CN114393088A - Aluminum-plastic film pit punching die and pit punching method thereof - Google Patents
Aluminum-plastic film pit punching die and pit punching method thereof Download PDFInfo
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- CN114393088A CN114393088A CN202111665605.9A CN202111665605A CN114393088A CN 114393088 A CN114393088 A CN 114393088A CN 202111665605 A CN202111665605 A CN 202111665605A CN 114393088 A CN114393088 A CN 114393088A
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- 239000002985 plastic film Substances 0.000 title claims abstract description 191
- 229920006255 plastic film Polymers 0.000 title claims abstract description 191
- 238000004080 punching Methods 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 69
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 59
- 210000001503 joint Anatomy 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 24
- 238000003825 pressing Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 16
- 239000012528 membrane Substances 0.000 description 11
- 230000007246 mechanism Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003571 electronic cigarette Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001447 compensatory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/04—Stamping using rigid devices or tools for dimpling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
- B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention provides an aluminum-plastic film pit punching die and a pit punching method thereof, wherein the aluminum-plastic film pit punching die comprises an upper template and a lower template, an aluminum-plastic film pit punching quantitative compensation assembly is arranged between the upper template and the lower template, a male die is arranged on the lower template, a female die matched with the male die is arranged on the upper template, and pit punching molding is carried out on an aluminum-plastic film through the matching of the male die and the female die; the punch is characterized in that the surface of one side, close to the female die, of the male die is a punching end face, the vertex angle of the male die is a spherical surface, the edge of the male die is an arc surface, the radius of the edge is smaller than that of the vertex angle, the edge is in butt joint with the vertex angle through a variable-diameter arc surface section, and the radius of the arc surface section is gradually increased from the edge to the vertex angle. The aluminum-plastic film pit punching die provided by the invention is suitable for thick cells, and realizes the improvement of pit punching quality of aluminum-plastic films of the thick cells and the thickness of angular aluminum layers.
Description
Technical Field
The invention belongs to the technical field of lithium ion power battery production, and particularly relates to an aluminum plastic film pit punching die and a pit punching method thereof.
Background
With the development of lithium ion power batteries towards high volume and high quality energy density, the development of thick cells is more and more important, in order to ensure the high temperature and high humidity storage and safety performance of the batteries, the quality requirement on the punching of pits of an aluminum-plastic film is higher and higher, the requirement on the depth of the punched pits is higher, the damage to the aluminum-plastic film in the process of punching the pits is required to be smaller, and the requirement on the thickness of an aluminum layer at an angular position of the aluminum-plastic film after the pits are punched is higher and higher.
At present, the commonly used method for improving the pit punching quality and the angular aluminum layer thickness of the aluminum-plastic film comprises the steps of additionally arranging a preheating system and a hot pit punching system, and additionally arranging an aluminum-plastic film quantitative compensation mechanism. Wherein, preheat the system and mainly adopt the mode of electrical heating or oil heating with hot dashing the hole system, preheat the structure of system complicated to it is higher to the control by temperature change requirement of preheating the system. And add aluminium-plastic film ration compensation mechanism, produce easily because of the aluminium-plastic film slip process running roller supports the uneven problem such as fold and pit of aluminium-plastic film angular position after the pit dashes that causes of pressure.
CN103386695A discloses an aluminium-plastic film dashes hole mould with compensation function, aluminium-plastic film dashes hole mould includes the lower mould that is equipped with terrace die and lower bolster, is equipped with the last mould of die and cope match-plate pattern, is equipped with aluminium-plastic film ration compensation mechanism between cope match-plate pattern and lower bolster, and aluminium-plastic film ration compensation mechanism is controlled by the controller that is equipped with microprocessor. This mould changes the fixed pressing mode of plastic-aluminum membrane into the pressing mode that floats and enables the plastic-aluminum membrane slide in order to prevent to drag too big and play the effect of material compensation of power, but can't solve the running roller and support the uneven aluminium-plastic membrane angular position fold and pit scheduling problem that causes to dash behind the hole of pressure.
