CN111048820A - Hot pressing method of battery cell and application thereof - Google Patents
Hot pressing method of battery cell and application thereof Download PDFInfo
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- CN111048820A CN111048820A CN201911204010.6A CN201911204010A CN111048820A CN 111048820 A CN111048820 A CN 111048820A CN 201911204010 A CN201911204010 A CN 201911204010A CN 111048820 A CN111048820 A CN 111048820A
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- hot pressing
- mould
- hot
- straight lines
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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
- H01M10/0468—Compression means for stacks of electrodes and separators
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
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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
Abstract
The invention discloses a hot pressing method of a battery cell and application thereof, wherein the hot pressing method of the battery cell comprises the following steps: carry out the hot pressing to electric core with the mould, hot pressing temperature is 80 ~ 100 ℃, hot pressing time is 20 ~ 250s, hot pressing pressure is 1 ~ 6t, the mould includes mould and bed die, place electric core between last mould and bed die during hot pressing, top surface at the bed die and/or the bottom surface of last mould are formed with sunken gridlines, the gridlines comprises 2 group's criss-cross straight lines, the quantity of every group sharp is many and is parallel to each other between the straight line, the distance of arbitrary 2 adjacent sharp in every group sharp is 0.1 ~ 2.0mm, the contained angle of 2 group's criss-cross straight lines is 40 ~ 90. The hot pressing method can reduce the ventilation increment, further reduce the internal resistance of the battery, reduce the polarization phenomenon of the battery, improve the electrolyte injection guiding function, reduce the injection time and reduce the infiltration time.
Description
Technical Field
The invention belongs to the technical field of battery diaphragms, and particularly relates to a hot-pressing method of a battery core and application thereof.
Background
In the application of the PVDF coating diaphragm in the battery, the hardness of the battery core is increased mainly by the gel electrolyte principle and the function of bonding the diaphragm and the pole piece.
For a glued diaphragm product, the battery is often shaped by hot pressing in the process of assembling the battery, and the hot pressing is commonly called hot pressing shaping, which refers to the process of shaping the battery core through a hot pressing process after a battery pole piece and a diaphragm are wound into the battery core, so that the battery core is convenient to be placed into a shell. At present, the battery cell is assembled by winding or laminating, and is shaped by a corresponding hot pressing process, and then the shaped battery cell is placed into a shell. However, the ventilation value of the separator is increased at the same time of hot pressing at present, namely, the pore blocking effect is increased, and further, the increase of the internal resistance of the battery and the increase of the polarization of the battery are reflected on the battery.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a hot pressing method of a battery cell, which mainly solves the problems of overlarge ventilation increment, increased internal resistance and larger polarization after hot pressing of a glue coating film. The cell obtained by the hot pressing method reduces the ventilation increment on the premise that the cohesive force meets the requirement, further reduces the internal resistance of the cell, reduces the polarization phenomenon of the cell, improves the electrolyte injection guiding function after hot pressing, and reduces the infiltration time.
The purpose of the invention is realized by the following technical scheme.
A method for hot-pressing a battery cell comprises the following steps:
the battery cell is hot-pressed by a mould, the hot-pressing temperature is 80-100 ℃, the hot-pressing time is 20-250 s, the hot-pressing pressure is 1-6 t, the mould comprises an upper mould and a lower mould, the battery cell is placed between the upper mould and the lower mould during hot pressing, a concave grid line is formed on the top surface of the lower mould and/or the bottom surface of the upper mould, the grid line consists of 2 groups of crossed straight lines, the number of each group of straight lines is multiple, the multiple straight lines are parallel to each other, the distance between any 2 adjacent straight lines in each group of straight lines is 0.1-2.0 mm, and the included angle between the 2 groups of crossed straight lines is 40-90 degrees.
In the above technical scheme, when recessed grid lines are formed on both the top surface of the lower die and the bottom surface of the upper die, the upper die and the lower die are identical and arranged in mirror symmetry.
In the technical scheme, the line width of each straight line is 0.05-1.5 mm.
The application of the hot pressing method in reducing the ventilation increment of the diaphragm.
The hot pressing method is applied to shortening the electrolyte injection time of the battery.
The invention has the following beneficial effects:
1. the ventilation and value increase are reduced, so that the internal resistance of the battery is reduced, and the polarization phenomenon of the battery is reduced;
2. the electrolyte injection guiding function is improved, the electrolyte injection time is reduced, and the infiltration time is reduced.
