Anode coating and recycling all-in-one machine

Abstract

The utility model relates to the technical field of positive electrode coating equipment, in particular to a positive electrode coating and recycling all-in-one machine which comprises a machine base and is characterized by further comprising a coating assembly and an NMP recycling assembly which are arranged on the machine base; the coating assembly comprises a coating box body arranged in the machine base; the NMP recovery assembly comprises an exhaust air pipe, an exhaust fan, a gas-gas heat exchanger and a wire mesh demister which are arranged above the machine base. The exhaust air pipe is connected with the coating box body; the wire mesh demister is connected with a cold side air return pipe and a tail exhaust treatment air pipe, and the cold side air return pipe is connected to the gas-gas heat exchanger; and the gas-gas heat exchanger is connected with a hot side air return pipe, and the hot side air return pipe is connected with the coating box body. The high-temperature NMP waste gas is recycled and heated after being subjected to heat exchange and condensation, the heated NMP waste gas enters the coating box body again for use through the hot side air return pipe, the equipment space and the occupied area can be reduced through the integrated arrangement, and therefore the NMP waste gas treatment and recycling efficiency is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of positive electrode coating equipment, and particularly to an integrated positive electrode coating and recycling machine. Background Art

[0002] The production of lithium batteries requires the use of coating machines. Coating machines are divided into positive electrode coating machines and negative electrode coating machines. When the positive electrode coating machine operates, a large amount of high-temperature NMP waste gas is generated. These NMP waste gases are at a relatively high temperature and harmful to the environment, so they need to be treated and recycled. In traditional processes, an independent NMP recovery system is set outside the coating machine to treat and recycle the NMP waste gas. The NMP waste gas generated by the positive electrode coating machine enters the NMP recovery system for condensation treatment. The temperature drops to about 15°C and then enters the next process. Some of the NMP waste gas is heated to about 110°C and then returned to the coating machine. However, since the coating machine and the NMP recovery system are set independently of each other, they require a large amount of space and floor area. Especially in large-scale production, a large amount of site area is consumed, resulting in low processing efficiency and high costs. Content of the Utility Model

[0003] In order to improve the problem in the related art that the positive electrode coating machine requires a large amount of site area, the present utility model provides an integrated positive electrode coating and recycling machine.

[0004] An integrated positive electrode coating and recycling machine includes a machine base, and further includes a coating assembly and an NMP recovery assembly provided on the machine base; the coating assembly includes a coating box body provided in the machine base; the NMP recovery assembly includes an exhaust air duct, an exhaust air fan, a gas-gas heat exchanger, and a wire mesh demister provided above the machine base; the exhaust air duct is connected to the coating box body; the wire mesh demister is connected with a cold side return air duct and a tail gas treatment air duct, and the cold side return air duct is connected to the gas-gas heat exchanger; the gas-gas heat exchanger is connected with a hot side return air duct, and the hot side return air duct is connected to the coating box body.

[0005] Further, the coating assembly further includes a guide volute provided on the machine base and a circulation fan connected to the guide volute. The guide volute is conically arranged and connected to the hot side return air duct; the circulation fan is connected to the coating box body, and a high-efficiency filter is provided between the circulation fan and the coating box body.

[0006] Further, it further includes a heat exchange assembly. The heat exchange assembly includes a low-temperature heat exchanger and a high-temperature heat exchanger. The low-temperature heat exchanger is provided between the gas-gas heat exchanger and the wire mesh demister, and the low-temperature heat exchanger is connected with a low-temperature liquid inlet pipe and a low-temperature liquid outlet pipe; the high-temperature heat exchanger is provided between the circulation fan and the high-efficiency filter, and the high-temperature heat exchanger is connected with a high-temperature liquid inlet pipe and a high-temperature liquid outlet pipe.

[0007] Further, the heat exchange component further includes a rock wool insulation layer, and the rock wool insulation layer is wrapped around the high-temperature liquid inlet pipe and the high-temperature liquid outlet pipe.

[0008] Further, the NMP recovery component further includes a waste liquid drain member, and the waste liquid drain member includes a plurality of waste liquid drain pipes, and the plurality of waste liquid drain pipes are respectively connected to the low-temperature heat exchanger, between the low-temperature heat exchanger and the wire mesh demister, and between the wire mesh demister and the cold side return air duct.

[0009] Further, the NMP recovery component further includes a rock wool layer and a rubber and plastic cotton layer. The rock wool layer is wrapped around the exhaust air duct, the air-air heat exchanger, and the hot side return air duct; the rubber and plastic cotton layer is wrapped around the low-temperature heat exchanger, the cold side return air duct, the tail exhaust treatment air duct, the low-temperature liquid inlet pipe, and the low-temperature liquid outlet pipe.

