CN112510212A - Stress-free end face shaping battery and manufacturing process thereof - Google Patents
Stress-free end face shaping battery and manufacturing process thereof Download PDFInfo
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- CN112510212A CN112510212A CN202011171282.3A CN202011171282A CN112510212A CN 112510212 A CN112510212 A CN 112510212A CN 202011171282 A CN202011171282 A CN 202011171282A CN 112510212 A CN112510212 A CN 112510212A
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- copper foil
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- 238000007493 shaping process Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000011889 copper foil Substances 0.000 claims abstract description 28
- 239000011888 foil Substances 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 19
- 239000013543 active substance Substances 0.000 claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 239000002002 slurry Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000006255 coating slurry Substances 0.000 abstract description 2
- 239000007773 negative electrode material Substances 0.000 abstract description 2
- 239000007774 positive electrode material Substances 0.000 abstract description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/72—Grids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/70—Current collectors characterised by their structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
-
- 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
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a non-stress end face shaping battery and a manufacturing process thereof, belonging to the technical field of chemical power supplies and characterized by comprising the following steps: firstly, respectively coating slurry containing a positive active material and a negative active material on an aluminum foil and a copper foil current collector, and reserving uncoated areas with certain widths at the edges of two sides of the aluminum foil and the copper foil current collector; secondly, cutting the current collectors of the aluminum foil and the copper foil coated with the active substances into required widths; cutting a plurality of openings for releasing stress in the uncoated areas reserved for the aluminum foil and the copper foil current collectors; fourthly, winding the positive and negative pole pieces after the stress is released and the diaphragm into a battery cell; fifthly, leveling the end faces of the positive electrode and the negative electrode of the battery; welding the welding disc with the shaped positive and negative electrode end faces, or welding the positive and negative electrode connecting sheets with the shaped positive and negative electrode end faces, and simultaneously welding the positive and negative electrode connecting sheets with the positive and negative electrode terminals; and seventhly, assembling the welded battery core and parts, and then injecting liquid and forming.
Description
Technical Field
The invention belongs to the technical field of chemical power supplies, and particularly relates to a stress-free end face shaping battery and a manufacturing process thereof.
Background
As is well known, lithium ion batteries have the advantages of long cycle life, no memory effect and good rate capability, and thus are widely applied to the fields of consumer electronics and power batteries. The conventional lithium ion battery generally comprises a positive pole piece, a negative pole piece, a diaphragm, a current collecting lug and the like, wherein the lug is generally welded on the pole piece in an ultrasonic welding mode, so the current collecting lug often becomes a limitation link of the current collecting capacity of the battery, and can generate large heat during heavy current discharge, thereby influencing the power performance capacity of the battery. The end face shaping design can effectively improve the current collecting capacity of the battery core, but the deformation of current collectors such as copper foils and aluminum foils is large in the end face shaping process, metal chips are easily generated, the self-discharge abnormality of the battery is caused, and even potential safety hazards occur.
Disclosure of Invention
The invention provides a non-stress end face shaping battery and a manufacturing process thereof for solving the technical problems in the prior art, wherein the deformation of a current collector is reduced and the generation of scraps is reduced in the end face shaping process through a stress pre-release design, so that the problem of abnormal self-discharge of the end face shaping battery is reduced.
The first purpose of the invention is to provide a manufacturing process of a cylindrical lithium ion battery with quick charging performance, which comprises the following steps:
s1, respectively coating the slurry containing the positive electrode active substance and the negative electrode active substance on an aluminum foil current collector and a copper foil current collector, and reserving uncoated areas with certain widths at the edges of two sides of the aluminum foil current collector and the copper foil current collector;
s2, cutting the aluminum foil and the copper foil current collector coated with the active substances into required widths;
s3, cutting a plurality of notches with certain width for releasing stress in the reserved uncoated areas of the aluminum foil and the copper foil;
s4, winding the positive and negative pole pieces and the diaphragm after stress release into a battery cell;
s5, flattening the end faces of the positive electrode and the negative electrode of the battery;
s6, welding the welding disc with the shaped positive and negative electrode end faces, or welding the positive and negative electrode connecting sheets with the shaped positive and negative electrode end faces, and simultaneously welding the positive and negative electrode connecting sheets with the positive and negative electrode terminals;
and S7, assembling the welded battery cell and the parts together, and then injecting liquid and forming.
