing the first battery capacity with a recovery standard, and judging that the current lithium battery is a recyclable battery when the first battery capacity is higher than the recovery standard, or judging that the current lithium battery is an unrecoverable battery if the first battery capacity is not higher than the recovery standard.
Further, the first operation formula is as follows:
Figure BDA0003512126620000031
wherein n is not less than 5, B (a) is the first battery capacity,
Figure BDA0003512126620000032
to average cell capacity, Bn-2，Bn-1，BnThe data of the battery capacity in the last 3 charge and discharge operations are respectively.
In a preferred embodiment, the S300 includes:
s310: processing the first charging and discharging data of the recyclable battery according to a second operation formula to obtain a second battery capacity, and finding a recycling grade corresponding to the second battery capacity by combining a battery capacity grading table;
s320: finding an SEI film damaging agent and an SEI film repairing agent corresponding to the grade according to the recycling grade corresponding to the recyclable battery;
s330: performing a capacity recovery operation on the recyclable battery in cooperation with the SEI film disrupting agent and the SEI film repairing agent.
Further, the second operation formula is:
Figure BDA0003512126620000033
wherein n is not less than 5, B (c) is the second battery capacity,
Figure BDA0003512126620000034
to average cell capacity, Bn-2，Bn-1，BnThe data of the battery capacity in the last 3 charge and discharge operations are respectively.
In a preferred embodiment, the S330 includes:
s331: opening a liquid injection hole of the recyclable battery in inert gas and discharging the electrolyte;
s332: adding a first mixing agent into the recyclable battery and oscillating for 1-8 hours under the ultrasonic condition;
wherein the first blending agent accounts for 60% to 85% of a space in the recyclable battery, and the destruction blending agent includes a first electrolyte and an SEI film breaking agent corresponding to a recycling grade of the recyclable battery;
s333: adding a second mixing agent into the recyclable battery, closing the liquid injection hole, and standing for 24-72 hours; wherein the second admixture occupies 15 to 40% of a space in the recyclable battery, and the destruction admixture includes a second electrolyte and an SEI film repair agent corresponding to a recycling grade of the recyclable battery.
In a preferred embodiment, the S500 is specifically: and processing the secondary charge and discharge data to obtain the factory average capacity of the battery, comparing the factory average capacity with a factory requirement standard, judging that the battery is not recyclable when the factory average capacity of the battery is lower than the factory requirement standard, and otherwise, judging that the battery is qualified.
For a better understanding and practice, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic flow diagram of the present application.
Detailed Description
In order to better illustrate the invention, the invention is described in further detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the claims that follow. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The invention provides a management method for lithium battery capacity recovery, which comprises the following steps:
s100: acquiring an identification code of a lithium battery, and searching or establishing a data file associated with the identification code;
this application is through collecting the lithium cell, and put a plurality of lithium cells on the conveyer belt on the line is produced in the recovery, the conveyer belt transports a plurality of lithium cells one by one in the identification cell, identification cell's camera is shot the one side that has the identification code of lithium cell, acquire the image information of lithium cell and upload to the system in, the identification code of system in to this image is discerned and is drawed, thereby acquire the identification code of current lithium cell, and search or establish the data archives associated with this identification code in the database according to this identification code, so that carry out data call or data entry in the follow-up processing procedure, provide the basis for digital management.
Specifically, as for the data file related to the identification code of the lithium battery searched in the database, the data file can be searched in the database in a traversal method; if finding a corresponding data file, acquiring product information of the data file so as to perform data calling or data entry, wherein the product information comprises the model, the rated capacity, the working voltage, the working current, factory data and the like of the current lithium battery; if the corresponding data file is not found, a worker is required to manually input the identification code of the lithium battery, establish the data file corresponding to the identification code, and input the battery information of the lithium battery into the data file, wherein the battery information comprises the model, the rated capacity, the working voltage, the working current and the like of the current lithium battery.