CN203712788U discloses a hot stamping and stretching die for an aluminum-plastic film, which comprises a support frame, a concave bottom die, a flat plate die and an independent motion die, wherein the flat plate die is mounted on the support frame above the concave bottom die, a through hole is formed in the flat plate die, a slide rail is arranged on the through hole, and the independent motion die is mounted in the through hole through the slide rail; and heating pipes are arranged on one sides of the contact surfaces of the aluminum plastic films of the concave bottom die, the flat die and the independent motion die, and are connected with a temperature control system. The mould adopts a hot stamping means to solve the problem that the aluminium-plastic film is broken or damaged and cannot be used due to rigid stretching, but the structure is more complex and the thickness of the angular aluminum layer cannot be increased.
CN103872267A discloses a flexible package lithium ion battery and a stamping die for an aluminum-plastic film casing thereof, wherein the aluminum-plastic film stamping die comprises an upper stamping die and a lower stamping die, a stamping die head is mounted on the lower stamping die, a die pit corresponding to the stamping die head on the lower stamping die is arranged on the upper stamping die, the stamping plane of the stamping die head is rectangular, and the die pit corresponding to the stamping die head is rectangular; the transition part of the stamping plane and the side vertical surface of the stamping die head is in arc transition with a rounded corner. The die design can not meet the requirement of the thickness of the angular aluminum layer under the deep hole punching of the thick battery core.
Therefore, the aluminum-plastic film pit punching die with the simple structure is developed, the problems of coiling, breaking, corner folding and pit punching of the aluminum-plastic film after pit punching can be solved, meanwhile, the thickness of the corner aluminum layer of the aluminum-plastic film and the pit punching depth are improved, and the punching quality of the aluminum-plastic film with the thick cell is very important for further improving.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an aluminum-plastic film pit punching die and a pit punching method thereof, and by optimizing the end face structure of a male die and arranging an aluminum-plastic film pit punching quantitative compensation assembly, the problems of coiling, cracking, angular position wrinkles, pits and the like after the aluminum-plastic film is punched can be solved, and meanwhile, the angular position aluminum layer thickness and the pit punching depth of the aluminum-plastic film are further improved, so that the aluminum-plastic film pit punching die provided by the invention is suitable for a thick electric core, and the pit punching quality of the aluminum-plastic film of the thick electric core and the angular position aluminum layer thickness are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an aluminum-plastic film pit punching die which comprises an upper die plate and a lower die plate, wherein an aluminum-plastic film pit punching quantitative compensation assembly is arranged between the upper die plate and the lower die plate, a male die is mounted on the lower die plate, a female die matched with the male die is arranged on the upper die plate, and pit punching forming is carried out on an aluminum-plastic film through matching of the male die and the female die.
The punch is characterized in that the surface of one side, close to the female die, of the male die is a punching end face, the vertex angle of the male die is a spherical surface, the edge of the male die is an arc surface, the radius of the edge is smaller than that of the vertex angle, the edge is in butt joint with the vertex angle through a variable-diameter arc surface section, and the radius of the arc surface section is gradually increased from the edge to the vertex angle.
According to the invention, the structures of the top angle and the edge of the male die are optimized, so that the thickness extension of the aluminum layer of the top angle and the edge of the male die in the pit punching process is effectively reduced, the cracking of an aluminum-plastic film in the pit punching process is prevented, and the thickness of the aluminum layer at the corner of the aluminum-plastic film is improved; through setting up the plastic-aluminum membrane and dashing hole ration compensation subassembly, both can suppress the plastic-aluminum membrane with the location, make the plastic-aluminum membrane to carry out appropriate slip again to extending the compensation to the angle position aluminium lamination of plastic-aluminum membrane towards the hole in-process, further preventing to dash the fracture of hole in-process plastic-aluminum membrane, improve plastic-aluminum membrane angle position aluminium lamination thickness, and solve towards hole back plastic-aluminum membrane angle position fold and pit scheduling problem.
