Double-sided coating equipment

Abstract

The utility model belongs to the technical field of coating, and particularly relates to double-side coating equipment, which comprises an A-side film area coating die head, an A-side film area coating die head, an A-side film area coating die head and a B-side film area coating die head, the A-side protective layer coating die head is used for coating the edge of the foil on the A side of the pole piece; the B surface protective layer coating die head is used for coating the edge of the foil on the B surface of the pole piece; the B surface film area coating die head is used for coating a foil film area on the B surface of the pole piece; the heating and drying device is used for heating and drying the pole piece coated by the A surface film area coating die head, the A surface protective layer coating die head and the B surface protective layer coating die head; the device has the beneficial effects that the foil edges of the pole piece A surface and the pole piece B surface are firstly coated, then the pole piece is baked and dried, and two kinds of slurry on the pole piece B surface can be prevented from being mutually fused when the foil film area of the pole piece B surface is subsequently coated.

Description

Technical Field

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

[0002] At present, burrs will be generated in the die-cutting process of the pole pieces of secondary batteries, which will pierce the separator between the positive and negative electrodes of the battery during subsequent production and use, causing analysis risks. Therefore, a protective layer such as an insulating layer such as ceramic glue is applied to the edge of the pole piece membrane area (i.e., the area where the pole piece is coated with an active material layer). However, since the protective layer slurry and the membrane area slurry applied to the pole piece membrane area are two different slurries, they will fuse before they are completely dry, making it inconvenient to die-cut and grasp the edges.

[0003] In the prior art, since the coating operation on the A side of the pole piece is carried out on a blank foil, the two slurries are less affected during the coating process and are well fused; while the coating operation on the B side of the pole piece is carried out on the basis of the coating on the A side of the pole piece, and there needs to be a thinning area at both ends of the membrane area (that is, an area where the thickness is thinner than the middle area of ​​the die-cut and the thickness decreases away from the middle area), resulting in an uneven distance between the coating die head at the edge position and the support traction, which will cause the two slurries on the B side of the pole piece to fuse more seriously. Utility Model Content

[0004] The purpose of the utility model is to provide a double-sided coating device to solve the above-mentioned technical problems, so as to achieve the effect that the two slurries coated on the B surface of the pole piece are not easy to merge.

[0005] In view of this, the utility model provides a double-sided coating device, comprising:

[0006] A surface film area coating die head, the A surface film area coating die head is used to coat the foil film area of ​​the A surface of the electrode;

[0007] A surface protective layer coating die head, the A surface protective layer coating die head is used to coat the edge of the foil material on the A surface of the pole piece;

[0008] A B-side protective layer coating die head, which is used to coat the edge of the foil material on the B-side of the pole piece;

[0009] A coating die for the B-surface film area, wherein the coating die for the B-surface film area is used to coat the foil film area on the B-surface of the electrode;

[0010] A heating and drying device, which is used to heat and dry the electrode after it has been coated by the A-surface mask area coating die, the A-surface protective layer coating die and the B-surface protective layer coating die;

[0011] Among them, the A mask area coating die head, the A surface protective layer coating die head and the B surface protective layer coating die head are all located upstream of the heating and drying device, and the B mask area coating die head is located downstream of the heating and drying device.

[0012] Furthermore, the A-surface film area coating die head and the A-surface protective layer coating die head are arranged side by side for simultaneously coating the foil film area and foil edge of the A-surface of the electrode.

[0013] Furthermore, the A-surface film area coating die head is relatively provided with a supporting traction roller, and the A-surface film area coating die head is used for coating the foil film area on the A-surface of the electrode piece located on the supporting traction roller, and a rubber pressure roller cooperating with the supporting traction roller to achieve tension isolation is arranged upstream of the A-surface film area coating die head; and / or, the B-surface film area coating die head is relatively provided with a supporting traction roller, and the B-surface film area coating die head is used for coating the foil film area on the B-surface of the electrode piece located on the supporting traction roller, and a rubber pressure roller cooperating with the supporting traction roller to achieve tension isolation is arranged upstream of the B-surface film area coating die head.

