Production method of composite current collector aiming at surface line defects

Abstract

The invention provides a production method of a composite current collector aiming at surface line defects, which comprises the following steps: a base film is loaded into vacuum coating equipment, and the base film is plated with a conductive coating; adjusting a roll end wrap angle of a flattening roll close to a cooling main roll in the vacuum coating equipment, wherein the roll end wrap angle of the flattening roll is adjusted to 120-130 degrees; and the vacuum coating equipment is operated, and coating is conducted on the base film. According to the invention, the vacuum coating equipment is used for coating, the interior of the vacuum coating equipment is mainly coated by the unwinding mechanism and the evaporation source which are used for moving the film, and the wrap angle between the flattening roller close to the cooling main drum of the vacuum coating equipment and the base film coated with the conductive coating is 120-130 degrees; and line defects on the surface of the composite current collector can be reduced.

Description

Technical Field

[0001] The invention relates to the field of composite current collector production, and in particular to a composite current collector production method for surface line defects. Background Art

[0002] The composite current collector includes a base film and a coating arranged on the upper and lower surfaces of the base film. To form a coating on the surface of the composite current collector base film, vacuum coating equipment is required. Whether it is vacuum evaporation equipment or magnetron sputtering equipment, the base film will receive a large amount of heat. The current production method of the composite current collector produces a composite current collector surface that is prone to lines, so the existing technology needs to be improved and enhanced. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a method for producing a composite current collector for surface line defects.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a method for producing a composite current collector for surface line defects, comprising the steps of:

[0006] Loading a base film into a vacuum coating device, wherein the base film is a base film coated with a conductive coating;

[0007] Adjusting the roll end wrap angle of the flattening roll close to the cooling main roll in the vacuum coating equipment, wherein the roll end wrap angle of the flattening roll is adjusted to between 120° and 130°;

[0008] The vacuum coating equipment is operated to coat the base film.

[0009] Furthermore, the method for producing a composite current collector for surface line defects, before the step of operating the vacuum coating equipment to coat the base film, further comprises:

[0010] A bias device for outputting voltage is provided in the vacuum coating equipment, the positive pole of the bias device is electrically connected to the cooling main roller in the vacuum coating equipment, and the negative pole of the bias device is electrically connected to a roller in the vacuum cooling equipment.

[0011] Furthermore, the method for producing a composite current collector for surface line defects, before the step of operating the vacuum coating equipment to coat the base film, after the step of providing a bias device for outputting a voltage in the vacuum coating equipment, electrically connecting the positive electrode of the bias device to a cooling main roller in the vacuum coating equipment, and electrically connecting the negative electrode of the bias device to a roller in the vacuum cooling equipment, further comprises:

[0012] The output voltage of the bias device is set to 500V-600V.

[0013] Furthermore, the method for producing a composite current collector for surface line defects, before the step of operating the vacuum coating equipment to coat the base film, further comprises:

[0014] Adjust the tension roller in the vacuum coating equipment and adjust the tension of the tension roller to 180N-250N.

[0015] Furthermore, the method for producing a composite current collector for surface line defects, before the step of operating the vacuum coating equipment to coat the base film, further comprises:

[0016] The evaporation current of the evaporation boat in the vacuum coating equipment is adjusted to 45A-60A.

[0017] Furthermore, the method for producing a composite current collector for surface line defects, before the step of operating the vacuum coating equipment to coat the base film, further comprises:

[0018] The wire feeding speed of the wire feeding mechanism in the vacuum coating equipment for feeding material into the evaporation boat is adjusted to 30 mm / min to 60 mm / min, and a metal wire with a diameter of 1.0 mm to 1.2 mm is used for feeding.

[0019] Furthermore, the method for producing a composite current collector for surface line defects, before the step of operating the vacuum coating equipment to coat the base film, further comprises:

[0020] The cooling temperature of the cooling main roller is adjusted to -25°C to -10°C.

