CN220052874U - Battery diaphragm stretching and shaping equipment and battery diaphragm production system - Google Patents
Battery diaphragm stretching and shaping equipment and battery diaphragm production system Download PDFInfo
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- CN220052874U CN220052874U CN202321324704.5U CN202321324704U CN220052874U CN 220052874 U CN220052874 U CN 220052874U CN 202321324704 U CN202321324704 U CN 202321324704U CN 220052874 U CN220052874 U CN 220052874U
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- 238000007493 shaping process Methods 0.000 title claims abstract description 87
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000010622 cold drawing Methods 0.000 claims description 58
- 238000001816 cooling Methods 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 18
- 238000001125 extrusion Methods 0.000 claims description 17
- 238000000137 annealing Methods 0.000 claims description 13
- 238000004513 sizing Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 7
- 239000012528 membrane Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 10
- 239000004743 Polypropylene Substances 0.000 description 9
- -1 polypropylene Polymers 0.000 description 9
- 229920001155 polypropylene Polymers 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 238000009998 heat setting Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a battery diaphragm stretching and shaping device and a battery diaphragm production system; the battery diaphragm stretching and shaping equipment comprises a stretching device, a shaping roller set and a baking device which are sequentially arranged, wherein the stretching device is used for stretching and forming holes on the diaphragm; the shaping roller set is used for performing heat shaping on the membrane subjected to the stretching pore-forming; the baking device is used for receiving the heat-set diaphragm and baking the diaphragm for the second time. According to the battery diaphragm stretching and shaping equipment disclosed by the utility model, under the condition of a certain total stretching multiplying power, the diaphragm is baked for the second time by adding the baking device after primary heat shaping, and the diaphragm with low heat shrinkage can be obtained without matching with a smaller shaping speed ratio, so that in the production process, a moderate heat pulling speed ratio can be adopted, and the diaphragm meeting the physicochemical characteristics of high air permeability and low heat shrinkage is obtained, so that the diaphragm has the characteristics of small self-discharge and good heat stability.
Description
Technical Field
The utility model relates to the field of battery diaphragm production equipment, in particular to battery diaphragm stretching and shaping equipment and a battery diaphragm production system.
Background
The battery separator is one of key materials of a secondary battery, for example, in a lithium ion battery, micropores in the battery separator can provide lithium ion transmission channels and can prevent positive and negative electrodes from being in contact with each other to generate short circuits, so that the energy density, safety performance, rate performance and other core performances of the battery are directly affected.
In the production process of the battery separator, the holes inside the battery separator are usually formed through the process steps of cold drawing, hot drawing and heat setting, and the stretching and setting during the production of the separator are realized through the speed difference between steel rolls under certain temperature conditions.
In the prior art, the total stretching multiplying power needs to be kept to be constant during stretching and shaping, if the production of the low-heat-shrinkage diaphragm is to be realized, a smaller shaping speed ratio needs to be matched, and at the moment, a larger heat-stretching speed ratio is needed, so that the diaphragm is finally caused to have low-ventilation physicochemical characteristics, and the self-discharge of a lithium battery product is influenced. The above problems are technical problems to be solved in the art.
Disclosure of Invention
The utility model provides a battery diaphragm stretching and shaping device and a battery diaphragm production system, which can be used for producing and preparing a battery diaphragm with low thermal shrinkage and high air permeability.
According to a first aspect, the utility model provides a battery diaphragm stretching and shaping device which is characterized by comprising a stretching device, a shaping roller set and a baking device which are sequentially arranged,
the stretching device is used for stretching the diaphragm to form a hole;
the shaping roller set is used for performing heat shaping on the membrane subjected to the stretching pore-forming;
the baking device is used for receiving the heat-set diaphragm and baking the diaphragm for the second time.
In an alternative embodiment, the stretching device comprises a cold drawing roller set and a hot drawing roller set which are sequentially arranged, wherein the cold drawing roller set is positioned at one side of the hot drawing roller set away from the shaping roller set; the cold drawing roller set is used for cold drawing the diaphragm; the hot drawing roll set is used for hot drawing the cold drawn diaphragm.
In an alternative embodiment, the cold-drawing roll set includes at least a first cold-drawing roll and a second cold-drawing roll, and a cold-drawing gap for passing the diaphragm is formed between the first cold-drawing roll and the second cold-drawing roll.
In an alternative embodiment, the hot drawing roll set includes at least a first hot drawing roll and a second hot drawing roll, and a hot drawing gap for passing the diaphragm is formed between the first hot drawing roll and the second hot drawing roll.
