Light path structure based on lithium battery roll core edge detection

Abstract

A light path structure based on lithium battery roll core edge detection comprises a light source module, a light path steering module, a lens group module, high-pass glass, a narrow-band optical filter and a receiver module which are sequentially arranged, the light source module comprises a light source emitter, and a first diaphragm is arranged at the emitting end of the light source emitter; the light path steering module comprises a second diaphragm, a reflecting mirror and a third diaphragm, and the light beam passing through the second diaphragm is steered by the reflecting mirror and then enters the third diaphragm; the lens group module comprises a concave lens and a positive double-meniscus lens, the positive double-meniscus lens is arranged on the front side of the high-pass glass, and the curvature radius of an emergent surface of the positive double-meniscus lens is larger than that of an incident surface of the positive double-meniscus lens; a shading shell is arranged at the light path steering module, stray light is effectively prevented from entering, and installation is convenient; the device has the advantages of high detection frequency and detection precision and low structural cost.

Description

Technical Field

[0001] The utility model relates to the field of optical technology, and in particular to an optical path structure based on lithium battery core edge detection. Background Art

[0002] Lithium battery winding, also known as the winding process, plays an important hub role in the lithium-ion battery manufacturing industry. Its purpose is to wind the positive and negative electrode sheets and separators into a complete semi-cell. During the winding process, it is necessary to ensure that the alignment of the positive and negative electrode sheets and separators is within ±0.5mm. Exceeding this range will cause the risk of short circuit in the battery cell, and may even cause fire and explosion during use. In order to ensure the production efficiency and production quality of the winding process, it is necessary to equip the winding machine with corresponding correction detectors, which mainly detect the position of the sheet through photoelectric sensors, and then control the actuator through the controller to correct the deviation, so that the sheet does not deviate when entering the winding.

[0003] At present, the photoelectric detection sensors for the edges of cells used in the lithium battery industry are mainly of infrared type. The infrared light emitted by the photoelectric detection sensor reaches the photosensitive chip for reception. When the lithium battery cell deviates during the winding process, it will block the infrared light. The photosensitive chip makes judgments and early warnings based on the light intensity, and feeds back information to the controller for deviation correction. However, domestic photoelectric sensors have many problems such as a large number of lenses used, poor collimation, and low uniformity, which limits the detection accuracy of the photoelectric sensor and can no longer meet the detection requirements of the lithium-ion battery winding process.

[0004] Therefore, in view of the deficiencies in the prior art, the utility model discloses an optical path structure based on lithium battery core edge detection to solve the above problems.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solution of the utility model and facilitating the understanding of those skilled in the art. It cannot be considered that the above contents are well known to those skilled in the art simply because they are explained in the background technology of the utility model. Utility Model Content

[0006] In order to overcome the deficiencies in the above-mentioned prior art, the purpose of the utility model is to disclose an optical path structure based on lithium battery core edge detection, which avoids external light interference by optimizing the design of the aperture and the lens group, and finally generates a collimated and highly uniform light beam, and cooperates with the CCD photosensitive chip for high-frequency sampling to improve the detection accuracy.

[0007] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by the utility model is: an optical path structure based on lithium battery core edge detection, including a light source module, an optical path steering module, a lens group module, a high-pass glass, a narrow-band filter and a receiver module arranged in sequence, wherein:

[0008] The light source module comprises a light source transmitter. A first aperture for intercepting the central light intensity of a light beam is arranged at an emitting end of the light source transmitter. The first aperture is coaxially arranged with the light source transmitter.

[0009] The light path steering module includes a second aperture for preventing stray light from entering, a reflector and a third aperture for controlling the range of the light beam. The second aperture is located at the entrance of the light path steering module and is coaxially arranged with the first aperture. The reflector is tilted. The light beam passing through the second aperture is redirected by the reflector and then incident on the third aperture. The third aperture is located at the exit of the light path steering module.

[0010] The lens group module includes a concave lens and a positive meniscus lens which are arranged in sequence at intervals. The concave lens is arranged behind the third aperture, and the positive meniscus lens is arranged in front of the high-pass glass. The curvature radius of the exit surface of the positive meniscus lens is greater than the curvature radius of the incident surface.

