Combined lightening method and detection method of aluminum shell battery cell

Abstract

The application discloses a combined lighting method and a detection method of an aluminum shell battery cell. The combined lighting method comprises a lighting assembly, and the lighting assembly comprises a coaxial light source and a plurality of strip-shaped light sources surrounding the coaxial light source. The combined lighting method specifically comprises the following steps: the coaxial light source and the plurality of strip-shaped light sources are turned on at the same time, and the product to be detected is synchronously lighted; a shooting assembly delays for T2+T3, and then photographs the product to be detected; wherein T2 is the time when the shooting assembly receives a photographing instruction after the coaxial light source and the plurality of strip-shaped light sources are turned on at the same time. The combined lighting method is used for lighting the product to be detected by cooperation of the strip-shaped light sources and the coaxial light source, so that when the product to be detected is photographed by a shooting device, the strip-shaped light sources which surround the product to be detected and are obliquely lighted and the coaxial light source which vertically lights the product to be detected can make the product to be detected in a high-brightness state, thereby avoiding that changes in external light intensity and direction affect the product detection, and further guaranteeing the detection efficiency and the detection quality of the visual detection device on the appearance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lighting methods, in particular, mainly relates to a combined lighting method and detection method of aluminum shell battery. BACKGROUND

[0002] The visual detection device is a device for detecting whether there are scratches, depressions and notches on the surface of the product, thereby screening out defective products produced to ensure production quality. The traditional visual detection device mainly takes a picture of the product detection surface through a shooting device and uploads it to a computer for picture comparison to detect surface defects of the product. However, the traditional visual detection device is seriously affected by light when taking pictures, resulting in problems such as shadows in the pictures taken or different brightness of the front and back pictures, which affects the detection efficiency and quality. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a combined lighting method and detection method of aluminum shell battery.

[0004] The combined lighting method disclosed by the present application comprises a lighting assembly, wherein the lighting assembly comprises a coaxial light source and a plurality of strip-shaped light sources surrounding the coaxial light source; and further comprises the following steps:

[0005] The coaxial light source and the plurality of strip-shaped light sources are simultaneously turned on to synchronously light the surface of the product to be detected;

[0006] The photographing assembly takes a picture of the surface of the product to be detected after a delay of T2+T3; wherein T2 is the time when the photographing assembly receives a picture-taking instruction after the coaxial light source and the plurality of strip-shaped light sources are simultaneously turned on, and T3 is a preset delay time for taking a picture after the photographing assembly receives the trigger instruction.

[0007] According to an embodiment of the present application, before the coaxial light source and the plurality of strip-shaped light sources are simultaneously turned on to synchronously light the surface of the product to be detected, the method further comprises:

[0008] Adjusting the angle of the plurality of strip-shaped light sources facing the surface of the product to be photographed according to the size and shape of the surface of the product to be photographed.

[0009] According to an embodiment of the present application, adjusting the angle of the plurality of strip-shaped light sources facing the surface of the product to be photographed according to the size and shape of the surface of the product to be photographed comprises the following sub-steps:

[0010] According to the size and shape of the surface of the product to be photographed, the angle of the plurality of strip-shaped light sources facing the surface of the product to be photographed is calculated;

[0011] Each of the strip light sources rotates along the adjusting groove on the mounting frame to be adjusted to a calculated facing angle; wherein, the angle adjustment range of each of the strip light sources facing the product is between zero and ninety degrees;

[0012] The strip light source after the angle adjustment is fixed.

[0013] According to an embodiment of the present application, one side of the coaxial light source is provided with a beam splitter between the detection device and the product.

[0014] According to an embodiment of the present application, the beam splitter is inclined at forty-five degrees relative to the shooting direction of the shooting assembly.

[0015] According to an embodiment of the present application, the coaxial light source and the plurality of strip light sources are simultaneously turned on to synchronously light the product to be detected, comprising the following sub-steps:

[0016] The coaxial light source is laterally lighted;

[0017] The beam splitter turns the lateral light to obtain the coaxial light;

[0018] The coaxial light is perpendicularly lighted on the product detection surface.