According to the aluminum-plastic film pit punching mold provided by the invention, through the synergistic effect of optimizing the end surface structure of the male mold and setting the aluminum-plastic film pit punching quantitative compensation assembly, the problems of coiling, cracking, angular position wrinkles, pits and the like after the aluminum-plastic film pit punching are solved, and meanwhile, the angular position aluminum layer thickness and the pit punching depth of the aluminum-plastic film are further improved, so that the aluminum-plastic film pit punching mold provided by the invention is suitable for a thick electric core, and the pit punching quality of the aluminum-plastic film of the thick electric core and the angular position aluminum layer thickness are improved.
In a preferred embodiment of the present invention, the radius of the apex angle is 1.8 to 2.3mm, and may be, for example, 1.8mm, 1.85mm, 1.9mm, 1.95mm, 2mm, 2.05mm, 2.1mm, 2.15mm, 2.2mm, 2.25mm or 2.3mm, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range of values are also applicable.
In a preferred embodiment of the present invention, the edge has a radius of 1.3 to 1.8mm, and may be, for example, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm or 1.8mm, but not limited to the above-mentioned values, and other values not listed in the above-mentioned range of values are also applicable.
In the invention, the radius of one end of the cambered surface section close to the vertex angle is the same as that of the vertex angle, and the radius of one end of the cambered surface section close to the seamed edge is the same as that of the seamed edge.
Preferably, the length of the arc segment in the direction of the edge is 2-5 mm, for example, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, but is not limited to the values listed, and other values not listed in the range of values are also applicable.
As a preferable technical scheme, the aluminum-plastic film pit punching quantitative compensation assembly comprises a driving roller pair and a driven roller pair, and the aluminum-plastic film penetrates through the driving roller pair and the driven roller pair.
In the invention, the driving roller wheel pair and the driven roller wheel pair are respectively formed by pressing rollers arranged on the upper template and the lower template.
As a preferable technical solution of the present invention, the aluminum-plastic film pit-punching quantitative compensation assembly further includes a pressure sensor.
Preferably, the aluminum-plastic film pit punching quantitative compensation assembly further comprises a pressure controller arranged on the lower template, and the pressure controller adjusts the pressing force of the driving roller pair and the driven roller pair on the aluminum-plastic film after receiving the signal of the pressure sensor.
According to the invention, the aluminum-plastic film pit punching quantitative compensation mechanism with the pressure sensor is additionally arranged between the upper template and the lower template, and the pressing strength of the pressing roller pair between the upper template and the lower template on the aluminum-plastic film can be fed back to the pressure controller through the pressure sensor in the pit punching process, so that the pressing strength of the pressing roller pair on the aluminum-plastic film can be adjusted in real time, the compensatory pit punching of the aluminum-plastic film is realized, and the problems of fold, pit and the like of the aluminum-plastic film at the corner position after pit punching are solved.
As a preferable technical scheme of the invention, the aluminum-plastic film pit punching die further comprises a preheating assembly, and the aluminum-plastic film is preheated by the preheating assembly and then subjected to pit punching forming.
Preferably, the preheating assembly comprises a heating source and a temperature sensor, and the temperature sensor is used for monitoring the temperature of the surface of the aluminum plastic film.
Preferably, the heating source comprises an LED lamp.
According to the invention, the preheating assembly is adopted to heat the aluminum-plastic film before the punching of the aluminum-plastic film, the preheating assembly has a simple structure, low power consumption and no infrared ray or ultraviolet ray, the yield stress of the aluminum layer is effectively reduced, the plasticity of the aluminum-plastic film is improved, the aluminum-plastic film can be prevented from being coiled after the punching of the pit, the aluminum-plastic film is prevented from being cracked after the punching of the pit, and the thickness of the angular aluminum layer is improved. In addition, add temperature sensor in preheating the subassembly, carry out real-time supervision to the temperature on plastic-aluminum membrane surface. The LED lamp adopts an electronic cigarette type LED lamp.
