Pole piece diaphragm thickness measuring device and winding machine

Abstract

The embodiment of the utility model provides a pole piece diaphragm thickness measuring device and a winding machine, and relates to the field of lithium ion battery production equipment. The problem that the thickness of a pole piece and the thickness of a diaphragm cannot be accurately measured in real time in the winding process is solved. The pole piece diaphragm thickness measuring device comprises a roller supporting seat, a fixed roller, a floating roller, a driving mechanism, a phase measuring mechanism and a displacement sensor. The driving mechanism is connected with the floating roller and is used for driving the floating roller to press the fixed roller; the phase measuring mechanism is used for detecting a first position on the floating roller and a second position on the fixed roller; the displacement sensor is used for measuring the floating displacement of the floating roller under the condition that the first position corresponds to the second position. The displacement sensor measures the floating displacement of the floating roller at the same phase position of the floating roller and the fixed roller each time through the phase measuring mechanism, and the thickness of a pole piece and the thickness of a diaphragm can be accurately measured in real time in the high-speed winding process of a battery cell.

Description

Technical Field

[0001] The utility model relates to the field of lithium ion battery production equipment, and in particular to a pole piece diaphragm thickness measuring device and a winding machine. Background Art

[0002] At present, in the production process of power batteries, it is difficult to accurately and stably control the thickness of the pole pieces and diaphragms, which leads to misalignment of the pole tabs during the production of the battery cells, and ultimately causes the subsequent battery cells to be unable to enter the shell. Utility Model Content

[0003] The purpose of the utility model includes, for example, providing a device for measuring the thickness of a pole piece and a diaphragm and a winding machine, which can improve the problem that the thickness of the pole piece and the diaphragm cannot be accurately measured in real time during the winding process of the battery cell.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] An embodiment of the utility model provides a device for measuring the thickness of a pole piece and a diaphragm, comprising a roller support seat, a fixed roller, a floating roller, a driving mechanism, a phase measuring mechanism and a displacement sensor, wherein the fixed roller is rotatably connected to the roller support seat; the driving mechanism is connected to the floating roller, and the driving mechanism is used to drive the floating roller to press against the fixed roller, so as to form a working gap for passing through the pole piece or the diaphragm between the floating roller and the fixed roller; the phase measuring mechanism is connected to at least one of the floating roller and the fixed roller, and the phase measuring mechanism is used to detect a first position on the circumferential surface of the floating roller and a second position on the circumferential surface of the fixed roller; the displacement sensor is connected to the floating roller, and the displacement sensor is used to measure the floating displacement of the floating roller each time the first position of the floating roller and the second position of the fixed roller correspond.

[0006] In addition, the electrode diaphragm thickness measuring device provided in the embodiment of the utility model may also have the following additional technical features:

[0007] Optionally, a first gear is fixed to at least one end of the fixed roller, and a second gear is fixed to at least one end of the floating roller; the first gear and the second gear are positioned correspondingly and meshed.

[0008] Optionally, the number of the displacement sensors is two; the two displacement sensors are respectively arranged at two ends of the floating roller, and the two displacement sensors are respectively used to detect the floating displacement at the two ends of the floating roller.

[0009] Optionally, the phase measurement mechanism is an encoder or a servo motor.

[0010] Optionally, the phase measurement mechanism is an encoder, and the encoder is fixed to the end of the fixed roller.

[0011] Optionally, there are two encoders; one encoder is fixed to each end of the floating roller and the other to the end of the fixed roller.

[0012] Optionally, the driving mechanism is a driving cylinder, a spring or a motor; the driving mechanism is connected between two ends of the floating roller.

[0013] Optionally, the pole piece diaphragm thickness measuring device also includes a fixed frame and a fixed plate; both ends of the floating roller are rotatably connected to the fixed frame; the fixed plate is fixed to the fixed frame, and the plane where the fixed plate is located is parallel to the center line of the floating roller, and the displacement sensor and the driving mechanism are fixed on the fixed plate.

[0014] Optionally, the pole piece diaphragm thickness measuring device further comprises a guide rail; the guide rail is fixed in a vertical direction; the floating roller is slidably connected to the guide rail; and the driving mechanism drives the floating roller along the guide rail to press against the fixed roller.

