Double-sided coating device and battery production line

Abstract

The utility model relates to the technical field of coating, in particular to a double-sided coating device and a battery production line. The utility model provides a double-sided coating device. The double-sided coating device comprises a coating rack, a first coating machine head, a second coating machine head and a turning roller assembly, the coating machine frame is provided with a feeding side and a discharging side which are oppositely arranged and used for feeding and discharging foils, and the first coating machine head and the second coating machine head are sequentially arranged in the direction from the feeding side to the discharging side; the first coating machine head comprises a first coating die head, the second coating machine head comprises a second coating die head, and lips of the first coating die head and the second coating die head are vertically downward; the turning roller assembly is used for changing the tape conveying direction of the foil, so that the first coating die head can coat the first face of the foil, and the second coating die head can coat the second face of the foil. And the influence caused by foil shaking is avoided, the coating speed can be increased, the coating efficiency can be improved, and the coating quality can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of coating, in particular to a double-sided coating device and a battery production line. Background Art

[0002] Double-sided coating refers to coating both sides of the foil at the same time. The existing double-sided coating device is usually a single-layer coating die head. A die head is set horizontally to coat one side of the foil, with the coated side facing up and the uncoated side facing down. Another coating die head is set with the lip facing up to coat the uncoated side of the foil.

[0003] Since the weight of the foil coated on one side is relatively large, during the forward movement of the foil, the foil vibrates downward to squeeze the droplets coated upward from the lip of the other die head, resulting in poor coating quality, which is particularly obvious when the foil moves at a fast speed. Utility Model Content

[0004] The utility model aims to provide a double-sided coating device and a battery production line to solve the technical problem that in the existing double-sided coating device, during the foil advancing process, the foil shakes downward to squeeze the droplet shape coated upward from the lip of another die head, resulting in poor coating quality.

[0005] The utility model provides a double-sided coating device, which is used for coating the first side and the second side of a foil material, and comprises: a coating machine frame, a first coating machine head, a second coating machine head and a direction-changing roller assembly;

[0006] The coating machine frame has an inlet side and an outlet side which are arranged opposite to each other and for the foil to enter and exit. The first coating machine head, the second coating machine head and the direction-changing roller assembly are all arranged in the coating machine frame, and the first coating machine head and the second coating machine head are arranged in sequence along the direction from the inlet side to the outlet side.

[0007] The first coating head includes a first coating die, the second coating head includes a second coating die, and the lips of the first coating die and the second coating die are both vertically downward;

[0008] The direction-changing roller assembly is used to change the running direction of the foil material so that the first coating die head can coat the first surface of the foil material and the second coating die head can coat the second surface of the foil material.

[0009] As a further technical solution, the feed side and the discharge side are used for allowing the second side of the foil to face upwards and enter and exit the coating machine frame;

[0010] The first coating head also includes a first frame, the first frame is connected to the coating frame, the first coating die head and the direction-changing roller assembly are both arranged on the first frame, and the direction-changing roller assembly is used to make the first side of the foil face up and then face up the second side after passing through the first coating die head.

[0011] As a further technical solution, the direction-changing roller assembly includes a back roller, a rubber pressure roller, a first passing roller and a second passing roller. The back roller and the rubber pressure roller are sequentially arranged along the direction from the feeding side to the discharging side, and the back roller is arranged below the first coating die head;

[0012] The first passing roller and the second passing roller are both located on the side of the back roller facing the rubber pressing roller, and the first passing roller is used to guide the foil to pass between the back roller and the rubber pressing roller from below, so that the first side of the foil faces away from the back roller after flowing into the back roller, and the second passing roller is used to guide the foil flowing out of the back roller so that the second side of the foil faces upward.

[0013] As a further technical solution, the first coating machine head further includes a first lifting plate, a first guide rail and a first lifting cylinder;

[0014] The first lifting plate is slidably connected to the first frame through the first guide rail, the body of the first lifting cylinder is connected to the first frame, and the output end of the first lifting cylinder is connected to the first lifting plate;

[0015] The first coating die head is connected to the first lifting plate.