The lithium batteries recovered by the method are all lithium batteries with identification codes, and the identification codes are arranged on the outer surfaces of the lithium batteries; wherein, the identification code comprises a serial code and a two-dimensional code or one combination of the serial code and a bar code. If the lithium battery does not have any identification code or cannot be identified by the identification code, the lithium battery does not belong to the range of the lithium battery recycled by the application.
Preferably, the identification code is a combination of a sequence code and a two-dimensional code, and is arranged on the outer surface of the lithium battery in a laser marking or ink printing mode, the two-dimensional code is scanned by a camera, and the sequence code corresponding to the two-dimensional code can be obtained by matching with a two-dimensional code identification technology commonly used in the field, and regarding technologies for identifying the two-dimensional code in image information and decoding the two-dimensional code, the commonly used technology in the field can be adopted, and the invention is not limited to this; when the two-dimensional code is unidentifiable, a worker is required to manually input the sequence code into the database to search or establish the data file.
S200: performing n times of charging and discharging operations on the lithium battery, recording first charging and discharging data into the data file, and sorting recyclable batteries or non-recyclable batteries according to the first charging and discharging data;
after the lithium battery searches or establishes the data file in the identification unit, the lithium battery is conveyed to the charge and discharge all-in-one machine along with the conveyor belt, the charge and discharge operation is carried out on the lithium battery for n times by means of the charge and discharge all-in-one machine, the first charge and discharge data are uploaded to the system and are recorded into the data file corresponding to the lithium battery for data recording, and therefore the lithium battery is sorted in the subsequent process. In one embodiment, the first charge and discharge data includes a battery capacity and an average battery capacity in each charging operation.
Specifically, the step S200 specifically includes:
s210: the charging and discharging integrated machine carries out charging and discharging operation on the lithium battery for n times to obtain first charging and discharging data, and the first charging and discharging data are recorded into the data file so as to be convenient for data calling on the first charging and discharging data in the subsequent processing process;
s220: the system calls the first charge-discharge data in the data file of the lithium battery according to a first operation formula
Figure BDA0003512126620000061
And processing the first charging and discharging data to obtain first battery capacity, comparing the first battery capacity with a recovery standard, and judging that the current lithium battery is a recyclable battery when the first battery capacity is higher than the recovery standard, otherwise, judging that the current lithium battery is an unrecoverable battery. Wherein the recovery standard is that the battery capacity is kept above 20% of the rated capacity.
This application is compared through first battery capacity and recovery standard, selects the lithium cell that has the retrieval value to carry out the pertinence processing to the lithium cell, when the lithium cell is recoverable battery, carry out the capacity recovery operation, and when the lithium cell is non-recoverable battery, carry out the partition recovery operation, with the partition recovery processing such as shell, electrode, electrolyte of lithium cell, thereby effectively reduce the recovery cost. Preferably, the present application sorts the recyclable battery and the non-recyclable battery by the sorting unit, and transfers the recyclable battery and the non-recyclable battery to the designated unit by the transfer belt to perform corresponding operations.
In one embodiment, the sorting unit may be a reversing device having an entrance end and a first output end and a second output end, the entrance end is butted with a conveyor belt of the charge and discharge all-in-one machine, the first output end is butted with a conveyor belt of the process of the capacity recovery operation, the second output end is butted with a conveyor belt of the process of the separation and recovery operation, and sorting is realized by changing the output direction.
Further, after the applicant has performed a plurality of times of experimental measurements and experimental data, the applicant calculates the first operation formula as:
Figure BDA0003512126620000071
wherein n is not less than 5, B (a) is the first battery capacity,
Figure BDA0003512126620000072
to average cell capacity, Bn-2，Bn-1，BnThe data of the battery capacity in the last 3 charge and discharge operations are respectively. According to the method and the device, the recoverable battery and the unrecoverable battery can be effectively sorted out through the first battery capacity obtained by weighting the first operation formula, so that the lithium battery with the recovery value is subjected to capacity recovery operation, the recovery cost is reduced, and the recovery efficiency is improved.
