Extrusion die head device suitable for coating and coating equipment

Abstract

The utility model relates to the field of lithium ion battery preparation, and discloses an extrusion die head device suitable for coating and coating equipment. The extrusion die head device comprises at least one platform base and at least two extrusion die heads, a plurality of parallel guide rail mechanisms are arranged on the platform base, sliding blocks are fixed to the extrusion die heads respectively, the sliding blocks of the different extrusion die heads are connected to the different guide rail mechanisms respectively, and the guide rail mechanisms are arranged on the platform base. And each sliding block can slide along the corresponding guide rail mechanism to drive each extrusion die head to translate. By applying the technical scheme, the coating efficiency is improved, and the energy consumption of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the field of lithium-ion battery preparation, in particular to a lithium-ion battery charging and discharging device and system. Background Art

[0002] With the increasing attention of people to energy and environmental protection, the application of lithium-ion batteries is becoming more and more extensive. A lithium-ion battery includes a positive electrode sheet, a negative electrode sheet and a separator. Among them, both the positive electrode sheet and the negative electrode sheet are made by a coating process. Specifically, a polar active material slurry is coated on the surface of a substrate by an extrusion die head device of a coating device to form a polar active material layer on the surface of the substrate.

[0003] The coating process is the most critical link in the production of lithium-ion batteries. At present, the extrusion coating process is widely used in the industry for slurry coating operations. Extrusion coating specifically means that a certain flow rate of slurry enters the internal cavity of the extrusion die head from the feed port of the extrusion die head, the feeding is controlled to form a stable pressure, and the slurry sprays out at a uniform speed at the die head slit outlet and is coated on the foil. The extrusion die head is a key component in the coating machine, which can very precisely control the coating thickness and width, is suitable for continuous large-scale production, has a fast production speed and high efficiency, and helps to reduce the unit cost.

[0004] In the process of researching the present utility model, the inventor found that with the increasingly wide application of lithium-ion batteries in consumer electronics products, the specification requirements of consumer batteries are becoming more and more diverse, and consumer battery manufacturers need to adapt to the diversified needs of customer products. There is a general situation in consumer battery manufacturers that the order quantity of a single model is small and there are many product models.

[0005] However, the extrusion die head on the existing coating machine can only meet one surface density coating each time. Manufacturers often need to adjust the coating parameters of the extrusion die head device to adapt to different products, and it often takes a long time to debug to reach the optimal state, which affects the production efficiency. Summary of the Invention

[0006] One of the purposes of the embodiments of the present utility model is to provide an extrusion die head device suitable for coating and a coating device. Applying this technical solution is beneficial to improving the coating efficiency and reducing the energy consumption of the device.

[0007] In a first aspect, the embodiments of the present utility model provide an extrusion die head device suitable for coating, including: a platform base, at least two extrusion die heads,

[0008] A plurality of rail mechanisms parallel to each other are arranged on the platform base,

[0009] Sliders are respectively fixed on each of the extrusion dies, and the sliders of different extrusion dies are respectively connected to different guide rail mechanisms. Each slider can slide along the guide rail mechanism where it is located, driving each extrusion die to translate.

[0010] Optionally, it includes two extrusion dies, and there are two sliders at the bottom of each extrusion die.

[0011] Four guide rail mechanisms are arranged in parallel on the platform base.

[0012] The two sliders of one extrusion die are limited on two guide rail mechanisms, and the two sliders of the other extrusion die are limited on the other two guide rail mechanisms.

[0013] Optionally, screw holes are respectively provided on each slider, and the extending direction of each screw hole is parallel to the guide rail mechanism.

[0014] Adjusting screw rods are respectively screwed in each screw hole.

[0015] Optionally, it further includes:

[0016] A plurality of servo motors, and one servo motor is respectively connected to the end part of each adjusting screw rod.

[0017] Optionally, columnar curved surfaces that match each other are respectively provided on the top surface of each guide rail mechanism and the bottom surface of each slider.

[0018] When each extrusion die is installed on the top surface of each guide rail mechanism, the top surface of the guide rail mechanism and the columnar curved surface opposite to the bottom surface of the slider are in contact, and the columnar curved surface of the slider can axially slide along the columnar curved surface of the guide rail mechanism, driving the extrusion die to translate.

[0019] Optionally, the columnar curved surface provided on the top surface of each guide rail mechanism is a curved surface groove, and the columnar curved surface provided on the top surface of each guide rail mechanism is a columnar protrusion that matches the curved surface groove. The columnar protrusion is parallel to the curved surface groove.

