Slurry feeding device and pole piece coating system

Abstract

The utility model relates to the technical field of secondary battery production equipment, in particular to a sizing agent feeding device and a pole piece coating system.The sizing agent feeding device comprises a sizing agent trolley, a sizing agent feeding device and a pole piece coating system, the sizing agent trolley is provided with a tank body used for storing sizing agent, and the tank body is provided with a feeding port and a discharging port; the weighing unit is used for measuring the weight of the slurry in the tank body; the volume detection unit is used for measuring the volume of the slurry in the tank body; and the first data processing unit is used for calculating the density of the slurry in the tank body according to data signals detected by the weighing unit and the volume detection unit. Compared with the prior art, the sizing agent in the sizing agent trolley can be monitored on line, whether the solid content of the sizing agent changes or not can be seen through the detected density of the sizing agent, then control over the follow-up coating procedure can be facilitated according to the data, and then the consistency of pole piece coating is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to secondary battery production equipment technical field, and more specifically, it relates to a kind of slurry feeding device with the function of detecting slurry density and pole piece coating system. BACKGROUND

[0002] Pole piece coating system is one of the most important equipment in the production process of secondary battery, and its main function is to uniformly coat the slurry on the pole piece substrate to form a coating with specific thickness and uniformity. The slurry trolley is a device used in the coating system to provide slurry to the pole piece.

[0003] For battery slurry, it needs to have good stability, which is an important indicator to ensure the consistency of the battery in the production process. After the mixing is completed, the stirring stops, and after a long time, the slurry will appear settlement, flocculation and other phenomena, resulting in large particles, which will have a great impact on the subsequent coating process. There is no device on the market for online monitoring of the coated slurry to control the surface density of the pole piece, such as the double-sided coating device for separator film disclosed in CN109382259A. The general practice is to detect the surface density of the coated pole piece, that is, during the pole piece coating process, if the solid content of the slurry changes, the surface density of the pole piece coating will fluctuate, at which time the detection is carried out, and according to the measured surface density value, it is judged whether to control the pumping speed of the slurry (the speed of the slurry coated on the pole piece). Although this control method has improved the quality of pole piece coating to some extent, there are still defective products. SUMMARY

[0004] The main purpose of the utility model is to provide a slurry feeding device with the function of detecting slurry density and a pole piece coating system to solve the technical problems mentioned in the background art.

[0005] To solve the above technical problems, on the one hand, the utility model provides a slurry feeding device, which comprises:

[0006] The slurry trolley has a tank for storing slurry, and the tank is provided with an inlet and an outlet;

[0007] The weighing unit is used to measure the weight of the slurry in the tank;

[0008] The volume detection unit is used to measure the volume of the slurry in the tank;

[0009] And the first data processing unit calculates the density of the slurry in the tank based on the data signals detected by the weighing unit and the volume detection unit.

[0010] In the technical solution, further, the tank body is movably arranged on the slurry trolley in the vertical direction, the weighing unit is a gravity sensor, and is arranged on the outer bottom of the tank body.

[0011] In any of the above technical solutions, further, the slurry trolley is provided with a mounting frame, and the slurry trolley is movably arranged on the mounting frame in the vertical direction.

[0012] In any of the above technical solutions, further, the volume detection unit comprises:

[0013] a liquid level sensor arranged in the tank body and used for detecting the liquid level of the slurry in the tank body;

[0014] and a second data processing unit configured to calculate the volume of the slurry in the tank body according to the data signal detected by the liquid level sensor.

[0015] In any of the above technical solutions, further, the slurry trolley further comprises:

[0016] a stirrer arranged in the tank body and used for stirring the slurry in the tank body.

[0017] In any of the above technical solutions, further, the slurry trolley further comprises:

[0018] a first control unit electrically connected with the first data processing unit and the stirrer, and configured to control the operating state of the stirrer according to the density value of the slurry calculated by the first data processing unit.

[0019] In any of the above technical solutions, further, a feeding pipe is arranged on the feeding port, and one end of the feeding pipe located in the tank body is close to the inner bottom of the tank body.

[0020] In any of the above technical solutions, further, the slurry trolley further comprises:

[0021] a coating pump connected with the discharging port of the tank body and used for pumping the slurry in the tank body to the coating surface of the pole piece.

