Battery detection system and method

Abstract

The invention discloses a battery detection system and method. The battery detection system comprises an acquisition device, a first light source, a second light source, a control device and a material belt, the material belt is used for driving a tested battery to move, and the tested battery comprises a pole piece and / or a diaphragm; the first light source, the second light source and the collecting device are located on one side of the material belt, and the first light source and the second light source form a first preset angle. The first light source and the second light source emit light in different colors; the control device is connected with the first light source, the second light source and the acquisition device; the control device is used for determining the collection frequency of the collection device according to the speed information of the material belt, controlling the first light source and the second light source to emit light according to the collection frequency, controlling the collection device to collect image information of the detected battery when the first light source and the second light source emit light, and determining whether the detected battery breaks down or not according to the image information. According to the technical scheme, the detection accuracy of the detected battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a battery detection system and method. Background Art

[0002] In the production process of lithium battery thermal composite stacks (including pole pieces and diaphragms), incoming material inspection is an indispensable part of the production process. During the production process, the reliability of this function's inspection directly affects the yield of subsequent products.

[0003] The existing detection of pole pieces and diaphragms is to illuminate the pole pieces and diaphragms with a light source, and then use a line scan camera to scan the pole pieces and diaphragms to obtain images of the pole pieces and diaphragms, and then judge whether there are defects in the pole pieces and diaphragms or whether there are foreign objects on the surface based on the images. However, the light source used generally emits a single type of light, such as white light, so that the image generated by the line scan camera cannot identify a variety of different foreign objects, and thus cannot accurately detect whether the thermal composite stack of the lithium battery is abnormal, that is, it cannot accurately detect whether the battery is abnormal. Summary of the invention

[0004] The present invention provides a battery detection system and method to solve the problem of being unable to accurately detect whether a battery is abnormal.

[0005] According to one aspect of the present invention, a battery detection system is provided, the battery detection system comprising: a collection device, a first light source, a second light source, a control device and a material belt;

[0006] The material belt is provided with a battery to be tested, and the material belt is used to drive the battery to be tested to move, and the battery to be tested includes a pole piece and / or a diaphragm;

[0007] The first light source, the second light source and the collection device are located on one side of the material strip, and the first light source and the second light source form a first preset angle; the first light source and the second light source have different luminous colors;

[0008] The control device is connected to the first light source, the second light source and the acquisition device respectively; the control device is used to determine the acquisition frequency of the acquisition device according to the speed information of the material belt, and control the first light source and the second light source to emit light respectively according to the acquisition frequency, control the acquisition device to collect image information of the battery under test when the first light source and the second light source emit light respectively, and determine whether the battery under test is faulty according to the image information.

[0009] Optionally, the light emission color of the first light source is complementary to the color of the first faulty object, and the light emission color of the second light source is the same as the color of the first faulty object;

[0010] The control device is used to control the first light source to turn on, control the acquisition device to acquire a first partial image of the battery under test, and then control the first light source to turn off, control the second light source to turn on, and control the acquisition device to acquire a second partial image of the battery under test when the battery under test is in the detection area in a cyclic manner according to the acquisition frequency; and determine the first image information of the battery under test based on multiple first partial images, determine the second image information of the battery under test based on multiple second partial images, determine whether the battery under test is faulty based on the first image information and the second image information, and determine the fault type of the battery under test when the battery under test is faulty.

[0011] Optionally, the acquisition device includes a first acquisition module and a second acquisition module; the first image information includes first sub-image information and second sub-image information, and the second image information includes third sub-image information and fourth sub-image information;

[0012] The distance between the first acquisition module and the material belt is the same as the distance between the second acquisition module and the material belt; the first acquisition module and the second acquisition module form a second preset angle;

[0013] The control device is used to control the first light source to turn on, control the first acquisition module to acquire the first sub-portion image of the battery under test, control the second acquisition module to acquire the second sub-portion image of the battery under test, and then control the first light source to turn off, control the second light source to turn on, control the first acquisition module to acquire the third sub-portion image of the battery under test, and control the second acquisition module to acquire the fourth sub-portion image of the battery under test when the battery under test is in the detection area; and determine the first sub-portion image information of the battery under test according to multiple first sub-portion images, determine the second sub-portion image information of the battery under test according to multiple second sub-portion images, determine the third sub-portion image information of the battery under test according to multiple third sub-portion images, determine the fourth sub-portion image information of the battery under test according to multiple fourth sub-portion images, determine whether the battery under test is faulty according to the first sub-portion information, the second sub-portion image information, the third sub-portion image information and the fourth sub-portion image information, and determine the fault type of the battery under test when the battery under test is faulty.

[0014] Optionally, the first acquisition module includes a first line scan camera, and the second acquisition module includes a second line scan camera.