[0020] When each extrusion die is installed on the top surface of each guide rail mechanism, each columnar protrusion is respectively limited in each curved surface groove, and the curved surfaces are in contact.

[0021] Optionally, plane top surfaces with the same length as the curved surface groove are respectively provided on both sides of the curved surface groove of each guide rail mechanism.

[0022] Plane bottom surfaces with the same length as the columnar protrusion are respectively provided on both sides of the columnar protrusion of each guide rail mechanism.

[0023] When each of the extrusion die heads is installed on the top surface of each of the guide rail mechanisms, the two plane bottoms on both sides of each cylindrical protrusion are respectively in contact with the two plane tops on both sides of each curved groove.

[0024] Optionally, the feed ports of each extrusion die head are independent and are respectively arranged at the ends opposite to the slit outlets of the extrusion die head where they are located, and are communicated with the cavities in the extrusion die head through an upwardly extending material pipe.

[0025] In a second aspect, a coating device provided by an embodiment of the present invention includes:

[0026] Any one of the above extrusion die head devices applicable to coating,

[0027] A coating roller, having a cylindrical shape, with its axis facing and parallel to the slit outlets of the plurality of extrusion die heads of the extrusion die head device, and having a gap between the outer periphery of the coating roller and the slit outlets of each extrusion die head to drive the substrate to be coated through the gap.

[0028] Optionally, the distances between the slit outlets of at least two extrusion die heads and the coating roller are different.

[0029] As can be seen from the above, when applied to the production of lithium-ion batteries, by using the extrusion die head device with multiple extrusion die heads in this embodiment, each extrusion die head is independent. Users can respectively adjust the gap between the slit outlet of the extrusion die head and the surface of the substrate on the coating roller by translating the slider at the bottom of each extrusion die head along the slide rail mechanism where it is located, and respectively adjust the feeding amount and feeding flow rate of the feed port of each extrusion die head to control the coating surface density obtained by the current extrusion die head coating. So that in one coating process, each extrusion die head feeds according to the feeding parameters required for its respective desired surface density, and multiple types of coated specifications of electrode sheets can be obtained on one substrate at the same time, realizing the simultaneous production of electrode sheets with multiple surface densities. It is beneficial to improve production efficiency, reduce equipment energy consumption, and reduce the frequency of product model change and debugging equipment and the waste of debugging raw materials. Description of the Drawings

[0030] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application, without unduly limiting the present invention.

[0031] Figure 1 It is the first three-dimensional structure schematic diagram of the extrusion die head device applicable to coating provided by Embodiment 1 of the present invention;

[0032] Figure 2 It is the second three-dimensional structure schematic diagram of the extrusion die head device applicable to coating provided by Embodiment 1 of the present invention;

[0033] Figure 3The third three-dimensional schematic diagram of the structure of the extrusion die head device suitable for coating provided in the first embodiment of the present utility model;

[0034] Figure 4 The fourth three-dimensional schematic diagram of the structure of the extrusion die head device suitable for coating provided in the first embodiment of the present utility model;

[0035] Figure 5 The fifth three-dimensional schematic diagram of the structure of the extrusion die head device suitable for coating provided in the first embodiment of the present utility model.

[0036] 1: Extrusion die head; 11: Upper die; 12: Lower die; 13: Outlet; 14: Feed inlet;

[0037] 2: Platform base; 3: Guide rail mechanism; 31: Curved groove; 32: Flat top surface;

[0038] 4: Slide block; 41: Cylindrical protrusion; 42: Flat bottom surface 5: Coating roller;

[0039] 6: Substrate; 7: Adjusting screw rod; 8: Servo motor; 9: Coating layer. Detailed implementation manners

[0040] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Here, the illustrative embodiments of the present utility model and the descriptions are used to explain the present utility model, but not to limit the present utility model. Embodiment

[0041] See Figures 1 - 5 Shown.

[0042] This embodiment provides an extrusion die head 1 device suitable for coating, which mainly includes: a platform base 2 and two or more extrusion die heads 1 provided on the platform base 2.

[0043] The extrusion die head 1 includes three parts: an upper die 11, a lower die 12, and a gasket (not shown in the figure, reference can be made to the prior art). The upper die 11 is fixed on the upper die 11, and the lower die 12 and the gasket are firmly fixed together with the upper die 11 by bolts. A cavity for controlling the flow field (including flow direction and flow rate) of the slurry is provided in the lower die 12, and a slit outlet 13 communicating with the cavity is provided at the front end. The gasket is provided between the upper die 11 and the lower die 12, and the gasket closes the cavity from above to adjust the flow field of the slurry in the cavity. The slurry flows out from the slit outlet 13 at a predetermined flow rate. Different gaskets can be selected according to different coating widths, coating shapes, and coating surface densities during application.