[0014] Furthermore, it also includes a traction device, which is arranged downstream of the heating and drying device and is used to straighten the electrode located at the B-side protective layer coating die head.

[0015] Furthermore, the traction device is a traction roller.

[0016] Furthermore, the heating and drying device is an oven.

[0017] Furthermore, the oven comprises an upper air inlet and a lower air inlet, and the pole piece is suspended between the upper air inlet and the lower air inlet.

[0018] Furthermore, it also includes a deviation correction device, which is arranged downstream of the heating and drying device.

[0019] Furthermore, it also includes a weighing device, which is arranged downstream of the heating and drying device.

[0020] The beneficial effects of the utility model are:

[0021] 1. While coating the electrode A side, the protective layer is coated on the edge of the foil on the electrode B side, and then the film area slurry and the protective layer slurry on the electrode are baked and dried by a heating and drying device, so that the two slurries on the electrode B side can be prevented from merging with each other when the foil film area on the electrode B side is subsequently coated.

[0022] 2. A traction device is provided to pull the foil that has completed the coating operation through the heating and drying device. At the same time, the electrode can be straightened as a whole, so that the foil can remain flat when the B-side film area coating die head coats the B-side of the electrode, thereby making the slurry in the film area evenly coated.

[0023] 3. When the electrode passes through the oven, it is suspended between the upper and lower air outlets of the oven. With the traction provided by the traction device, the electrode shakes less in the oven and can pass through the oven smoothly, thereby ensuring that the slurry on the electrode can be evenly dried. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a sectional view of the overall structure of the utility model;

[0025] Figure 2 It is a partial structural schematic diagram of the utility model;

[0026] The symbols in the figure are:

[0027] 1. Coating die head for mask area A; 2. Coating die head for protective layer on surface B; 3. Coating die head for mask area B; 4. Heating and drying device; 5. Traction device; 6. Pole piece A side; 7. Pole piece B side; 8. Glue pressing roller; 9. Support traction roller. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] Embodiment 1:

[0031] This embodiment provides a double-sided coating device, including:

[0032] A surface film area coating die head 1, the A surface film area coating die head 1 is used to coat the foil film area of ​​the pole piece A surface 6;

[0033] A surface protective layer coating die head, the A surface protective layer coating die head is used to coat the edge of the foil material of the pole piece A surface 6;

[0034] A B-side protective layer coating die head 2, wherein the B-side protective layer coating die head 2 is used to coat the edge of the foil material of the B-side 7 of the pole piece;

[0035] The B-surface film area coating die head 3 is used to coat the foil film area of ​​the B-surface 7 of the electrode;

[0036] A heating and drying device 4, the heating and drying device 4 is used to heat and dry the electrode after it has been coated by the A surface mask area coating die 1, the A surface protective layer coating die and the B surface protective layer coating die 2;

[0037] Among them, the A surface mask area coating die head 1, the A surface protective layer coating die head and the B surface protective layer coating die head 2 are all located upstream of the heating and drying device 4, and the B surface mask area coating die head 3 is located downstream of the heating and drying device 4.

[0038] In the present technical scheme, the A-side film area coating die 1 coats the foil film area of ​​the A-side 6 of the pole piece, the A-side protective layer coating die (not shown in the figure) coats the foil edge of the A-side 6 of the pole piece with a protective layer, and the B-side protective layer coating die 2 coats the foil edge of the B-side 7 of the pole piece with a protective layer. In the present embodiment, the protective layer is specifically ceramic glue. After the coating is completed; the pole piece passes through a heating and drying device 4 to dry the two slurries on the A-side 6 of the pole piece and the ceramic glue slurry on the B-side 7 of the pole piece, and then passes through the B-side film area coating die 3 to coat the foil film area of ​​the B-side 7 of the pole piece, thereby ensuring that the protective layer slurry and the membrane area slurry on the B-side 7 of the pole piece will not fuse.