Preferably, the step S2 is performed by slitting with a slitter.
Preferably, the S3 is performed by using a laser die cutting machine.
Preferably, the step S4 is performed by using a winder.
It is a second object of the present invention to provide a non-stressed end-face shaping battery, which is manufactured by the above manufacturing process.
The invention has the advantages and positive effects that:
1. according to the invention, through the stress pre-release design, the deformation of the battery cell in the end face shaping process is obviously reduced, so that the generation of metal chips is effectively reduced, and the probability of abnormal self-discharge of the battery is reduced.
2. The invention has little influence on the current collecting area and almost has no influence on the overcurrent capacity of the end face shaping battery.
3. The cylindrical battery applied by the invention has the following range: the diameter of the battery is more than 3mm, and the height is more than 20mm
4. The invention can be used in chemical energy storage battery systems such as lithium ion batteries, sodium ion batteries, potassium ion batteries, super capacitors and the like.
Drawings
FIG. 1 is a schematic view of a stress relief structure according to the present invention;
FIG. 2 is a self-discharging abnormal cell ratio for end face shaped cells using different designs;
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1 to 2, the technical solution of the present invention is:
a manufacturing process of a cylindrical lithium ion battery with quick charging performance comprises the following steps:
example 1
(1) Firstly, slurry containing a positive electrode active substance and a negative electrode active substance is respectively coated on an aluminum foil current collector and a copper foil current collector, and uncoated areas with the width of 20mm are reserved on the two side edges of the aluminum foil current collector and the copper foil current collector.
(2) And cutting the current collectors of the aluminum foil and the copper foil coated with the active substances into proper widths by using a cutting machine.
(3) A laser die cutting machine is adopted to cut a series of small gaps 1 with the width of 2mm for releasing stress in the uncoated area of the reserved uncoated area of the aluminum foil and the copper foil current collector according to a preset program, and the gaps 1 are shown in the following figure 1.
(4) Winding the positive and negative pole pieces and the diaphragm after the stress release into a battery cell by using a winding machine;
(5) and shaping the positive and negative electrode end faces of the battery into a flat shape by adopting special end face shaping equipment.
(6) And welding the welding disc with the shaped end faces of the positive and negative electrodes.
(7) And assembling the welded battery core and the parts together, and then injecting and forming to obtain the finished battery.
Example 2
(1) Firstly, slurry containing a positive electrode active substance and a negative electrode active substance is respectively coated on an aluminum foil current collector and a copper foil current collector, and uncoated areas with the width of 20mm are reserved on the two side edges of the aluminum foil current collector and the copper foil current collector.
(2) And cutting the current collectors of the aluminum foil and the copper foil coated with the active substances into proper widths by using a cutting machine.
(3) The uncoated areas reserved for the current collectors of the aluminum foil and the copper foil are cut into a series of small gaps with the width of 4mm for releasing stress according to a preset program by using a laser die cutting machine, as shown in the following figure 1.
(4) Winding the positive and negative pole pieces and the diaphragm after the stress release into a battery cell by using a winding machine;
(5) and shaping the positive and negative electrode end faces of the battery into a flat shape by adopting special end face shaping equipment.
(6) And welding the welding disc with the shaped end faces of the positive and negative electrodes.
(7) And assembling the welded battery core and the parts together, and then injecting and forming to obtain the finished battery.
Example 3
(1) firstly, respectively coating slurry containing a positive electrode active material and a negative electrode active material on an aluminum foil current collector and a copper foil current collector, and reserving uncoated areas with the width of 20mm at the two side edges of the aluminum foil current collector and the copper foil current collector.
(2) And cutting the current collectors of the aluminum foil and the copper foil coated with the active substances into proper widths by using a cutting machine.
(3) The uncoated areas reserved for the current collectors of the aluminum foil and the copper foil are cut into a series of small gaps with the width of 2mm for releasing stress according to a preset program by using a laser die cutting machine, as shown in the following figure 1.