[0015] Optionally, the battery detection system further includes an encoding device, which is located on a side of the material belt away from the first light source; the encoding device is connected to the control device; the encoding device is used to detect speed information of the material belt and send the speed information to the control device.

[0016] Optionally, the encoding device includes an encoder, an encoding wheel, a spring, a first connecting plate and a second connecting plate;

[0017] The encoding wheel comprises a bearing and an outer wheel, the outer wheel is in contact with the material strip, the bearing is connected to the first end of the first connecting plate, the second end of the first connecting plate is connected to the first end of the second connecting plate, the second end of the second connecting plate is connected to the first end of the spring, and the second end of the spring is connected to the first connecting plate;

[0018] The encoder is coaxially connected to the encoding wheel, the encoder is connected to the control device, and the encoder is used to determine the speed information of the material belt according to the rotation speed of the encoding wheel.

[0019] Optionally, the control device is used to process the first sub-image information, the second sub-image information, the third sub-image information and the fourth sub-image information according to a binocular detection algorithm to determine whether the battery under test is faulty, and when the battery under test is faulty, determine the fault type of the battery under test.

[0020] Optionally, the battery detection system further comprises a line sweeping roller, the line sweeping roller is located at a side of the material belt away from the first light source, and the line sweeping roller is used to drive the material belt to move;

[0021] The battery detection system further comprises an auxiliary roller, wherein the auxiliary roller is located on the material belt and is used to control the transmission direction of the material belt.

[0022] According to another aspect of the present invention, a battery detection method is provided. The battery detection method is implemented by the battery detection system according to any embodiment of the present invention. The battery detection method includes:

[0023] The material belt drives the battery under test to move; wherein the battery under test includes a pole piece and / or a diaphragm;

[0024] The control device determines the acquisition frequency of the acquisition device according to the speed information of the material belt, and controls the first light source and the second light source to emit light respectively according to the acquisition frequency, controls the acquisition device to collect image information of the battery under test when the first light source and the second light source emit light respectively, and determines whether the battery under test is faulty according to the image information.

[0025] Optionally, the light emission color of the first light source is complementary to the color of the first faulty object, and the light emission color of the second light source is the same as the color of the first faulty object;

[0026] The control device controls the first light source and the second light source to emit light respectively according to the acquisition frequency, controls the acquisition device to acquire image information of the battery under test when the first light source and the second light source emit light respectively, and determines whether the battery under test is faulty according to the image information, including:

[0027] When the battery under test is in the detection area, the control device controls the first light source to be turned on according to the acquisition frequency cycle, and controls the acquisition device to acquire a first partial image of the battery under test;

[0028] The control device controls the first light source to be turned off, controls the second light source to be turned on, and controls the acquisition device to acquire a second partial image of the tested battery;

[0029] The control device determines the first image information of the battery under test based on multiple first partial images, determines the second image information of the battery under test based on multiple second partial images, determines whether the battery under test is faulty based on the first image information and the second image information, and determines the fault type of the battery under test when the battery under test is faulty.

[0030] The technical solution of the embodiment of the present invention is to set a first light source and a second light source, and the first light source and the second light source have different luminous colors. The acquisition device can collect multiple images under the irradiation of the first light source, and the control device obtains the image information corresponding to the first light source after splicing. The acquisition device can collect multiple images under the irradiation of the second light source, and the control device obtains the image information corresponding to the second light source after splicing. Therefore, by comparing the image information corresponding to the first light source and the image information corresponding to the second light source, the type of foreign matter on the surface of the tested battery can be determined. In this way, it is possible to accurately detect whether there are foreign matter or defects on the surface of the tested battery, and when there are foreign matter, the type of foreign matter on the surface of the tested battery can be accurately determined, so as to accurately determine whether the tested battery is faulty. Thereby, it is possible to avoid the problem that the light is easily absorbed by the foreign matter when irradiated by a light source, so that the collected image cannot accurately identify the foreign matter.

[0031] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 is a structural schematic diagram of a battery detection system provided by an embodiment of the present invention;

[0034] Figure 2 is a structural schematic diagram of another battery detection system provided by an embodiment of the present invention;

[0035] Figure 3 is a structural schematic diagram of another battery detection system provided by an embodiment of the present invention;

[0036] Figure 4 yes Figure 3 A partial enlarged view of

[0037] Figure 5 is a structural schematic diagram of another battery detection system provided by an embodiment of the present invention;

[0038] Figure 6 is a flow chart of a battery detection method provided by an embodiment of the present invention;

[0039] Figure 7 This is a flow chart of another battery detection method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] An embodiment of the present invention provides a battery detection system. Figure 1 is a schematic diagram of a battery detection system provided by an embodiment of the present invention, with reference to Figure 1 , the battery detection system includes: a collection device 110, a first light source 120, a second light source 130, a control device 140 and a material belt 150;

[0043] The material belt 150 is provided with a battery under test, and the material belt 150 is used to drive the battery under test 200 to move, and the battery under test 200 includes a pole piece and / or a diaphragm;