[0021] Furthermore, the method for producing a composite current collector for surface line defects, after the step of operating the vacuum coating equipment to coat the base film, further comprises:

[0022] After the base film is coated, the cooling main roller is subjected to a temperature increase treatment.

[0023] Furthermore, in the method for producing a composite current collector for surface line defects, the upper limit of the temperature increase for heating the cooling main roller is 35°C.

[0024] Furthermore, in the method for producing a composite current collector for surface line defects, in the step of adjusting the evaporation current of the evaporation boat in the vacuum coating equipment to 45A to 60A, the evaporation current of the evaporation boat is preferentially adjusted to 45A to 55A.

[0025] Compared with the prior art, the present invention provides a composite current collector production method for surface line defects, including the steps of: loading a base film into a vacuum coating device, wherein the base film is a base film coated with a conductive coating; adjusting the roll end wrap angle of a flattening roller close to the cooling main roller in the vacuum coating device, wherein the roll end wrap angle of the flattening roller is adjusted to between 120° and 130°; and operating the vacuum coating device to coat the base film. The present invention coats the film through a vacuum coating device, wherein the interior of the vacuum coating device mainly includes an unwinding mechanism and an evaporation source for film movement. The present invention makes the wrap angle between the flattening roller close to the cooling main drum of the vacuum coating device and the base film coated with a conductive coating between 120° and 130°, which can reduce the occurrence of line defects on the surface of the composite current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 This is a schematic structural diagram of the vacuum coating equipment provided by the present invention.

[0028] Figure 2 A schematic flow chart of a composite current collector production method for surface line defects provided by the present invention.

[0029] Description of Figure Numbers:

[0030] Vacuum Chamber 100

[0031] Flattening roller 10

[0032] Cooling main roller 20

[0033] Tension roller 30

[0034] Biasing device 40

[0035] Evaporation Boat 50

[0036] Wire feeding mechanism 60 DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] like Figure 1 As shown, the present invention is based on vacuum coating equipment for coating through vacuum coating equipment. The interior of the vacuum coating equipment is mainly coated by an unwinding mechanism and an evaporation source for film feeding. The vacuum coating equipment has a vacuum chamber 100. The vacuum chamber 100 is provided with an unwinding mechanism and an evaporation source. In addition to the unwinding roller at the head end of the film feeding and the winding roller at the end of the film feeding, the unwinding mechanism also includes a flattening roller 10, a cooling main roller 20 and a tension roller 30 on the film feeding path, and a biasing device 40. After the base film passes around the flattening roller 10, it passes around the cooling main roller 20 and then passes around the tension roller 30. The biasing device 40 is connected to the flattening roller 10 and the cooling main roller 20.

[0041] like Figure 2 As shown, the present invention provides a composite current collector production method for surface line defects, comprising the steps of:

[0042] S1, loading a base film into a vacuum coating device, wherein the base film is a base film coated with a conductive coating;

[0043] S2, adjusting the roll end wrap angle of the flattening roll 10 close to the cooling main roll 20 in the vacuum coating equipment, wherein the roll end wrap angle of the flattening roll 10 is adjusted to between 120° and 130°;

[0044] S4, operating the vacuum coating equipment to coat the base film.

[0045] Since in the vacuum coating equipment, the wrap angle between the flattening roller 10 close to the cooling main drum of the vacuum coating equipment and the base film coated with the conductive coating is between 120° and 130°, the lines on the surface of the composite current collector are reduced.

[0046] Furthermore, the composite current collector production method for surface line defects provided by the present invention further includes, before the step of operating the vacuum coating equipment to coat the base film in S4:

[0047] S3-1. A bias device 40 with an output voltage is provided in the vacuum coating equipment, and the positive pole of the bias device 40 is electrically connected to the cooling main roller 20 in the vacuum coating equipment, and the negative pole of the bias device 40 is electrically connected to a roller in the vacuum cooling equipment.