As a preferable technical scheme of the invention, the bottom of the female die is provided with a stripper plate.
In the invention, the stripping plate enables the aluminum-plastic film formed by punching the pits to be separated from the aluminum-plastic film pit punching die.
In a second aspect, the present invention provides a method for punching a pit of the aluminum-plastic film punching mold of the first aspect, where the method for punching a pit includes:
and placing the aluminum-plastic film between the upper template and the lower template, wherein the upper template moves towards the lower template, so that the male die is embedded in the female die to drive the aluminum-plastic film to deform, and the aluminum-plastic film is subjected to pit punching forming.
In the pit punching forming process, the aluminum-plastic film slides through the pit punching quantitative compensation assembly of the aluminum-plastic film, and the extension of the angular aluminum layer of the aluminum-plastic film is compensated.
As a preferable technical solution of the present invention, the pit punching method further includes:
and preheating the aluminum-plastic film before pit punching and forming of the aluminum-plastic film.
Preferably, the temperature of the pre-heat treatment is 35 to 55 ℃, for example, 35 ℃, 38 ℃, 40 ℃, 42 ℃, 45 ℃, 48 ℃, 50 ℃, 52 ℃ or 55 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
As a preferable technical solution of the present invention, the pit punching method further includes:
and in the pit punching forming process, the pressing force of the driving roller pair and the driven roller pair on the aluminum-plastic film is adjusted through the pit punching quantitative compensation assembly for the aluminum-plastic film.
Preferably, the pressing force is 30 to 50kg, and may be, for example, 30kg, 32kg, 34kg, 36kg, 38kg, 40kg, 42kg, 44kg, 46kg, 48kg or 50kg, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
Illustratively, the aluminum-plastic film pit punching die provided by the invention can be used for punching and forming an aluminum-plastic film which is prepared by a dry process and has the width of 530 +/-10 mm, the thickness of 152 +/-10 um and the thickness of 40 +/-10 um, wherein the pit punching depth is 7.5 +/-0.5 mm, the inner pit size is (99.5 +/-0.5) × (498.5 +/-0.5) mm, and the outer pit size is (101.5 +/-0.5) × (500.5 +/-0.5) mm.
Compared with the prior art, the invention has the beneficial effects that:
according to the aluminum plastic film pit punching mold provided by the invention, through combining three improvement measures of optimizing the top angle and edge structure of the male mold, additionally arranging an aluminum plastic film pit punching quantitative compensation assembly with a pressure sensor and additionally arranging a preheating assembly, the problems of coiling, cracking, angular position wrinkles, pits and the like after the aluminum plastic film pit punching are solved, and meanwhile, the angular position aluminum layer thickness and pit punching depth of the aluminum plastic film are further improved, so that the aluminum plastic film pit punching mold provided by the invention is suitable for a thick battery cell, and the pit punching quality and angular position aluminum layer thickness of the aluminum plastic film of the thick battery cell are improved.
Drawings
Fig. 1 is a schematic structural diagram of an aluminum-plastic film pit punching mold according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a male mold of an aluminum-plastic film pit punching mold according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a top angle and an edge of a male die of a pit punching die for an aluminum-plastic film according to an embodiment of the present invention.
