Pole piece detection device, pole piece, battery, battery pack, battery pack, and electric vehicle

Abstract

The present invention relates to the technical field of batteries, and discloses a pole piece detection device, a pole piece, a battery, a battery pack, a battery module and an electric vehicle. The pole piece detection device includes: an image acquisition device for acquiring a superimposed image of a positive pole piece and a negative pole piece; a determiner for establishing a coordinate system based on the superimposed image with the negative pole piece as a reference, identifying the positions of any three vertices in the rectangle corresponding to the positive pole piece; respectively detecting the distances of the three vertices from the X-direction edge and the Y-direction edge of the negative pole piece in the coordinate system; and determining whether the X-direction edge distances and the Y-direction edge distances of the three vertices satisfy a safety distance constraint condition. If the three vertices simultaneously satisfy the safety distance constraint condition, it is determined that the detection is qualified. The pole piece detection device provided by the present invention has high accuracy and reliability.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to electrode testing equipment, electrodes, batteries, battery packs, battery bags, and electric vehicles. Background Technology

[0002] Stacking is a manufacturing process that alternately stacks electrode sheets and separators to ultimately complete a multi-layer stacked electrode core. During the stacking process in the stacking equipment, the positive electrode sheet may rotate, causing an abnormal OH (overhang, referring to the portion of the negative electrode sheet that extends beyond the positive electrode sheet in the length and width directions), which affects battery performance.

[0003] In related technologies, two-corner three-point detection or triangular four-point detection is used to determine whether OH is abnormal. However, this method has the risk of failure of other detection points, which affects the accuracy of electrode detection. Summary of the Invention

[0004] This invention provides an electrode testing device, an electrode, a battery, a battery pack, a battery module, and an electric vehicle to solve the problem of low accuracy in electrode testing in related technologies.

[0005] In a first aspect, the present invention provides an electrode testing device, the electrode testing device comprising: Image acquisition equipment used to acquire superimposed images of the positive and negative electrode plates; The determiner is used to establish a coordinate system based on the superimposed image and the negative electrode as a reference, and identify the positions of any three vertices in the rectangle corresponding to the positive electrode; detect the distances of the three vertices from the edge of the negative electrode in the X direction and the edge of the negative electrode in the coordinate system; determine whether the distances of the three vertices from the edge of the negative electrode in the X direction and the edge of the negative electrode satisfy the safety distance constraint condition; if the three vertices simultaneously satisfy the safety distance constraint condition, the detection is deemed qualified.

[0006] In one optional implementation, the safety distance constraint includes a safety boundary width and an allowable activity window; the safety boundary width is used to indicate the allowable lower limit of the distance between the three vertices and the edge of the negative electrode; the allowable activity window is used to indicate the allowable range of movement of the positive electrode; the safety boundary width is (A1-A3) / 2 in the X direction and (B1-B3) / 2 in the Y direction. Where A1 is the width of the negative electrode, B1 is the height of the negative electrode, A3 is the width of the allowed active window, and B3 is the height of the allowed active window.

[0007] In one optional implementation, the maximum allowable distance between the three vertices and the edge of the negative electrode is A1-A2-(A1-A3) / 2 in the X direction and B1-B2-(B1-B3) / 2 in the Y direction. Where A2 is the width of the positive electrode and B2 is the height of the positive electrode.

[0008] In one optional implementation, determining whether the X-direction edge distance and Y-direction edge distance of the three vertices satisfy the safety distance constraint condition includes: Determine if the edge distance in the X direction satisfies: (A1-A3) / 2≤X-direction edge distance≤A1-A2-(A1-A3) / 2; Determine if the edge distance in the Y direction satisfies: (B1-B3) / 2≤Y-direction edge distance≤B1-B2-(B1-B3) / 2.

[0009] In one optional implementation, acquiring the superimposed image of the positive and negative electrodes includes: The superimposed image is obtained by acquiring images of the three vertices using three sets of CCD cameras. The first CCD camera is used to detect the positive ear-side point A in the height direction and the positive ear-side point H in the width direction of the first vertex. The second CCD camera is used to detect the negative ear-side point B in the height direction and the negative ear-side point C in the width direction of the second vertex. The third CCD camera is used to detect the negative ear-side point D in the width direction and the negative ear-side point E in the height direction of the third vertex.

[0010] Secondly, the present invention provides an electrode sheet, the electrode sheet comprising a positive electrode sheet and a negative electrode sheet, wherein the electrode sheet, after being tested by an electrode sheet testing device according to the first aspect above or any corresponding embodiment thereof, is qualified.

