Coating slurry supply system and coating device

Abstract

The utility model belongs to the technical field of lithium battery diaphragm production, and discloses a coating slurry supply system and a coating device. The coating slurry supply system comprises a material supply tank, a material return tank and a defoaming device, wherein a material supply outlet of the material supply tank can be arranged on a coating machine in a communicating manner and supplies materials to the coating machine; a material return inlet of the material return tank can be communicated with the coating machine and is used for accommodating slurry overflowing from the coating machine, and a material return outlet of the material return tank is communicated with a second feeding hole of the material supply tank; and the defoaming device is arranged in the material returning tank. According to the coating slurry supply system, the backflow slurry generated during coating can be treated, the slurry cost is reduced, bubbles of the backflow slurry can be reduced, impurities in the backflow slurry are removed, and the coating effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery separator production, in particular to a coating slurry supply system and a coating device. Background Art

[0002] The global new energy industry has developed rapidly, and the market demand for lithium-ion batteries in the fields of power batteries and energy storage has been continuously expanding. The lithium battery separator is one of the four major components of the lithium-ion battery, which affects the quality of the lithium-ion battery. To improve the heat resistance, liquid absorption rate of the separator and the adhesion to the electrode plate of the lithium battery separator, etc., slurry is usually coated on the base film.

[0003] At present, the coating feeding process uses a single feeding tank. When coating, the excess slurry will be concentrated in the feeding tank after reflux. Due to the high-speed shearing of the separator slurry in the cartridge during high-speed coating, a large number of bubbles are generated in the reflux slurry. The slurry with bubbles flows back into the feeding tank and accumulates, and then is mixed with the original slurry and supplied to the coater. Eventually, it will affect the coating effect of the coater, resulting in defects such as missed coating and bright spots on the coated separator.

[0004] Therefore, there is an urgent need to provide a new type of coating slurry supply system and coating device to solve the above technical problems in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a coating slurry supply system, which can process the reflux slurry generated during coating, thereby reducing the generation of bubbles in the reflux slurry, removing impurities in the reflux slurry, and improving the coating effect.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The coating slurry supply system includes a feeding tank, a return tank and a defoaming device. The feeding outlet of the feeding tank can be connected to the coater to supply materials to the coater; the return inlet of the return tank can be connected to the coater and is used to accommodate the excess reflux slurry inside the coater. The return outlet of the return tank is connected to the second feeding port provided on the feeding tank; the defoaming device is arranged inside the return tank.

[0008] Optionally, a buffer device is arranged at the connection of the inner wall of the return tank and at the return inlet. The slurry entering the return tank from the return inlet can enter the buffer device and flow along the inner wall of the return tank.

[0009] Optionally, the buffer device includes an impact inclined plane, the impact inclined plane is inclined at a preset angle, and the distance between the impact inclined plane and the inner wall of the return tank gradually decreases from top to bottom.

[0010] Optionally, the distance between the bottom end of the impact inclined plane and the inner wall of the return material tank is W, and W is adjustable.

[0011] Optionally, the adjustment range of W is from 1 mm to 5 mm.

[0012] Optionally, the included angle between the impact inclined plane and the inner wall of the return material tank is α, and 30° ≤ α ≤ 45°.

[0013] Optionally, the buffer device further includes a fixing plate disposed on the inner wall of the return material tank and above the return material inlet, and the top of the impact inclined plane is fixed to the bottom wall of the fixing plate.

[0014] Optionally, the return material inlet is opened at the top of the side wall of the return material tank.

[0015] Optionally, the defoaming device includes an ultrasonic defoamer, and the ultrasonic defoamer is vertically inserted into the return material tank.

[0016] Another object of the present invention is to provide a coating device, which includes the coating slurry supply system described in any of the above solutions.

[0017] Beneficial effects:

[0018] In the coating slurry supply system of the present invention, the coating slurry is provided to the coating machine through the supply tank. During the coating process, excess slurry will overflow. The excess slurry is recycled into the return material tank through the return material inlet, realizing the recycling and reuse of the excess slurry. The excess slurry is defoamed and broken in the return material tank through the defoaming device, so that the bubbles and large particles in the slurry are removed, and then it is poured into the supply tank for subsequent coating processes. Further, a buffer device can be provided in the return material tank to effectively reduce the slurry bubbles. The coating slurry supply system can process the reflux slurry generated during coating, reduce the slurry cost, and also reduce the generation of reflux slurry bubbles, remove impurities in the reflux slurry, and improve the coating effect. Description of the drawings

[0019] Figure 1 is a schematic diagram of the coating device provided by the specific embodiment of the present invention;

[0020] Figure 2 is Figure 1 the partial enlarged view at A in

[0021] Figure 3 is a top view of the supply tank provided by the specific embodiment of the present invention;

[0022] Figure 4 is a top view of the return material tank provided by the specific embodiment of the present invention.

