CN116353200A

CN116353200A - Battery pole piece drying system

Info

Publication number: CN116353200A
Application number: CN202310639348.4A
Authority: CN
Inventors: 邹海天; 王德才; 徐亚兵; 丁桐桐; 刘宗明; 顾鑫; 付强; 周德鹏
Original assignee: Hymson Laser Technology Group Co Ltd
Current assignee: Hymson Laser Technology Group Co Ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-06-30
Anticipated expiration: 2043-06-01
Also published as: CN116353200B

Abstract

The application relates to a battery pole piece drying system includes preliminary stoving unit and degree of depth stoving unit, and wherein preliminary stoving unit includes a plurality of waste heat recovery ovens that follow the direction of tape running of waiting to dry the diaphragm and arrange at intervals in proper order, and waste heat recovery ovens have and are used for supplying to wait to dry the first drying chamber that the diaphragm passed. The deep drying unit comprises a plurality of deep drying ovens which are sequentially arranged at intervals along the travelling direction of the film to be dried, the deep drying ovens are provided with second drying chambers for the film to be dried to pass through, and the preliminary drying unit is positioned at the upstream of the deep drying unit in the travelling direction of the film to be dried. The waste heat recovery oven and the deep drying oven are combined, so that the drying requirement can be met by utilizing a small number of ovens, the manufacturing cost of equipment is reduced, and the occupied area is reduced.

Description

Battery pole piece drying system

Technical Field

The application relates to the technical field of coating printing equipment, in particular to a battery pole piece drying system.

Background

The drying oven is a main unit in the battery pole piece drying system, a plurality of drying ovens are sequentially arranged, and the membrane to be dried passes through each drying oven. For example, in the manufacturing process of the battery pole piece, a drying step is needed to be carried out on the pole piece by using a whole-line drying system. The more ovens the system contains, the more hot air needs to be provided. In general, a large number of ovens are required to be arranged in order to achieve the drying purpose, and the conditions of high manufacturing cost and large occupied area exist.

Disclosure of Invention

Based on this, it is necessary to provide a battery pole piece drying system, which combines two types of ovens, namely a waste heat recovery oven and a deep drying oven, aiming at the problems of high manufacturing cost and large occupied area of the whole line drying system, so that the drying requirement can be finished by using a small number of ovens, the manufacturing cost of equipment is reduced, and the occupied area is reduced.

A battery pole piece drying system comprising:

the primary drying unit comprises a plurality of waste heat recovery ovens which are sequentially arranged at intervals along the tape moving direction of the film to be dried, wherein the waste heat recovery ovens are provided with first drying chambers for the film to be dried to pass through, and the waste heat recovery ovens are also provided with waste heat recovery modules which are used for exchanging heat of hot air after the film to be dried is baked in the first drying chambers to fresh air entering the first drying chambers;

the deep drying unit comprises a plurality of deep drying ovens which are sequentially arranged at intervals along the travelling direction of the film to be dried, wherein the deep drying ovens are provided with second drying chambers for the film to be dried to pass through, the deep drying ovens are also provided with drying guide units arranged in the second drying chambers, the drying guide units are used for guiding the film to be dried in the second drying chambers to move forward along a winding path, and the preliminary drying units are positioned at the upstream of the deep drying units in the travelling direction of the film to be dried.

In one embodiment, the waste heat recovery module comprises a first fresh air pipeline, an exhaust pipeline and a first heat exchanger, wherein a fresh air inlet of the first fresh air pipeline is communicated with an external space of the waste heat recovery oven, a fresh air outlet of the first fresh air pipeline is communicated with the first drying chamber, an exhaust inlet of the exhaust pipeline is communicated with the first drying chamber, an exhaust outlet of the exhaust pipeline is communicated with the external space of the waste heat recovery oven, and the first fresh air pipeline and the exhaust pipeline both pass through the first heat exchanger, so that heat of hot air in the exhaust pipeline can be exchanged for fresh air in the first fresh air pipeline;

the waste heat recovery oven further comprises a first exhaust fan, wherein the first exhaust fan is used for driving airflow in the exhaust pipeline to flow from the exhaust inlet to the exhaust outlet;

the waste heat recovery oven further comprises a first circulating fan, wherein the first circulating fan is used for driving air flow in the first fresh air pipeline to flow from the fresh air inlet to the fresh air outlet.

