Battery ion precipitation detection method and detection device

Abstract

The invention provides a battery ion precipitation detection method and a battery ion precipitation detection device. The battery ion precipitation detection method comprises the following steps: disassembling a pole piece of a battery and unfolding the pole piece; acquiring an image of the surface of the pole piece; the image is processed, and the area proportion A of the ion precipitation area in the image is obtained. Through the scheme, the battery ion precipitation detection method can detect the area proportion A of the ion precipitation region of the pole piece in the battery, so that the ion precipitation condition of the pole piece in the battery can be detected, and people can conveniently master the ion precipitation condition in the battery.

Description

Technical Field

[0001] This application relates to the technical field of battery detection, and particularly relates to a method and device for detecting ion precipitation in a battery. Background Art

[0002] Batteries have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation means, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, and electric tools, etc.

[0003] Ion precipitation in a battery refers to the phenomenon that metals precipitate on the surface of the electrode plate when the battery is charged and discharged in a low-temperature environment for a long time. The whole process is irreversible, which will not only damage the battery, but also pose a safety risk to the battery. How to detect the ion precipitation situation in the battery has attracted more and more attention from those skilled in the art. Summary of the Invention

[0004] In view of the above problems, this application provides a method and device for detecting ion precipitation in a battery. This method for detecting ion precipitation in a battery can detect the ion precipitation situation of the electrode plate in the battery.

[0005] In a first aspect, some embodiments of this application provide a method for detecting ion precipitation in a battery. This method for detecting ion precipitation in a battery includes the following steps: disassembling the electrode plate of the battery and unfolding the electrode plate; collecting an image of the surface of the electrode plate; processing the image to obtain the area ratio A of the ion precipitation area in the image.

[0006] Through the above solution, this method for detecting ion precipitation in a battery can detect the area ratio A of the ion precipitation area of the electrode plate in the battery, realize the detection of the ion precipitation situation of the electrode plate in the battery, and facilitate people to master the ion precipitation situation in the battery.

[0007] According to the method for detecting ion precipitation in a battery provided by some embodiments of this application, the method for detecting ion precipitation in a battery further includes: determining the ion precipitation situation. If A < Y1, where Y1 is a first preset ratio, it is determined that slight ion precipitation occurs in the battery; if Y1 ≤ A ≤ Y2, where Y2 is a second preset ratio and Y1 < Y2, it is determined that moderate ion precipitation occurs in the battery; if A > Y2, it is determined that severe ion precipitation occurs in the battery.

[0008] Through this step, if A < Y1, it can be determined that slight ion precipitation occurs in the battery. If Y1 ≤ A ≤ Y2, it can be determined that moderate ion precipitation occurs in the battery. If A > Y2, it can be determined that severe ion precipitation occurs in the battery. This step classifies the severity of ion precipitation in the battery, enabling people to directly know the severity of ion precipitation.

[0009] According to the battery ion precipitation detection method provided by some embodiments of the present application, the steps of processing the image include: performing AI recognition on the image to identify the precipitation area of ions in the image; calculating the area ratio A of the precipitation area of ions in the image. Through this step, it is possible to know the area ratio A of the precipitation area of ions in the image in the entire image, which is convenient for those skilled in the art to determine the ion precipitation situation.

[0010] According to the battery ion precipitation detection method provided by some embodiments of the present application, the steps of performing AI recognition on the image include: extracting the feature area in the image; comparing the feature area with the precipitation area of ions in the preset database. If the feature area matches the precipitation area in the preset database, the feature area is output as the recognition result. Through this step, the battery ion precipitation detection method can identify the precipitation area of ions in the image.

[0011] According to the battery ion precipitation detection method provided by some embodiments of the present application, the ions include at least one of sodium ions, lithium ions, magnesium ions, and calcium ions.

[0012] According to the battery ion precipitation detection method provided by some embodiments of the present application, the electrode plate includes at least two electrode plate sub-parts. The step of collecting the image of the surface of the electrode plate is to sequentially collect the images of the surfaces of at least two electrode plate sub-parts, so that the battery ion precipitation detection method can detect a larger area of the electrode plate step by step, and the battery ion precipitation detection method can detect the ion precipitation of a larger-sized battery.

[0013] In a second aspect, some embodiments of the present application provide a battery ion precipitation detection device. The battery ion precipitation detection device includes a camera and a processing unit. The camera is used to collect the image of the electrode plate of the battery, and the processing unit is communicatively connected to the camera. The processing unit is used to obtain the area ratio A of the precipitation area of ions in the image.