[0015] An embodiment of the utility model also provides a winding machine, which includes a winding device and a pole piece diaphragm thickness measuring device; the winding device is arranged downstream of the pole piece diaphragm thickness measuring device, and the winding device is used to wind the pole piece and diaphragm output from the pole piece diaphragm thickness measuring device.

[0016] The beneficial effects of the electrode diaphragm thickness measuring device and the winding machine of the embodiment of the utility model include, for example:

[0017] The device for measuring the thickness of a pole piece and a diaphragm comprises a roller support seat, a fixed roller, a floating roller, a driving mechanism, a phase measuring mechanism and a displacement sensor, wherein the fixed roller is rotatably connected to the roller support seat; the driving mechanism is connected to the floating roller, and is used to drive the floating roller to press against the fixed roller, so as to form a working gap between the floating roller and the fixed roller for passing through the pole piece or the diaphragm; the phase measuring mechanism is connected to at least one of the floating roller and the fixed roller, and is used to detect a first position on the circumferential surface of the floating roller and a second position on the circumferential surface of the fixed roller; the displacement sensor is connected to the floating roller, and is used to measure the floating displacement of the floating roller each time the first position of the floating roller and the second position of the fixed roller correspond.

[0018] The relative phase of the floating roller and the fixed roller is detected and determined by the phase measurement mechanism. The displacement sensor measures the floating displacement of the floating roller at the same phase position of the floating roller and the fixed roller each time, which improves the detection accuracy and can perform real-time and accurate measurement of the thickness of the pole piece and diaphragm during the high-speed winding of the battery cell.

[0019] The winding machine, including the above-mentioned electrode and diaphragm thickness measuring device, can improve the problem of being unable to perform real-time and accurate measurement of the electrode and diaphragm thickness during the battery cell winding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of the electrode diaphragm thickness measuring device provided in this embodiment from a main viewing angle;

[0022] Figure 2 A side view of the electrode diaphragm thickness measuring device provided in this embodiment.

[0023] Icon: 10-pole piece diaphragm thickness measuring device; 100-fixed roller; 110-first gear; 200-floating roller; 210-second gear; 300-driving mechanism; 310-working gap; 400-encoder; 500-displacement sensor; 600-fixed frame; 610-fixed plate; 700-pole piece. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0028] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0029] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0030] Combine the following Figure 1 to Figure 2 The pole piece diaphragm thickness measuring device 10 provided in this embodiment is described in detail.

[0031] Please refer to Figure 1 and Figure 2 The embodiment of the utility model provides a device 10 for measuring the thickness of a pole piece diaphragm, comprising a roller support seat, a fixed roller 100, a floating roller 200, a driving mechanism 300, a phase measuring mechanism and a displacement sensor 500, wherein the fixed roller 100 is rotatably connected to the roller support seat; the driving mechanism 300 is connected to the floating roller 200, and the driving mechanism 300 is used to drive the floating roller 200 to press against the fixed roller 100, so as to form a working gap 310 for passing through the pole piece 700 or the diaphragm between the floating roller 200 and the fixed roller 100; the phase measuring mechanism is connected to at least one of the floating roller 200 and the fixed roller 100, and the phase measuring mechanism is used to detect a first position on the circumferential surface of the floating roller 200 and a second position on the circumferential surface of the fixed roller 100; the displacement sensor 500 is connected to the floating roller 200, and the displacement sensor 500 is used to measure the floating displacement of the floating roller 200 when the first position of the floating roller 200 and the second position of the fixed roller 100 correspond each time.

[0032] The floating roller 200 has a first position on its circumferential surface, and the fixed roller 100 has a second position on its circumferential surface. During the rotation of the floating roller 200 and the fixed roller 100, floating displacement detection is performed each time when the first position corresponds to the second position, which can reduce errors caused by mechanism interference.

[0033] The fixed roller 100 is fixed on the roller support seat, and the fixed roller 100 can rotate relative to the roller support seat. The floating roller 200 is located vertically above the fixed roller 100. The floating roller 200 is pressed toward the fixed roller 100 under the drive of the driving mechanism 300. The working gap 310 between the floating roller 200 and the fixed roller 100 passes through the pole piece 700 or the diaphragm. The floating roller 200 and the fixed roller 100 are pressed against each other, and the change in the thickness of the pole piece 700 or the diaphragm is detected by detecting the change in the floating position of the floating roller 200. The highest point of the same cross section is detected by adding a high-precision displacement sensor 500 through the roller pressure method.

