Dimension measuring device

Abstract

A dimension measuring device comprises a bearing plate (2) and a line scanning camera (3). The bearing plate (2) is used for bearing a to-be-measured piece; the line scanning camera (3) is opposite to the bearing plate (2) along a first direction (X) and is used for shooting a to-be-measured piece, the line scanning camera (3) is configured to move relative to the bearing plate (2) along a second direction (Y), and the first direction (X) is perpendicular to the second direction (Y). The size measuring device can improve the shooting efficiency.

Description

Dimension measuring device Technical Field

[0001] The present application relates to the field of batteries, and in particular to a size measuring device. Background Art

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] Battery cells include electrode assemblies. During the production process of battery cells, it is necessary to measure the dimensions of the electrode assemblies by taking images to facilitate the subsequent assembly process. Improving the efficiency of photography is an important research direction.

[0004] Summary of the Invention

[0005] The present application provides a size measuring device, which can improve the efficiency of photographing.

[0006] The present invention provides a dimension measurement device comprising a support plate and a line scan camera. The support plate is used to support a workpiece to be measured; the line scan camera is positioned relative to the support plate along a first direction and is used to photograph the workpiece to be measured. The line scan camera is configured to be movable relative to the support plate along a second direction, the first direction being perpendicular to the second direction.

[0007] In the above technical solution, a line scan camera is provided to move relative to the carrier plate in the second direction, thereby photographing the parts to be measured on the carrier plate, such as electrode assemblies. This improves the efficiency of photographing compared to a solution using a repeatedly paused area array camera for photographing.

[0008] In some embodiments, the line scan camera is configured to be movable.

[0009] In the above technical solution, since a plurality of devices for assisting in measuring the size of the electrode assembly may be fixed on the carrier plate, the line scan camera is set to be movable, which can reduce the complexity of setting up the size detection device.

[0010] In some embodiments, a plurality of line scan cameras are provided, and the plurality of line scan cameras include a first line scan camera and a second line scan camera; the first line scan camera and the second line scan camera are arranged along a third direction, and the third direction intersects with the second direction.

[0011] In the above technical solution, at least two line scan cameras are provided to increase the shooting range, so that shooting and measurement can also be performed on electrode assemblies with larger sizes, thereby increasing the applicability of the size measuring device; or two line scan cameras can be arranged along the direction of the larger size of the electrode assembly (for example, the length direction), thereby reducing the relative movement distance between the line scan camera and the supporting plate, thereby improving the shooting efficiency.

[0012] In some embodiments, the object to be measured is an electrode assembly.

[0013] In some embodiments, the electrode assembly includes an electrode body and two electrode tabs, the electrode body includes a top area and a bottom area arranged opposite to each other, and the two electrode tabs extend from the top area; the third direction is configured to be parallel to the arrangement direction of the top area and the bottom area.

[0014] In the above technical solution, the third direction is configured to be parallel to the arrangement direction of the top area and the bottom area. In this way, the first line scan camera and the second line scan camera can respectively photograph the top area and the bottom area of ​​the electrode assembly, thereby obtaining dimensional information such as the length and width of the electrode assembly.

[0015] In some embodiments, the dimension measuring device further includes a frame, and the supporting plate and the line scan camera are disposed on the frame.

[0016] In the above technical solution, by connecting the support plate and line scan camera to the frame, the dimension detection device is connected into a single unit, making it easy to store and move. Moreover, when attaching the dimension detection device to another object, only the frame needs to be fixed to the object, which simplifies the operation steps.

[0017] In some embodiments, the size measuring device further includes a backlight source connected to the frame, the supporting plate has a supporting surface for supporting the electrode assembly and a back surface opposite to the supporting surface, and the backlight source is located on the side of the back surface away from the supporting surface.

[0018] In the above technical solution, a backlight source is provided to illuminate the portion of the electrode assembly whose size needs to be measured, so as to be used in conjunction with a line scan camera to increase the brightness of the shooting and thereby improve the accuracy of the measurement result.

[0019] In some embodiments, the size measuring device further includes a connector for connecting the supporting plate and the frame. There are two backlight sources, and there is a receiving space between the two backlight sources. The connector passes through the receiving space.

[0020] In the above technical solution, the connector is directly connected to the supporting plate through the accommodating space. In this way, not only the structure of the connector is simplified, but the connector also does not interfere with the backlight source, that is, it almost does not block the backlight source from irradiating the electrode assembly, thereby reducing the impact on the shooting of the electrode assembly.

[0021] In some embodiments, the size measuring device further includes a flattening mechanism, which includes a first driving member and a pressing plate. The part to be measured is an electrode assembly. The first driving member is connected to the frame and is used to drive the pressing plate to press the electrode tab of the electrode assembly.

[0022] In the above technical solution, since the edge of the tab may be warped, a certain part may have a bulge or other surface unevenness when measuring, a flattening mechanism is provided to flatten the uneven parts of the tab as much as possible, thereby improving the accuracy of the size measurement of the tab.

[0023] In some embodiments, the flattening mechanism further includes a support member connected to the frame and having an abutting plane, wherein the abutting plane is used to abut against a surface of the electrode tab of the electrode assembly facing away from the pressing plate.

[0024] In the above technical solution, a support member is provided to support the tab, which not only facilitates pressing by the pressing plate, but also enables the other side of the tab to be pressed by the abutting plane, that is, both sides of the tab are pressed, further improving the flatness of the tab, thereby improving the accuracy of the tab size measurement.