[0019] According to an embodiment of the present application, the coaxial light source and the plurality of strip light sources are simultaneously turned on to synchronously light the product to be detected, further comprising the following sub-steps:

[0020] The strip light source and the coaxial light source are lighted in the form of brightening frequency flash.

[0021] According to an embodiment of the present application, the coaxial light source and the plurality of strip light sources are simultaneously turned on to synchronously light the product to be detected, further comprising the following sub-steps:

[0022] The light emitted by the strip light source and the coaxial light source is blue strip light with a wavelength of 450 nm.

[0023] According to an embodiment of the present application, the number of strip light sources is at least three, and the first and the last are connected.

[0024] A detection method of an aluminum shell battery cell, comprising:

[0025] Placing the battery cell in a detection station and making the battery cell to be detected perpendicular to the detection direction of the shooting assembly;

[0026] The light assembly lights the battery cell to be detected according to the combined light method;

[0027] The shooting assembly shoots the battery cell to be detected and uploads to the computer for picture comparison to detect the quality of the battery cell.

[0028] The beneficial effects of this application are as follows: by using a combination of bar light source and coaxial light source to illuminate the product inspection surface, when the product inspection surface is photographed by the imaging device, the bar light source with surrounding oblique illumination and the coaxial light source with vertical illumination can keep the product inspection surface in a bright state, thereby avoiding the influence of changes in the intensity and orientation of external light on product inspection, and thus ensuring the inspection efficiency and inspection quality of the visual inspection device for appearance. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a flowchart of the combined lighting method in the embodiment;

[0031] Figure 2 This is a flowchart of sub-step S1 in the embodiment;

[0032] Figure 3 This is one of the structural schematic diagrams of the visual inspection device in the embodiments;

[0033] Figure 4 This is the second schematic diagram of the visual inspection device in the embodiment;

[0034] Figure 5 This is the third schematic diagram of the visual inspection device in the embodiment;

[0035] Figure 6 This is the fourth schematic diagram of the visual inspection device in the embodiment;

[0036] Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point A in the middle;

[0037] Figure 8 A schematic diagram of the optical path for illuminating a coaxial light source.

[0038] In the attached diagram, 100 represents the battery cell;

[0039] 1-Visual inspection unit;

[0040] 11-Shooting components, 12-Lighting components, 13-Stand;

[0041] 111-Shooting component, 112-First adjustment component;

[0042] 121-Coaxial light source, 122-Bar light source, 123-Second adjustment component;

[0043] 1121 - First adjusting seat, 1122 - First adjusting component;

[0044] 1211-spectroscope. DETAILED DESCRIPTION

[0045] The application will be illustrated below with multiple embodiments, and many practical details will be described in the following description for the purpose of clear illustration. However, it should be understood that these practical details should not be used to limit the application. That is, in some embodiments of the application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0046] It should be noted that all directional indications such as upper, lower, left, right, front, back, etc. used in the embodiments of the application merely serve to explain the relative position relationship, movement condition, etc. between components in a certain specific posture shown in the drawings, and if the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, the description such as "first", "second" and the like in the application is only for the purpose of description, and does not mean to specially indicate the order or sequence, nor to limit the application, which is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the application.

[0048] In order to further understand the application content, characteristics and effects of the application, the following examples are given, and the detailed description is as follows in conjunction with the drawings:

[0049] Example 1

[0050] Reference Figure 3 and Figure 4 , Figure 3 is one of the structural schematic diagrams of the visual detection device in the embodiment; Figure 4 is the second structural schematic diagram of the visual detection device in the embodiment. The visual detection device in this embodiment comprises: an electric core 100; two visual detection units 1, which are respectively arranged on the opposite sides of the electric core 100;