[0048] Furthermore, the composite current collector production method for surface line defects provided by the present invention, before the step of operating the vacuum coating equipment to coat the base film in S4, the bias device 40 with an output voltage is set in the vacuum coating equipment, the positive electrode of the bias device 40 is electrically connected to the cooling main roller 20 in the vacuum coating equipment, and the negative electrode of the bias device 40 is electrically connected to a roller in the vacuum cooling equipment, further includes:

[0049] The output voltage of the bias device 40 is set to 500V-600V.

[0050] The vacuum coating device in the present invention also includes a bias device 40, one end of which is connected to the coating main drum in the vacuum coating device to output positive electricity to the coating main drum, and the other end of the bias device 40 is connected to the over roller to output negative electricity to the over roller. In this way, since there is positive electricity on the coating main drum and the over roller has negative electricity, the surface of the base film is coated with a conductive coating, and the negative electricity on the over roller is transferred to the base film coated with the conductive coating. When the base film coated with the conductive coating contacts the coating main drum, under the action of the positive and negative electricity, the base film coated with the conductive coating will be more closely attached to the coating main drum, thereby improving the degree of adhesion between the coating main drum and the base film coated with the conductive coating, and further reducing the lines on the surface of the composite current collector. In this embodiment, the flattening roller 10 is connected to the negative electrode of the bias device 40.

[0051] Furthermore, the composite current collector production method for surface line defects provided by the present invention further includes, before the step of operating the vacuum coating equipment to coat the base film in S4:

[0052] S3-2, adjusting the tension roller 30 in the vacuum coating equipment, and adjusting the tension of the tension roller 30 to 180N-250N.

[0053] By adjusting the tension roller 30 in the vacuum coating equipment to the above tension, the base film coated with the conductive coating will be more closely attached to the coating main drum. This is because the base film coated with the conductive coating will be stretched tighter, and compared with the loose base film coated with the conductive coating, the tighter base film coated with the conductive coating has a larger contact area with the coating main drum, so that the coating main drum has a better cooling effect on the base film coated with the conductive coating, so the lines on the surface of the composite current collector can be further reduced.

[0054] Furthermore, the composite current collector production method for surface line defects provided by the present invention further includes, before the step of operating the vacuum coating equipment to coat the base film in S4:

[0055] S3-3, adjusting the evaporation current of the evaporation boat 50 in the vacuum coating equipment, and adjusting the evaporation current of the evaporation boat 50 to 45A-60A.

[0056] Furthermore, in the method for producing a composite current collector for surface line defects provided by the present invention, in S3-3, the step of adjusting the evaporation current of the evaporation boat 50 in the vacuum coating equipment to adjust the evaporation current of the evaporation boat 50 to 45A~60A, the evaporation current of the evaporation boat 50 is preferentially adjusted to 45A~55A.

[0057] By adjusting the evaporation current of the evaporation source in the vacuum coating equipment, the evaporation power of the evaporation source can be controlled, and then the heat received by the metal to be evaporated in the evaporation source when formed on the base film coated with the conductive coating can be controlled, and then the lines on the surface of the composite current collector can be further reduced. Through the above steps, it is conducive to completely eliminating the lines on the surface of the composite current collector, thereby achieving a high-quality composite current collector.

[0058] Furthermore, the composite current collector production method for surface line defects provided by the present invention further includes, before the step of operating the vacuum coating equipment to coat the base film in S4:

[0059] S3-4. Adjust the wire feeding speed of the wire feeding mechanism 60 in the vacuum coating equipment for feeding material into the evaporation boat 50, adjust the wire feeding speed of the wire feeding mechanism 60 to 30 mm / min to 60 mm / min, and use a metal wire with a diameter of 1.0 mm to 1.2 mm for feeding.