[0023] In the figure:

[0024] 10. Coater; 11. Material tank; 12. Discharge hole;

[0025] 100. Feed tank; 101. Feed outlet; 102. First feed inlet; 103. Second feed inlet; 104. Ball valve; 111. Pneumatic pump; 112. Stirring paddle; 113. Feed and discharge port; 114. Liquid level sensor; 121. Feed pipe; 122. Connecting pipe; 130. Return port;

[0026] 200. Return material tank; 201. Return material outlet; 202. Return material inlet; 210. Defoaming device; 220. Buffer device; 221. Impact inclined plane; 222. Diversion surface; 223. Fixed plate; 224. Fixed bolt; 230. Return material discharge port; 240. Return material inspection port; 250. Return material pipe;

[0027] 310. Electric diaphragm pump; 320. Second filter; 330. First filter; 340. Iron removal device; 350. Pressure gauge. Detailed implementation manners

[0028] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are merely for explaining the present utility model and not for limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0029] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0031] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] Please refer to Figure 1 , in this embodiment, the coating slurry supply system includes a feed tank 100, a return tank 200 and a defoaming device 210. The feed outlet 101 of the feed tank 100 can be connected to the coater 10 and supply material to the coater 10; the return inlet 202 of the return tank 200 can be connected to the coater 10 and is used to accommodate the slurry overflowed from the coater 10. The return outlet 201 of the return tank 200 is connected to the second feed inlet 103 of the feed tank 100; the defoaming device 210 is arranged inside the return tank 200.

[0033] The coating slurry supply system in this embodiment provides coating slurry to the coater 10 through the feed tank 100. During the coating process of the coater 10, there will be excess slurry overflowing. The excess slurry is accommodated in the return tank 200 through the return inlet 202, realizing the recovery and reuse of the excess slurry. The excess slurry is defoamed and broken by the defoaming device 210 in the return tank 200, so that the bubbles and large particles in the slurry are removed, and then it is poured into the feed tank 100 for subsequent coating processes. This coating slurry supply system can process the reflux slurry generated during coating, reduce the slurry cost, and also reduce the generation of bubbles in the reflux slurry, remove impurities in the reflux slurry, and improve the coating effect.

[0034] In this embodiment, the feed outlet 101 of the feed tank 100 is connected to the material tank 11 of the coater 10. During coating, the excess slurry is stored in the material tank 11 and discharged into the return pipe 250 through the discharge hole 12 opened at the bottom of the material tank 11, and flows through the return pipe 250 to the return tank 200 for subsequent recovery and treatment.

[0035] Such as Figure 1 and Figure 2As shown, further, a buffer device 220 is provided on the inner wall of the above-mentioned return material tank 200 and below the above-mentioned return material inlet 202. The slurry entering the return material tank 200 from the above-mentioned return material inlet 202 can wash the buffer device 220 and flow along the inner wall of the return material tank 200. The setting of the buffer device 220 can prevent the reflux slurry from directly impacting the inner wall of the return material tank 200 when flowing into the return material tank 200 from the return material inlet 202. Instead, it flows downward along the inner wall, reducing the generation of bubbles when the slurry impacts the inner wall, improving the quality of the slurry, reducing the processing cost, and enhancing the subsequent coating effect.

[0036] Specifically, the above-mentioned buffer device 220 includes an impact inclined surface 221. The impact inclined surface 221 is inclined at a preset angle, and the distance between the impact inclined surface 221 and the inner wall of the return material tank 200 gradually decreases from top to bottom. Thus, when the reflux slurry enters the return material tank 200, it first impacts the inclined impact inclined surface 221, and the impact force is buffered by the impact inclined surface 221, reducing the generation of bubbles caused by direct impact. Then, it flows along the impact inclined surface 221 towards the inner wall of the return material tank 200 and flows to the bottom of the return material tank 200 along the inner wall of the return material tank 200, avoiding the generation of bubbles during the process of the reflux slurry pouring in.

[0037] In this embodiment, the distance between the bottom end of the above-mentioned impact inclined surface 221 and the inner wall of the return material tank 200 is W, and W is adjustable. Further, the adjustment range of W is from 1 mm to 5 mm. The adjustable distance between the bottom end of the impact inclined surface 221 and the inner wall of the return material tank 200 enables the return material tank 200 to be suitable for the recovery and utilization of different types of slurries, ensuring that slurries with smaller particles and larger particles can both be recovered and utilized. It can also increase the distance when the flow rate of the reflux slurry is large and decrease the distance when the flow rate of the reflux slurry is small, thereby effectively reducing foam and avoiding blocking the return material inlet 202. The value of this distance W is determined by the properties of the reflux slurry. For example, it can be selected as 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm according to the particle size of the slurry or the flow rate of the reflux slurry. No specific limitation is made here.