[0044] The first light source 120, the second light source 130 and the collection device 110 are located on one side of the material strip 150, and the first light source 120 and the second light source 130 form a first preset angle; the first light source 120 and the second light source 130 emit light of different colors;

[0045] The control device 140 is connected to the first light source 120, the second light source 130 and the collection device 110 respectively; the control device 140 is used to determine the collection frequency of the collection device 110 according to the speed information of the material belt 150, and control the first light source 120 and the second light source 130 to emit light respectively according to the collection frequency, control the collection device 110 to collect image information of the battery under test 200 when the first light source 120 and the second light source 130 emit light respectively, and determine whether the battery under test 200 is faulty according to the image information.

[0046] Among them, the acquisition device 110 can perform image acquisition, for example, the acquisition device 110 includes at least one camera. The battery 200 under test can be a lithium battery or a part of a lithium battery. The battery 200 under test includes a pole piece and / or a diaphragm, and the pole piece is an electrode piece, which can include a positive electrode and a negative electrode. When the battery 200 under test includes a pole piece and a diaphragm, that is, a composite laminate of a pole piece and a diaphragm, the diaphragm can be located between two pole pieces. The diaphragm may include a semiconductor material. The battery 200 under test is arranged on the material belt 150, so that the material belt 150 can drive the battery 200 under test to move.

[0047] The first light source 120, the second light source 130 and the acquisition device 110 are located on the material belt 150 and are at a certain distance from the material belt 150. The material belt 150 drives the battery 200 to move. When the battery 200 moves to the detection area (photographing area), the acquisition device 110 can acquire images of the battery 200 for multiple times. The multiple images acquired by each acquisition device are spliced ​​to obtain image information of the battery 200. Based on the image information of the battery 200, it can be determined whether there are defects (such as protrusions or pits) on the surface of the battery 200, and it can also be determined whether there are foreign objects (dust, etc.) on the surface of the battery 200, so as to determine whether the battery 200 is faulty.

[0048] The control device 140 may include a programmable logic controller (PLC) and / or an industrial computer. For example, if the control device 140 includes a PLC and an industrial computer, the speed information of the material belt 150 may be obtained by the PLC, and the industrial computer determines the acquisition frequency of the acquisition device 110 according to the speed information of the material belt 150, and controls the first light source 120 and the second light source 130 to emit light respectively according to the acquisition frequency, controls the acquisition device 110 to collect image information of the tested battery 200 when the first light source 120 and the second light source 130 emit light respectively, and determines whether the tested battery 200 is faulty according to the image information. This embodiment is not limited.

[0049] The control device 140 determines the acquisition frequency of the acquisition device 110 according to the speed information of the material belt 150, and controls the first light source 120 and the second light source 130 to emit light respectively according to the acquisition frequency, and controls the acquisition device 110 to acquire image information according to the acquisition frequency, so that the acquisition frequency matches the speed of the material belt 150, that is, the acquisition frequency matches the speed of the battery 200 under test. When the speed of the battery 200 under test is faster, the acquisition frequency is higher, and when the speed of the battery 200 under test is slower, the acquisition frequency is lower, so that when the battery 200 under test is in the photographing area, the acquisition device 110 acquires image information of the battery 200 under test multiple times, and a complete image of the battery 200 under test can be obtained through stitching.

[0050] Specifically, by setting the first light source 120 and the second light source 130, the first light source 120 and the second light source 130 have different luminous colors, so that when a foreign matter on the surface of the tested battery 200 absorbs the light of the first light source 120 and cannot be displayed in the image, it can be formed in the image corresponding to the second light source 130 under the irradiation of the second light source 130. The acquisition device 110 can collect multiple images under the irradiation of the first light source 120, and the control device 140 obtains the image information corresponding to the first light source 120 after splicing. The acquisition device 110 can collect multiple images under the irradiation of the second light source 130, and the control device 140 obtains the image information corresponding to the second light source 130 after splicing. Therefore, by comparing the image information corresponding to the first light source 120 and the image information corresponding to the second light source 130, the type of foreign matter on the surface of the tested battery 200 can be determined. In this way, it is possible to accurately detect whether there are foreign matter or defects on the surface of the tested battery 200, and when there are foreign matter, the type of foreign matter on the surface of the tested battery 200 can be accurately determined, so that it can be accurately determined whether the tested battery 200 is faulty. This can avoid the problem that the light from a light source is easily absorbed by foreign matter, making it impossible to accurately identify the foreign matter from the collected image. In this way, the fault of the battery 200 under test can be traced to the source, which is convenient for improving the preparation of the battery 200 under test.

