CN114421024A - Preparation method of small-size electrodeless-ear lithium ion battery - Google Patents
Preparation method of small-size electrodeless-ear lithium ion battery Download PDFInfo
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- CN114421024A CN114421024A CN202111543151.8A CN202111543151A CN114421024A CN 114421024 A CN114421024 A CN 114421024A CN 202111543151 A CN202111543151 A CN 202111543151A CN 114421024 A CN114421024 A CN 114421024A
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- lithium ion
- foil
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- ion battery
- aluminum
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 50
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 50
- 239000011248 coating agent Substances 0.000 claims description 34
- 238000000576 coating method Methods 0.000 claims description 34
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 30
- 239000011888 foil Substances 0.000 claims description 30
- 239000011889 copper foil Substances 0.000 claims description 22
- 238000004804 winding Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000005030 aluminium foil Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000010287 polarization Effects 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
-
- 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
- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
-
- 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
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
-
- 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
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- 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 preparation method of a small-specification non-polar ear lithium ion battery, which is characterized in that the preparation method of a non-polar ear battery cell is applied to the preparation of the small-specification lithium ion battery, so that the internal conductive efficiency of the battery cell can be improved, the physical polarization is reduced, the conductive uniformity of a current collector in the battery cell is improved, the heating is reduced, the problem that the discharge power of the battery cell cannot be matched with the use requirement of a tool in the application of ultra-high power output of the lithium ion battery is solved, and the problems of difficulty and potential safety hazard of a multi-polar ear battery cell in the manufacturing process are solved.
Description
Technical Field
The invention relates to the field of lithium ion battery preparation, in particular to a preparation method of a small-specification electrodeless ear lithium ion battery.
Background
Cordless electric tools are currently applied more and more widely in professional engineering fields at home and abroad, and due to the fact that rechargeable lithium ion batteries are used as power sources, the cordless electric tools are convenient to use, but cannot completely replace wired alternating current tools in many fields needing high-power output. However, in many application scenarios such as outdoor operation and high-altitude operation, the length of the power line is limited, which causes inconvenience. Therefore, in the field of special electric tools requiring high power output, the super-large current discharge performance of the lithium ion battery is particularly important. Although the increase of the number of the lugs in the battery cell can improve the physical conductive efficiency, the lugs in the shell of the multi-lug battery cell are difficult to bend, the manufacture procedure is inconvenient to realize, and the multi-lug easily causes the hidden trouble of short circuit in the battery cell due to poor bending.
At present, most of battery preparation processes without lugs are cylindrical batteries with the diameter of 21mm or more, the cylindrical batteries with the larger diameter are shaped and are easy to be in physical contact with a positive electrode cap end and a negative electrode steel shell end in a larger area, so that the current passing path is increased, the loss is reduced, an additional welding process is not needed, but the battery preparation processes are pure physical contact, and the excessive current passing through the contact position is easy to cause heating, so that the conventional lug-free process is limited to occasions with the discharge rate below 3C, the advantages of the lug-free process are only shown in the type of battery cell and are more uniform in current distribution of the pole piece, and the assembly process is simple.
Therefore, in order to solve the problem of adverse effect caused by the adoption of a multi-tab process of a cylindrical lithium ion battery with the diameter of less than 21mm, the application provides a solution.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a preparation method of a small-specification electrodeless ear lithium ion battery, which can improve the internal conduction efficiency of a battery cell, reduce physical polarization, improve the conduction uniformity of a current collector in the battery cell, reduce heating, solve the problem that the discharge power of the battery cell cannot be matched with the use requirement of a tool in the application of ultra-high power output of the lithium ion battery, and simultaneously avoid the problems of difficult points and potential safety hazards of a multi-lug battery cell in the manufacturing process.
