A lithium battery coating apparatus

Abstract

The utility model relates to the technical fields of coating equipment, and specifically disclose a kind of lithium battery coating equipment, including slurry container, slurry conveying pipeline, multiple on-line detectors, coating die, area density instrument, execution unit and control system, one end of slurry conveying pipeline is communicated with the outlet of slurry container, other end is communicated with the inlet of coating die, multiple on-line detectors are sequentially arranged along the conveying direction of slurry conveying pipeline, and be used for real-time detection multiple parameters of slurry in slurry conveying pipeline, area density instrument is used to detect the area density of pole piece formed after coating and drying, execution unit is arranged on slurry conveying pipeline, and be used for adjusting the parameter of slurry, control system is connected with multiple on-line detectors and area density instrument electric signal by data acquisition line, and is connected with execution unit and coating die electric signal by control line, realizes double closed-loop control adjustment, significantly improves pole piece coating quality and consistency, satisfies the demand of lithium battery manufacturing.

Description

Technical Field

[0001] This utility model relates to the technical field of coating equipment, and specifically to a lithium battery coating equipment. Background Technology

[0002] In the production and manufacturing process of lithium batteries, the quality of the slurry is a key factor determining the electrode coating effect and even the final battery product performance (such as capacity, cycle life, and safety). The key quality indicators of the slurry mainly include viscosity, solid content, flow rate, and temperature. Currently, the industry mainly uses the following two methods to control the quality of the slurry, but both have significant shortcomings:

[0003] 1. Offline testing mode is severely lagging and relies on manual experience: Currently, many battery manufacturers still mainly use offline testing to monitor slurry quality. The specific process is as follows: samples are manually taken from the slurry delivery pipeline or container and then sent to the laboratory for testing and analysis. After waiting for the test results, the operators adjust the process parameters of the slurry equipment based on their personal experience. This method has a serious time lag and a long quality feedback cycle. When the test results are abnormal, a large number of unqualified electrode sheets may have already been produced, resulting in huge material waste. At the same time, manual adjustment of parameters has low accuracy and poor consistency, making it difficult to ensure process stability and directly leading to fluctuations in battery performance.

[0004] 2. Online detection equipment operates in isolation and fails to form an effective closed loop: With technological advancements, some production lines have begun to use online detection equipment to monitor slurry in real time. However, these online detection devices often operate in isolation in application, and their detection data is not effectively integrated and used for real-time automatic control. They are usually only used for on-site display or simple alarms, and fail to form intelligent and rapid linkage control with the actuators. Utility Model Content

[0005] This utility model addresses the aforementioned problems and aims to provide a lithium battery coating device that can achieve closed-loop control in both the front and rear stages, thereby improving coating quality and consistency.

[0006] To achieve the above objectives, this utility model provides a lithium battery coating device, comprising:

[0007] Slurry container;

[0008] A slurry conveying pipeline, one end of which is connected to the outlet of the slurry container;

[0009] Multiple online detectors are arranged sequentially along the conveying direction of the slurry conveying pipeline and are used to detect multiple parameters of the slurry in the slurry conveying pipeline in real time.

[0010] A coating die head, wherein the inlet of the coating die head is connected to the end of the slurry delivery pipeline away from the slurry container;

[0011] A surface density meter, located downstream of the coating die, is used to detect the surface density of the electrode sheet;

[0012] At least one execution unit is arranged on the slurry delivery pipeline and is used to adjust the parameters of the slurry;

[0013] The control system is electrically connected to multiple online detectors and areal density meters via data acquisition lines, and electrically connected to the execution unit and coating die head via control lines.

[0014] According to the lithium battery coating equipment described above, the multiple online testing instruments include an online viscometer, an online solids meter, an online flow meter, and an online thermometer.

[0015] According to the lithium battery coating equipment described above, the execution unit includes a screw pump and a mold temperature controller. Both the screw pump and the mold temperature controller are arranged on the slurry conveying pipeline, and the mold temperature controller is located downstream of the screw pump. The control system is electrically connected to the screw pump and the mold temperature controller through two control lines respectively.

[0016] According to the lithium battery coating equipment described above, the online thermometer is arranged on the slurry conveying pipeline downstream of the mold temperature controller.

[0017] According to the lithium battery coating equipment described above, the online viscometer, online solids meter, and online flow meter are arranged between the online thermometer and the coating die or between the slurry container and the screw pump.