In an alternative embodiment, the shaping roller set includes at least a first shaping roller and a second shaping roller, and a shaping gap for passing the separator is formed between the first shaping roller and the second shaping roller.
In an alternative embodiment, the baking device comprises a baking oven, a supporting piece for supporting the diaphragm is arranged in the baking oven, a feeding hole and a discharging hole are respectively formed in two ends of the supporting piece, and the feeding hole is formed in one side, close to the shaping roller set, of the baking oven and used for receiving the diaphragm.
According to a second aspect, the utility model provides a battery separator production system, comprising the battery separator stretching and shaping device; and
and the extrusion molding equipment is arranged on one side of the stretching device, which is far away from the sizing roller group, and is used for melting and extruding the raw materials into the diaphragm.
In an alternative embodiment, the separator further comprises a cooling device, wherein the cooling device is arranged between the extrusion molding device and the stretching device and is used for cooling the separator extruded by the extrusion molding device.
In an alternative embodiment, an annealing device is further included, disposed between the cooling device and the stretching device, for annealing the separator extruded by the extrusion device.
In an alternative embodiment, the baking device further comprises a winding device, wherein the winding device is arranged on one side, away from the sizing roller group, of the baking device, and the winding device is used for winding the diaphragm subjected to the secondary baking.
The utility model has the beneficial effects that: according to the battery diaphragm stretching and shaping equipment disclosed by the utility model, under the condition of a certain total stretching multiplying power, the diaphragm is baked for the second time by adding the baking device after primary heat shaping, and the diaphragm with low heat shrinkage can be obtained without matching with a smaller shaping speed ratio, so that in the production process, a moderate heat pulling speed ratio can be adopted, and the diaphragm meeting the physicochemical characteristics of high air permeability and low heat shrinkage is obtained, so that the diaphragm has the characteristics of small self-discharge and good heat stability.
Drawings
FIG. 1 is an overall schematic diagram of a battery separator stretch forming apparatus in accordance with one embodiment of the present utility model;
fig. 2 is an overall schematic diagram of a battery separator production system in an embodiment of the present utility model.
Reference numerals: the drawing device 1, the cold drawing roll set 11, the first cold drawing roll 11a, the second cold drawing roll 11b, the hot drawing roll set 12, the first hot drawing roll 12a, the second hot drawing roll 12b, the shaping roll set 2, the first shaping roll 2a, the second shaping roll 2b, the baking device 3, the extrusion molding device 4, the winding device 5, the cooling device 6 and the annealing device 7.
Detailed Description
The utility model will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present utility model. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present utility model have not been shown or described in the specification in order to avoid obscuring the core portions of the present utility model, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
As shown in fig. 1, the utility model discloses a battery diaphragm stretching and shaping device, which comprises a stretching device 1, a shaping roller set 2 and a baking device 3 which are sequentially arranged, wherein the stretching device 1 is used for stretching and forming holes on a diaphragm; the shaping roller set 2 is used for performing heat shaping on the stretched and perforated diaphragm; the baking device 3 is used for receiving the heat-set diaphragm and baking the diaphragm for the second time.
In the embodiment disclosed in the present utility model, as shown in fig. 1, the stretching device 1 includes a cold drawing roll set 11 and a hot drawing roll set 12, which are sequentially arranged, wherein the cold drawing roll set 11 is located at one side of the hot drawing roll set 12 away from the shaping roll set 2; the cold drawing roller set 11 is used for cold drawing the diaphragm, a plurality of holes can be formed in the diaphragm through cold drawing the diaphragm, and then the cold drawn diaphragm is hot drawn through the hot drawing roller set 12 so as to ream the holes in the diaphragm.
In a more specific embodiment, as shown in fig. 1, the cold-drawing roller set 11 is at least composed of a first cold-drawing roller 11a and a second cold-drawing roller 11b, and a cold-drawing gap for passing through the diaphragm is formed between the first cold-drawing roller 11a and the second cold-drawing roller 11 b; for example, the first and second cold rolls 11a and 11b may be arranged side by side, and the separator may be wound around the first and second cold rolls 11a and 11b in an "S" shape and pass through the cold drawing gap during cold drawing; a certain rotational speed difference exists between the second cold-drawing roller 11b and the first cold-drawing roller 11a, and the separator can be cold-stretched by the rotational speed difference, and the ratio of the rotational speeds of the first cold-drawing roller 11a and the second cold-drawing roller 11b is referred to as a cold-drawing ratio.
