CN218902502U

CN218902502U - Double-sided coating structure based on laser rapid drying

Info

Publication number: CN218902502U
Application number: CN202222701387.6U
Authority: CN
Inventors: 韩宇; 刘嘉兵; 周研; 张冬; 喻薛刚
Original assignee: Sichuan Jiatuo Intelligent Equipment Co ltd
Current assignee: Sichuan Jiatuo Intelligent Equipment Co ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-04-25
Anticipated expiration: 2032-10-13

Abstract

The utility model discloses a double-sided coating structure based on laser rapid drying, and relates to the technical field of pole piece processing; comprises a first coating die head, a second coating die head, a laser drying oven and a hot air drying oven; the first coating die head and the second coating die head are positioned on the same side of the laser drying oven, the first coating die head is used for coating one surface of the substrate, and the second coating die head is used for coating the other surface of the substrate; the laser drying oven is positioned at the rear of the second coating die head, the substrate subjected to double-sided coating enters the laser drying oven, and the substrate is subjected to double-sided drying through the laser drying oven; the hot air drying oven is arranged behind the laser drying oven, and the coating layer on the substrate is dried through the hot air drying oven; the beneficial effects of the utility model are as follows: the problems that a wet film contacts the roller surface of a roller are avoided through the introduced laser drying oven and the first coating die head and the second coating die head for double-sided coating, so that double-sided simultaneous coating is stably realized.

Description

Double-sided coating structure based on laser rapid drying

Technical Field

The utility model relates to the technical field of pole piece processing, in particular to a double-sided coating structure based on laser rapid drying.

Background

The existing lithium battery coating machine equipment adopts single-sided coating firstly when double-sided coating is adopted, and then carries out other-sided coating after drying, so that the occupied area is large and the drying efficiency is low. And when carrying out the second face drying, carry out the second drying to first face coating region, there is transition drying and the insufficient risk of second face drying, whole equipment cost is high, and can't satisfy the requirement that two-sided drying uniformity is high.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a double-sided coating structure based on laser rapid drying.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a double-sided coating structure based on laser rapid drying, which is improved in that the double-sided coating structure comprises a first coating die head, a second coating die head, a laser drying oven and a hot air drying oven;

the first coating die head and the second coating die head are positioned on the same side of the laser drying oven, the first coating die head is used for coating one surface of the substrate, and the second coating die head is used for coating the other surface of the substrate;

the laser drying oven is positioned at the rear of the second coating die head, the substrate subjected to double-sided coating enters the laser drying oven, and the substrate is subjected to double-sided drying through the laser drying oven;

the hot air drying oven is arranged behind the laser drying oven, and the coating layer on the substrate is dried through the hot air drying oven.

In the above structure, an adjusting roller is disposed between the first coating die and the second coating die, and the adjusting roller contacts with the other surface of the substrate, so as to reduce the suspension distance of the substrate at the second die.

In the above structure, a back roller is disposed at one side of the first coating die, and the substrate passes through between the back roller and the first coating die.

In the structure, the included angle between the base material and the horizontal plane is 0-90 degrees after the base material passes through the space between the first coating die head and the back roller.

In the structure, the included angle between the base material and the horizontal plane is 60 degrees after the base material passes through the space between the first coating die head and the back roller.

In the structure, one side of the back roller is also provided with a glue pressing roller, and the base material passes through the space between the glue pressing roller and the back roller.

In the structure, the included angle between the laser drying oven and the horizontal plane is 0-90 degrees, and the length range of the laser drying oven is 0.5-6m.

In the above structure, the inlet and outlet of the laser drying oven are provided with a temperature sensor and a humidity sensor, the surface temperature of the base material is detected by the temperature sensor, and the humidity sensor detects the humidity of the gas in the laser drying oven.

In the structure, the hot air drying oven comprises an upper hull and a lower hull, wherein air inlets are formed in the upper hull and the lower hull, and air nozzles facing to the base materials are formed in the upper hull and the lower hull.

The beneficial effects of the utility model are as follows: compared with the traditional coating machine, the utility model avoids the problem that a wet film contacts the roller surface by the introduced laser drying oven and the first coating die head and the second coating die head for double-sided coating, and ensures that the double-sided simultaneous coating is stably realized.