[0014] Through the above structure, the battery ion precipitation detection device can detect the area ratio A of the precipitation area of ions in the electrode plate of the battery, realize the detection of the ion precipitation situation of the electrode plate in the battery, and facilitate people to master the ion precipitation situation in the battery.

[0015] According to the battery ion precipitation detection device provided by some embodiments of the present application, the battery ion precipitation detection device further includes a conveying unit. The conveying unit includes a conveyor belt and a pulley. The conveyor belt is in transmission connection with the pulley and is sleeved on the pulley. The camera faces the bearing surface of the conveyor belt. The bearing surface of the conveyor belt is used to bear the electrode plate. The camera can collect images of different parts of the electrode plate, so that the battery ion precipitation detection device can perform image collection on the entire electrode plate of the battery, and realize the ion precipitation detection of all electrode plates in the battery cell.

[0016] According to the battery ion precipitation detection device provided by some embodiments of the present application, the battery ion precipitation detection device further includes an illumination unit, and the illumination unit is used to supplement light to the electrode plate, improve the uniformity of the light distribution in the shooting area, and improve the clarity of the images collected by the camera.

[0017] According to the battery ion precipitation detection device provided by some embodiments of the present application, the luminous flux of the illumination unit is greater than or equal to 4000 lumens, so that the light emitted by the illumination unit has sufficient brightness, which is beneficial to improving the image quality of the surface of the electrode plate collected by the camera.

[0018] According to the battery ion precipitation detection device provided by some embodiments of the present application, the battery ion precipitation detection device further includes a bracket, and both the camera and the illumination unit are connected to the bracket, so that the bracket can support the camera and the illumination unit at appropriate positions.

[0019] According to the battery ion precipitation detection device provided by some embodiments of the present application, the camera and the illumination unit face the same direction, and the illumination unit is located on the side of the camera close to the electrode plate, so that the illumination unit has a better effect of supplementing light to the electrode plate.

[0020] According to the battery ion precipitation detection device provided by some embodiments of the present application, the camera and the illumination unit are coaxially arranged, and the illumination unit is wound around the lens of the camera. This not only enables the illumination unit to evenly supplement light to the shooting area of the camera, but also reduces the possibility of the illumination unit blocking the camera shooting.

[0021] According to the battery ion precipitation detection device provided by some embodiments of the present application, the shooting speed range of the camera is 3 frames per second to 10 frames per second, so that the images taken by the camera have better quality.

[0022] According to the battery ion precipitation detection device provided by some embodiments of the present application, the pixel value range of the camera is 30 million to 60 million. This not only enables the images obtained by the camera to have high clarity, but also can reduce the cost increase caused by using too high pixel values of the camera.

[0023] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0024] Some embodiments of the present application provide a battery ion precipitation detection method, and the battery ion precipitation detection method includes the following steps: disassembling the electrode plate of the battery and unfolding the electrode plate; collecting an image of the surface of the electrode plate; processing the image to obtain the area ratio A of the ion precipitation area in the image. Through the above solution, the battery ion precipitation detection method can detect the area ratio A of the ion precipitation area of the electrode plate in the battery, realize the detection of the ion precipitation situation of the electrode plate in the battery, and facilitate people to master the ion precipitation situation in the battery.

[0025] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are given below. Description of the Drawings

[0026] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0027] Figure 1 Flow chart of the battery ion precipitation detection method provided by some embodiments of the present application;

[0028] Figure 2 Flow chart of the battery ion precipitation detection method provided by other embodiments of the present application;

[0029] Figure 3 For Figure 1 Flow chart of step S30 in

[0030] Figure 4 For Figure 3 Flow chart of step S301 in

[0031] Figure 5 For Figure 3 Flow chart of step S302 in

[0032] Figure 6 Structural schematic diagram of one perspective of the battery ion precipitation detection device provided by some embodiments of the present application;

[0033] Figure 7 Structural schematic diagram of another perspective of the battery ion precipitation detection device provided by some embodiments of the present application.

[0034] In the drawings:

[0035] 1. Camera; 2. Processing unit; 3. Conveying unit; 31. Conveyor belt; 32. Pulley; 4. Lighting unit; 5. Bracket; 6. Electrode sheet. Detailed Embodiments

[0036] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of this application should have the ordinary meanings understood by those skilled in the art to which the embodiments of this application belong.

[0038] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0039] In addition, technical terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0040] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific situations.

[0041] In the description of the embodiments of this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0042] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace.

