CN113054233B - Configuration method of lithium battery restorative and maintenance and repair method of lithium battery pack - Google Patents
Configuration method of lithium battery restorative and maintenance and repair method of lithium battery pack Download PDFInfo
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- CN113054233B CN113054233B CN202110272107.1A CN202110272107A CN113054233B CN 113054233 B CN113054233 B CN 113054233B CN 202110272107 A CN202110272107 A CN 202110272107A CN 113054233 B CN113054233 B CN 113054233B
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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
- H01M10/4242—Regeneration of electrolyte or reactants
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- 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
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- 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
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/38—Collecting or arranging articles in groups
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The preparation method of the lithium battery restoration agent comprises the steps of adding graphene into lithium ion battery electrolyte stock solution, fully stirring for 60 minutes in a stirring tank, and obtaining the lithium battery restoration agent after no precipitate is visually observed through a stirring tank observation hole. A lithium battery pack maintenance and assembly method comprises the following steps: selecting available lithium battery packs, and eliminating unqualified battery cells; opening a pinhole of the selected battery core of the available lithium battery pack in a negative pressure state, and quantitatively adding a lithium battery restorer; hole repairing is carried out on the battery core of the lithium battery pack in a welding mode under the negative pressure state; and after the lithium battery cell obtained in the previous step is detected, assembling the lithium battery cell reaching the detection standard into a finished lithium battery. The old lithium battery pack can be recycled normally again, the scrappage of lithium batteries in the market is reduced, the service cycle of the lithium batteries is prolonged, and the serious environmental pollution in the disassembly and extraction process after the scrappage of the lithium batteries is avoided.
Description
Technical Field
The application relates to the field of lithium batteries, in particular to a configuration method of a lithium battery restorative and a maintenance and assembly method of a lithium battery pack adopting the lithium battery restorative.
Background
Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a positive/negative electrode material. Lithium metal batteries were first proposed and studied by Gilbert n.lewis in 1912. At 70 s of the 20 th century, m.s. whittingham proposed and began to study lithium ion batteries. The chemical characteristics of lithium metal are very active, so that the processing, storage and use of lithium metal have very high requirements on environment. With the development of science and technology, lithium batteries have become the mainstream.
The cost of the lithium battery is higher, at present, the old lithium battery pack is difficult to recycle, the scrappage of the lithium battery in the market is more, the disassembly and extraction process after the scrappage of the lithium battery is easy to produce serious environmental pollution, and more social resource waste is caused.
Disclosure of Invention
In view of the above situation, in order to solve the problems of the above technology, the present application provides a configuration method of a lithium battery restorer and a maintenance and repair method of a lithium battery pack, which enable an old lithium battery pack to be recycled normally again, reduce the scrapping amount of lithium batteries in the market, prolong the service cycle of the lithium batteries, and facilitate avoiding serious environmental pollution in the disassembly and extraction process after the scrapping of the lithium batteries.
The preparation method of the lithium battery restoration agent comprises the steps of adding graphene into lithium ion battery electrolyte stock solution, fully stirring for 60 minutes in a stirring tank, and obtaining the lithium battery restoration agent after no precipitate is visually observed through a stirring tank observation hole.
According to the preparation method of the lithium battery restoration agent, the lithium ion battery electrolyte stock solution is prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
According to the preparation method of the lithium battery restoration agent, the weight ratio of the lithium ion battery electrolyte stock solution to the graphene is 1000000:2.
a lithium battery pack maintenance and assembly method comprises the following steps:
selecting available lithium battery packs, and eliminating unqualified battery cells;
opening a pinhole of the selected battery core of the available lithium battery pack in a negative pressure state, and quantitatively adding a lithium battery restorer;
hole repairing is carried out on the battery core of the lithium battery pack in a welding mode under the negative pressure state;
and after the lithium battery cell obtained in the previous step is detected, assembling the lithium battery cell reaching the detection standard into a finished lithium battery.
According to the maintenance and assembly method of the lithium battery pack, the available lithium battery pack is selected, and unqualified battery cells are removed, wherein the lithium battery pack is firstly charged, discharged and recharged through a voltage balancing instrument, and the lithium battery pack is circulated for three times, so that the voltage of each battery cell string of the lithium battery pack is recovered and corrected as much as possible; integrally disassembling the outer package of the lithium battery pack, measuring the voltages of all strings, and removing single strings with lower voltages, wherein the ternary battery removes single strings with lower voltages than 3.7V, and the lithium iron removes single strings with lower voltages than 3.2V; dividing a single-string battery cell with low voltage into charging and discharging capacity of each channel by using a lithium capacitance detector, and removing the battery cell with low voltage and capacity again; replacing the removed battery cells with standard voltage and capacity to reconstruct the lithium battery pack. The method judges the internal use degree of the battery according to the detection data, eliminates the battery core thoroughly damaged by the battery pack to select the available lithium battery pack, is quick and convenient, and is suitable for the battery pack with not too high requirements on the use environment.