[0039] Through this structural design, a protective layer is coated on the edge of the foil on the pole piece B side 7 while coating the pole piece A side 6, and then the slurry on the pole piece is baked and dried by the heating and drying device 4, so that when the foil film area on the pole piece B side 7 is subsequently coated, the two slurries on the pole piece B side 7 can be prevented from merging with each other.

[0040] Embodiment 2:

[0041] This embodiment provides a double-sided coating device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0042] Furthermore, the A-surface film area coating die head 1 and the A-surface protective layer coating die head are arranged side by side for simultaneously coating the foil film area and the foil edge of the pole piece A-surface 6 .

[0043] In the present technical solution, since the fusion effect of the two slurries during the coating process is relatively small when coating on a blank foil, an A-side film area coating die 1 and an A-side protective layer coating die are provided to simultaneously coat the foil film area and foil edge of the pole piece A-side 6, thereby effectively improving the coating work efficiency of the pole piece A-side 6.

[0044] Embodiment 3:

[0045] This embodiment provides a double-sided coating device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0046] Furthermore, the A-surface mask area coating die 1 is relatively provided with a supporting traction roller 9, and the A-surface mask area coating die 1 is used to coat the foil film area of ​​the pole piece A surface 6 located on the supporting traction roller 9, and a rubber pressure roller 8 is provided upstream of the A-surface mask area coating die 1 for cooperating with the supporting traction roller 9 to achieve tension isolation; and / or, the B-surface mask area coating die 3 is relatively provided with a supporting traction roller 9, and the B-surface mask area coating die 3 is used to coat the foil film area of ​​the pole piece B surface 7 located on the supporting traction roller 9, and a rubber pressure roller 8 is provided upstream of the B-surface mask area coating die 3 for cooperating with the supporting traction roller 9 to achieve tension isolation.

[0047] In this technical solution, before the electrode 1 passes through the A-surface film area coating die 1 or the B-surface film area coating die 3, the tension interval is achieved by cooperating with the supporting traction roller 9 and the rubber pressure roller 8, which can improve the coating accuracy of the foil film area.

[0048] Embodiment 4:

[0049] This embodiment provides a double-sided coating device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0050] Furthermore, it also includes a traction device 5, which is arranged downstream of the heating and drying device 4 and upstream of the B-face film area coating die 3, and is used to straighten the electrode located at the B-face protective layer coating die 2.

[0051] In the present technical solution, the B-side protective layer coating die 2 is arranged upstream of the heating and drying device 4 and below the foil, and a traction device 5 is arranged downstream of the heating and drying device 4. The traction device 5 pulls the foil that has completed the coating operation through the heating and drying device 4, and at the same time can also straighten the electrode as a whole, so that the B-side protective layer coating die 2 can keep the foil flat when coating the B side 7 of the electrode, so that the slurry is evenly coated.

[0052] Furthermore, the traction device 5 is a traction roller. The traction roller can also play a guiding role to prevent the foil from deviating from the transportation track, thereby ensuring that the equipment can operate stably and improving production efficiency. Furthermore, multiple traction rollers are provided along the transmission direction of the pole piece, so as to achieve a better straightening effect.

[0053] Embodiment 5:

[0054] This embodiment provides a double-sided coating device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0055] Furthermore, the heating and drying device 4 is an oven.

[0056] In the present technical solution, the heating and drying device 4 adopts an oven, which can provide uniform heating for the electrode, ensuring that the electrode is subjected to the same temperature during the entire drying process, thereby helping to avoid the problem of uneven drying of the slurry on the foil.

[0057] Furthermore, the oven includes an upper air inlet and a lower air inlet, and the pole piece is suspended between the upper air inlet and the lower air inlet. The structural design of the upper air inlet and the lower air inlet ensures sufficient ventilation and heat transfer. At the same time, the pole piece is suspended between the upper air inlet and the lower air inlet of the oven, and the traction force provided by the traction device 5 is combined, so that the pole piece in the oven has less shaking and can pass through the oven smoothly, thereby ensuring that the slurry can be dried evenly.

[0058] Embodiment 6:

[0059] This embodiment provides a double-sided coating device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0060] Furthermore, it also includes a deviation correction device, which is arranged downstream of the heating and drying device 4 and upstream of the B-face film area coating die 3.