[0051] The first light source 120 and the second light source 130 form a first preset angle, which can be determined according to the irradiation area of ​​the first light source 120 and the second light source 130, and is not limited in this embodiment. By setting the first light source 120 and the second light source 130 to form a preset angle, the two light sources can be prevented from interfering with each other, further improving the accuracy of the collected image, and thus improving the accuracy of the detection of the battery 200 under test.

[0052] The technical solution of this embodiment is to set a first light source and a second light source, and the first light source and the second light source have different luminous colors. The acquisition device can collect multiple images under the irradiation of the first light source, and the control device obtains the image information corresponding to the first light source after splicing. The acquisition device can collect multiple images under the irradiation of the second light source, and the control device obtains the image information corresponding to the second light source after splicing. Therefore, by comparing the image information corresponding to the first light source and the image information corresponding to the second light source, the type of foreign matter on the surface of the tested battery can be determined. In this way, it is possible to accurately detect whether there are foreign matter or defects on the surface of the tested battery, and when there are foreign matter, the type of foreign matter on the surface of the tested battery can be accurately determined, so as to accurately determine whether the tested battery is faulty. Thereby, it is possible to avoid the problem that the light is easily absorbed by foreign matter when irradiated by a light source, so that the collected image cannot accurately identify the foreign matter.

[0053] On the basis of the above technical solution, optionally, the luminous color of the first light source 120 is complementary to the color of the first faulty object, and the luminous color of the second light source 130 is the same as the color of the first faulty object;

[0054] The control device 140 is used to control the first light source 120 to turn on according to the acquisition frequency cycle, control the acquisition device 110 to collect the first partial image of the battery 200 under test, and then control the first light source 120 to turn off, control the second light source 130 to turn on, and control the acquisition device 110 to collect the second partial image of the battery 200 under test when the battery 200 under test is in the detection area; and determine the first image information of the battery under test based on multiple first partial images, determine the second image information of the battery under test 200 based on multiple second partial images, determine whether the battery under test 200 is faulty based on the first image information and the second image information, and determine the fault type of the battery under test 200 when the battery under test 200 is faulty.

[0055] For example, if the first fault object is copper powder, the color of the first fault object is yellow, and the luminous color of the first light source 120 is a complementary color to the color of the first fault object, then the luminous color of the first light source 120 is blue, and the luminous color of the second light source 130 is yellow. When there is a first fault object on the battery 200 under test, under the irradiation of the first light source 120, the image collected by the acquisition device 110 shows that the first fault object is white, and under the irradiation of the second light source 130, the image collected by the acquisition device 110 shows that the first fault object is black. By comparing the image corresponding to the first light source 120 with the image corresponding to the second light source 130, it can be determined whether there is a fault object on the battery 200 under test, that is, whether the battery 200 under test is faulty. This can avoid the problem that the light is easily absorbed by foreign matter (faulty object) when irradiated by a light source, so that the collected image cannot accurately identify the foreign matter.

[0056] There may also be a second fault object on the tested battery 200. For example, if the color of the second fault object is white or close to white, then when white foreign matter exists in both the image corresponding to the first light source 120 and the image corresponding to the second light source 130, it indicates that there is foreign matter on the surface of the tested battery 200, that is, there is a fault in the tested battery 200. The second fault object may be aluminum powder and / or iron powder.

[0057] Specifically, the control device 140 can determine whether the tested battery 200 is in the detection area according to the speed information of the material belt 150 and the running time of the tested battery 200. When the tested battery 200 enters the detection area, the control device 140 controls the first light source 120 to turn on according to the acquisition frequency, controls the acquisition device 110 to collect the first part of the image of the tested battery 200, and then controls the first light source 120 to turn off, controls the second light source 130 to turn on, and controls the acquisition device 110 to collect the second part of the image of the tested battery 200, until the tested battery 200 leaves the detection area. The detection area is the photographing area where the acquisition device 100 can perform image acquisition.

[0058] Then, the control device 140 determines the first image information of the tested battery 200 based on the multiple first partial images, and obtains the complete image of the tested battery 200 corresponding to the first light source 120. The control device 140 determines the second image information of the tested battery 200 based on the multiple second partial images, and obtains the complete image of the tested battery 200 corresponding to the second light source 130. The control device 140 compares the first image information and the second image information to determine whether the tested battery 200 is faulty.

