CN113054233A - Configuration method of lithium battery recovery agent and lithium battery pack maintenance and matching method - Google Patents
Configuration method of lithium battery recovery agent and lithium battery pack maintenance and matching method Download PDFInfo
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- CN113054233A CN113054233A CN202110272107.1A CN202110272107A CN113054233A CN 113054233 A CN113054233 A CN 113054233A CN 202110272107 A CN202110272107 A CN 202110272107A CN 113054233 A CN113054233 A CN 113054233A
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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
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Abstract
A preparation method of a lithium battery recovery agent comprises the steps of adding graphene into an electrolytic stock solution of a lithium ion battery, fully stirring in a stirring tank for 60 minutes, and observing an observation hole of the stirring tank to obtain the lithium battery recovery agent without visual sediment. A lithium battery pack maintenance and matching method comprises the following steps: selecting an available lithium battery pack and removing unqualified battery cores; opening a pinhole in the selected available lithium battery pack battery cell in a negative pressure state, and quantitatively adding a lithium battery recovery agent; welding and hole repairing are carried out on the lithium battery pack core in a negative pressure state; and after the lithium battery pack electric core obtained in the previous step is detected, assembling the lithium battery pack electric core up to the standard to obtain a finished product lithium battery pack. Make old lithium cell group normal cycle once more use, reduce the lithium cell volume of scrapping on the market, extension lithium cell life cycle is favorable to avoiding dismantling the serious environmental pollution who refines the process after the lithium cell is scrapped.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a configuration method of a lithium battery recovery agent and a maintenance and group matching method of a lithium battery pack adopting the lithium battery recovery agent.
Background
A lithium battery is a type of battery using a nonaqueous electrolyte solution, using 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. In the 70 s of the 20 th century, m.s.whitetingham proposed and began to study lithium ion batteries. Because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. With the development of scientific technology, lithium batteries have become the mainstream.
The cost of lithium cell is higher, and at present because old lithium cell group is difficult to recycle, the lithium cell scrapped volume on the market is more, and the lithium cell is scrapped the back and is disassembled and refine the process and produce serious environmental pollution easily, has caused more social resource waste.
Disclosure of Invention
In view of the above situation, in order to solve the problems in the above technologies, the invention provides a configuration method of a lithium battery recovery agent and a maintenance and matching method of a lithium battery pack, so that an 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 process of disassembling and refining after the lithium batteries are scrapped is avoided.
A preparation method of a lithium battery recovery agent comprises the steps of adding graphene into an electrolytic stock solution of a lithium ion battery, fully stirring in a stirring tank for 60 minutes, and observing an observation hole of the stirring tank to obtain the lithium battery recovery agent without visual sediment.
According to the preparation method of the lithium battery recovery agent, the lithium ion battery electrolyte solution is prepared from ethyl methyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
According to the preparation method of the lithium battery recovery agent, the weight ratio of the lithium battery electrolyte solution to the graphene is 1000000: 2.
a lithium battery pack maintenance and matching method comprises the following steps:
selecting an available lithium battery pack and removing unqualified battery cores;
opening a pinhole in the selected available lithium battery pack battery cell in a negative pressure state, and quantitatively adding a lithium battery recovery agent;
welding and hole repairing are carried out on the lithium battery pack core in a negative pressure state;
and after the lithium battery pack electric core obtained in the previous step is detected, assembling the lithium battery pack electric core up to the standard to obtain a finished product lithium battery pack.
According to the method for maintaining and matching the lithium battery packs, available lithium battery packs are selected, and unqualified battery cells are removed, wherein the method comprises the steps of firstly charging, discharging and recharging the lithium battery packs through a voltage balancing instrument, and circulating for three times to recover and correct the voltage of each battery cell of each series of the lithium battery packs as much as possible; integrally disassembling the lithium battery pack outer package, measuring the voltage of each string, and rejecting single strings with low voltage, wherein the ternary battery rejects single strings with voltage lower than 3.7V, and the lithium iron rejects single strings with voltage lower than 3.2V; dividing the single-string battery cells with low voltage into charging and discharging measurement capacities of all channels by using a lithium battery capacity detector, and rejecting the battery cells with low voltage and low capacity again; and replacing the rejected battery cores with the voltage and the capacity up to the standard to form the lithium battery pack again. The method judges the use degree of the interior of the battery according to the detection data, eliminates the completely damaged battery cell of the battery pack to select the available lithium battery pack, is quick and convenient, and is suitable for the battery pack with the excessively high use environment requirement.