[0011] Thirdly, the present invention provides a battery comprising the electrodes as described in the second aspect.

[0012] In one optional embodiment, the battery includes a casing and battery cells disposed within the casing. The casing includes an outer shell and a cover plate. The outer shell is made of metal and has an opening at at least one end. The cover plate covers the opening of the outer shell, thereby forming a closed space within the casing, and an insulating component is disposed between the cover plate and the outer shell. Terminals are provided on the cover plate for leading current out of the battery cells or introducing external current into the battery cells, thereby enabling battery discharge and charging.

[0013] In one alternative implementation, the housing can be square, cylindrical, or blade-shaped, etc.

[0014] In one optional embodiment, the battery cell includes stacked positive electrode plates, a separator, and a negative electrode plate. The battery cell can be a wound battery cell or a stacked battery cell. The positive electrode plate includes a positive tab connected to a positive terminal on a cover plate, and the negative electrode plate includes a negative tab connected to a negative terminal on the cover plate.

[0015] In an optional embodiment, the battery housing is filled with electrolyte.

[0016] In a fourth aspect, the present invention provides a battery pack, including at least two batteries as described in the third aspect above, and each of the batteries is electrically connected to each other.

[0017] In an optional embodiment, the battery pack includes a plurality of the above-mentioned batteries. The plurality of batteries can be arranged in a linear arrangement, a matrix arrangement, or an irregular shape arrangement.

[0018] In an optional embodiment, the tabs of the plurality of batteries are connected by a conductive busbar, so as to achieve series connection or parallel connection between the plurality of batteries.

[0019] In a fifth aspect, the present invention provides a battery pack, including a box body and at least two battery packs as described in the fourth aspect above. Each of the battery packs is disposed in the box body, and each of the battery packs is electrically connected to each other.

[0020] In an optional embodiment, the box body of the battery pack includes a bottom plate, a side plate and a top cover, and the three enclose a containing space for containing the plurality of battery packs above.

[0021] In an optional embodiment, the plurality of battery packs can be arranged in a certain direction in the box body, and the arrangement direction is perpendicular to the arrangement direction of each battery in a battery pack.

[0022] In a sixth aspect, the present invention provides an electric vehicle, including the battery pack as described in the fifth aspect. The battery pack is disposed in the electric vehicle and used to supply power to the electric vehicle.

[0023] In a seventh aspect, the present invention provides a method for detecting a pole piece, which is executed by the pole piece detection device according to the first aspect above or any corresponding embodiment thereof. The method includes: Obtaining an overlapping image of the positive pole piece and the negative pole piece; Based on the overlapping image, establishing a coordinate system with the negative pole piece as a reference, and identifying the positions of any three vertices in the rectangle corresponding to the positive pole piece; Respectively detecting the distances of the three vertices from the X-direction edge and the Y-direction edge of the negative pole piece in the coordinate system; Judging whether the X-direction edge distances and the Y-direction edge distances of the three vertices meet the safety distance constraint conditions. If the three vertices simultaneously meet the safety distance constraint conditions, it is determined that the detection is qualified.

[0024] In an eighth aspect, the present invention provides a pole piece detection device, which is applied to the pole piece detection device according to the first aspect above or any corresponding embodiment thereof. The device includes: An image acquisition module for acquiring an overlapping image of the positive pole piece and the negative pole piece; The position recognition module is used to establish a coordinate system based on the superimposed image and the negative electrode as a reference, and to identify the positions of any three vertices in the rectangle corresponding to the positive electrode. The distance detection module is used to detect the distances of the three vertices from the edge of the negative electrode in the X direction and the edge in the Y direction in the coordinate system, respectively. The judgment module is used to determine whether the edge distance in the X direction and the edge distance in the Y direction of the three vertices meet the safety distance constraint conditions. If the three vertices simultaneously meet the safety distance constraint conditions, the detection is deemed qualified.

[0025] Ninthly, the present invention provides an electronic device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the electrode detection method of the seventh aspect above or any corresponding embodiment thereof.

[0026] In a tenth aspect, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the electrode detection method of the seventh aspect or any corresponding embodiment thereof.

[0027] In one aspect, the present invention provides a computer program product, including computer instructions for causing a computer to execute the electrode detection method of the seventh aspect or any corresponding embodiment described above.

