Shading type diaphragm photoelectric deviation correction sensor

Abstract

The utility model discloses a shading type diaphragm photoelectric deviation rectifying sensor which comprises an outer box body, a photosensitive diode matrix, a passing roller and a light source. A passing roller is mounted in the outer box body, a photosensitive diode matrix is arranged in the passing roller, and a light source corresponding to the photosensitive diode matrix is arranged at the top of the inner side of the outer box body; and the diaphragm penetrates through the outer box body, penetrates through the space between the photosensitive diode matrix and the light source, and finally penetrates out of the outer box body. The photosensitive diode matrix is arranged in the transparent passing roller, the light source is arranged at the position, corresponding to the photosensitive diode, of the outer box body, the shading amount of the diaphragm is detected through cooperation of the photosensitive diode and the light source, and the change value of the corresponding voltage is output to the deviation correction executing mechanism of the diaphragm; by adopting the mode, the position offset distance of the diaphragm material can be accurately measured, the misjudgment risk caused by collapse of the edge of the diaphragm is avoided, the photoelectric sensor is not limited by the thickness of the diaphragm, and a basis is provided for application and production of the diaphragm with lower thickness.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to a light-shielding diaphragm photoelectric deviation correction sensor. Background Art

[0002] In the lithium battery manufacturing process, winding the positive and negative electrodes and diaphragms into battery cells is a critical step. There are two common winding types: square and cylindrical. The deviation control is the most critical system in the winding process. Diaphragm deviation correction mostly uses ultrasonic deviation correction sensors and controller closed-loop to achieve high-precision monitoring of diaphragm displacement.

[0003] As the requirements for high energy density and high ion conduction efficiency of lithium batteries increase, the diaphragm is becoming thinner and thinner. It is common to see diaphragm wrinkles during the winding process of the battery cells in production. Diaphragm wrinkles can lead to uneven distribution of battery internal resistance, local lithium deposition, and short circuit risks, which are risk items that are not allowed to occur in production. In addition to factors such as inappropriate winding tension and inappropriate diaphragm unwinding position, in more cases, the diaphragm is suspended on both sides when passing through the U-shaped ultrasonic correction sensor, and the diaphragm curls on one side of the correction, causing the correction sensor to fail to sense the real edge. The thinner the diaphragm, the weaker its own support force and the greater the curling possibility. The controller feeds back the wrong diaphragm edge position coordinates, and the controller sends a correction command to the actuator to adjust the position of the diaphragm unwinding plate, resulting in a mismatch between the horizontal position of the diaphragm and the diaphragm entry position at the winding needle, resulting in continuous diaphragm wrinkles. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to solve the diaphragm wrinkle phenomenon caused by the collapse of the diaphragm edge.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A light-shielding diaphragm photoelectric deviation correction sensor comprises an outer box body, a photodiode matrix, a roller and a light source; a roller is installed inside the outer box body, and a photodiode matrix is ​​arranged inside the roller, and a light source corresponding to the photodiode matrix is ​​arranged on the inner top of the outer box body; the diaphragm passes through the outer box body, passes between the photodiode matrix and the light source, and finally passes out of the outer box body.

[0007] The present application sets a photodiode matrix in the transparent roller, sets a light source on the outer box body at a position corresponding to the photodiode, realizes the detection of the light shielding amount of the diaphragm through the cooperation of the photodiode and the light source, and outputs the corresponding voltage change value to the diaphragm correction actuator. In this way, the position offset distance of the diaphragm material can be accurately measured. Compared with the existing correction sensor technology, the risk of misjudgment caused by the collapse of the diaphragm edge is avoided. The photoelectric sensor is not limited by the thickness of the diaphragm, and provides a basis for the application and production of diaphragms with lower thickness.

[0008] As a further solution of the utility model: the width of the light source is greater than the width of the diaphragm.

[0009] As a further solution of the utility model: the photodiode matrix is ​​in a long strip structure, and the light path formed by the light source irradiation is also in a long strip structure.

[0010] As a further solution of the utility model: the width of the photodiode matrix is ​​greater than the width of the diaphragm.

[0011] As a further solution of the utility model: the front and rear sides of the outer box body are symmetrically provided with diaphragm grooves corresponding to the diaphragm.

[0012] As a further solution of the utility model: the roller is a light-transmitting transparent resin roller.

[0013] As a further solution of the utility model: the outer box body is a light-shielding dark box.

[0014] As a further solution of the utility model: the light source adopts a long strip-shaped constant intensity light source.