[0018] According to the lithium battery coating equipment described above, the execution unit further includes a gap valve, which is arranged on the slurry conveying pipeline between the mold temperature controller and the coating die head, and the control system is electrically connected to the gap valve through the control line.

[0019] According to the above-described lithium battery coating equipment, the gap valve has a first liquid outlet and a second liquid outlet. The first liquid outlet is connected to the coating die head through the slurry conveying pipeline, and the second liquid outlet is connected to the slurry container.

[0020] The lithium battery coating equipment described above further includes an unwinding unit located downstream of the coating die head. The unwinding unit includes an unwinding roller, a back roller, and a tension roller. A substrate is provided on the unwinding roller, and one end of the substrate is sequentially wound around the back roller and the tension roller. The back roller is located on one side of the coating die head outlet.

[0021] The lithium battery coating equipment described above further includes a winding unit and an oven. The winding unit includes a winding roller located downstream of the tension roller, and the oven is located between the tension roller and the winding roller.

[0022] According to the lithium battery coating equipment described above, the areal density meter is located between the oven and the take-up roller.

[0023] This utility model has the following beneficial effects:

[0024] 1. The slurry parameters can be tested and adjusted in the early stage by multiple online testing instruments, and the surface density of the electrode can be tested by a surface density meter after molding. If it does not meet the standard, it can be fed back to the control system and the preset parameters of the slurry and the position of the coating die head can be adjusted to achieve the effect of dual closed-loop control. This can maximize the consistency of surface density, reduce the capacity fluctuation of the battery in subsequent processes, and avoid the batch scrapping of batteries.

[0025] 2. Multiple online testing instruments, including online viscometer, online solids meter, online flow meter and online thermometer, can determine the overall state of the slurry from multiple parameters, achieving multi-parameter fusion, which can further improve the quality control of the slurry;

[0026] 3. The control system can achieve fully automatic control and adjustment of parameters without manual intervention, reducing the difficulty of operation and human error. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0028] In the picture:

[0029] 100. Slurry container;

[0030] 200. Slurry delivery pipeline;

[0031] 300. Online measuring instrument; 310. Online viscometer; 320. Online solids meter; 330. Online flow meter; 340. Online thermometer;

[0032] 400. Coating die head;

[0033] 500. Areal density meter;

[0034] 600. Actuation unit; 610. Screw pump; 620. Mold temperature controller; 630. Clearance valve;

[0035] 700, Unwinding unit; 710, Unwinding roll; 720, Back roll; 730, Tension roll;

[0036] 800. Take-up roller;

[0037] 900. Oven. Detailed Implementation

[0038] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0039] like Figure 1 As shown, a lithium battery coating equipment includes a slurry container 100, a slurry delivery pipeline 200, multiple online detectors 300, a coating die 400, a surface density meter 500, at least one execution unit 600, a control system, an unwinding unit 700, a winding unit, and an oven 900. In this embodiment, the slurry container 100 and the slurry delivery pipeline 200 supply slurry to the coating die 400, which then sprays slurry onto the substrate on the unwinding unit 700 to obtain a wet electrode sheet. The wet electrode sheet is then baked in the oven 900 to obtain a finished dry electrode sheet, which is then wound onto the winding unit. During this process, multiple online detectors 300... The system can detect multiple parameters of the slurry in the slurry delivery pipe and feed them back to the control system. The control system can control the execution unit 600 to adjust multiple parameters of the slurry and the position of the coating die head 400 to ensure the quality of the slurry and the coating. At the same time, after the electrode is formed, its surface density can be detected by the surface density meter 500 and the data can be fed back to the control system. If the consistency is good, there is no need to adjust the preset parameters of the slurry. If the consistency is poor, the control system can control the execution unit 600 to adjust the preset parameters of the slurry. This achieves a dual closed-loop control adjustment of the consistency between the slurry quality and the surface density of the finished electrode, which can greatly improve the quality of the finished electrode and avoid large-scale waste.

[0040] Specifically, the slurry container 100 is used to store pre-stirred battery positive or negative electrode slurry, and the slurry container 100 can be a storage cart, a storage tank, or a stirring tank.

[0041] Specifically, one end of the slurry conveying pipeline 200 is connected to the outlet of the slurry container 100, and the other end of the slurry conveying pipeline 200 is connected to the inlet of the coating die head 400. It is used to provide a preset path for the conveying of slurry, so that the slurry can be conveyed from the slurry container 100 to the coating die head 400.