[0016] As a further technical solution, the first coating machine head further includes a second frame, a second lifting plate, a second guide rail, a second lifting cylinder and a side wheel assembly;

[0017] The second frame is connected to the coating frame, the second lifting plate is slidably connected to the second frame through the second guide rail, the body of the second lifting cylinder is connected to the second frame, the output end of the second lifting cylinder is connected to the second lifting plate, and the side wheel assembly is connected to the second frame and is used to clamp both sides of the foil;

[0018] The second coating die head is connected to the second lifting plate.

[0019] As a further technical solution, the side wheel assembly includes a mounting seat, a telescopic cylinder, a first roller and a second roller;

[0020] The mounting seat is connected to the second frame, the telescopic cylinder and the first roller are both connected to the mounting seat, the second roller is connected to the output end of the telescopic cylinder, and the telescopic cylinder is used to drive the second roller to move toward the first roller so that the first roller and the second roller can clamp the foil.

[0021] As a further technical solution, it also includes a deviation correction component, which is arranged between the feeding side and the first coating machine head, and the deviation correction component is used to correct the foil during tape running.

[0022] As a further technical solution, it also includes a first wet film surface density detector, which is arranged between the first coating machine head and the second coating machine head and is used to detect the coating surface density of the foil;

[0023] and / or;

[0024] It also includes a second wet film surface density detector, which is arranged between the second coating machine head and the discharge side and is used to detect the coating surface density of the foil material.

[0025] As a further technical solution, it further includes a first appearance detector, which is arranged between the first coating head and the second coating head and is used to detect the appearance of the first surface of the foil;

[0026] and / or;

[0027] It also includes a second appearance detector, which is arranged between the second coating machine head and the discharge side and is used to detect the appearance of the second surface of the foil.

[0028] The utility model provides a battery production line, which comprises the double-sided coating device.

[0029] Compared with the prior art, the double-sided coating device and battery production line provided by the utility model have the following technical advantages:

[0030] The double-sided coating device provided by the utility model is used for coating the first side and the second side of a foil material, and comprises: a coating machine frame, a first coating machine head, a second coating machine head and a direction-changing roller assembly; the coating machine frame has an inlet side and an outlet side which are arranged oppositely and for feeding and exiting the foil material, the first coating machine head, the second coating machine head and the direction-changing roller assembly are all arranged in the coating machine frame, and the first coating machine head and the second coating machine head are arranged in sequence along the direction from the inlet side to the outlet side; the first coating machine head comprises a first coating die head, the second coating machine head comprises a second coating die head, and the lips of the first coating die head and the second coating die head are both vertically downward; the direction-changing roller assembly is used for changing the running direction of the foil material, so that the first coating die head can coat the first side of the foil material and the second coating die head can coat the second side of the foil material.

[0031] The foil can enter the coating frame from the feeding side of the coating frame with the first side facing upward. At this time, the first coating die head first coats the first side of the foil downward, and changes the direction of the foil coated on the first side through the changing roller assembly, so that the second side of the foil faces upward. After the second coating die head coats the second side of the foil downward, the foil coated on the second side is changed by the changing roller assembly so that the first side faces upward and flows out from the discharging side; the foil can also enter the coating frame from the feeding side of the coating frame with the second side facing upward. At this time, the foil is changed by the changing roller assembly so that the first side faces upward. After the first coating die head first coats the first side of the foil downward, the foil coated on the first side is changed by the changing roller assembly so that the second side of the foil faces upward, and the second coating die head coats the second side of the foil downward and then flows out from the discharging side. The foil enters and exits the coating frame from the opposite feeding side and discharging side, which facilitates the arrangement of other devices outside the coating frame with the foil so that they can be arranged in one line, saving space. At the same time, the first coating die head coats the first side of the foil and the second coating die head coats the second side of the foil with the lip facing downward, avoiding the influence of foil shaking, which can not only speed up the coating speed and improve the coating efficiency, but also ensure the coating quality.