According to the lithium battery pack maintenance and matching method, available lithium battery packs are selected, unqualified battery cells are removed, the external package of the battery packs is integrally disassembled, all the battery cells are taken out, capacity grading detection and matching are carried out through a detector of a matching channel, and the battery cells with the approximate capacity are selected and placed in a turnover box; the lithium battery cores with good capacity consistency are subjected to voltage and internal resistance sorting through an automatic sorting machine, and the lithium battery cores with the voltage and the internal resistance close to each other are selected and placed in a turnover box; and assembling the finished lithium battery pack by adopting the lithium battery cell selected by the detection. The method judges the internal use degree of the battery according to the detection data, strictly detects, re-pairs, rejects the electric core with unmatched capacity and voltage to select the available lithium battery pack, has strict detection 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. The method is particularly suitable for the lithium battery pack with high requirement on the using cycle number.
After the technology provided by the invention is adopted, the configuration method of the lithium battery recovery agent and the lithium battery pack maintenance and matching method provided by the embodiment of the invention have the following beneficial effects:
the electrolyte filled between the positive and negative electrodes needs to have good conductivity to minimize the internal resistance of the battery, in addition to being stable. Based on the configuration method of the lithium battery recovery agent and the maintenance and configuration method of the lithium battery pack, the graphene is added into the lithium ion battery electrolytic stock solution, so that the capacity of the lithium ion battery for maintaining stable capacity after large-current charging and discharging and multiple times of charging and discharging is enhanced by the graphene, and the capacity reduction of the battery after multiple times of charging and discharging cycles is reduced.
According to the configuration method of the lithium battery recovery agent and the maintenance and matching method of the lithium battery pack, unqualified battery cells are removed through complete and thorough detection, the recovery agent is added again according to the voltage, internal resistance and capacity matching of the battery cells and the specific negative pressure, the finished lithium battery pack is reassembled, the capacity of the battery pack is obviously recovered, and the number of times of charge and discharge in recycling is increased. The internal resistance is reduced by more than 30% through detection of a special detector, the electric quantity of the power lithium battery is slowly reduced in the processes of starting and climbing of the vehicle, the power is obviously improved, and the distance is doubled compared with that of a battery pack before detection, pairing and recovery. The service life is prolonged by more than one time, and the charge-discharge cycle charge-discharge frequency of the battery pack which reaches the standard after repair reaches about 800-1000 times. Realize the normal recycle once more of old lithium cell group, reduce the lithium cell volume of scrapping on the market, extension lithium cell life cycle has reduced the serious environmental pollution who refines the process of disassembling after the lithium cell is scrapped.
Detailed Description
Various preferred embodiments of the present invention will be described below. The following description is provided to facilitate understanding of example embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist understanding, but they are to be construed as merely illustrative. Accordingly, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Also, in order to make the description clearer and simpler, a detailed description of functions and configurations well known in the art will be omitted.
Example 1
1. The available ternary lithium battery pack 14 string (the nominal voltage capacity is 48V-20AH) is selected, the actual detection capacity is 11AH, and the cell is selected according to the nominal 18650 and 2000 mah.
2. The voltage balance instrument special for the lithium battery is charged, discharged and recharged, and the cycle is carried out for three times, so that the voltage of each series of electric cores of the lithium battery pack is recovered and corrected as much as possible, and the full-charge integral voltage is 56V.
3. The external package of the battery pack is disassembled integrally, the universal meter measures the voltage of each string, each string of the ternary batteries cannot be lower than 3.7V, and single strings with obviously lower voltage are rejected.
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 the lithium battery capacity, and rejecting the battery cells with obviously low voltage and capacity and an obvious slope of a discharge curve.
5. And replacing the battery cell with a battery cell with qualified voltage and capacity, and reconstructing the battery pack.
6. The capacity of the battery pack is detected by a lithium battery capacity detector, and the actual capacity is detected by 10A discharging at 48V-15 AH.
Example 2
1. The available ternary lithium battery pack 14 string (the nominal voltage capacity is 48V-20AH) is selected, the actual detection capacity is 11AH, and the cell is selected according to the nominal 18650 and 2000 mah.
2. The battery pack outer package is disassembled integrally, all the electric cores are taken out, the capacity grading detectors of the special matching channels are used for matching capacity grading detection, the matching channels are connected with a computer, and the matching channels are arranged in the turnover box very close to the capacity displayed by the computer.
3. The lithium battery cores with good capacity consistency are subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the voltage is 3.7V-3.9V, the capacity reaches over 1700mah, and the error of 0.1V and the capacity error of 10mah are matched in the same turnover box.