Drawings

Fig. 1 is a schematic process flow diagram of a laser fast drying-based double-sided coating process according to the present utility model.

Fig. 2 is a diagram of a first embodiment of a laser-based rapid drying dual sided coating structure according to the present utility model.

FIG. 3 is a diagram of a second coating die and substrate according to an embodiment of the present utility model.

Fig. 4 is a diagram of a second embodiment of a laser-based rapid drying dual sided coating structure according to the present utility model.

Fig. 5 is a diagram of a third embodiment of a laser-based rapid drying dual sided coating structure according to the present utility model.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.

Referring to fig. 1 and 2, the utility model discloses a double-sided coating process based on laser rapid drying, by which coating and curing of slurry on both sides of a substrate are completed. Specifically, the process comprises the following steps:

s10, unreeling the base material and adjusting the tension, wherein after the base material is unreeled by the unreeling mechanism, the tension is adjusted by a tension roller, so that the tension of the base material is stabilized; since this step is common in the prior art, it will not be described in detail in this embodiment.

S20, single-sided coating of a substrate, wherein the substrate bypasses a first coating die head 10, and the slurry is coated on one surface of the substrate through the first coating die head 10;

in this embodiment, a back roller 101 is disposed on one side of the first coating die 10, a glue press roller 102 is disposed on one side of the back roller 101, and the glue press roller 102 and the first coating die 10 are located on the same side of the back roller 101, and the glue press roller 102 presses the substrate 100 to perform tension isolation.

In addition, an adjusting roller 30 is disposed between the first coating die 10 and the second coating die 20, and the adjusting roller 30 contacts with the other surface of the substrate 100 to support the film at a small angle, so as to reduce the suspension distance of the substrate 100 at the second coating die 20, and facilitate the stabilization of the film at the die, and under normal conditions, the adjusting roller 30 may be omitted, and the substrate 100 may be supported by the coating back roller 101. The substrate 100, after passing between the first coating die 10 and the back roll 101, forms an angle with the horizontal plane, and the angle is 0-90 degrees; in this embodiment, the included angle is 60 °, so that the contact angle of the oven passing through the roller and the elevation angle of the second coating die 20 are more reasonable and the coating effect is better while the coating effect of the die 1 is ensured.

S30, coating the other side of the substrate 100, bypassing the substrate 100 from the second coating die head 20, coating the slurry on the other surface of the substrate 100 through the second coating die head 20, realizing double-sided coating of the substrate 100, and forming coating layers on the upper surface and the lower surface of the substrate 100;

referring to fig. 3, in the present embodiment, the second coating die 20 includes an upper die lip 201 and a lower die 202 side by side to form a lower coating 1001 on the substrate 100; in order to ensure the coating effect, the second coating die 20 deflects at a certain angle to adjust the angle between the lip and the substrate 100, so that the coating is more stable, and specifically, the motor acceleration/deceleration machine can be used to rotate the die bottom plate at a certain angle, so as to drive the die lip and the substrate 100 to deflect at an angle.

S40, laser drying of the substrate 100, wherein the substrate 100 directly enters a laser drying oven 40 after passing through a second coating die head 20, and the front side and the back side of the substrate 100 are simultaneously heated and dried, so that a coating layer is baked from a fluid state to a semi-fluid state; in the laser drying oven 40, the pole piece is heated by laser, the water/NMP solvent is evaporated, and saturated steam is taken away by exhaust air by heating fresh air/not heating fresh air.

In this embodiment, an air inlet 401 and an air outlet 402 are provided on the laser drying oven 40, the laser system in the laser drying oven 40 irradiates the substrate 100 to heat the substrate 100, and the generated steam is taken away by air convection of the air inlet 401 and the air outlet 402. In addition, a temperature sensor 403 and a humidity sensor are arranged at the air inlet 401 and the air outlet 402, the temperature sensor 403 detects the surface temperature of the substrate 100, and the controller adjusts the laser power of the laser system 404 to ensure that the temperature of the substrate 100 is stabilized in a certain range, so that the pole piece is not burnt or the non-drying pole piece is not baked; humidity transducer detects the humidity of the interior gaseous of oven, through the controller, adjusts exhaust fan's amount of wind, makes the interior steam of oven stabilize in a certain limit, and wherein exhaust fan's amount of wind manually sets up an upper and lower limit safe value, prevents that the interior gaseous velocity of flow of oven from being too fast, causes substrate 100 shake in the box, does not take place the shake when guaranteeing the pole piece coating.

