CN115548536A - Battery core of full-lug cylindrical battery and manufacturing method - Google Patents

Battery core of full-lug cylindrical battery and manufacturing method Download PDF

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Publication number
CN115548536A
CN115548536A CN202211224491.9A CN202211224491A CN115548536A CN 115548536 A CN115548536 A CN 115548536A CN 202211224491 A CN202211224491 A CN 202211224491A CN 115548536 A CN115548536 A CN 115548536A
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CN
China
Prior art keywords
current collector
diaphragm
negative
battery
full
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Pending
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CN202211224491.9A
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Chinese (zh)
Inventor
潘青海
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Tianjin Yingbo Technology Consulting Service Co ltd
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Tianjin Yingbo Technology Consulting Service Co ltd
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Priority to CN202211224491.9A priority Critical patent/CN115548536A/en
Publication of CN115548536A publication Critical patent/CN115548536A/en
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a battery core of a full-lug cylindrical battery and a manufacturing method thereof, and the battery core comprises a negative common lug, a diaphragm, a negative current collector, a negative active material, a positive current collector, a positive active material and a positive common lug, wherein the negative common lug is arranged on one side of the diaphragm, the side end of the diaphragm is communicated with the negative current collector, the negative active material is arranged on the side end of the negative current collector, the positive common lug is symmetrically and reversely arranged on the other side of the negative common lug, the side end of the positive common lug is provided with another diaphragm, the side end of the diaphragm is provided with the positive active material, and the side end of the positive active material is provided with the positive current collector. The invention relates to a battery core of a full-lug cylindrical battery and a manufacturing method thereof, which can still keep a channel for electrolyte permeation after the battery core is leveled, thereby greatly improving the production efficiency and reducing the potential safety quality hazard.