[0042] Specifically, multiple online detectors 300 are sequentially arranged along the conveying direction of the slurry conveying pipeline 200 and are used to detect multiple parameters of the slurry in the slurry conveying pipeline 200 in real time. In this embodiment, the multiple online detectors 300 include an online viscometer 310, an online solids meter 320, an online flow meter 330, and an online thermometer 340. The online viscometer 310 is used to detect the viscosity of the slurry, the online solids meter 320 is used to detect the solids content in the slurry, the online flow meter 330 is used to detect the slurry flow rate in the slurry conveying pipeline 200, and the online thermometer 340 is used to detect the slurry temperature in the slurry conveying pipeline 200. After detection, all of them can be fed back to the control system, and the control system can determine the slurry parameters. Its main function is real-time detection and real-time feedback.

[0043] Among them, the accuracy requirement for the online viscometer 310 is ≤ ±1.5%, the accuracy requirement for the online flowmeter 330 is ≤ ±0.1%, and the accuracy requirement for the online solids meter 320 is ≤ 0.5%.

[0044] Specifically, the execution unit 600 is arranged on the slurry delivery pipeline 200 and is used to adjust the parameters of the slurry. In this embodiment, there are three execution units 600, each including a screw pump 610, a mold temperature controller 620, and a gap valve 630. The screw pump 610, mold temperature controller 620, and gap valve 630 are all arranged on the slurry delivery pipeline 200. The mold temperature controller 620 is located downstream of the screw pump 610, and the gap valve 630 is located downstream of the mold temperature controller 620. The screw pump 610 and the gap valve 630 are connected to the control system via independent control lines. The control system can independently control the screw pump 610, the mold temperature controller 620, and the gap valve 630. The screw pump 610 serves as the power source for slurry delivery, which can extract the slurry from the slurry container 100 and deliver it along the slurry delivery pipeline 200. The mold temperature controller 620 is used to regulate the temperature of the slurry, which can affect the viscosity and flowability of the slurry. The gap valve 630 is used to control the flow direction of the slurry to achieve continuous or intermittent coating.

[0045] The online thermometer 340 is arranged on the slurry conveying pipeline 200 downstream of the mold temperature controller 620 to accurately detect the temperature regulation effect. However, the positions of the online viscometer 310, online solids meter 320, and online flow meter 330 can vary. In this embodiment, the online viscometer 310, online solids meter 320, and online flow meter 330 are all located between the online thermometer 340 and the coating die head 400, specifically between the online thermometer 340 and the gap valve 630.

[0046] In another embodiment, the online viscometer 310, the online content meter, and the online flow meter 330 are located between the gap valve 630 and the coating die 400.

[0047] In another embodiment, an online viscometer 310, an online content meter, and an online flow meter 330 are located between the slurry container 100 and the screw pump 610.

[0048] Furthermore, the gap valve 630 is arranged on the slurry delivery pipeline 200 between the mold temperature controller 620 and the coating die head 400. The gap valve 630 has a first outlet and a second outlet. The first outlet is connected to the coating die head 400 through the slurry delivery pipeline 200, and the second outlet is connected to the slurry container 100. In the intermittent coating mode, the control system controls the gap valve 630 to operate, so that the slurry during non-coating time returns to the slurry container 100 through the second outlet, thereby reducing slurry waste.

[0049] Specifically, the inlet of the coating die 400 is connected to the end of the slurry delivery pipeline 200 away from the slurry container 100. The coating die 400 is used to perform the spraying action. It should be noted that in this embodiment, the position of the coating die 400 is adjustable. Its position can be adjusted by a horizontal motor and a vertical motor, which are controlled by a control system. Adjusting the position of the coating die 400 can spray different parts of the substrate to ensure that the surface density of each part of the electrode is consistent.

[0050] Specifically, the unwinding unit 700 is located downstream of the coating die head 400, and the unwinding unit 700 includes an unwinding roller 710, a back roller 720, and a tension roller 730. The unwinding roller 710 is provided with a substrate, and one end of the substrate is sequentially wound around the back roller 720 and the tension roller 730. The back roller 720 is located on one side of the exit of the coating die head 400. The substrate is wound on the unwinding roller 710. By rotating the unwinding roller 710, the substrate can be released. The back roller 720 and the tension roller 730 can ensure that the substrate is always in a straight state, which is convenient for coating at the back roller 720.

[0051] Specifically, the winding unit includes a winding roller 800, which is located downstream of the tension roller 730. An oven 900 is located between the tension roller 730 and the winding roller 800. After the substrate is coated, a wet electrode sheet can be obtained, which can be dried in the oven 900 to obtain a dry electrode sheet, and finally stored by the winding roller 800.

