A lithium battery aqueous negative electrode coating and drying system

Abstract

The application discloses a kind of lithium battery water system negative electrode coating drying system, including tunnel type oven box, spraying device, adjustable air nozzle and detection device, tunnel type oven box left and right sides are respectively symmetrically opened with feed inlet and discharge port, water system negative electrode is driven and set between feed inlet and discharge port, two groups of mounting plates are fixedly installed in the inside of tunnel type oven box on the upper and lower sides of water system negative electrode, a plurality of air inlets are equidistantly opened on two groups of mounting plates, adjustable air nozzle is installed in the outside of each air inlet, detection device includes at least four groups of temperature and humidity sensors, temperature and humidity sensors are installed between adjustable air nozzle at intervals, spraying device is installed on the upper and lower places of tunnel type oven box at feed inlet place.The advantage of the present application is that water can be sprayed on the surface of the foil of the water system negative electrode before slurry coating, which replaces the slurry through the oven first to increase the humidity in the tunnel type oven, so that the humidity and temperature in the oven quickly reach the working state, avoiding the subsequent dry cracking.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery production, in particular to a lithium battery water-based negative electrode coating and drying system. BACKGROUND

[0002] Lithium batteries, as green energy, are being vigorously promoted nationwide, but the main obstacle in the development process is the complex production process and the difficulty in constructing automated and intelligent production lines. Among them, the heating and drying device of the battery pole piece coating machine is a very important link. The heating and drying device is connected by several independent operation ovens.

[0003] In the drying system, normal temperature air is heated by the heating device and becomes hot air which enters the oven static pressure air chamber through the air inlet. The hot air forms a hot air jet through the oven air nozzle, and after fully contacting the wet material on the pole piece, a mass transfer and heat transfer process occurs, thereby the solvent in the wet material is discharged through the air outlet. Then the water-based negative electrode of the lithium battery is coated at the initial stage, the humidity in the drying system is lower than that in continuous production, the pole piece is dried faster, and the appearance of the pole piece is prone to dry cracking when the coating is started. SUMMARY

[0004] The purpose of the present application is to provide a lithium battery water-based negative electrode coating and drying system which can spray water on the surface of the foil of the water-based negative electrode before the slurry is coated, replace the slurry through the oven drying to improve the humidity in the tunnel oven, so that the humidity and temperature in the oven reach the working state quickly, and avoid the dry cracking in the subsequent process.

[0005] The above technical purpose of the present application is realized by the following technical scheme:

[0006] A lithium battery water-based negative electrode coating and drying system, characterized in that it comprises a tunnel oven box, a spraying device, an adjustable air guide nozzle and a detection device, the top and the top of the tunnel oven box are respectively connected with an upper air inlet and a lower air inlet, the left and right sides of the tunnel oven box are respectively symmetrically provided with an inlet and an outlet, a water-based negative electrode is transmissionally arranged between the inlet and the outlet, two groups of exhaust ports are arranged on the left and right sides below the inlet and the outlet at the rear of the tunnel oven box, two groups of mounting plates are fixedly installed on the upper and lower sides of the water-based negative electrode inside the tunnel oven box, the mounting plates are respectively an upper air chamber and a lower air chamber between the upper air inlet and the lower air inlet, a plurality of air guide ports are equidistantly arranged on the mounting plates, the adjustable air guide nozzle is installed outside each group of air guide ports, the detection device comprises at least four groups of temperature and humidity sensors, the temperature and humidity sensors are intervally installed between the adjustable air guide nozzles, and the spraying device is installed on the upper and lower parts of the tunnel oven box at the inlet.

[0007] Preferably, a uniform flow screen plate is installed in each group of air guide ports.

[0008] Preferably, a plurality of fixed flow guides with different slopes and symmetrical arrangement are installed in the upper air inlet and the lower air inlet.

[0009] Preferably, two groups of mounting seats are arranged on both sides of the mounting plate of the water-based negative electrode lower part, and a roller is mounted on the top of the mounting seat and closely attached to the water-based negative electrode lower part.