[0011] The preferred technical solution is: the light source emitter is a 650nm red light source emitter, which has a large divergence angle and is conducive to uniform light.

[0012] The preferred technical solution is: the light path redirection module also includes a fully covering light-shielding housing to prevent the entry of stray light.

[0013] The preferred technical solution is that the angle between the setting direction of the reflector and the central axis of the second aperture is 45°.

[0014] The preferred technical solution is that the reflector is a coated reflector.

[0015] The preferred technical solution is that an anti-reflection film is coated on the concave lens and the positive meniscus lens.

[0016] The preferred technical solution is that the concave lens and the positive bimenus lens are positioned and fixed by a light-shielding housing.

[0017] The preferred technical solution is: the receiver module is a CDD photosensitive chip, the data reading line speed can reach 9463 lines per second, the sampling speed is fast, and the data can be fed back to the actuator in time for correction.

[0018] Due to the application of the above technical solution, the optical path structure based on lithium battery core edge detection in the utility model has the following advantages:

[0019] (1) A light-shielding housing is designed at the optical path steering module to effectively prevent the entry of stray light and facilitate installation;

[0020] (2) An aperture is used to intercept the part with stronger light intensity in the center of the light beam and then a concave lens is used to expand the beam, thereby increasing the uniformity of the light path and improving the detection accuracy.

[0021] (3) The concave lens and the positive double meniscus lens are separated and combined to reduce spherical aberration, improve the collimation of the light beam, and increase the maximum measurement distance. At the same time, the number of lenses used in the entire optical path structure is small, the fixed focal length is small, and the optical path is shortened, which saves costs and reduces the overall volume.

[0022] (4) Anti-reflection coating is applied to the concave lens and the positive meniscus lens to reduce light reflection, increase transmittance, and prevent ghost images.

[0023] (5) The CCD photosensitive chip is used for rapid sampling, which improves the detection feedback speed and thus improves the correction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of an optical path structure based on lithium battery core edge detection in the utility model;

[0025] Figure 2 It is a structural schematic diagram of the light path steering module in the utility model.

[0026] In the above drawings, 1. light source module; 11. light source transmitter; 12. first aperture; 2. light path steering module; 21. second aperture; 22. reflector; 23. third aperture; 24. light shielding shell; 3. lens group module; 31. concave lens; 32. positive double meniscus lens; 4. high-pass glass; 5. narrow-band filter; 6. receiver module; 7. light beam. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] like Figure 1 As shown, the utility model discloses an optical path structure based on lithium battery core edge detection, including a light source module 1, an optical path steering module 2, a lens group module 3, a high-pass glass 4, a narrow-band filter 5 and a receiver module 6 arranged in sequence, wherein the receiver module 6 adopts a CDD photosensitive chip. The main components of the above utility model will be described in detail below:

[0030] like Figure 1 As shown, the light source module 1 uses a 650nm red light source emitter as the light source emitter 11 . The emitting end of the light source emitter 11 is provided with a first aperture 12 for intercepting the central light intensity of the light beam. The first aperture 12 is coaxially arranged with the light source emitter 11 .

[0031] like Figure 1 and Figure 2 As shown, the light path steering module 2 includes a second aperture 21 for preventing stray light from entering, a reflector 22, a third aperture 23 for controlling the range of the light beam, and a fully covering shading housing 24. The second aperture 21 is located at the entrance of the light path steering module 2 and is coaxially arranged with the first aperture 12. The setting direction of the reflector 22 is at an angle of 45° with the central axis of the second aperture 21, and the reflector 22 is a coated reflector. The light beam 7 passing through the second aperture 21 is redirected by the reflector 22 and then incident on the third aperture 23. The third aperture 23 is located at the exit of the light path steering module 2.