(4) Winding the positive and negative pole pieces and the diaphragm after the stress release into a battery cell by using a winding machine;
(5) and shaping the positive and negative electrode end faces of the battery into a flat shape by adopting special end face shaping equipment.
(6) And welding the positive and negative connecting sheets with the shaped positive and negative end surfaces.
(7) Welding the positive and negative connecting sheets with the positive and negative terminals
(7) And assembling the welded battery core and the parts together, and then injecting and forming to obtain the finished battery.
Comparative example
(1) Firstly, slurry containing a positive electrode active substance and a negative electrode active substance is respectively coated on an aluminum foil and a copper foil current collector, and uncoated areas with the width of 20mm are reserved on the edges of two sides of the aluminum foil and the copper foil current collector.
(2) And cutting the current collectors of the aluminum foil and the copper foil coated with the active substances into proper widths by using a cutting machine.
(4) Winding the positive and negative pole pieces and the diaphragm into a battery cell by using a winding machine;
(5) and shaping the positive and negative electrode end faces of the battery into a flat shape by adopting special end face shaping equipment.
(6) And welding the welding disc with the shaped end faces of the positive and negative electrodes.
(7) And assembling the welded battery core and the parts together, and then injecting and forming to obtain the finished battery.
Test method
Discharging the battery at constant current of 0.2C rate to 2.75V at 25 + -5 deg.C, standing for 24h, measuring open-circuit voltage V1 of the battery, standing for one month, measuring voltage V2 of the battery again, calculating voltage attenuation V1-V2 during storage, and calculating the proportion of the battery with voltage attenuation over 50mV in the storage battery.
The prestress release design is adopted, the self-discharge abnormal proportion of the end face shaping battery is greatly reduced to about 5% from about 15% of the battery in the conventional design, and the prestress release design is proved to be capable of well absorbing the deformation in the end face shaping process, reducing the generation of metal chips and reducing the self-discharge abnormal probability of the battery.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (5)
1. A manufacturing process of a stress-free end face shaping battery is characterized by comprising the following steps:
s1, respectively coating the slurry containing the positive electrode active substance and the negative electrode active substance on an aluminum foil current collector and a copper foil current collector, and reserving uncoated areas with certain widths at the edges of two sides of the aluminum foil current collector and the copper foil current collector;
s2, cutting the aluminum foil and the copper foil current collector coated with the active substances into required widths;
s3, cutting a plurality of notches with certain width for releasing stress in the uncoated areas reserved for the aluminum foil and the copper foil current collectors;
s4, winding the positive and negative pole pieces and the diaphragm after stress release into a battery cell;
s5, flattening the end faces of the positive electrode and the negative electrode of the battery;
s6, welding the welding disc with the shaped positive and negative electrode end faces, or welding the positive and negative electrode connecting sheets with the shaped positive and negative electrode end faces, and simultaneously welding the positive and negative electrode connecting sheets with the positive and negative electrode terminals;
and S7, assembling the welded battery cell and the parts together, and then injecting liquid and forming.
2. The process of manufacturing a non-stressed end-face shaping battery according to claim 1, wherein the step S2 is performed by slitting with a slitter.
3. The process of manufacturing a non-stressed end-face shaping battery as claimed in claim 1, wherein said S3 is performed by using a laser die cutting machine.
4. The process of manufacturing a non-stressed end-face shaping battery as claimed in claim 1, wherein said S4 is performed by using a winding machine.
5. A stress-free end-face shaping battery manufactured by the manufacturing process of any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011171282.3A CN112510212A (en) | 2020-10-28 | 2020-10-28 | Stress-free end face shaping battery and manufacturing process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011171282.3A CN112510212A (en) | 2020-10-28 | 2020-10-28 | Stress-free end face shaping battery and manufacturing process thereof |
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| CN112510212A true CN112510212A (en) | 2021-03-16 |
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| CN202011171282.3A Pending CN112510212A (en) | 2020-10-28 | 2020-10-28 | Stress-free end face shaping battery and manufacturing process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488699A (en) * | 2021-05-08 | 2021-10-08 | 上海兰钧新能源科技有限公司 | Packaging method of soft package lithium battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20210316 |
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