[0028] The technical solution provided by this invention may include the following beneficial effects: The electrode detection device provided by this invention acquires an overlay image of the positive and negative electrodes. Based on the overlay image, a coordinate system is established with the negative electrode as the reference. The device identifies the positions of any three vertices in the rectangle corresponding to the positive electrode and detects the distances of the three vertices from the X-axis edge and Y-axis edge of the negative electrode in the coordinate system. This fully constrains the position of the positive electrode, ensuring that undetected vertices do not affect the accuracy and reliability of electrode detection. It also avoids the cumbersome process of detecting all four vertices, simplifies the detection steps, and improves the efficiency of electrode detection. Furthermore, by judging whether the X-axis edge distance and Y-axis edge distance of the three vertices meet the safety distance constraint conditions, the device is deemed qualified only when all three vertices simultaneously meet the safety distance constraint conditions. This provides clear detection judgment rules and ensures the feasibility of electrode detection. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of electrode detection in related technologies; Figure 2 A schematic diagram of a translational OH anomaly in the related technology is shown; Figure 3 A schematic diagram of a clockwise rotational OH anomaly in the related art is shown; Figure 4 A schematic diagram of a counterclockwise rotating OH anomaly in the related art is shown; Figure 5 This is a schematic diagram of the structure of an electrode testing device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of pole detection according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the positive electrode plate rotating clockwise according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the positive electrode plate rotating counterclockwise according to an embodiment of the present invention; Figure 9 This is a schematic flowchart of an electrode detection method according to an embodiment of the present invention; Figure 10 This is a structural block diagram of an electrode detection device according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Stacking is a manufacturing process that alternately stacks electrode sheets and separators to ultimately complete a multi-layer stacked electrode core. During the stacking process in the stacking equipment, the positive electrode sheet may rotate, causing an abnormal OH (overhang, referring to the portion of the negative electrode sheet that extends beyond the positive electrode sheet in the length and width directions), which affects battery performance.

[0035] In related technologies, two-corner three-point detection or triangular four-point detection is used to determine whether OH is abnormal. However, this method has the risk of failure of other detection points, which affects the accuracy of electrode detection.

[0036] Specifically, Figure 1 This is a schematic diagram of electrode detection in related technologies. For example... Figure 1 As shown, the outer white rectangle represents the negative electrode, the inner dark blue rectangle represents the positive electrode, and the yellow area in the middle represents the edge boundary of the positive electrode (the boundary area between the negative and positive electrodes, meaning the positive electrode cannot extend beyond this yellow area). Two-corner three-point detection refers to detecting points A, B, and C, while triangular four-point detection refers to detecting points A, B, C, and E. Figure 2 The diagram illustrates a translational OH anomaly in related technologies. When the positive electrode sheet translates relative to the negative electrode sheet during stacking (translation along the width, height, or coupled width and height directions), two-corner three-point detection or triangular four-point detection can identify and intercept the relevant OH anomaly. However, when the positive electrode sheet rotates (which can couple translation), there is a risk of OH anomalies on undetected edges, causing the entire stack to fail even if the detected points meet the detection standards. Specifically, Figure 3 A schematic diagram of a clockwise rotation type OH anomaly in the related technology is shown. When the positive electrode plate rotates clockwise, the negative electrode tab B in the height direction, the positive electrode tab F in the height direction, the negative electrode tab D in the width direction, and the positive electrode tab H in the width direction tend to / may exceed the edge limit (yellow area) of the positive electrode plate, resulting in non-conforming stacking. Figure 4 The diagram illustrates a counterclockwise rotation type OH anomaly in the related technology. When the positive electrode plate rotates counterclockwise, the positive electrode tab A in the height direction, the negative electrode tab E in the height direction, the negative electrode tab C in the width direction, and the positive electrode tab G in the width direction tend to exceed the edge limit (yellow area) of the positive electrode plate, resulting in non-conforming stacking.

[0037] Therefore, embodiments of the present invention provide an electrode testing device that improves the accuracy of electrode testing through six-point detection.

[0038] This embodiment provides an electrode testing device. Figure 5 This is a schematic diagram of the structure of an electrode testing device according to an embodiment of the present invention, as shown below. Figure 5 As shown, the electrode detection device includes an image acquisition device and a decision maker.

[0039] This image acquisition device is used to acquire superimposed images of the positive and negative electrode plates.

[0040] The decision-maker is used to establish a coordinate system based on the overlaid image and the negative electrode as a reference, and to identify the positions of any three vertices in the rectangle corresponding to the positive electrode; to detect the distances of the three vertices from the edge of the negative electrode in the X direction and the edge of the negative electrode in the coordinate system; and to determine whether the distances of the three vertices from the edge of the negative electrode in the X direction and the edge of the negative electrode in the Y direction meet the safety distance constraint condition. If the three vertices meet the safety distance constraint condition at the same time, the detection is deemed qualified.