[0044] The further detailed structure of the extrusion die head 1 can but is not limited to referring to the prior art.

[0045] A plurality of parallel guide rail mechanisms 3 are provided on the platform base 2. Hereinafter, taking the installation of the guide rail mechanism 3 on the top of the platform base 2 as an example.

[0046] Sliders 4 are respectively provided at the bottom of each extrusion die head 1, where the sliders 4 can be, but are not limited to, fixedly installed at the bottom of the extrusion die head 1, or can be an integral structure with the extrusion die head 1.

[0047] Each extrusion die head 1 installed on the top of the platform base 2 is independent of each other. Each extrusion die head 1 is respectively installed on different guide rail mechanisms 3. Specifically, the sliders 4 at the bottom of each extrusion die head 1 are respectively connected to the guide rail mechanism 3 where the extrusion die head 1 is located. Each extrusion die head 1 moves forward or backward along the guide rail mechanism 3 where it is located with the slider 4 at its bottom to adjust the distance between the slit outlet 13 of the extrusion die head 1 and the surface of the substrate 6 to be coated.

[0048] During application, the extrusion die head 1 device of this embodiment is installed on the coating equipment so that the slit outlets 13 of each extrusion die head 1 are directly opposite to the coating roller 5 of the coating equipment.

[0049] The outer shape of the coating roller 5 is cylindrical. The slit outlets 13 of each extrusion die head 1 are parallel to the axial direction of the coating roller 5, and the slit outlets 13 of each extrusion die head 1 are parallel to the axial direction of the coating roller 5. The axial length of the coating roller 5 is wider than the two ends of the slit outlets 13 of the outermost two extrusion die heads 1. During coating, the coating roller 5 rotates at a constant speed, and the substrate 6 passes in front of the slit outlets 13 of the extrusion die heads 1 at a constant speed. The slurry flows out from each slit outlet 13 at a uniform speed and is coated on the surface of the substrate 6 on the coating roller 5 to form a coating layer 9. The coating roller 5 drives the substrate 6 to move relative to the slit outlets 13, driving the slurry coated on the surface of the substrate 6 to realize continuous coating of the substrate 6.

[0050] Applied to the production of lithium-ion batteries, using the extrusion die head 1 device equipped with a plurality of extrusion die heads 1 of this embodiment, each extrusion die head 1 is independent. Users can respectively adjust the gap between the slit outlet 13 of the extrusion die head 1 and the surface of the substrate 6 on the coating roller 5 by translating the slider 4 at the bottom of each extrusion die head 1 along the sliding rail mechanism where it is located, and respectively adjust the feeding amount and feeding flow rate of the feeding port 14 of each extrusion die head 1 to control the coating surface density obtained by the current extrusion die head 1 coating. So that in a coating process, each extrusion die head 1 feeds according to the feeding parameters required for its respective desired surface density, and multiple types of coated specifications of electrode sheets can be obtained on a substrate 6 at the same time, realizing the simultaneous production of electrode sheets with multiple surface densities. It is beneficial to improve production efficiency, reduce equipment energy consumption, and reduce the frequency of product model change and debugging of the equipment and the waste of debugging raw materials.

[0051] As an illustration of this embodiment, a plurality of traction rollers, deviation rectifying units, and adjusting rollers parallel to the coating roller 5 are further provided on the coating equipment. The base material 6 is unrolled from the unrolling unit, passes through the traction rollers, and at the coating roller 5, the plurality of extrusion dies 1 in this embodiment respectively coat its surface. After coating, a pole piece with a plurality of coating areas on its surface is obtained. The pole piece continues to move forward under the action of the traction rollers, and is obtained after drying in the baking chamber. The user cuts each coating area to obtain pole pieces with different coating parameters, realizing obtaining multiple types of pole pieces simultaneously in the same coating process. Among them, for the specific structures of the traction rollers, deviation rectifying units, and adjusting rollers, reference can be made to the prior art.