In one embodiment, the waste heat recovery oven further comprises a return air pipeline, the waste heat recovery oven is provided with a mixing chamber, the return air pipeline is communicated between the first drying chamber and the mixing chamber, a fresh air outlet of the first fresh air pipeline is communicated with the mixing chamber, the first circulating fan is further used for driving air flow in the return air pipeline to flow from the first drying chamber to the mixing chamber, and the mixing chamber is provided with a mixed air outlet which is communicated with the first drying chamber;

the pipeline communicated between the air mixing outlet and the first drying chamber is a heating pipeline, and a heating assembly is arranged on the heating pipeline.

In one embodiment, a plurality of winders and a plurality of lees are arranged in the first drying chamber, each winder is provided with an upper hull A communicated with the inner space of the winder, each lees is provided with a lower hull A communicated with the inner space of the winder, the upper hulls A and the lower hulls A are communicated with the air mixing outlet, the winders are sequentially and alternately arranged along the feeding direction of the film to be dried, the lees are sequentially and alternately arranged along the feeding direction of the film to be dried, all the winders are used for guiding hot air to blow to one side surface of the film to be dried, and all the lees are used for guiding hot air to blow to the other side surface of the film to be dried.

In one embodiment, the drying guiding unit comprises a plurality of air-float rollers and a plurality of main driving rollers which are all positioned in the second drying chamber, the main driving rollers are parallel to each other and are arranged at intervals, the spaced arrangement paths of the main driving rollers are first paths, two main driving rollers correspond to one air-float roller, the air-float rollers are parallel to the corresponding main driving rollers, all the air-float rollers are positioned on the same side of the first paths, a film to be dried can sequentially bypass the main driving rollers and the air-float rollers to advance according to a winding path, exhaust holes are formed in all the air-float rollers, and the air outlet directions of all the exhaust holes face the film to be dried which bypasses the air-float rollers.

In one embodiment, the first path is a straight path, the distance between each air-floating roller and the first path is equal, and each air-floating roller is arranged between two corresponding main driving rollers in a staggered manner.

In one embodiment, each two adjacent main driving rollers, the air floating roller corresponding to the two main driving rollers and the membrane to be dried positioned between the two main driving rollers together define a drying area, each drying area is provided with an air knife mechanism, the deep drying oven is further provided with an upper ship body B, and all the air knife mechanisms are communicated with the space in the upper ship body B.

In one embodiment, the deep drying oven further comprises a circulating air pipeline, an air outlet chamber communicated with the second drying chamber is further arranged in the deep drying oven, the circulating air pipeline is communicated between the air outlet chamber and the upper ship body B, a second circulating fan is arranged on the circulating air pipeline and used for driving air flow in the circulating air pipeline to flow from a position close to the air outlet chamber to a position close to the upper ship body B, a fresh air inlet is further arranged on the circulating air pipeline, the deep drying oven further comprises a second fresh air pipeline, a fresh air inlet of the second fresh air pipeline is communicated with an external space of the deep drying oven, and a fresh air outlet of the second fresh air pipeline is communicated with a fresh air inlet on the circulating air pipeline;

the deep drying oven further comprises a heat recovery pipeline and a second heat exchanger, one end of the heat recovery pipeline is communicated with the air outlet chamber, the other end of the heat recovery pipeline is communicated with the outer space of the deep drying oven, a second exhaust fan is arranged on the heat recovery pipeline and is used for driving air flow in the heat recovery pipeline to flow from a position close to the air outlet chamber to the outer space of the deep drying oven, and the heat recovery pipeline and the second fresh air pipeline pass through the second heat exchanger.

In one embodiment, the circulating air pipeline is further provided with a first heater and a first filter, the first heater is positioned downstream of the fresh air inlet on the circulating air pipeline in the airflow flowing direction in the circulating air pipeline, and the first filter is positioned downstream of the first heater;

and/or, the deep drying oven further comprises a total reflux pipe and a plurality of branch reflux pipes, wherein the total reflux pipe is communicated with the heat recovery pipeline, each branch reflux pipe is communicated with the total reflux pipe, one branch reflux pipe is correspondingly communicated with one air floating roller, each air floating roller is correspondingly provided with an air floating roller fan for sucking air flow in the corresponding branch reflux pipe into the air floating roller, a second heater and a second filter are arranged on the total reflux pipe, the second heater is positioned at the upstream of the second filter in the air flow flowing direction in the total reflux pipe, and a cooling water drain pipe is also arranged on the total reflux pipe and used for guiding cooling water in the total reflux pipe out of the total reflux pipe.