[0041] The overlay image is formed by stacking positive and negative electrode sheets. The overlay image includes a negative electrode sheet and a positive electrode sheet stacked on top of it. Both the positive and negative electrode sheets are rectangular. The image acquisition device can be a standalone camera or a camera deployed within an electrode inspection device.

[0042] The decision-maker identifies the negative electrode in the overlay image and establishes a coordinate system based on the negative electrode. For example, it can establish a coordinate system with one vertex of the negative electrode as the origin, the height direction as the Y direction, and the width direction as the X direction. Next, it identifies the positions of any three vertices of the rectangle corresponding to the positive electrode in the overlay image for subsequent edge distance calculation. After establishing the coordinate system based on the negative electrode and identifying the positions of the three vertices of the positive electrode, it calculates the X-direction edge distance and Y-direction edge distance of each vertex from the edge (edge) of the negative electrode. This safety distance constraint is used to indicate the acceptable range of the positive electrode position. Only when the X-direction edge distance and Y-direction edge distance of the three vertices both meet the safety distance constraint can the electrode detection result of the overlay image be determined as qualified; otherwise, the electrode detection result of the overlay image is determined as unqualified.

[0043] Since the positive electrode plate is a rigid rectangle with definite geometric relationships in the plane, by detecting the edge distances in the X direction and the edge distances in the Y direction (i.e., six sides) of any three vertices of the positive electrode plate, six-point detection is achieved, so that the position and posture of the rectangle corresponding to the positive electrode plate are completely constrained. When the three angles corresponding to the three vertices simultaneously meet the safety distance constraint conditions, the entire positive electrode plate is necessarily within the qualified position range, avoiding the mistakes that may occur in the detection methods in the related technologies and improving the accuracy and reliability of the electrode plate detection.

[0044] Therefore, for the above electrode plate detection device, by obtaining the superimposed image of the positive electrode plate and the negative electrode plate, based on the superimposed image, a coordinate system is established with the negative electrode plate as the reference, the positions of any three vertices in the rectangle corresponding to the positive electrode plate are identified, and the edge distances in the X direction and the edge distances in the Y direction of the three vertices from the negative electrode plate are respectively detected under the coordinate system, so as to completely constrain the position of the positive electrode plate, ensure that the undetected vertices will not affect the accuracy and reliability of the electrode plate detection, and at the same time avoid the cumbersome process of detecting all four vertices, simplify the detection steps, improve the electrode point detection efficiency, and by judging whether the edge distances in the X direction and the edge distances in the Y direction of the three vertices meet the safety distance constraint conditions, only when the three vertices simultaneously meet the safety distance constraint conditions is the detection determined to be qualified, thus providing a clear detection judgment rule and ensuring the feasibility of the electrode plate detection.

[0045] Optionally, the superimposed image is obtained by respectively collecting images of any three vertices in the rectangle corresponding to the positive electrode plate through three groups of CCD (charge coupled device) cameras. The CCD camera refers to a digital camera with a charge coupled device image sensor, and the charge coupled device can convert an optical image into a digital signal. Figure 6 It is a schematic diagram of the electrode point detection according to an embodiment of the present invention. Among them, the white rectangle is the negative electrode plate, the dark blue rectangle is the positive electrode plate, and the yellow rectangle is the allowable movement window of the positive electrode plate. Among them, the superimposed image includes a first image, a second image and a third image. The first CCD camera is used to detect the position A on the positive electrode ear side in the height direction and the position H on the positive electrode ear side in the width direction of the first vertex and collect the first image; the second CCD camera is used to detect the position B on the negative electrode ear side in the height direction and the position C on the negative electrode ear side in the width direction of the second vertex and collect the second image; the third CCD camera is used to detect the position D on the negative electrode ear side in the width direction and the position E on the negative electrode ear side in the height direction of the third vertex and collect the third image.

[0046] In an optional implementation, the safety distance constraint condition includes a safety boundary width and a permitted activity window. The safety boundary width is used to indicate the lower limit of the distance allowed for the three vertices from the edge of the negative electrode sheet, ensuring that the three vertices are within the permitted activity window. The permitted activity window is used to indicate the permitted activity range of the positive electrode sheet.

[0047] In an optional implementation, the safety boundary width is (A1 - A3) / 2 in the X direction and (B1 - B3) / 2 in the Y direction. Here, A1 is the width of the negative electrode sheet (in mm), B1 is the height of the negative electrode sheet (in mm), A3 is the width of the permitted activity window (in mm), and B3 is the height of the permitted activity window (in mm).