[0060] The evaporation source includes a wire feeding mechanism 60 and an evaporation boat 50. The wire feeding mechanism 60 feeds a metal wire into the evaporation boat 50 at a certain speed. The material of the metal wire is the material to be evaporated. Therefore, in the composite current collector production method of the present invention, the conveying speed of the metal wire is 30mm / min 60mm / min, and the diameter of the metal wire is 1mm-1.2mm. During evaporation, a diameter of 1mm-1.2mm and a conveying speed of 30mm / min 60mm / min are used to prevent the metal wire from melting and splashing, thereby burning pinholes on the base film coated with a conductive coating. This is because the diameter of the aluminum wire is too small. When the wire feeding mechanism 60 feeds the metal wire, the metal wire will swing, and instability is likely to cause the molten metal wire to splash. If the metal wire is too thick, if it is combined with a faster speed, the metal wire will not melt quickly and will pierce the evaporation boat 50. If the too thick metal wire needs to be melted, the function of the evaporation boat 50 needs to be increased, which will reduce the life of the evaporation boat 50.

[0061] Furthermore, the composite current collector production method for surface line defects provided by the present invention further includes, before the step of operating the vacuum coating equipment to coat the base film in S4:

[0062] S3-5, adjusting the cooling temperature of the cooling main roller 20, and adjusting the cooling temperature of the cooling main roller 20 to -25°C to -10°C.

[0063] Furthermore, the composite current collector production method for surface line defects provided by the present invention, after the step of operating the vacuum coating equipment to coat the base film in S4, further comprises:

[0064] S5. After the base film coating is completed, the cooling main roller 20 is subjected to a temperature increase treatment.

[0065] Furthermore, in the composite current collector production method for surface line defects provided by the present invention, the upper limit of the temperature increase for the cooling main roller 20 is 35°C.

[0066] After the coating is completed, the cooling main drum of the vacuum coating equipment is heated to gradually increase its temperature from -25 degrees Celsius to 35 degrees. Through the above steps, the temperature in the entire vacuum coating equipment can be gradually increased to allow the temperature components of the composite current collector after coating in the vacuum coating equipment to increase to room temperature, thereby preventing the risk of the low-temperature composite current collector being oxidized after encountering the outside air.

[0067] The present invention is based on vacuum coating equipment and performs coating through the vacuum coating equipment. The interior of the vacuum coating equipment is mainly coated by a unwinding mechanism and an evaporation source for film feeding. The vacuum coating equipment has a vacuum chamber 100. The vacuum chamber 100 is provided with an unwinding mechanism and an evaporation source. In addition to the unwinding roller at the head end of the film feeding and the winding roller at the end end of the film feeding, the unwinding mechanism also includes a flattening roller 10, a cooling main roller 20 and a tension roller 30 on the film feeding path, and a biasing device 40. After the base film passes around the flattening roller 10, it passes around the cooling main roller 20 and then passes around the tension roller 30. The biasing device 40 is connected to the flattening roller 10 and the cooling main roller 20.

[0068] In summary, in the vacuum coating equipment, setting the wrap angle between the flattening roller close to the cooling main drum of the vacuum coating equipment and the base film coated with the conductive coating to between 120° and 130° will reduce the lines on the surface of the composite current collector. The vacuum coating equipment in the present invention also includes a bias device, one end of which is connected to the coating main drum in the vacuum coating equipment to output positive electricity to the coating main drum, and the other end of the bias device is connected to the over-roller to output negative electricity to the over-roller. In this way, since there is positive electricity on the coating main drum and the over-roller has negative electricity, the surface of the base film is coated with a conductive coating, and the negative electricity on the over-roller is transferred to the base film coated with the conductive coating. When the base film coated with the conductive coating contacts the coating main drum, under the action of the positive and negative electricity, the base film coated with the conductive coating will be more closely attached to the coating main drum, thereby improving the degree of adhesion between the coating main drum and the base film coated with the conductive coating, and further reducing the lines on the surface of the composite current collector. In this embodiment, the flattening roller is connected to the negative electrode of the bias device.