3. And assembling the finished lithium battery pack by using the special equipment for the lithium battery cell which is up to the standard in detection.
4. The capacity of the battery pack is detected by a lithium battery capacity detector, and the actual capacity is detected by 10A discharging to be 48V-17.5 AH.
Example 3
1. The available ternary lithium battery pack 14 string (the nominal voltage capacity is 48V-20AH) is selected, the actual detection capacity is 11AH, and the cell is selected according to the nominal 18650 and 2000 mah.
2. The battery pack outer package is disassembled integrally, all the electric cores are taken out, the capacity grading detector of the special matching channel is connected with a computer for capacity grading detection pairing, and the capacity is very close to that of the battery pack outer package and is arranged in the turnover box.
3. The lithium battery cores with good capacity consistency are subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the voltage is 3.7V-3.9V, the capacity 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 forms a pinhole on a single battery cell of the battery pack, a full-automatic liquid adding machine quantitatively adds liquid, such as adding 2ml to 18650 and 2000mah battery cells, and the mechanical arm welds and fills the hole under the negative pressure state. And adding a recovery agent into the solution quantitatively, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring the mixture in a stirring tank for 60 minutes, and obtaining the product when no precipitate is observed by visual inspection of an observation hole of the stirring tank. The lithium ion battery electrolyte solution is an electrolyte solution prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (4) assembling the lithium battery pack finished product by using the special assembling equipment for the lithium battery cell which is up to the standard in detection.
6. The battery pack capacity is detected by a special capacity detector, and the actual capacity is detected to be 19.8AH by 10A discharge.
Example 4
1. The available ternary lithium battery pack 14 string (the nominal voltage capacity is 48V-20AH) is selected, the actual detection capacity is 11AH, and the cell is selected according to the nominal 18650 and 2000 mah.
2. The battery pack outer package is disassembled integrally, all the electric cores are taken out, the capacity grading detector of the special matching channel is connected with a computer for capacity grading detection pairing, and the capacity is very close to that of the battery pack outer package and is arranged in the turnover box.
3. The lithium battery cores with good capacity consistency are subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the voltage is 3.7V-3.9V, the capacity 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 forms a pinhole on a single battery cell of the battery pack, a full-automatic liquid adding machine quantitatively adds liquid, such as adding 2ml to 18650 and 2000mah battery cells, and the mechanical arm welds and fills the hole under the negative pressure state. And adding a recovery agent into the solution quantitatively, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring the mixture in a stirring tank for 60 minutes, and obtaining the product when no precipitate is observed by visual inspection of an observation hole of the stirring tank. The lithium ion battery electrolyte solution is an electrolyte solution prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (4) assembling the lithium battery pack finished product by using the special assembling equipment for the lithium battery cell which is up to the standard in detection.
6. The capacity of the battery pack is detected by a special capacity detector, and the actual capacity is detected to be 18.1AH by 10A discharge.
Example 5
1. The available ternary lithium battery pack 14 string (the nominal voltage capacity is 48V-20AH) is selected, the actual detection capacity is 11AH, and the cell is selected according to the nominal 18650 and 2000 mah.
2. The battery pack outer package is disassembled integrally, all the electric cores are taken out, the capacity grading detector of the special matching channel is connected with a computer for capacity grading detection pairing, and the capacity is very close to that of the battery pack outer package and is arranged in the turnover box.
3. The lithium battery cores with good capacity consistency are subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the voltage is 3.7V-3.9V, the capacity 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 forms a pinhole on a single battery cell of the battery pack, a full-automatic liquid adding machine quantitatively adds liquid, such as adding 1.5ml to 18650 and 2000mah battery cells, and the mechanical arm welds and mends the hole under the negative pressure state. And adding a recovery agent into the solution quantitatively, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring the mixture in a stirring tank for 60 minutes, and obtaining the product when no precipitate is observed by visual inspection of an observation hole of the stirring tank. The lithium ion battery electrolyte solution is an electrolyte solution prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (4) assembling the lithium battery pack finished product by using the special assembling equipment for the lithium battery cell which is up to the standard in detection.
6. The battery pack capacity is detected by a special capacity detector, and the actual capacity is detected to be 19.3AH by 10A discharge.
Example 6
1. The available ternary lithium battery pack 14 string (the nominal voltage capacity is 48V-20AH) is selected, the actual detection capacity is 11AH, and the cell is selected according to the nominal 18650 and 2000 mah.
2. The battery pack outer package is disassembled integrally, all the electric cores are taken out, the capacity grading detector of the special matching channel is connected with a computer for capacity grading detection pairing, and the capacity is very close to that of the battery pack outer package and is arranged in the turnover box.