In a more specific embodiment, as shown in fig. 1, the hot drawing roll set 12 is at least composed of a first hot drawing roll 12a and a second hot drawing roll 12b, and a hot drawing gap for passing through the diaphragm is formed between the first hot drawing roll 12a and the second hot drawing roll 12 b; for example, the first and second hot rolls 12a and 12b may be disposed in parallel, and a separator may be wound around the first and second hot rolls 12a and 12b in an "S" shape and pass through a hot drawing gap when hot drawing is performed; a certain rotational speed difference exists between the second hot pull roll 12b and the first hot pull roll 12a, and the separator is thermally stretched by the rotational speed difference, and the ratio of the rotational speeds of the first hot pull roll 12a and the second hot pull roll 12b is referred to as a hot pull ratio.
In a more specific embodiment, as shown in fig. 1, the shaping roller set 2 includes at least a first shaping roller 2a and a second shaping roller 2b, and a shaping gap for passing through the diaphragm is formed between the first shaping roller 2a and the second shaping roller 2 b; for example, the first and second shaping rolls 2a and 2b may be disposed side by side, and the separator may be wound around the first and second shaping rolls 2a and 2b in an "S" shape and pass through the shaping gap during the hot drawing process; there is a certain rotational speed difference between the second shaping roller 2b and the first shaping roller 2a, whereby the separator is shaped, and the ratio of the rotational speeds of the first shaping roller 2a and the second shaping roller 2b is called a shaping speed ratio.
It will be appreciated that the temperature of the first cold drawing roll 11a during drawing is lower than that of the first hot drawing roll 12a, and in order to adjust the first cold drawing roll 11a, the first hot drawing roll 12a, and the first shaping roll 2a to the proper drawing temperature, heating components are provided in each of the cold drawing roll set 11, the hot drawing roll set 12, and the shaping roll set 2 to heat the cold drawing roll set 11, the hot drawing roll set 12, and the shaping roll set 2; for example, the heating element may be an electromagnetic heating element or an electric resistance heating element, which is not limited in the present utility model, and the cold drawing roll set 11, the hot drawing roll set 12 and the shaping roll set 2 may be any one of the cold drawing roll set 11, the hot drawing roll set 12 and the shaping roll set 2 that are conventional in the art, and the heating element may be disposed in a conventional manner, and the present utility model is not limited in the present utility model.
In one embodiment, the baking apparatus 3 includes an oven, in which a supporting member is disposed to support the diaphragm, for example, the supporting member may be a supporting plate or a supporting roller, and the oven has a feed port and a discharge port at two ends of the supporting member, respectively, where the feed port is located on a side of the oven close to the shaping roller set 2 to receive the diaphragm passing through the first shaping roller 2a, and the diaphragm passing through the second baking may leave the oven through the discharge port.
After the diaphragm is stretched, the diaphragm is shaped once by utilizing a high-temperature shaping roller set 2, and then the diaphragm subjected to high-temperature shaping is sent to a baking device 3, and the diaphragm is baked twice by utilizing the baking device 3; through carrying out the secondary to the diaphragm and toasting, can effectually reduce the thermal contraction rate of diaphragm to, under the certain circumstances of total stretching ratio, can select suitable hot drawing ratio and design speed ratio to carry out the diaphragm production, with the diaphragm of preparing high ventilative, low thermal contraction, make the diaphragm of preparing have the characteristics that self-discharge is little, thermal stability is good.
The utility model further provides a battery diaphragm production system, as shown in fig. 2, which comprises the battery diaphragm stretching and shaping equipment and extrusion molding equipment 4, wherein the extrusion molding equipment 4 is arranged on one side of the stretching device 1, which is far away from the shaping roller set 2, and the extrusion molding equipment 4 is used for melting raw materials and extruding the raw materials to form diaphragm molding; for example, the extrusion molding apparatus 4 may be, but is not limited to, a casting extrusion molding apparatus.
In some alternative embodiments, as shown in fig. 2, the battery separator production system further includes a winding device 5 disposed on a side of the baking device 3 away from the sizing roller set 2, that is, the winding device 5 is close to a discharge port of the baking device 3; the winding device 5 is used for winding the diaphragm subjected to secondary baking, for example, the winding device 5 can be composed of a plurality of winding rollers and a motor for driving the winding rollers to rotate, and when the diaphragm is subjected to secondary baking, the diaphragm can be wound by the winding device 5.