[0051] Each visual detection unit 1 comprises a shooting assembly 11 and a lighting assembly 12, the shooting assembly 11 is located on the side of the lighting assembly 12 away from the battery cell 100, the lighting assembly 12 comprises a coaxial light source 121 and a plurality of linear light sources 122, the shooting end of the shooting assembly 11 faces the surface to be detected of the battery cell 100, the coaxial light source 121 is arranged coaxially with the surface to be detected of the battery cell 100, so that when the battery cell 100 is detected, the ghosting of the image can be effectively eliminated by the coaxial light, and the defect features of the uneven surface such as dents and scratches can be highlighted, the plurality of linear light sources 122 are arranged around the axis and respectively face the surface to be detected of the battery cell 100 for lighting, the linear combined light is composed of a plurality of linear light sources 122, each linear light source 122 can realize the adjustment of different brightness and different angles to realize different effects, has the characteristics of good universality and strong adaptability, and the combined lighting system is composed of the linear combined light with high brightness and high uniformity and the adjustable angle and the high-uniformity coaxial light source 121, the lighting system can present different effects of the corresponding appearance defects in a specific state so as to be captured by the vision system, thereby further enhancing the detection effect of the battery cell 100, and further enhancing the shooting detection effect of the battery cell 100, and avoiding the occurrence of shadow in the lighting process to affect the detection effect.

[0052] With reference to Figure 8 , Figure 8 is a schematic view of the lighting path of the coaxial light source. The coaxial light source 121 is provided with a beam splitter 1211, the beam splitter 1211 is arranged obliquely relative to the shooting direction of the coaxial light source 121, and the beam splitter 1211 reflects the light emitted by the coaxial light source 121, and the reflected light is perpendicular to the mirror surface of the shooting assembly 11 and the surface to be detected of the battery cell 100, which can effectively eliminate the ghosting of the image. The defect features of the uneven surface such as dents and scratches can be highlighted.

[0053] Preferably, the oblique angle of the beam splitter 1211 is forty-five degrees; the horizontal light emitted by the coaxial light source 121 passes through the forty-five-degree beam splitter 1211, and the reflected light is on the same axis as the shooting assembly 111 and the battery cell 100.

[0054] With reference to Figure 3 and Figure 7 , Figure 7 is Figure 6The structure of the middle A is enlarged and shown. The shooting assembly 11 comprises a shooting component 111 and a first adjusting component 112. The shooting component 111 shoots one side of the battery cell 100. The shooting component 111 is an industrial camera with a resolution, and is matched with an industrial lens. The first adjusting component 112 is connected with the shooting component 111. The first adjusting component 112 adjusts the distance between the shooting component 111 and the battery cell 100. When the battery cell 100 is shot and detected, the distance between the shooting component 111 and the battery cell 100 can be adjusted by the first adjusting component 112. The focal length of the shooting component 111 can be adjusted in this way, so that the first adjusting component 112 can shoot more clearly.

[0055] Referring back to Figures 3-7 The first adjusting component 112 comprises a first adjusting seat 1121 and a first adjusting piece 1122. The shooting component 111 is arranged on the first adjusting seat 1121. The first adjusting piece 1122 is arranged at one end of the first adjusting seat 1121. The first adjusting piece 1122 adjusts the shooting component 111 along the first adjusting seat 1121. When the shooting component 111 is adjusted, the shooting component 111 can be driven to move by the first adjusting piece 1122. The shooting component 111 moves relative to the battery cell 100 and the lighting assembly 12, so as to adjust the shooting effect.

[0056] Preferably, the first adjusting piece 1122 is a screw rod. The shooting component 111 is adjusted in a forward or reverse rotation manner. The shooting component 111 can be adjusted manually. The first adjusting piece 1122 is driven to rotate by an electric motor. The best detection distance corresponding to different battery cells 100 can be stored. When the battery cell 100 is replaced, the shooting component 111 can be automatically moved to a fixed position, so as to further improve the adjusting efficiency of the shooting component 111.

[0057] Referring back to Figure 3 and Figure 4 The lighting assembly 12 further comprises a second adjusting component 123. The second adjusting component 123 is connected with the coaxial light source 121. The second adjusting component 123 adjusts the distance between the coaxial light source 121 and the battery cell 100. When the battery cell 100 is lighted by the coaxial light source 121, the distance between the coaxial light source 121 and the battery cell 100 can be adjusted by the second adjusting component 123. The lighting intensity of the coaxial light source 121 on the battery cell 100 is adjusted. The lighting intensity is guaranteed to be appropriate. The influence of too strong or too weak light and the intensity of external environmental light on the detection effect is avoided.