In one embodiment, the preliminary drying unit comprises four waste heat recovery ovens, the deep drying unit comprises four deep drying ovens, the waste heat recovery oven closest to the deep drying ovens has a membrane outlet for the membrane to be dried to extend out, the deep drying oven closest to the waste heat recovery ovens has a membrane inlet, the membrane inlet is in high agreement with the membrane outlet, a steering guide roller is arranged at the membrane inlet, and the height of the starting point of the serpentine path in the deep drying ovens is different from the height of the membrane inlet.

The above-mentioned scheme provides a battery pole piece drying system, wait to dry the diaphragm in the stoving in-process and pass through each waste heat recovery oven in proper order earlier, then pass through each degree of depth drying oven in proper order, wait to dry the diaphragm and accomplish preliminary stoving process in waste heat recovery oven, then carry out degree of depth drying in the degree of depth drying oven, thereby two types of ovens combine and can utilize less quantity of ovens to accomplish the stoving demand, reduction equipment manufacturing cost reduces area.

Drawings

Fig. 1 is a system diagram of a battery pole piece drying system according to this embodiment.

Fig. 2 is a partial enlarged view of N in fig. 1.

Fig. 3 is a schematic structural diagram of a waste heat recovery oven in the battery pole piece drying system shown in fig. 1.

Fig. 4 is a top view of the heat recovery oven of fig. 3.

Fig. 5 is a schematic structural diagram of a deep drying oven in the battery pole piece drying system shown in fig. 1.

Fig. 6 is a top view of the deep drying oven of fig. 5.

Reference numerals illustrate:

10. a battery pole piece drying system; 11. a preliminary drying unit; 12. a deep drying unit; 20. a waste heat recovery oven; 21. a first drying chamber; 22. a waste heat recovery module; 221. the first fresh air pipeline; 222. an exhaust pipeline; 223. a first heat exchanger; 23. a diaphragm outlet; 24. a first exhaust fan; 25. a first circulating fan; 26. a heating assembly; 27. an air knife; 28. a down wind knife; 30. deep drying oven; 31. a second drying chamber; 311. an air outlet chamber; 32. a drying guide unit; 321. an air-float roller; 322. an air knife mechanism; 3221. an upper hull B; 33. a diaphragm inlet; 34. a circulating air pipeline; 341. a second circulating fan; 342. a fresh air inlet; 343. a first heater; 344. a first filter; 35. a heat recovery line; 351. a second exhaust fan; 352. a second heater; 353. a second filter; 36. a second heat exchanger; 37. a total return pipe; 371. a branch return pipe; 38. a cooling water drain pipe; 40. and drying the membrane.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

As shown in fig. 1, in some embodiments, the present application provides a battery pole piece drying system 10, including a preliminary drying unit 11 and a deep drying unit 12.

The preliminary drying unit 11 includes a plurality of waste heat recovery ovens 20 arranged at intervals in sequence along a direction of travel of the film 40 to be dried, and the waste heat recovery ovens 20 have a first drying chamber 21 for passing the film 40 to be dried. As shown in fig. 3 and 4, the heat recovery oven 20 further has a heat recovery module 22, and the heat recovery module 22 is used for exchanging heat of hot air after baking the film 40 to be dried in the first drying chamber 21 to fresh air entering the first drying chamber 21. It can be understood that the waste heat recovery module 22 in the process of discharging the hot air used for drying the film 40 to be dried in the first drying chamber 21 can recover the heat in the hot air to the fresh air to be introduced into the first drying chamber 21, so as to save energy.

The deep drying unit 12 includes a plurality of deep drying ovens 30 sequentially arranged at intervals in a traveling direction of the film sheet 40 to be dried, the deep drying ovens 30 having a second drying chamber 31 for passing the film sheet 40 to be dried. As shown in fig. 2, 5 and 6, the deep drying oven 30 further has a drying guide unit 32 provided in the second drying chamber 31, the drying guide unit 32 being for guiding the film 40 to be dried in the second drying chamber 31 to follow a serpentine path. On the one hand, the drying effect can be improved, and on the other hand, the space occupied by the membranes arranged in the winding path is smaller under the condition that the drying length is the same in unit time, so that the size of the deep drying oven 30 can be designed smaller.

