Battery closed-loop coating system

Abstract

The utility model relates to a battery closed-loop coating system, and relates to the technical field of battery production, the battery closed-loop coating system comprises an unwinding device and a winding device, and an upper surface coating device, a first drying device, a lower surface coating device and a second drying device are sequentially arranged between the unwinding device and the winding device along the conveying direction of an electrode plate; a first detection device is arranged between the unwinding device and the upper surface coating device, a second detection device is arranged between the first drying device and the lower surface coating device, and a third detection device is arranged between the second drying device and the winding device; the upper surface coating device and the lower surface coating device are each provided with an adjusting module used for adjusting the discharging amount of slurry. The signal output ends of the first detection device, the second detection device and the third detection device are in signal connection with a controller, and the signal input end of the controller is in signal connection with the signal input end of the adjusting module. The accuracy of slurry flow control can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery production technology, in particular to a battery closed-loop coating system. BACKGROUND

[0002] The cell of a lithium battery includes a pole piece, the pole piece is coated with slurry, the pole piece is divided into a positive pole piece and a negative pole piece, the positive pole piece is coated with a positive pole slurry, and the negative pole piece is coated with a negative pole slurry. In the process of producing a lithium battery, after the slurry is prepared, a coating machine is used to coat the slurry on the pole piece.

[0003] In the prior art, the pole piece of a lithium ion battery is mainly coated by using a slit coating. Specifically, slurry with qualified viscosity and solid content is uniformly coated on the positive and negative current collectors. The traditional coating equipment changes the gap below the T-shaped adjusting block by moving the T-shaped adjusting block up and down through manual or servo motor control, thereby changing the slurry flow through the gap to achieve the effect of adjusting the area density of the pole piece.

[0004] However, the way of adjusting the slurry flow by manually controlling the servo motor to adjust the T-shaped adjusting block has low accuracy, which is difficult to guarantee the product quality control, and there is room for improvement. CONTENT OF THE UTILITY MODEL

[0005] In order to improve the accuracy of slurry flow control and provide protection for the product quality control of manufacturers, the present application provides a battery closed-loop coating system.

[0006] The battery closed-loop coating system provided by the present application adopts the following technical scheme:

[0007] A battery closed-loop coating system, comprising an unwinding device and a winding device, an upper surface coating device, a first drying device, a lower surface coating device, and a second drying device are sequentially arranged between the unwinding device and the winding device along the conveying direction of the electrode piece.

[0008] A first detection device is arranged between the unwinding device and the upper surface coating device, a second detection device is arranged between the first drying device and the lower surface coating device, and a third detection device is arranged between the second drying device and the winding device.

[0009] The upper surface coating device and the lower surface coating device are respectively provided with an adjusting module for adjusting the discharge amount of the slurry.

[0010] The signal output ends of the first detection device, the second detection device, and the third detection device are signal connected with a controller, and the signal input end of the controller is signal connected with the signal input end of the adjusting module.

[0011] By adopting the above technical scheme, in the actual production process, the lithium battery pole piece is continuously conveyed through the unwinding device and the winding device to pass through the upper surface coating device, the first drying device, the lower surface coating device and the second drying device; the upper surface coating device and the lower surface coating device respectively coat the upper surface and the lower surface of the lithium battery pole piece with slurry, and the first drying device and the second drying device can dry the slurry coated on the upper surface and the lower surface of the lithium battery pole piece. Among them, the first detection device detects the surface of the lithium battery pole piece without coating, the second detection device detects the surface of the slurry on the upper surface of the lithium battery pole piece after drying, and the third detection device detects the surface of the slurry on the lower surface of the lithium battery pole piece after drying. After comparison by the controller, the thickness and uniformity of the slurry on the surface of the lithium battery pole piece can be calculated according to the data measured by the first detection device, the second detection device and the third detection device, and the slurry flow of the upper surface coating device and the lower surface coating device can be adjusted according to the calculation result. Adjust the adjustment module of the upper surface coating device and the lower surface coating device to realize the technical effect of automatically adjusting the slurry coating thickness and density of the surface of the lithium battery pole piece. Compared with the manual control method, it is more accurate and convenient.