[0010] Preferably, the adjustable air guide nozzle comprises an air guide cylinder and movable flow guides, the air guide cylinder is open at the top and bottom, and one end is fixedly connected with the air guide port, the movable flow guides are provided in two groups, one end of the two groups of movable flow guides is hinged through a rotating shaft, the air guide cylinder sidewall is provided with longitudinal movable guide grooves at both ends of the rotating shaft, the other end of the two groups of movable flow guides is provided with a movable block, the air guide cylinder sidewall is provided with transverse movable guide grooves at the movable block, and the movable block slides transversely along the transverse movable guide grooves.

[0011] Preferably, one end of the rotating shaft is provided with a screw rod, the screw rod is in threaded transmission connection with the inside of the rotating shaft, the screw rod is in relative rotation connection with the inside of the air guide cylinder through a bearing seat at both ends, and one end of the screw rod is in transmission connection with a first motor.

[0012] Preferably, two groups of synchronous opening and closing push-pull plates are arranged on the inner sides of the upper air chamber and the lower air chamber, the bottom of the two groups of push-pull plates is slidably mounted on both sides of the air guide port through slide rails, a double-thread rod is rotatably mounted above the two groups of push-pull plates, two groups of screw grooves with opposite directions are symmetrically arranged on the double-thread rod, a transmission block is fixedly mounted on the upper part of each of the two groups of push-pull plates, the transmission blocks are in transmission connection with the two groups of screw grooves on the double-thread rod for synchronous centering movement, a second motor is fixedly mounted on the mounting plate on one side of each of the air guide ports, and the second motor is in transmission connection with one end of the double-thread rod.

[0013] Preferably, the spraying device comprises a compressed gas pump, a water tank and a spray head, the water tank is mounted above the tunnel type oven body, the compressed gas pump is mounted in the tunnel type oven body above the feeding port, the spray head is provided in two groups and is oppositely mounted on the upper and lower sides of the water-based negative electrode, and the spray head and the water tank are connected with the compressed gas pump.

[0014] Preferably, it further comprises a controller, the controller receives the temperature and humidity values detected by the temperature and humidity sensor, and adjusts the first motor and the second motor of the two groups of air guide ports on both sides corresponding to the temperature and humidity sensor according to the temperature and humidity values.

[0015] In conclusion, the present application has the following advantages: the present application can replace the slurry through the oven drying before the slurry coating by spraying water on the foil surface of the water-based negative electrode, improve the humidity in the tunnel oven, and according to the temperature and humidity in the tunnel oven, adjust the air outlet to speed up the evaporation of water vapor, so that the humidity and temperature in the box reach the working state quickly, and avoid the subsequent dry cracking. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure schematic diagram of the present application;

[0017] Figure 2 is Figure 1 the structure schematic diagram of A in the present application;

[0018] Figure 3 is the connection structure schematic diagram of the push-pull plate in the present application. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be further described below in combination with the drawings, and the embodiments do not constitute a limitation on the present application.

[0020] As Figures 1 to 3 shown, a lithium battery water-based negative electrode coating drying system includes a tunnel oven box body 1, a spraying device, an adjustable air nozzle, and a detection device, the top and the top of the tunnel oven box body 1 are respectively connected with an upper air inlet 2 and a lower air inlet 3, the left and right sides of the tunnel oven box body 1 are respectively symmetrically provided with an inlet 4 and an outlet 5, a water-based negative electrode 6 is drivingly arranged between the inlet 4 and the outlet 5, two groups of exhaust ports 7 are respectively arranged on the left and right sides below the inlet 4 and the outlet 5 at the rear of the tunnel oven box body 1, two groups of mounting plates 8 are fixedly installed on the upper and lower sides of the water-based negative electrode 6 inside the tunnel oven box body 1, the upper and lower air chambers 9 and 10 are respectively arranged between the two groups of mounting plates 8 and the upper air inlet 2 and the lower air inlet 3, a plurality of air outlets 11 are equidistantly arranged on the two groups of mounting plates 8, the adjustable air nozzle is installed outside each group of air outlets 11, the detection device includes at least four groups of temperature and humidity sensors 12, the temperature and humidity sensors 12 are installed between the adjustable air nozzles at intervals, and the spraying device is installed on the upper and lower parts of the tunnel oven box body 1 at the inlet 4.