[0061] In this technical solution, the deviation correction device is an existing technology and can be used to correct the position of the pole piece to ensure that the B-side film area coating die 3 can accurately apply the slurry to the foil film area of ​​the B-side 7 of the pole piece to avoid deviation from the coating design requirements.

[0062] Furthermore, it also includes a weighing device, which is arranged downstream of the heating and drying device 4 and upstream of the coating die 3 of the B-face film area.

[0063] In the present technical solution, the weighing device is also a prior art, which can be used to measure the surface density of the film area of ​​the pole piece A side 6, and can be used to characterize the stability of controlling battery performance.

[0064] Furthermore, a heating and drying device and a weighing device may be provided on the B-side film area coating die 3 to dry the film area slurry on the B-side and measure the surface density of the film area on the B-side 7 of the electrode by the weighing device.

[0065] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A double-sided coating device, characterized in that: include: A surface film area coating die head (1), the A surface film area coating die head (1) is used to coat the foil film area of ​​the A surface (6) of the electrode; A surface protective layer coating die head, the A surface protective layer coating die head is used to coat the edge of the foil material on the A surface (6) of the pole piece; A B-side protective layer coating die head (2), wherein the B-side protective layer coating die head (2) is used to coat the edge of the foil material on the B-side (7) of the pole piece; A B-surface film area coating die head (3), wherein the B-surface film area coating die head (3) is used to coat the foil film area of ​​the B-surface (7) of the electrode; A heating and drying device (4), the heating and drying device (4) is used to heat and dry the electrode after it has been coated by the A-surface mask area coating die (1), the A-surface protective layer coating die and the B-surface protective layer coating die (2); The A-surface mask area coating die (1), the A-surface protective layer coating die and the B-surface protective layer coating die (2) are all located upstream of the heating and drying device (4), and the B-surface mask area coating die (3) is located downstream of the heating and drying device (4).

2. A double-sided coating device according to claim 1, characterized in that: The A-surface film area coating die head (1) and the A-surface protective layer coating die head are arranged side by side and are used to simultaneously coat the foil film area and the foil edge of the pole piece A-surface (6).

3. A double-sided coating device according to claim 1, characterized in that: The A-surface film area coating die head (1) is provided with a supporting traction roller (9) opposite thereto, and the A-surface film area coating die head (1) is used to coat the foil film area of ​​the electrode A surface (6) located on the supporting traction roller (9), and a rubber pressure roller (8) is provided upstream of the A-surface film area coating die head (1) for cooperating with the supporting traction roller (9) to achieve tension isolation; The B-surface film area coating die head (3) is provided with a supporting traction roller (9) opposite thereto. The B-surface film area coating die head (3) is used to coat the foil film area of ​​the B-surface (7) of the electrode plate located on the supporting traction roller (9). A rubber pressure roller (8) is provided upstream of the B-surface film area coating die head (3) and cooperates with the supporting traction roller (9) to achieve tension isolation.

4. A double-sided coating device according to claim 1, characterized in that: It also includes a traction device (5), which is arranged downstream of the heating and drying device (4) and upstream of the B-face film area coating die (3) and is used to straighten the electrode.

5. A double-sided coating device according to claim 4, characterized in that: The traction device (5) is a traction roller.

6. A double-sided coating device according to claim 5, characterized in that: A plurality of traction rollers are arranged along the conveying direction of the pole piece.

7. A double-sided coating device according to claim 1, characterized in that: The heating and drying device (4) is an oven.

8. A double-sided coating device according to claim 7, characterized in that: The oven comprises an upper air inlet and a lower air inlet, and the pole piece is suspended between the upper air inlet and the lower air inlet.

9. A double-sided coating device according to claim 1, characterized in that: It also includes a deviation correction device, which is arranged downstream of the heating and drying device (4) and upstream of the B-face film zone coating die head (3).

10. The double-sided coating device according to claim 1, characterized in that: It also includes a weighing device, which is arranged downstream of the heating and drying device (4) and upstream of the coating die head (3) of the B-face film area.

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