CN115195095A - High-safety stretching device for wet-process synchronous lithium ion battery diaphragm - Google Patents
High-safety stretching device for wet-process synchronous lithium ion battery diaphragm Download PDFInfo
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- CN115195095A CN115195095A CN202210533985.9A CN202210533985A CN115195095A CN 115195095 A CN115195095 A CN 115195095A CN 202210533985 A CN202210533985 A CN 202210533985A CN 115195095 A CN115195095 A CN 115195095A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 58
- 239000012528 membrane Substances 0.000 claims description 65
- 238000009998 heat setting Methods 0.000 claims description 14
- 239000004744 fabric Substances 0.000 claims description 13
- 230000007480 spreading Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
-
- 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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- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a high-safety stretching device for a wet-process synchronous lithium ion battery diaphragm, which comprises a diaphragm connecting module (10), an expanding module (20) and a fixed-amplitude module (30), wherein one diaphragm connecting module (10), the expanding module (20) and the fixed-amplitude module (30) are connected by adopting the same annular track (4) with a transmission chain clamp (5), the two modules are symmetrically distributed, the distance between the two expanding modules (20) is gradually expanded along the running direction of the diaphragm, and the average speed of the transmission chain clamp (5) at the diaphragm connecting module (10) is less than that of the transmission chain clamp (5) at the fixed-amplitude module (30). The diaphragm prepared by the stretching device has higher longitudinal tensile strength relative to transverse tensile strength, lower longitudinal elongation at break relative to transverse elongation at break, closer thermal shrinkage in two directions and better consistency, and effectively avoids the safety problem caused by battery short circuit.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to the technical field of lithium battery diaphragms, and specifically relates to a high-safety stretching device for a wet-process synchronous lithium ion battery diaphragm.
Background
With the development of the new energy automobile industry, the lithium ion battery diaphragm is more and more deeply recognized and has higher requirements, and a refined and customized high-safety diaphragm gradually becomes a trend. The consistency of the wet-process synchronous stretching diaphragm is better than that of an asynchronous stretching diaphragm, and the lithium battery diaphragm is longitudinally wound in a battery, so that the longitudinal tensile strength of the lithium battery diaphragm needs to be improved, the longitudinal elongation at break needs to be reduced, and the existing stretching device cannot meet the requirement.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a high-safety stretching device for a wet-process synchronous lithium ion battery diaphragm, which avoids spontaneous combustion of an electric automobile caused by longitudinal short circuit and improves safety by improving the longitudinal tensile strength of the lithium ion battery diaphragm, reducing the longitudinal elongation at break and simultaneously considering the thermal shrinkage in two directions.
The invention aims to solve the problems by the following technical scheme:
the utility model provides a high security wet process synchronization lithium ion battery diaphragm's stretching device which characterized in that: the stretching device comprises a film connecting module located in a preheating area, an expanding module located in a stretching area and a fixed-width module located in a heat setting area, wherein one group of the film connecting module, the expanding module and the fixed-width module are connected by adopting the same annular track, and a transmission chain clamp used for clamping the side edge of a battery diaphragm is arranged on the annular track, two groups of the film connecting module, the expanding module and the fixed-width module are symmetrically arranged, the distance between the two expanding modules is gradually expanded along the diaphragm running direction, the distance between the two fixed-width modules is also larger than the distance between the two film connecting modules, and the average speed of the transmission chain clamp at the expanding module is larger than the average speed of the transmission chain clamp at the film connecting module and smaller than the average speed of the transmission chain clamp at the fixed-width module.
Connect membrane module department be equipped with and connect membrane variable speed motor and connect the membrane driving medium, decide width of cloth module department and be equipped with the driving medium of deciding width of cloth this moment, connect membrane variable speed motor and drive the operation of circular orbit through connecting membrane driving medium and deciding width of cloth driving medium.