[0032] The battery production line provided by the utility model includes the above-mentioned double-sided coating device, and thus the technical advantages and effects achieved by it include the technical advantages and effects achieved by the above-mentioned double-sided coating device, which will not be elaborated in detail here.

[0033] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a double-sided coating device provided in an embodiment of the utility model;

[0036] Figure 2 A schematic diagram of the structure of a first coating machine head provided in an embodiment of the utility model;

[0037] Figure 3 A schematic diagram of the structure of a second coating machine head provided in an embodiment of the utility model;

[0038] Figure 4 A schematic diagram of the structure of an edge roller assembly provided in an embodiment of the utility model.

[0039] Icons: 1-coating machine frame; 2-first coating machine head; 3-second coating machine head; 4-first coating die; 5-second coating die; 6-first frame; 7-back roller; 8-rubber pressure roller; 9-first over roller; 10-second over roller; 11-first lifting plate; 12-first lifting cylinder; 13-second frame; 14-second lifting plate; 15-second lifting cylinder; 16-side wheel assembly; 17-mounting seat; 18-telescopic cylinder; 19-first roller; 20-second roller; 21-correction assembly; 22-first wet film surface density tester; 23-second wet film surface density tester; 24-first appearance tester; 25-second appearance tester; 26-third over roller. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0045] Specific structure such as Figures 1 to 4 shown.

[0046] The present embodiment provides a double-sided coating device for coating the first side and the second side of a foil, comprising: a coating frame 1, a first coating head 2, a second coating head 3 and a direction-changing roller assembly; the coating frame 1 has an inlet side and an outlet side which are arranged opposite to each other and for feeding and exiting the foil, the first coating head 2, the second coating head 3 and the direction-changing roller assembly are all arranged in the coating frame 1, and the first coating head 2 and the second coating head 3 are arranged in sequence along the direction from the inlet side to the outlet side; the first coating head 2 includes a first coating die 4, the second coating head 3 includes a second coating die 5, and the lips of the first coating die 4 and the second coating die 5 are both vertically downward; the direction-changing roller assembly is used to change the running direction of the foil, so that the first coating die 4 can coat the first side of the foil and the second coating die 5 can coat the second side of the foil.

[0047] In this embodiment, the foil can enter the coating frame 1 from the feeding side of the coating frame 1 with the first side facing upward. At this time, the first coating die head 4 first coats the first side of the foil downward, and changes the direction of the foil coated on the first side through the changing roller assembly so that the second side of the foil faces upward. After the second coating die head 5 coats the second side of the foil downward, the foil coated on the second side is changed through the changing roller assembly so that the first side faces upward and flows out from the discharging side; the foil can also enter the coating frame 1 from the feeding side of the coating frame 1 with the second side facing upward. At this time, the foil is changed through the changing roller assembly so that the first side faces upward. After the first coating die head 4 coats the first side of the foil downward, the foil coated on the first side is changed through the changing roller assembly so that the second side of the foil faces upward, and the second coating die head 5 coats the second side of the foil downward and then flows out from the discharging side. The foil enters and exits the coating machine frame 1 from the opposite feeding side and discharging side, which facilitates the arrangement of other devices outside the coating machine frame 1 with the foil so that they can be arranged in one line, saving space. At the same time, the first coating die head 4 coats the first side of the foil and the second coating die head 5 coats the second side of the foil with the lip facing downward, avoiding the influence of the foil shaking, which can not only speed up the coating speed and improve the coating efficiency, but also ensure the coating quality.

[0048] It should be noted that the advantages of the downward kiss coating of the first coating die 4 and the second coating die 5 are: the GAP (the distance between the foil and the lip) between the foil and the lip is more stable, while the upward kiss coating is affected by the coating gravity towards the GAP, and the GAP fluctuation stability is poor, but the gravity of the downward kiss coating is in the opposite direction to the GAP, and has less effect on the GAP fluctuation. The stability of the GAP determines the stability of the coating quality. The smaller the GAP fluctuation, the more stable the coating. Therefore, the coating quality of the downward kiss coating is better.