In some embodiments, as shown in fig. 2, the above-described battery separator production system further includes a cooling device 6 and an annealing device 7; the extrusion molding equipment 4, the cooling equipment 6, the annealing equipment 7 and the battery diaphragm stretching and shaping equipment are sequentially arranged; wherein the cooling device 6 is used for enabling the extruded diaphragm to be rapidly cooled, the cooling device 6 is arranged between the extrusion molding device 4 and the annealing device 7, the cooling device 6 is used for cooling the diaphragm extruded by the extrusion molding device 4, for example, the cooling device 6 can be a cooling chamber or a cooling roller, and the utility model is not particularly limited thereto; the annealing device 7 may be an annealing oven, and after the extruded separator is cooled, the separator may be rolled up and transported to the annealing oven for annealing treatment.
In order to facilitate the explanation of the effects of the present utility model, the present utility model also provides the following specific examples of stretching and shaping the separator:
example 1
In this example, a 20 μm polypropylene separator is stretch-set, comprising the steps of:
step S1: cold stretching the diaphragm, and winding a polypropylene diaphragm with the width of 1000mm on the first cold drawing roller 11a and the second cold drawing roller 11b in an S shape; the rotation speed of the first cold drawing roller 11a is 1m/min, the rotation speed of the second cold drawing roller 11b is 1.2m/min, the speed difference between the first cold drawing roller 11a and the second cold drawing roller 11b is utilized to carry out cold drawing on the diaphragm, the cold drawing speed ratio is 1.2, and the cold drawing temperature is 60 ℃.
Step S2: hot stretching the diaphragm, and winding the cold stretched polypropylene diaphragm on the first hot drawing roller 12a and the second hot drawing roller 12b in an S shape; wherein, the rotation speed of the first hot drawing roller 12a is 1.2m/min, the rotation speed of the second hot drawing roller 12b is 2.11m/min, the polypropylene diaphragm is hot drawn by utilizing the speed difference of the first hot drawing roller 12a and the second hot drawing roller 12b, the hot drawing speed ratio is 1.8, and the hot drawing temperature is 140 ℃.
Step S3: performing primary heat setting on the diaphragm, and winding the polypropylene diaphragm subjected to heat stretching on the first setting roller 2a and the second setting roller 2b in an S shape; wherein, the rotational speeds of the first shaping roller 2a and the second shaping roller 2b are 2.11m/min, the shaping speed ratio is 1, and the shaping temperature is 150 ℃.
Step S4: secondary baking the diaphragm: and (3) feeding the polypropylene diaphragm subjected to primary heat setting into a baking device 3, wherein the conveying speed of the polypropylene diaphragm in the baking device 3 is 2.11m/min, and the baking temperature is 150 ℃.
Comparative example 1
The polypropylene separator of 20 μm was stretch-set with reference to the methods and parameters of steps S1 to S3 in example 1, except that the separator was not subjected to secondary baking in this comparative example.
Comparative example 2
The polypropylene separator of 20 μm was stretch-set by the method of steps S1 to S3 in example 1.
The difference is that in this comparative example, the hot pull ratio of step S3 is 2.2, and the set ratio of step S4 is 0.8; and this comparative example did not perform secondary baking on the separator.
Each performance of the above example 1, comparative example 1 and comparative example 2 was tested; the thickness of the stretched diaphragm is tested according to the thickness measuring method specified in GB/T6672-2001; the air permeability value is tested according to the air permeability measuring method specified in GB/T36363-2018; heat shrinkage the heat shrinkage of the separator in the MD direction was tested by heating at 130 c for 0.5h according to the procedure specified in GB/T12027-2004. The specific test results are shown in table 1:
TABLE 1
| Project | Example 1 | Comparative example 1 | Comparative example 2 |
| Cold drawing speed ratio/cold drawing temperature | 1.2/60℃ | 1.2/60℃ | 1.2/60℃ |
| Ratio of hot pull/hot pull temperature | 1.8/140℃ | 1.8/140℃ | 2.2/140℃ |
| Setting speed ratio/heat setting temperature | 1/150℃ | 1/150℃ | 0.8/150℃ |
| Total ratio of stretching | 2.1 | 2.1 | 2.1 |
| Thickness (after stretching) | 18um | 18um | 18um |
| Ventilation value | 280s/100ml | 280s/100ml | 230s/100ml |
| MD heat shrinkage | 3.0 | 5.0 | 3.0 |
As can be seen from table 1, the total stretch ratio was the same in each of example 1, comparative example 1 and comparative example 2. Comparing example 1 with comparative example 1, in the case where the secondary baking was canceled as compared with example 1 and the remaining process parameters were the same, the heat shrinkability of comparative example 1 exhibited a large difference from that of example 1, and example 1 was able to effectively improve the heat shrinkability by the secondary baking.