Referring to fig. 2, it can be seen that after the substrate 100 is coated through the second coating die 20, the substrate 100 directly enters the laser drying oven 40, and there is no roller for supporting the substrate 100 between the second coating die 20 and the laser drying oven 40.

Under the condition of coating speed of 40m/min, the film can be baked to 50% by adopting a laser drying oven for 2.5m, and at the moment, the film can contact the roller to isolate shaking generated at the floating oven, and the length of the floating oven can be controlled to be about 20 m, so that the length of the floating oven is greatly reduced compared with that of a traditional oven.

And S50, hot air drying the substrate 100, wherein the substrate 100 enters a hot air drying oven 50, and the semi-fluid coating layer is baked by the hot air drying oven 50.

In the embodiment, in step S50, the hot air drying oven 50 includes an upper hull 501 and a lower hull 502, air inlets 503 are provided on the upper hull 501 and the lower hull 502, and air nozzles 504 facing the substrate 100 are provided on the upper hull 501 and the lower hull 502.

In step S40, the coating layer is baked from the fluid state to the semi-fluid state by the laser drying oven 40, and a roller 60 may be added at the inlet of the hot air drying oven 50, and the roller 60 may support the substrate 100. It should be noted that the laser drying oven 40 is not limited to the hot air drying oven 50, and a floating oven, or a drying cylinder may be used. In addition, the angle between the laser drying oven 40 and the horizontal plane is in the range of 0-90 °, and in the embodiment shown in fig. 2, the angle between the laser drying oven 40 and the horizontal plane is 30 °.

In this embodiment, the first coating die 10 and the second coating die 20 are adjusted by driving the dies to advance and retract by using an air cylinder, and controlling the wedges to move up and down by a motor reducer, so as to adjust the distance between the dies and the coating roller or between the dies and the substrate 100.

In the prior art, the double-sided coating process based on laser rapid drying is characterized in that firstly, after the second side is coated, the coating is fed into a full-floating oven, and the upper and lower shaking of a diaphragm is caused due to the non-uniformity of air outlet of a tuyere in the floating oven, so that the shaking of a base material when the second side is driven to be coated, the gap between a lip of a lower die head and the base material is changed, the thickness of the coating is changed, the fluctuation of the thickness of the coating is caused, and the uniformity requirement cannot be met. Secondly, the full-floating oven that the level was placed, after two-sided coating, the first dry is the surface of wet film, then carries out the drying to wet film inside, and drying rate control requirement is high, can not carry out quick drying, because the second face is dry in the substrate bottom, and the steam after the drying can't be like to upper surface drying, volatilize fast upwards, leads to substrate both sides drying rate inconsistent, hardly guarantees the uniformity of coating layer nature after the both sides are dried.

Finally, after the double-sided coating, the two sides of the substrate are wet films and cannot be supported through the roller surfaces, the roller is used for supporting the pole piece after the long floating drying oven is needed due to the drying characteristic of the full floating drying oven, the distance between the second-sided coating die head and the roller is long due to the drying principle of the full floating drying oven, and the film is easy to shake up and down due to the fluctuation of tension, so that the thickness of the second-sided coating is more uneven and the requirement of the double-sided coating cannot be met.

In the embodiment, when the laser drying oven is adopted, as the floating tuyere is not adopted, the problem of diaphragm shaking caused by wind outlet of the tuyere is avoided. The substrate at the coating position of the second surface die head stably runs, the distance between the die lip and the substrate is not changed, and the uniformity of the coating layer during the second surface coating can be ensured. The same effect as in the first side coating is achieved. The mode that adopts big backing roll to add the rubber roll when first face coating, the tension fluctuation that the isolated unreels, substrate and horizontal contained angle adopt relatively great inclination after the coating, are usually 10-90 inclination, through big inclination, incline drying oven, be favorable to wet film's rapid draing to and the uniformity of substrate both sides drying rate, this inclination is 30 in this embodiment, can guarantee that both sides drying rate is unanimous basically, the problem of horizontal showy oven substrate both sides drying rate is solved basically, can guarantee again that whole equipment volume is not too high. In order to match the inclination angle of the laser drying oven, the first side coating die head can be inclined at a certain angle, usually 0-60 degrees, preferably the die head is horizontally arranged, and the inclination angle between the substrate and the horizontal after exiting the back roller is 60 degrees.