The technical scheme is as follows: the invention relates to a preparation method of a small-size electrodeless ear lithium ion battery, which comprises the following steps:
s1: preparing a slurry material coated on the positive electrode and a slurry material coated on the negative electrode;
s2: reserving a hollow aluminum foil with the width of 2-4mm at the edge of the anode for the anode coating;
s3: reserving 2-4mm width empty copper foil at the edge of the negative electrode coating;
s4: winding the diaphragm and the aluminum foil and the copper foil which finish the coating of the anode and the coating of the cathode, and ensuring that the reserved empty aluminum foil and empty copper foil in S2 and S3 are respectively positioned at two ends of a winding core formed after winding;
s5: after winding, carrying out inner-rolling shaping on the empty aluminum foils of the positive electrode to enable the aluminum foils to be mutually jointed into opposite planes, carrying out inner-rolling shaping on the empty copper foils of the negative electrode to enable the copper foils to be mutually jointed into opposite planes;
s6: welding an aluminum sheet on the plane formed by the positive aluminum foil in S5, and welding a copper sheet on the plane formed by the negative copper foil in S5;
s7: after the roll core is placed into the shell, the shell bottom is connected with the copper sheet of the negative electrode through laser welding, the cover cap is connected with the aluminum sheet of the positive electrode through welding, and the flow guide structure inside the whole battery core is completed.
Preferably, the slot-out coating is used in S2 and S3 to precisely control the coating width and the empty foil width.
Preferably, the width of the negative electrode coating in S2 is not less than the width of the positive electrode coating, so that the negative electrode coating width can completely cover the positive electrode coating width during winding.
Preferably, in S4, the relative positions of the aluminum foil, the copper foil and the diaphragm during the winding process are controlled by a precision laser rectification system, and the offset error is controlled to be ± 0.3 mm.
Preferably, in S6, the aluminum sheet covers three quarters of the end face of the positive aluminum foil after winding, and the thickness of the aluminum sheet is controlled to be 0.15 mm.
Preferably, in S7, an insulating sheet is disposed between the cap and the aluminum sheet of the positive electrode, the insulating sheet completely covers the aluminum foil end face of the positive electrode, covers the aluminum sheet inside, and prevents the aluminum sheet from contacting the steel shell, and the thickness of the insulating sheet is controlled to be 0.2 mm.
Preferably, the insulating sheet is provided with an opening, and a tab is led out from the aluminum sheet in the opening to be connected with the cap.
Has the advantages that: this application is through electrically conductive traditional point, becomes present face electrically conductive, has improved electrically conductive efficiency, has improved the extra high rate discharge performance of electric core greatly, simultaneously because the physics internal resistance reduces, generates heat and reduces, has also improved the cycle life that electric core extra high rate was discharged.
Drawings
FIG. 1 is a schematic diagram of a coating segment and an empty foil segment for a positive coating of the present application;
FIG. 2 is a top view of an aluminum foil in the present application;
FIG. 3 is a top view of an insulating sheet of the present application;
fig. 4 is a schematic diagram of a wound cell in the present application.
Detailed Description
The present application is further illustrated with reference to specific examples below.
In this embodiment, taking a 18650-2000mAh battery as an example, the preparation method comprises the following steps:
s1: preparing a slurry material coated on the positive electrode and a slurry material coated on the negative electrode;
s2: as shown in fig. 1, for the anode coating, the coating width is 56.5 ± 0.2mm, an empty aluminum foil with the width of 2.5 ± 0.2mm is reserved at the edge of the anode, and the coating width and the empty aluminum foil width are accurately controlled by adopting slit forward coating;
s3: by adopting the method in S2, for the negative electrode coating, the coating width is 57.5 +/-0.2 mm, an empty copper foil with the width of 2.5 +/-0.2 mm is reserved at the edge of the negative electrode, the width of the coating and the width of the empty copper foil are accurately controlled by adopting slit registering type coating, the width of the negative electrode coating can completely cover the width of the positive electrode coating, the positive electrode lithium ions can be smoothly transferred to the negative electrode in the charging process, and the internal short circuit of the wound and molded battery cell caused by the precipitation of lithium metal is avoided;
s4: and (3) winding the diaphragm and the aluminum foil and the copper foil which finish the coating of the anode and the coating of the cathode, ensuring that the reserved empty aluminum foil and empty copper foil in the S2 and S3 are respectively positioned at two ends of a winding core formed after winding, and controlling the relative positions of the aluminum foil, the copper foil and the diaphragm in the winding process to be within +/-0.3 mm by a precise laser deviation correction system.