[0069] Moreover, by adjusting the tension roller in the vacuum coating equipment to reach the above-mentioned tension, the base film coated with the conductive coating will be more closely attached to the coating main drum. This is because the base film coated with the conductive coating will be stretched tighter. Compared with the loose base film coated with the conductive coating, the tighter base film coated with the conductive coating has a larger contact area with the coating main drum, so that the coating main drum has a better cooling effect on the base film coated with the conductive coating, so the lines on the surface of the composite current collector can be further reduced. By adjusting the evaporation current of the evaporation source in the vacuum coating equipment, the evaporation power of the evaporation source can be controlled, and then the heat received by the metal to be evaporated in the evaporation source formed on the base film coated with the conductive coating can be controlled, and then the lines on the surface of the composite current collector can be further reduced. Through the above steps, it is beneficial to completely eliminate the lines on the surface of the composite current collector, thereby achieving a high-quality composite current collector.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for producing a composite current collector for surface line defects, characterized in that: Includes steps: Loading a base film into a vacuum coating device, wherein the base film is a base film coated with a conductive coating; Adjusting the roll end wrap angle of the flattening roll close to the cooling main roll in the vacuum coating equipment, wherein the roll end wrap angle of the flattening roll is adjusted to between 120° and 130°; The vacuum coating equipment is operated to coat the base film.

2. The method for producing a composite current collector for surface line defects according to claim 1, characterized in that: Before the step of operating the vacuum coating equipment to coat the base film, the method further comprises: A bias device for outputting voltage is provided in the vacuum coating equipment, the positive pole of the bias device is electrically connected to the cooling main roller in the vacuum coating equipment, and the negative pole of the bias device is electrically connected to a roller in the vacuum cooling equipment.

3. The method for producing a composite current collector for surface line defects according to claim 2, characterized in that: Before the step of operating the vacuum coating equipment to coat the base film, a bias device for outputting voltage is provided in the vacuum coating equipment, and the positive electrode of the bias device is electrically connected to a cooling main roller in the vacuum coating equipment, and the negative electrode of the bias device is electrically connected to a roller in the vacuum cooling equipment, the method further includes: The output voltage of the bias device is set to 500V-600V.

4. The method for producing a composite current collector for surface line defects according to claim 1, characterized in that: Before the step of operating the vacuum coating equipment to coat the base film, the method further comprises: Adjust the tension roller in the vacuum coating equipment and adjust the tension of the tension roller to 180N-250N.

5. The method for producing a composite current collector for surface line defects according to claim 1, characterized in that: Before the step of operating the vacuum coating equipment to coat the base film, the method further comprises: The evaporation current of the evaporation boat in the vacuum coating equipment is adjusted to 45A-60A.

6. The method for producing a composite current collector for surface line defects according to claim 5, characterized in that: Before the step of operating the vacuum coating equipment to coat the base film, the method further comprises: The wire feeding speed of the wire feeding mechanism in the vacuum coating equipment for feeding material into the evaporation boat is adjusted to 30 mm / min to 60 mm / min, and a metal wire with a diameter of 1.0 mm to 1.2 mm is used for feeding.

7. The method for producing a composite current collector for surface line defects according to claim 1, characterized in that: Before the step of operating the vacuum coating equipment to coat the base film, the method further comprises: The cooling temperature of the cooling main roller is adjusted to -25°C to -10°C.

8. The method for producing a composite current collector for surface line defects according to claim 1, characterized in that: After the step of operating the vacuum coating equipment to coat the base film, the method further includes: After the base film is coated, the cooling main roller is subjected to a temperature increase treatment.

9. The method for producing a composite current collector for surface line defects according to claim 8, characterized in that: The upper limit of the temperature increase of the cooling main roller is 35°C.

10. The method for producing a composite current collector for surface line defects according to claim 5, characterized in that: In the step of adjusting the evaporation current of the evaporation boat in the vacuum coating equipment to 45A-60A, the evaporation current of the evaporation boat is preferably adjusted to 45A-55A.

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