[0058] Preferably, the adjusting directions of the first adjusting component 112 and the second adjusting component 123 are perpendicular to the surface to be detected of the battery cell 100. By limiting the adjusting directions of the first adjusting component 112 and the second adjusting component 123, when the photographing component 111 and the coaxial light source 121 are adjusted, only the focal length of the photographing component 111 and the lighting of the coaxial light source 121 are changed, and the photographing position of the battery cell 100 is not affected, so that when the battery cell 100 is detected, no matter how the photographing component 111 and the coaxial light source 121 are adjusted, the battery cell 100 only needs to be moved to a fixed position to be detected.

[0059] Referring back to Figure 3 and Figure 4 , one photographing assembly 11 and one lighting assembly 12 form a group of detection devices to detect one surface of the battery cell 100, so that the photographing assembly 11 and the lighting assembly 12 are arranged in groups to detect the battery cell 100, and any two photographing assemblies 11 or lighting assemblies 12 can form a group to complete detection, so that when the photographing assembly 11 or the lighting assembly 12 is damaged, the detection device can be repaired by replacing the photographing assembly 11 or the lighting assembly 12, further improving the detection efficiency.

[0060] Referring back to Figure 3 and Figure 4 , the lighting angle of the strip-shaped light source 122 is adjusted within a range of zero to one hundred and eighty degrees, so that the lighting position of the strip-shaped light source 122 can be adjusted by rotating the strip-shaped light source 122, so as to adjust the light gathering position, thereby avoiding the situation that the shooting effect is affected due to too strong or too weak light, so as to further enhance the lighting effect of the combined lighting system on the battery cell 100.

[0061] The visual detection unit 1 further comprises a support 13, the photographing assembly 11 and the lighting assembly 12 are arranged on the support 13 and are supported by the support 13, and the photographing assembly 11 and the lighting assembly 12 are conveniently adjusted.

[0062] Referring back to Figure 5 and Figure 6 , Figure 5 is a structure schematic view of the visual detection device in the embodiment three; Figure 6 is a structure schematic view of the visual detection device in the embodiment four. The single visual detection unit 1 is arranged on one side of the battery cell 100 and detects one surface of the battery cell 100, so that when only one surface of the battery cell 100 needs to be detected, only one visual detection unit 1 is controlled to work to detect the surface to be detected, reducing energy consumption.

[0063] Referring back to Figures 3-8When the battery cell 100 is detected, first, the battery cell 100 is placed on the detection position of the detection device, then the combined light of the light assembly 12 is used to light the surface to be detected of the battery cell 100, and the camera component 111 is used to take a photo of the battery cell 100 in the light state, after completion, the battery cell 100 is rotated, and the above steps are repeated to detect the surface not yet detected, so as to complete the detection of the battery cell 100.

[0064] Embodiment two

[0065] With reference to Figure 1 , Figure 1 The flowchart of the combined light method in the embodiment. The combined light method in the embodiment is realized based on the visual detection unit 1 in the embodiment one, and specifically includes the following steps:

[0066] S1, the coaxial light source 121 and the plurality of linear light sources 122 are turned on at the same time to synchronously light the surface to be detected of the product;

[0067] S2, the camera assembly 11 takes a photo of the surface to be detected of the product after a delay of T2+T3; wherein T2 is the time when the camera assembly 11 receives the triggering photo instruction after the coaxial light source 121 and the plurality of linear light sources 122 are turned on at the same time, and T3 is the preset delay photo time after the camera assembly 11 receives the triggering instruction.

[0068] The coaxial light source 121 and the linear light source 122 cooperate to light the product, so that when the product is lighted, the surface to be detected of the product can be completely illuminated, and the brightness of the surface to be detected can be uniform, thereby ensuring the photo quality when the camera assembly 11 takes a photo of the product, and improving the detection efficiency of the visual detection device.

[0069] Before the coaxial light source 121 and the plurality of linear light sources 122 are turned on at the same time to synchronously light the surface to be detected of the product, it further includes:

[0070] The angle of the plurality of linear light sources 122 facing the surface to be photographed of the product is adjusted according to the size and shape of the surface to be photographed of the product.