S5: after winding, carrying out inner-rolling shaping on the empty aluminum foils of the positive electrode to enable the aluminum foils to be mutually jointed into opposite planes, carrying out inner-rolling shaping on the empty copper foils of the negative electrode to enable the copper foils to be mutually jointed into opposite planes;
s6: welding an aluminum sheet 1 on the plane formed by the positive aluminum foil in S5, wherein the aluminum sheet 1 covers three quarters of the end face of the positive aluminum foil after winding, as shown in FIG. 1, and the thickness of the aluminum sheet 1 is controlled to be 0.15 mm; welding a copper sheet 2 on the plane formed by the negative copper foil in the S5;
s7: after the winding core is placed into the shell, the shell bottom is connected with the copper sheet 2 of the negative electrode through laser welding; connect the block and anodal aluminium thin slice 1 through the welding, be provided with insulating piece 3 between block and anodal aluminium thin slice 1, as shown in fig. 2, insulating piece 3 covers anodal aluminium foil terminal surface completely, including covering aluminium thin slice 1, prevent that aluminium thin slice 1 and box hat contact from causing the short circuit, 3 thickness control on the insulating piece is 0.2mm, be provided with the opening on the insulating piece 3, it has utmost point ear 4 and block connection to draw forth from aluminium thin slice 1 in the opening, accomplish the inside water conservancy diversion structure of whole electric core, as shown in fig. 4, for coiling electric core structure schematic diagram after accomplishing.
The preparation method of the electrode lug-free battery cell is applied to cylindrical batteries with the diameter of 18mm or below, if the battery cell with the smaller diameter is conducted by purely depending on physical contact between the shaped positive and negative electrode end faces and the cap or the steel shell, the contact area can be obviously smaller than that of the battery cell with the diameter of more than 21mm, and therefore, the contact resistance can be larger. Therefore, the shaped positive and negative end surfaces are welded with the corresponding aluminum sheet (positive end) and copper sheet (negative end), then the aluminum sheet is welded with the cap, and the copper sheet is welded with the negative steel shell, so that the flow guide channel is changed from pure physical contact into welding contact, the flow guide capacity and the contact reliability are greatly improved, and the discharge requirement with the multiplying power of more than 10C can be applied.
According to the traditional multi-lug 18650-enriched 2000mAh battery cell, the internal resistance is about 13m omega, the instantaneous output power of a single battery cell is about 90W, the highest temperature of the surface of the battery cell after 10C continuous discharge is about 80 ℃, and the discharge cycle life of 10C is not less than 300 weeks, the internal resistance of the battery cell with the electrodeless ear structure prepared by the method can be reduced to be below 10m omega, the instantaneous output power of the single battery cell reaches more than 180W, the highest temperature of the surface of the battery cell after 10C continuous discharge is about 65 ℃, and the discharge cycle life of 10C is not less than 600 weeks, and it can be found that in the 18650-enriched 2000mAh battery cell, the internal resistance of the battery cell prepared by the method is reduced by 30%, the instantaneous output power is improved by 100%, the continuous discharge temperature is reduced by 25%, and the cycle life is improved by one time.
Claims (7)
1. A preparation method of a small-size electrodeless ear lithium ion battery is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing a slurry material coated on the positive electrode and a slurry material coated on the negative electrode;
s2: reserving a hollow aluminum foil with the width of 2-4mm at the edge of the anode for the anode coating;
s3: reserving 2-4mm width empty copper foil at the edge of the negative electrode coating;
s4: winding the diaphragm and the aluminum foil and the copper foil which finish the coating of the anode and the coating of the cathode, and ensuring that the reserved empty aluminum foil and empty copper foil in S2 and S3 are respectively positioned at two ends of a winding core formed after winding;
s5: after winding, carrying out inner-rolling shaping on the empty aluminum foils of the positive electrode to enable the aluminum foils to be mutually jointed into opposite planes, carrying out inner-rolling shaping on the empty copper foils of the negative electrode to enable the copper foils to be mutually jointed into opposite planes;
s6: welding an aluminum sheet on the plane formed by the positive aluminum foil in S5, and welding a copper sheet on the plane formed by the negative copper foil in S5;
s7: after the roll core is placed into the shell, the shell bottom is connected with the copper sheet of the negative electrode through laser welding, the cover cap is connected with the aluminum sheet of the positive electrode through welding, and the flow guide structure inside the whole battery core is completed.