[0048] Furthermore, an upper limit of the allowed edge distance is set to ensure that the vertices other than the three vertices (undetected vertices) are within the permitted activity window. Specifically, the upper limit of the allowed edge distance for the three vertices from the edge of the negative electrode sheet is A1 - A2 - (A1 - A3) / 2 in the X direction and B1 - B2 - (B1 - B3) / 2 in the Y direction. Here, A2 is the width of the positive electrode sheet (in mm), and B2 is the height of the positive electrode sheet (in mm).

[0049] In an optional implementation, when determining whether the edge distances in the X direction and Y direction of the three vertices meet the safety distance constraint condition, it is necessary to determine whether the edge distance in the X direction of each vertex meets: (A1 - A3) / 2 ≤ edge distance in the X direction ≤ A1 - A2 - (A1 - A3) / 2; at the same time, determine whether the edge distance in the Y direction of each vertex meets: (B1 - B3) / 2 ≤ edge distance in the Y direction ≤ B1 - B2 - (B1 - B3) / 2. Only when the edge distances in the X direction and Y direction of the three vertices both meet the safety distance constraint condition is the detection determined to be qualified; otherwise, an alarm is given to remind relevant technical personnel to adjust the electrode sheet in a timely manner.

[0050] It should be noted that both the lower limit of the allowed edge distance and the upper limit of the allowed edge distance have taken into account the possible slight rotation and translation of the positive electrode sheet during the lamination process.

[0051] In practical applications, the separator is often stacked on top of the positive electrode during lamination, causing it to obstruct both the positive and negative electrodes in the acquired overlay image, affecting subsequent electrode detection. Related technologies use rectangular infrared light sources to illuminate the stacked electrodes to improve light collection; however, this method has limited impact on the separator's obstruction effect, potentially leading to poor edge detection and affecting the accuracy of detecting the edges of the positive and negative electrodes. In an optional embodiment, the electrode detection device further includes a strip-shaped focused light source. This strip-shaped focused light source illuminates the stacked electrodes in the width direction, utilizing its high contrast, strong directionality, and controllable direction to penetrate the separator, reducing its obstruction effect and enhancing the contrast of the positive and negative electrode edges in the overlay image. This improves the imaging effect from the light source perspective and optimizes the problem of poor edge detection.

[0052] Furthermore, a fault-prevention measure is implemented to prevent the detection frame from being mistakenly identified as the positive or negative electrode edge during edge detection. This adjusts the position and size of the detection frame, forcibly shrinking its boundary to within the membrane. This prevents the detection frame from extending beyond the membrane edge and mistakenly identifying the membrane edge as the positive or negative electrode edge, thus affecting the accuracy of subsequent electrode detection. Specifically, the membrane edge is first identified, and then the detection frame in the width direction is set to have a distance between it and the membrane edge greater than or equal to a preset threshold. This preset threshold can be set according to actual needs, for example, to 5 pixels.

[0053] Furthermore, when the negative electrode edge imaging effect is poor in the width direction, making it difficult to identify the edge and resulting in high edge detection failure, an algorithmic stretching preprocessing is first used to map the grayscale range of the original superimposed image to a wider range, thereby enhancing contrast and improving the subsequent edge detection effect. Specifically, the images of the positive and negative electrode edges are extracted through a preset rectangular region. This preset rectangular region is limited to the area between the diaphragm and the electrode sheet, with no other edges in the middle to avoid interference. Next, the grayscale range of the extracted image is calculated, ignoring 1% extreme values ​​during the calculation to filter out interference from diaphragm white spot reflections. Next, a stretching condition is added to avoid identifying false or incorrect edges. Specifically, the grayscale range is compared with a preset grayscale range threshold. If it is less than the preset threshold, it means the grayscale range of the extracted image is too small, i.e., the grayscale variation is too small. Stretching would amplify noise, such as magnifying tiny blemishes into obvious black dots, interfering with the judgment. Therefore, the extracted image is not stretched, and new positive and negative edge images are extracted again through a preset rectangular area. If it is greater than the preset grayscale range threshold, the extracted image is stretched to enhance contrast. For example, pixels with grayscale values ​​greater than the preset threshold are stretched to black, and pixels with grayscale values ​​less than the preset threshold are stretched to white. Then, the pixels with the strongest color change (e.g., from white to black or from black to white) are identified from top to bottom as edge pixels, and so on, to obtain the negative edges.

