CN111129395A - Transverse stretching and shrinking shaping process after extraction of wet lithium battery diaphragm - Google Patents
Transverse stretching and shrinking shaping process after extraction of wet lithium battery diaphragm Download PDFInfo
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- CN111129395A CN111129395A CN201911271624.6A CN201911271624A CN111129395A CN 111129395 A CN111129395 A CN 111129395A CN 201911271624 A CN201911271624 A CN 201911271624A CN 111129395 A CN111129395 A CN 111129395A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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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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- 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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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention provides a transverse drawing shrinkage sizing process after extraction of a wet lithium battery diaphragm, and belongs to the field of manufacture of wet lithium battery diaphragms. The utility model provides a wet process lithium cell diaphragm extraction back violently draw shrink design technology, includes the extraction step and the violently draw shrink design step that go on in proper order, before the diaphragm carries out violently draw shrink design technology, gets into violently draw shrink design step after the side cut, utilizes special clip centre gripping diaphragm to move on the clip track under the drive of track carousel, and the diaphragm is in proper order through preheating, horizontal stretching, heat setting, horizontal longitudinal shrinkage, transition, the cooling, reaches the export finally. The invention can avoid the phenomenon of transverse pulling and tearing, improve the production efficiency, reduce the thermal shrinkage rate of the diaphragm when in use, avoid the phenomenon of short circuit between the anode and the cathode and improve the safety of the battery.
Description
Technical Field
The invention relates to the technical field of wet-process lithium battery diaphragm production, in particular to a transverse stretching and shrinking shaping process after extraction of a wet-process lithium battery diaphragm.
Background
And the electrolyte can be sufficiently collected, a lithium ion channel of the electrolyte can be sufficiently provided, and the micropore self-closing protection function can be realized. The lithium ion conductivity of the separator is directly related to the overall performance of the lithium ion battery, and the performance of the separator determines the interface structure of the battery, the retentivity of electrolyte, the internal resistance of the battery and the like, so that the important characteristics of the battery, such as capacity, cycle performance, charge-discharge current density, safety and the like, are influenced.
Existing wet separator manufacturing methods generally include: batching and casting → bidirectional stretching → extraction → transverse stretching → rolling inspection. And (4) extracting and drying the oil film to obtain a microporous diaphragm, and transversely stretching the microporous diaphragm until rolling and inspecting. The phenomenon of thick ear edges at the position of the clamp can be caused by the oil film subjected to bidirectional stretching, so that complete extraction at the extraction position cannot be guaranteed. The film is easy to tear when directly entering the transverse stretching step, so that the film breaking phenomenon is caused, and the continuous production is influenced. And the diaphragm cannot completely release self internal stress through a transverse stretching step under a certain temperature condition, so that the high-temperature heat shrinkage rate is increased when the diaphragm is installed in a battery for use, the phenomenon of contact short circuit of a positive electrode and a negative electrode is caused, and the safety of the battery is reduced.
In view of this, it is particularly important to design a wet-process lithium battery transverse drawing process, especially in the field of wet-process lithium battery diaphragm production.
Disclosure of Invention
The invention aims to provide a transverse stretching and shrinking shaping process after extraction of a wet lithium battery diaphragm, and the process is used for solving the problem that in the prior art, the high-temperature heat shrinkage rate of the diaphragm is high and the short circuit of a positive electrode and a negative electrode is caused because the diaphragm cannot completely release internal stress.
In order to solve the technical problem, the transverse stretching and shrinking shaping process after the extraction of the wet lithium battery diaphragm is characterized by comprising the following steps of: the method comprises an extraction step and a transverse drawing shrinkage shaping step which are sequentially carried out, wherein before the transverse drawing shrinkage shaping process is carried out on the diaphragm, the thick edges on two sides of the diaphragm which is just extracted are removed, and the diaphragm sequentially enters preheating, transverse drawing, heat shaping, transverse longitudinal shrinkage, transition and cooling after edge cutting and finally reaches an outlet.
Preferably, the bead width of each side cut off is 5-15 cm.
Preferably, the stretching angle of the track is less than or equal to 15 degrees in the transverse direction.
Preferably, the membrane is stretched transversely first and then shrunk transversely and longitudinally during the transverse drawing.