[0038] Further, the included angle between the impact inclined surface 221 and the inner wall of the return material tank 200 is α, and its preferred value range is from 30° to 45°, which will not be elaborated here.

[0039] Optionally, the above buffer device 220 further includes a fixing plate 223 disposed on the inner wall of the above return material tank 200 and above the above return material inlet 202, and the top of the above impact inclined surface 221 is fixed to the bottom wall of the above fixing plate 223. In this embodiment, the impact inclined surface 221 is the inclined surface part of a cavity box body with a triangular longitudinal section, and the top of the cavity box body is fixed to the bottom wall of the fixing plate 223 through fixing bolts 224, ensuring the connection stability between the buffer device 220 and the inner wall of the return material tank 200. At the same time, through the cooperation of the fixing bolts 224 and the fixing plate 223, the distance between the bottom end of the impact inclined surface 221 and the inner wall of the above return material tank 200 can be adjusted.

[0040] Preferably, the bottom of the impact inclined surface 221 can extend downward until the lower half of the return material tank 200, so as to better play a guiding role and reduce the generation of bubbles, which will not be elaborated here.

[0041] In another alternative embodiment, the above buffer device 220 further includes a guiding surface 222, and the above guiding surface 222 is arranged parallel to the inner wall of the above return material tank 200; the above guiding surface 222 is provided with an avoidance hole facing the above return material inlet 202, and the bottom of the above guiding surface 222 is provided with a material leakage hole. That is to say, the buffer device 220 is a closed triangular box body with a cavity, one side surface of which is attached to the inner wall of the return material tank 200. After the refluxed slurry impacts the impact inclined surface 221, it is rebounded onto the guiding surface 222 and flows downward along the guiding surface 222, and then flows downward along the inner wall of the return material tank 200, without directly impacting the inner wall of the return material tank 200, further reducing the generation of bubbles. Thus, the distance between the guiding surface 222 and the bottom of the impact inclined surface 221 is adjustable, and the adjustable range of the distance is also 1 mm to 5 mm.

[0042] Please continue to refer to Figure 1 , the above return material inlet 202 is opened at the top of the side wall of the above return material tank 200. Setting the return material inlet 202 at the lower part of the return material tank 200 will cause the bubbles carried by the refluxed slurry to enter the clean slurry that has been processed at the bottom of the return material tank 200, thus affecting the quality of the slurry flowing from the return material tank 200 into the supply tank 100. However, entering the return material tank 200 from the upper part ensures that the bubbles carried by the refluxed slurry are concentrated in the upper and middle parts of the slurry in the return material tank 200, ensuring that there are no bubbles in the middle and lower layers of the slurry and improving the supply quality.

[0043] Optionally, the above defoaming device 210 includes an ultrasonic defoamer, and the ultrasonic defoamer is vertically inserted into the above return material tank 200. The ultrasonic defoamer uses ultrasonic waves to disperse the refluxed slurry in the return material tank 200, so that the bubbles in the refluxed slurry float above the slurry liquid surface and defoam. Ultrasonic waves can also disperse large particles in the slurry, effectively reducing the agglomeration and sedimentation of the refluxed slurry.

[0044] It should be noted that the return tank 200 and the feed pipe 100 are connected by a connecting pipe 122. Ball valves 104 are respectively arranged at both ends of the connecting pipe 122 to control the opening and closing of the connecting pipe 122, the discharging of the return tank 200, and the feeding state of the reflux slurry of the feed tank 100. The connecting pipe 122 is selected as a flexible pipe here.

[0045] In this embodiment, a return discharging port 230 is arranged at the bottom of the return tank 200, so that when the return tank 200 needs to be overhauled, all the slurry in the return tank 200 can be discharged to avoid affecting the overhaul. Similarly, a feed discharging port 113 is arranged at the bottom of the feed tank 100, which will not be elaborated here.

[0046] The first feed inlet 102 of the feed tank 100 is connected to an external material tank through a feed pipe 121 to realize the feeding of the slurry. The first feed inlet 102 is located at the middle and lower position of the feed tank 100, effectively reducing the bubbles caused by the impact of the slurry entering the feed tank 100.