S300: grading the recyclable battery according to the first charging and discharging data of the recyclable battery, and performing corresponding capacity recovery operation according to the grade to obtain a capacity recovery battery;
this application is through the first charge-discharge data in the data archives of system call this lithium cell and handle first charge-discharge data to carry out hierarchical processing to recoverable battery. Wherein the first charge and discharge data includes a battery capacity and an average battery capacity in each charging operation.
Specifically, the S300 specifically includes:
s310: processing the first charging and discharging data of the recyclable battery according to a second operation formula to obtain a second battery capacity, and finding a recycling grade corresponding to the second battery capacity by combining a battery capacity grading table (namely table 1); the recycling grade of the recyclable battery in the battery capacity grading table is determined through the capacity of the second battery, so that corresponding operation can be performed according to the recycling grade in subsequent processing.
Further, after a plurality of times of experimental measurements and experimental data of the applicant, the applicant calculates the second operation formula as:
Figure BDA0003512126620000081
wherein n is not less than 5, B (c) is the second battery capacity,
Figure BDA0003512126620000082
to average cell capacity, Bn-2，Bn-1，BnThe data of the battery capacity in the last 3 charge and discharge operations are respectively. According to the method and the device, the recovery grade corresponding to the recyclable battery can be effectively determined through the second battery capacity obtained by weighting the second operation formula, so that the recyclable battery is subjected to targeted capacity recovery operation, the recovery cost is reduced, and the recovery efficiency is improved.
S320: finding an SEI film damaging agent and an SEI film repairing agent corresponding to the grade according to the recycling grade corresponding to the recyclable battery; the application aims at operating the recyclable battery by corresponding different SEI film damaging agents and SEI film repairing agents according to recycling grades.
TABLE 1
Figure BDA0003512126620000083
Figure BDA0003512126620000091
It should be noted that the more complete the SEI film is formed, the more effective the SEI film is in preventing the reaction between the electrode and the electrolyte, and the longer the service life of the lithium battery can be increased. In a lithium battery, the battery capacity is restored by adding a SEI film repair agent. The film forming agent of the SEI film is supplemented into the battery after the battery is placed for a certain time, but although the development of the SEI film is promoted, the initial state of the battery is not recovered, and the SEI film on the surface of the electrode becomes thicker and is far away from the initial state of the lithium battery, so that the capacity of the battery is not effectively recovered. To this end, the SEI film breaking agent of the present application includes one or more of distilled water, acetic acid, sulfuric acid, ethyl acetate; the SEI film repair agent of the present application includes one or more of vinylene sulfate, vinyl sulfite, sulfur dioxide, and propylene sulfite.
S330: performing a capacity recovery operation on the recyclable battery in cooperation with the SEI film disrupting agent and the SEI film repairing agent. The capacity recovery operation specifically includes:
s331: opening a liquid injection hole of the recyclable battery in inert gas and discharging the electrolyte;
preferably, the recyclable battery can be dried after the recyclable battery discharges the electrolyte, the drying temperature is 40-100 ℃, and the drying time is 5-24 hours;
s332: adding a first mixing agent into the recyclable battery and oscillating for 1-8 hours under the ultrasonic condition; wherein the first blending agent accounts for 60% to 85% of a space in the recyclable battery, and the destruction blending agent includes a first electrolyte and an SEI film breaking agent corresponding to a recycling grade of the recyclable battery; the ultrasonic wave and the first mixing agent are matched to work, the SEI film of the pole piece is damaged through physical and chemical methods, and physical damage to the pole piece can be avoided.
S333: adding a second mixing agent into the recyclable battery, closing the liquid injection hole, and standing for 24-72 hours; wherein the second blending agent accounts for 15% to 40% of a space in the recyclable battery, and the destruction blending agent includes a second electrolyte and an SEI film repair agent corresponding to a recycling grade of the recyclable battery.