The fixed-amplitude module is provided with a fixed-amplitude variable speed motor and a fixed-amplitude transmission part, the fixed-amplitude variable speed motor drives the annular track to run through the fixed-amplitude transmission part, the membrane connecting module is provided with a membrane connecting transmission part, and the fixed-amplitude variable speed motor drives the annular track to run through the fixed-amplitude transmission part and the membrane connecting transmission part.
Connect membrane module department be equipped with connect membrane variable speed motor and connect the membrane driving medium, constant amplitude module department be equipped with constant amplitude variable speed motor and constant amplitude driving medium, connect membrane variable speed motor this moment and pass through constant amplitude driving medium and drive the circular orbit operation through connecting membrane driving medium and constant amplitude variable speed motor.
Connect the membrane module install connect membrane lead screw corresponding on, perhaps two connect membrane module to install on same connecing the membrane lead screw, connect the membrane lead screw to erect in the frame through the bearing and connect the outer end of membrane lead screw to install and connect the membrane hand wheel, two interval that connect between the membrane module are enlarged or are reduced through arbitrary membrane hand wheel adjustment, or connect the membrane hand wheel can synchronous adjustment two interval that connect between the membrane module through adjusting arbitrary membrane hand wheel.
The width expanding modules are arranged on corresponding width expanding lead screws, or the two width expanding modules are arranged on the same width expanding lead screw, the width expanding lead screws are erected on the rack through bearings, the outer ends of the width expanding lead screws are provided with width expanding hand wheels, the distance between the two width expanding modules is adjusted to be expanded or reduced through any width expanding hand wheel, and the distance between the two width expanding modules can be synchronously adjusted through adjusting any width expanding hand wheel.
The fixed-width modules are arranged on the fixed-width screws in one-to-one correspondence or the two fixed-width modules are arranged on the same fixed-width screw, the fixed-width screws are erected on the rack through bearings, fixed-width hand wheels are arranged at the outer ends of the fixed-width screws, and the distance between the two fixed-width modules is enlarged or reduced through adjustment of any fixed-width hand wheel or can be synchronously adjusted through adjustment of any fixed-width hand wheel.
The inboard tail end that connects the membrane module through outer convex part linking of expanding module, the inboard of expanding module links up the inboard top of decide width of cloth module through concave arc portion, and is inclined plane expanding portion between the inboard outer convex part of expanding module and the concave arc portion.
The use method of the stretching device comprises the following steps: two side edges of the unstretched diaphragm are respectively clamped by a transmission chain clamp at the inner side of the diaphragm connecting module; and starting a driving mechanism of the transmission chain clamp, wherein the transmission chain clamp drives the diaphragm to sequentially pass through the preheating zone, the stretching zone and the heat setting zone to perform transverse stretching and longitudinal stretching, the transverse stretching is realized by increasing the distance between the two expanding modules in the stretching zone, and the longitudinal stretching is realized by increasing the speed of the transmission chain clamp from the preheating zone to the heat setting zone.
Longitudinal stretching multiple speed T of the stretching device 1 Comprises the following steps: 1 < T 1 Transverse stretching speed T less than or equal to 10 2 Comprises the following steps: 1 < T 2 Less than or equal to 10 and T 2 ＜T 1 。
The temperature range of the oven in which the preheating zone is located is 100-150 ℃, the temperature range of the oven in which the stretching zone is located is 90-140 ℃, and the temperature range of the oven in which the heat setting zone is located is 90-150 ℃.
The diaphragm prepared by the stretching device has transverse tensile strength C not more than 190Mpa, longitudinal tensile strength D not less than 130Mpa, transverse elongation at break E not less than 60%, longitudinal elongation at break F not less than 60%, D/C more than 1, and E/F more than 1.5.
Compared with the prior art, the invention has the following advantages:
the stretching device realizes transverse stretching by changing the module interval, realizes longitudinal stretching by the speed difference of the operation of the transmission chain clamp, has controllable and adjustable stretching amplitude, and ensures that the longitudinal stretching strength of the prepared diaphragm is higher than the transverse stretching strength, the longitudinal elongation at break is lower than the transverse elongation at break, the thermal shrinkage in two directions is closer, so that the consistency is better, and the safety problem caused by the short circuit of the battery is effectively avoided.
