Pole piece evaporation baking mechanism and equipment

Abstract

The utility model belongs to the technical field of pole piece drying equipment structures, and particularly relates to a pole piece evaporating and baking mechanism which comprises an oven, an air supply structure, an air exhaust structure and a controller, and the air supply structure and the air exhaust structure are communicated with the air inlet end and the air outlet end of the oven through conveying pipelines respectively. The controller is electrically connected with the oven, the air supply structure and the air exhaust structure; wherein the air supply structure comprises an air blower and a solution recovery tank communicated with the output end of the air blower, the solution recovery tank is communicated with the input end of the conveying pipeline, the solution recovery tank is provided with a humidifying assembly, and a baffle is arranged at the end, close to the conveying pipeline, of the solution recovery tank. By arranging the air supply structure, the air exhaust structure and the controller, the coating evaporation capacity of the pole piece can be controlled, and the real-time evaporation capacity of slurry is kept constant. In addition, the utility model further discloses equipment comprising the pole piece evaporation baking mechanism.

Description

Technical Field

[0001] The utility model belongs to the technical field of pole piece drying equipment structure, and specifically relates to a pole piece evaporation baking mechanism and equipment. Background Art

[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium-ion batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides a broad space for the application and development of lithium-ion batteries.

[0003] Among them, the battery pole piece needs to be dried during the manufacturing process. However, when the existing pole piece is coated and baked to evaporate the solvent in the coating slurry, the electrode surface cracks due to the inconsistent evaporation rate. At the same time, the solvent in the electrode slurry floats unevenly, the battery cell capacity is reduced, and the electrical performance is affected. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is to provide a pole piece evaporation baking mechanism to address the deficiencies of the prior art, which can control the evaporation amount of pole piece coating and keep the real-time evaporation amount of slurry constant.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pole piece evaporation baking mechanism, comprising:

[0007] It includes an oven, an air supply structure, an air exhaust structure and a controller, wherein the air supply structure and the air exhaust structure are respectively connected to the air inlet and the air outlet of the oven through a delivery pipeline, and the controller is electrically connected to the oven, the air supply structure and the air exhaust structure;

[0008] Among them, the air supply structure includes a blower and a solution recovery tank connected to the output end of the blower, the solution recovery tank is connected to the input end of the conveying pipeline, the solution recovery tank is provided with a humidifying component, and a baffle is provided at one end of the solution recovery tank close to the conveying pipeline.

[0009] As an improvement of the electrode evaporation baking mechanism described in the utility model, a plurality of baffles are provided, and the plurality of baffles are arranged obliquely, and the height of the baffle away from the conveying pipeline to the baffle close to the conveying pipeline increases successively.

[0010] As an improvement of the electrode evaporation baking mechanism described in the utility model, the humidifying component includes a holding tank and an atomizing nozzle that are interconnected. The atomizing nozzle passes through the solution recovery tank and is located above the interior of the solution recovery tank. The humidifying component can ensure the humidity of the gas entering the delivery pipeline.

[0011] As an improvement of the electrode evaporation baking mechanism described in the utility model, the air supply structure further includes an air supply humidity detection element, and the air supply humidity detection element is arranged on a side where the conveying pipeline is connected to the air supply structure.

[0012] As an improvement of the electrode evaporation baking mechanism described in the utility model, the blower is connected to the solution recovery tank through an air supply pipe. The height of the connection between the air supply pipe and the solution recovery tank is greater than 100 mm from the bottom of the solution recovery tank, which can reduce the flow of solution condensate beads in the atomized lower layer to the delivery pipe.

[0013] As an improvement of the electrode evaporation baking mechanism described in the utility model, the height of the baffle away from the conveying pipe is flush with the center of the output port of the air supply pipe; the setting of the baffle can prevent the solution condensation beads in the atomized lower layer from entering the oven while ensuring smooth air circulation.

[0014] As an improvement of the electrode evaporation baking mechanism described in the utility model, the exhaust structure includes an exhaust fan and an exhaust humidity detection element, the output end of the exhaust fan is connected to the conveying pipeline, and the exhaust humidity detection element is located on the side where the conveying pipeline is connected to the exhaust structure.