[0021] A uniform flow net plate 13 is installed in each group of air outlets 11 to realize balanced air intake.

[0022] A plurality of fixed flow guide plates 14 with different slopes and symmetrically arranged are installed in the upper air inlet 2 and the lower air inlet 3, so that the air intake of each group of air outlets is relatively balanced.

[0023] Two groups of mounting seats 15 are arranged on both sides of the mounting plate 8 below the water-based negative electrode 6, and a plurality of supporting rollers 16 are arranged on the top of the mounting seats 15, and the supporting rollers 16 are in close contact with the lower part of the water-based negative electrode 6, so as to avoid the water-based negative electrode 6 from being bent or falling, thereby affecting the subsequent coating effect.

[0024] The adjustable air guide nozzle comprises an air guide cylinder 17 and a movable guide plate 18, the air guide cylinder 17 is open at the top and bottom, and one end of the air guide cylinder 17 is fixedly connected with the air guide port 11, and the movable guide plate 18 is provided with two groups, one end of the two groups of movable guide plates 18 is hinged through a rotating shaft 19, the side wall of the air guide cylinder 17 is provided with a longitudinal movable guide groove 20 at both ends of the rotating shaft 19, the other end of the two groups of movable guide plates 18 is provided with a movable block 21, and the side wall of the air guide cylinder 17 is provided with a transverse movable guide groove 22 at the movable block 21, and the movable block 21 slides transversely in the transverse movable guide groove 22.

[0025] One end of the rotating shaft 19 is provided with a screw rod 23, the screw rod 23 is in threaded transmission connection with the inside of the rotating shaft 19, the screw rod 23 is in relative rotation connection with the inside of the air guide cylinder 17 through a bearing seat at both ends of the screw rod 23, and one end of the screw rod 23 is in transmission connection with a first motor 24.

[0026] The air guide port 11 is provided with two groups of synchronous opening and closing push-pull plates 25 inside the upper air chamber 9 and the lower air chamber 10, the bottom of the two groups of push-pull plates 25 is slidably installed on both sides of the air guide port 11 through a slide rail, a double-thread rod 26 is rotatably installed above the two groups of push-pull plates 25, two groups of thread grooves with opposite directions are symmetrically formed on the double-thread rod 26, a transmission block 27 is fixedly installed on the upper part of each group of push-pull plates 25, the transmission block 27 is in transmission connection with the two groups of thread grooves on the double-thread rod 26 for synchronous centering movement, and a second motor 28 is fixedly installed on one side of each group of air guide ports 11 on the mounting plate 8, and the second motor 28 is in transmission connection with one end of the double-thread rod 26.

[0027] The spraying device comprises a compressed air pump 29, a water tank 30 and a spraying head 31, the water tank 30 is installed above the tunnel type oven body 1, the compressed air pump 29 is installed in the tunnel type oven body 1 above the feeding port 4, the spraying head 31 is provided with two groups, and is respectively installed on the upper and lower sides of the water-based negative electrode 6, and the spraying head 31 and the water tank 30 are connected with the compressed air pump 29.

[0028] The controller receives the temperature and humidity values detected by the temperature and humidity sensor 12, and adjusts the first motor 24 and the second motor 28 of the two groups of air guide ports 11 corresponding to the temperature and humidity sensor 12 and the compressed air pump 29 according to the temperature and humidity values.

[0029] The present application can replace the slurry through spraying water on the surface of the foil of the water-based negative electrode before slurry coating, dry the slurry through the oven to improve the humidity in the tunnel oven, and adjust the air outlet to accelerate the evaporation of water vapor according to the temperature and humidity in the tunnel oven, so that the humidity and temperature in the oven reach the working state rapidly, and the dry cracking in the subsequent process is avoided.