[0022] In any of the above technical solutions, further, the slurry trolley further comprises:

[0023] a second control unit electrically connected with the first data processing unit and the coating pump, and configured to control the speed of the coating pump according to the density value of the slurry calculated by the first data processing unit.

[0024] In another aspect, a pole piece coating system is also provided, wherein the slurry feeding device with the function of detecting the density of the slurry in any of the above technical solutions is used to coat the slurry on the pole piece.

[0025] Beneficial effects: compared with the prior art, the application can monitor the slurry in the slurry trolley online, the density of the detected slurry can be seen to see whether the solid content of the slurry changes, and then the subsequent coating process can be controlled according to the data, thereby ensuring the consistency of the pole piece coating. BRIEF DESCRIPTION OF DRAWINGS

[0026] 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 needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only represent some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0027] Fig. 1 is a structural schematic diagram of the slurry feeding device of the present application;

[0028] Fig. 2 is a structural schematic diagram of the internal structure of the slurry feeding device of the present application;

[0029] Fig. 3 is a control flowchart of the present application.

[0030] The following explains the reference signs:

[0031] 1, slurry trolley; 2, tank body; 21, feeding port; 211, feeding pipe; 22, discharging port; 31, gravity sensor; 41, liquid level sensor; 42, second data processing unit; 5, first data processing unit; 6, mounting frame; 7, stirrer; 8, first control unit; 9, coating pump; 10, second control unit. DETAILED DESCRIPTION

[0032] The following will describe the example embodiments according to the present application in detail with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described here. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort are within the scope of protection of the present application.

[0033] It should be noted that, as shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an" and / or "the" do not specifically refer to the singular, but also include the plural. Generally speaking, the terms "include" and "contain" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0034] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] The following embodiments will be used to provide a detailed description of the slurry feeding device and electrode coating system of this application.

[0038] Example 1:

[0039] like Figs. 1-3 As shown, this embodiment proposes a slurry feeding device, including: a slurry trolley 1, which has a tank 2 for storing slurry, the tank 2 being provided with an inlet 21 and an outlet 22; a weighing unit for measuring the weight of the slurry in the tank 2; a volume detection unit for measuring the volume of the slurry in the tank 2; and a first data processing unit 5 for calculating the density of the slurry in the tank 2 based on the data signals detected by the weighing unit and the volume detection unit.

[0040] At present, the existing slurry trolley 1 is only used as a carrier of slurry, the slurry after mixing is sent into the slurry trolley 1, then the slurry trolley 1 is moved to the position close to the pole piece coating position, and finally the slurry in the slurry trolley 1 is sent into the coating system. In order to control the quality of the slurry, the application is provided with a weighing unit, a volume detection unit, and a first data processing unit 5. After the slurry is injected into the tank body 2 from the feed port 21, the weight of the slurry in the tank body 2 can be weighed by the weighing unit, and then the weight of the slurry in the tank body 2 is detected by the volume detection unit. After detecting the weight and volume of the slurry, the density of the slurry at this time can be obtained through the slurry weight / solid volume, and the change of the density of the slurry can be seen to see whether the solid content of the slurry changes. Then according to this data, the subsequent coating process control can be easily controlled, and the consistency of the pole piece coating is ensured.

[0041] It should be noted that the tank body 2 is movably arranged on the slurry trolley 1 in the vertical direction, the weighing unit is a gravity sensor 31, and is arranged on the outer bottom of the tank body 2. The weight of the entire tank body 2 is detected in real time by the gravity sensor 31, and then the weight of the slurry in the tank body 2 can be calculated according to the weight of the tank body 2 itself.

[0042] Since the weight of the tank body 2 is detected by the gravity sensor, the tank body 2 needs to be movably installed on the slurry trolley 1, in order to ensure the stability of the tank body 2, an installation frame 6 is also provided, and the slurry trolley 1 is movably arranged on the installation frame 6 in the vertical direction. Specifically, the installation frame 6 has a vertical guide rod, and the tank body 2 has a fixed block arranged on the outer side wall, the guide rod passes through the fixed block and is arranged so that the tank body can move up and down on the guide rod. The guide rod has a plurality of guide rods and is distributed around the tank body 2, thereby balancing and fixing the tank body 2. In this way, the weight of the entire tank body 2 can be detected by the gravity sensor. Alternatively, a vertical slide rail is arranged on the installation frame 6, and the tank body 2 is slidably arranged on the slide rail, as long as the tank body 2 can be movably arranged.