More preferably, the transverse contraction amplitude is less than or equal to 20 percent, and the longitudinal contraction amplitude is less than or equal to 10 percent.
Further, the time of the diaphragm passing through the preheating stage is 4-12s, the time of the diaphragm passing through the stretching stage is 6-18s, the time of the diaphragm passing through the heat setting stage is 6-18s, the time of the diaphragm passing through the transverse longitudinal shrinkage stage is 6-18s, the time of the diaphragm passing through the transition stage is 2-6s, the time of the diaphragm passing through the cooling stage is 4-12s, and finally the diaphragm reaches the outlet.
Preferably, the diaphragm preheating stage windbox, the transverse stretching stage windbox, the heat setting stage windbox, the transverse longitudinal shrinkage stage windbox and the transition stage windbox are kept at a temperature of 80-160 ℃ plus or minus 0.5 ℃, and the cooling stage windbox is kept at a temperature of 25 ℃ plus or minus 1 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. directly cutting off the thick ear edge which is not completely extracted in the extraction step, and avoiding the direct entering of the ear edge into the transverse pulling to cause tearing and influence on the production efficiency.
2. The diaphragm is in the horizontal drawing shrink design in-process, and the order is through preheating, drawing, heat setting, horizontal longitudinal contraction, the transition, and the cooling reaches the export at last, can release self inside residual stress completely, and high temperature thermal shrinkage rate becomes high when avoiding the later stage to use, causes the phenomenon of positive negative pole connection short circuit, can promote battery security.
Drawings
FIG. 1 is a flow chart of a post-extraction cross-draw shrinkage sizing process of the present invention.
FIG. 2 is a schematic view of a cross-draw shrink-setting process.
The reference numbers in the figures are: 1-clip rail, 2-preheating stage bellows, 3-stretching stage bellows, 4-heat setting stage bellows, 5-transverse longitudinal shrinkage stage bellows, 6-transition stage bellows, 7-cooling stage bellows and 8-rail turntable.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the process for transverse drawing, shrinking and shaping after extraction of the wet lithium battery diaphragm comprises a step of edge cutting after extraction and a step of transverse drawing, shrinking and shaping. In the step of transverse drawing, contraction and shaping, the special clamp is used for clamping the diaphragm to run on the clamp track under the drive of the track turntable, and the diaphragm is sequentially preheated, transversely stretched, heat-shaped, transversely and longitudinally contracted, transited and cooled and finally reaches an outlet.
In the transverse drawing shrinkage shaping step, before the membrane enters the preheating stage, the thick edges on two sides of the membrane just taken out of the extraction step need to be cut off, and the width of the thick edges is 5-15 cm.
In the step of transverse drawing, extraction, shrinkage and shaping, when the diaphragm passes through a transverse drawing stage, the drawing angle of the track is less than or equal to 15 degrees.
In the step of transverse drawing, extraction, shrinkage and shaping, when the diaphragm passes through a transverse longitudinal shrinkage stage, the transverse shrinkage amplitude is less than or equal to 20 percent, and the longitudinal shrinkage amplitude is less than or equal to 10 percent. The time of the diaphragm passing through the preheating stage is 4-12s, the time of the diaphragm passing through the transverse stretching stage is 6-18s, the time of the diaphragm passing through the heat setting stage is 6-18s, the time of the diaphragm passing through the transverse longitudinal shrinkage stage is 6-18s, the time of the diaphragm passing through the transition stage is 2-6s, the time of the diaphragm passing through the cooling stage is 4-12s, and finally the diaphragm reaches an outlet. The temperature of the bellows in the preheating stage, the temperature of the bellows in the transverse stretching stage, the temperature of the bellows in the heat setting stage, the temperature of the bellows in the transverse and longitudinal shrinkage stage and the temperature of the bellows in the transition stage are kept at (80-160) ° C +/-0.5 ℃, and the temperature of the bellows in the cooling stage is kept at 25 ℃ +/-1 ℃.