[0030] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be considered to fall within the protection scope of the technical solutions of the present application.

Claims

1. A lithium battery aqueous-based negative electrode coating drying system, characterized in that, The utility model provides a kind of tunnel type oven, including tunnel type oven body, spraying device, adjustable air nozzle and detection device, the upper air inlet and lower air inlet are respectively connected in the top of the tunnel type oven body, the left and right sides of the tunnel type oven body are respectively symmetrically provided with feed inlet and discharge outlet, water series negative electrode is driven and arranged between the feed inlet and discharge outlet, two groups of exhaust ports are respectively arranged in the rear of the tunnel type oven body below the left and right sides of feed inlet and discharge outlet, two groups of mounting plates are fixedly installed in the inside of the tunnel type oven body on the upper and lower sides of water series negative electrode, the upper air chamber and lower air chamber are respectively between two groups of mounting plates and upper air inlet, lower air inlet, a plurality of air guide inlets are equidistantly provided on two groups of mounting plates, adjustable air nozzle is installed outside each group of air guide inlet, the detection device includes at least four groups of temperature and humidity sensors, temperature and humidity sensors are installed between adjustable air nozzle, spraying device is installed on the upper and lower places of tunnel type oven body at feed inlet place; A plurality of fixed flow guide plates with different slopes and symmetrically arranged are installed in the upper air inlet and lower air inlet. The adjustable air nozzle includes air duct and movable flow guide plate, the air duct is open at top and bottom, and one end is fixedly connected with air guide inlet, the movable flow guide plate is provided with two groups, one end of two groups of movable flow guide plate is hinged through pivot, longitudinal movable guide slot is arranged on the side wall of air duct at both ends of pivot, the other end of two groups of movable flow guide plate is provided with movable block, transverse movable guide slot is formed in the side wall of air duct at movable block, the movable block slides in transverse direction along transverse movable guide slot. Two groups of push-pull plates that open and close synchronously are arranged inside the air guide inlet in the upper air chamber and lower air chamber, the bottom of two groups of push-pull plates is slidably installed on both sides of air guide inlet through slide rail, a double-thread rod is rotatably installed above two groups of push-pull plates, two groups of thread grooves with opposite directions are symmetrically formed on the double-thread rod, a transmission block is fixedly installed on the upper part of two groups of push-pull plates, the transmission block is in transmission connection with two groups of thread grooves on the double-thread rod to move synchronously and centrally, a second motor is fixedly installed on one side of each group of air guide inlet on the mounting plate, and the second motor is in transmission connection with one end of the double-thread rod.

2. The lithium battery aqueous negative electrode coating drying system according to claim 1, characterized in that: An even-flow net plate is installed in each group of air guide inlet.

3. The system according to claim 1, wherein the system is characterized by: Two groups of mounting seats are arranged on both sides of the mounting plate below the water series negative electrode, a carrier roller is installed on the top of the mounting seat, and the carrier roller is in close contact with the lower part of the water series negative electrode.

4. The system according to claim 1, wherein the system is characterized by: A screw rod is arranged at one end of the pivot in a penetrating manner, the screw rod is in internal screw transmission connection with the pivot, the screw rod is in relative rotation connection with the inside of the air duct through bearing seat at both ends, and a first motor is in transmission connection with one end of the screw rod.

5. The system according to claim 1, wherein the system is characterized by: The spraying device includes a compressed air pump, a water tank and a spray head, the water tank is installed above the tunnel type oven body, the compressed air pump is installed in the tunnel type oven body above the feed inlet, the spray head is provided with two groups and is oppositely installed on the upper and lower sides of the water series negative electrode, and the spray head, the water tank and the compressed air pump are connected respectively.

6. The lithium battery aqueous negative electrode coating drying system according to claim 4, characterized in that: The controller receives the temperature and humidity values detected by the temperature and humidity sensor, and adjusts the compressed air pump, the first motor and the second motor of the two groups of air outlets on the two sides corresponding to the temperature and humidity sensor according to the temperature and humidity values.

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