Wherein, 1, an upper template; 2-a lower template; 3-a male die; 4-a female die; 5-driving roller pair; 6-driven roller pair; 7-an aluminum plastic film; 8-a pressure sensor; 9-a pressure controller; 10-a heating source; 11-a temperature sensor; 12-a stripper plate; 13-punching the end face; 14-edge; 15-apex angle.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In a specific embodiment, the invention provides an aluminum-plastic film pit punching die, as shown in fig. 1, the aluminum-plastic film pit punching die comprises an upper die plate 1 and a lower die plate 2, an aluminum-plastic film pit punching quantitative compensation assembly is arranged between the upper die plate 1 and the lower die plate 2, a male die 3 is mounted on the lower die plate 2, a female die 4 matched with the male die 3 is arranged on the upper die plate 1, and pit punching molding is performed on an aluminum-plastic film 7 through matching of the male die 3 and the female die 4.
As shown in fig. 2 and 3, a stamping end face 13 is arranged on one side surface of the punch 3 close to the die 4, a vertex angle 15 of the punch 3 is a spherical surface, an edge 14 of the punch 3 is an arc surface, the radius of the edge 14 is smaller than that of the vertex angle 15, the edge 14 is in butt joint with the vertex angle 15 through a variable-diameter arc surface section, and the radius of the arc surface section is gradually increased from the edge 14 to the vertex angle 15.
In the invention, the radius of one end of the arc-shaped section close to the vertex angle 15 is the same as that of the vertex angle 15, and the radius of one end of the arc-shaped section close to the edge 14 is the same as that of the edge 14.
Further, the aluminum-plastic film pit punching quantitative compensation assembly comprises a driving roller pair 5 and a driven roller pair 6, and the aluminum-plastic film 7 penetrates through the driving roller pair 5 and the driven roller pair 6. In the invention, the driving roller pair 5 and the driven roller pair 6 are respectively formed by pressing rollers arranged on the upper template 1 and the lower template 2.
Further, the aluminum-plastic film pit punching quantitative compensation assembly further comprises a pressure sensor 8; furthermore, the aluminum-plastic film pit punching quantitative compensation assembly further comprises a pressure controller 9 arranged on the lower template 2, and the pressure controller 9 adjusts the floating pressing force of the aluminum-plastic film 7 after receiving the signal of the pressure sensor 8.
Further, the aluminum-plastic film pit punching die further comprises a preheating assembly, and the aluminum-plastic film 7 is preheated by the preheating assembly and then subjected to pit punching forming; the preheating assembly comprises a heating source 10 and a temperature sensor 11, wherein the temperature sensor 11 is used for monitoring the temperature of the surface of the aluminum plastic film 7; the heating source 10 includes an LED lamp. The LED lamp adopts an electronic cigarette type LED lamp.
Further, a stripper plate 12 is arranged at the bottom of the female die 4, and the stripper plate 12 enables the aluminum-plastic film 7 formed by punching the pit to be separated from the aluminum-plastic film pit punching die.
Examples1
Based on the above specific embodiment, this embodiment provides an aluminum-plastic film pit punching mold, the radius of the vertex angle 15 of the male mold 3 is 1.9mm, the radius of the edge 14 of the male mold 3 is 1.5mm, the length of the reducing arc surface section butted between the vertex angle 15 and the edge 14 is 3mm, and the radius of the reducing arc surface section is gradually increased from 1.5mm to 1.9mm from the edge 14 to the vertex angle 15;
based on the aluminum-plastic film pit punching die provided by the invention, the embodiment also provides a pit punching method, and the pit punching method comprises the following steps:
preheating an aluminum-plastic film 7 with the width of 530mm, the thickness of the aluminum-plastic film 7 of 152 microns and the thickness of an aluminum layer of 40 microns at the temperature of 35 ℃, enabling the preheated aluminum-plastic film 7 to pass through a driving roller pair 5 and a driven roller pair 6 in an aluminum-plastic film pit punching quantitative compensation assembly to reach a position between an upper template 1 and a lower template 2, and punching pit forming on aluminum-plastic aluminum through the matching of a male die 3 and a female die 4; in the pit punching forming process, the aluminum-plastic film 7 properly slides through the aluminum-plastic film pit punching quantitative compensation assembly to compensate the extension of the angular aluminum layer of the aluminum-plastic film 7, and the pressing force applied to the aluminum-plastic film 7 by the driving roller pair 5 and the driven roller pair 6 is adjusted in real time through a pressure sensor 8 and a pressure controller 9 in the aluminum-plastic film pit punching quantitative compensation assembly, wherein the adjustment range of the pressing force is 40-50 kg; after the pit punching is finished, the aluminum-plastic film 7 molded by the pit punching is separated from the aluminum-plastic film pit punching die through the stripper plate 12;
in this embodiment, the depth of the punched pits of the aluminum-plastic film 7 is 7.5mm, the size of the inner pits is 99.5 × 498.5mm, and the size of the outer pits is 101.5 × 500.5 mm.