[0043] The battery mentioned in the embodiments of the present application includes one or more battery modules. A battery module refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0044] The battery cell can be a secondary battery cell. A secondary battery cell refers to a battery cell that can activate the active material through charging and continue to be used after the battery cell discharges.

[0045] The battery cell can be an ion battery cell. Ion battery cells include, but are not limited to, lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, magnesium-ion battery cells, and calcium-ion battery cells.

[0046] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes, and at the same time, the ion channels provided thereon can allow the active ions to pass through.

[0047] When the battery cell is charged, metal ions are extracted from the positive electrode plate and embedded in the negative electrode plate, but some abnormal situations may occur, resulting in the precipitation of metal ions and triggering the risk of short circuit between the positive electrode plate and the negative electrode plate.

[0048] Exemplarily, taking the lithium-ion battery cell as an example, due to insufficient lithium-embedding space in the negative electrode plate, too much resistance for lithium ions to embed in the negative electrode plate, or too fast extraction of lithium ions from the positive electrode plate, the extracted lithium ions cannot be embedded in the negative electrode plate in an equal amount. The lithium ions that cannot be embedded in the negative electrode plate can only gain electrons on the surface of the negative electrode plate, thus forming metallic lithium. This is the phenomenon of lithium plating. Lithium plating not only reduces the performance of the lithium-ion battery cell and significantly shortens the cycle life, but also limits the fast charging capacity of the lithium-ion battery cell. In addition, when lithium plating occurs in the battery cell, the plated lithium metal is very active and can react with the electrolyte at a relatively low temperature, resulting in a decrease in the self-heating starting temperature and an increase in the self-heating rate of the battery cell, seriously endangering the reliability of the battery cell.

[0049] Therefore, it is very important for those skilled in the art to know the ion precipitation situation on the electrode plate in the battery. It can not only be used to guide the optimal design of the battery, but also help reduce the occurrence of accidents. In order to detect the ion precipitation situation on the electrode plate in the battery, some embodiments of the present application provide a battery ion precipitation detection method. The steps of the battery ion precipitation detection method are as follows: disassemble the electrode plate of the battery and unfold the electrode plate; collect the image on the surface of the electrode plate; process the image to obtain the area ratio A of the ion precipitation area in the image. The battery ion precipitation detection method can detect the area ratio A of the ion precipitation area on the electrode plate in the battery, realize the detection of the ion precipitation situation on the electrode plate in the battery, and facilitate people to master the ion precipitation situation in the battery.

[0050] A battery ion precipitation detection method provided by an embodiment of the present application can detect the area ratio A of the ion precipitation area on the electrode plate of an ion battery. It can not only be used to detect the area ratio A of the ion precipitation area in the electrode plate of a wound battery cell, but also be used to detect the area ratio A of the ion precipitation area in the electrode plate of a stacked battery cell. The battery ion precipitation detection method can be but is not limited to used for detecting the batteries in power-consuming devices such as mobile phones, laptop computers, vehicles, ships or aircraft.

[0051] The technical solutions of the battery ion precipitation detection method and the detection device provided by the specific embodiments of the present application will be further described below.

[0052] Some embodiments of the present application provide a battery ion precipitation detection method, as Figure 1 shown, the battery ion precipitation detection method includes:

[0053] S10. Disassemble the electrode plate of the battery and unfold the electrode plate.

[0054] The battery ion precipitation detection method is used to detect the ion precipitation area on the electrode plate of the battery. Therefore, the battery ion precipitation detection method needs to disassemble the battery to obtain the electrode plate in the battery, which is convenient for detecting the electrode plate of the battery.

[0055] In this step, it is necessary to unfold the electrode plate of the disassembled battery so as to detect the surface of the electrode plate, making it convenient to obtain the information of the ion precipitation area on the surface of the electrode plate.

[0056] In some embodiments, the electrode plate of the battery should be unfolded as flat as possible so that the surface of the electrode plate is as much as possible in the same plane, which is convenient for improving the quality of the image of the electrode plate surface collected subsequently and is conducive to improving the accuracy of the detection result of the battery ion precipitation detection method.

[0057] S20. Collect the image on the surface of the electrode plate.

[0058] In this step, the surface of the electrode sheet can be imaged by a camera. Through this step, an image of the surface of the electrode sheet can be obtained, so that the image of the surface of the electrode sheet can be processed subsequently, enabling the battery ion precipitation detection method to detect the ion precipitation on the surface of the electrode sheet by processing the image of the surface of the electrode sheet.