[0015] As an improvement of the electrode evaporation baking mechanism described in the utility model, the oven is provided with an air outlet and an exhaust port, and a temperature detection element, a wind speed detection element and an electrode tape speed detection element are provided inside the oven.

[0016] As an improvement of the electrode evaporation baking mechanism described in the utility model, the controller includes an electrically connected collection unit, a comparison unit, a control unit and an alarm unit, the collection unit is used to store and transmit the real-time data transmitted by the oven, the air supply structure and the exhaust structure to the comparison unit, the comparison unit is used to compare the real-time data with the set value and transmit the comparison result to the control unit, the control unit is used to control the changes of parameters in the air supply structure, the exhaust structure and the oven, and the alarm unit is used to alarm.

[0017] The second purpose of the utility model is to provide a pole piece evaporation baking device, including the pole piece evaporation baking mechanism as described above.

[0018] The beneficial effect of the utility model lies in that the electrode evaporation baking mechanism of the utility model comprises an oven, an air supply structure, an exhaust structure and a controller, the air supply structure and the exhaust structure are respectively connected to the air inlet end and the air outlet end of the oven through a conveying pipe, and the controller is electrically connected to the oven, the air supply structure and the exhaust structure; wherein the air supply structure comprises a blower and a solution recovery tank connected to the output end of the blower, the solution recovery tank is connected to the input end of the conveying pipe, the solution recovery tank is provided with a humidifying component, and the solution recovery tank is provided with a baffle at one end close to the conveying pipe. The utility model can achieve control of the evaporation amount of electrode coating by setting an air supply structure, an exhaust structure and a controller, that is, by real-time monitoring of the parameters of the air entering and leaving the oven, and early warning to adjust the temperature, humidity and atomization amount of the air in the oven, so as to keep the real-time evaporation amount of the slurry constant and reduce the possibility of fracture of the electrode after baking; in addition, the setting of the solution recovery tank in the utility model can save the use of solution, and the setting of the baffle can prevent solution condensation from entering the oven while ensuring gas circulation, further preventing cracks or fractures from occurring on the surface of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is a structural schematic diagram of the controller in the utility model.

[0022] The reference numerals are described as follows:

[0023] 1- oven; 11- air outlet; 12- exhaust vent;

[0024] 2-air supply structure; 21-blower; 22-solution recovery tank; 23-humidification component; 231-holding tank; 232-atomizing nozzle; 24-baffle; 25-air supply humidity detection element; 26-air supply duct; 27-recovery duct;

[0025] 3-exhaust structure; 31-exhaust fan; 32-exhaust humidity detection element;

[0026] 4-controller; 41-collection unit; 42-comparison unit; 43-control unit; 44-alarm unit;

[0027] 5-Transportation pipeline;

[0028] H - height direction. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0031] Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0034] In the prior art, when the lithium-ion battery electrode is coated and baked to evaporate the solvent in the coating slurry, the electrode surface cracks due to the inconsistent evaporation rate. At the same time, the solvent in the electrode slurry floats unevenly, the battery capacity is reduced, and the electrical performance is affected. In order to improve this defect, the usual practice is to add a small amount of high-boiling point solvents (such as NMP, EC, alcohols, etc.) to the electrode slurry. However, high-boiling point solvents are not easy to evaporate, and the residual amount will have an adverse effect on the battery cycle performance and interface.

[0035] Controlling the evaporation amount in the oven can effectively improve the problem of coating cracking and the uneven floating of the solvent in the slurry. The main influencing factors of evaporation amount include humidity, wind speed, temperature, belt speed, etc. In view of this, the implementation method of the present application provides a technical solution. By setting a controller, an exhaust structure and an air supply structure to monitor the parameters of the air entering the oven and the air parameters exiting the oven in real time, and then adjusting according to the real-time data, the coating evaporation amount can be controlled, so that the real-time evaporation amount of the slurry remains constant, thereby avoiding the occurrence of electrode cracking.

[0036] The following is combined with Figures 1-2 The utility model is further described in detail with specific implementation modes, but is not intended to limit the utility model.