[0034] The phase measurement mechanism is used to record the phase of the floating roller 200 and / or the fixed roller 100. The relative positions of the floating roller 200 and the fixed roller 100 are consistent each time the displacement sensor 500 detects. The displacement sensor 500 performs detection at the same position each time to avoid interference with the detection caused by the jumping of the roller, etc., reduce the error of the mechanism itself, and improve the detection accuracy.

[0035] In the initial state, the pole piece 700 does not penetrate into the working gap 310, the driving mechanism 300 extends to press the floating roller 200 against the fixed roller 100, the displacement sensor 500 is set to zero, and the phase measurement mechanism is set to zero. Then the driving mechanism 300 retracts, lifts the floating roller 200, penetrates the pole piece 700 or the diaphragm, and the driving mechanism 300 extends to press the pole piece 700 or the diaphragm against the fixed roller 100. At this time, the data of the displacement sensor 500 and the encoder 400 are used as the reference data. The data of the displacement sensor 500 is stored once every rotation of the fixed roller 100. Each time the data of the displacement sensor 500 is stored, it needs to be compared with the reference data to determine the thickness change of the pole piece 700 or the diaphragm. The system finally adjusts the embossing process and the tab cutting process in real time according to the thickness change of the pole piece 700 and the diaphragm to improve the tab misalignment problem.

[0036] The relative phase of the floating roller 200 and the fixed roller 100 is detected and determined by the phase measurement mechanism, and the displacement sensor 500 measures the floating displacement of the floating roller 200 at the same phase position of the floating roller 200 and the fixed roller 100 each time, thereby improving the detection accuracy. It can perform real-time and accurate measurement of the thickness of the pole piece 700 and the diaphragm during the high-speed winding of the battery cell, provide input data for the adjustment of the pole ear cutting process and the embossing process, and ultimately improve the pole ear misalignment problem.

[0037] Reference Figure 1 and Figure 2 In this embodiment, the number of the displacement sensors 500 is two; the two displacement sensors 500 are respectively arranged at the two ends of the floating roller 200, and the two displacement sensors 500 are respectively used to detect the floating displacement of the two ends of the floating roller 200.

[0038] The two displacement sensors 500 are distributed at both ends of the floating roller 200, and can measure the floating displacement at both ends of the floating roller 200, and can obtain the highest point displacement as a subsequent reference value. The measurements of the two displacement sensors 500 are different, and the larger value is selected as the subsequent reference value to improve the measurement accuracy.

[0039] Reference Figure 1 and Figure 2 In this embodiment, the phase measuring mechanism is an encoder 400 or a servo motor. The phase recording and mechanism error elimination method of the roller is not limited to the fixed encoder 400, and the floating roller 200 and the fixed roller 100 can be equipped with an encoder 400 or a servo motor.

[0040] Reference Figure 1 and Figure 2 In this embodiment, the phase measurement mechanism is an encoder 400, and the encoder 400 is fixed to the end of the fixed roller 100. The error of the mechanism itself can be reduced through the measurement of the encoder 400, thereby improving the detection accuracy.

[0041] Reference Figure 1 and Figure 2 In this embodiment, there are two encoders 400; one encoder 400 is fixed to each end of the floating roller 200 and the fixed roller 100. The encoders 400 are fixed to both the floating roller 200 and the fixed roller 100, so that the phases of the floating roller 200 and the fixed roller 100 can be determined, the detection accuracy can be improved, and the mechanism error can be reduced.

[0042] Reference Figure 1 and Figure 2 In this embodiment, the driving mechanism 300 is a driving cylinder, a spring or a motor; the driving mechanism 300 is connected between the two ends of the floating roller 200.

[0043] The pressure drive of the floating roller 200 and the fixed roller 100 is not limited to the cylinder, but can also be a spring or a motor. In the case of a cylinder, the cylinder is connected to the floating roller 200, and the cylinder is extended and retracted to drive the floating roller 200 to approach or move away from the fixed roller 100. In the case of a spring, the floating roller 200 is close to the fixed roller 100 under the action of the spring. In the case of a motor, it is necessary to cooperate with a screw rod, a slider and a slide rail. The motor drives the screw rod to rotate, and the screw rod drives the slider to move along the slide rail, and the floating roller 200 is connected to the slider. The specific driving method can be selected according to the actual situation.