[0059] Based on the above technical solutions, Figure 2 is a structural diagram of another battery detection system provided by an embodiment of the present invention. Optionally, refer to Figure 2 , the acquisition device 110 includes a first acquisition module 111 and a second acquisition module 112; the first image information includes first sub-image information and second sub-image information, and the second image information includes third sub-image information and fourth sub-image information;

[0060] The distance between the first acquisition module 111 and the material belt 150 is the same as the distance between the second acquisition module 112 and the material belt 150; the first acquisition module 111 and the second acquisition module 112 form a second preset angle;

[0061] The control device 140 is used to control the first light source 120 to turn on, control the first acquisition module 111 to acquire the first sub-portion image of the battery under test, control the second acquisition module 112 to acquire the second sub-portion image of the battery under test, and then control the first light source to turn off, control the second light source to turn on, control the first acquisition module 111 to acquire the third sub-portion image of the battery under test, and control the second acquisition module 112 to acquire the fourth sub-portion image of the battery under test when the battery under test 200 is in the detection area; and determine the first sub-image information of the battery under test according to the multiple first sub-portion images, determine the second sub-image information of the battery under test according to the multiple second sub-portion images, determine the third sub-image information of the battery under test according to the multiple third sub-portion images, determine the fourth sub-image information of the battery under test according to the multiple fourth sub-portion images, determine whether the battery under test is faulty according to the first sub-image information, the second sub-image information, the third sub-image information and the fourth sub-image information, and determine the fault type of the battery under test when the battery under test is faulty.

[0062] Specifically, by setting the first acquisition module 111 and the second acquisition module 112, the first acquisition module 111 and the second acquisition module 112 form a second preset angle, so that the image information of the battery 200 under test can be collected from different angles. When the first light source 120 emits light, the first acquisition module 111 and the second acquisition module 112 respectively collect images, and when the second light source 130 emits light, the first acquisition module 111 and the second acquisition module 112 respectively collect images. All the first sub-part images collected by the first acquisition module 111 under the first light source 120 are spliced ​​to obtain the first sub-image information corresponding to the first acquisition module 111 under the first light source 120; all the second sub-part images collected by the second acquisition module 112 under the first light source 120 are spliced ​​to obtain the second sub-image information corresponding to the second acquisition module 112 under the second light source. The control device 140 can process the first sub-image information and the second sub-image information to obtain the first image information, determine whether there are defects or foreign matter on the surface of the battery 200 under test, and can determine the depth information of the defects. Similarly, the control device 140 can process the third sub-image information and the fourth sub-image information to obtain the second image information, determine whether there are defects or foreign objects on the surface of the tested battery 200, and determine the depth information of the defects. In addition, the control device 140 can determine the type of foreign objects (fault objects) on the surface of the tested battery 200 based on the first image information and the second image information.

[0063] In addition, the control device 140 can count the number of various types of faulty objects and display them in the form of a graph or a table, so as to facilitate the improvement of the preparation of the tested battery 200 according to the fault problem.

[0064] Optionally, the first acquisition module 111 includes a first line scan camera, and the second acquisition module 112 includes a second line scan camera.

[0065] Specifically, a line scan camera is a high-precision imaging device designed specifically for capturing one-dimensional image data. The line scan camera captures a line of images each time through a linear array sensor, and then merges them into a two-dimensional image to obtain a complete image of the object under test. Therefore, by setting the first acquisition module 111 to include a first line scan camera and the second acquisition module 112 to include a second line scan camera, a complete image of the battery under test 200 can be acquired, so that the battery under test 200 can be inspected to determine whether there are defects or faults on the surface of the battery under test 200, that is, to determine whether the battery under test 200 is faulty.

[0066] On the basis of the above technical solutions, Figure 3 is a structural diagram of another battery detection system provided by an embodiment of the present invention. Optionally, refer to Figure 3 The battery detection system also includes an encoding device 160, which is located on the side of the material belt 150 away from the first light source 120; the encoding device 160 is connected to the control device; the encoding device 160 is used to detect the speed information of the material belt 150 and send the speed information to the control device 140.

[0067] Specifically, by setting up the encoding device 160, the encoding device 160 is in contact with the material belt 150, so that the speed information of the material belt 150 can be detected, and the speed information is sent to the control device 140, so that the control device 140 determines the acquisition frequency of the acquisition device 110 according to the speed information of the material belt, so that the acquisition frequency of the acquisition device 110 matches the speed of the material belt 150, thereby ensuring that the image information of the battery 200 under test can be collected multiple times, and then the complete image of the battery 200 under test is obtained.

[0068] Figure 4 yes Figure 3 , optionally, refer to Figure 4 , the encoding device 160 includes an encoder, an encoding wheel 161, a spring 162, a first connecting plate 163 and a second connecting plate 164;

[0069] The encoder wheel 161 includes a bearing 1611 and an outer wheel 1612, the outer wheel 1612 is in contact with the material belt 150, the bearing 1611 is connected to the first end of the first connecting plate 163, the second end of the first connecting plate 163 is connected to the first end of the second connecting plate 164, the second end of the second connecting plate 164 is connected to the first end of the spring 162, and the second end of the spring 162 is connected to the first connecting plate 163;

[0070] The encoder is coaxially connected to the encoder wheel 161 , and the encoder is connected to the control device 140 . The encoder is used to determine the speed information of the material belt 150 according to the rotation speed of the encoder wheel 161 .

