CN111525172A - Assembling method of lithium ion button cell - Google Patents
Assembling method of lithium ion button cell Download PDFInfo
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- CN111525172A CN111525172A CN202010280644.6A CN202010280644A CN111525172A CN 111525172 A CN111525172 A CN 111525172A CN 202010280644 A CN202010280644 A CN 202010280644A CN 111525172 A CN111525172 A CN 111525172A
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- button cell
- lithium
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- assembly
- ion button
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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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- 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
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
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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
- H01M10/05—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
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses an assembling method of a lithium ion button cell, belongs to the technical field of lithium ion batteries, and solves the technical problems that the efficiency of assembling the lithium ion button cell is low and the assembled lithium ion button cell is easy to short circuit in the prior art. The invention ensures that the diaphragm fully covers the positive plate, avoids dislocation and reduces the risk of short circuit on one hand, and utilizes the larger volume space of the positive shell to store electrolyte on the other hand, thereby ensuring that the electrode plates are fully soaked. The button cell is pre-assembled by dividing the button cell into two independent assemblies, and then the assemblies are compounded, so that the process of assembling the button cell is quick and convenient, the short circuit ratio of the prepared button cell is small, and the consistency is good.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to an assembly method of a lithium ion button cell.
Background
Lithium ion button cells are widely used as battery materials due to their small size, low cost, and simple and convenient assembly. The performance of the lithium ion button cell battery has a large relationship with the assembly process, and if the control is not in place, the battery is easy to be short-circuited and fail.
The published literature, "lithium ion button cell assembly, charge and discharge measurement and data analysis, energy storage science and technology, 2018,7 (2)" discloses a method for assembling a button cell, which is to assemble a negative electrode casing | metal lithium sheet | diaphragm | electrolyte | positive electrode sheet | gasket | spring sheet | positive electrode casing in sequence, and at present, whether in enterprises or scientific research institutes, the button cell assembly mode is basically similar to the report in the above literature, or in reverse sequence. However, in the assembly process of the method, the flatness of the metal lithium sheet needs to be treated, additional operation steps are added, meanwhile, the requirement on the level of an operator is high, if electrolyte is dripped into the lithium sheet in advance, the diaphragm and the metal lithium sheet are adhered to each other, the adjustment is not easy, and therefore the diaphragm needs to be placed in place at one time, the assembly efficiency is reduced, and the short circuit risk is increased. In addition, because the volume of the negative electrode shell is small, the electrolyte can be extruded by adding the subsequent pole piece, the gasket, the spring piece and the positive electrode shell, so that the electrolyte overflows to pollute the buckling shell.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problems that the efficiency of assembling the lithium ion button cell is low and the assembled lithium ion button cell is easy to short circuit in the prior art, the invention provides the assembling method of the lithium ion button cell, which can improve the assembling efficiency of the lithium ion battery, reduce the short circuit risk to a great extent and improve the consistency of the button electrical performance.
The invention is realized by the following technical scheme.
An assembling method of a lithium ion button cell sequentially comprises the following steps:
s1, preparation of the lithium ion button cell positive electrode:
s11, placing the positive electrode shell on a plane, and placing the positive electrode sheet in the positive electrode shell in the center to obtain a first assembly;
s12, putting the diaphragm into the first assembly obtained in the step S11 to obtain a second assembly;
s13, adding electrolyte into the assembly II prepared in the step S12, standing for 1-10 minutes, and fully infiltrating the diaphragm with the electrolyte to prepare an assembly III for later use;
s2, preparation of a lithium ion button cell negative electrode:
s21, placing the negative electrode shell on the platform surface;
s22, placing the gasket in the middle of the negative electrode shell to obtain a fourth assembly;
s23, placing the gasket above the gasket in the middle of the assembly IV to obtain an assembly V;
s24, placing the negative plate on the gasket in the fifth combination body to obtain a sixth combination body for later use;
s3, assembling the lithium-ion button cell:
s31, inverting the assembly six prepared in the clamping step S24 into the assembly three prepared in the step S13 to prepare an assembly seven;
and S32, sealing the combined body seven obtained in the step S31 to obtain the lithium ion button cell.