[0037] like Figure 1 As shown, a pole piece evaporation baking mechanism comprises an oven 1, an air supply structure 2, an exhaust structure 3 and a controller 4. The air supply structure 2 and the exhaust structure 3 are respectively connected to the air inlet and the air outlet of the oven 1 through a conveying pipe 5. The controller 4 is electrically connected to the oven 1, the air supply structure 2 and the exhaust structure 3. Figure 1 The single arrow in the figure represents the direction of gas flow.

[0038] Preferably, the air supply structure 2 includes a blower 21 and a solution recovery tank 22 connected to the output end of the blower 21, the solution recovery tank 22 is connected to the input end of the conveying pipe 5, and a recovery pipe 27 is provided below the solution recovery tank 22 in the height direction H. The recovery pipe 27 is used to connect the solution tank to collect the solution for recycling, and also to prevent the water level of the solution in the solution recovery tank 22 from being too high, resulting in the gas entering the conveying pipe 5 containing the solution or the humidity being uncontrollable; the solution recovery tank 22 is provided with a humidifying component 23, the humidifying component 23 includes a holding tank 231 and an atomizing nozzle 232 connected to each other, the atomizing nozzle 232 passes through the solution recovery tank 22 and is located above the interior of the solution recovery tank 22. In the present embodiment, three atomizing nozzles 232 are provided, which can be adjusted according to actual needs without specific settings.

[0039] In some embodiments, the solution recovery tank 22 is provided with a heating device and a temperature control device, which cooperate with the humidification component 23 to coordinate the humidity of the gas entering the delivery pipeline 5 .

[0040] It can be understood that the solution in the holding tank 231 is preferably NMP when the electrode is a positive electrode, and is preferably deionized water when the electrode is a negative electrode.

[0041] Preferably, the air supply structure 2 also includes an air supply humidity detection element 25, which is arranged on the side where the conveying pipe 5 is connected to the air supply structure 2, and the blower 21 is connected to the solution recovery tank 22 through the air supply pipe 26. The height of the connection between the air supply pipe 26 and the solution recovery tank 22 is greater than 100 mm from the bottom of the solution recovery tank 22, which can reduce the solution condensate beads in the atomized lower layer from flowing to the conveying pipe 5.

[0042] Preferably, a baffle 24 is provided at one end of the solution recovery tank 22 close to the conveying pipe 5, and a plurality of baffles 24 are provided. The plurality of baffles 24 are inclinedly arranged, and the heights of the plurality of baffles increase sequentially in the direction away from the conveying pipe 5 and closer to the conveying pipe 5. The height of the baffle 24 away from the conveying pipe 5 is flush with the center position of the output port of the air supply pipe 26. The baffle 24 gradually increases in height along the wind direction, while allowing smooth air circulation, it can intercept the sinking agglomerated solvent molecules, thereby preventing the solvent condensate beads of the atomized lower layer from entering the oven 1.

[0043] Preferably, the exhaust structure 3 includes an exhaust fan 31 and an exhaust humidity detection element 32 , the output end of the exhaust fan 31 is connected to the delivery pipe 5 , and the exhaust humidity detection element 32 is located on one side where the delivery pipe 5 is connected to the exhaust structure 3 .

[0044] In this embodiment, the inlet air humidity is controlled at a fixed value between 10% and 40%, and the exhaust air humidity is higher than the inlet air humidity by a fixed value between 5% and 20%, which can be adjusted according to actual conditions without specific limitation.

[0045] Preferably, the oven 1 is provided with an air outlet 11 and an exhaust port 12, and a temperature detection element, a wind speed detection element and a pole piece tape speed detection element are provided inside the oven 1.

[0046] like Figure 2As shown, the controller 4 includes an electrically connected collection unit 41, a comparison unit 42, a control unit 43 and an alarm unit 44, the collection unit 41 is used to store the real-time data transmitted by the oven 1, the air supply structure 2 and the exhaust structure 3 and transmit it to the comparison unit 42, the comparison unit 42 is used to compare the real-time data with the set value and transmit the comparison result to the control unit 43, the control unit 43 is used to control the change of parameters in the air supply structure 2, the exhaust structure 3 and the oven 1, and the alarm unit 44 is used to alarm. In this embodiment, the controller 4 uses PLC, and the functions of the collection unit 41, the comparison unit 42, the control unit 43 and the alarm unit 44 can be implemented by compiling corresponding programs using existing computer languages.