[0054] Furthermore, in order to verify the detection effect of the electrode detection device, an effectiveness verification unit is also set up to detect the undetected vertices and verify whether the detection results of the undetected vertices are consistent with the detection results of the three vertices.

[0055] Figure 7 This is a schematic diagram of the positive electrode plate rotating clockwise according to an embodiment of the present invention. It can be seen that when the positive electrode plate rotates clockwise, the edge distances of points A, C and E increase, while the edge distances of points B, D and H decrease. Figure 8 This is a schematic diagram of the positive electrode plate rotating counterclockwise according to an embodiment of the present invention. It can be seen that when the positive electrode plate rotates counterclockwise, the edge distances at points A, C, and E increase, while the edge distances at points B, D, and H decrease. Based on this pattern, the samples and verification methods used are shown in the table below: Table 1: Schematic diagram of experimental verification.

[0056]

[0057] In this diagram, NG indicates failure and OK indicates success. The position of the positive electrode is adjusted along the R-axis (radial axis of the polar coordinate system) to simulate clockwise and counterclockwise rotation. The height direction OH (corresponding to point F) and width direction OH (corresponding to point G) of the undetected vertices of the positive electrode are measured using an image measuring instrument. This verifies whether the detection results of the undetected vertices are consistent with the detection results of the three vertices, thereby verifying the effectiveness of the electrode detection method provided in this embodiment.

[0058] Specifically, first verify the scenario of counterclockwise rotation of the positive electrode. Rotate the positive electrode counterclockwise until at least one corner (one side) of the trigger detection angle fails; then, rotate the positive electrode clockwise until the failed corner (one side) returns to a qualified state; then, rotate the positive electrode counterclockwise again until at least one corner (one side) of the trigger detection angle fails again.

[0059] Next, verify the clockwise rotation scenario of the positive electrode. Rotate the positive electrode clockwise until at least one corner (one side) of the trigger detection angle fails; then, rotate the positive electrode counterclockwise until the failed corner (one side) returns to a qualified state; then, rotate the positive electrode clockwise again until at least one corner (one side) of the trigger detection angle fails.

[0060] During the experiment, regardless of whether the positive electrode was rotated counterclockwise or clockwise, at least one corner (side) was found to be defective. The height direction (OH) and width direction (OH) of the undetected vertex (corner) remained consistent with the electrode detection results. Therefore, the electrode detection method provided in this embodiment has good accuracy and reliability.

[0061] The electrode detection device provided in this embodiment ensures that the three vertices are within the allowed active window by setting a lower limit for the allowable distance between the three vertices and the edge of the negative electrode, and sets an upper limit for the allowable edge distance to ensure that the vertices other than the three vertices (undetected vertices) are within the allowable active window. This provides specific safety distance constraints and improves the feasibility of the solution.

[0062] This embodiment provides an electrode sheet, which includes a positive electrode sheet and a negative electrode sheet. The electrode sheet is subjected to the above-mentioned... Figure 5 After testing by the electrode testing equipment of the embodiment or any of its corresponding implementations, the test result is qualified.

[0063] This embodiment provides a battery, including the electrode sheets described in the above embodiments.

[0064] In one optional embodiment, the battery includes a casing and a battery cell disposed within the casing. The casing includes an outer shell and a cover plate. The outer shell is made of metal and has an opening at at least one end. The cover plate covers the opening of the outer shell, thereby forming a closed space within the casing, and an insulating component is disposed between the cover plate and the outer shell. The cover plate has terminals for drawing current from the battery cell or introducing external current into the battery cell, thereby enabling the battery to discharge and charge.

[0065] Optionally, the housing can be square, cylindrical, or blade-shaped.

[0066] Optionally, the battery cell includes stacked positive electrode plates, a separator, and a negative electrode plate. The battery cell can be a wound battery cell or a stacked battery cell. The positive electrode plate includes a positive electrode tab connected to a positive electrode post on a cover plate, and the negative electrode plate includes a negative electrode tab connected to a negative electrode post on a cover plate.

[0067] Optionally, the battery casing is filled with electrolyte.

[0068] This embodiment provides a battery pack including at least two batteries as described in the above embodiments, each of which is electrically connected to the other.

[0069] Specifically, the battery pack includes multiple batteries as described above. These batteries can be arranged in a straight line, in a matrix, or in an irregular shape.

[0070] Furthermore, the tabs of the multiple batteries are connected by a busbar, thereby enabling the multiple batteries to be connected in series or in parallel.

[0071] This embodiment provides a battery pack, including a housing and at least two battery packs as described in the above embodiments, each battery pack being disposed within the housing and electrically connected to each other.