[0071] It can be understood that the area and size of the surface to be detected of different types of products are different, in order to ensure that the linear light source 122 can light the product uniformly and completely cover the surface to be detected of the product when lighting the product, so as to improve the light quality of the combined light method for the surface to be detected of any product when detecting the product, thereby improving the applicability of the combined light method.

[0072] The angle of the plurality of linear light sources 122 facing the surface to be photographed of the product is adjusted according to the size and shape of the surface to be photographed of the product, including the following sub-steps:

[0073] Based on the size and shape of the product to be photographed, the angles of multiple strip light sources 122 facing the product to be photographed are calculated;

[0074] Each strip light source 122 rotates along the adjustment slot on the mounting bracket to adjust to a calculated facing angle; wherein the angle adjustment range of each strip light source facing the product is between zero and ninety degrees;

[0075] Fix the strip light source after the angle adjustment is completed.

[0076] It is understandable that by setting an adjustable-angle bar light source 122, the lighting direction of the bar light source 122 can be adjusted within the range from perpendicular to the surface to be inspected to parallel to the surface to be inspected. This ensures that the lighting position of the bar light source 122 can be adjusted according to the needs, thereby improving the lighting efficiency and lighting quality of the combined lighting method, and thus improving the inspection quality.

[0077] Reference Figure 2 , Figure 2 The flowchart for sub-step S1 in this embodiment is as follows: In step S1, the coaxial light source 121 and multiple strip light sources 122 are simultaneously lit to synchronously illuminate the surface of the product to be inspected, including the following sub-steps:

[0078] S11, the coaxial light source 121 illuminates horizontally, and the illumination direction of the coaxial light source 121 is perpendicular to the shooting direction of the shooting component 11;

[0079] S12, beam splitter 1211 redirects the transverse light to obtain coaxial light;

[0080] S13, the coaxial light is directed perpendicularly to the product inspection surface. Under the action of the beam splitter 1211, the coaxial light can be redirected from the side to the product inspection surface, thereby illuminating a large area of ​​the product inspection surface.

[0081] Preferably, the tilt angle of the beam splitter 1211 is 45 degrees, which allows the beam splitter 1211 to refract and reflect the transverse light incident on it, and to reflect part of the transverse light toward the surface of the product to be inspected, while the other part of the coaxial light is refracted toward the direction of the imaging component 11, thereby converting the transverse light into coaxial light in the same direction as the imaging direction of the imaging component 11, thus ensuring the lighting efficiency of the product and making the lighting more uniform.

[0082] The coaxial light source 121 and multiple strip light sources 122 are lit simultaneously to synchronously illuminate the surface of the product to be inspected. This also includes the following sub-steps:

[0083] The bar light source 122 and the coaxial light source 121 are lighted in a brightening frequency flash mode. The lighted in the brightening frequency flash mode can instantaneously increase the brightness of the light source by several times, effectively shortens the exposure time of the camera, improves the performance of the shooting assembly 11, and further enhances the detection effect and efficiency of the battery cell 100.

[0084] The controller delays T1 to light the light source connected to the output end of the controller. T1 is the time delay after the controller receives an external trigger signal. T1 is less than or equal to 50us. The light source connected to the output end of the controller is lighted for a time T5 set by the controller panel. T5 is less than or equal to 999us. Then the shooting assembly 11 delays T2+T3 to take a picture of the product to be detected. T2 is less than or equal to 50us. T3 is less than or equal to 50us. At this time, the brightness of the picture taken is the brightest. After the shooting assembly 11 finishes taking a picture, the light source is turned off, and a working cycle is completed.

[0085] The time interval between the two triggers cannot be less than 1.42ms, so that the brightness of the product to be detected can be increased to the highest in a short time, and then the product is photographed, thereby ensuring that the brightness of the picture taken by the shooting assembly 11 is uniform, and further ensuring the detection efficiency.

[0086] The coaxial light source 121 and the plurality of bar light sources 122 are lighted at the same time to light the product to be detected, which further includes the following sub-steps:

[0087] The light emitted by the bar light source 122 and the coaxial light source 121 is blue bar light with a wavelength of 450nm, which is more conducive to highlighting defects and other features.