[0012] Preferably, the upper surface coating device and the lower surface coating device each include a power pump, a slurry tank and a feeding pipeline, the adjustment module includes a coating gap valve, and the power pump and the coating gap valve are arranged on the feeding pipeline;

[0013] The signal input ends of the power pump and the coating gap valve are signal connected with the signal output end of the controller, the feeding end of the feeding pipeline is in communication with the slurry tank, and the discharge ends of the feeding pipeline are each connected with a discharge die head for extruding slurry, and the discharge die head is provided with a lip opening for slurry outflow.

[0014] The discharge die head is provided with a containing cavity for placing slurry, the lip opening and the discharge end of the feeding pipeline are in communication with the containing cavity, and the inner diameter of the containing cavity is greater than the inner diameter of the discharge end of the feeding pipeline.

[0015] By adopting the above technical scheme, in the actual production process, the flow and pressure of the slurry in the feeding pipeline can be controlled by the coating gap valve to realize the technical effect of adjusting the amount of slurry sent through the die head; the power pump can convey the slurry in the slurry tank to the containing cavity through the feeding pipeline, and the slurry in the containing cavity flows out through the lip opening and is coated on the surface of the lithium battery pole piece to realize the technical effect of coating slurry.

[0016] Preferably, the upper surface coating device and the lower surface coating device further include a return pipeline, an electric valve and a check valve, the return pipeline is provided with a plurality of return pipelines, and the plurality of return pipelines are uniformly arranged along the width direction of the electrode piece.

[0017] The feeding end of the return pipeline is formed with a return port, the return port is communicated with the lip, the discharging end of the return pipeline is communicated with the feeding pipeline, the electric valve and the check valve are installed on the return pipeline, and the signal input end of the electric valve is signal connected with the signal output end of the controller.

[0018] By adopting the above technical scheme, in the actual slurry coating process, the excess slurry in the containing cavity can be returned to the feeding pipeline through the return pipeline, so as to prevent the slurry from overflowing, the electric valve can control the opening and closing of the return pipeline, and the check valve can prevent the slurry in the feeding pipeline from returning to the return pipeline.

[0019] Preferably, the power pump is a screw pump.

[0020] By adopting the above technical scheme, the screw pump can ensure that the slurry supply pressure is constant during coating.

[0021] Preferably, the first detection device, the second detection device and the third detection device are all X-ray-based surface density detection devices.

[0022] By adopting the above technical scheme, the X-ray-based surface density detection device can scan and detect the surface of the lithium battery pole piece through X-rays, thereby achieving the technical effects of automatically detecting the surface, upper surface slurry and lower surface slurry of the lithium battery pole piece.

[0023] Preferably, the first detection device, the second detection device and the third detection device each include a mounting seat, an X-ray detector is fixedly installed on the mounting seat, the sensing end of the X-ray detector is arranged towards the surface of the battery pole piece, and the three X-ray detectors detect the intensity of the X-rays reflected by the surface of the pole piece and output ray intensity signals respectively.

[0024] The signal output ends of the three X-ray detectors are signal connected with a single-chip microcomputer, the single-chip microcomputer receives the ray intensity signals and outputs an alarm signal when any ray intensity is less than a set value.

[0025] The signal output end of the single-chip microcomputer is signal connected with a buzzer, and the buzzer receives the alarm signal and emits an alarm sound.

[0026] Three indicator lights are installed on the three mounting seats respectively, and the signal input ends of the three indicator lights are signal connected with the signal output end of the single-chip microcomputer.