[0010] Further, a monitoring component is further included, and the monitoring component includes a temperature sensing component, a pressure sensing component, and a wind speed sensing component provided on the NMP recovery component.

[0011] Further, the temperature sensing component includes a first temperature sensor provided on the exhaust air duct, a second temperature sensor provided between the low-temperature heat exchanger and the wire mesh demister, a third temperature sensor provided on the hot side return air duct, a fourth temperature sensor provided on the low-temperature liquid inlet pipe, a fifth temperature sensor provided on the low-temperature liquid outlet pipe, a sixth temperature sensor provided on the high-temperature liquid inlet pipe, and a seventh temperature sensor provided on the high-temperature liquid outlet pipe.

[0012] Further, the pressure sensing component includes a first pressure sensor provided on the exhaust air duct, a second pressure sensor provided on the hot side return air duct, a third pressure sensor provided on the low-temperature liquid inlet pipe, a fourth pressure sensor provided on the low-temperature liquid outlet pipe, a fifth pressure sensor provided on the high-temperature liquid inlet pipe, and a sixth pressure sensor provided on the high-temperature liquid outlet pipe.

[0013] Further, the wind speed sensing component includes a first wind speed sensor provided on the cold side return air duct.

[0014] The utility model has the following advantages:

[0015] 1. A positive electrode coating and recovery integrated machine of the present utility model sets the NMP recovery component above the machine base. When high-temperature NMP waste gas is generated in the coating box body, the high-temperature NMP waste gas will enter the gas-gas heat exchanger through the exhaust air duct for heat exchange. The NMP waste gas after heat exchange enters the wire mesh demister for condensation and recovery. Part of the NMP waste gas after condensation and recovery re-enters the gas-gas heat exchanger through the cold-side return air duct to be heated up, and the heated NMP waste gas re-enters the coating box body through the hot-side return air duct for use. The positive electrode coating and recovery integrated machine modularizes and arranges the coating system and the NMP recovery system structurally, and integrates them into an integrated machine device, which can reduce the equipment space and floor area, thereby effectively improving the treatment and recovery efficiency of NMP waste gas.

[0016] 2. A positive electrode coating and recovery integrated machine of the present utility model is also provided with a heat exchange component. The high-temperature NMP waste gas will continue to enter the low-temperature heat exchanger for heat exchange after passing through the gas-gas heat exchanger, so that the heat in the high-temperature waste gas can be further recovered and utilized; at the same time, the set high-temperature heat exchanger can transfer the heat recovered by the low-temperature heat exchanger to the high-temperature heat exchanger for recovery and utilization to achieve secondary recovery, achieving the effect of further saving energy. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a top view of a positive electrode coating and recovery integrated machine according to an embodiment of the present application;

[0019] Figure 2 It is a side view of a positive electrode coating and recovery integrated machine according to an embodiment of the present application;

[0020] Figure 3 It is a return air flow direction diagram of the coating component in an embodiment of the present application.

[0021] Description of the reference numerals:

[0022] 1. Machine base; 11. Maintenance door; 2. Coating assembly; 21. Flow guide volute; 22. Circulation fan; 23. High-efficiency filter; 3. NMP recovery assembly; 31. Exhaust air duct; 310. Coating exhaust air outlet; 311. Exhaust air valve; 32. Exhaust air fan; 321. Flexible connection piece; 33. Air-to-air heat exchanger; 34. Wire mesh demister; 35. Cold side return air duct; 36. Tail exhaust treatment air duct; 37. Hot side return air duct; 371. Coating return air outlet; 372. Return air valve; 38. Waste liquid drain piece; 4. Heat exchange assembly; 41. Low-temperature heat exchanger; 411. Low-temperature liquid inlet pipe; 412. Low-temperature liquid outlet pipe; 42. High-temperature heat exchanger; 421. High-temperature liquid inlet pipe; 422. High-temperature liquid outlet pipe; 5. Monitoring assembly; 51. First temperature sensor; 52. Second temperature sensor; 53. Third temperature sensor; 54. First pressure sensor; 55. Second pressure sensor; 56. First air velocity sensor; 6. Partition assembly; 61. Partition board; 62. Partition air valve. Detailed implementation manners

[0023] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0027] Referring to Figure 1 and Figure 2 , a positive electrode coating and recovery integrated machine, including a machine base 1, and further including a coating assembly 2, an NMP recovery assembly 3, a heat exchange assembly 4 and a monitoring assembly 5 disposed on the machine base 1. When the coating assembly 2 generates high-temperature NMP waste gas, the high-temperature NMP waste gas will enter the NMP recovery assembly 3 for heat exchange, condensation and recovery. Part of the NMP waste gas after condensation and recovery will re-enter the NMP recovery assembly 3 to be heated, and the heated NMP waste gas will re-enter the coating box for use.