[0047] In this embodiment, the humidity of the gas entering and leaving the oven 1 is detected by the supply air humidity detection element 25 and the exhaust air humidity detection element 32. The controller 4 adjusts the temperature, intake air humidity, wind speed and temperature in the oven through real-time humidity data warning, thereby controlling the coating evaporation amount and keeping the real-time evaporation amount of the slurry constant.

[0048] Pole evaporation baking equipment

[0049] A pole piece evaporation baking device includes the pole piece evaporation baking structure as described above, wherein the pole pieces in the oven 1 are mostly transported by a conveyor belt. When the conveyor belt is used for transportation, the pole piece belt speed detection element in the oven 1 controls the belt speed to further prevent the pole piece from breaking.

[0050] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A pole piece evaporation baking mechanism, It is characterized in that The invention comprises an oven (1), an air supply structure (2), an air exhaust structure (3) and a controller (4), wherein the air supply structure (2) and the air exhaust structure (3) are respectively connected to the air inlet and the air outlet of the oven (1) through a delivery pipe (5), and the controller (4) is electrically connected to the oven (1), the air supply structure (2) and the air exhaust structure (3); The air supply structure (2) comprises a blower (21) and a solution recovery tank (22) connected to the output end of the blower (21); the solution recovery tank (22) is connected to the input end of the delivery pipe (5); the solution recovery tank (22) is provided with a humidifying component (23); and a baffle (24) is provided at one end of the solution recovery tank (22) close to the delivery pipe (5).

2. The electrode evaporation baking mechanism according to claim 1, It is characterized in that A plurality of baffles (24) are provided, and the plurality of baffles (24) are arranged obliquely, and the height of the baffle (24) away from the conveying pipeline (5) increases successively to the height of the baffle (24) close to the conveying pipeline (5).

3. The electrode evaporation baking mechanism according to claim 1, It is characterized in that The humidifying assembly (23) comprises a containing tank (231) and an atomizing nozzle (232) which are connected to each other. The atomizing nozzle (232) passes through the solution recovery tank (22) and is located above the interior of the solution recovery tank (22).

4. The electrode evaporation baking mechanism according to claim 1, It is characterized in that The air supply structure (2) further comprises an air supply humidity detection element (25), and the air supply humidity detection element (25) is arranged on a side where the conveying duct (5) is connected to the air supply structure (2).

5. The electrode evaporation baking mechanism according to claim 4, It is characterized in that The blower (21) is connected to the solution recovery tank (22) via an air supply pipe (26); in the height direction (H), the height position at which the air supply pipe (26) is connected to the solution recovery tank (22) is greater than 100 mm from the bottom of the solution recovery tank (22).

6. The electrode evaporation baking mechanism according to claim 5, It is characterized in that The height of the baffle (24) away from the delivery duct (5) is flush with the center position of the output port of the air supply duct (26).

7. The electrode evaporation baking mechanism according to claim 1, It is characterized in that The exhaust structure (3) comprises an exhaust fan (31) and an exhaust humidity detection element (32); the output end of the exhaust fan (31) is connected to the delivery pipe (5); and the exhaust humidity detection element (32) is located on a side where the delivery pipe (5) is connected to the exhaust structure (3).

8. The electrode evaporation baking mechanism according to claim 1, It is characterized in that The oven (1) is provided with an air outlet (11) and an exhaust port (12), and a temperature detection element, a wind speed detection element and a pole piece tape speed detection element are provided inside the oven (1).

9. The electrode evaporation baking mechanism according to claim 1, It is characterized in that The controller (4) comprises an electrically connected collection unit (41), a comparison unit (42), a control unit (43) and an alarm unit (44); the collection unit (41) is used to store real-time data transmitted by the oven (1), the air supply structure (2) and the exhaust structure (3) and transmit the data to the comparison unit (42); the comparison unit (42) is used to compare the real-time data with a set value and transmit the comparison result to the control unit (43); the control unit (43) is used to control the change of parameters in the air supply structure (2), the exhaust structure (3) and the oven (1); and the alarm unit (44) is used to alarm.

10. A pole piece evaporation baking equipment, It is characterized in that It comprises the pole piece evaporation baking structure as described in any one of claims 1 to 9.

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