In addition, when a high-power laser drying oven is adopted, the distance from the second surface die head to the roller supporting position is greatly reduced due to the ultra-fast speed of laser drying wet films, and the humidity of the dried pole piece can be more than 50% within the common range of 0.5-6 m; in this embodiment, the length of the laser drying oven is 2.5m, wherein when the coating rate is 40m/min, the 2.5m laser drying oven can dry more than 50% of the solvent of the pole piece, so that the problem of instability of the distance between the lip of the die head and the substrate caused by the problem of suspending the diaphragm at a super distance can be avoided when the second surface is coated, and the problem of instability of the coating of the second surface is further caused. And a high-power laser drying oven is adopted, and the drying characteristic of the high-power laser drying oven is that the high-power laser drying oven is uniformly dried from inside to outside, so that the problem of internal stress caused by drying from outside to inside is avoided, and the mechanical property of the pole piece is improved.

As shown in fig. 5, another embodiment of the present utility model is provided, which is different from the embodiment shown in fig. 2 in that: no leveling roll is provided between the first coating die 10 and the second coating die 20, so that the angle between the substrate and the horizontal plane after passing through the second coating die 20 is still 60 °; and the substrate directly enters the laser drying oven 40, at the moment, the included angle between the laser drying oven 40 and the horizontal plane is 60 degrees, and the drying oven is inclined through a large inclination angle, so that the rapid drying of a wet film and the consistency of drying rates at two sides of the substrate are facilitated. The rest of the structure is identical to the embodiment shown in fig. 2, and will not be described in detail in this embodiment.

According to the double-sided coating process based on laser rapid drying, one side of a substrate 100 is coated by a first coating die head 10, the other side of the substrate 100 is coated by a second coating die head 20, then the substrate 100 is dried on both sides through a laser drying oven 40, a fluid state of a coating layer is baked to a semi-dry state in the laser drying oven 40, and then a pole piece in the semi-dry state is baked in a hot air drying oven 50. Therefore, compared with the conventional coater, the present utility model avoids the wet film contact roll surface passing problem by the introduced laser drying oven 40 and the first and second coating dies 10 and 20 for double-sided coating, enables the double-sided simultaneous coating to be stably realized, and eliminates the film shaking problem caused by the conventional hot air drying oven 50.

The present utility model also provides a double-sided coating structure based on laser rapid drying, and in combination with fig. 4, the present utility model provides a specific embodiment, in this embodiment, the double-sided coating structure based on laser rapid drying includes a first coating die 10, a second coating die 20, a laser drying oven 40, and a hot air drying oven 50; wherein the first coating die 10 and the second coating die 20 are positioned on the same side of the laser drying oven 40, the first coating die 10 coats one surface of the substrate 100, and the second coating die 20 coats the other surface of the substrate 100; in this embodiment, a regulating roller 30 is disposed between the first coating die 10 and the second coating die 20, and the regulating roller 30 contacts with the other surface of the substrate 100, so as to reduce the suspension distance of the substrate 100 at the second die. A back roll 101 is provided on one side of the first coating die 10, and the substrate 100 passes between the back roll 101 and the first coating die 10; the angle between the substrate 100 passing through the first coating die head 10 and the horizontal plane is 60 degrees; in addition, a glue press roller 102 is further disposed on one side of the back roller 101, and the substrate 100 passes between the glue press roller 102 and the back roller 101.

In the embodiment shown in fig. 4, the laser-based rapid drying double-sided coating structure further includes an unwind roller 70 and a tension adjusting roller 80, and the substrate 100 is wound around the unwind roller 70 and sequentially passes through the tension adjusting rollers 80; this part of the structure is mature in the prior art and will not be described in detail in this embodiment.