[0043] It should be noted that the bottom of the slurry trolley 1 has a plurality of rollers, and the rollers are self-locking rollers. In order to improve the contact area between the slurry trolley 1 and the ground, the bottom of the slurry trolley 1 is also provided with an extendable positioning block. When the slurry trolley 1 moves to a specified position, the positioning block is adjusted to be grounded, thereby preventing the slurry trolley from moving, and thus ensuring the accuracy of the weighing of the tank body 2 by the weighing unit.

[0044] It should be noted that the volume detection unit comprises a liquid level sensor 41 arranged in the tank body 2 for detecting the liquid level of the slurry in the tank body 2 in real time, and a second data processing unit 42 for calculating the volume of the slurry in the tank body 2 according to the data signal detected by the liquid level sensor 41. Further, the first data processing unit 5 obtains the real-time density of the slurry by algorithm through the transmitted real-time weight and slurry volume.

[0045] Since the bottom area of the tank body 2 is known, the volume of the slurry can be measured by detecting the liquid level of the slurry in the tank body 2. Therefore, a liquid level sensor 41 is arranged in the tank body 2. Specifically, for convenience of installation, an ultrasonic liquid level meter can be used. The ultrasonic liquid level meter emits ultrasonic signals, and the signals are reflected back when encountering the liquid surface. The height of the liquid level can be calculated by measuring the round-trip time of the ultrasonic signals.

[0046] Embodiment Two:

[0047] This embodiment is a further improvement based on Embodiment One.

[0048] As shown in Figs. 1-3 In this embodiment, a stirrer 7 is further arranged in the tank body 2 for stirring the slurry in the tank body 2.

[0049] After a long time, the slurry in the tank body 2 is prone to stagnant settlement, resulting in stratification, and thus the slurry discharged from the discharge port 22 of the tank body 2 is either dilute slurry or thick slurry. At this time, the density of the slurry in the tank body 2 will change significantly. If dilute slurry is discharged, the density of the remaining slurry will increase; if thick slurry is discharged, the density of the remaining slurry will decrease. Therefore, the stirrer 7 is arranged to be started at intervals to prevent settlement.

[0050] In this embodiment, the optimization further comprises a first control unit 8 electrically connected with the first data processing unit 5 and the stirrer 7, which controls the operating state of the stirrer 7 according to the density value of the slurry calculated by the first data processing unit 5.

[0051] In order to accurately control the operating state of the stirrer 7, the first control unit 8 is arranged to control whether the stirrer 7 operates by combining the calculated slurry density of the first data processing unit 5, thereby saving electric energy.

[0052] Embodiment Three:

[0053] This embodiment is a further improvement based on any of the above embodiments.

[0054] As shown in Fig. 2As shown in the embodiment, the feeding pipe 211 is arranged on the feeding port 21, and one end of the feeding pipe 211 is arranged close to the inner bottom of the tank body 2.

[0055] In order to continuously feed the slurry from the discharge port 22 of the slurry trolley 1, the feeding port 21 of the tank body 2 needs to continuously flow into the slurry. In order to avoid the large amplitude in the process of flowing the slurry from the feeding port 21 into the tank body 2, which causes a large error in the weight detected by the gravity sensor, the feeding pipe 211 is arranged, and the feeding pipe 211 is arranged to extend into the tank body 2 and is arranged above the bottom of the tank body 2 to a certain height, so as to reduce the oscillation.

[0056] Embodiment four:

[0057] The embodiment is further improved on the basis of any of the above embodiments.

[0058] As shown in the embodiment, Fig. 2 and Fig. 3 In the embodiment, the coating pump 9 is further arranged, and the coating pump 9 is connected with the discharge port 22 of the tank body 2 and is used for pumping the slurry in the tank body 2 to the coating surface of the pole piece. By arranging the coating pump 9, the slurry can be conveniently sprayed to the pole piece.