[0027] By adopting the above technical scheme, in the process of real-time detection of the first detection device, the second detection device and the third detection device, the X-rays emitted by the first detection device, the second detection device and the third detection device are reflected via the surface of the battery pole piece, are received by the three X-ray detectors, the three X-ray detectors detect the intensity of the X-rays reflected by the surface of the battery pole piece and respectively output the ray intensity signals, the single-chip microcomputer respectively compares after receiving the ray intensity signals, when the X-rays measured by any one X-ray detector is less than the set value, the single-chip microcomputer controls the buzzer to emit an alarm sound, and controls the corresponding prompt lamp to emit light at the same time, prompting the on-site operator that the first detection device, the second detection device or the third detection device is abnormally running, so that the operator can timely maintain and repair the first detection device, the second detection device or the third detection device.

[0028] In summary, the battery closed-loop coating system has at least one of the following beneficial technical effects:

[0029] 1. By closed-loop control of the upper surface coating device, the lower surface coating device, the first detection device, the second detection device and the third detection device, the degree of automation can be improved, the surface density of the battery pole piece can be automatically adjusted, the surface density automatic closed-loop control can be realized, the problem of material leakage of the traditional closed-loop coating equipment can be solved, the labor intensity of the operator can be reduced, and the dependence on manual operation experience can be reduced.

[0030] 2. In the actual slurry coating process, the excess slurry in the containing cavity can flow back to the feeding pipeline through the backflow pipeline, so as to prevent the slurry from overflowing, the opening and closing of the backflow pipeline can be controlled through the electric valve, and the slurry in the feeding pipeline can be prevented from flowing back to the backflow pipeline through the check valve. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram for showing the overall structure of the coating system.

[0032] Figure 2 is a schematic diagram for showing the installation position of the upper surface coating device.

[0033] Figure 3 is a schematic diagram for showing the overall structure of the die.

[0034] Figure 4 is a schematic diagram for showing the internal structure of the die.

[0035] Figure 5 is a schematic diagram for showing the installation position of the X-ray detector.

[0036] Explanation of reference signs: 1, upper surface coating device; 2, first drying device; 3, first detection device; 4, controller; 5, unwinding device; 6, winding device; 7, backflow pipeline; 9, check valve; 10, feeding pipeline; 11, power pump; 12, coating gap valve; 13, containing cavity; 14, backflow port; 15, lower surface coating device; 16, second drying device; 17, second detection device; 18, third detection device; 19 mounting seat; 20, X-ray detector; 21, prompt lamp. DETAILED DESCRIPTION

[0037] The following will be described in detail in combination with the accompanying drawings. Figures 1-5 The application is further described in detail.

[0038] Example 1

[0039] The embodiment of the application discloses a battery closed-loop coating system. Figures 1-4 , comprising an unwinding device 5 and a winding device 6, and the unwinding device 5 and the winding device 6 are sequentially provided with an upper surface coating device 1, a first drying device 2, a lower surface coating device 15 and a second drying device 16 along the conveying direction of the electrode sheet.

[0040] The first detection device 3 is arranged between the unwinding device 5 and the upper surface coating device 1, the second detection device 17 is arranged between the first drying device 2 and the lower surface coating device 15, and the third detection device 18 is arranged between the second drying device 16 and the winding device 6.

[0041] The upper surface coating device 1 and the lower surface coating device 15 are respectively provided with an adjusting module for adjusting the discharge amount of the slurry.

[0042] The signal output ends of the first detection device 3, the second detection device 17 and the third detection device 18 are signal connected with a controller 4, and the signal input end of the controller 4 is signal connected with the signal input end of the adjusting module.

[0043] In the actual production process, the lithium battery electrode sheet is continuously conveyed through the unwinding device 5, the winding device 6, the upper surface coating device 1, the first drying device 2, the lower surface coating device 15 and the second drying device 16; the upper surface coating device 1 and the lower surface coating device 15 coat the upper surface and the lower surface of the lithium battery electrode sheet with slurry respectively, and the first drying device 2 and the second drying device 16 can dry the slurry coated on the upper surface and the lower surface of the lithium battery electrode sheet.