[0059] In some embodiments, an image of the surface of the electrode sheet can be obtained by taking a picture of the surface of the electrode sheet using a camera.

[0060] S30. Process the image to obtain the area ratio A of the ion precipitation region in the image.

[0061] After the image of the surface of the electrode sheet is collected, the image is processed through step S30 to obtain the area ratio of the ion precipitation region in the image. Exemplarily, the processing of the image can include at least one of image processing methods such as gray-scale transformation, feature extraction, target detection and recognition, image restoration and enhancement, etc., so as to obtain the area ratio A of the ion precipitation region in the image.

[0062] Through the above technical solution, the battery ion precipitation detection method can detect the area ratio A of the ion precipitation region on the electrode sheet in the battery, realize the detection of the ion precipitation situation on the electrode sheet in the battery, and facilitate people to master the ion precipitation situation in the battery.

[0063] In some embodiments, as Figure 2 shown, the battery ion precipitation detection method may further include:

[0064] S40. Determine the ion precipitation situation. If A < Y1, where Y1 is the first preset ratio, it is determined that the battery has slight ion precipitation; if Y1 ≤ A ≤ Y2, where Y2 is the second preset ratio and Y1 < Y2, it is determined that the battery has moderate ion precipitation; if A > Y2, it is determined that the battery has severe ion precipitation.

[0065] The first preset ratio Y1 and the second preset ratio Y2 are two different values. The ion precipitation situation is determined by comparing the area ratio A of the ion precipitation region with the first preset ratio Y1 and the second preset ratio Y2. Among them, both the first preset ratio Y1 and the second preset ratio Y2 are values less than 100%, and Y1 < Y2. By comparing the area ratio A of the ion precipitation region obtained after image processing with the first preset ratio Y1 and the second preset ratio Y2, the ion precipitation situation can be determined as slight ion precipitation, moderate ion precipitation or severe ion precipitation, so that people can conveniently know the severity of ion precipitation in the battery.

[0066] Through this step, if A < Y1, it can be determined that slight ion precipitation occurs in the battery. If Y1 ≤ A ≤ Y2, it can be determined that moderate ion precipitation occurs in the battery. If A > Y2, it can be determined that severe ion precipitation occurs in the battery. By grading the severity of ion precipitation in the battery, people can directly know the severity of ion precipitation.

[0067] Exemplarily, the first preset ratio Y1 can be configured as 16.67%, and the second preset ratio Y2 can be configured as 33.33%. Those skilled in the art can set the specific values of the first preset ratio Y1 and the second preset ratio Y2 according to the actual situation to divide the severity of ion precipitation in the battery.

[0068] In some embodiments, as Figure 3 shown, step S30 may include the following steps:

[0069] S301. Perform AI recognition on the image to identify the ion precipitation area in the image.

[0070] In the above step S301, by using artificial intelligence (AI) recognition to identify the image, the ion precipitation area in the image can be identified for further processing of the ion precipitation area.

[0071] S302. Calculate the area ratio A of the ion precipitation area in the image.

[0072] Through step S302, based on identifying the ion precipitation area in the image, the area ratio A of the ion precipitation area in the entire image can be calculated, which is convenient for those skilled in the art to determine the ion precipitation situation.

[0073] In some embodiments, as Figure 4 shown, step S301 may include the following steps:

[0074] S3011. Extract the feature area in the image.

[0075] The feature area in the image can be an area that is different in color from other surrounding areas, an area with a dot pattern, or an area with a metallic luster. In this step, the feature area in the image can be identified and extracted by extraction methods.

[0076] On the electrode of a battery, when ions precipitate, the precipitated ions will form a metal layer or metal oxide on the surface of the electrode, resulting in areas in the image of the electrode surface with colors different from those of other surrounding areas, areas in the shape of dots, blocks or patches, and areas with metallic luster. The areas meeting these characteristics are extracted as characteristic areas for further processing to identify the ion precipitation areas therefrom.

[0077] S3012. Compare the characteristic area with the ion precipitation areas in the preset database. If the characteristic area matches any of the precipitation areas in the preset database, output the characteristic area as the recognition result.

[0078] The preset database can be a pre-constructed database with ion precipitation areas of various ions, and the ion precipitation areas therein can be used as labels so that the characteristic areas can be compared with the ion precipitation areas in the preset database. Through comparison, if the characteristic area matches the precipitation area in the preset database, the characteristic area is recognized as the ion precipitation area and output, enabling the battery ion precipitation detection method to identify the ion precipitation areas in the image.