[0071] The first connecting plate 163 may be provided with a first pillar 1631 and a second pillar 1632, and the second connecting plate 164 may be fixed on the first pillar 1631. The second connecting plate 164 may be provided with a third pillar 1641, the first end of the spring 162 is fixed on the third pillar 1641, and the second end of the spring 162 is fixed on the second pillar 1632. The spring 162 provides a preload force, thereby pressing the encoder wheel 161 against the material belt 150, ensuring that the encoder wheel 161 rotates as the material belt 150 moves.

[0072] Specifically, the encoder wheel 161 contacts the material belt 150 and converts the speed of the material belt 150 into the rotation speed of the encoder wheel 161. The encoder is coaxially connected to the encoder wheel 161, and the encoder can be arranged on the side of the bearing 1611 away from the first connecting plate 163, so that the encoder can rotate together with the encoder wheel 161, so that the speed information output by the encoder is the speed information of the material belt 150.

[0073] On the basis of the above-mentioned technical solutions, optionally, the control device 140 is used to process the first sub-image information, the second sub-image information, the third sub-image information and the fourth sub-image information according to the binocular detection algorithm to determine whether the battery 200 under test is faulty, and when the battery 200 under test is faulty, determine the fault type of the battery 200 under test.

[0074] Specifically, the control device 140 can use a binocular detection algorithm to process the first sub-image information and the second sub-image information to obtain the first image information, determine whether there are defects or foreign matter on the surface of the battery 200 under test, and determine the depth information of the defects. Similarly, the control device 140 can use a binocular detection algorithm to process the third sub-image information and the fourth sub-image information to obtain the second image information, determine whether there are defects or foreign matter on the surface of the battery 200 under test, and determine the depth information of the defects. In addition, the control device 140 can determine the type of foreign matter (faulty object) on the surface of the battery 200 under test based on the first image information and the second image information, that is, it can determine whether the battery 200 under test is faulty, and when the battery 200 under test is faulty, determine the fault type of the battery 200 under test.

[0075] On the basis of the above technical solutions, Figure 5 is a structural diagram of another battery detection system provided by an embodiment of the present invention. Optionally, refer to Figure 3 or Figure 5The battery detection system further includes a line sweep roller 170, which is located on a side of the material belt 150 away from the first light source 120, and the line sweep roller 170 is used to drive the material belt 150 to move;

[0076] The battery detection system further includes an auxiliary roller 180 . The auxiliary roller 180 is located on the material belt and is used to control the transmission direction of the material belt 150 .

[0077] Specifically, the line scanning roller 170 can roll, thereby driving the material belt 150 to rotate, and then driving the tested battery 200 to move, so that the acquisition device 110 can collect images of different parts of the tested battery 200 at different times, and all images can be spliced ​​to form a complete image of the tested battery 200, so as to detect the tested battery 200. The auxiliary roller 180 can change the direction of the material belt 150, so that the material belt 150 enters and exits the line scanning roller at a certain feeding and discharging angle, and can ensure the stability of the material belt 150 during detection, so as to accurately collect image information of the tested battery 200.

[0078] It should be noted that Figure 5 The structure of the encoding device 160 is only illustrated in FIG. 1 , and the specific structure of the encoding device 160 is not limited. The specific structure of the encoding device 160 can be referred to Figure 4 .

[0079] An embodiment of the present invention further provides a battery detection method, which is implemented by the battery detection system provided by any embodiment of the present invention. Figure 6 is a flow chart of a battery detection method provided by an embodiment of the present invention, refer to Figure 6 , battery detection methods include:

[0080] S101. The material belt drives the battery under test to move; wherein the battery under test includes a pole piece and / or a diaphragm.

[0081] Specifically, the material belt 150 drives the battery 200 under test to move. When the battery 200 under test moves to the detection area (photographing area), the acquisition device 110 can acquire images of the battery 200 under test multiple times. By splicing the multiple images acquired by each acquisition device, the image information of the battery 200 under test can be obtained, thereby detecting the battery 200 under test.

[0082] S102, the control device determines the acquisition frequency of the acquisition device according to the speed information of the material belt, and controls the first light source and the second light source to emit light respectively according to the acquisition frequency, controls the acquisition device to collect image information of the battery under test when the first light source and the second light source emit light respectively, and determines whether the battery under test is faulty according to the image information.

[0083] Among them, the control device 140 determines the acquisition frequency of the acquisition device 110 according to the speed information of the material belt 150, and controls the first light source 120 and the second light source 130 to emit light respectively according to the acquisition frequency, and controls the acquisition device 110 to acquire image information according to the acquisition frequency, so that the acquisition frequency matches the speed of the material belt 150, that is, the acquisition frequency matches the speed of the battery 200 under test. When the speed of the battery 200 under test is faster, the acquisition frequency is higher, and when the speed of the battery 200 under test is slower, the acquisition frequency is lower, so that when the battery 200 under test is in the photographing area, the acquisition device 110 acquires image information of the battery 200 under test multiple times, and a complete image of the battery 200 under test can be obtained through splicing.