[0059] In the embodiment, the second control unit 10 is further arranged, and the second control unit 10 is electrically connected with the first data processing unit 5 and the coating pump 9, and the speed of the coating pump 9 is controlled according to the density value of the slurry calculated by the first data processing unit 5. By detecting the density of the slurry in the tank body 2, the actual situation of the solid content of the slurry can be known, and then the data can be used to control the pumping speed of the coating pump 9, so as to guarantee the areal density consistency of the subsequent pole piece coating.

[0060] It should be noted that, in the case that the solid content of the slurry is unchanged, the greater the pumping speed of the coating pump 9, the thicker the slurry coated on the pole piece, and the greater the areal density after drying; on the contrary, the smaller the pumping speed of the coating pump 9, the thinner the slurry coated on the pole piece, and the smaller the areal density after drying. Therefore, when the density of the slurry calculated by the first data processing unit 5 is higher than the maximum preset threshold value, the second control unit 10 controls the speed of the coating pump 9 to decrease; when the density of the slurry calculated by the first data processing unit 5 is lower than the maximum preset threshold value, the second control unit 10 controls the speed of the coating pump 9 to increase.

[0061] Embodiment five:

[0062] The embodiment provides a pole piece coating system, and the slurry feeding device in any of the above embodiments is used to coat the slurry to the pole piece.

[0063] By adopting the above scheme, the slurry solid content fluctuation in the coating process can be effectively detected, so that the main operator can timely adjust, thereby avoiding the situation that the coating surface density fluctuation leads to shutdown, the coating surface density failure rate can be reduced, the coating pole piece surface density CPK and consistency can be improved, and the quality and consistency of the battery product can be improved.

[0064] The above has described various embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications, or improvements to the technology in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A slurry feeding device, characterized in that, include: The slurry trolley (1) has a tank (2) for storing slurry, and the tank (2) is provided with an inlet (21) and an outlet (22). A weighing unit is used to measure the weight of the slurry inside the tank (2); A volume detection unit is used to measure the volume of the slurry inside the tank (2); And the first data processing unit (5) calculates the density of the slurry in the tank (2) based on the data signals detected by the weighing unit and the volume detection unit.

2. The slurry feeding device as described in claim 1, characterized in that, The tank (2) is movably mounted on the slurry trolley (1) in a vertical direction, and the weighing unit is a gravity sensor (31) and is located at the bottom of the tank (2).

3. The slurry feeding device as described in claim 2, characterized in that, The slurry trolley (1) is provided with a mounting frame (6), and the slurry trolley (1) is mounted on the mounting frame (6) in a vertical direction.

4. The slurry feeding device as described in claim 1, characterized in that, The volume detection unit includes: A liquid level sensor (41) is installed inside the tank (2) to detect the liquid level height of the slurry inside the tank (2); And the second data processing unit (42) calculates the volume of slurry in the tank (2) based on the data signal detected by the liquid level sensor (41).

5. The slurry feeding device as described in claim 1, characterized in that, Also includes: A stirrer (7) is installed inside the tank (2) for stirring the slurry inside the tank (2).

6. The slurry feeding device as described in claim 5, characterized in that, Also includes: The first control unit (8) is electrically connected to the first data processing unit (5) and the agitator (7), and controls the operating state of the agitator (7) according to the density value of the slurry calculated by the first data processing unit (5).

7. The slurry feeding device as described in claim 1, characterized in that, The feed inlet (21) is provided with a feed pipe (211), and one end of the feed pipe (211) is located inside the tank (2) near the bottom of the tank (2).

8. The slurry feeding device as described in claim 1, characterized in that, Also includes: A coating pump (9) is connected to the outlet (22) of the tank (2) and is used to pump the slurry in the tank (2) to the coating surface of the electrode.

9. The slurry feeding device as described in claim 8, characterized in that, Also includes: The second control unit (10) is electrically connected to the first data processing unit (5) and the coating pump (9), and controls the speed of the coating pump (9) according to the density value of the slurry calculated by the first data processing unit (5).

10. An electrode coating system, characterized in that, The slurry is coated onto the electrode using the slurry feeding device as described in any one of claims 1-9.

Images