According to the maintenance and assembly method for the lithium battery pack, disclosed by the application, the available lithium battery pack is selected, unqualified battery cells are removed, the battery pack outer package is disassembled integrally, all the battery cells are taken out, and the battery cells with the approximate capacity are selected to be placed in a turnover box through capacity-division detection pairing by a detector of a matching channel; sorting the lithium battery cores with good capacity consistency by an automatic sorting machine according to voltage and internal resistance, and placing the selected lithium battery cores in a turnover box, wherein the voltage and the internal resistance are close to each other; and assembling the finished lithium battery pack by adopting the detected lithium battery cell. The method judges the internal use degree of the battery according to the detection data, strictly detects, re-pairs, eliminates the battery cells with unmatched capacity and voltage to select the available lithium battery pack, strictly detects, and is suitable for the battery pack with high use environment requirements. The capacity recovery is close to that of a brand new lithium battery, and the high-current discharge performance is good. And the method is particularly suitable for the application with high requirement on the use cycle times of the lithium battery pack.
After the technology provided by the application is adopted, the configuration method of the lithium battery restorative and the maintenance and repair method of the lithium battery pack have the following beneficial effects:
the electrolyte filled between the positive and negative electrodes needs to have good conductivity in addition to being stable, and the internal resistance of the battery is minimized. Based on the method, according to the configuration method of the lithium battery restorative and the maintenance and repair method of the lithium battery pack, graphene is added into the lithium ion battery electrolyte stock solution, so that the capacity of the lithium ion battery after high-current charge and discharge and multiple charge and discharge is stable is enhanced, and the capacity reduction of the battery after multiple charge and discharge cycles is reduced.
According to the configuration method of the lithium battery restorative and the maintenance and repair method of the lithium battery pack, unqualified battery cells are removed through complete and thorough detection, the finished lithium battery pack is reassembled by adding the restorative according to the pairing of the voltage, the internal resistance and the capacity of the battery cells and the specific negative pressure, the capacity of the battery pack is obviously restored, and the number of times of recycling charge and discharge is increased. The internal resistance of the lithium ion battery is reduced by more than 30% through the detection of the special detector, the electric quantity of the lithium ion battery is reduced slowly in the starting and climbing processes of the vehicle, the power is obviously improved, and the distance is doubled compared with the battery pack before detection, pairing and recovery. The service life is prolonged by more than one time, and the charge and discharge times of the repaired up-to-standard battery pack reach about 800-1000 times. The method realizes the normal recycling of the old lithium battery pack again, reduces the scrappage of the lithium battery in the market, prolongs the service cycle of the lithium battery, and reduces the serious environmental pollution in the disassembly and extraction process after the scrappage of the lithium battery.
Detailed Description
Various preferred embodiments of the present application will be described below. The following description is provided to aid in the understanding of the exemplary embodiments of the application as defined by the claims and their equivalents. It includes various specific details that aid in understanding, but they are to be considered exemplary only. Accordingly, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the application. Moreover, a detailed description of functions and configurations well known in the art will be omitted for the sake of clarity and conciseness of the present specification.
Example 1
1. The available ternary lithium battery pack 14 string (nominal voltage capacity 48V-20 AH) is selected, the actual detection capacity is 11AH, and the nominal battery cell 18650-2000mah is selected.
2. And (3) charging, discharging and recharging the special voltage balancing instrument for the lithium battery, and circulating for three times to recover and correct the voltage of each string of battery cells of the lithium battery pack as much as possible, and fully charging the whole voltage to 56V.
3. And integrally disassembling the outer package of the battery pack, measuring the voltage of each string by using a universal meter, wherein each string of the ternary battery cannot be lower than 3.7V, and eliminating single strings with obviously lower voltage.
4. And (3) dividing the single-string battery cells with low voltage into each channel to measure the capacity by using a special capacity-dividing detector for lithium capacitance, and eliminating the battery cells with obviously lower voltage and capacity and obviously inclined discharge curves.
5. And the battery pack is recombined by poorly replaced battery cells with up-to-standard voltage and capacity.
6. The capacity of the battery pack is detected by a lithium battery capacity detector, and the actual capacity is detected by 10A discharge and is 48V-15AH.
Example 2
1. The available ternary lithium battery pack 14 string (nominal voltage capacity 48V-20 AH) is selected, the actual detection capacity is 11AH, and the nominal battery cell 18650-2000mah is selected.
2. And integrally disassembling the outer package of the battery pack, taking out all the battery cells, arranging a capacity-dividing detector of a special matching channel, carrying out capacity-dividing detection pairing, connecting a computer, and arranging the battery cells in a turnover box in a very similar way according to the capacity displayed by the computer.