[0049] Specifically, an inlet is provided on the feeding side, and an outlet is provided on the outlet side, and the inlet and the outlet are opposite to each other, so as to facilitate the foil to enter and exit the coating frame 1 in the horizontal direction, and further facilitate the installation and coordination of other equipment on both sides of the coating frame 1.

[0050] Preferably, in this embodiment, the feed side and the discharge side are used to supply the foil with the second side facing upward to enter and exit the coating machine frame 1; the first coating machine head 2 also includes a first frame 6, the first frame 6 is connected to the coating machine frame 1, the first coating die head 4 and the direction-changing roller assembly are both arranged on the first frame 6, and the direction-changing roller assembly is used to make the foil with the first side facing upward pass through the first coating die head 4 and then face the second side upward.

[0051] In this embodiment, the direction-changing roller assembly and the first coating die head 4 are both arranged on the first frame 6. The direction-changing roller assembly allows the foil to change direction from the second side facing up to the first side facing up so that it can pass directly under the first coating die head 4, thereby reducing the belt path and ensuring the coating effect. At the same time, the first frame 6 is installed on the coating frame 1 for easy disassembly and maintenance.

[0052] In the optional technical scheme of this embodiment, the direction-changing roller assembly includes a back roller 7, a rubber pressure roller 8, a first passing roller 9 and a second passing roller 10. The back roller 7 and the rubber pressure roller 8 are arranged in sequence along the direction from the feeding side to the discharging side, and the back roller 7 is arranged below the first coating die head 4; the first passing roller 9 and the second passing roller 10 are both located on the side of the back roller 7 facing the rubber pressure roller 8, and the first passing roller 9 is used to guide the foil to pass between the back roller 7 and the rubber pressure roller 8 from below, so that the first side of the foil flows into the back roller 7 and faces away from the back roller 7, and the second passing roller 10 is used to guide the foil flowing out of the back roller 7 so that the second side of the foil faces upward.

[0053] In this embodiment, after the foil with the second side facing upward enters the coating machine frame 1 from the feeding side, it changes direction after passing through the third roller 26 and bypasses the first coating die 4 from above. The foil passes through the first side and passes through the first roller 9 and changes direction from below to pass between the back roller 7 and the rubber pressure roller 8 to enter the back roller 7 and pass between the back roller 7 and the first coating die 4. At this time, the second side of the foil is attached to the back roller 7, and the first side corresponds to the lip of the first coating die 4. After the first side is coated, the second side passes through the second roller 10 for guidance, and the foil is changed to the second side facing upward and horizontally running. The foil enters the coating machine frame 1 with the second side facing upward, and after the first side passes through the first roller 9 and changes direction, the first side is coated upward at the back roller 7 first, and then the second side passes through the second roller 10 and changes direction so that the second side faces upward. This setting prevents the second roller 10 from contacting the first side after coating, thereby ensuring the coating effect. At the same time, the foil is pressed against the back roller 7 by the rubber pressure roller 8 to prevent the foil from slipping.

[0054] In the optional technical solution of this embodiment, the first coating head 2 also includes a first lifting plate 11, a first guide rail and a first lifting cylinder 12; the first lifting plate 11 is slidably connected to the first frame 6 through the first guide rail, the main body of the first lifting cylinder 12 is connected to the first frame 6, and the output end of the first lifting cylinder 12 is connected to the first lifting plate 11; the first coating die head 4 is connected to the first lifting plate 11.

[0055] In this embodiment, the first lifting cylinder 12 drives the first mounting plate to slide on the first guide rail relative to the first frame 6, so that the first mounting plate drives the first coating die head 4 to move, thereby adjusting the lip height of the first coating die head 4, that is, adjusting the distance between the lip of the first coating die head 4 and the first surface of the foil, thereby ensuring the coating effect.