Drawings
FIG. 1 is a schematic diagram of a basic structure of a stretching device of a high-safety wet-process synchronous lithium ion battery diaphragm;
FIG. 2 is a schematic structural diagram of an embodiment of a stretching device for a high-safety wet-process synchronous lithium ion battery separator according to the invention;
fig. 3 is a schematic operation diagram of the high-safety wet-process synchronous lithium ion battery separator stretching device.
Wherein: 1-a preheating zone; 10-connecting a membrane module; 11-connecting a film variable speed motor; 12-connecting a film transmission part; 13-connecting a membrane screw rod; 14, connecting a membrane hand wheel; 2-a stretching zone; 20-a spreading module; 23-a spreading screw; 24-expanding hand wheel; 3-a heat setting zone; 30-a fixed-width module; 31-fixed-width variable-speed motor; 32-fixed width transmission piece; 33-fixed-amplitude screw rod; 34-fixed width hand wheel; 4-circular orbit; 5, driving chain clamp; 6, a frame.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1-3: a high-safety wet-method synchronous lithium ion battery diaphragm stretching device comprises a film connecting module 10 located in a preheating area 1, an expanding module 20 located in a stretching area 2, and a fixed-width module 30 located in a heat setting area 3, wherein the inner side of the expanding module 20 is connected with the inner side tail end of the film connecting module 10 through an outer convex part, the inner side of the expanding module 20 is connected with the inner side initial end of the fixed-width module 30 through a concave arc part, and an inclined expanding part is arranged between the outer convex part and the concave arc part of the inner side of the expanding module 20, one group of film connecting module 10, the expanding module 20 and the fixed-width module 30 are connected by adopting the same annular rail 4, a transmission chain clamp 5 used for clamping the side edge of a battery diaphragm is arranged on the annular rail 4, the two groups of film connecting module 10, the expanding module 20 and the fixed-width module 30 are symmetrically arranged, the distance between the two expanding modules 20 is gradually expanded along the diaphragm running direction, the distance between the two fixed-width modules 30 is also larger than the distance between the two fixed-width modules 10, and the average speed of the transmission chain clamp 5 at the position of the expanding module 20 is larger than the average speed of the transmission chain clamp 5 at the chain clamp 5 and smaller than the fixed-width clamp 5 at the chain clamp position of the fixed-width module 5; the transverse stretching is achieved by increasing the distance between the two spreading modules 20 of the stretching zone 2 and the longitudinal stretching is achieved by increasing the speed of the drive chain gripper 5 from the preheating zone 1 to the heat-setting zone 3.
As for the driving of the endless track 4, there are the following three configurations:
the first structure is that a film-connecting variable speed motor 11 and a film-connecting transmission member 12 are arranged at the film-connecting module 10, a fixed-amplitude transmission member 32 is arranged at the fixed-amplitude module 30, and the film-connecting variable speed motor 11 drives the annular track 4 to run through the film-connecting transmission member 12 and the fixed-amplitude transmission member 32.
The second structure is that a fixed-width variable speed motor 31 and a fixed-width transmission member 32 are arranged at the fixed-width module 30, the fixed-width variable speed motor 31 drives the annular track 4 to run through the fixed-width transmission member 32, the film connecting transmission member 12 is arranged at the film connecting module 10, and the fixed-width variable speed motor 31 drives the annular track 4 to run through the fixed-width transmission member 32 and the film connecting transmission member 12.
The third structure is that a film connecting variable speed motor 11 and a film connecting transmission piece 12 are arranged at the position of the film connecting module 10, a fixed-amplitude variable speed motor 31 and a fixed-amplitude transmission piece 32 are arranged at the position of the fixed-amplitude module 30, and at the moment, the film connecting variable speed motor 11 drives the annular track 4 to run through the film connecting transmission piece 12 and the fixed-amplitude variable speed motor 31 through the fixed-amplitude transmission piece 32; the structure shown in fig. 1-3 is a third structure for a wipe.