As shown in fig. 1, the preliminary drying unit 11 is located upstream of the deep drying unit 12 in the direction of the traveling of the film sheet 40 to be dried.

According to the battery pole piece drying system 10 provided by the scheme, the membrane 40 to be dried sequentially passes through the waste heat recovery ovens 20 in the drying process, then sequentially passes through the deep drying ovens 30, the membrane 40 to be dried completes the primary drying process in the waste heat recovery ovens 20, then deep drying is carried out in the deep drying ovens 30, and the two types of ovens are combined so that the drying requirement can be met by utilizing a small number of ovens, the equipment manufacturing cost is reduced, and the occupied area is reduced. In the technical field of battery pole piece coating and printing, a large number of ovens are usually required to be arranged in a drying system in order to achieve the pole piece drying effect, and the ovens are sequentially arranged along the pole piece tape-feeding direction, so that the floor area is large, and the equipment cost is extremely high. Through optimizing drying system in this application, adopt waste heat recovery oven 20 and the mode that degree of depth drying oven 30 combined together, and then adopt less quantity oven can reach the stoving purpose, solved the big pain point of area and difficult point. The film 40 to be dried is pre-dried in the heat recovery oven 20, and the drying effect can be ensured even by adopting a non-contact mode such as an air-floating roller when the film enters the deep drying oven 30 after the film is primarily dried, and the film 40 to be dried does not drop when the film 40 to be dried runs along a serpentine path because the film is primarily dried in the primary drying unit 11.

Specifically, in one embodiment, as shown in fig. 1, the preliminary drying unit 11 includes four waste heat recovery ovens 20, and the deep drying unit 12 includes four deep drying ovens 30.

Further, as shown in fig. 2, in some embodiments, the one of the heat recovery ovens 20 closest to the deep drying oven 30 has a membrane outlet 23 for the membrane 40 to be dried to protrude, and the one of the deep drying ovens 30 closest to the heat recovery oven 20 has a membrane inlet 33, the membrane inlet 33 being in high agreement with the membrane outlet 23. At the membrane inlet 33, a deflector roll (not shown) is provided, the starting point of the serpentine path in the deep-drying oven 30 being at a different height than the membrane inlet 33.

The film 40 to be dried, which is output from the first drying chamber 21, protrudes from the film outlet 23 and is then inserted into the film inlet 33, and then the film 40 to be dried is transited into the deep drying oven 30. However, since the starting point of the serpentine path in the deep drying oven 30 is different in height from the height of the film outlet 23 and the film inlet 33, the film 40 to be dried needs to be routed in the height direction of the oven after bypassing the turning guide roller so as to extend to the starting point of the serpentine path.

In some embodiments, the membrane inlet 33 and the membrane outlet 23 are narrow slits, the length direction of the membrane inlet 33 is consistent with the axial direction of the turning guide roller, the starting point of the winding path is higher than the height of the membrane inlet 33, and the membrane 40 to be dried changes direction after entering the deep drying oven 30 from the membrane inlet 33 to extend longitudinally to the starting point of the winding path.

In further detail, in some embodiments, as shown in fig. 3 and 4, the waste heat recovery module 22 includes a first fresh air line 221, an exhaust line 222, and a first heat exchanger 223, the fresh air inlet of the first fresh air line 221 is communicated with the external space of the waste heat recovery oven 20, the fresh air outlet of the first fresh air line 221 is communicated to the first drying chamber 21, the exhaust inlet of the exhaust line 222 is communicated to the first drying chamber 21, the exhaust outlet of the exhaust line 222 is communicated with the external space of the waste heat recovery oven 20, and both the first fresh air line 221 and the exhaust line 222 pass through the first heat exchanger 223, so that the heat of the hot air in the exhaust line 222 can be exchanged to the fresh air in the first fresh air line 221;

the waste heat recovery oven 20 further comprises a first exhaust fan 24, wherein the first exhaust fan 24 is used for driving air flow in an exhaust pipeline 222 to flow from an exhaust inlet to an exhaust outlet;

the waste heat recovery oven 20 further comprises a first circulating fan 25, and the first circulating fan 25 is used for driving air flow in the first fresh air pipeline 221 to flow from the fresh air inlet to the fresh air outlet.