[0079] In some embodiments, as Figure 5 shown, step S302 may include the following steps:

[0080] S3021. Calculate the area S1 of the ion precipitation area.

[0081] After identifying the ion precipitation areas in the image, calculate the area S1 of the ion precipitation area.

[0082] S3022. Calculate the overall area S2 of the image.

[0083] After collecting the overall image of the electrode surface, calculate the overall area S2 of the overall image of the electrode surface.

[0084] S3023. Calculate the ratio of the area S1 of the ion precipitation area to the overall area S2 of the image.

[0085] By calculating the ratio of the area S1 of the ion precipitation area to the overall area S2 of the image, the area ratio A of the ion precipitation area in the image can be obtained, facilitating the determination of the ion precipitation situation.

[0086] In some embodiments, the ions include at least one of sodium ions, lithium ions, magnesium ions, and calcium ions.

[0087] The method for detecting ion precipitation in a battery can detect the ion precipitation in an ion battery. The ions in the battery can be at least one of sodium ions, lithium ions, magnesium ions, and calcium ions. In a lithium-ion battery, the ions that can precipitate are lithium ions, and after precipitation, metallic lithium will be formed on the surface of the electrode. In a sodium-ion battery, the ions that can precipitate are sodium ions, and after precipitation, metallic sodium or its oxide will be formed on the surface of the electrode. In a sodium-lithium-ion battery, the ions that can precipitate are sodium ions and lithium ions, and after precipitation, metallic lithium, metallic sodium, or its oxide will be formed on the surface of the electrode. In a magnesium-ion battery, the ions that can precipitate are magnesium ions, and after precipitation, metallic magnesium or its oxide will be formed on the surface of the electrode. In a calcium-ion battery, the ions that can precipitate are calcium ions, and after precipitation, metallic calcium or its oxide will be formed on the surface of the electrode.

[0088] In some embodiments, the electrode includes at least two electrode sub-parts, and the step of collecting an image of the surface of the electrode is to sequentially collect images of the surfaces of at least two electrode sub-parts.

[0089] The electrode sub-part can be a part of the electrode. By making the electrode include at least two electrode sub-parts, the collection of an image of the surface of the electrode becomes the sequential collection of images of at least two electrode sub-parts, enabling the method for detecting ion precipitation in the battery to detect a relatively large-area electrode step by step, and enabling the method for detecting ion precipitation in the battery to detect ion precipitation in a relatively large-sized battery.

[0090] This application also provides a device for detecting ion precipitation in a battery, as Figure 6 and Figure 7 shown. The device for detecting ion precipitation in the battery includes a camera 1 and a processing unit 2. The camera 1 is used to collect an image of the electrode 6 of the battery, and the processing unit 2 is communicatively connected to the camera 1. The processing unit 2 is used to obtain the area ratio A of the ion precipitation region in the image.

[0091] Using the camera 1 to collect an image of the electrode 6 of the battery facilitates the subsequent processing of the obtained image by the processing unit 2.

[0092] The processing unit 2 can be an industrial control computer, which can perform numerical calculations, logical calculations, and also has a storage and memory function. An AI recognition program can be stored and run in the processing unit 2 to perform corresponding processing on the image collected by the camera 1.

[0093] By communicatively connecting the processing unit 2 to the camera 1, the image of the electrode 6 of the battery collected by the camera 1 can be transmitted to the processing unit 2, so that the processing unit 2 can timely process the image of the electrode 6 of the battery collected by the camera 1.

[0094] Exemplarily, the communication connection between the processing unit 2 and the camera 1 can be a wireless communication connection between the processing unit 2 and the camera 1, or the processing unit 2 and the camera 1 can be connected by a data cable so that the processing unit 2 and the camera 1 can communicate with each other.

[0095] With the above structure, the battery ion precipitation detection device can detect the area ratio A of the ion precipitation area of the electrode plate 6 in the battery, realize the detection of the ion precipitation situation of the electrode plate 6 in the battery, and facilitate people to master the ion precipitation situation in the battery.

[0096] In some embodiments, the battery ion precipitation detection device further includes a conveying unit 3. The conveying unit 3 includes a conveyor belt 31 and a pulley 32. The conveyor belt 31 is in transmission connection with the pulley 32 and is sleeved on the pulley 32. The camera 1 faces the bearing surface of the conveyor belt 31, and the bearing surface of the conveyor belt 31 is used to bear the electrode plate 6.