Regarding the adjustment of the distance between the modules, the adjustment is usually performed by matching a lead screw and a hand wheel, and the difference is that one hand wheel adjusts one module (as shown in fig. 2) or one hand wheel simultaneously adjusts a pair of modules. For example: the membrane connecting modules 10 are arranged on corresponding membrane connecting lead screws 13, or the two membrane connecting modules 10 are arranged on the same membrane connecting lead screw 13, the membrane connecting lead screws 13 are erected on the frame 6 through bearings, membrane connecting hand wheels 14 are arranged at the outer ends of the membrane connecting lead screws 13, the distance between the two membrane connecting modules 10 is adjusted to be enlarged or reduced through any membrane connecting hand wheel 14, or the distance between the two membrane connecting modules 10 can be synchronously adjusted through adjusting any membrane connecting hand wheel 14; the expanding modules 20 are mounted on corresponding expanding lead screws 23, or the two expanding modules 20 are mounted on the same expanding lead screw 23, the expanding lead screws 23 are erected on the frame 6 through bearings, expanding hand wheels 24 are mounted at the outer ends of the expanding lead screws 23, the distance between the two expanding modules 20 is adjusted to be expanded or reduced through any one expanding hand wheel 24, and the distance between the two expanding modules 20 can be synchronously adjusted through adjusting any one expanding hand wheel 24; the fixed-width modules 30 are mounted on fixed-width lead screws 33 which correspond to each other one by one, or the two fixed-width modules 30 are mounted on the same fixed-width lead screw 33, the fixed-width lead screws 33 are erected on the frame 6 through bearings, fixed-width handwheels 34 are mounted at the outer ends of the fixed-width lead screws 33, and the distance between the two fixed-width modules 30 is adjusted to be enlarged or reduced through any fixed-width handwheel 34, or the distance between the two fixed-width modules 30 can be synchronously adjusted through any fixed-width handwheel 34.
The stretching device shown in fig. 1-2 is adopted, the operation schematic diagram of the stretching device is shown in fig. 3, and the using method of the stretching device is as follows: two sides of the unstretched diaphragm are respectively clamped by a transmission chain clamp 5 at the inner side of the film connecting module 10; starting a driving mechanism of the transmission chain clamp 5, wherein the transmission chain clamp 5 drives the diaphragm to sequentially pass through the preheating zone 1, the stretching zone 2 and the heat setting zone 3 for transverse stretching and longitudinal stretching, the transverse stretching is realized by increasing the distance between the two expanding modules 20 of the stretching zone 2, the speed of the transmission chain clamp 5 on the annular track 4 is faster and faster, and the distance between the adjacent transmission chain clamps 5 is larger and larger, so that the longitudinal stretching is realized, namely the longitudinal stretching is realized by increasing the speed of the transmission chain clamp 5 from the preheating zone 1 to the heat setting zone 3; the temperature range of the oven in which the preheating zone 1 is positioned is 100-150 ℃, the temperature range of the oven in which the stretching zone 2 is positioned is 90-140 ℃, and the temperature range of the oven in which the heat setting zone 3 is positioned is 90-150 ℃; the diaphragm prepared by the stretching device has transverse tensile strength C not more than 190MPa, longitudinal tensile strength D not less than 130MPa, transverse elongation at break E not less than 60%, longitudinal elongation at break F not less than 60%, D/C more than 1, and E/F more than 1.5.