[0052] During the transmission of the pole piece, the traction rollers drive the movement of the base material 6 (and the pole piece after coating), and eliminate the internal stress of the base material 6 to improve the flatness of the base material 6, thereby improving the uniformity of the coating surface density. During the transmission process, the deviation rectifying unit performs on-line deviation rectifying detection on the transmission of the base material 6 and the pole piece, and the control unit controls the adjustment of the adjusting rollers in real time according to the detection of the deviation rectifying unit to ensure the position of the base material 6 (or the pole piece after coating) during the transmission process, and ensure its flatness and uniformity.

[0053] The illustration of this embodiment takes the setting of two extrusion dies 1 on the platform base 2 as an example, but it is not limited to this in reality. Based on the principle of this embodiment, three, four or more parallel extrusion dies 1 can be set on a platform base 2 to synchronously process pole pieces with three, four or more coating specifications. The principle is the same as that of this embodiment, and will not be elaborated here.

[0054] As an illustration of this embodiment, taking the setting of two extrusion dies 1 on a platform base 2 as an example, correspondingly, four guide rail mechanisms 3 parallel to each other are arranged on the top of the platform base 2. At the bottom of each extrusion die 1, a slider 4 with a certain length is fixed. The length direction of the slider 4 is the same as the guide rail direction of the guide rail mechanism 3. One extrusion die 1 corresponds to two adjacent guide rail mechanisms 3, and the other extrusion module corresponds to the other two adjacent guide rail mechanisms 3. Each slider 4 of each extrusion die 1 is respectively limited on a guide rail mechanism 3, so that each slider 4 can slide along the guide rail mechanism 3 on which it is limited. In this way, each extrusion die is respectively supported on two parallel guide rail mechanisms 3 at its bottom, and can maintain good balance and stability.

[0055] As an illustration of this embodiment, the opposite surfaces of the guide rail mechanisms 3 and the sliders 4 can be set as matching cylindrical curved surfaces, and the axial direction of the cylindrical curved surface is the direction of the guide rail. When the extrusion die is placed on the platform base 2, the opposite cylindrical curved surfaces between the slider 4 and the guide rail mechanism 3 are in contact. Under the action of the gravity of the extrusion die 1 device, the slider 4 can only move forward or backward along the cylindrical curved surface of its guide rail mechanism 3.

[0056] For example, a curved groove 31 with a semi-circular cross-section can be provided on the top surface of the guide rail mechanism 3. The opening of the curved groove 31 faces upward, and the groove length of the curved groove 31 is the length of the guide rail mechanism 3. A cylindrical protrusion 41 with a protrusion degree matching the curved groove 31 on the guide rail mechanism 3 is provided on the bottom surface of the slider 4. The cylindrical protrusion 41 has a certain length. During assembly, the cylindrical protrusion 41 of the slider 4 is completely limited within the curved groove 31 on the top surface of the guide rail mechanism 3. The two sliders 4 at the bottom of the extrusion die head 1 are respectively limited within the two curved grooves 31 on the top of the platform base 2, realizing the positioning of the extrusion die head 1. With this technical solution, the installation of the extrusion die head 1 is simple, facilitating the precise positioning of the extrusion die head 1 and being beneficial to improving the stability of the extrusion die head 1.

[0057] As a schematic illustration of this embodiment, the two sides of the guide rail mechanism 3 where the curved groove 31 is located can be further set as two flat top surfaces 32 with the same length as the curved groove 31. The two sides of the cylindrical protrusion 41 of the slider 4 at the bottom of the extrusion die head 1 are set as flat top surfaces 32 with the same length as the cylindrical protrusion 41. During matching, the cylindrical protrusion 41 of the slider 4 is limited within the curved groove 31 of the guide rail mechanism 3, and the flat top surfaces 32 on both sides of the curved groove 31 are in contact with the flat bottom surfaces 42 on both sides of the cylindrical protrusion 41. With this technical solution, it is beneficial to further limit the slider 4, avoid displacement, improve the precise positioning of the extrusion die head 1, and improve the stability of the extrusion die head 1.

[0058] As a schematic illustration of this embodiment, screw holes extending along the length direction of the slider 4 can be drilled on each slider 4. The extending direction of the screw holes is parallel to the guide rail mechanism 3, and adjusting screw rods 7 are respectively screwed into each screw hole. The user adjusts the forward or backward movement of the slider 4 along the guide rail by rotating the adjusting screw rod 7.

[0059] As a schematic illustration of this embodiment, a servo motor 8 is respectively connected to the end of the adjusting screw rod 7 of each slider 4. The servo motor 8 drives the adjusting screw rod 7 to drive the extrusion die head 1 to move forward or backward, realizing precise electric control.