[0044] Reference Figure 1 and Figure 2In this embodiment, the electrode diaphragm thickness measuring device 10 also includes a fixed frame 600 and a fixed plate 610; both ends of the floating roller 200 are rotatably connected to the fixed frame 600; the fixed plate 610 is fixed to the fixed frame 600, and the plane where the fixed plate 610 is located is parallel to the center line of the floating roller 200, and the displacement sensor 500 and the driving mechanism 300 are fixed on the fixed plate 610.

[0045] The fixing plate 610 is arranged horizontally, the two displacement sensors 500 are fixed at both ends of the fixing plate 610, and the driving mechanism 300 is connected to the middle of the fixing plate 610. The fixing frame 600 is U-shaped.

[0046] Reference Figure 1 and Figure 2 In this embodiment, the electrode diaphragm thickness measuring device 10 further includes a guide rail; the guide rail is fixed in the vertical direction; the floating roller 200 is slidably connected to the guide rail; and the driving mechanism 300 drives the floating roller 200 along the guide rail to press against the fixed roller 100.

[0047] The guide rail is arranged in the vertical direction, and is used for slidingly cooperating with the seat on which the floating roller 200 is installed, and is used for guiding the floating roller 200 to press toward the fixed roller 100 in the vertical direction, and is also used for guiding the floating displacement direction of the floating roller 200, thereby improving the detection accuracy of the displacement sensor 500.

[0048] Reference Figure 1 and Figure 2 In this embodiment, the first gear 110 is fixed to at least one end of the fixed roller 100, and the second gear 210 is fixed to at least one end of the floating roller 200; the first gear 110 and the second gear 210 are positioned correspondingly and meshed with each other.

[0049] The fixed roller 100 and the floating roller 200 can be gear-engaged at one end, or at both ends of the fixed roller 100 and the floating roller 200. The gear engagement prevents slippage between the floating roller 200 and the fixed roller, thereby improving stability.

[0050] According to a device 10 for measuring the thickness of a pole piece and a diaphragm provided in this embodiment, the working principle of the device 10 for measuring the thickness of a pole piece and a diaphragm is as follows: the end of a fixed roller 100 is connected to an encoder 400, and precision guide rails are arranged on both sides of a floating roller 200. The cylinder drives the floating roller 200 to press the pole piece 700 or the diaphragm onto the fixed roller 100 with a certain pressure. At this time, the second gear 210 at the end of the floating roller 200 is meshed with the first gear 110 at the end of the fixed roller 100 to avoid slipping between the floating roller 200 and the fixed roller 100. A high The high-precision displacement sensor 500 is used. During the entire winding process, the pole piece 700 or the diaphragm will pass through the working gap 310 between the floating roller 200 and the fixed roller 100. When the thickness of the pole piece 700 or the diaphragm increases, the readings of the two linear displacement sensors 500 increase. When the thickness of the pole piece 700 decreases, the readings of the two linear displacement sensors 500 decrease. The readings of the two linear displacement sensors 500 can be used to obtain the highest point of each detection section, that is, the section when the first position of each floating roller 200 corresponds to the second position of the fixed roller 100. After detecting the real-time thickness of the pole piece 700 and the diaphragm, the embossing process and the tab cutting process can be adjusted in real time according to the thickness to improve the tab misalignment problem.

[0051] Each time the floating roller 200 is lifted to penetrate the pole piece 700 and pressed down, the current values ​​of the two displacement sensors 500 are recorded as the reference. Based on this, the increase or decrease in the value indicates that the thickness of the pole piece 700 or the diaphragm increases or decreases. The calibration reference is to reduce the influence of the error of the mechanism itself on the detection accuracy and improve the detection accuracy.

[0052] The electrode diaphragm thickness measuring device 10 provided in this embodiment has at least the following advantages:

[0053] When the pole piece 700 or the diaphragm passes through a group of floating rollers 200 and fixed rollers 100 that are pressed against each other, the change in thickness of the pole piece 700 or the diaphragm can be detected by detecting the displacement change of the floating roller 200, especially the ability to dynamically and accurately measure the thickness of the pole piece 700 and the diaphragm during high-speed winding.

[0054] The relative phase between the floating roller 200 and the fixed roller 100 is detected and determined by the phase measurement mechanism. The displacement sensor 500 measures the floating displacement of the floating roller 200 at the same phase position of the floating roller 200 and the fixed roller 100 each time, thereby improving the detection accuracy.