The interpretation of the symbols in fig. 3 is: v 1 The linear speed of the film connecting variable speed motor 11 driving the film connecting transmission part 12 is shown, namely the linear speed of the film connecting variable speed motor 11 driving the transmission chain clamp 5 at the position; v 2 The linear speed of the fixed-width variable-speed motor 31 passing through the fixed-width transmission member 32 is shown, namely the linear speed of the fixed-width variable-speed motor 31 driving the transmission chain clamp 5 at the positionDegree; d 0 Represents the unstretched separator width; d 1 Representing the magnitude of the lateral stretching of the membrane in one side. Longitudinal stretching multiple speed T of the stretching device 1 Comprises the following steps: 1 < T 1 Transverse stretching speed T less than or equal to 10 2 Comprises the following steps: 1 < T 2 Less than or equal to 10, and then T 1 = V 2 / V 1 And T 2 =（D 1 *2+ D 0 ）/ D 0 . The longitudinal stretch ratio T is higher than the longitudinal stretch ratio T in order to ensure higher tensile strength and lower elongation at break in the longitudinal direction 1 Greater than transverse stretch ratio T 2 And T 2 ＜T 1 In the bidirectional stretching process, the longitudinal tension is generally greater than the transverse tension, and under the stretching multiple, the longitudinal and transverse thermal shrinkage of the stretched membrane is close to each other, so that the consistency is better.
The stretching device provided by the invention can simultaneously stretch in two directions under the same process condition, wherein the transverse stretching is realized by changing the width of the annular track, the longitudinal stretching is realized by the speed difference of the running of the driving chain clamp 5, the longitudinal tensile strength of the prepared diaphragm is higher relative to the transverse tensile strength, and the longitudinal breaking elongation is lower relative to the transverse breaking elongation.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (12)
1. The utility model provides a high security wet process synchronization lithium ion battery diaphragm's stretching device which characterized in that: the stretching device comprises a film connecting module (10) located in a preheating area (1), an expanding module (20) located in a stretching area (2), and a fixed-width module (30) located in a heat setting area (3), wherein the film connecting module (10), the expanding module (20) and the fixed-width module (30) are connected through a same annular track (4), a transmission chain clamp (5) used for clamping the side edge of a battery diaphragm is arranged on the annular track (4), the two groups of film connecting modules (10), the expanding module (20) and the fixed-width module (30) are symmetrically arranged, the distance between the two expanding modules (20) is gradually enlarged along the diaphragm running direction, and the average speed of the transmission chain clamp (5) at the expanding module (20) is greater than that of the transmission chain clamp (5) at the film connecting module (10) and is less than that of the transmission chain clamp (5) at the fixed-width module (30).
2. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 1, characterized in that: connect membrane module (10) department be equipped with connect membrane variable speed motor (11) and connect membrane driving medium (12), decide width of cloth module (30) department and be equipped with fixed width of cloth driving medium (32) this moment, connect membrane variable speed motor (11) to drive circular orbit (4) through connecting membrane driving medium (12) and fixed width of cloth driving medium (32) and move.
3. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 1, characterized in that: the fixed-amplitude module (30) is provided with a fixed-amplitude variable-speed motor (31) and a fixed-amplitude transmission piece (32), the fixed-amplitude variable-speed motor (31) drives the annular track (4) to run through the fixed-amplitude transmission piece (32), the film receiving module (10) is provided with a film receiving transmission piece (12), and the fixed-amplitude variable-speed motor (31) drives the annular track (4) to run through the fixed-amplitude transmission piece (32) and the film receiving transmission piece (12).
4. The high-safety stretching device for the wet-process synchronous lithium ion battery separator according to claim 1, characterized in that: connect membrane module (10) department be equipped with connect membrane variable speed motor (11) and connect membrane driving medium (12), decide width of cloth module (30) department be equipped with decide width of cloth variable speed motor (31) and decide width of cloth driving medium (32), connect membrane variable speed motor (11) this moment and pass through and connect membrane driving medium (12) and decide width of cloth variable speed motor (31) and drive circular orbit (4) operation through deciding width of cloth driving medium (32).
5. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 1, characterized in that: connect membrane module (10) install connect membrane lead screw (13) that correspond on, perhaps two connect membrane module (10) to install on same connect membrane lead screw (13), connect membrane lead screw (13) to erect in frame (6) through the bearing and connect the outer end of membrane lead screw (13) to install and connect membrane hand wheel (14), two interval that connect between membrane module (10) are enlarged or are reduced through arbitrary regulation that connects membrane hand wheel (14), perhaps connect membrane hand wheel (14) through adjusting arbitrary interval that connects between membrane module (10) can synchronous adjustment two interval that connect between membrane module (10).
6. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 1, characterized in that: the width expanding modules (20) are arranged on corresponding width expanding lead screws (23) or two width expanding modules (20) are arranged on the same width expanding lead screw (23), the width expanding lead screws (23) are erected on the frame (6) through bearings, the outer ends of the width expanding lead screws (23) are provided with width expanding hand wheels (24), the distance between the two width expanding modules (20) is adjusted to be expanded or reduced through any width expanding hand wheel (24), and the distance between the two width expanding modules (20) can be synchronously adjusted through adjusting any width expanding hand wheel (24).
7. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 1, characterized in that: the fixed-width modules (30) are arranged on fixed-width lead screws (33) in one-to-one correspondence, or the two fixed-width modules (30) are arranged on the same fixed-width lead screw (33), the fixed-width lead screws (33) are erected on the rack (6) through bearings, fixed-width hand wheels (34) are arranged at the outer ends of the fixed-width lead screws (33), and the distance between the two fixed-width modules (30) is adjusted to be enlarged or reduced through any fixed-width hand wheel (34), or the distance between the two fixed-width modules (30) can be synchronously adjusted through adjusting any fixed-width hand wheel (34).
8. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 1, characterized in that: the inboard of spreading module (20) is through the inboard tail end of outer convex part joggle joint membrane module (10), the inboard top that the inboard of spreading module (20) passes through concave arc portion joggle decide width of cloth module (30), and is inclined plane spreading portion between the inboard outer convex part of spreading module (20) and the concave arc portion.
9. The stretching device for the high-safety wet-process synchronous lithium ion battery separator according to any one of claims 1 to 8, characterized in that: the using method of the stretching device comprises the following steps: two side edges of the unstretched diaphragm are respectively clamped by a transmission chain clamp (5) at the inner side of the film connecting module (10); the driving mechanism of the transmission chain clamp (5) is started, the transmission chain clamp (5) drives the diaphragm to sequentially pass through the preheating zone (1), the stretching zone (2) and the heat setting zone (3) to perform transverse stretching and longitudinal stretching, wherein the transverse stretching is realized by increasing the distance between the two expanding modules (20) of the stretching zone (2), and the longitudinal stretching is realized by increasing the speed of the transmission chain clamp (5) from the preheating zone (1) to the heat setting zone (3).
10. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 9, characterized in that: longitudinal stretching multiple speed T of the stretching device 1 Comprises the following steps: 1 < T 1 Transverse stretching speed T less than or equal to 10 2 Comprises the following steps: 1 < T 2 Less than or equal to 10 and T 2 ＜T 1 。
11. The stretching device for the high-safety wet-process synchronous lithium ion battery separator according to claim 9, characterized in that: the temperature range of the oven in which the preheating zone (1) is located is 100-150 ℃, the temperature range of the oven in which the stretching zone (2) is located is 90-140 ℃, and the temperature range of the oven in which the heat setting zone (3) is located is 90-150 ℃.
12. The high-safety wet-process synchronous lithium ion battery separator stretching device according to claim 9, characterized in that: the diaphragm prepared by the stretching device has transverse tensile strength C not more than 190Mpa, longitudinal tensile strength D not less than 130Mpa, transverse elongation at break E not less than 60%, longitudinal elongation at break F not less than 60%, D/C more than 1, and E/F more than 1.5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116404354A (en) * | 2023-04-18 | 2023-07-07 | 南京贝迪新材料科技股份有限公司 | Extension device for preparing lithium battery diaphragm |
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| CN114228121A (en) * | 2022-02-24 | 2022-03-25 | 佛山市盟思拉伸机械有限公司 | Stretching device for improving synchronism of film at stretching initial section |
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