3. The lithium battery core with good capacity consistency is subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the capacity of the lithium battery core reaches over 1700mah, and the error of 0.1V and the capacity error of 10mah are matched in the same turnover box.
3. And (3) assembling the lithium battery pack finished product by using special equipment for the lithium battery cell reaching the detection standard.
4. The capacity of the battery pack is detected by a lithium battery capacity detector, and the actual capacity is detected by 10A discharge and is 48V-17.5AH.
Example 3
1. The available ternary lithium battery pack 14 string (nominal voltage capacity 48V-20 AH) is selected, the actual detection capacity is 11AH, and the nominal battery cell 18650-2000mah is selected.
2. And integrally disassembling the outer package of the battery pack, taking out all the battery cells, and arranging the battery cells in a turnover box, wherein the capacity-dividing detector is connected with a computer for capacity-dividing detection pairing, and the capacity of the battery cells is very close to that of the battery cells.
3. The lithium battery core with good capacity consistency is subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the capacity of the lithium battery core reaches over 1700mah, and the error of 0.1V and the capacity error of 10mah are matched in the same turnover box.
4. In special equipment, under the negative pressure state, a mechanical arm opens a pin hole for a single cell of the battery pack, and a full-automatic liquid adding machine quantitatively adds 2ml for example, 18650-2000mah cells are added, and the mechanical arm is welded with a hole under the negative pressure state. And adding a recovery agent, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring for 60 minutes in a stirring tank, and obtaining the lithium ion battery electrolyte stock solution when sediment is not visible through observation holes of the stirring tank. The lithium ion battery electrolyte stock solution is electrolyte prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (3) assembling the lithium battery cell reaching the detection standard into a finished lithium battery pack by using special assembling equipment.
6. The battery capacity is detected by a special capacity detector, and the actual capacity is detected by 10A discharge and 19.8AH.
Example 4
1. The available ternary lithium battery pack 14 string (nominal voltage capacity 48V-20 AH) is selected, the actual detection capacity is 11AH, and the nominal battery cell 18650-2000mah is selected.
2. And integrally disassembling the outer package of the battery pack, taking out all the battery cells, and arranging the battery cells in a turnover box, wherein the capacity-dividing detector is connected with a computer for capacity-dividing detection pairing, and the capacity of the battery cells is very close to that of the battery cells.
3. The lithium battery core with good capacity consistency is subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the capacity of the lithium battery core reaches over 1700mah, and the error of 0.1V and the capacity error of 10mah are matched in the same turnover box.
4. In special equipment, under the negative pressure state, a mechanical arm opens a pin hole for a single cell of the battery pack, and a full-automatic liquid adding machine quantitatively adds 2ml for example, 18650-2000mah cells are added, and the mechanical arm is welded with a hole under the negative pressure state. And adding a recovery agent, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring for 60 minutes in a stirring tank, and obtaining the lithium ion battery electrolyte stock solution when sediment is not visible through observation holes of the stirring tank. The lithium ion battery electrolyte stock solution is electrolyte prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (3) assembling the lithium battery cell reaching the detection standard into a finished lithium battery pack by using special assembling equipment.
6. The battery capacity is detected by a special capacity detector, and the actual capacity is detected by 10A discharge and is 18.1AH.
Example 5
1. The available ternary lithium battery pack 14 string (nominal voltage capacity 48V-20 AH) is selected, the actual detection capacity is 11AH, and the nominal battery cell 18650-2000mah is selected.
2. And integrally disassembling the outer package of the battery pack, taking out all the battery cells, and arranging the battery cells in a turnover box, wherein the capacity-dividing detector is connected with a computer for capacity-dividing detection pairing, and the capacity of the battery cells is very close to that of the battery cells.
3. The lithium battery core with good capacity consistency is subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the capacity of the lithium battery core reaches over 1700mah, and the error of 0.1V and the capacity error of 10mah are matched in the same turnover box.
4. In special equipment, under the negative pressure state, a mechanical arm opens a pin hole for a single cell of the battery pack, and a full-automatic liquid adding machine quantitatively adds 1.5ml for example, 18650-2000mah cells are added, and the mechanical arm welds a hole under the negative pressure state. And adding a recovery agent, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring for 60 minutes in a stirring tank, and obtaining the lithium ion battery electrolyte stock solution when sediment is not visible through observation holes of the stirring tank. The lithium ion battery electrolyte stock solution is electrolyte prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (3) assembling the lithium battery cell reaching the detection standard into a finished lithium battery pack by using special assembling equipment.
6. The battery capacity is detected by a special capacity detector, and the actual capacity is detected by 10A discharge and 19.3AH.