[0028] Specifically, the machine base 1 is used to accommodate and install and support each component. In order to facilitate the adjustment of each component, the machine base 1 is provided with a number of maintenance doors 11, and maintenance personnel can enter the interior of the machine base 1 through the maintenance doors 11. The coating assembly 2 includes a coating box disposed in the frame. The NMP recovery assembly 3 includes an exhaust air duct 31, an exhaust air fan 32, a gas-gas heat exchanger 33 and a wire mesh demister 34 disposed above the machine base 1. One end of the exhaust air duct 31 has a coating exhaust air outlet 310, and the exhaust air duct 31 is connected to the coating box through the coating exhaust air outlet 310. An exhaust air valve 311 for controlling the gas flow is provided in the coating exhaust air outlet 310. The exhaust air fan 32 is disposed at the other end of the exhaust air duct 31, and a flexible connector 321 is provided between the exhaust air fan 32 and the gas-gas heat exchanger 33. Driven by the exhaust air fan 32, the high-temperature NMP waste gas enters the exhaust air duct 31 from the coating box and then enters the gas-gas heat exchanger 33.

[0029] Referring to Figure 1 , Figure 2 and Figure 3, one end of the gas-gas heat exchanger 33 away from the exhaust fan 32 is connected to the wire mesh demister 34. One end of the wire mesh demister 34 is connected to the gas-gas heat exchanger 33, and the other end of the wire mesh demister 34 is connected to a cold-side return air duct 35 and a tail gas treatment air duct 36. The cold-side return air duct 35 is connected to the gas-gas heat exchanger 33. The gas-gas heat exchanger 33 is connected to a hot-side return air duct 37. The hot-side return air duct 37 is connected to the coating box body. The hot-side return air duct 37 has a coating return air opening 371. The hot-side return air duct 37 is connected to the guide volute 21 through the coating return air opening 371. A return air valve 372 is provided at the coating return air opening 371. With such an arrangement, the high-temperature NMP waste gas will enter the gas-gas heat exchanger 33 through the exhaust air duct 31 for heat exchange. The NMP waste gas after heat exchange enters the wire mesh demister 34 for condensation and recovery. Part of the NMP waste gas after condensation and recovery re-enters the gas-gas heat exchanger 33 through the cold-side return air duct 35 to be heated up. The heated NMP waste gas re-enters the coating box body through the hot-side return air duct 37 for use.

[0030] In addition, the coating assembly 2 further includes a guide volute 21 provided on the machine base 1 and a circulation fan 22 connected to the guide volute 21. The guide volute 21 is arranged in a conical shape and is connected to the hot-side return air duct 37; the circulation fan 22 is connected to the coating box body, and a high-efficiency filter 23 is provided between the circulation fan 22 and the coating box body. By providing the guide volute 21, the gas flow can be accelerated to improve the processing efficiency.

[0031] In order to further utilize the NMP waste gas, the positive electrode coating recycling integrated machine further includes a heat exchange assembly 4. The heat exchange assembly 4 includes a low-temperature heat exchanger 41 and a high-temperature heat exchanger 42. The low-temperature heat exchanger 41 is arranged between the gas-gas heat exchanger 33 and the wire mesh demister 34. The low-temperature heat exchanger 41 is connected to a low-temperature liquid inlet pipe 411 and a low-temperature liquid outlet pipe 412; the high-temperature heat exchanger 42 is arranged between the circulation fan 22 and the high-efficiency filter 23. The high-temperature heat exchanger 42 is connected to a high-temperature liquid inlet pipe 421 and a high-temperature liquid outlet pipe 422. The high-temperature heat exchanger 42 is connected to the coating box body. At the same time, the heat exchange assembly 4 further includes a rock wool insulation layer, and the rock wool insulation layer is coated on the high-temperature liquid inlet pipe 421 and the high-temperature liquid outlet pipe 422.