Description

Battery core of full-lug cylindrical battery and manufacturing method
Technical Field
The invention relates to the technical field of battery equipment, in particular to a battery core of a full-lug cylindrical battery and a manufacturing method thereof.
Background
The lithium ion battery has the advantages of high specific energy, long cycle times and the like, is applied to various fields including portable electronic equipment, electric automobiles, electric bicycles, electric tools, energy storage and the like, has higher and higher requirements on the battery along with the rapid increase of the demand of the current market on the battery, and particularly has the advantages of rapid charging and rapid discharging (namely, large-current charging and discharging of the battery) and safety guarantee on the battery.
In the production technology of the cylindrical lithium ion battery, the injection of the electrolyte is a necessary process, and the injection speed is the longest step in the whole battery cell assembly process and directly influences the production efficiency of the whole assembly line; meanwhile, the electrolyte has poor permeation, the performance of the battery is also influenced, and especially potential safety hazards are caused.
In the liquid injection process in the battery assembling step, electrolyte is added around the battery core, and the electrolyte is made to permeate into the battery core under certain positive pressure and negative pressure conditions. In the cell process of non-full tab. Due to the existence of the diaphragm, the electrolyte can permeate into the electrolyte through the channels at the two ends of the battery core. The electrolyte is permeated from two ends, the distance of the channel is shortest, and the efficiency is highest. Can penetrate through the central hole and the periphery;
however, in order to use the current collector as a tab and perform laser welding, the current collector exposed in the current cell of the full tab is flattened or flattened, so that the current collector blocks the permeation channels of the separators at the two ends, the electrolyte can only permeate in the winding direction, and the length of the pole piece for a cylindrical battery is much more than one meter and a large cylinder, like a 4680-shaped battery, the length of the pole piece can be more than four meters. Under this kind of long pole piece structure, can be very long time through the direction infiltration of coiling, at present, along with the diameter of cylindrical battery constantly increases, the scheme of full utmost point ear has obtained the continuous recognition of trade. In the scheme of full utmost point ear, all can carry out the flattening with the electric core of coiling, the flattening is handled and can be to rub different methods such as flat or flatten, but in these schemes, all can be with the partial compaction of electric core both ends metal forming, when annotating liquid in follow-up electrolyte, originally can permeate the passageway at center with electrolyte through the both ends of electric core, stopped up after the flattening, produced the infiltration problem of annotating the liquid stage, prolonged the process time of annotating the liquid, make production efficiency reduce by a wide margin, more problems can be produced to the quality and the safety of battery itself.
Disclosure of Invention
The invention aims to provide a battery core of a full-lug cylindrical battery and a manufacturing method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an electric core and preparation method of full utmost point ear cylindrical battery, includes the ordinary utmost point ear of negative pole, diaphragm, negative current collector, negative active material, the anodal mass flow body, anodal active material and the ordinary utmost point ear of positive pole, the ordinary utmost point ear of negative pole is established in diaphragmatic one side, diaphragmatic side intercommunication has the negative current collector, the side of negative current collector is equipped with negative active material, the opposite side at the ordinary utmost point ear of negative pole is established to the ordinary utmost point ear of anodal symmetry reversal, the side of the ordinary utmost point ear of positive pole is equipped with another diaphragm, the side of diaphragm is equipped with anodal active material, the side of anodal active material is equipped with the anodal mass flow body.
Preferably, the separator has a porous structure.
Preferably, the negative electrode current collector and the positive electrode current collector are made of conductive materials.
Preferably, the membrane is a polymeric material.
Preferably, the height difference between the diaphragm and the negative current collector is 0-2mm, and the height difference of current collectors made of different materials is different and is determined according to the requirements of cell welding and electrolyte seepage.
Preferably, the integral cell is formed by winding.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by utilizing the characteristics of the porous polymer diaphragm in the cell winding process, even if the full-lug cell is kneaded or flattened, microscopic channels are still reserved, and when the battery is filled with electrolyte, the electrolyte is rapidly distributed to the whole pole piece by utilizing the microscopic channels.
2. The invention can ensure that the electrolyte can be more quickly and uniformly distributed on each part of the pole piece by changing the structure of the battery cell under the completely existing process equipment, thereby ensuring the quality of products and improving the qualification rate.
3. The invention shortens the penetration time of the electrolyte injection of the battery core; because the liquid injection is the slowest step of the whole cylindrical electric core assembly line, the efficiency of the whole assembly line is greatly improved, the design of the production line is easier, and the manufacturing cost of the production line is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a general standard non-full tab cell in the prior art;
fig. 2 is a schematic structural diagram of a general standard full tab before cell flattening in the prior art;
fig. 3 is a structural schematic diagram of a general standard cell after being flattened in the prior art;
FIG. 4 is a schematic view of the invention before flattening;
FIG. 5 is a schematic view of the flattened structure of the present invention;
FIG. 6 is test data of the present invention injected with 10ml of electrolyte;
FIG. 7 shows experimental data of the present invention injected with 30ml of electrolyte.
In the figure: 100-negative pole common lug, 101-diaphragm, 102-negative pole current collector, 103-negative pole active material, 104-positive pole current collector, 105-positive pole active material and 200-positive pole common lug.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: a battery core of a full-lug cylindrical battery and a manufacturing method thereof are disclosed, the battery core comprises a negative common lug 100, a diaphragm 101, a negative current collector 102, a negative active material 103, a positive current collector 104, a positive active material 105 and a positive common lug 200, wherein the negative common lug 100 is arranged on one side of the diaphragm 101, the side end of the diaphragm 101 is communicated with the negative current collector 102, the negative active material 103 is arranged on the side end of the negative current collector 102, the positive common lug 200 is symmetrically and reversely arranged on the other side of the negative common lug 100, the side end of the positive common lug 200 is provided with the other diaphragm 101, the positive active material 105 is arranged on the side end of the diaphragm 101, and the positive current collector 104 is arranged on the side end of the positive active material 105.