The hot air used for baking the film 40 to be dried in the first drying chamber 21 is discharged to the external space from the air exhaust pipeline 222, and part of heat of the hot air in the process is transferred to the fresh air in the first fresh air pipeline 221 through the first heat exchanger 223, so that heat recycling is realized.

Further, in some embodiments, the heat recovery oven 20 has a mixing chamber therein. The heat recovery oven 20 further comprises a return air line (not shown) communicating between the first drying chamber 21 and the mixing chamber. The fresh air outlet of the first fresh air line 221 is connected to the mixing chamber, and the first circulating fan 25 is further configured to drive the air flow in the return air line from the first drying chamber 21 to the mixing chamber. The mixing chamber has a mixing air outlet which communicates with the first drying chamber 21. It can be understood that the first circulation fan 25 mainly functions to drive the hot air in the first drying chamber 21 to circulate to the mixing chamber through the return air pipeline and then further flow back to the first drying chamber 21, and the fresh air outlet of the first fresh air pipeline 221 is communicated with the mixing chamber, so that the fresh air having absorbed heat in the first fresh air pipeline 221 can be sucked into the mixing chamber under the action of negative pressure.

It can be understood that the hot air in the first drying chamber 21 is divided into two parts, wherein one part is discharged to the external space through the air discharge pipeline 222, and the heat of the part of hot air is transferred to the fresh air in the first fresh air pipeline 221 through the first heat exchanger 223; another part of the hot air flows to the mixing chamber through the return air pipeline, and the part of the hot air is mixed with the fresh air which absorbs a certain amount of heat through the first heat exchanger 223 to form mixed air, and the mixed air in the mixing chamber flows to the first drying chamber 21 again for drying the film 40 to be dried.

Further, the pipeline communicated between the air mixing outlet and the first drying chamber 21 is a heating pipeline, and a heating component 26 is arranged on the heating pipeline. The mixed wind is further heated to a target temperature at the heating assembly 26 to meet the drying requirement. The fresh air after absorbing heat and the return air from the return air pipeline are mixed firstly in the first heat exchanger 223, and the mixed air after being uniformly mixed is heated by the heating component 26, so that the temperature of the air flow finally entering the first drying chamber 21 meets the drying requirement, and the uniformity of the air flow temperature is higher.

In further detail, in some embodiments, as shown in fig. 1 and 2, a plurality of upwind knives 27 and a plurality of downwind knives 28 are disposed in the first drying chamber 21, an upper hull a communicating with an inner space of the upwind knives 27 is disposed on each upwind knife 27, a lower hull a communicating with an inner space of the downwind knives 28 is disposed on each downwind knife 28, the upper hull a and the lower hull a are communicated with a mixing air outlet, the plurality of upwind knives 27 are sequentially and alternately disposed along a feeding direction of the film 40 to be dried, the plurality of downwind knives 28 are sequentially and alternately disposed along a feeding direction of the film 40 to be dried, all the upwind knives 27 are used for guiding hot wind to blow to one side of the film 40 to be dried, and all the downwind knives 28 are used for guiding hot wind to blow to the other side of the film 40 to be dried.

After the mixed air in the mixing chamber enters the upper hull a and the lower hull a respectively in two paths, the mixed air is blown to the membrane 40 to be dried from the upper air knife 27 and the lower air knife 28 respectively. The membrane in the first drying chamber 21 moves along a straight path, and the height of the membrane outlet 23 is identical to the height of the membrane in the first drying chamber 21.

Further, in some embodiments, as shown in fig. 2, 5 and 6, the drying guiding unit 32 includes a plurality of air-floating rollers 321 and a plurality of main driving rollers (not labeled in the drawings) all located in the second drying chamber 31, the plurality of main driving rollers are parallel to each other and are arranged at intervals, the spaced arrangement path of the plurality of main driving rollers is a first path, two main driving rollers correspond to the air-floating rollers 321, the air-floating rollers 321 are parallel to the corresponding main driving rollers, all the air-floating rollers 321 are located on the same side of the first path, and all the air-floating rollers 321 are provided with air vents.