[0056] In the optional technical solution of this embodiment, the first coating head 2 also includes a second frame 13, a second lifting plate 14, a second guide rail, a second lifting cylinder 15 and a side wheel assembly 16; the second frame 13 is connected to the coating frame 1, the second lifting plate 14 is slidably connected to the second frame 13 through the second guide rail, the body of the second lifting cylinder 15 is connected to the second frame 13, the output end of the second lifting cylinder 15 is connected to the second lifting plate 14, the side wheel assembly 16 is connected to the second frame 13, and is used to clamp both sides of the foil; the second coating die head 5 is connected to the second lifting plate 14.

[0057] In this embodiment, the second lifting cylinder 15 drives the second mounting plate to slide relative to the second frame 13 on the second guide rail, so that the second mounting plate drives the second coating die head 5 to move, thereby adjusting the lip height of the second coating die head 5, that is, adjusting the distance between the lip of the second coating die head 5 and the second surface of the foil, thereby ensuring the coating effect. At the same time, the second frame 13 is installed on the coating frame 1 for easy disassembly and maintenance. The side roller assembly is located between the second coating die head 5 and the discharge side, that is, located downstream of the second coating die head 5. The side roller assembly clamps the edges of both sides of the foil so that the foil will be tightly clamped, thereby reducing the vibration of the foil.

[0058] It should be noted that if the foil enters the feed side with the first side facing upward, the direction-changing roller assembly is arranged on the second frame 13. At the same time, in order to avoid the coating contact between the direction-changing roller assembly and the first side, the direction-changing roller assembly includes a plurality of side rollers, and the side rollers are used to contact the two side edges of the foil to prevent the coating contact with the first side; the first side of the foil is coated through the first coating die 4, and then the foil bypasses the second coating die 5 from above. After the foil is changed direction by the side roller, the second side of the foil passes through the second coating die 5 facing upward, and then the foil is changed direction by the side roller to make the first side face upward and flow out of the coating frame 1.

[0059] In the optional technical solution of this embodiment, the side wheel assembly 16 includes a mounting seat 17, a telescopic cylinder 18, a first roller 19 and a second roller 20; the mounting seat 17 is connected to the second frame 13, the telescopic cylinder 18 and the first roller 19 are both connected to the mounting seat 17, the second roller 20 is connected to the output end of the telescopic cylinder 18, and the telescopic cylinder 18 is used to drive the second roller 20 to move toward the first roller 19 so that the first roller 19 and the second roller 20 can clamp the foil.

[0060] In this embodiment, the telescopic cylinder 18 and the first roller 19 are installed on the second frame 13 through the mounting seat 17, and the output end of the telescopic cylinder 18 is connected to the second roller. Through the extension and retraction of the telescopic cylinder 18, the first roller 19 and the second roller 20 can clamp the foil or release the foil. The structure is simple and the installation is convenient.

[0061] The optional technical solution of this embodiment further includes a deviation correction component 21, which is arranged between the feeding side and the first coating machine head 2, and is used to correct the foil running.

[0062] In this embodiment, after the foil enters the coating machine frame 1 from the feeding side, it first passes through the correction component 21 to correct the position of the foil through traveling correction, so that the foil is centered, ensuring the position accuracy when coating the first and second surfaces of the foil later, thereby ensuring the coating effect.

[0063] The optional technical solution of this embodiment also includes a first wet film surface density detector 22, which is arranged between the first coating head 2 and the second coating head 3 and is used to detect the coating surface density of the foil; and / or; it also includes a second wet film surface density detector 23, which is arranged between the second coating head 3 and the discharge side and is used to detect the coating surface density of the foil.

[0064] In this embodiment, a first wet film surface density detector 22 is arranged between the first coating head 2 and the second coating head 3, and a second wet film surface density detector 23 is arranged between the second coating head 3 and the discharge side. By detecting the first surface coating density and the second surface coating density after coating the foil, the coating parameters are adjusted according to the detection results to ensure that the coating quality meets the requirements.