[0060] As a schematic illustration of this embodiment, with the end where the slit outlet 13 is located as the front end, the feed inlet 14 of each extrusion die head 1 in this embodiment is arranged at the rear end of the lower die 12. Preferably, the feed inlet 14 is arranged at a horizontal position lower than the cavity in the lower die 12. Inside the lower die 12, the feed inlet 14 communicates with the cavity upward, realizing lower part feeding. Experiments prove that adopting the lower part feeding scheme is beneficial to improving the uniformity of the flow rate of the slurry.

[0061] In summary, in the preparation of lithium-ion batteries, especially in the preparation of electrode sheets for consumer lithium-ion batteries, adopting the technical solution of this embodiment is beneficial to improving the coating efficiency; reducing the frequency of machine adjustment due to battery type change, and reducing the waste of raw materials caused by machine adjustment.

[0062] The above-described embodiments do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the above embodiments shall be included within the protection scope of the technical solution.

Claims

1. An extrusion die head device suitable for coating, characterized in that, Comprising: A platform base and at least two extrusion dies, A plurality of guide rail mechanisms parallel to each other are provided on the platform base, Sliders are respectively fixed on each of the extrusion dies, and the sliders of different extrusion dies are respectively connected to different guide rail mechanisms. Each slider can slide along the guide rail mechanism where it is located, driving each extrusion die to translate.

2. The extrusion die device applicable to coating according to claim 1, characterized in that, It includes two of the extrusion dies, and there are two sliders at the bottom of each extrusion die, Four guide rail mechanisms parallel to each other are provided on the platform base, The two sliders of one extrusion die are limited on two of the guide rail mechanisms, and the two sliders of the other extrusion die are limited on the other two guide rail mechanisms.

3. The extrusion die device applicable to coating according to claim 1, characterized in that, Screw holes are respectively provided on each of the sliders, and the extending direction of each screw hole is parallel to the guide rail mechanism, Adjusting screw rods are respectively screwed in each of the screw holes.

4. The extrusion die head device applicable to coating according to claim 3, characterized in that it further Comprising: A plurality of servo motors, and one of the servo motors is respectively connected to the end of each adjusting screw rod.

5. The extrusion die device applicable to coating according to claim 2, characterized in that, Matched cylindrical surfaces are respectively provided on the top surfaces of each of the guide rail mechanisms and the bottom surfaces of each of the sliders, When each extrusion die is installed on the top surface of each guide rail mechanism, the top surface of the guide rail mechanism and the cylindrical surface opposite to the bottom surface of the slider are in contact. The cylindrical surface of the slider can slide axially along the cylindrical surface of the guide rail mechanism, driving the extrusion die to translate.

6. The extrusion die device applicable to coating according to claim 5, characterized in that, The cylindrical surface provided on the top surface of each of the guide rail mechanisms is a curved groove, The cylindrical surface provided on the top surface of each of the guide rail mechanisms is a cylindrical protrusion matching the curved groove, and the cylindrical protrusion is parallel to the curved groove, When each extrusion die is installed on the top surface of each guide rail mechanism, each cylindrical protrusion is respectively limited in each curved groove, and the curved surfaces are in contact.

7. The extrusion die device applicable to coating according to claim 6, characterized in that, Plane top surfaces of the same length as the curved groove are respectively provided on both sides of the curved groove of each of the guide rail mechanisms, Plane bottom surfaces of the same length as the cylindrical protrusion are respectively provided on both sides of the cylindrical protrusion of each of the guide rail mechanisms, When each extrusion die is installed on the top surface of each guide rail mechanism, the two plane bottom surfaces on both sides of each cylindrical protrusion and the two plane top surfaces on both sides of each curved groove are respectively in contact.

8. The extrusion die device applicable to coating according to claim 1, characterized in that, The feed ports of each extrusion die are independent of each other, and are respectively provided at the end opposite to the outlet of the extrusion die where it is located, and are communicated with the cavity in the extrusion die through an upward extending material pipe.

9. A coating device, characterized in that it includes: Any one of the extrusion die devices applicable to coating according to claims 1 to 8, The coating roller has a cylindrical shape, and its axis is directly opposite and parallel to the slit outlets of the plurality of extrusion dies of the extrusion die head device. There is a gap between the outer circumference of the coating roller and the slit outlets of each extrusion die to drive the substrate to be coated through the gap.

10. The coating equipment according to claim 9, wherein the distances between the slit outlets of at least two of the extrusion dies and the coating roller are different.

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