[0097] The conveying unit 3 can be a unit component for conveying the electrode plate 6 of the battery, which is used to drive the electrode plate 6 to move, so that the camera 1 can collect images of different parts of the electrode plate 6, enabling the battery ion precipitation detection device to perform image acquisition on the entire electrode plate 6 of the battery, and realizing the detection of ion precipitation of all the electrode plates 6 in the battery cell. In addition, using the transmission unit to convey the electrode plate 6 is also beneficial to keep the electrode plate 6 in an unfolded state, which is beneficial to improving the accuracy of the detection results of the battery ion precipitation detection device.

[0098] The conveyor belt 31 can be a component in the conveying unit 3 that is used to bear and transport materials. It is provided with a bearing surface, and the materials can be placed on the bearing surface and transported under the drive of the conveyor belt 31. The pulley 32 can be a wheel-shaped component used to drive the conveyor belt 31 to move. By sleeving the conveyor belt 31 on the outer periphery of the pulley 32 and making the conveyor belt 31 and the pulley 32 achieve transmission connection through friction, the conveyor belt can transport materials under the drive of the pulley 32.

[0099] By setting the camera 1 to face the bearing surface of the conveyor belt 31 and setting the electrode plate 6 on the bearing surface of the conveyor belt 31, the camera 1 can collect images of the electrode plate 6 conveyed on the bearing surface of the conveyor belt 31.

[0100] In some embodiments, the conveying unit 3 further includes a driver (not shown in the figure), and the driver is in transmission connection with the pulley 32.

[0101] The driver can be a motor or an internal combustion engine. The output end of the driver is in transmission connection with the pulley 32, so that the driver can drive the conveyor belt 31 to convey the electrode plate 6 through the pulley 32.

[0102] In some embodiments, the conveying unit 3 further includes a control unit (not shown in the figure), which is communicatively connected to the driver, and the control unit controls the driver to drive the pulley 32 to rotate.

[0103] The control unit can be a unit for controlling the driver to drive the pulley 32 to rotate. Under its control, the driver can drive the conveyor belt 31 to convey the pole piece 6 in a preset state through the pulley 32, so that the camera 1 can collect images of the entire pole piece 6.

[0104] Exemplarily, the driver can be a stepper motor, and the control unit can be a centralized or distributed control unit. For example, the control unit can be a single microcontroller or composed of multiple distributed microcontrollers. A control program can run in the microcontroller to control the conveyor belt 31 of the driver to convey the pole piece 6 in a preset state.

[0105] In some embodiments, there are at least two pulleys 32 arranged at intervals in the first direction. The conveyor belt 31 is sleeved on at least two pulleys 32, and the pole piece 6 is located between the two pulleys 32 at both ends in the first direction. The first direction is perpendicular to the orientation of the camera 1.

[0106] By arranging at least two pulleys 32 at intervals in the first direction and sleeving the conveyor belt 31 outside at least two pulleys 32, the bearing surface of the conveyor belt 31 between the two pulleys 32 at both ends in the first direction can form a plane in the first direction. Since the first direction is perpendicular to the orientation of the camera 1, the pole piece 6 can be flattened on the conveyor belt 31 and then the pole piece 6 can be perpendicular to the orientation of the camera 1, which is beneficial to improving the accuracy of the detection result of the battery ion precipitation detection device.

[0107] Exemplarily, the length between the two pulleys 32 at both ends in the first direction is set to 2 m, the width of the conveyor belt 31 is set to 50 cm, the forward speed of the conveyor belt 31 is set to a constant speed of 1 cm / s, and the conveyor belt 31 is set to stop for 2 s every 20 cm of advancement. After the conveyor belt 31 stops, the camera 1 takes pictures to collect images of the pole piece 6.

[0108] Exemplarily, the camera 1 can be a charge-coupled device (CCD) camera 1. Because the CCD camera 1 has advantages such as high sensitivity, resistance to strong light, and small distortion, it is beneficial to improve the quality of the image of the surface of the pole piece 6 obtained and the accuracy of the detection result of the battery ion precipitation detection method.

[0109] The pixel value range of Camera 1 can be set from 30 million to 60 million, so that the images captured by Camera 1 have high clarity. In some embodiments, the pixel value of Camera 1 can be set to 40 million, 50 million or 60 million, and those skilled in the art can set the pixel value of Camera 1 according to the actual situation. Exemplarily, the pixel value range of Camera 1 can be set from 40 million to 50 million, which not only makes the images captured by Camera 1 have high clarity, but also can reduce the increased cost caused by using too high pixel value of Camera 1.