[0088] The number of bar light sources 122 is at least three, and the bar light sources 122 are connected end to end to form a ring and light the product to be detected, so that the product to be detected is illuminated by the bar light sources 122 around the product to be detected, avoiding the occurrence of dead angles, and the number of bar light sources 122 can be appropriately increased according to the needs, further avoiding the occurrence of dead angles affecting the detection quality.

[0089] Embodiment three

[0090] A detection method of an aluminum shell battery cell, comprising:

[0091] The battery cell 100 is placed in the detection station, and the surface to be detected of the battery cell 100 is perpendicular to the detection direction of the shooting assembly 11.

[0092] The light assembly 12 lights the surface to be detected of the battery cell 100 according to the combined light assembly method.

[0093] The shooting assembly 11 takes a picture of the surface to be detected of the battery cell 100 and uploads it to the computer for picture comparison to detect the quality of the battery cell 100.

[0094] In summary: By using a combination of bar light sources and coaxial light sources to illuminate the product inspection surface, the bar light sources that illuminate the product surface at an angle and the coaxial light sources that illuminate it vertically ensure that the product inspection surface is in a highly bright state when the imaging device is used to photograph the product inspection surface. This avoids the impact of changes in the intensity and orientation of external light on product inspection, thereby ensuring the efficiency and quality of the visual inspection device in inspecting appearance.

[0095] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A combined lighting method, characterized in that, The system includes a lighting assembly (12), which comprises a coaxial light source (121) and a plurality of strip light sources (122) surrounding the coaxial light source (121). The number of strip light sources (122) is at least three, and they are connected end to end, so that the plurality of strip light sources (122) form a ring. The system also includes the following steps: Based on the size and shape of the surface of the product to be photographed, the angles at which the multiple strip light sources face the product to be photographed are calculated; Each of the strip light sources (122) rotates along an adjustment slot on the mounting bracket to adjust to a calculated facing angle; wherein the angle adjustment range of each strip light source facing the product is between zero and ninety degrees; Fix the strip light source after the angle adjustment is completed; The coaxial light source (121) and the multiple strip light sources (122) are lit simultaneously in a brightening strobe manner to synchronously illuminate the surface of the product to be inspected; The shooting component (11) takes a picture of the surface of the product to be inspected after a delay of T2+T3; where T2 is the time when the shooting component (11) receives the trigger shooting command after the coaxial light source (121) and multiple strip light sources (122) are lit at the same time, and T2 is less than or equal to 50us; T3 is the preset delay shooting time after the shooting component (11) receives the trigger command, and T3 is less than or equal to 50us; the time interval between two trigger shootings shall not be less than 1.42ms.

2. The combined lighting method according to claim 1, characterized in that, A beam splitter (1211) is provided on one side of the coaxial light source (121) between the detection device and the product.

3. The combined lighting method according to claim 2, characterized in that, The beam splitter (1211) is tilted at a 45-degree angle relative to the shooting direction of the shooting component (11).

4. The combined lighting method according to claim 3, characterized in that, The coaxial light source (121) and the multiple strip light sources (122) are simultaneously illuminated to synchronously illuminate the surface of the product to be inspected, including the following sub-steps: Coaxial light source (121) provides lateral illumination; The beam splitter (1211) redirects the transverse light to obtain coaxial light; Coaxial light is used to illuminate the product inspection surface perpendicular to it.

5. The combined lighting method according to claim 1, characterized in that, The coaxial light source (121) and the multiple strip light sources (122) are simultaneously illuminated to synchronously illuminate the surface of the product to be inspected. The process also includes the following sub-steps: The light emitted by the bar light source (122) and the coaxial light source (121) is blue bar light with a wavelength of 450nm.

6. A method for testing aluminum-cased battery cells, characterized in that, include: Place the battery cell (100) at the testing station and make the surface of the battery cell (100) to be tested perpendicular to the testing direction of the imaging component (11); The lighting component (12) illuminates the surface of the battery cell (100) to be tested using the combined lighting method according to any one of claims 1-5; The imaging component (11) takes a picture of the surface of the battery cell (100) to be inspected and uploads it to a computer for image comparison to detect the quality of the battery cell (100).

Images