[0065] The optional technical solution of this embodiment also includes a first appearance detector 24, which is arranged between the first coating head 2 and the second coating head 3 and is used to detect the appearance of the first side of the foil; and / or; it also includes a second appearance detector 25, which is arranged between the second coating head 3 and the discharge side and is used to detect the appearance of the second side of the foil.

[0066] In this embodiment, a first appearance detector 24 is provided between the first coating head 2 and the second coating head 3, and a second appearance detector 25 is provided between the second coating head 3 and the discharge side. The first and second appearances of the foil after coating are inspected, and coating parameters are adjusted according to the inspection results to ensure that the coating quality meets the requirements. The specific appearance inspection includes the size and defects of the coated surface.

[0067] In this embodiment, preferably, the first appearance inspection instrument 24 and the second appearance inspection instrument 25 are both CCD cameras, but are not limited thereto and may also be other industrial cameras as long as the requirements are met.

[0068] In the specific working process of this embodiment, the foil is first corrected by the correction component 21, and then passes through the third roller 26 to the top of the first coating head 2, avoids the first coating die head 4, and then passes through the first roller 9 to the inside of the first coating head 2, and the foil is pressed onto the back roller 7 by the rubber pressure roller 8 to prevent the foil from slipping. The first coating die head 4 is driven by the first lifting cylinder 12 to descend to the working position and then starts coating. The first coating die head 4 applies the slurry to the upper surface of the foil, that is, the second side. At this time, the back roller 7 rotates counterclockwise, and the side of the foil coated with the slurry will turn to the downward direction as the back roller 7 rotates. After the second side is coated, it will be sequentially inspected for defects by the first appearance detector 24 and the first wet film surface density detector 22 and the surface density of the second side. The foil continues to move forward to the second coating die 5, and the second coating die 5 applies the slurry to the second side of the foil. When coating the second side, multiple sets of edge wheel assemblies 16 are used to clamp both sides of the foil to provide auxiliary support to reduce the vibration of the foil. After the second side is coated, the surface density of the first side and the second side is firstly inspected by the second wet film surface density detector 23, and then the second side is inspected for defects by the second appearance detector 25.

[0069] It should be noted that extrusion coating is a coating die that coats the foil that is passed around the backing roller, and the lip of the coating die is directly opposite to the axis of the backing roller. Kiss coating is different from extrusion coating, and there is no backing roller support. The first coating die 4 in this embodiment is extrusion coating.

[0070] Conventional extrusion coating is done horizontally. The lip of the coating die is horizontally facing the axis of the backing roller. The foil moves from the lip of the lower die to the lip of the upper die. The thickness of the coating is controlled by the lip of the upper die. The position of the upper die lip cannot be lower than that of the lower die lip, otherwise it cannot control the coating thickness.

[0071] A battery production line provided in this embodiment includes the above-mentioned double-sided coating device. Therefore, the technical advantages and effects achieved by the battery production line include the technical advantages and effects achieved by the above-mentioned double-sided coating device, which will not be repeated here.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A double-sided coating device for coating a first side and a second side of a foil, characterized in that: include: A coating machine frame (1), a first coating machine head (2), a second coating machine head (3) and a direction-changing roller assembly; The coating machine frame (1) has an inlet side and an outlet side which are arranged opposite to each other and for feeding and discharging the foil material; the first coating machine head (2), the second coating machine head (3) and the direction-changing roller assembly are all arranged in the coating machine frame (1); and along the direction from the inlet side to the outlet side, the first coating machine head (2) and the second coating machine head (3) are arranged in sequence; The first coating head (2) comprises a first coating die head (4), the second coating head (3) comprises a second coating die head (5), and the lips of the first coating die head (4) and the second coating die head (5) are both vertically downward; The direction-changing roller assembly is used to change the running direction of the foil material so that the first coating die head (4) can coat the first side of the foil material and the second coating die head (5) can coat the second side of the foil material.