Examples2
This example differs from example 1 in that aluminum plastic film 7 is preheated at 55 ℃ before being subjected to crater punching, and the rest of the process parameters and the operation steps are the same as those of example 1.
Examples3
The difference between the embodiment and the embodiment 1 is that the adjustment range of the pressing force is 30-50 kg in the pit punching forming process of the aluminum-plastic film 7, and the rest of the process parameters and the operation steps are the same as those in the embodiment 1.
Examples4
The difference between the embodiment and the embodiment 1 is that the radius of a vertex angle 15 of a male die 3 in the aluminum plastic film pit punching die is 2.3mm, the radius of an edge 14 of the male die 3 is 1.8mm, the length of a reducing arc surface section butted between the vertex angle 15 and the edge 14 is 2mm, and the radius of the reducing arc surface section is gradually increased from 1.8mm to 2.3mm from the edge 14 to the vertex angle 15; the remaining process parameters and operating steps were the same as in example 1.
Examples5
The difference between the embodiment and the embodiment 1 is that the radius of a vertex angle 15 of a male die 3 in the aluminum plastic film pit punching die is 1.8mm, the radius of an edge 14 of the male die 3 is 1.3mm, the length of a reducing arc surface section butted between the vertex angle 15 and the edge 14 is 5mm, and the radius of the reducing arc surface section is gradually increased from 1.3mm to 1.8mm from the edge 14 to the vertex angle 15; the remaining process parameters and operating steps were the same as in example 1.
Examples6
This example differs from example 1 in that the preheating process is omitted and the remaining process parameters and operating steps are the same as in example 1.
Comparative example1
The difference between the comparative example and the example 1 is that the arrangement of the variable-diameter cambered surface section of the male die 3 in the aluminum plastic film pit punching die is omitted, namely, the vertex angle 15 and the edge 14 are directly butted; the remaining process parameters and operating steps were the same as in example 1.
Comparative example2
The difference between the comparative example and the example 1 is that the arrangement of a pit punching quantitative compensation component of the aluminum-plastic film 7 in the pit punching die of the aluminum-plastic film is omitted; the remaining process parameters and operating steps were the same as in example 1.
Comparative example3
The comparative example provides a conventional aluminum-plastic film pit punching die, which comprises an upper template 1 and a lower template 2, wherein the lower template 2 is provided with a male die 3, and the upper template 1 is provided with a female die 4 matched with the male die 3; the surface of one side, close to the female die 4, of the male die 3 is a stamping end face 13, a vertex angle 15 and an edge 14 of the male die 3 are both set to be in cambered surface transition, wherein the radius of the vertex angle 15 is 4mm, and the radius of the edge 14 is 2 mm; the bottom of the female die 4 is provided with a stripper plate 12, and the stripper plate 12 enables the pit-punching formed aluminum-plastic film 7 to be separated from the pit-punching die of the aluminum-plastic film 7;
based on the conventional aluminum-plastic film pit punching die provided by the comparative example, the comparative example also provides a pit punching method, and the pit punching method comprises the following steps:
placing the normal-temperature aluminum-plastic film 7 with the width of 530mm, the thickness of the aluminum-plastic film 7 of 152 microns and the thickness of the aluminum layer of 40 microns between the upper template 1 and the lower template 2, and performing pit punching molding on the aluminum-plastic aluminum through the matching of the male die 3 and the female die 4; in the pit punching forming process, the pressing force applied to the aluminum-plastic film 7 is 40 kg; after the pit punching is finished, the aluminum-plastic film 7 molded by the pit punching is separated from the aluminum-plastic film pit punching die through the stripper plate 12;
in this embodiment, the depth of the punched pits of the aluminum-plastic film 7 is 7.5mm, the size of the inner pits is 99.5 × 498.5mm, and the size of the outer pits is 101.5 × 500.5 mm.