[0044] The first detection device 3 detects the surface density of the lithium battery pole piece before coating and is calibrated as the first surface density, the second detection device 17 detects the surface density of the upper surface of the lithium battery pole piece after coating and is calibrated as the second surface density, and the third detection device 18 detects the surface density of the lower surface of the lithium battery pole piece after coating and is calibrated as the third surface density.

[0045] When the lithium battery pole piece passes through the first detection device 3, the first detection device 3 detects the surface density of the lithium battery pole piece before coating and is calibrated as the first surface density, the second detection device 17 detects the surface density of the upper surface of the lithium battery pole piece after coating and is calibrated as the second surface density, and the third detection device 18 detects the surface density of the lower surface of the lithium battery pole piece after coating and is calibrated as the third surface density.

[0046] The controller 4 compares the second surface density, the third surface density and the first surface density to obtain the coating value of the upper surface of the slurry and is calibrated as the first coating value, and obtains the coating value of the lower surface of the slurry and is calibrated as the second coating value. The first coating value and the second coating value are analyzed and compared to determine the coating thickness and uniformity of the slurry on the upper surface and the lower surface of the lithium battery pole piece. If the first coating value and / or the second coating value deviates from the normal range, the controller 4 can control the adjusting device to adjust the discharge amount of the slurry.

[0047] Through the closed-loop control of the upper surface coating device 1, the lower surface coating device 15, the first detection device 3, the second detection device 17 and the third detection device 18, the degree of automation can be improved, the surface density of the battery pole piece can be automatically adjusted, the surface density automatic closed-loop control can be realized, the problem of material leakage of the traditional closed-loop coating equipment can be solved, the labor intensity of the operator can be reduced, and the dependence on manual operation experience can be reduced.

[0048] Referring to Figure 3 With Figure 4The upper surface coating device 1 and the lower surface coating device 15 each include a power pump 11, a slurry tank and a feeding pipeline 10, and the adjusting module includes a coating gap valve 12, and the power pump 11 and the coating gap valve 12 are arranged on the feeding pipeline 10; the signal input ends of the power pump 11 and the coating gap valve 12 are signal connected with the signal output end of the controller 4, the feeding end of the feeding pipeline 10 is communicated with the slurry tank, and the discharging ends of the feeding pipeline 10 are each connected with a discharging die head for extruding slurry, and the discharging die head is provided with a lip opening for slurry to flow out.

[0049] The discharging die head is provided with a containing cavity 13 for placing slurry, and the lip opening and the discharging end of the feeding pipeline 10 are communicated with the containing cavity 13, and the inner diameter of the containing cavity 13 is greater than the inner diameter of the discharging end of the feeding pipeline 10.

[0050] In the actual production process, the flow and pressure of the slurry in the feeding pipeline 10 can be controlled through the coating gap valve 12, so as to realize the technical effect of adjusting the amount of slurry sent through the die head; the power pump 11 can convey the slurry in the slurry tank to the containing cavity 13 through the feeding pipeline 10, and the slurry in the containing cavity 13 flows out through the lip opening and is coated on the surface of the lithium battery pole piece, so as to realize the technical effect of coating slurry.

[0051] Referring to Figure 3 With Figure 4 The upper surface coating device 1 and the lower surface coating device 15 further include a plurality of backflow pipelines 7, an electric valve and a check valve 9, the plurality of backflow pipelines 7 are uniformly arranged along the width direction of the electrode piece.

[0052] The feeding end of the backflow pipeline 7 is formed with a backflow opening 14, the backflow opening 14 is communicated with the lip opening, the discharging end of the backflow pipeline 7 is communicated with the feeding pipeline 10, the electric valve and the check valve 9 are installed on the backflow pipeline 7, and the signal input end of the electric valve is signal connected with the signal output end of the controller 4.

[0053] In the actual slurry coating process, the excess slurry in the containing cavity 13 can flow back to the feeding pipeline 10 through the backflow pipeline 7, so as to prevent the slurry from overflowing, the electric valve can be used to control the opening and closing of the backflow pipeline 7, and the check valve 9 can be used to prevent the slurry in the feeding pipeline 10 from flowing back to the backflow pipeline 7.