The first electrolyte and the second electrolyte are new electrolytes, and the amount of the new electrolytes is the same as the mass of the old electrolytes discharged.
S400: performing m-time charging and discharging operations on the capacity recovery battery and recording secondary charging and discharging data of the capacity recovery battery into the data file; wherein m is more than or equal to 5; this application is through logging into capacity recovery battery's secondary charge and discharge data in the data archives to carry out data calling to this lithium cell information when subsequent maintenance or sale etc. also can make things convenient for this lithium cell when retrieving next time, can directly know whether this lithium cell has carried out the recovery operation.
Compared with the prior art, the method has the advantages that the data file corresponding to the battery identification code is searched or established, the charging and discharging data generated in the charging and discharging operation process of the lithium battery are recorded into the data file for storage, the recyclable battery and the non-recyclable battery are sorted and the grade of the recyclable battery is divided according to the charging and discharging data, and the corresponding capacity recovery operation is carried out according to the grade, so that the targeted recovery is realized, the resource waste is avoided, and the recovery cost is reduced; meanwhile, digital management is realized through establishment of the data files, the lithium batteries which are recycled for many times can be identified, and the recycling cost is reduced.
S500: and processing the secondary charge and discharge data to obtain the factory average capacity of the battery, comparing the factory average capacity with a factory requirement standard, judging that the battery is not recyclable when the factory average capacity of the battery is lower than the factory requirement standard, and otherwise, judging that the battery is qualified. Wherein the factory requirement standard is that the battery capacity is kept above 80% of the rated capacity.
According to the method and the device, the battery capacity obtained through m times of charging and discharging operations is averaged to obtain the factory average capacity of the battery, and whether the battery can be factory or not can be judged quickly by comparing the factory average capacity of the battery with factory requirement standards so as to execute corresponding operations.
Example 1
The 100Ah lithium battery is placed on a battery charging and discharging integrated machine for 5 times of charging and discharging operations, the battery capacities of the 5 times of charging and discharging operations are tested to be 23.1Ah, 23.3Ah, 23.2Ah, 23.0Ah and 22.8Ah respectively, the average battery capacity is 23.1Ah, the first battery capacity is calculated to be 23.0Ah, the second battery capacity is calculated to be 23.0Ah, and the capacity of the lithium battery accounts for 23.0% of the rated capacity and belongs to a recyclable battery. The method comprises the following steps of (1) carrying out electricity elimination treatment on a lithium battery, placing the lithium battery after electricity elimination in an environment filled with nitrogen, opening a liquid injection hole of the lithium battery, and pouring out electrolyte in a battery shell; after drying treatment is carried out for 5 hours at the temperature of 40 ℃, injecting a first mixing agent (electrolyte and acetic acid with the mass ratio of 4.6%), wherein the first mixing agent accounts for 60% of the space in the lithium battery, carrying out ultrasonic oscillation for 1 hour, then injecting a second mixing agent (electrolyte and ethylene sulfite with the mass ratio of 5.1%), wherein the second mixing agent accounts for 40% of the space in the lithium battery, and closing a battery injection hole; after the lithium battery is kept stand for 24 hours, 5 times of charging and discharging are carried out on the charging and discharging integrated machine, the battery capacity of 5 times of charging and discharging operations is tested to be 82.2Ah, 81.3Ah, 83.2Ah, 82.6Ah and 81.2Ah respectively, the factory average capacity of the battery is 82.1Ah, and the factory average capacity of the battery can be recovered to 82.1% of the rated capacity of the battery.