The results of the tests on the thickness of the aluminum layer at the corner of the aluminum-plastic film after punching in examples 1-6 and comparative examples 1-3 are shown in Table 1.
TABLE 1
From the data of table 1, one can see:
(1) in embodiments 1 to 5, the thicknesses of the aluminum layer at the 7-corner position of the aluminum-plastic film after pit punching are both large, and the residual amount of aluminum at the 7-corner position of the aluminum-plastic film is large, which indicates that the thickness of the aluminum layer at the 7-corner position of the aluminum-plastic film can be significantly increased by combining three improvement measures of optimizing the structures of the vertex angle 15 and the edge 14 of the punch 3, adding the aluminum-plastic film pit punching quantitative compensation component with the pressure sensor 8, and adding the preheating component, so that the pit punching quality of the aluminum-plastic film 7 with the thick cell and the thickness of the aluminum layer at the corner position can be improved.
(2) The aluminum residue of the aluminum-plastic film at the 7-corner aluminum layer and the plastic film at the corner in the embodiment 6 is lower than that of the embodiment 1, because the preheating treatment process is omitted in the embodiment 6, the plastic property of the aluminum-plastic film 7 cannot be improved on the premise of pit punching, and further the stretching degree of the pit-punching vertex angle 15 cannot be reduced in the pit punching process, so that the aluminum layer thickness of the aluminum-plastic film at the 7-corner can not be improved under a certain pit punching depth.
(3) The thickness of the aluminum layer at the angular position of the aluminum-plastic film 7 after the pit punching and the aluminum residue at the angular position of the aluminum-plastic film in the comparative example 1 are both lower than those in the embodiment 1, because the arrangement of the reducing arc surface section of the male die 3 in the pit punching die of the aluminum-plastic film in the comparative example 1 is omitted, the top corner 15 and the edge 14 are directly butted, the thickness extension of the aluminum layer at the edge 14 of the male die 3 in the pit punching process cannot be effectively reduced, and therefore the pit punching forming quality and the angular position aluminum layer thickness of the aluminum-plastic film 7 cannot be further improved.
(4) The thickness of the aluminum layer at the corner position of the aluminum-plastic film 7 after the pit punching and the residual amount of aluminum at the corner position of the plastic film in the comparative example 2 are lower than those in the embodiment 1, because the comparative example 2 omits the arrangement of a pit punching quantitative compensation component of the aluminum-plastic film in a pit punching die of the aluminum-plastic film 7, the pressing force of a low-pressure roller on the aluminum-plastic film 7 cannot be adjusted in real time in the pit punching process, and the extension of the aluminum layer at the corner position of the aluminum-plastic film 7 cannot be compensated, so that the pit punching forming quality and the corner position aluminum layer thickness of the aluminum-plastic film 7 cannot be further improved.