Further, the step S1 of preparing the positive electrode of the lithium-ion button cell is performed independently from the step S2 of preparing the negative electrode of the lithium-ion button cell.
Further, step S2 is performed during the standing of the electrolytic solution in step S13.
Further, the material of the positive plate in step S11 is one or a mixture of several of lithium cobaltate, ternary lithium iron phosphate, lithium-rich manganese, graphite, hard carbon, soft carbon, mesocarbon microbeads, lithium titanate, and capacitor carbon;
further, in the step S12, the material of the diaphragm is one of polyethylene, polypropylene, polyethylene/polypropylene, cellulose, and polymethyl methacrylate,
further, the diaphragm is a base material, and the surface of the diaphragm is coated with ceramic or adhesive.
Further, the electrolyte in step S12 is one or more of Ethylene Carbonate (EC), propylene carbonate, γ -butyrolactone, dimethyl carbonate, diethyl carbonate (DEC), butylene carbonate, ethylmethyl carbonate, and acetonitrile.
Further, the solute in the electrolyte is at least one of sodium perchlorate, sodium hexafluorophosphate, sodium trifluoromethanesulfonate, sodium bis (trifluoromethanesulfonyl) imide, sodium bisoxalate, sodium hexafluoroarsenate, tetraethylene glycol dimethyl ether, tetraethylammonium tetrafluoroborate or spiro quaternary ammonium salt.
Further, in step S24, the negative electrode sheet is made of one or a mixture of several of metal lithium sheet, graphite, soft carbon, hard carbon, mesocarbon microbeads, lithium titanate, and capacitive carbon.
Compared with the prior art, the invention has the beneficial effects that:
firstly, assembling a positive electrode shell, a positive plate, a diaphragm and electrolyte to form a third assembly, then standing, assembling a sixth assembly in the standing process, finally buckling the sixth assembly into the assembly 3 by using tweezers, then packaging, and assembling to form a buckle;
the invention utilizes the advantage of large positive electrode shell to assemble the positive electrode shell, the positive electrode plate, the diaphragm and the electrolyte, on one hand, the diaphragm is ensured to fully cover the positive electrode plate, dislocation is avoided, and the risk of short circuit is reduced, on the other hand, the electrolyte is stored by utilizing larger volume space of the positive electrode shell, and the electrode plate is ensured to be fully soaked. The buckling capacitor is pre-assembled into two independent assemblies, and then the assemblies are combined, so that the difficulty that the assemblies are required to be orderly stacked one by one in the traditional assembling process is avoided, the efficiency is improved, and the dislocation risk is reduced.
Drawings
FIG. 1 is a flowchart showing the process of the present invention.
In the figure, 1 is a positive electrode case, 2 is a positive electrode sheet, 3 is a separator, 4 is an electrolyte, 5 is a negative electrode case, 6 is a gasket, 7 is a gasket, and 8 is a negative electrode sheet.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the examples follow conventional experimental conditions. In addition, it will be apparent to those skilled in the art that various modifications or improvements can be made to the material components and amounts in these embodiments without departing from the spirit and scope of the invention as defined in the appended claims.
Example 1:
punching a ternary NCM622 thin strip into small wafers serving as a positive plate 2 of the cell, wherein the diaphragm 3 is made of an uncoated diaphragm made of polypropylene, the negative plate 8 is made of metal lithium, an electrolyte solvent is EC: DEC =1:1 (volume percentage), an electrolyte is lithium hexafluorophosphate with the concentration of 1mol/L, and assembling the CR2032 button cell according to the following steps as shown in figure 1:
s1, preparation of the lithium ion button cell positive electrode:
s11, placing the positive electrode shell 1 on a plane, and placing the positive electrode sheet 2 in the positive electrode shell 1 in the center to obtain a first assembly;
s12, putting the diaphragm 3 into the first assembly obtained in the step S11 to obtain a second assembly;
s13, adding the electrolyte 4 into the assembly II prepared in the step S12, standing for 1-10 minutes, and fully infiltrating the diaphragm 3 with the electrolyte 4 to prepare an assembly III for later use;
s2, preparation of a lithium ion button cell negative electrode:
s21, placing the negative electrode can 5 on the platform surface;
s22, placing the gasket 6 in the middle of the negative electrode shell 5 to obtain a fourth combined body;
s23, placing the gasket 7 above the gasket 6 in the assembly IV in a centered manner to obtain an assembly V;
s24, placing the negative plate 8 on the gasket 7 in the fifth combination body to obtain a sixth combination body for later use;
s3, assembling the lithium-ion button cell:
s31, inverting the assembly six prepared in the step S24 in the assembly three prepared in the step S13 to prepare an assembly seven;
and S32, sealing the combined body seven obtained in the step S31 to obtain the lithium ion button cell.