Example 2
The 100Ah lithium battery is placed on a battery charging and discharging integrated machine for 5 times of charging and discharging operations, the battery capacities of the 5 times of charging and discharging operations are respectively 26.5Ah, 26.4Ah, 26.9Ah, 27.2Ah, 26.8Ah and the average battery capacity of 26.8Ah, the first battery capacity of 26.9Ah and the second battery capacity of 26.9Ah are obtained through calculation, and the capacity of the lithium battery accounts for 26.9% of the rated capacity and belongs to a recyclable battery. The method comprises the following steps of (1) carrying out electricity elimination treatment on a lithium battery, placing the lithium battery after electricity elimination in an environment filled with nitrogen, opening a liquid injection hole of the lithium battery, and pouring out electrolyte in a battery shell; after drying treatment is carried out for 5 hours at the temperature of 50 ℃, injecting a first mixing agent (electrolyte and acetic acid with the mass ratio of 3.7%), wherein the first mixing agent accounts for 65% of the space in the lithium battery, carrying out ultrasonic oscillation for 1 hour, then injecting a second mixing agent (electrolyte and ethylene sulfite with the mass ratio of 3.5%), wherein the second mixing agent accounts for 35% of the space in the lithium battery, and closing a battery injection hole; after the lithium battery is kept stand for 24 hours, 5 times of charging and discharging are carried out on the charging and discharging integrated machine, the battery capacity of 5 times of charging and discharging operations is tested to be 82.6Ah, 82.4Ah, 82.0Ah, 81.3Ah and 81.1Ah respectively, the factory average capacity of the battery is 81.9Ah, and the rated capacity of the battery can be recovered to be 81.9 percent.
Example 3
The 100Ah lithium battery is placed on a battery charging and discharging integrated machine for 5 times of charging and discharging operations, the battery capacities of the 5 times of charging and discharging operations are tested to be 32.8Ah, 33.6Ah, 32.8Ah, 32.9Ah, 32.6Ah and the average battery capacity 32.9.08Ah respectively, the first battery capacity is calculated to be 32.8Ah, the second battery capacity is calculated to be 32.8Ah, and the capacity of the lithium battery accounts for 32.8% of the rated capacity and belongs to a recyclable battery. The method comprises the following steps of (1) carrying out electricity elimination treatment on a lithium battery, placing the lithium battery after electricity elimination in an environment filled with nitrogen, opening a liquid injection hole of the lithium battery, and pouring out electrolyte in a battery shell; after drying treatment is carried out for 5 hours at the temperature of 50 ℃, injecting a first mixing agent (electrolyte and 2.8 mass percent of acetic acid), wherein the first mixing agent accounts for 60 percent of the space in the lithium battery, carrying out ultrasonic oscillation for 1 hour, then injecting a second mixing agent (electrolyte and 2.5 mass percent of ethylene sulfite), wherein the second mixing agent accounts for 40 percent of the space in the lithium battery, and closing a battery injection hole; after the lithium battery is kept stand for 24 hours, 5 times of charging and discharging are carried out on the charging and discharging integrated machine, the battery capacity of 5 times of charging and discharging operations is tested to be 83.3Ah, 82.8Ah, 81.6Ah, 82.4Ah and 82.2Ah respectively, the factory average capacity of the battery is 82.4Ah, and the factory average capacity of the battery can be recovered to 82.4% of the rated capacity of the battery.
Example 4
The 100Ah lithium battery is placed on a battery charging and discharging integrated machine for 5 times of charging and discharging operations, the battery capacities of the 5 times of charging and discharging operations are respectively 38.3Ah, 38.8Ah, 39.2Ah, 37.1Ah, 37.5Ah and the average battery capacity of 38.2Ah, the first battery capacity of 38.0Ah and the second battery capacity of 37.8Ah are obtained through calculation, and the capacity of the lithium battery accounts for 38.0% of the rated capacity and belongs to a recyclable battery. The method comprises the following steps of (1) carrying out electricity elimination treatment on a lithium battery, placing the lithium battery after electricity elimination in an environment filled with nitrogen, opening a liquid injection hole of the lithium battery, and pouring out electrolyte in a battery shell; after drying treatment is carried out for 5 hours at the temperature of 50 ℃, injecting a first mixing agent (electrolyte and 1.6 mass percent of acetic acid), wherein the first mixing agent accounts for 65 percent of the space in the lithium battery, carrying out ultrasonic oscillation for 1 hour, then injecting a second mixing agent (electrolyte and 1.5 mass percent of ethylene sulfite), wherein the second mixing agent accounts for 35 percent of the space in the lithium battery, and closing a battery injection hole; after the lithium battery is kept still for 24 hours, 5 times of charging and discharging are carried out on the charging and discharging integrated machine, the battery capacity of 5 times of charging and discharging operations is tested to be 83.4Ah, 83.2Ah, 83.0Ah, 83.1Ah and 83.1Ah respectively, the factory average capacity of the battery is 83.1Ah, and the factory average capacity of the battery can be recovered to 83.1% of the rated capacity of the battery.