[0054] Referring to Figure 3 In the embodiment, the number of the backflow pipelines 7 is 15, the interval distance between adjacent backflow pipelines 7 is 40 mm, and the interval distance between the feeding end of the backflow pipeline 7 and the lip opening is not less than 35 mm, so as to avoid turbulence when the slurry flows back, so as to affect the surface slurry density of the lithium battery pole piece.

[0055] It needs to be explained that in the embodiment of the present application, the power pump 11 adopts a screw pump. The screw pump can guarantee constant slurry supply pressure during coating.

[0056] In addition, the first detection device 3, the second detection device 17 and the third detection device 18 all adopt X-ray-based surface density detection devices.

[0057] The X-ray-based surface density detection device can realize the technical effect of automatically detecting the surface of the lithium battery pole piece, the upper surface slurry and the lower surface slurry by scanning and detecting the surface of the lithium battery pole piece through X-rays.

[0058] The implementation principle of the battery closed-loop coating system in the embodiment of the present application is as follows: in the actual production process, the lithium battery pole piece is continuously conveyed through the upper surface coating device 1, the first drying device 2, the lower surface coating device 15 and the second drying device 16 via the unwinding device 5 and the winding device 6; the upper surface coating device 1 and the lower surface coating device 15 coat the upper surface and the lower surface of the lithium battery pole piece with slurry, and the first drying device 2 and the second drying device 16 dry the slurry coated on the upper surface and the lower surface of the lithium battery pole piece. The first detection device 3 detects the surface of the lithium battery pole piece without coating, the second detection device 17 detects the surface of the slurry on the upper surface of the lithium battery pole piece after drying, and the third detection device 18 detects the surface of the slurry on the lower surface of the lithium battery pole piece after drying. After comparison by the controller 4, the thickness and uniformity of the slurry on the surface of the lithium battery pole piece are calculated according to the data measured by the first detection device 3, the second detection device 17 and the third detection device 18, and the slurry flow of the upper surface coating device 1 and the lower surface coating device 15 is adjusted according to the calculation results to adjust the thickness and density of the slurry coating on the surface of the lithium battery pole piece, thereby realizing the technical effect of automatically adjusting the thickness and density of the slurry coating on the surface of the lithium battery pole piece, which is more accurate and convenient than the manual adjustment method.

[0059] Embodiment 2

[0060] In the embodiment of the present application, the first detection device 3, the second detection device 17 and the third detection device 18 all include a mounting seat 19 mounted on the rack of the coating device. Referring to Figure 5 , the mounting seat is fixedly installed with an X-ray detector 20, and the sensing end of the X-ray detector 20 is arranged towards the surface of the battery pole piece. The three X-ray detectors 20 detect the intensity of the X-rays reflected by the pole piece surface and respectively output the ray intensity signals.

[0061] The signal output ends of the three X-ray detectors 20 are connected with a single-chip microcomputer, which receives the ray intensity signals and outputs an alarm signal when any ray intensity is less than a set value; the signal output end of the single-chip microcomputer is connected with a buzzer, which receives the alarm signal and emits an alarm sound; the three mounting seats are respectively provided with indicator lights 21, and the signal input ends of the three indicator lights 21 are connected with the signal output end of the single-chip microcomputer.

[0062] In the process of real-time detection by the first detection device, the second detection device and the third detection device, the X-rays emitted by the first detection device, the second detection device and the third detection device are reflected via the surface of the battery pole piece and are received by the three X-ray detectors, which detect the intensity of the X-rays reflected by the surface of the battery pole piece and output ray intensity signals respectively; the single-chip microcomputer receives the ray intensity signals and compares them respectively; when the X-rays measured by any one X-ray detector are less than a set value, the single-chip microcomputer controls the buzzer to emit an alarm sound and controls the corresponding indicator light to emit light at the same time, thereby prompting the on-site operator that the first detection device, the second detection device or the third detection device is abnormal, so that the operator can timely repair and maintain the first detection device, the second detection device or the third detection device.