Example 6
1. The available ternary lithium battery pack 14 string (nominal voltage capacity 48V-20 AH) is selected, the actual detection capacity is 11AH, and the nominal battery cell 18650-2000mah is selected.
2. And integrally disassembling the outer package of the battery pack, taking out all the battery cells, and arranging the battery cells in a turnover box, wherein the capacity-dividing detector is connected with a computer for capacity-dividing detection pairing, and the capacity of the battery cells is very close to that of the battery cells.
3. The lithium battery core with good capacity consistency is subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the capacity of the lithium battery core reaches over 1700mah, and the error of 0.1V and the capacity error of 10mah are matched in the same turnover box.
4. In special equipment, under the negative pressure state, a mechanical arm opens a pin hole for a single cell of the battery pack, and a full-automatic liquid adding machine quantitatively adds 2.5ml for example, 18650-2000mah cells are added, and the mechanical arm welds a hole under the negative pressure state. And adding a recovery agent, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring for 60 minutes in a stirring tank, and obtaining the lithium ion battery electrolyte stock solution when sediment is not visible through observation holes of the stirring tank. The lithium ion battery electrolyte stock solution is electrolyte prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (3) assembling the lithium battery cell reaching the detection standard into a finished lithium battery pack by using special assembling equipment.
6. The battery capacity is detected by a special capacity detector, and the actual capacity is detected by 10A discharge and 19.8AH.
The performance test data of the lithium battery pack obtained after the lithium batteries in the above examples were subjected to test maintenance pairing are shown in the following table.
The foregoing has outlined rather broadly the more detailed description of the application in order that the detailed description of the principles and embodiments of the application may be implemented in conjunction with the detailed description of the application that follows, the examples being merely intended to facilitate an understanding of the method of the application and its core concepts; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
From the description of the embodiments above, it will be apparent to those skilled in the art that the application may be practiced. Of course, the above listed cases are only examples, and the present application is not limited thereto. Those skilled in the art will appreciate that other variations or simplifications of the inventive solution may be suitably employed in the present application and are intended to be included within the scope of the present application.
Claims (6)
1. A preparation method of a lithium battery restoration agent is characterized in that graphene is added into an electrolyte stock solution of a lithium ion battery, and the mixture is fully stirred in a stirring tank for 60 minutes, and a precipitate is not visible by a visual observation hole of the stirring tank, so that the lithium battery restoration agent is obtained.
2. The method for preparing a lithium battery restoration agent according to claim 1, wherein the lithium ion battery electrolyte stock solution is prepared from methylethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
3. The method for preparing a lithium battery restoration agent according to claim 1, wherein the weight ratio of the lithium ion battery electrolyte stock solution to graphene is 1000000:2.
4. a method for repairing and assembling a lithium battery pack using the lithium battery restorative according to any one of claims 1 to 3, comprising the steps of:
selecting available lithium battery packs, and eliminating unqualified battery cells;
opening a pinhole of the selected battery core of the available lithium battery pack in a negative pressure state, and quantitatively adding a lithium battery restorer;
hole repairing is carried out on the battery core of the lithium battery pack in a welding mode under the negative pressure state;
and after the lithium battery cell obtained in the previous step is detected, assembling the lithium battery cell reaching the detection standard into a finished lithium battery.
5. The method for repairing and assembling the lithium battery pack according to claim 4, wherein the method is characterized in that the available lithium battery pack is selected, unqualified battery cells are removed, and the method comprises the steps of firstly charging, discharging and recharging the lithium battery pack through a voltage balancing instrument, and circulating for three times to recover and correct the voltage of each string of battery cells of the lithium battery pack as much as possible; integrally disassembling the outer package of the lithium battery pack, measuring the voltages of all strings, and removing single strings with lower voltages, wherein the ternary battery removes single strings with lower voltages than 3.7V, and the lithium iron removes single strings with lower voltages than 3.2V; dividing a single-string battery cell with low voltage into charging and discharging capacity of each channel by using a lithium capacitance detector, and removing the battery cell with low voltage and capacity again; replacing the removed battery cells with standard voltage and capacity to reconstruct the lithium battery pack.
6. The method for repairing and assembling the lithium battery pack according to claim 4, wherein the available lithium battery pack is selected, unqualified battery cells are removed, the battery pack outer package is disassembled integrally, all the battery cells are taken out, and the battery cells with the approximate capacity are selected to be placed in a turnover box through capacity-division detection pairing by a detector of a matching channel; sorting the lithium battery cores with good capacity consistency by an automatic sorting machine according to voltage and internal resistance, and placing the selected lithium battery cores in a turnover box, wherein the voltage and the internal resistance are close to each other; and assembling the finished lithium battery pack by adopting the detected lithium battery cell.
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