The film 40 to be dried sequentially passes around the main driving roller and the air bearing roller 321, and proceeds in a serpentine path. The air outlet direction of all the exhaust holes is towards the membrane to be dried bypassing the air-float roller 321, and the air blown by the air-float roller 321 can enable the membrane to be dried 40 to float at the periphery of the air-float roller 321 and not contact with the air-float roller 321, so that the contact between the air-float roller 321 and the membrane to be dried 40 is reduced as much as possible while the drying effect is achieved. Located at the start of the serpentine path is a main drive roller having a height greater than the height of the film inlet 33, around which the film entering the second drying chamber 31 changes direction after bypassing the deflector roll.

In particular, in one embodiment, as shown in fig. 2 and fig. 5, the first path is a straight path, the distances between each air-floating roller 321 and the first path are equal, and each air-floating roller 321 is arranged between two corresponding main driving rollers in a staggered manner.

As shown in fig. 2 and 5, all the main driving rollers are at the same height, all the air floating rollers 321 are at another height, and the main driving rollers are at a height higher than the height of the film inlet 33.

In some embodiments, as shown in fig. 1, 2 and 3, all the windup knives 27 are at the same height, all the down knives 28 are at another height, and the upper side of the film sheet 40 to be dried in the first drying chamber 21 faces the windup knives 27 and the lower side faces the down knives 28. The film 40 to be dried in the second drying chamber 31 sequentially bypasses the main driving roller and the air floating roller 321, the starting position of the winding path is the main driving roller, and the height of the main driving roller is higher than the height of the film 40 to be dried in the waste heat recovery oven 20.

Further, in some embodiments, as shown in fig. 2 and 5, each two adjacent main driving rollers, the air-floating roller 321 corresponding to the two main driving rollers and the membrane 40 to be dried between the two main driving rollers together define a drying area, each drying area is provided with an air knife mechanism 322, the deep drying oven 30 further has an upper hull B3221, and all the air knife mechanisms 322 are communicated with the space in the upper hull B3221. The air flow in the upper hull B3221 can enter into the respective air knife mechanism 322 and then blow from said air knife mechanism 322 onto the membrane 40 to be dried, which defines the drying zone.

As shown in fig. 2 and 5, the air knife mechanism 322 is inserted in the drying area, the upper side surface of the film 40 to be dried can face the air-floating roller 321 and the air knife mechanism 322 in the forward process, the hot air blown by the air-floating roller 321 and the hot air blown by the air knife mechanism 322 can both be blown to the upper side surface of the film 40 to be dried, the area on the film 40 to be dried, which is used for limiting the drying area, can be blown to by the hot air is larger, and the drying efficiency of the drying system is higher. And the air knife mechanism 322 is arranged by the naturally formed drying area of the film 40 to be dried in the advancing way along the winding path, thereby improving the drying effect and reducing the increase of the equipment size as much as possible.

Further, as shown in fig. 5 and 6, in some embodiments, the deep drying oven 30 further includes a circulating air pipeline 34, an air outlet chamber 311 communicating with the second drying chamber 31 is further provided in the deep drying oven 30, the circulating air pipeline 34 is connected between the air outlet chamber 311 and the upper hull B3221, a second circulating fan 341 is provided on the circulating air pipeline 34, and the second circulating fan 341 is used for driving the air flow in the circulating air pipeline 34 to flow from a position close to the air outlet chamber 311 to a position close to the upper hull B3221. A fresh air inlet 342 is also provided in the circulation air line 34. The deep drying oven 30 further comprises a second fresh air pipeline (not labeled in the figure), a fresh air inlet of the second fresh air pipeline is communicated with an external space of the deep drying oven 30, and a fresh air outlet of the second fresh air pipeline is communicated with a fresh air inlet 342 on the circulating air pipeline. The hot air in the second drying chamber 31 used for baking the film 40 to be dried can enter the air outlet chamber 311, the hot air in the air outlet chamber 311 can circulate into the upper ship body B3221 from the circulating air pipeline 34, and the air flow circulated into the upper ship body B3221 can blow the film 40 to be dried from the air knife mechanism 322 again, so that the air flow is reused. The hot air repeatedly flowing from the circulation air pipeline 34 to the upper hull B3221 is mixed with the fresh air entering through the fresh air inlet 342 in the circulation air pipeline 34, and the mixed air enters into the upper hull B3221 again.