[0110] The shooting speed range of Camera 1 is configured from 3 frames per second to 10 frames per second. By configuring the shooting speed range of Camera 1 from 3 frames per second to 10 frames per second, the images captured by Camera 1 have good quality. In some embodiments, the shooting speed of Camera 1 can be configured to 4 frames per second, 5 frames per second or 8 frames per second, and those skilled in the art can set the shooting speed of Camera 1 according to the actual situation. Exemplarily, the shooting speed of Camera 1 can be configured from 4 frames per second to 8 frames per second to make the images captured by Camera 1 have good quality.

[0111] Exemplarily, the shooting image area of Camera 1 can be set to 20 cm × 20 cm, which is convenient for realizing segmented image acquisition of the pole piece 6 by conveying the pole piece 6 and enables the segmented image acquisition to fully cover the pole piece 6.

[0112] In some embodiments, the battery ion precipitation detection device further includes an illumination unit 4, and the illumination unit 4 is used to supplement light to the pole piece 6.

[0113] The illumination unit 4 can be a component for illuminating the bearing surface of the conveyor belt 31. It is used to supplement light to the pole piece 6, improve the uniformity of the light distribution in the shooting area, and improve the clarity of the images captured by Camera 1.

[0114] Exemplarily, the illumination unit 4 can include a lamp shade and light-emitting diodes. The light-emitting diodes are arranged inside the lamp shade, and the opening of the lamp shade faces the bearing surface of the conveyor belt 31 for supplementing light to the pole piece 6. In some embodiments, the number range of the light-emitting diodes can be from 60 to 100, so that the illumination unit 4 can emit sufficient brightness light while reducing the possibility of waste. Exemplarily, the outer diameter of the opening of the lamp shade is set to 98 mm, and the distance range from its bearing surface of the conveyor belt 31 is set from 5 cm to 10 cm, so that the illumination unit 4 has a sufficient illumination area for the shooting image area of Camera 1 to fall within this illumination area.

[0115] Exemplarily, the light emitted by the illumination unit 4 can be white light with a color temperature of 6400K, which has little influence on the color of the images on the surface of the pole piece 6 and is convenient for subsequent processing or recognition of the images on the surface of the pole piece 6 according to different colors.

[0116] In some embodiments, the luminous flux of the lighting unit 4 is greater than or equal to 4000 lumens.

[0117] By setting the luminous flux of the lighting unit 4 to be greater than or equal to 4000 lumens, the light emitted by the lighting unit 4 has sufficient brightness, which is beneficial to improving the image quality of the surface of the electrode tab 6 collected by the camera 1.

[0118] In some embodiments, the battery ion precipitation detection device further includes a bracket 5, and both the camera 1 and the lighting unit 4 are connected to the bracket 5.

[0119] The bracket 5 can be a rack for supporting the camera 1 and the lighting unit 4. The bracket 5 is fixedly connected to the ground, and both the camera 1 and the lighting unit 4 are connected to the bracket 5, so that the bracket 5 can support the camera 1 and the lighting unit 4 at appropriate positions.

[0120] Exemplarily, the camera 1 and the lighting unit 4 face the same direction, and the lighting unit 4 is located on the side of the camera 1 close to the electrode tab 6.

[0121] The camera 1 and the lighting unit 4 facing the same direction may mean that the camera 1 is arranged facing the carrying surface of the conveyor belt 31, and the lighting unit 4 is also arranged facing the carrying surface of the conveyor belt 31, so that the area illuminated by the lighting unit 4 can cover the shooting area of the camera 1.

[0122] By locating the lighting unit 4 on the side of the camera 1 close to the electrode tab 6, the lighting unit 4 has a better effect on filling light for the electrode tab 6.

[0123] In some embodiments, the camera 1 and the lighting unit 4 are coaxially arranged, and the lighting unit 4 is wound around the lens of the camera 1.

[0124] By coaxially arranging the camera 1 and the lighting unit 4 and winding the lighting unit 4 around the lens of the camera 1, not only can the lighting unit 4 evenly fill light for the shooting area of the camera 1, but also the possibility of the lighting unit 4 blocking the shooting of the camera 1 is reduced.