2. The double-sided coating device according to claim 1, characterized in that: The inlet side and the outlet side are used for allowing the second side of the foil to enter and exit the coating machine frame (1) with the second side facing upward; The first coating machine head (2) further comprises a first frame (6), wherein the first frame (6) is connected to the coating machine frame (1), the first coating die head (4) and the direction-changing roller assembly are both arranged on the first frame (6), and the direction-changing roller assembly is used to make the first side of the foil face upwards and then face the second side upwards after passing through the first coating die head (4).

3. The double-sided coating device according to claim 2, characterized in that: The direction-changing roller assembly comprises a back roller (7), a rubber pressure roller (8), a first passing roller (9) and a second passing roller (10), and the back roller (7) and the rubber pressure roller (8) are arranged in sequence along the direction from the feeding side to the discharging side, and the back roller (7) is arranged below the first coating die head (4); The first passing roller (9) and the second passing roller (10) are both located on the side of the back roller (7) facing the rubber pressing roller (8), and the first passing roller (9) is used to guide the foil to pass between the back roller (7) and the rubber pressing roller (8) from below, so that the first side of the foil faces away from the back roller (7) after flowing into the back roller (7), and the second passing roller (10) is used to guide the foil flowing out of the back roller (7) so that the second side of the foil faces upward.

4. The double-sided coating device according to claim 2, characterized in that: The first coating machine head (2) further comprises a first lifting plate (11), a first guide rail and a first lifting cylinder (12); The first lifting plate (11) is slidably connected to the first frame (6) via the first guide rail, the body of the first lifting cylinder (12) is connected to the first frame (6), and the output end of the first lifting cylinder (12) is connected to the first lifting plate (11); The first coating die head (4) is connected to the first lifting plate (11).

5. The double-sided coating device according to claim 1, characterized in that: The first coating machine head (2) further comprises a second frame (13), a second lifting plate (14), a second guide rail, a second lifting cylinder (15) and a side wheel assembly (16); The second frame (13) is connected to the coating frame (1), the second lifting plate (14) is slidably connected to the second frame (13) via the second guide rail, the body of the second lifting cylinder (15) is connected to the second frame (13), the output end of the second lifting cylinder (15) is connected to the second lifting plate (14), and the side wheel assembly (16) is connected to the second frame (13) and is used to clamp two sides of the foil; The second coating die head (5) is connected to the second lifting plate (14).

6. The double-sided coating device according to claim 5, characterized in that: The side wheel assembly (16) comprises a mounting seat (17), a telescopic cylinder (18), a first roller (19) and a second roller (20); The mounting seat (17) is connected to the second frame (13), the telescopic cylinder (18) and the first roller (19) are both connected to the mounting seat (17), the second roller (20) is connected to the output end of the telescopic cylinder (18), and the telescopic cylinder (18) is used to drive the second roller (20) to move toward the first roller (19), so that the first roller (19) and the second roller (20) can clamp the foil.

7. The double-sided coating device according to any one of claims 1 to 6, characterized in that: It also comprises a deviation correction component (21), which is arranged between the material feeding side and the first coating machine head (2), and is used for correcting the deviation of the foil during its conveying.

8. The double-sided coating device according to any one of claims 1 to 6, characterized in that: It also comprises a first wet film surface density detector (22), which is arranged between the first coating machine head (2) and the second coating machine head (3) and is used to detect the coating surface density of the foil material; and / or; It also comprises a second wet film surface density detector (23), which is arranged between the second coating machine head (3) and the discharge side and is used to detect the coating surface density of the foil material.

9. The double-sided coating device according to any one of claims 1 to 6, characterized in that: It also includes a first appearance detector (24), which is arranged between the first coating machine head (2) and the second coating machine head (3) and is used to detect the appearance of the first surface of the foil; and / or; It also comprises a second appearance detector (25), which is arranged between the second coating machine head (3) and the discharge side and is used to detect the appearance of the second surface of the foil.

10. A battery production line, characterized in that: The double-sided coating device comprises the double-sided coating device according to any one of claims 1 to 9.

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