[0055] An embodiment of the utility model also provides a winding machine, which includes a winding device and a pole piece diaphragm thickness measuring device 10; the winding device is arranged downstream of the pole piece diaphragm thickness measuring device 10, and the winding device is used to wind the pole piece 700 and the diaphragm output from the pole piece diaphragm thickness measuring device 10.

[0056] The pole piece and diaphragm thickness measuring device 10 can accurately measure the thickness of the pole piece 700 and the diaphragm in real time during the winding process of the winding device, thereby improving the problem that the thickness of the pole piece 700 and the diaphragm cannot be accurately measured in real time during the winding process of the battery cell.

[0057] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A device for measuring the thickness of a pole piece diaphragm, characterized in that: include: Roller support seat; A fixed roller (100), the fixed roller (100) being rotatably connected to the roller support seat; A floating roller (200), a driving mechanism (300), the driving mechanism (300) being connected to the floating roller (200), the driving mechanism (300) being used to drive the floating roller (200) to press against the fixed roller (100), so as to form a working gap (310) between the floating roller (200) and the fixed roller (100) for passing a pole piece (700) or a diaphragm; a phase measurement mechanism, the phase measurement mechanism being connected to at least one of the floating roller (200) and the fixed roller (100), the phase measurement mechanism being used to detect a first position on a circumferential surface of the floating roller (200) and a second position on a circumferential surface of the fixed roller (100); and a displacement sensor (500), the displacement sensor (500) being connected to the floating roller (200), the displacement sensor (500) being used to measure the floating displacement of the floating roller (200) each time the first position of the floating roller (200) and the second position of the fixed roller (100) correspond.

2. The electrode diaphragm thickness measuring device according to claim 1, characterized in that: A first gear (110) is fixed to at least one end of the fixed roller (100), and a second gear (210) is fixed to at least one end of the floating roller (200); the first gear (110) and the second gear (210) are positioned correspondingly and meshed.

3. The electrode diaphragm thickness measuring device according to claim 1, characterized in that: The number of the displacement sensors (500) is two; the two displacement sensors (500) are respectively arranged at two ends of the floating roller (200), and the two displacement sensors (500) are respectively used to detect the floating displacement at the two ends of the floating roller (200).

4. The electrode diaphragm thickness measuring device according to claim 2, characterized in that: The phase measurement mechanism is an encoder (400) or a servo motor.

5. The device for measuring the thickness of a pole piece diaphragm according to claim 4, characterized in that: The phase measurement mechanism is an encoder (400), and the encoder (400) is fixed to the end of the fixed roller (100).

6. The device for measuring the thickness of a pole piece diaphragm according to claim 5, characterized in that: The number of the encoders (400) is two; one encoder (400) is fixed to each end of the floating roller (200) and the other to the end of the fixed roller (100).

7. The device for measuring the thickness of a pole piece diaphragm according to any one of claims 1 to 6, characterized in that: The driving mechanism (300) is a driving cylinder, a spring or a motor; the driving mechanism (300) is connected between the two ends of the floating roller (200).

8. The electrode diaphragm thickness measuring device according to claim 7, characterized in that: The electrode diaphragm thickness measuring device further comprises a fixing frame (600) and a fixing plate (610); both ends of the floating roller (200) are rotatably connected to the fixing frame (600); the fixing plate (610) is fixed to the fixing frame (600), and the plane where the fixing plate (610) is located is parallel to the center line of the floating roller (200); the displacement sensor (500) and the driving mechanism (300) are fixed to the fixing plate (610).

9. The electrode diaphragm thickness measuring device according to claim 1, characterized in that: The pole piece diaphragm thickness measuring device also includes a guide rail; the guide rail is fixed in a vertical direction; the floating roller (200) is slidably connected to the guide rail; and the driving mechanism (300) drives the floating roller (200) along the guide rail to press against the fixed roller (100).

10. A winding machine, characterized in that: The winding machine comprises a winding device and a pole piece diaphragm thickness measuring device as described in any one of claims 1 to 9; the winding device is arranged downstream of the pole piece diaphragm thickness measuring device, and the winding device is used to wind the pole piece (700) and diaphragm output from the pole piece diaphragm thickness measuring device.

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