[0052] Specifically, the areal density meter 500 is located downstream of the coating die head 400 and is used to detect the areal density of the electrode sheet formed after coating and drying. That is, it is used to detect the formed electrode sheet. Therefore, in this embodiment, the areal density meter 500 is located between the oven 900 and the take-up roller 800. The areal density data of the electrode sheet detected by the meter can be fed back to the control system. The control system determines whether the data is qualified. If it is qualified, there is no need to adjust the preset parameters of the slurry. If it is not qualified, the preset parameters of the slurry are adjusted, and the execution unit 600 is controlled to adjust the parameters, thereby achieving control over the quality of the finished product.

[0053] Specifically, the control system is electrically connected to multiple online detectors 300 and areal density meters 500 via data acquisition lines, and electrically connected to screw pumps 610, mold temperature controllers 620, gap valves 630, and coating die heads 400 via control lines. The control system acquires multiple real-time data of the slurry through the data acquisition lines, and then connects to each execution unit 600 through the control lines. According to the preset algorithm, the execution units 600 are controlled to perform corresponding actions to achieve real-time parameter adjustment. After molding, the areal density of the electrode is detected by the areal density meter 500 and fed back to the control system. Then, it is judged whether it is qualified. If it is not qualified, the preset parameters of the slurry are adjusted in real time. Based on the regenerated parameters, the multiple execution units 600 are re-controlled to adjust the parameters, realizing dual closed-loop control adjustment. This significantly improves the coating quality and consistency of the electrode, meeting the needs of high-performance lithium battery manufacturing.

[0054] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] 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.

[0056] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A lithium battery coating equipment, characterized in that, include: Slurry container; A slurry conveying pipeline, one end of which is connected to the outlet of the slurry container; Multiple online detectors are arranged sequentially along the conveying direction of the slurry conveying pipeline and are used to detect multiple parameters of the slurry in the slurry conveying pipeline in real time. A coating die head, wherein the inlet of the coating die head is connected to the end of the slurry delivery pipeline away from the slurry container; A surface density meter, located downstream of the coating die, is used to detect the surface density of the electrode sheet; At least one execution unit is arranged on the slurry delivery pipeline for adjusting the parameters of the slurry; The control system is electrically connected to multiple online detectors and areal density meters via data acquisition lines, and is also electrically connected to the execution unit and the coating die head via control lines.

2. The lithium battery coating equipment according to claim 1, characterized in that, The aforementioned online testing instruments include online viscometers, online solids meters, online flow meters, and online thermometers.

3. The lithium battery coating equipment according to claim 2, characterized in that, The execution unit includes a screw pump and a mold temperature controller. Both the screw pump and the mold temperature controller are arranged on the slurry delivery pipeline, and the mold temperature controller is located downstream of the screw pump. The control system is electrically connected to the screw pump and the mold temperature controller through two control lines respectively.

4. The lithium battery coating equipment according to claim 3, characterized in that, The online thermometer is located on the slurry delivery pipeline downstream of the mold temperature controller.

5. The lithium battery coating equipment according to claim 4, characterized in that, The online viscometer, online solids meter, and online flow meter are arranged between the online thermometer and the coating die or between the slurry container and the screw pump.

6. The lithium battery coating equipment according to claim 3, characterized in that, The execution unit also includes a gap valve, which is arranged on the slurry delivery pipeline between the mold temperature controller and the coating die head. The control system is electrically connected to the gap valve through the control line.

7. A lithium battery coating equipment according to claim 6, characterized in that, The gap valve has a first liquid outlet and a second liquid outlet. The first liquid outlet is connected to the coating die head through the slurry conveying pipeline, and the second liquid outlet is connected to the slurry container.

8. The lithium battery coating equipment according to claim 1, characterized in that, It also includes an unwinding unit located downstream of the coating die head, and the unwinding unit includes an unwinding roller, a back roller and a tension roller. The unwinding roller is provided with a substrate, and one end of the substrate is sequentially wound around the back roller and the tension roller. The back roller is located on one side of the coating die head outlet.

9. A lithium battery coating equipment according to claim 8, characterized in that, It also includes a take-up unit and an oven, the take-up unit including a take-up roller located downstream of the tension roller, and the oven located between the tension roller and the take-up roller.

10. A lithium battery coating equipment according to claim 9, characterized in that, The areal density meter is located between the drying oven and the take-up roller.

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