[0072] In one alternative embodiment, the battery pack housing includes a bottom plate, side plates, and a top cover, which together form a receiving space for accommodating the aforementioned multiple battery packs.

[0073] In one alternative implementation, multiple battery packs can be arranged in a certain direction within the housing, the direction of which is perpendicular to the arrangement direction of each battery in a battery pack.

[0074] This embodiment provides an electric vehicle, including a battery pack as described in the above embodiments. The battery pack is disposed in the electric vehicle and is used to supply power to the electric vehicle.

[0075] According to an embodiment of the present invention, an embodiment of an electrode detection method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0076] This embodiment provides an electrode detection method that can be used in desktop computers, laptops, industrial control computers, etc. Figure 9 This is a schematic flowchart of an electrode detection method according to an embodiment of the present invention, as shown below. Figure 8 As shown, the process includes the following steps: Step S901: Obtain an overlay image of the positive and negative electrode plates.

[0077] Please see details Figure 5 The embodiments shown are not described in detail here.

[0078] Step S902: Based on the superimposed image, establish a coordinate system with the negative electrode as the reference, and identify the positions of any three vertices in the rectangle corresponding to the positive electrode.

[0079] Please see details Figure 5 The embodiments shown are not described in detail here.

[0080] Step S903: Detect the distances of the three vertices from the edge of the negative electrode in the X and Y directions in the coordinate system.

[0081] Please see details Figure 5 The embodiments shown are not described in detail here.

[0082] Step S904: Determine whether the edge distances in the X and Y directions of the three vertices meet the safety distance constraint. If the three vertices simultaneously meet the safety distance constraint, the test is deemed qualified.

[0083] This embodiment also provides an electrode detection device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0084] This embodiment provides an electrode detection device, such as... Figure 10 As shown, it includes: Image acquisition module 1001 is used to acquire an overlay image of the positive electrode and the negative electrode; The position recognition module 1002 is used to establish a coordinate system based on the superimposed image and the negative electrode as a reference, and to identify the positions of any three vertices in the rectangle corresponding to the positive electrode. The distance detection module 1003 is used to detect the distances of the three vertices from the edge of the negative electrode in the X direction and the edge in the Y direction in the coordinate system, respectively. The judgment module 1004 is used to determine whether the edge distance in the X direction and the edge distance in the Y direction of the three vertices meet the safety distance constraint condition. If the three vertices meet the safety distance constraint condition at the same time, the detection is deemed qualified.

[0085] In one optional implementation, the safety distance constraint includes a safety boundary width and an allowable activity window; the safety boundary width is used to indicate the allowable lower limit of the distance between the three vertices and the edge of the negative electrode; the allowable activity window is used to indicate the allowable range of movement of the positive electrode; the safety boundary width is (A1-A3) / 2 in the X direction and (B1-B3) / 2 in the Y direction. Where A1 is the width of the negative electrode, B1 is the height of the negative electrode, A3 is the width of the allowed active window, and B3 is the height of the allowed active window.

[0086] In one optional implementation, the maximum allowable distance between the three vertices and the edge of the negative electrode is A1-A2-(A1-A3) / 2 in the X direction and B1-B2-(B1-B3) / 2 in the Y direction. Where A2 is the width of the positive electrode and B2 is the height of the positive electrode.

[0087] In an optional implementation, the determination module is further configured to: Determine if the edge distance in the X direction satisfies: (A1-A3) / 2≤X-direction edge distance≤A1-A2-(A1-A3) / 2; Determine if the edge distance in the Y direction satisfies: (B1-B3) / 2≤Y-direction edge distance≤B1-B2-(B1-B3) / 2.

[0088] In one optional implementation, the image acquisition module is further configured to: The superimposed image is obtained by acquiring images of the three vertices using three sets of CCD cameras. The first CCD camera is used to detect the positive ear-side point A in the height direction and the positive ear-side point H in the width direction of the first vertex. The second CCD camera is used to detect the negative ear-side point B in the height direction and the negative ear-side point C in the width direction of the second vertex. The third CCD camera is used to detect the negative ear-side point D in the width direction and the negative ear-side point E in the height direction of the third vertex.

[0089] The electrode detection device provided in this embodiment of the invention can execute the electrode detection method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0090] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0091] The following is a detailed reference. Figure 11 The diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 1101, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 1102 or a program loaded from memory 1108 into random access memory (RAM) 1103. The RAM 1103 also stores various programs and data required for the operation of the electronic device. The processor 1101, ROM 1102, and RAM 1103 are interconnected via a bus 1104. An input / output (I / O) interface 1105 is also connected to the bus 1104.