Example 5
The 100Ah lithium battery is placed on a battery charging and discharging integrated machine for 5 times of charging and discharging operations, the battery capacities of the 5 times of charging and discharging operations are respectively 43.1Ah, 43.4Ah, 44.2Ah, 44.1Ah, 42.8Ah and the average battery capacity 43.5Ah, the first battery capacity 43.6Ah and the second battery capacity 43.4Ah are obtained through calculation, and the capacity of the lithium battery accounts for 43.6% of the rated capacity and belongs to a recyclable battery. The method comprises the following steps of (1) carrying out electricity elimination treatment on a lithium battery, placing the lithium battery after electricity elimination in an environment filled with nitrogen, opening a liquid injection hole of the lithium battery, and pouring out electrolyte in a battery shell; after drying treatment is carried out for 5 hours at the temperature of 50 ℃, injecting a first mixing agent (electrolyte and 0.9 mass percent of acetic acid), wherein the first mixing agent accounts for 70 percent of the space in the lithium battery, carrying out ultrasonic oscillation for 1 hour, then injecting a second mixing agent (electrolyte and 0.9 mass percent of ethylene sulfite), wherein the second mixing agent accounts for 30 percent of the space in the lithium battery, and closing a battery injection hole; after the lithium battery is kept stand for 24 hours, charging and discharging are carried out for 5 times on a charging and discharging integrated machine, the battery capacity of 5 times of charging and discharging operations is tested to be 83.9Ah, 83.7Ah, 84.1Ah, 84.2Ah and 84.4Ah respectively, the factory average capacity of the battery is 84.1Ah, and the factory average capacity of the battery can be recovered to 84.1% of the rated capacity of the battery.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. A management method for lithium battery capacity recovery is characterized by comprising the following steps:
s100: acquiring an identification code of a lithium battery, and searching or establishing a data file associated with the identification code;
s200: performing n times of charging and discharging operations on the lithium battery, recording first charging and discharging data into the data file, and sorting recyclable batteries or non-recyclable batteries according to the first charging and discharging data;
s300: grading the recyclable battery according to the first charging and discharging data of the recyclable battery, and performing corresponding capacity recovery operation according to the grade to obtain a capacity recovery battery;
s400: and performing m-time charging and discharging operations on the capacity recovery battery, and recording secondary charging and discharging data of the capacity recovery battery into the data file.
2. The method for managing the recovery of the capacity of a lithium battery according to claim 1, characterized in that:
the S100 specifically comprises the following steps: acquiring image information of the lithium battery, extracting an identification code of the lithium battery, and searching a data file related to the identification code of the lithium battery in a database;
if the corresponding data file is found, acquiring the product information of the data file;
and if the corresponding data file is not found, manually inputting the identification code of the lithium battery, establishing the data file corresponding to the identification code, and inputting the battery information of the lithium battery into the data file.
3. The management method for lithium battery capacity recovery as claimed in claim 2, wherein:
the identification code comprises one combination of a serial code and a two-dimensional code, and the serial code and the bar code.
4. The method for managing the recovery of the capacity of a lithium battery according to claim 1, characterized in that:
the first charge and discharge data includes a battery capacity and an average battery capacity in each charging operation.