(5) In comparative example 3, the thickness of the aluminum layer at the 7-corner position of the aluminum-plastic film after pit punching and the residual amount of aluminum at the 7-corner position of the aluminum-plastic film are both far lower than those in example 1, and in examples 1-5, the residual amount of aluminum at the 7-corner position of the aluminum-plastic film is respectively increased by 3.2%, 6.5%, 4.0%, 8.7% and 3.4% compared with comparative example 3. This is because the conventional aluminum-plastic film crater punching mold is used to crate the aluminum-plastic film 7 in comparative example 3. Therefore, the conventional aluminum-plastic film pit punching die cannot improve the pit punching quality of the aluminum-plastic film 7 and the thickness of the angular aluminum layer, and cannot meet the pit punching requirement of a thick battery cell on the aluminum-plastic film 7.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The pit punching die for the aluminum-plastic film is characterized by comprising an upper template and a lower template, wherein an aluminum-plastic film pit punching quantitative compensation assembly is arranged between the upper template and the lower template;
the punch is characterized in that the surface of one side, close to the female die, of the male die is a punching end face, the vertex angle of the male die is a spherical surface, the edge of the male die is an arc surface, the radius of the edge is smaller than that of the vertex angle, the edge is in butt joint with the vertex angle through a variable-diameter arc surface section, and the radius of the arc surface section is gradually increased from the edge to the vertex angle.
2. The aluminum-plastic film pit punching die as claimed in claim 1, wherein the radius of the top corner is 1.8-2.3 mm.
3. The aluminum-plastic film pit punching die of claim 1 or 2, wherein the edge has a radius of 1.3-1.8 mm;
preferably, the length of the arc surface section along the edge direction is 2-5 mm.
4. The aluminum-plastic film pit punching die of any one of claims 1-3, wherein the aluminum-plastic film pit punching quantitative compensation assembly comprises a driving roller pair and a driven roller pair, and the aluminum-plastic film passes through the driving roller pair and the driven roller pair.
5. The aluminum-plastic film pit punching die of any one of claims 1-4, wherein the aluminum-plastic film pit punching quantitative compensation component further comprises a pressure sensor;
preferably, the aluminum-plastic film pit punching quantitative compensation assembly further comprises a pressure controller arranged on the lower template, and the pressure controller adjusts the pressing force applied to the aluminum-plastic film by the driving roller pair and the driven roller pair after receiving the signal of the pressure sensor.
6. The aluminum-plastic film pit punching mold according to any one of claims 1-5, wherein the aluminum-plastic film pit punching mold further comprises a preheating assembly, and the aluminum-plastic film is subjected to pit punching forming after being preheated by the preheating assembly;
preferably, the preheating assembly comprises a heating source and a temperature sensor, wherein the temperature sensor is used for monitoring the temperature of the surface of the aluminum plastic film;
preferably, the heating source comprises an LED lamp.
7. The aluminum-plastic film pit punching die of any one of claims 1-6, wherein the bottom of the female die is provided with a stripper plate.
8. A pit punching method of the aluminum-plastic film pit punching mold of any one of claims 1-7, characterized in that the pit punching method comprises:
placing the aluminum-plastic film between the upper template and the lower template, wherein the upper template moves towards the direction of the lower template, so that the male die is embedded in the female die to drive the aluminum-plastic film to deform, and performing pit punching molding on the aluminum-plastic film;
in the pit punching forming process, the aluminum-plastic film slides through the pit punching quantitative compensation assembly of the aluminum-plastic film, and the extension of the angular aluminum layer of the aluminum-plastic film is compensated.
9. The method of claim 8, further comprising:
preheating the aluminum-plastic film before pit punching and forming of the aluminum-plastic film;
preferably, the temperature of the pre-heating treatment is 35-55 ℃.
10. A method of punching a pit according to claim 8 or 9, characterized in that the method further comprises:
in the pit punching forming process, the pressing force applied to the aluminum-plastic film by the driving roller pair and the driven roller pair is adjusted by the aluminum-plastic film pit punching quantitative compensation assembly;
preferably, the pressing force is 30-50 kg.
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| CN202111665605.9A CN114393088A (en) | 2021-12-31 | 2021-12-31 | Aluminum-plastic film pit punching die and pit punching method thereof |
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