Moreover, in some embodiments, as shown in fig. 5, a first heater 343 and a first filter 344 are further disposed on the circulating air pipeline 34, the first filter 344 is located downstream of the first heater 343 in the airflow direction in the circulating air pipeline 34, the fresh air inlet 342 is located upstream of the first heater 343, and the mixed air in the circulating air pipeline 34 can be heated to the target temperature through the first heater 343.

Further, as shown in fig. 5 and 6, the deep drying oven 30 further includes a heat recovery pipeline 35 and a second heat exchanger 36, one end of the heat recovery pipeline 35 is communicated with the air outlet chamber 311, the other end of the heat recovery pipeline 35 is communicated with the external space of the deep drying oven 30, a second air exhaust fan 351 is arranged on the heat recovery pipeline 35, and the second air exhaust fan 351 is used for driving the air flow in the heat recovery pipeline 35 to flow from a position close to the air outlet chamber 311 to the external space of the deep drying oven 30. The heat recovery line 35 and the second fresh air line both pass through a second heat exchanger 36.

The fresh air in the second fresh air pipeline can absorb the heat of the hot air in the heat recovery pipeline 35 when passing through the second heat exchanger 36, so that heat recovery is realized. The fresh air after absorbing heat in the second fresh air pipeline enters the circulating air pipeline 34 from a fresh air inlet on the circulating air pipeline 34.

As shown in fig. 5 and 6, in some embodiments, the circulating air line 34 is further provided with a first heater 343 and a first filter 344, the first heater 343 is located downstream of the fresh air inlet 342 on the circulating air line 34 in the air flow direction in the circulating air line 34, and the first filter 344 is located downstream of the first heater 343. The fresh air introduced into the circulating air duct 34 from the fresh air inlet 342 is first mixed with the hot air to form a mixed air, and then the mixed air is heated to a target temperature by the first heater 343.

Further, as shown in fig. 5 and 6, in still other embodiments, the deep drying oven 30 further includes a main return pipe 37 and a plurality of branch return pipes 371, the main return pipe 37 being in communication with the heat recovery line 35, each branch return pipe 371 being in communication with the main return pipe 37, and a branch return pipe 371 being in communication with an air bearing roller 321. Each air-float roller 321 corresponds to an air-float roller blower (not labeled in the figure) for sucking the air flow in the corresponding branch return tube 371 into the air-float roller 321. For example, an air-floating roller fan may be disposed on each branch return tube 371 for driving the air flow in the branch return tube 371 to flow into the air-floating roller 321. The total return pipe 37 is provided with a second heater 352 and a second filter 353, and the second heater 352 is located upstream of the second filter 353 in the direction of flow of the air in the total return pipe 37.

After the hot air in the air outlet chamber 311 enters the heat recovery pipeline 35, a part of the hot air in the heat recovery pipeline 35 passes through the second heat exchanger 36 under the action of the second exhaust fan 351, transfers heat to the fresh air in the second fresh air pipeline, and then is discharged to the external space of the deep drying oven 30. The other part of hot air in the heat recovery pipeline 35 flows into each air-float roller 321 through the total return pipe 37 and the branch return pipe 371 under the action of each air-float roller fan, and the air flow in the air-float roller 321 blows into the second drying chamber 31 again for recycling.

As shown in fig. 6, in some embodiments, the total return pipe 37 is further provided with a cooling water drain 38 for draining the cooling water in the total return pipe 37 out of the total return pipe 37.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A battery pole piece drying system, comprising:

the primary drying unit comprises a plurality of waste heat recovery ovens which are sequentially arranged at intervals along the tape moving direction of the film to be dried, wherein the waste heat recovery ovens are provided with first drying chambers for the film to be dried to pass through, and waste heat recovery modules which are used for exchanging heat of hot air for baking the film to be dried in the first drying chambers to fresh air entering the first drying chambers;

2. The battery pole piece drying system of claim 1, wherein the waste heat recovery module comprises a first fresh air pipeline, an exhaust air pipeline and a first heat exchanger, wherein a fresh air inlet of the first fresh air pipeline is communicated with an external space of the waste heat recovery oven, a fresh air outlet of the first fresh air pipeline is communicated with the first drying chamber, an exhaust air inlet of the exhaust air pipeline is communicated with the first drying chamber, an exhaust air outlet of the exhaust air pipeline is communicated with the external space of the waste heat recovery oven, and the first fresh air pipeline and the exhaust air pipeline both pass through the first heat exchanger, so that heat of hot air in the exhaust air pipeline can be exchanged for fresh air in the first fresh air pipeline;