[0032] like Figure 1 and Figure 2As shown, the lens group module 3 includes a concave lens 31 and a positive meniscus lens 32 which are arranged in sequence at intervals, and the concave lens 31 and the positive meniscus lens 32 are coated with an anti-reflection film. The concave lens 31 is arranged behind the third aperture 23, and the positive meniscus lens 32 is arranged on the front side of the high-pass glass 4. The concave lens 31 and the positive meniscus lens 32 are positioned and fixed by a light-shielding shell 24.

[0033] refer to Figure 1 and Figure 2 As shown, when in use, the light source transmitter 11 emits a light beam 7, and the first aperture 12 intercepts the strongest light intensity interval in the center of the light beam 7. The light beam 7 passes through the second aperture 21 and enters the interior of the light path redirection module 2, and is redirected by the reflector 22 to be projected onto the third aperture 23, and then is corrected into collimated and uniform parallel light through the concave lens 31 and the positive bimenus lens 32 in sequence, and finally passes through the high-pass glass 4 and the narrow-band filter 5 in sequence to reach the receiver module 6 for reception.

[0034] In summary, compared with the prior art, the utility model has the following advantages: a light-shielding shell is used in combination with an aperture design to avoid interference from external light and improve detection accuracy; a concave lens and a positive double-menus lens are used in a separate combination to reduce spherical aberration, improve the collimation of the light beam, and increase the maximum measuring distance. At the same time, the number of lenses used in the entire optical path structure is small, the fixed focal length is small, the optical path distance is shortened, and the cost is saved while the overall volume is smaller; a CCD photosensitive chip is used for rapid sampling, which improves the detection feedback speed and thereby improves the correction speed.

[0035] The above embodiment provided by the utility model is only an example of the principle and effect of the utility model, and is not used to limit the utility model. Anyone familiar with this technology can modify or change the above embodiment without violating the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. An optical path structure based on lithium battery core edge detection, characterized in that: The invention comprises a light source module (1), a light path redirection module (2), a lens group module (3), a high-pass glass (4), a narrow-band filter (5) and a receiver module (6) which are arranged in sequence, wherein: The light source module (1) comprises a light source emitter (11), a first aperture (12) for intercepting the central light intensity of a light beam is provided at an emitting end of the light source emitter (11), and the first aperture (12) is coaxially arranged with the light source emitter (11); The light path steering module (2) comprises a second aperture (21) for preventing stray light from entering, a reflector (22), and a third aperture (23) for controlling the range of a light beam, wherein the second aperture (21) is located at the entrance of the light path steering module (2) and is coaxially arranged with the first aperture (12), the reflector (22) is arranged at an angle, and the light beam passing through the second aperture (21) is redirected by the reflector (22) and then incident on the third aperture (23), and the third aperture (23) is located at the exit of the light path steering module (2); The lens group module (3) comprises a concave lens (31) and a positive meniscus lens (32) which are arranged in sequence and spaced apart from each other; the concave lens (31) is arranged behind the third aperture (23); and the positive meniscus lens (32) is arranged in front of the high-pass glass (4).

2. The optical path structure based on edge detection of a lithium battery core according to claim 1, characterized in that: The light source emitter (11) is a 650nm red light source emitter.

3. The optical path structure based on edge detection of a lithium battery core according to claim 1, characterized in that: The light path redirection module (2) also includes a fully covering light-shielding housing (24).

4. The optical path structure based on edge detection of a lithium battery core according to claim 1, characterized in that: The angle between the setting direction of the reflector (22) and the central axis of the second aperture (21) is 45°.

5. The optical path structure based on edge detection of a lithium battery core according to claim 1, characterized in that: The reflector (22) is a film-coated reflector.

6. The optical path structure based on edge detection of a lithium battery core according to claim 1, characterized in that: The concave lens (31) and the positive bimenus lens (32) are coated with an anti-reflection film.

7. The optical path structure based on edge detection of a lithium battery core according to claim 1, characterized in that: The concave lens (31) and the positive bimenus lens (32) are positioned and fixed via a light-shielding housing (24).

8. The optical path structure based on edge detection of a lithium battery core according to claim 1, characterized in that: The receiver module (6) is a CDD photosensitive chip.

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