Example 1
(1) Cutting off the thick edges on the two sides of the diaphragm just taken out of the extraction step, wherein the width of the cut thick edges is 8 cm;
(2) the stretching angle of the track in the transverse stretching stage is set to be 12 degrees;
(3) setting the transverse contraction amplitude to be 15 percent and the longitudinal contraction amplitude to be 5 percent;
(4) the time of the diaphragm passing through the preheating stage is 7s, the time of the diaphragm passing through the transverse stretching stage is 11s, the time of the diaphragm passing through the heat setting stage is 11s, the time of the diaphragm passing through the transverse longitudinal shrinkage stage is 11s, the time of the diaphragm passing through the transition stage is 4s, and the time of the diaphragm passing through the cooling stage is 7 s;
(5) the temperature of the bellows in the preheating stage is set to be 130 +/-0.5 ℃, the temperature of the bellows in the transverse stretching stage is set to be 133 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the transverse longitudinal contraction stage is set to be 133 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 130 +/-0.5 ℃ and the temperature of the bellows in the cooling stage is set to be 25 +/-1 ℃.
Example 2
(1) Cutting off the thick edges on the two sides of the diaphragm just taken out of the extraction step, wherein the width of the cut thick edges is 8 cm;
(2) the stretching angle of the track in the transverse stretching stage is set to be 12 degrees;
(3) setting the transverse contraction amplitude to be 20% and the longitudinal contraction amplitude to be 10%;
(4) the time of the diaphragm passing through the preheating stage is 7s, the time of the diaphragm passing through the transverse stretching stage is 11s, the time of the diaphragm passing through the heat setting stage is 11s, the time of the diaphragm passing through the transverse longitudinal shrinkage stage is 11s, the time of the diaphragm passing through the transition stage is 4s, and the time of the diaphragm passing through the cooling stage is 7 s;
(5) the temperature of the bellows in the preheating stage is set to be 130 +/-0.5 ℃, the temperature of the bellows in the transverse stretching stage is set to be 133 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the transverse longitudinal contraction stage is set to be 134 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 131 +/-0.5 ℃ and the temperature of the bellows in the cooling stage is set to be 25 +/-1 ℃.
Comparative example 1
(1) Cutting off the thick edges on the two sides of the diaphragm just taken out of the extraction step, wherein the width of the cut thick edges is 8 cm;
(2) the stretching angle of the track in the transverse stretching stage is set to be 10 degrees;
(3) setting the transverse contraction amplitude to be 10% and the longitudinal contraction amplitude to be 0%;
(4) the time of the diaphragm passing through the preheating stage is 6s, the time of the diaphragm passing through the stretching stage is 9s, the time of the diaphragm passing through the heat setting stage is 9s, the time of the diaphragm passing through the transverse and longitudinal shrinkage stages is 9s, the time of the diaphragm passing through the transition stage is 3s, and the time of the diaphragm passing through the cooling stage is 6 s;
(5) the temperature of the bellows in the preheating stage is set to be 130 +/-0.5 ℃, the temperature of the bellows in the stretching stage is set to be 133 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the transverse and longitudinal shrinkage stage is set to be 133 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 130 +/-0.5 ℃ and the temperature of the bellows in the cooling stage is set to be 25 +/-1 ℃.
Comparative example 2
(1) Cutting off the thick edges on the two sides of the diaphragm just taken out of the extraction step, wherein the width of the cut thick edges is 8 cm;
(2) the stretching angle of the track in the transverse stretching stage is set to be 12 degrees;
(3) setting the transverse contraction amplitude to be 15 percent and the longitudinal contraction amplitude to be 5 percent;
(4) the time of the diaphragm passing through the preheating stage is 7s, the time of the diaphragm passing through the stretching stage is 11s, the time of the diaphragm passing through the heat setting stage is 11s, the time of the diaphragm passing through the transverse and longitudinal shrinkage stages is 11s, the time of the diaphragm passing through the transition stage is 4s, and the time of the diaphragm passing through the cooling stage is 7 s;
(5) the temperature of the bellows in the preheating stage is set to be 132 +/-0.5 ℃, the temperature of the bellows in the stretching stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 138 +/-0.5 ℃, the temperature of the bellows in the transverse and longitudinal shrinkage stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 130 +/-0.5 ℃ and the temperature of the bellows in the cooling stage is set to be 25 +/-1 ℃.