Further, the laser drying oven 40 is located at the rear of the second coating die 20, the substrate 100 with double-sided coating enters the laser drying oven 40, and the substrate 100 is dried on both sides by the laser drying oven 40; in this embodiment, the inlet and outlet of the laser drying oven 40 are respectively provided with a temperature sensor 403 and a humidity sensor, the temperature sensor 403 detects the surface temperature of the substrate 100, and the humidity sensor detects the humidity of the gas in the laser drying oven 40. The laser system 404 irradiates the surface of the pole piece, heats the pole piece, evaporates the steam, takes away the steam through the convection of the air inlet 401 and the air outlet 402, and takes the steam from the air inlet 401, and the air outlet 402 takes away the steam evaporated from the pole piece, so that the pole piece is quickly dried, the flow rate of the air in the box body can be controlled by controlling the gate of the air inlet and outlet 402, the pole piece is prevented from shaking when being coated, the temperature sensor 403 is arranged in the laser drying box, the closed-loop control is carried out with the laser system 404, and the pole piece is prevented from being too high in temperature and being baked.

In addition, the hot air drying oven 50 is disposed behind the laser drying oven 40, and the coating layer on the substrate 100 is dried by the hot air drying oven 50. In particular applications, a side-by-side arrangement of hot air drying ovens 50 may be selected. With respect to the structure of the hot air drying oven 50, as shown in fig. 4, the hot air drying oven 50 includes an upper hull 501 and a lower hull 502, the upper hull 501 and the lower hull 502 are respectively provided with an air inlet 401 and an air outlet 402, and the upper hull 501 and the lower hull 502 are respectively provided with a tuyere facing the substrate 100; the hot air passes through the hull to the tuyere, from which it is blown out to dry the membrane, and then the hot air with steam is discharged out of the box at the air outlet 402.

After the hot air drying oven 50, there are further provided a passing roller 901, a tension adjusting roller 902, a pulling roller 903, a glue roller 904, a tension adjusting mechanism 905 and a wind-up roller 906, and the structure thereof is common in the prior art, so that the detailed description thereof will not be given in this embodiment. It should be noted that, after the laser drying oven 40, the drying oven is not limited to the hot air drying oven 50, for example, a floating oven, or a drying cylinder may be used; those skilled in the art can choose according to the actual needs.

While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims

1. The double-sided coating structure based on laser rapid drying is characterized by comprising a first coating die head, a second coating die head, a laser drying oven and a hot air drying oven;

2. The laser rapid drying-based double-sided coating structure according to claim 1, wherein a regulating roller is disposed between the first coating die and the second coating die, and the regulating roller contacts with the other surface of the substrate to reduce the suspension distance of the substrate at the second die.

3. The laser quick drying based double sided coating structure of claim 1, wherein a back roll is disposed on one side of the first coating die, and the substrate passes between the back roll and the first coating die.

4. A laser flash-drying based duplex coating structure as in claim 3, wherein the substrate is at an angle of 0 ° to 90 ° to the horizontal after passing between the first coating die and the backing roll.

5. The laser flash drying based duplex coating architecture as recited in claim 4, wherein the substrate is at an angle of 60 ° to the horizontal after passing between the first coating die and the backing roll.

6. A laser fast drying based double sided coating structure according to claim 3, wherein one side of the back roller is further provided with a glue roller, and the substrate passes between the glue roller and the back roller.

7. The laser quick drying-based double-sided coating structure according to claim 1, wherein the included angle between the laser drying oven and the horizontal plane is 0-90 degrees, and the length of the laser drying oven is 0.5-6m.

8. The laser quick drying-based double-sided coating structure according to claim 1, wherein the inlet and the outlet of the laser drying oven are respectively provided with a temperature sensor and a humidity sensor, the surface temperature of the substrate is detected by the temperature sensor, and the humidity of the gas in the laser drying oven is detected by the humidity sensor.

9. The laser quick drying-based double-sided coating structure according to claim 1, wherein the hot air drying oven comprises an upper hull and a lower hull, air inlets are formed in the upper hull and the lower hull, and air nozzles facing to the base material are formed in the upper hull and the lower hull.