[0125] Some embodiments of the present application provide a battery ion precipitation detection device, such as Figure 1As shown in the figure, the battery ion precipitation detection device includes a camera 1, a processing unit 2, a conveying unit 3, an illumination unit 4 and a bracket 5. The processing unit 2 includes a conveyor belt 31 and two pulleys 32. The conveyor belt 31 is sleeved on the two pulleys 32. The electrode plate 6 of the battery is carried on the bearing surface of the conveyor belt 31 between the two pulleys 32. The bracket 5 is fixed on the ground. Both the camera 1 and the illumination unit 4 are connected to the bracket 5 and the illumination unit 4 is wound around the lens of the camera 1. The lens of the camera 1 and the lamp shade of the illumination unit 4 both face the bearing surface of the conveyor belt 31. The illumination unit 4 can supplement light to the electrode plate 6. The camera 1 is used to collect images of the electrode plate 6. The conveyor belt 31 can pass through the shooting field of view of the camera 1 under the drive of the pulley 32, so that the entire electrode plate 6 can be collected by the camera 1. The processing unit 2 is communicatively connected to the camera 1. The processing unit 2 is used to process the images collected by the camera 1 to obtain the area ratio A of the ion precipitation area in the image. Through the above structure, the battery ion precipitation detection device can detect the area ratio A of the ion precipitation area of the electrode plate 6 in the battery, realize the detection of the ion precipitation situation of the electrode plate 6 in the battery, and facilitate people to master the ion precipitation situation in the battery.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting battery ion precipitation, characterized in that, it includes: Disassemble the electrode sheet of the battery and unfold the electrode sheet; Collect an image of the surface of the electrode sheet; Process the image to obtain the area ratio A of the ion precipitation area in the image.

2. The method for detecting battery ion precipitation according to claim 1, characterized in that, the method for detecting battery ion precipitation further includes: Determine the precipitation situation of the ions. If A < Y1, where Y1 is the first preset ratio, it is determined that the battery has slight ion precipitation; if Y1 ≤ A ≤ Y2, where Y2 is the second preset ratio and Y1 < Y2, it is determined that the battery has moderate ion precipitation; if A > Y2, it is determined that the battery has severe ion precipitation.

3. The method for detecting battery ion precipitation according to claim 1, characterized in that, the step of processing the image includes: Perform AI recognition on the image to identify the ion precipitation area in the image; Calculate the area ratio A of the ion precipitation area in the image.

4. The method for detecting battery ion precipitation according to claim 3, characterized in that, the step of performing AI recognition on the image includes: Extract the feature area in the image; Compare the feature area with the ion precipitation area in the preset database. If the feature area matches the precipitation area in the preset database, output the feature area as the recognition result.

5. The method for detecting battery ion precipitation according to claim 1, characterized in that, the ions include at least one of sodium ions, lithium ions, magnesium ions, and calcium ions.

6. The method for detecting battery ion precipitation according to claim 1, characterized in that, the electrode sheet includes at least two electrode sub-parts, and the step of collecting the image of the surface of the electrode sheet is to sequentially collect the images of the surfaces of at least two electrode sub-parts.

7. A battery ion precipitation detection device, characterized in that, it includes: A camera for collecting an image of the electrode sheet of the battery; A processing unit communicatively connected to the camera, and the processing unit is used to obtain the area ratio A of the ion precipitation area in the image.

8. The battery ion precipitation detection device according to claim 7, characterized in that, the battery ion precipitation detection device further includes a conveying unit, and the conveying unit includes a conveyor belt and a pulley. The conveyor belt is in transmission connection with the pulley and is sleeved on the pulley. The camera faces the bearing surface of the conveyor belt, and the bearing surface of the conveyor belt is used to bear the electrode sheet.

9. The battery ion precipitation detection device according to claim 7, characterized in that, the battery ion precipitation detection device further includes an illumination unit, and the illumination unit is used to supplement light to the electrode sheet.

10. The battery ion precipitation detection device according to claim 9, characterized in that, the luminous flux of the illumination unit is greater than or equal to 4000 lumens.

11. The battery ion precipitation detection device according to claim 9, characterized in that, the battery ion precipitation detection device further includes a bracket, and both the camera and the illumination unit are connected to the bracket.

12. The battery ion precipitation detection device according to claim 9, characterized in that, the camera and the lighting unit face the same direction, and the lighting unit is located on the side of the camera close to the electrode plate.

13. The battery ion precipitation detection device according to claim 9, characterized in that, the camera and the lighting unit are coaxially arranged, and the lighting unit is wound around the lens of the camera.

14. The battery ion precipitation detection device according to claim 7, characterized in that, the shooting speed range of the camera is 3 frames per second to 10 frames per second.

15. The battery ion precipitation detection device according to claim 7, characterized in that, the pixel value range of the camera is 30 million to 60 million.

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