[0092] Typically, the following devices can be connected to I / O interface 1105: input devices 1106 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 1107 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 1108 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1109. Communication device 1109 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 11 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0093] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 1109, or installed from a memory 1108, or installed from a ROM 1102. When the computer program is executed by the processor 1101, it performs the functions defined in the electrode detection method of the embodiments of the present invention.

[0094] Figure 11 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0095] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the electrode detection method shown in the above embodiments is implemented.

[0096] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0097] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the invention.

Claims

1. A pole piece inspection apparatus characterized by, The electrode testing equipment includes: Image acquisition equipment used to acquire superimposed images of the positive and negative electrode plates; The determiner is used to establish a coordinate system based on the superimposed image and the negative electrode as a reference, and identify the positions of any three vertices in the rectangle corresponding to the positive electrode; detect the distances of the three vertices from the edge of the negative electrode in the X direction and the edge of the negative electrode in the coordinate system; determine whether the distances of the three vertices from the edge of the negative electrode in the X direction and the edge of the negative electrode satisfy the safety distance constraint condition; if the three vertices simultaneously satisfy the safety distance constraint condition, the detection is deemed qualified.

2. The pole piece inspection apparatus of claim 1, wherein The safety distance constraint includes a safety boundary width and an allowable activity window; the safety boundary width is used to indicate the lower limit of the allowable distance between the three vertices and the edge of the negative electrode; the allowable activity window is used to indicate the allowable range of movement of the positive electrode; the safety boundary width is (A1-A3) / 2 in the X direction and (B1-B3) / 2 in the Y direction; Where A1 is the width of the negative electrode, B1 is the height of the negative electrode, A3 is the width of the allowed active window, and B3 is the height of the allowed active window.

3. The pole piece inspection apparatus of claim 2, wherein The maximum allowable distance between the three vertices and the edge of the negative electrode is A1-A2-(A1-A3) / 2 in the X direction and B1-B2-(B1-B3) / 2 in the Y direction. Where A2 is the width of the positive electrode and B2 is the height of the positive electrode.

4. The electrode testing equipment according to claim 3, characterized in that, The step of determining whether the edge distances in the X and Y directions of the three vertices satisfy the safety distance constraint includes: Determine if the edge distance in the X direction satisfies: (A1-A3) / 2≤X-direction edge distance≤A1-A2-(A1-A3) / 2; Determine if the edge distance in the Y direction satisfies: (B1-B3) / 2≤Y-direction edge distance≤B1-B2-(B1-B3) / 2.

5. The electrode testing device according to any one of claims 1 to 4, characterized in that, The process of acquiring the superimposed image of the positive and negative electrodes includes: The superimposed image is obtained by acquiring images of the three vertices using three sets of CCD cameras. The first CCD camera is used to detect the positive ear-side point A in the height direction and the positive ear-side point H in the width direction of the first vertex. The second CCD camera is used to detect the negative ear-side point B in the height direction and the negative ear-side point C in the width direction of the second vertex. The third CCD camera is used to detect the negative ear-side point D in the width direction and the negative ear-side point E in the height direction of the third vertex.

6. An electrode sheet, characterized in that, The electrode includes a positive electrode and a negative electrode, and the electrode is qualified after being tested by the electrode testing equipment according to any one of claims 1-5.

7. A battery, characterized in that, Including the electrode as described in claim 6.

8. A battery pack, characterized in that, It includes at least two batteries as described in claim 7 above, each of which is electrically connected to the other.

9. A battery pack, characterized in that, It includes a housing and at least two battery packs as described in claim 8, each of the battery packs being disposed within the housing and electrically connected to each other.

10. An electric vehicle, characterized in that, Includes the battery pack as described in claim 9.

11. A method for detecting electrode sheets, characterized in that, The electrode testing method, performed by the electrode testing equipment according to any one of claims 1-5, comprises: Obtain an overlay image of the positive and negative electrode plates; Based on the superimposed image, establish a coordinate system with the negative electrode sheet as the reference, and identify the positions of any three vertices in the rectangle corresponding to the positive electrode sheet; Detect the distances of the three vertices from the X-direction edge and Y-direction edge of the negative electrode sheet in the coordinate system respectively; Judge whether the X-direction edge distances and Y-direction edge distances of the three vertices satisfy the safety distance constraint conditions. If the three vertices simultaneously satisfy the safety distance constraint conditions, it is determined that the detection is qualified.

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