Drawings
Fig. 1 is a photograph of a PVDF coated separator disassembled from a hot pressed cell.
Detailed Description
The technical scheme of the invention is further explained by combining specific examples.
Ternary materials: li (NiCoMn) O2The mass ratio of nickel, cobalt and manganese is 8:1: 1.
PVDF coating membrane source: 3kg of PVDF and 0.1kg of modified polyether polymer (purchased from Tianjin Sepu Rui New energy science and technology Co., Ltd.) were added to 23.00kg of deionized water, and the mixture was stirred for 2 hours to disperse the mixture uniformly, and then the mixture was sanded at a speed of 800RPM for 30 minutes. And after sanding, sequentially adding 0.5kg of CMC and 1.5kg of polymethyl acrylate, and uniformly stirring to obtain the PVDF membrane slurry. And coating the PVDF membrane slurry on one side of a base membrane by a micro gravure roller coating process, and then drying for 1.5min by a baking oven at 55 ℃ to form a 2um coating, thereby obtaining the PVDF coating membrane.
Example 1
A method of hot-pressing a cell (line hot-pressing), comprising:
carry out the hot pressing to electric core with the mould, hot pressing temperature is 80 ℃, hot pressing time is 20s, hot pressing pressure is 1.5t, the mould includes mould and the bed die that is located the mould below, place electric core between mould and bed die during hot pressing, be formed with sunken gridlines on the bottom surface of last mould, the gridlines comprises 2 group's criss-cross straight lines, the quantity of every group sharp is many and is parallel to each other between many sharp, the distance of arbitrary 2 adjacent sharp in every group sharp is 0.8mm, 2 group's alternately sharp contained angles are 90. The line width of each line was 0.4 mm.
The electric core in this embodiment is: the square aluminum-shell battery is characterized in that a PVDF coating diaphragm is adopted as a diaphragm, and a ternary material is used as a positive electrode material; graphite is used as a negative electrode material.
Fig. 1 is a photograph of the PVDF coating diaphragm disassembled from the electric core after hot pressing, and it can be seen from fig. 1 that after the hot pressing method of the present invention, the PVDF coating diaphragm presents a white line at a position opposite to the grid lines during hot pressing, and has a good guiding effect on the subsequent electrolyte injection. The arrangement of the 2 groups of crossed straight lines can carry out the infiltration of the electrolyte from all angles in the transverse direction and the longitudinal direction, and the electrolyte distribution is more uniform. Avoid single horizontal line type hot pressing or vertical line type hot pressing to lead to "damming" phenomenon in the electrolyte notes liquid process, avoided the not enough drawback of infiltration nature of electrolyte that consequently causes.
Comparative example 1
Comparative example 1 the method used was the same as example 1, except that comparative example 1 used an upper mold having a flat bottom surface, i.e., no recessed grid lines.
Example 2
A method of hot-pressing a cell (line hot-pressing), comprising:
carry out the hot pressing to electric core with the mould, hot pressing temperature is 90 ℃, hot pressing time is 60s, hot pressing pressure is 4.0t, the mould includes mould and the bed die that is located the mould below, place electric core between mould and bed die during hot pressing, be formed with sunken gridlines on the bottom surface of last mould, the gridlines comprises 2 group's criss-cross straight lines, the quantity of every group sharp is many and is parallel to each other between many sharp, the distance of arbitrary 2 adjacent sharp in every group sharp is 0.6mm, 2 group's alternately sharp contained angles are 60. The line width of each line was 0.3 mm.
The electric core in this embodiment is: the square aluminum-shell battery is characterized in that a PVDF coating diaphragm is adopted as a diaphragm, and a ternary material is used as a positive electrode material; graphite is used as a negative electrode material.
Example 3
A method of hot-pressing a cell (line hot-pressing), comprising:
carry out the hot pressing to electric core with the mould, hot pressing temperature is 100 ℃, hot pressing time is 200s, hot pressing pressure is 3.0t, the mould includes mould and the bed die that is located the mould below, place electric core between mould and bed die during hot pressing, be formed with sunken gridlines on the bottom surface of last mould, the gridlines comprises 2 group's criss-cross straight lines, the quantity of every group sharp is many and is parallel to each other between many sharp, the distance of arbitrary 2 adjacent sharp in every group sharp is 1.0mm, 2 group's alternately sharp contained angles are 75. The line width of each line was 0.5 mm.