As can be seen from the comparison of example 1 and comparative example 2, comparative example 2 was improved in heat resistance by adjusting the hot drawing ratio and reducing the setting ratio while maintaining the total drawing ratio, but it was required to perform at an extremely low setting ratio, and on the other hand, comparative example 2 was significantly inferior in air permeability to the separator provided in example 1.
In summary, according to the battery diaphragm stretching and shaping equipment disclosed by the utility model, under the condition of a certain total stretching multiplying power, the baking device 3 is added to bake the diaphragm for the second time after primary heat shaping, and the diaphragm with low heat shrinkage can be obtained without matching with a smaller shaping speed ratio, so that in the production process, a moderate heat pulling speed ratio can be adopted, and the diaphragm meeting the physicochemical characteristics of high air permeability and low heat shrinkage can be obtained, so that the diaphragm has the characteristics of small self-discharge and good heat stability.
The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.
Claims (9)
1. A battery diaphragm stretching and shaping device is characterized by comprising a stretching device, a shaping roller set and a baking device which are sequentially arranged,
the stretching device comprises a cold drawing roller set and a hot drawing roller set which are sequentially arranged, and is used for stretching and forming holes on the diaphragm;
the shaping roller set at least comprises a first shaping roller and a second shaping roller, a shaping gap for a diaphragm to pass through is formed between the first shaping roller and the second shaping roller, and the shaping roller set is used for carrying out heat shaping on the diaphragm which is subjected to the stretching pore-forming;
the baking device is used for receiving the heat-set diaphragm and baking the diaphragm for the second time.
2. The battery separator stretch-sizing apparatus of claim 1, wherein the cold pull roll set is located on a side of the hot pull roll set remote from the sizing roll set; the cold drawing roller set is used for cold drawing the diaphragm; the hot drawing roll set is used for hot drawing the cold drawn diaphragm.
3. The battery separator stretching and shaping apparatus as set forth in claim 2, wherein said set of cold-drawing rolls comprises at least a first cold-drawing roll and a second cold-drawing roll, and a cold-drawing gap for passing a separator is formed between said first cold-drawing roll and said second cold-drawing roll.
4. The battery separator stretching and shaping apparatus as set forth in claim 2, wherein said set of heat-drawing rollers comprises at least a first heat-drawing roller and a second heat-drawing roller, and a heat-drawing gap for passing a separator is formed between said first heat-drawing roller and said second heat-drawing roller.
5. The battery separator stretching and shaping device according to any one of claims 1 to 4, wherein the baking device comprises an oven, a supporting member for supporting the separator is arranged in the oven, two ends of the oven, which are positioned on the supporting member, are respectively provided with a feed inlet and a discharge outlet, and the feed inlet is positioned on one side, close to the shaping roller group, of the oven, and is used for receiving the separator.
6. A battery separator production system comprising the battery separator stretch-shaping apparatus according to any one of claims 1 to 5; and
and the extrusion molding equipment is arranged on one side of the stretching device, which is far away from the sizing roller group, and is used for melting and extruding the raw materials into the diaphragm.
7. The battery separator production system of claim 6, further comprising a cooling device disposed between the extrusion molding device and the stretching device, the cooling device for cooling the separator extruded by the extrusion molding device.
8. The battery separator production system of claim 7, further comprising an annealing device disposed between the cooling device and the stretching device, the annealing device for annealing the separator extruded by the extrusion molding device.
9. The battery separator production system of claim 8, further comprising a winding device disposed on a side of the baking device remote from the sizing roller set, the winding device being configured to wind up the secondarily baked separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321324704.5U CN220052874U (en) | 2023-05-24 | 2023-05-24 | Battery diaphragm stretching and shaping equipment and battery diaphragm production system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321324704.5U CN220052874U (en) | 2023-05-24 | 2023-05-24 | Battery diaphragm stretching and shaping equipment and battery diaphragm production system |
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| Publication Number | Publication Date |
|---|---|
| CN220052874U true CN220052874U (en) | 2023-11-21 |
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|---|---|---|---|
| CN202321324704.5U Active CN220052874U (en) | 2023-05-24 | 2023-05-24 | Battery diaphragm stretching and shaping equipment and battery diaphragm production system |
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| Country | Link |
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| CN (1) | CN220052874U (en) |
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2023
- 2023-05-24 CN CN202321324704.5U patent/CN220052874U/en active Active
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