[0063] It should be noted that, in the embodiments of the present application, the X-ray detector uses a sensor with the model of xPIN, which is prior art and will not be described here.

[0064] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A battery closed loop coating system characterized by, It comprises a unwinding device (5) and a winding device (6), the unwinding device (5) and the winding device (6) are sequentially provided with an upper surface coating device (1), a first drying device (2), a lower surface coating device (15) and a second drying device (16) along the conveying direction of the electrode sheet. The first detection device (3) is arranged between the unwinding device (5) and the upper surface coating device (1), the second detection device (17) is arranged between the first drying device (2) and the lower surface coating device (15), and the third detection device (18) is arranged between the second drying device (16) and the winding device (6). The upper surface coating device (1) and the lower surface coating device (15) are respectively provided with an adjusting module for adjusting the discharge amount of the slurry. The signal output end of the first detection device (3), the second detection device (17) and the third detection device (18) is signal connected with a controller (4), and the signal input end of the controller (4) is signal connected with the signal input end of the adjusting module.

2. A battery closed loop coating system as claimed in claim 1, wherein, The upper surface coating device (1) and the lower surface coating device (15) each comprise a power pump (11), a slurry tank and a feeding pipeline (10), the adjusting module comprises a coating gap valve (12), and the power pump (11) and the coating gap valve (12) are arranged on the feeding pipeline (10). The signal input end of the power pump (11) and the coating gap valve (12) is signal connected with the signal output end of the controller (4), the feeding end of the feeding pipeline (10) is communicated with the slurry tank, the discharge end of the feeding pipeline (10) is respectively connected with a discharge die head for extruding the slurry, and the discharge die head is provided with a lip for slurry outflow. A containing cavity (13) for placing the slurry is arranged in the die head, the lip, the discharge end of the feeding pipeline (10) and the containing cavity (13) are communicated, and the inner diameter of the containing cavity (13) is greater than the inner diameter of the discharge end of the feeding pipeline (10).

3. A battery closed loop coating system as claimed in claim 2, wherein, The upper surface coating device (1) and the lower surface coating device (15) further comprise a backflow pipeline (7), an electric valve and a check valve (9), the backflow pipeline (7) is provided with a plurality of backflow pipelines (7), and the plurality of backflow pipelines (7) are uniformly arranged along the width direction of the electrode sheet. The feeding end of the backflow pipeline (7) is formed with a backflow port (14), the backflow port (14) is communicated with the lip, the discharge end of the backflow pipeline (7) is communicated with the feeding pipeline (10), the electric valve and the check valve (9) are installed on the backflow pipeline (7), and the signal input end of the electric valve is signal connected with the signal output end of the controller (4).

4. The battery closed loop coating system of claim 3, wherein, The power pump (11) is a screw pump.

5. The battery closed loop coating system of claim 1, wherein, The first detection device (3), the second detection device (17) and the third detection device (18) are all X-ray-based surface density detection devices.

6. A battery closed loop coating system as claimed in claim 5, wherein, The first detection device (3), the second detection device (17) and the third detection device (18) each comprise a mounting seat (19), an X-ray detector (20) is fixedly installed on the mounting seat (19), and the sensing end of the X-ray detector (20) is arranged towards the surface of the battery pole piece; the three X-ray detectors (20) detect the intensity of the X-rays reflected via the pole piece surface and respectively output ray intensity signals; The signal output ends of the three X-ray detectors (20) are signal connected with a single-chip microcomputer, the single-chip microcomputer receives the ray intensity signals and outputs an alarm signal when any ray intensity is less than a set value; The signal output end of the single-chip microcomputer is signal connected with a buzzer, the buzzer receives the alarm signal and emits an alarm sound; Three indicating lamps (21) are respectively installed on the three mounting seats, and the signal input ends of the three indicating lamps (21) are signal connected with the signal output end of the single-chip microcomputer.

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