The electric core in this embodiment is: the square aluminum-shell battery is characterized in that a PVDF coating diaphragm is adopted as a diaphragm, and a ternary material is used as a positive electrode material; graphite is used as a negative electrode material.
Table 1 shows the differences between examples 1 to 3 and comparative example 1: on the premise that a certain adhesive force exists between the PVDF coating diaphragm and the pole piece, the linear hot pressing has smaller compression effect on the diaphragm, so the ventilation value increase after the hot pressing is lower; the thickness is reduced to a smaller extent, and more space exists between the diaphragm and the pole piece. The linear hot pressing of embodiments 1-3 has greatly reduced the notes liquid time of battery to the direction effect of electrolyte notes liquid in-process.
TABLE 1
| Parameter(s) | Unit of | Before electric core hot pressing | Comparative example 1 | Example 1 | Example 2 | Example 3 |
| Thickness of the diaphragm | um | 14.2 | 13.3 | 13.7 | 13.6 | 13.8 |
| Is breathable | s/100ml | 163.5 | 192.3 | 178.4 | 177.8 | 176.3 |
| Time of injection | s | - | 13.8 | 8.7 | 8.8 | 9.0 |
| Adhesive force | N | - | 16.3 | 12.7 | 13.1 | 12.5 |
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (5)
1. A method for hot-pressing a battery cell is characterized by comprising the following steps:
the battery cell is hot-pressed by a mould, the hot-pressing temperature is 80-100 ℃, the hot-pressing time is 20-250 s, the hot-pressing pressure is 1-6 t, the mould comprises an upper mould and a lower mould, the battery cell is placed between the upper mould and the lower mould during hot pressing, a concave grid line is formed on the top surface of the lower mould and/or the bottom surface of the upper mould, the grid line consists of 2 groups of crossed straight lines, the number of each group of straight lines is multiple, the multiple straight lines are parallel to each other, the distance between any 2 adjacent straight lines in each group of straight lines is 0.1-2.0 mm, and the included angle between the 2 groups of crossed straight lines is 40-90 degrees.
2. The hot pressing method according to claim 1, wherein when recessed grid lines are formed on both the top surface of the lower mold and the bottom surface of the upper mold, the upper mold and the lower mold are identical and arranged in mirror symmetry.
3. The hot pressing method according to claim 1 or 2, wherein the line width of each straight line is 0.05 to 1.5 mm.
4. Use of the hot pressing method according to claim 1 for reducing the gas permeation gain of a separator.
5. Use of the hot pressing method according to claim 1 for shortening the electrolyte filling time of a battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911204010.6A CN111048820B (en) | 2019-11-29 | 2019-11-29 | Hot pressing method of battery cell and application thereof |
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| CN201911204010.6A CN111048820B (en) | 2019-11-29 | 2019-11-29 | Hot pressing method of battery cell and application thereof |
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| CN111048820B CN111048820B (en) | 2021-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114079125A (en) * | 2020-08-10 | 2022-02-22 | 北京小米移动软件有限公司 | Battery cell, manufacturing method thereof, battery and electronic equipment |
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| CN108140802A (en) * | 2015-10-23 | 2018-06-08 | 日产自动车株式会社 | Electrode and its manufacturing method |
| CN108963325A (en) * | 2018-08-14 | 2018-12-07 | 桑德集团有限公司 | Soft bag lithium ionic cell and preparation method thereof and electrical equipment |
| CN110000987A (en) * | 2019-04-25 | 2019-07-12 | 深圳市新世纪自动化科技有限公司 | Hot pressing anti-sticking cushion and preparation method thereof, molding die and lithium battery hot-press arrangement |
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| EP0614237A1 (en) * | 1993-01-18 | 1994-09-07 | Yuasa Corporation | A battery precursor, a method for manufacturing the battery precursor, a battery, and a method for manufacturing the battery |
| CN1357935A (en) * | 2000-12-15 | 2002-07-10 | 财团法人工业技术研究院 | Laminated battery structure |
| US20110206985A1 (en) * | 2010-02-23 | 2011-08-25 | Hitachi, Ltd. | Lithium secondary battery and method for manufacturing the same |
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| CN114079125A (en) * | 2020-08-10 | 2022-02-22 | 北京小米移动软件有限公司 | Battery cell, manufacturing method thereof, battery and electronic equipment |
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| CN111048820B (en) | 2021-01-08 |
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