2. The method for preparing a small-gauge electrodeless ear lithium ion battery as claimed in claim 1, wherein: the slot-out coating is used in S2 and S3 to precisely control the coating width and the empty foil width.
3. The method for preparing a small-gauge electrodeless ear lithium ion battery as claimed in claim 1, wherein: in S2, the width of the negative electrode coating is not less than the width of the positive electrode coating, so that the width of the negative electrode coating can completely cover the width of the positive electrode coating during winding.
4. The method for preparing a small-gauge electrodeless ear lithium ion battery as claimed in claim 1, wherein: and in the S4, the relative positions of the aluminum foil, the copper foil and the diaphragm in the winding process are controlled by a precise laser deviation rectifying system, and the deviation error is controlled to be +/-0.3 mm.
5. The method for preparing a small-gauge electrodeless ear lithium ion battery as claimed in claim 1, wherein: and in the step S6, the aluminum sheet covers three quarters of the end face of the positive electrode aluminum foil after winding, and the thickness of the aluminum sheet is controlled to be 0.15 mm.
6. The method for preparing a small-gauge electrodeless ear lithium ion battery as claimed in claim 1, wherein: be provided with the insulating piece between the anodal aluminium foil of lid and anodal in S7, the insulating piece covers anodal aluminium foil terminal surface completely, including covering the aluminium foil, prevents aluminium foil and steel casing contact, insulating piece thickness control is at 0.2 mm.
7. The method for preparing a small-gauge electrodeless ear lithium ion battery as claimed in claim 6, wherein: an opening is formed in the insulating sheet, and a tab is led out from the aluminum sheet in the opening and connected with the cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111543151.8A CN114421024A (en) | 2021-12-16 | 2021-12-16 | Preparation method of small-size electrodeless-ear lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111543151.8A CN114421024A (en) | 2021-12-16 | 2021-12-16 | Preparation method of small-size electrodeless-ear lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN114421024A true CN114421024A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111543151.8A Pending CN114421024A (en) | 2021-12-16 | 2021-12-16 | Preparation method of small-size electrodeless-ear lithium ion battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080096098A1 (en) * | 2006-10-19 | 2008-04-24 | Hironori Shirakata | Non-aqueous electrolyte secondary battery |
| CN103035954A (en) * | 2012-12-28 | 2013-04-10 | 常州华科新能源科技有限公司 | Winding lithium ion battery and fabrication method thereof |
| CN104485483A (en) * | 2014-12-16 | 2015-04-01 | 天津神鹿能源有限公司 | Lithium ion power battery |
| CN105552428A (en) * | 2016-01-26 | 2016-05-04 | 中山市众旺德新能源科技有限公司 | Manufacturing method for high-rate lithium ion battery, and high-rate lithium ion battery |
| CN112290168A (en) * | 2020-10-16 | 2021-01-29 | 武汉逸飞激光设备有限公司 | Full-tab lithium battery and preparation method thereof |
-
2021
- 2021-12-16 CN CN202111543151.8A patent/CN114421024A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080096098A1 (en) * | 2006-10-19 | 2008-04-24 | Hironori Shirakata | Non-aqueous electrolyte secondary battery |
| CN103035954A (en) * | 2012-12-28 | 2013-04-10 | 常州华科新能源科技有限公司 | Winding lithium ion battery and fabrication method thereof |
| CN104485483A (en) * | 2014-12-16 | 2015-04-01 | 天津神鹿能源有限公司 | Lithium ion power battery |
| CN105552428A (en) * | 2016-01-26 | 2016-05-04 | 中山市众旺德新能源科技有限公司 | Manufacturing method for high-rate lithium ion battery, and high-rate lithium ion battery |
| CN112290168A (en) * | 2020-10-16 | 2021-01-29 | 武汉逸飞激光设备有限公司 | Full-tab lithium battery and preparation method thereof |
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