The number of the assembled batteries is 5, and then the voltage and specific capacity of the assembled batteries are tested.
Example 2:
punching graphite into small wafers serving as positive plates 2 of the battery, wherein the diaphragm 3 is made of an uncoated polypropylene diaphragm, the negative plate 8 is made of metal lithium, an electrolyte solvent is EC: DEC =1:1 (volume percentage), an electrolyte is lithium hexafluorophosphate with the concentration of 1mol/L, the assembling method of the lithium ion button battery is the same as that described in the embodiment 1, assembling of the CR2032 button battery is carried out, the number of the assembled batteries is 5, and then voltage and specific capacity tests are carried out on the assembled button battery.
Comparative example 1
The three-element NCM622 positive electrode, the diaphragm, the metal lithium sheet and the electrolyte with the same size and composition as the three-element NCM622 positive electrode, the diaphragm, the metal lithium sheet and the electrolyte are sequentially assembled according to the sequence of the negative electrode shell | metal lithium sheet | diaphragm | electrolyte | NCM622 positive electrode sheet | gasket | spring sheet | positive electrode shell, the number of the assembled batteries is 5, and then the voltage and specific capacity test is carried out on the assembled electricity.
Comparative example 2:
the three-element NCM622 positive electrode, the diaphragm, the metal lithium sheet and the electrolyte with the same size and composition as those of the embodiment 1 are sequentially assembled according to the sequence of the positive electrode shell | NCM622 positive electrode sheet | diaphragm | electrolyte | metal lithium sheet | gasket | spring sheet | negative electrode shell, the number of the assembled batteries is 5, and then the voltage and specific capacity test is carried out on the assembled electricity.
Comparative example 3
The graphite positive plate, the diaphragm, the metal lithium plate and the electrolyte which have the same size and composition as those in the embodiment 2 are sequentially assembled according to the sequence of the positive shell | graphite positive plate | diaphragm | electrolyte | metal lithium plate | gasket | spring piece | negative shell, the number of the assembled batteries is 5, and then the voltage and specific capacity test is carried out on the assembled electricity deduction.
Comparative example 4
The graphite positive plate, the diaphragm, the metal lithium plate and the electrolyte which have the same size and composition as those in the embodiment 2 are sequentially assembled according to the sequence of the negative electrode shell | metal lithium plate | diaphragm | electrolyte | graphite positive plate | gasket | spring piece | positive shell, the number of the assembled batteries is 5, and then the voltage and specific capacity test is carried out on the assembled electricity.
Table 1 shows the data of the electricity withholding test of different examples and comparative examples, and it can be seen from the results that the electricity withholding assembled by the method of the present invention has higher voltage, lower short circuit probability and higher specific capacity of the battery.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The assembling method of the lithium ion button cell is characterized by sequentially comprising the following steps of:
s1, preparation of the lithium ion button cell positive electrode:
s11, placing the positive electrode shell (1) on a plane, and placing the positive electrode sheet (2) in the positive electrode shell (1) in the center to obtain a first assembly;
s12, putting the diaphragm (3) into the first assembly obtained in the step S11 to obtain a second assembly;
s13, adding the electrolyte (4) into the assembly II prepared in the step S12, standing for 1-10 minutes, and fully infiltrating the diaphragm (3) with the electrolyte (4) to prepare an assembly III for later use;
s2, preparation of a lithium ion button cell negative electrode:
s21, placing the negative electrode shell (5) on the platform surface;
s22, placing the gasket (6) in the cathode shell (5) in the middle to obtain a fourth combined body;
s23, placing the gasket (7) above the gasket (6) in the fourth assembly in the middle to obtain a fifth assembly;
s24, placing the negative plate (8) on the gasket (7) in the fifth combination body to obtain a sixth combination body for later use;
s3, assembling the lithium-ion button cell:
s31, inverting the assembly six prepared in the clamping step S24 into the assembly three prepared in the step S13 to prepare an assembly seven;
and S32, sealing the combined body seven obtained in the step S31 to obtain the lithium ion button cell.