[0032] By setting up the heat exchange component 4, the high-temperature NMP waste gas enters the low-temperature heat exchanger 41 for secondary recovery after passing through the gas-gas heat exchanger 33. The low-temperature heat exchanger 41 recovers the heat and transfers it to the high-temperature heat exchanger 42 for utilization. The NMP waste gas of the return air returns to the coating box after passing through the high-temperature heat exchanger 42. It can be understood that the low-temperature heat exchanger 41 and the high-temperature heat exchanger 42 can be used independently or in combination. In addition, the NMP recovery component 3 further includes a rock wool layer and a rubber and plastic cotton layer. The rock wool layer is coated on the exhaust air duct 31, the gas-gas heat exchanger 33, and the hot-side return air duct 37; the rubber and plastic cotton layer is coated on the low-temperature heat exchanger 41, the cold-side return air duct 35, the tail gas treatment duct 36, the low-temperature liquid inlet pipe 411, and the low-temperature liquid outlet pipe 412 for heat preservation.

[0033] In order to discharge the waste liquid in time, the NMP recovery component 3 further includes a waste liquid drainage member 38. The waste liquid drainage member 38 includes a plurality of waste liquid drainage pipes, and the plurality of waste liquid drainage pipes are respectively connected between the low-temperature heat exchanger 41, between the low-temperature heat exchanger 41 and the wire mesh demister 34, and between the wire mesh demister 34 and the cold-side return air duct 35. By setting up the waste liquid drainage member 38, the waste liquid generated during the heat exchange and condensation processes can be discharged in time through the waste liquid drainage pipes to ensure the normal operation of the NMP recovery component 3.

[0034] In this embodiment, in order to ensure the compact structure of the positive electrode coating recovery integrated machine, the exhaust air fan 32, the gas-gas heat exchanger 33, the low-temperature heat exchanger 41, and the wire mesh demister 34 are arranged in sequence and on the same straight line, and the cold-side return air duct 35 winds back to the gas-gas heat exchanger 33 along the direction of this straight line. The hot-side return air duct 37 extends and is connected above the guide volute 21 from one end of the gas-gas heat exchanger 33 away from the cold-side return air duct 35. By setting it like this, the positive electrode coating recovery integrated machine can achieve a small modular layout while ensuring the gas flow rate, reducing the equipment space and floor area, and effectively improving the treatment and recovery efficiency of the NMP waste gas.

[0035] Since the coating boxes do not operate independently but are arranged in parallel in multiple sections, the operating temperatures required for each section of the coating boxes are inconsistent. In order to monitor the coating boxes for easy control, the monitoring component 5 includes a temperature sensing component, a pressure sensing component, and a wind speed sensing component arranged on the NMP recovery component 3. In this embodiment, the temperature sensing component includes a first temperature sensor 51 arranged on the exhaust air duct 31, a second temperature sensor 52 arranged between the low-temperature heat exchanger 41 and the wire mesh demister 34, a third temperature sensor 53 arranged on the hot-side return air duct 37, a fourth temperature sensor arranged on the low-temperature liquid inlet pipe 411, a fifth temperature sensor arranged on the low-temperature liquid outlet pipe 412, a sixth temperature sensor arranged on the high-temperature liquid inlet pipe 421, and a seventh temperature sensor arranged on the high-temperature liquid outlet pipe 422.

[0036] Similarly, the pressure sensing assembly includes a first pressure sensor 54 disposed in the exhaust air duct 31, a second pressure sensor 55 disposed in the hot side return air duct 37, a third pressure sensor disposed in the low temperature liquid inlet pipe 411, a fourth pressure sensor disposed in the low temperature liquid outlet pipe 412, a fifth pressure sensor disposed in the high temperature liquid inlet pipe 421, and a sixth pressure sensor disposed in the high temperature liquid outlet pipe 422. The wind speed sensing assembly includes a first wind speed sensor 56 disposed in the cold side return air duct 35. It can be understood that the number and specific positions of the temperature sensing assembly, the pressure sensing assembly, and the wind speed sensing assembly can be adjusted according to actual needs.

[0037] Meanwhile, the positive electrode coating integrated machine further includes a partition assembly 6. The partition assembly includes a plurality of partition plates 61 disposed on the machine base 1, and the partition plates 61 are provided with partition air valves 62. Through the partition plates 61 and the partition air valves 62, different components can be partitioned and the gas flow rate between each component can be controlled, which can cooperate with the monitoring assembly 5 to achieve further control.