[0084] Specifically, by setting the first light source 120 and the second light source 130, the first light source 120 and the second light source 130 have different luminous colors, so that when a foreign matter on the surface of the tested battery 200 absorbs the light of the first light source 120 and cannot be displayed in the image, it can be formed in the image corresponding to the second light source 130 under the irradiation of the second light source 130. The acquisition device 110 can collect multiple images under the irradiation of the first light source 120, and the control device 140 obtains the image information corresponding to the first light source 120 after splicing. The acquisition device 110 can collect multiple images under the irradiation of the second light source 130, and the control device 140 obtains the image information corresponding to the second light source 130 after splicing. Therefore, by comparing the image information corresponding to the first light source 120 and the image information corresponding to the second light source 130, the type of foreign matter on the surface of the tested battery 200 can be determined. In this way, it is possible to accurately detect whether there are foreign matter or defects on the surface of the tested battery 200, and when there are foreign matter, the type of foreign matter on the surface of the tested battery 200 can be accurately determined, so that it can be accurately determined whether the tested battery 200 is faulty. This can avoid the problem that the light from a light source is easily absorbed by the foreign matter, making it impossible to accurately identify the foreign matter from the collected image.

[0085] Based on the above technical solutions, Figure 7 is a flowchart of another battery detection method provided by an embodiment of the present invention. Optionally, refer to Figure 7 , battery detection methods include:

[0086] S201. The material belt drives the battery under test to move; wherein the battery under test includes a pole piece and / or a diaphragm.

[0087] S202: The control device determines the collection frequency of the collection device according to the speed information of the material belt.

[0088] S203, determining whether the tested battery is in the detection area, if so, executing step S204; if not, executing step S206.

[0089] Specifically, the control device 140 can determine whether the tested battery 200 is in the detection area according to the speed information of the material belt 150 and the running time of the tested battery 200. When the tested battery 200 enters the detection area, the control device 140 controls the first light source 120 and the second light source 130 to be turned on respectively, and controls the acquisition device 140 to acquire an image of the tested battery 200.

[0090] S204: The control device controls the first light source to turn on according to the acquisition frequency, and controls the acquisition device to acquire a first portion of the image of the tested battery.

[0091] Specifically, when the battery 200 under test enters the detection area, the control device 140 controls the first light source 120 to turn on according to the acquisition frequency cycle, and controls the acquisition device 110 to acquire the first partial image of the battery 200 under test, that is, acquires a partial image of the battery 200 under test under the illumination of the first light source 120.

[0092] S205, the control device controls the first light source to turn off, controls the second light source to turn on, and controls the acquisition device to acquire a second portion of the image of the tested battery; and returns to step S203.

[0093] Specifically, the control device 140 controls the first light source 120 to turn off, controls the second light source 130 to turn on, and controls the acquisition device 110 to acquire a second partial image of the tested battery 200 , that is, to acquire a partial image of the tested battery 200 under the illumination of the second light source 120 .

[0094] This cycle is repeated until the battery 200 under test leaves the detection area.

[0095] S206. The control device determines first image information of the battery under test according to the multiple first partial images, determines second image information of the battery under test according to the multiple second partial images, determines whether the battery under test is faulty according to the first image information and the second image information, and determines the fault type of the battery under test when the battery under test is faulty.

[0096] Specifically, the control device 140 determines the first image information of the battery 200 under test according to the multiple first partial images, and can obtain the complete image of the battery 200 under test corresponding to the first light source 120. The control device 140 determines the second image information of the battery 200 under test according to the multiple second partial images, and can obtain the complete image of the battery 200 under test corresponding to the second light source 130. The control device 140 compares the first image information and the second image information to determine whether the battery 200 under test is faulty.

[0097] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0098] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery detection system, characterized in that: include: A collection device, a first light source, a second light source, a control device and a material belt; The material belt is provided with a battery to be tested, and the material belt is used to drive the battery to be tested to move, and the battery to be tested includes a pole piece and / or a diaphragm; The first light source, the second light source and the collection device are located on one side of the material strip, and the first light source and the second light source form a first preset angle; the first light source and the second light source have different luminous colors; The control device is connected to the first light source, the second light source and the collection device respectively; The control device is used to determine the acquisition frequency of the acquisition device according to the speed information of the material belt, and control the first light source and the second light source to emit light respectively according to the acquisition frequency, control the acquisition device to collect image information of the battery under test when the first light source and the second light source emit light respectively, and determine whether the battery under test is faulty according to the image information.