2. The method for assembling a lithium-ion button cell battery according to claim 1, wherein: the step S1 is performed independently of the step S2.
3. The method for assembling a lithium-ion button cell battery according to claim 1, wherein: step S2 is performed during the standing of the electrolyte in step S13.
4. The method for assembling a lithium-ion button cell battery according to claim 1, wherein: the material of the positive plate (2) in the step S11 is one or a mixture of more of lithium cobaltate, ternary lithium iron phosphate, lithium-rich manganese, graphite, hard carbon, soft carbon, mesocarbon microbeads, lithium titanate and capacitance carbon.
5. The method for assembling a lithium-ion button cell battery according to claim 1, wherein: in the step S12, the material of the diaphragm (3) is one of polyethylene, polypropylene, polyethylene/polypropylene, cellulose, and polymethyl methacrylate.
6. The method for assembling a lithium-ion button cell battery according to claim 5, wherein: the diaphragm (3) is a base material, and the surface of the diaphragm (3) is coated with ceramic or adhesive.
7. The method for assembling a lithium-ion button cell battery according to claim 1, wherein: in the step S12, the electrolyte (4) is one or more of ethylene carbonate, propylene carbonate, gamma-butyrolactone, dimethyl carbonate, diethyl carbonate, butylene carbonate, methyl ethyl carbonate and acetonitrile.
8. The method for assembling a lithium-ion button cell battery according to claim 7, wherein: solute in the electrolyte is at least one of sodium perchlorate, sodium hexafluorophosphate, sodium trifluoromethanesulfonate, sodium bis (trifluoromethanesulfonyl) imide, sodium bisoxalate, sodium hexafluoroarsenate, tetraethylene glycol dimethyl ether, tetraethylammonium tetrafluoroborate or spiro quaternary ammonium salt.
9. The method for assembling a lithium-ion button cell battery according to claim 1, wherein: the material of the negative plate (8) in the step S24 is one or a mixture of several of metal lithium plate, graphite, soft carbon, hard carbon, mesocarbon microbeads, lithium titanate and capacitance carbon thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010280644.6A CN111525172A (en) | 2020-04-10 | 2020-04-10 | Assembling method of lithium ion button cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010280644.6A CN111525172A (en) | 2020-04-10 | 2020-04-10 | Assembling method of lithium ion button cell |
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| CN111525172A true CN111525172A (en) | 2020-08-11 |
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| CN202010280644.6A Pending CN111525172A (en) | 2020-04-10 | 2020-04-10 | Assembling method of lithium ion button cell |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486431A (en) * | 1994-03-02 | 1996-01-23 | Micron Communications, Inc. | Method of producing button-type batteries and spring-biased concave button-type battery |
| US6060194A (en) * | 1996-12-13 | 2000-05-09 | Varta Batterie Aktiengesellschaft | Button cell with retaining ring for anode |
| CN203707230U (en) * | 2014-03-07 | 2014-07-09 | 湖南美特新材料科技有限公司 | Button cell anode and button cell |
-
2020
- 2020-04-10 CN CN202010280644.6A patent/CN111525172A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486431A (en) * | 1994-03-02 | 1996-01-23 | Micron Communications, Inc. | Method of producing button-type batteries and spring-biased concave button-type battery |
| US6060194A (en) * | 1996-12-13 | 2000-05-09 | Varta Batterie Aktiengesellschaft | Button cell with retaining ring for anode |
| CN203707230U (en) * | 2014-03-07 | 2014-07-09 | 湖南美特新材料科技有限公司 | Button cell anode and button cell |
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Application publication date: 20200811 |
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