[0015] As a further solution of the utility model: the photodiode matrix is ​​electrically connected to a load resistor, and the voltage value change on the load resistor can be obtained by detecting the distance that the diaphragm deviates from the center of the roller, and the voltage value signal is transmitted to the deviation correction controller.

[0016] As a further solution of the utility model: the position relationship between the output voltage on the load resistor and the diaphragm is:

[0017]

[0018] Where a represents the length of the photodiode matrix, in mm;

[0019] x represents the distance that the diaphragm covers the photodiode matrix, in mm;

[0020] u represents the output voltage of the load resistor in mV.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] First, the present application sets a photodiode matrix in the transparent roller, sets a light source on the outer box body at a position corresponding to the photodiode, realizes the detection of the light shielding amount of the diaphragm through the cooperation of the photodiode and the light source, and outputs the corresponding voltage change value to the diaphragm correction actuator. This method can accurately measure the position offset distance of the diaphragm material, and avoids the risk of misjudgment caused by the collapse of the diaphragm edge compared with the existing correction sensor technology. The photoelectric sensor is not limited by the thickness of the diaphragm, providing a basis for the application and production of diaphragms with lower thickness;

[0023] Secondly, the correction technology of the present application avoids the risk of the diaphragm material shaking when passing through the sensor in a suspended state, is not affected by the environmental wind and is not limited by the diaphragm tape speed, and the correction sensor can stably grasp the edge of the material; it solves the problem that the existing ultrasonic correction sensor technology causes the material to shake due to the influence of the environmental wind speed, the fast running speed aggravates the diaphragm shaking phenomenon, and the unstable edge position of the material causes the correction device to frequently operate;

[0024] Finally, the correction technology of the present application sets a light source transmitting head and a photodiode matrix receiving head of the same size and shape, forming a linear relationship between the position of the inspected material and the output voltage, thereby improving the measurement accuracy of the material deviation distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a light-shielding diaphragm photoelectric deviation correction sensor according to an embodiment of the utility model;

[0026] Figure 2 This is a partial structural schematic diagram of a light-shielding diaphragm photoelectric deviation correction sensor according to an embodiment of the utility model;

[0027] Figure 3 This is a graph showing input-output characteristic curves of the transmitting end and the receiving end of the light-shielding diaphragm photoelectric deflection correction sensor according to an embodiment of the utility model;

[0028] Explanation of the reference numerals: 1. outer box body; 2. diaphragm groove; 3. diaphragm; 4. photodiode matrix; 5. roller; 6. light source. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Reference Figure 1 and Figure 2A light-shielding diaphragm photoelectric deflection correction sensor comprises an outer box body 1, a diaphragm groove 2, a photosensitive diode matrix 4, a roller 5 and a light source 6, wherein the photosensitive diode matrix 4, the roller 5 and the light source 6 are all distributed inside the outer box body 1, and the diaphragm groove 2 is symmetrically arranged on the front and rear sides of the outer box body 1, and the diaphragm 3 that needs to be corrected in this application can enter the outer box body 1 from the front diaphragm groove 2 on the outer box body 1, and then fit the roller 5 for transmission, and the photosensitive diode matrix 4 in the roller 5 is located below the diaphragm 3 at this time, and the light source 6 is located above the diaphragm 3, and then the diaphragm 3 passes through the rear diaphragm groove 2 on the outer box body 1, and this process can realize the photoelectric deflection correction of the diaphragm.

[0031] Reference Figure 1 The outer box body 1 as a whole adopts an opaque dark box, which can be used for shading. The roller 5 and the light source assembly are installed inside the dark box, which can just block the interference of the external light source to the inside of the box body. The diaphragm groove 2 opened on the front and rear sides of the outer box body 1 is wider than the diaphragm 3, so as to facilitate the passage of diaphragms of different sizes, thereby improving the adaptability of the dark box.

[0032] Reference Figure 1 A photodiode matrix 4 is arranged inside the roller 5. The roller 5 is made of transparent resin and can transmit light. The photodiode matrix 4 is in a long strip structure and has the same shape as the light source 6. The light source 6 is arranged on the inner top of the outer box body 1, and the photodiode matrix 4 and the light source 6 are symmetrically arranged inside and outside the roller 5. It should be noted that the widths of the photodiode matrix 4 and the light source 6 are both greater than the width of the diaphragm 3.

[0033] Furthermore, a reverse voltage is set at both ends of the photodiode matrix 4 to increase the reverse current.

[0034] Furthermore, the light source 6 is a long strip light source with constant intensity.

[0035] Furthermore, a load resistor is electrically connected to the photodiode matrix 4 .