2. The battery detection system according to claim 1, characterized in that: The light color of the first light source is complementary to the color of the first faulty object, and the light color of the second light source is the same as the color of the first faulty object; The control device is used to control the first light source to turn on, control the acquisition device to acquire a first partial image of the battery under test, and then control the first light source to turn off, control the second light source to turn on, and control the acquisition device to acquire a second partial image of the battery under test, when the battery under test is in the detection area, cyclically according to the acquisition frequency; And determine the first image information of the battery under test based on multiple first partial images, determine the second image information of the battery under test based on multiple second partial images, determine whether the battery under test is faulty based on the first image information and the second image information, and when the battery under test is faulty, determine the fault type of the battery under test.

3. The battery detection system according to claim 2, characterized in that: The acquisition device includes a first acquisition module and a second acquisition module; the first image information includes first sub-image information and second sub-image information, and the second image information includes third sub-image information and fourth sub-image information; The distance between the first acquisition module and the material belt is the same as the distance between the second acquisition module and the material belt; the first acquisition module and the second acquisition module form a second preset angle; The control device is used to control the first light source to turn on, control the first acquisition module to acquire a first sub-portion image of the battery under test, control the second acquisition module to acquire a second sub-portion image of the battery under test, and then control the first light source to turn off, control the second light source to turn on, control the first acquisition module to acquire a third sub-portion image of the battery under test, and control the second acquisition module to acquire a fourth sub-portion image of the battery under test, when the battery under test is in the detection area. And determine the first sub-image information of the battery under test based on the multiple first sub-part images, determine the second sub-image information of the battery under test based on the multiple second sub-part images, determine the third sub-image information of the battery under test based on the multiple third sub-part images, determine the fourth sub-image information of the battery under test based on the multiple fourth sub-part images, determine whether the battery under test is faulty based on the first sub-image information, the second sub-image information, the third sub-image information and the fourth sub-image information, and when the battery under test is faulty, determine the fault type of the battery under test.

4. The battery detection system according to claim 3, characterized in that: The first acquisition module includes a first line scan camera, and the second acquisition module includes a second line scan camera.

5. The battery detection system according to any one of claims 1 to 4, characterized in that: The battery detection system also includes an encoding device, which is located on the side of the material belt away from the first light source; the encoding device is connected to the control device; the encoding device is used to detect speed information of the material belt and send the speed information to the control device.

6. The battery detection system according to claim 5, characterized in that: The encoding device includes an encoder, an encoding wheel, a spring, a first connecting plate and a second connecting plate; The encoding wheel comprises a bearing and an outer wheel, the outer wheel is in contact with the material strip, the bearing is connected to the first end of the first connecting plate, the second end of the first connecting plate is connected to the first end of the second connecting plate, the second end of the second connecting plate is connected to the first end of the spring, and the second end of the spring is connected to the first connecting plate; The encoder is coaxially connected to the encoding wheel, the encoder is connected to the control device, and the encoder is used to determine the speed information of the material belt according to the rotation speed of the encoding wheel.

7. The battery detection system according to claim 3, characterized in that: The control device is used to process the first sub-image information, the second sub-image information, the third sub-image information and the fourth sub-image information according to a binocular detection algorithm to determine whether the battery under test is faulty, and when the battery under test is faulty, determine the fault type of the battery under test.

8. The battery detection system according to claim 1, characterized in that: The battery detection system further includes a line sweeping roller, which is located on a side of the material belt away from the first light source, and is used to drive the material belt to move; The battery detection system further comprises an auxiliary roller, wherein the auxiliary roller is located on the material belt and is used to control the transmission direction of the material belt.

9. A battery detection method, characterized in that: The battery detection method is implemented by the battery detection system according to any one of claims 1 to 8, and the battery detection method includes: The material belt drives the battery under test to move; wherein the battery under test includes a pole piece and / or a diaphragm; The control device determines the acquisition frequency of the acquisition device according to the speed information of the material belt, and controls the first light source and the second light source to emit light respectively according to the acquisition frequency, controls the acquisition device to collect image information of the battery under test when the first light source and the second light source emit light respectively, and determines whether the battery under test is faulty according to the image information.

10. The battery detection method according to claim 9, characterized in that: The light color of the first light source is complementary to the color of the first faulty object, and the light color of the second light source is the same as the color of the first faulty object; The control device controls the first light source and the second light source to emit light respectively according to the acquisition frequency, controls the acquisition device to acquire image information of the battery under test when the first light source and the second light source emit light respectively, and determines whether the battery under test is faulty according to the image information, including: When the battery under test is in the detection area, the control device controls the first light source to be turned on according to the acquisition frequency cycle, and controls the acquisition device to acquire a first partial image of the battery under test; The control device controls the first light source to be turned off, controls the second light source to be turned on, and controls the acquisition device to acquire a second partial image of the tested battery; The control device determines the first image information of the battery under test based on multiple first partial images, determines the second image information of the battery under test based on multiple second partial images, determines whether the battery under test is faulty based on the first image information and the second image information, and determines the fault type of the battery under test when the battery under test is faulty.

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