[0047] A stirring paddle 112 is also arranged in the feed tank 100. The stirring paddle 112 is used to completely mix the slurry in the feed tank 100, remove bubbles, and break large particles to ensure the feeding quality of the slurry. Specifically, the stirring paddle 112 is driven by a pneumatic pump 111 at the top of the feed tank 100, which will not be elaborated here, effectively reducing the agglomeration and sedimentation of the slurry. The stirring paddle 112 can preferably be an anchor type, paddle type, etc. A level sensor 114 is also equipped at the bottom of the feed tank 100, specifically such as a weighing sensor or an ultrasonic level gauge, to automatically obtain the liquid level in the feed tank 100, thus facilitating the automatic feeding of the slurry.

[0048] Further, a ball valve 104, a first filter 330, an electric diaphragm valve, a second filter 320, a deironing device 340, and a pressure gauge 350 are successively arranged at the feed discharging port 113 of the feed tank 100. The ball valve 104 is used to control the opening and closing of the feed discharging port 113. The first filter 330 is used to remove large particle foreign matters from the slurry coming out of the feed tank 100 to prevent the feed diaphragm pump from being worn. The electric diaphragm pump 310 is used to provide power for the slurry flow to ensure that enough slurry enters the coater 10. The second filter 320 is used to filter small foreign matters in the slurry, such as slurry blocks, etc. The deironing device 340 is a device composed of three magnetic bars, which is used to adsorb metal foreign matters in the slurry. And the pressure gauge 350 is used to detect the pressure of the slurry pipeline.

[0049] As Figure 3 and Figure 4 shown, a return overhaul opening 240 is arranged at the top of the return tank 200, and a feed overhaul opening is arranged at the top of the feed tank 100, so as to observe and maintain the inside of the return tank 200 and the feed tank 100, avoid affecting the feeding quality, and improve the maintenance efficiency.

[0050] Furthermore, the feeding tank 100 is originally provided with a reflux port 130 for directly introducing the reflux slurry into the feeding tank 100. However, this method generates a relatively large number of bubbles. Therefore, the reflux slurry is introduced into the return material tank 200, processed, and then introduced into the feeding tank 100. At this time, the reflux port 130 can be closed.

[0051] Another object of the present invention is to provide a coating device, which includes the coating slurry supply system described in any of the above solutions. The coating device has all the beneficial effects of the coating slurry supply system described in any of the above solutions, which will not be elaborated here. Specifically. The coating device uses the above coating slurry supply system for feeding, which can process the reflux slurry generated during coating, reduce the slurry cost, and also reduce the generation of bubbles in the reflux slurry, remove impurities in the reflux slurry, and improve the coating effect.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Coating slurry supply system, characterized in that, Comprising: A feeding tank (100), the feeding outlet (101) of the feeding tank (100) can be connected to the coater (10) to supply material to the coater (10); A return tank (200), the return inlet (202) of the return tank (200) can be connected to the coater (10) and is used to accommodate the excess reflux slurry inside the coater (10), and the return outlet (201) of the return tank (200) is connected to the second feeding port (103) provided on the feeding tank (100); A defoaming device (210), the defoaming device (210) is arranged inside the return tank (200).

2. The coating slurry supply system according to claim 1, wherein A buffer device (220) is arranged at the connection part of the inner wall of the return tank (200) and at the return inlet (202). The slurry entering the return tank (200) from the return inlet (202) enters the buffer device (220) and flows along the inner wall of the return tank (200).

3. The coating slurry supply system according to claim 2, characterized in that, The buffer device (220) includes an impact inclined plane (221), the impact inclined plane (221) is inclined at a preset angle, and the distance between the impact inclined plane (221) and the inner wall of the return tank (200) gradually decreases from top to bottom.

4. The coating slurry supply system according to claim 3, characterized in that, The distance between the bottom end of the impact inclined plane (221) and the inner wall of the return tank (200) is W, and W is adjustable.

5. The coating slurry supply system according to claim 4, wherein, The adjustment range of W is from 1 mm to 5 mm.

6. The coating slurry supply system according to claim 3, wherein, The included angle between the impact inclined plane (221) and the inner wall of the return tank (200) is α, 30° ≤ α ≤ 45°.

7. The coating slurry supply system according to claim 2, wherein The buffer device (220) further includes a fixing plate (223) arranged on the inner wall of the return tank (200) and above the return inlet (202), and the top of the impact inclined plane (221) is fixed to the bottom wall of the fixing plate (223).

8. The coating slurry supply system according to any one of claims 1-7, characterized in that, The return inlet (202) is opened at the top of the side wall of the return tank (200).

9. The coating slurry supply system according to any one of claims 1-7, characterized in that, The defoaming device (210) includes an ultrasonic defoamer, and the ultrasonic defoamer is vertically inserted into the return tank (200) internally.

10. Coating device, characterized in that, Including the coating slurry supply system according to any one of claims 1-9.

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