3. The battery pole piece drying system of claim 2, wherein the waste heat recovery oven further comprises a return air line, the waste heat recovery oven having a mixing chamber therein, the return air line being in communication between the first drying chamber and the mixing chamber, a fresh air outlet of the first fresh air line being in communication with the mixing chamber, the first circulating fan further being configured to drive air flow in the return air line from the first drying chamber to the mixing chamber, the mixing chamber having a mixing air outlet in communication with the first drying chamber;

4. The battery pole piece drying system according to claim 3, wherein a plurality of windup knives and a plurality of leedown knives are arranged in the first drying chamber, each windup knife is provided with an upper hull A communicated with the inner space of the windup knife, each leedown knife is provided with a lower hull A communicated with the inner space of the windup knife, the upper hulls A and the lower hulls A are communicated with the air mixing outlet, the plurality of windup knives are sequentially and alternately arranged along the feeding direction of the film to be dried, the plurality of leedown knives are sequentially and alternately arranged along the feeding direction of the film to be dried, all the windup knives are used for guiding hot air to blow to one side surface of the film to be dried, and all the leedown knives are used for guiding hot air to blow to the other side surface of the film to be dried.

5. The battery pole piece drying system according to claim 1, wherein the drying guide unit comprises a plurality of air-float rollers and a plurality of main driving rollers which are all positioned in the second drying chamber, the main driving rollers are parallel to each other and are arranged at intervals, the interval arrangement path of the main driving rollers is a first path, two main driving rollers correspond to one air-float roller, the air-float rollers are parallel to the corresponding main driving rollers, all the air-float rollers are positioned on the same side of the first path, a film to be dried can sequentially bypass the main driving rollers and the air-float rollers and move forward according to a serpentine path, exhaust holes are formed in all the air-float rollers, and the air outlet direction of all the exhaust holes faces to the film to be dried which bypasses the air-float rollers.

6. The battery pole piece drying system of claim 5, wherein the first path is a straight path, the distance between each air-bearing roller and the first path is equal, and each air-bearing roller is arranged between two corresponding main driving rollers in a staggered manner.

7. The battery pole piece drying system of claim 5, wherein each two adjacent main driving rollers, the air-floating rollers corresponding to the two main driving rollers and the membrane to be dried between the two main driving rollers together define a drying area, each drying area is provided with an air knife mechanism, the deep drying oven is further provided with an upper ship body B, and all the air knife mechanisms are communicated with the space in the upper ship body B.

8. The battery pole piece drying system according to claim 7, wherein the deep drying oven further comprises a circulating air pipeline, an air outlet chamber communicated with the second drying chamber is further arranged in the deep drying oven, the circulating air pipeline is communicated between the air outlet chamber and the upper ship body B, a second circulating fan is arranged on the circulating air pipeline and used for driving air flow in the circulating air pipeline to flow from a position close to the air outlet chamber to a position close to the upper ship body B, a fresh air inlet is further arranged on the circulating air pipeline, the deep drying oven further comprises a second fresh air pipeline, a fresh air inlet of the second fresh air pipeline is communicated with an external space of the deep drying oven, and a fresh air outlet of the second fresh air pipeline is communicated with a fresh air inlet of the circulating air pipeline;

9. The battery pole piece drying system of claim 8, wherein a first heater and a first filter are further provided on the circulation air duct, the first heater being located downstream of the fresh air inlet on the circulation air duct in the direction of airflow through the circulation air duct, the first filter being located downstream of the first heater;

10. Battery pole piece drying system according to any of claims 1-9, characterized in that the primary drying unit comprises four of the waste heat recovery ovens, the deep drying unit comprises four of the deep drying ovens, that the waste heat recovery oven closest to the deep drying oven has a membrane outlet for the extension of the membrane to be dried, that the deep drying oven closest to the waste heat recovery oven has a membrane inlet, which membrane inlet is at the same height as the membrane outlet, at which membrane inlet turning guide rollers are provided, and that the starting point height of the meandering path in the deep drying oven is different from the height of the membrane inlet.