3. The lithium battery cores with good capacity consistency are subjected to voltage and internal resistance sorting by using a voltage and internal resistance automatic sorting machine, the voltage is 3.7V-3.9V, the capacity 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 forms a pinhole on a single battery cell of the battery pack, a full-automatic liquid adding machine quantitatively adds liquid, such as adding 2.5ml to 18650 and 2000mah battery cells, and the mechanical arm welds and mends the hole under the negative pressure state. And adding a recovery agent into the solution quantitatively, namely adding 2 g of graphene into 1 kg of lithium ion battery electrolyte stock solution, fully stirring the mixture in a stirring tank for 60 minutes, and obtaining the product when no precipitate is observed by visual inspection of an observation hole of the stirring tank. The lithium ion battery electrolyte solution is an electrolyte solution prepared from methyl ethyl carbonate, lithium hexafluorophosphate, vinylene carbonate and vinyl sulfate.
5. And (4) assembling the lithium battery pack finished product by using the special assembling equipment for the lithium battery cell which is up to the standard in detection.
6. The battery pack capacity is detected by a special capacity detector, and the actual capacity is detected to be 19.8AH by 10A discharge.
The performance test data of the lithium battery pack obtained after the lithium batteries in the embodiment are subjected to detection, maintenance and pairing are shown in the following table.
The present invention has been described in detail, and the principle and embodiments of the present invention are explained herein by using specific examples, which are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
From the above description of the embodiments, it will be apparent to those skilled in the art that the present invention may be practiced. Of course, the above listed cases are only examples, and the present invention is not limited thereto. It should be understood by those skilled in the art that other modifications or simplifications according to the technical solution of the present invention may be appropriately applied to the present invention and should be included in the scope of the present invention.
Claims (6)
1. A preparation method of a lithium battery recovery agent is characterized by adding graphene into an electrolytic stock solution of a lithium ion battery, fully stirring the graphene in a stirring tank for 60 minutes, and observing an observation hole of the stirring tank to obtain the lithium battery recovery agent without visual sediment.
2. The method of claim 1, wherein the lithium ion battery electrolyte solution is prepared from ethyl methyl carbonate, lithium hexafluorophosphate, vinylene carbonate, and vinyl sulfate.
3. The method for preparing a lithium battery recovery agent according to claim 1, wherein the weight ratio of the lithium ion battery electrolyte solution to the graphene is 1000000: 2.
4. a lithium battery pack repairing and grouping method using the lithium battery cell recovery agent according to any one of claims 1 to 3, comprising the steps of:
selecting an available lithium battery pack and removing unqualified battery cores;
opening a pinhole in the selected available lithium battery pack battery cell in a negative pressure state, and quantitatively adding a lithium battery recovery agent;
welding and hole repairing are carried out on the lithium battery pack core in a negative pressure state;
and after the lithium battery pack electric core obtained in the previous step is detected, assembling the lithium battery pack electric core up to the standard to obtain a finished product lithium battery pack.
5. The method for repairing and matching lithium battery packs as claimed in claim 4, wherein the available lithium battery packs are selected and the unqualified cells are removed, wherein the lithium battery packs are firstly charged, discharged and recharged through the voltage balancing instrument, and the cycle is performed for three times, so that the voltage of each cell of each lithium battery pack is recovered and corrected as much as possible; integrally disassembling the lithium battery pack outer package, measuring the voltage of each string, and rejecting single strings with low voltage, wherein the ternary battery rejects single strings with voltage lower than 3.7V, and the lithium iron rejects single strings with voltage lower than 3.2V; dividing the single-string battery cells with low voltage into charging and discharging measurement capacities of all channels by using a lithium battery capacity detector, and rejecting the battery cells with low voltage and low capacity again; and replacing the rejected battery cores with the voltage and the capacity up to the standard to form the lithium battery pack again.
6. The lithium battery pack maintenance and matching method according to claim 4, wherein available lithium battery packs are selected, unqualified battery cells are removed, the external package of the battery packs is integrally disassembled, all the battery cells are taken out, capacity grading detection and matching are carried out through a detector of a matching channel, and battery cells with approximate capacity are selected and placed in a turnover box; the lithium battery cores with good capacity consistency are subjected to voltage and internal resistance sorting through an automatic sorting machine, and the lithium battery cores with the voltage and the internal resistance close to each other are selected and placed in a turnover box; and assembling the finished lithium battery pack by adopting the lithium battery cell selected by the detection.
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