[0036] The detection principle of the diaphragm deviation correction sensor of the present application is: a long strip photodiode matrix 4 is arranged inside the transparent resin roller 5, and a long strip constant intensity light source 6 is arranged on the upper part of the roller 5 facing the photodiode matrix 4: when there is no light, it has only a small dark current like an ordinary diode; when there is light, the transparent window on the shell of the photodiode 4 receives light irradiation, and the light energy is transferred to the bound electrons on the covalent bond, and the carriers are excited to generate electron holes, namely photoelectric carriers. Under the action of the external electric field, the photoelectric carriers participate in conduction, generating a reverse current much larger than the dark current, namely the photocurrent, and the voltage signal on the load resistor is proportional to the size of the photocurrent. The size of the photocurrent is proportional to the number of diodes in the photosensitive state.

[0037] The specific steps of this application are as follows:

[0038] (1) The diaphragm material position is preset to have a balance position, an upper limit position, and a lower limit position. The balance position of the diaphragm is the initial position, which is not offset from the diaphragm winding position at the winding needle. The diaphragm blocks half of the photosensitive area of ​​the diode matrix 4 as a benchmark. At this time, the voltage signal value of the load resistor is X; the upper limit position is preset to be when the diaphragm 3 completely blocks the diode matrix, and the voltage signal on the load resistor is the minimum value; the lower limit position is preset to be when the diaphragm does not block the light-transmitting area, and the voltage signal on the load resistor reaches the maximum value;

[0039] (2) The diaphragm runs from the top of the transparent roller 5. When the diaphragm 3 blocks a part of the light flux emitted by the light source, the area of ​​the light flux projected onto the photodiode matrix 4 changes. The degree of change is linearly related to the position of the object to be measured in the light path.

[0040] (3) The distance that the diaphragm material deviates from the center is detected to obtain the voltage value change on the load resistor. The voltage value signal is transmitted to the correction controller, which converts it into an electrical signal; the correction controller transmits it to the external correction actuator of the diaphragm, and then outputs it to the servo motor (the servo motor is the motor that controls the diaphragm transmission) to move the unwinding plate station, so that the load voltage signal returns to the X value, and the negative feedback closed-loop correction control is completed to restore the diaphragm to the equilibrium position. The servo motor responds quickly to control the output torque, so that the material position moves a certain distance within the preset position range for high-precision control.

[0041] The relationship between the output voltage on the load resistor and the position of the material being tested (diaphragm 3) is:

[0042]

[0043] See attached for details Figure 3 Input-output characteristic curve of the transmitting and receiving ends of the photoelectric correction sensor.

[0044] Where a represents the length of the photodiode matrix, in mm;

[0045] x represents the distance that the inspected material covers the photodiode matrix, in mm;

[0046] u represents the output voltage of the load resistor in mV.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light-shielding diaphragm photoelectric correction sensor, characterized in that: The invention comprises an outer box body (1), a photosensitive diode matrix (4), a roller (5) and a light source (6); the roller (5) is installed inside the outer box body (1), the photosensitive diode matrix (4) is arranged inside the roller (5), and a light source (6) corresponding to the photosensitive diode matrix (4) is arranged on the inner top of the outer box body (1); The diaphragm penetrates through the outer box body (1), passes between the photosensitive diode matrix (4) and the light source (6), and finally passes out of the outer box body (1).

2. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 1, characterized in that: The width of the light source (6) is greater than the width of the diaphragm.

3. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 1, characterized in that: The photosensitive diode matrix (4) is in the form of a long strip structure, and the light path formed by the illumination of the light source (6) is also in the form of a long strip structure.

4. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 3 is characterized in that: The width of the photodiode matrix (4) is greater than the width of the diaphragm.

5. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 1, characterized in that: The front and rear sides of the outer box body (1) are symmetrically provided with diaphragm grooves (2) corresponding to the diaphragms.

6. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 1, characterized in that: The roller (5) is made of a light-transmitting transparent resin material.

7. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 1, characterized in that: The outer box body (1) is a light-shielding dark box.

8. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 1, characterized in that: The light source (6) is a long strip-shaped constant intensity light source.

9. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 1, characterized in that: The photodiode matrix (4) is electrically connected to a load resistor, and a voltage value change on the load resistor can be obtained by detecting the distance that the diaphragm deviates from the center of the roller (5), and the voltage value signal is transmitted to the deviation correction controller.

10. The light-shielding diaphragm photoelectric deviation correction sensor according to claim 9, characterized in that: The relationship between the output voltage on the load resistor and the position of the diaphragm is: Where a represents the length of the photodiode matrix, in mm; x represents the distance that the diaphragm covers the photodiode matrix, in mm; u represents the output voltage of the load resistor in mV.

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