Comparative example 3
(1) Cutting off the thick edges on the two sides of the diaphragm just taken out of the extraction step, wherein the width of the cut thick edges is 8 cm;
(2) the stretching angle of the track in the transverse stretching stage is set to be 12 degrees;
(3) setting the transverse contraction amplitude to be 15 percent and the longitudinal contraction amplitude to be 10 percent;
(4) the time of the diaphragm passing through the preheating stage is 8s, the time of the diaphragm passing through the stretching stage is 12s, the time of the diaphragm passing through the heat setting stage is 12s, the time of the diaphragm passing through the transverse and longitudinal shrinkage stages is 12s, the time of the diaphragm passing through the transition stage is 4s, and the time of the diaphragm passing through the cooling stage is 6 s;
(5) the temperature of the bellows in the preheating stage is set to be 130 +/-0.5 ℃, the temperature of the bellows in the stretching stage is set to be 133 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the transverse and longitudinal shrinkage stage is set to be 134 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 131 +/-0.5 ℃ and the temperature of the bellows in the cooling stage is set to be 25 +/-1 ℃.
The transverse stretching and shrinking shaping process after the extraction of the wet lithium battery separator is described above for helping understanding of the present invention, but the embodiments of the present invention are not limited by the above examples, and any changes, modifications, substitutions, combinations, and simplifications that do not depart from the principle of the present invention shall be equivalent substitutions, and shall be included in the protection scope of the present invention.
Claims (7)
1. The transverse drawing shrinkage shaping process after the extraction of the wet lithium battery diaphragm is characterized by comprising an extraction step and a transverse drawing shrinkage shaping step which are sequentially carried out, wherein before the transverse drawing shrinkage shaping process is carried out on the diaphragm, thick edges on two sides of the diaphragm which is just extracted are removed, and the diaphragm is sequentially preheated, transversely stretched, heat-shaped, transversely longitudinally shrunk, transited and cooled after the edges are cut, and finally reaches an outlet.
2. The process of claim 1, wherein the width of the thick edge cut off from each side is 5-15 cm.
3. The process of claim 1, wherein the stretching angle of the rails during the transverse stretching is less than or equal to 15 °.
4. The process of claim 1, wherein the transverse stretching is performed before the transverse stretching and the transverse and longitudinal shrinking are performed during the transverse stretching.
5. The process of claim 4, wherein the transverse shrinkage is less than or equal to 20% and the longitudinal shrinkage is less than or equal to 10%.
6. The process of claim 4, wherein the membrane is subjected to the preheating stage for 4 to 12 seconds, the stretching stage for 6 to 18 seconds, the heat setting stage for 6 to 18 seconds, the transverse and longitudinal shrinkage stage for 6 to 18 seconds, the transition stage for 2 to 6 seconds, the cooling stage for 4 to 12 seconds, and finally reaches the outlet.
7. The process of claim 6, wherein the temperatures of the bellows in the preheating stage, the bellows in the transverse stretching stage, the bellows in the heat setting stage, the bellows in the transverse and longitudinal shrinking stage and the bellows in the transition stage are maintained at 80-160 ℃ plus or minus 0.5 ℃, and the temperature of the bellows in the cooling stage is maintained at 25 ℃ plus or minus 1 ℃.
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| CN201911271624.6A CN111129395A (en) | 2019-12-12 | 2019-12-12 | Transverse stretching and shrinking shaping process after extraction of wet lithium battery diaphragm |
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| CN201911271624.6A CN111129395A (en) | 2019-12-12 | 2019-12-12 | Transverse stretching and shrinking shaping process after extraction of wet lithium battery diaphragm |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531286A (en) * | 2020-12-22 | 2021-03-19 | 中材锂膜有限公司 | Wet process lithium battery diaphragm violently draws shrink setting device |
| WO2023159835A1 (en) * | 2022-02-25 | 2023-08-31 | 中材锂膜有限公司 | Separator having flat surface as well as preparation method therefor and use thereof |
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| CN112531286A (en) * | 2020-12-22 | 2021-03-19 | 中材锂膜有限公司 | Wet process lithium battery diaphragm violently draws shrink setting device |
| WO2023159835A1 (en) * | 2022-02-25 | 2023-08-31 | 中材锂膜有限公司 | Separator having flat surface as well as preparation method therefor and use thereof |
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