5. The method for managing the recovery of the lithium battery capacity according to claim 4, wherein the step S200 comprises:
s210: performing charging and discharging operation on the lithium battery for n times to obtain first charging and discharging data, and recording the first charging and discharging data into the data file;
s220: and processing the first charging and discharging data according to a first operation formula to obtain first battery capacity, comparing the first battery capacity with a recovery standard, and judging that the current lithium battery is a recyclable battery when the first battery capacity is higher than the recovery standard, or judging that the current lithium battery is an unrecoverable battery if the first battery capacity is not higher than the recovery standard.
6. The method for managing the recovery of the capacity of a lithium battery according to claim 5, characterized in that:
the first operation formula is as follows:
Figure FDA0003512126610000021
wherein n is not less than 5, B (a) is the first battery capacity,
Figure FDA0003512126610000022
to average cell capacity, Bn-2，Bn-1，BnThe data of the battery capacity in the last 3 charge and discharge operations are respectively.
7. The method for managing the recovery of the lithium battery capacity according to claim 4, wherein the step S300 comprises:
s310: processing the first charging and discharging data of the recyclable battery according to a second operation formula to obtain second battery capacity, and finding out a recycling grade corresponding to the second battery capacity by combining a battery capacity grading table;
s320: finding an SEI film damaging agent and an SEI film repairing agent corresponding to the grade according to the recycling grade corresponding to the recyclable battery;
s330: performing a capacity recovery operation on the recyclable battery in cooperation with the SEI film disrupting agent and the SEI film repairing agent.
8. The method for managing the recovery of the capacity of a lithium battery according to claim 7, characterized in that:
the second operational formula is as follows:
Figure FDA0003512126610000031
wherein n is not less than 5, B (c) is the second battery capacity,
Figure FDA0003512126610000032
to average cell capacity, Bn-2，Bn-1，BnThe data of the battery capacity in the last 3 charge and discharge operations are respectively.
9. The method for managing the recovery of the lithium battery capacity according to claim 7, wherein the step S330 includes:
s331: opening a liquid injection hole of the recyclable battery in inert gas and discharging the electrolyte;
s332: adding a first mixing agent into the recyclable battery and oscillating for 1-8 hours under the ultrasonic condition;
wherein the first blending agent accounts for 60% to 85% of a space in the recyclable battery, and the destruction blending agent includes a first electrolyte and an SEI film breaking agent corresponding to a recycling grade of the recyclable battery;
s333: adding a second mixing agent into the recyclable battery, closing the liquid injection hole, and standing for 24-72 hours; wherein the second blending agent accounts for 15% to 40% of a space in the recyclable battery, and the destruction blending agent includes a second electrolyte and an SEI film repair agent corresponding to a recycling grade of the recyclable battery.
10. The method for managing the recovery of the capacity of a lithium battery according to claim 1, characterized in that:
s500: and processing the secondary charge and discharge data to obtain the factory average capacity of the battery, comparing the factory average capacity with a factory requirement standard, judging that the battery is not recyclable when the factory average capacity of the battery is lower than the factory requirement standard, and otherwise, judging that the battery is qualified.
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CN110021796A (en) * 2018-01-09 2019-07-16 深圳市普兰德储能技术有限公司 A kind of method that retired battery recycling recycles
CN110380103A (en) * 2019-08-01 2019-10-25 浙江锋锂新能源科技有限公司 A kind of method, the system, storage medium of high-resolution screening combo lithium battery

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JP2011175935A (en) * 2010-02-25 2011-09-08 Toyota Motor Corp Method for recovering capacity of lithium-ion secondary battery and method for determining state of the lithium-ion secondary battery
CN101950819A (en) * 2010-09-13 2011-01-19 长春劲能锂电池科技有限公司 Method for restoring capacity of lithium ion power battery
CN103187595A (en) * 2013-03-18 2013-07-03 常州大学 Maintenance method for capacity recovery type lithium ion battery
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