The cell process can be a cell formed by winding active materials of a lithium ion battery or a sodium ion battery and the like; the battery core can be round or other shapes; the positive electrode current collector 104 and the negative electrode current collector 102 may be foils of metals such as copper foil and aluminum foil, or may be mesh-shaped conductive materials with certain gaps; the membrane 101 may be a single polymer material or a plurality of polymer materials or a membrane with a composite structure of these and other materials; the height difference between the diaphragm 101 and the current collector is 0-2mm, and the height difference can be different according to current collectors made of different materials and is determined according to the requirements of cell welding and electrolyte seepage; the structure of the separator 101 may be at both ends of the anode and cathode; this configuration may be used at either end only, either the negative or positive ends.
In the battery cell with the structure shown in fig. 1, the electrolyte can permeate into each part through the upper end and the lower end.
In the structure shown in fig. 3, the exposed current collector is compacted at the two ends of the upper wire for the subsequent welding process, and the electrolyte can not permeate into each part of the pole piece through the upper end and the lower end any more, so that the electrolyte can permeate into each part, and a long time is needed. If the permeation is not uniform, serious problems can be caused to the quality of the battery, the service life of the battery can be greatly influenced if the permeation is not uniform, and the battery is seriously overheated inside the battery, thermal runaway can be caused, and safety problems can be caused;
fig. 5 the structure of the invention breaks the method of fig. 3, which for all tabs must be pressed together, we will entrain a portion of the separator between the current collectors, thus leaving some channels for electrolyte to penetrate after the cell is flattened or flattened. The height of the entrained separator may vary from current collector to current collector. According to experience, under the condition of ensuring subsequent laser welding, a difference of 0-1mm can be reserved between the diaphragm and the current collector of the copper material, and the height of the current collector of the copper material and the height of the diaphragm can be aligned. The aluminum foil is 0-2mm, and the diaphragm is shorter than the aluminum current collector.
Example one
The invention provides a method for preparing a lithium battery by selecting a ternary cathode material 622, an artificial graphite cathode and LiPF according to a common lithium battery process 6 The electrolyte is DMC/EMDC/EC/VC/FEC, and PVDF is used as a binder. According to the manufacturing method of a general cylindrical battery cell shown in fig. 1, 5 battery cells are manufactured according to the method shown in fig. 1, and the symbols are A1, A2, A3, A4, and A5; fig. 2 shows a general method for manufacturing a cylindrical battery cell with full tabs, wherein 5 battery cells are manufactured according to the method shown in fig. 2, and the two ends of each battery cell are flattened by 3mm, which are marked as B1, B2, B3, B4, and B5; according to the method shown in fig. 4, 5 cells are manufactured according to the method shown in fig. 4, and the height of the negative-electrode-end diaphragm is flush with the current collector of the negative-electrode copper foil; the height of the positive electrode end diaphragm is 1mm less than that of the current collector of the positive electrode aluminum foil, and the two ends of the positive electrode end diaphragm are flattened by 3mm respectively according to a graph 5, and the marks are C1, C2, C3, C4 and C5;
and (3) putting the well-made battery cell into a 4680 steel shell with the height of 89mm and a liquid injection port with the diameter of 2mm reserved in the center of the bottom, performing stick groove and sealing, performing laser welding on the flattened part of the bottom shell and the negative electrode, kneading the flattened positive electrode part, and performing laser welding on the bottom shell and the top cover of the battery. Between the anodal mass flow body and the battery cover to and between negative pole mass flow body and the battery case, can have the dish of collecting current or not collect the dish, this sample does not have the dish of collecting current, directly welds with laser welding.
Taking two batteries in each group, taking 10ml of the same electrolyte on each battery core by a medical injection needle, and injecting the electrolyte through an injection hole; the time for each sample electrolyte to completely enter the cell interior was calculated.
The test data are shown in table 1;
from the results of the above modification experiments: when electrolyte is injected into the battery core, the permeation speed of the electrolyte is close to that of a general non-full-lug battery core, and is far greater than that of the general full-lug structure.
Example two
Taking 2 batteries of the first embodiment respectively, injecting 30ml of the batteries into an automatic liquid injection machine, vacuumizing, and then performing pressurization for 10 times; after the end, weighing the amount of the electrolyte injected into the battery cell by the battery cell, and recording data;
the test data are shown in table 2; from the above table experimental results: when electrolyte is injected into the battery core, the permeation speed of the electrolyte is close to that of a general non-full-lug battery core, and is far greater than that of the general full-lug structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides an electric core of cylindrical battery of full utmost point ear, includes ordinary utmost point ear of negative pole (100), diaphragm (101), the negative pole current collector (102), negative pole active material (103), the anodal current collector (104), anodal active material (105) and the ordinary utmost point ear of anodal (200), its characterized in that: establish the one side at diaphragm (101) in ordinary utmost point ear of negative pole (100), the side intercommunication of diaphragm (101) has the negative current collector (102), the side of the negative current collector (102) is equipped with negative pole active material (103), the opposite side at the ordinary utmost point ear of negative pole (100) is established in the ordinary utmost point ear of positive pole (200) symmetry reversal, the side of the ordinary utmost point ear of positive pole (200) is equipped with another diaphragm (101), the side of diaphragm (101) is equipped with anodal active material (105), the side of anodal active material (105) is equipped with the anodal current collector (104).
2. The electric core of the full-lug cylindrical battery of claim 1, characterized in that: the separator (101) is of a porous structure.
3. The electric core of the full-lug cylindrical battery of claim 2, characterized in that: the negative electrode current collector (102) and the positive electrode current collector (104) are made of conductive materials.
4. The electric core of the full-lug cylindrical battery of claim 3, characterized in that: the diaphragm (101) is a polymeric material.
5. The method for manufacturing a full-tab cylindrical battery as claimed in claim 4, wherein: the height difference between the diaphragm (101) and the negative current collector (102) is 0-2mm, and the height difference of current collectors made of different materials is different and is determined according to the requirements of electric core welding and electrolyte seepage.
6. The method for manufacturing the battery cell of the full-tab cylindrical battery as claimed in claim 5, wherein: the whole battery core is formed by winding.
CN202211224491.9A 2022-09-30 2022-09-30 Battery core of full-lug cylindrical battery and manufacturing method Pending CN115548536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211224491.9A CN115548536A (en) 2022-09-30 2022-09-30 Battery core of full-lug cylindrical battery and manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211224491.9A CN115548536A (en) 2022-09-30 2022-09-30 Battery core of full-lug cylindrical battery and manufacturing method

Publications (1)

Publication Number Publication Date
CN115548536A true CN115548536A (en) 2022-12-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211224491.9A Pending CN115548536A (en) 2022-09-30 2022-09-30 Battery core of full-lug cylindrical battery and manufacturing method

Country Status (1)

Country Link
CN (1) CN115548536A (en)

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