[0038] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0039] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A positive electrode coating and recycling integrated machine, comprising a machine base (1), characterized in that, It further includes a coating assembly (2) and an NMP recovery assembly (3) provided on the base (1); the coating assembly (2) includes a coating box body provided in the base (1); the NMP recovery assembly (3) includes an exhaust air duct (31), an exhaust air fan (32), an air-air heat exchanger (33) and a wire mesh demister (34) provided above the base (1); the exhaust air duct (31) is connected to the coating box body; the wire mesh demister (34) is connected with a cold side return air duct (35) and a tail exhaust treatment air duct (36), and the cold side return air duct (35) is connected to the air-air heat exchanger (33); the air-air heat exchanger (33) is connected with a hot side return air duct (37), and the hot side return air duct (37) is connected to the coating box body; The coating assembly (2) further includes a guide volute (21) provided on the base (1) and a circulation fan (22) connected to the guide volute (21), the guide volute (21) is arranged in a conical shape and connected to the hot side return air duct (37); the circulation fan (22) is connected to the coating box body, and a high-efficiency filter (23) is arranged between the circulation fan (22) and the coating box body; It further includes a heat exchange assembly (4), the heat exchange assembly (4) includes a low-temperature heat exchanger (41) and a high-temperature heat exchanger (42), the low-temperature heat exchanger (41) is arranged between the air-air heat exchanger (33) and the wire mesh demister (34), and the low-temperature heat exchanger (41) is connected with a low-temperature liquid inlet pipe (411) and a low-temperature liquid outlet pipe (412); the high-temperature heat exchanger (42) is arranged between the circulation fan (22) and the high-efficiency filter (23), and the high-temperature heat exchanger (42) is connected with a high-temperature liquid inlet pipe (421) and a high-temperature liquid outlet pipe (422).

2. The integrated machine for recycling cathode coating according to claim 1, characterized in that, The heat exchange assembly (4) further includes a rock wool heat insulation layer, and the rock wool heat insulation layer is coated on the high-temperature liquid inlet pipe (421) and the high-temperature liquid outlet pipe (422).

3. The integrated machine for recycling positive electrode coating according to claim 1, characterized in that, The NMP recovery assembly (3) further includes a waste liquid drainage member (38), the waste liquid drainage member (38) includes a plurality of waste liquid drainage pipes, and the plurality of waste liquid drainage pipes are respectively connected to the low-temperature heat exchanger (41), between the low-temperature heat exchanger (41) and the wire mesh demister (34), and between the wire mesh demister (34) and the cold side return air duct (35).

4. The integrated positive electrode coating recycling machine according to claim 3, characterized in that, The NMP recovery assembly (3) further includes a rock wool layer and a rubber and plastic cotton layer, the rock wool layer is coated on the exhaust air duct (31), the air-air heat exchanger (33) and the hot side return air duct (37); the rubber and plastic cotton layer is coated on the low-temperature heat exchanger (41), the cold side return air duct (35), the tail exhaust treatment air duct (36), the low-temperature liquid inlet pipe (411) and the low-temperature liquid outlet pipe (412).

5. A cathode coating recycling integrated machine according to any one of claims 1-4, characterized in that, It further includes a monitoring assembly (5), the monitoring assembly (5) includes a temperature sensing assembly, a pressure sensing assembly and a wind speed sensing assembly provided on the NMP recovery assembly (3).

6. The integrated cathode coating recycling machine according to claim 5, characterized in that, The temperature sensing component includes a first temperature sensor (51) disposed in the exhaust air duct (31), a second temperature sensor (52) disposed between the low-temperature heat exchanger (41) and the wire mesh demister (34), a third temperature sensor (53) disposed in the hot side return air duct (37), a fourth temperature sensor disposed in the low-temperature liquid inlet pipe (411), a fifth temperature sensor disposed in the low-temperature liquid outlet pipe (412), a sixth temperature sensor disposed in the high-temperature liquid inlet pipe (421), and a seventh temperature sensor disposed in the high-temperature liquid outlet pipe (422).

7. The integrated machine for recycling cathode coating according to claim 5, characterized in that, The pressure sensing component includes a first pressure sensor (54) disposed in the exhaust air duct (31), a second pressure sensor (55) disposed in the hot side return air duct (37), a third pressure sensor disposed in the low-temperature liquid inlet pipe (411), a fourth pressure sensor disposed in the low-temperature liquid outlet pipe (412), a fifth pressure sensor disposed in the high-temperature liquid inlet pipe (421), and a sixth pressure sensor disposed in the high-temperature liquid outlet pipe (422).

8. The integrated machine for recycling cathode coating according to claim 5, characterized in that, The wind speed sensing component includes a first wind speed sensor (56) disposed in the cold side return air duct (35).

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