[0025] In some embodiments, the size measuring device further includes a positioning mechanism, which includes a second driving member and a positioning member. The second driving member is connected to the frame and is used to drive the positioning member to push the piece to be measured to a preset position.

[0026] The position of the workpiece to be measured is not precise when it is placed on the supporting plate. For example, it may be at an angle or distance from the preset position. In this embodiment, a positioning mechanism is used to push it to the preset position, so that the camera is taken at the preset position, which increases the accuracy of the photographed measurement results, reduces the possibility that the edge of the workpiece to be measured is not photographed due to inaccurate position, and improves the accuracy of the measurement results.

[0027] In some embodiments, the shooting range of the first line scan camera covers at least two tabs of the electrode assembly, and the shooting range of the second line scan camera covers at least the bottom area of ​​the electrode assembly.

[0028] In the above technical solution, the first line scan camera is configured so that it can capture the two pole ears, thereby obtaining the length of the pole ears extending out of the top area and the distance between the two pole ears, and can also determine the position of the connection between the pole ears and the top area, that is, the top surface position of the electrode body can be determined; the second line scan camera can determine the position of the side opposite to the pole ears in the bottom area. In this way, after knowing the top surface position and the position of the side opposite to the pole ears, the length of the electrode body can be determined, and after knowing the size of the bottom area, the width of the electrode assembly can be known, thereby obtaining more dimensional data of the electrode assembly.

[0029] In some embodiments, the first line scan camera is further used to photograph the top area of ​​the electrode assembly. The first line scan camera covers a photographing range D1 along the third direction of the top area, where D1>30 mm.

[0030] In the above technical solution, the shooting range of the first line scan camera along the third direction is set to be greater than 30 mm, that is, the shooting range is larger, which can reduce the influence of reasons such as folding and warping on the measurement results and improve the accuracy of the measurement results.

[0031] In some embodiments, the shooting range of the first line scan camera along the third direction is D2, the standard size of the tab along the third direction is D3, D2>D1+D3+K1, 5mm≤K1≤40mm.

[0032] In the above technical solution, the shooting range D3 of the first line scan camera along the third direction is set to be greater than the sum of D1, D3 and K1, so that the coverage range of the first line scan camera along the third direction can fully cover the pole ear and the top area, thereby improving the accuracy of the algorithm's edge processing and thus improving the accuracy of the measurement results.

[0033] In some embodiments, the shooting range of the first line scan camera along the third direction further includes a first blank area, and the first blank area is located on a side of the tab away from the top area.

[0034] In the above technical solution, a first blank area is set on the side of the tab away from the top area, which can almost ensure that the image of the tab is captured, improve the accuracy of the algorithm edge processing, and further increase the accuracy of the tab size measurement.

[0035] In some embodiments, the second line scan camera covers a shooting range D4 along the third direction in the bottom area, where D4>30 mm.

[0036] In the above technical solution, the shooting range of the second line scan camera along the third direction is set to be greater than 30 mm, that is, the shooting range is larger, which can reduce the influence of reasons such as folding and warping on the measurement results and improve the accuracy of the measurement results.

[0037] In some embodiments, the shooting range of the second line scan camera along the third direction is D5, D5>D4+K2, 5mm≤K2≤40mm.

[0038] In the above technical solution, the shooting range D5 of the second line scan camera along the third direction is set to be greater than the sum of D4 and K2, so that the coverage range of the second line scan camera along the third direction can fully cover the bottom area, thereby improving the accuracy of the measurement results.

[0039] In some embodiments, the shooting range of the second line scan camera along the third direction further includes a second blank area, and the second blank area is located on a side of the bottom area away from the top area.

[0040] In the above technical solution, a second blank area is set on the side of the bottom area away from the top area, so as to almost ensure that the image of the bottom area is captured, improve the accuracy of the algorithm edge processing, and thus increase the accuracy of the bottom area size measurement.

[0041] In some embodiments, the resolution of the first line scan camera is Σ1, Σ1≥40*D2 / L, and L is the width of the tolerance band of the dimension of the electrode assembly along the third direction.

[0042] In the above technical solution, the resolution of the first line scan camera is linked to the shooting range and the tolerance band width of the electrode assembly, which can meet the resolution requirements of different electrode assemblies and thus improve the accuracy of the measurement results.

[0043] In some embodiments, the resolution of the second line scan camera is Σ2, Σ2≥40*D4 / L2, and L is the tolerance band width of the dimension of the electrode assembly along the third direction.

[0044] In the above technical solution, the resolution of the second line scan camera is linked to the shooting range and the tolerance band width of the electrode assembly, which can meet the resolution requirements required by different electrode assemblies and thus improve the accuracy of the measurement results.

[0045] In some embodiments, the movement speed of the line scan camera along the second direction is v,450 mm / s<v<600 mm / s.

[0046] In the above technical solution, setting the movement speed of the line scan camera along the second direction to less than 600 mm / s can reduce the possibility of frame loss and improve the shooting quality; setting the speed of the line scan camera along the second direction Y to greater than 450 mm / s can improve the shooting efficiency and speed up the detection speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0048] FIG1 is a schematic diagram of a partial structure of a size detection device according to an embodiment of the present application;

[0049] FIG2 is another partial structural diagram of the size detection device according to an embodiment of the present application;

[0050] FIG3 is a schematic diagram of another partial structure of the size detection device according to an embodiment of the present application;

[0051] FIG4 is a schematic structural diagram of a positioning mechanism and a backlight source of a size detection device according to an embodiment of the present application;

[0052] FIG. 5 is a schematic diagram of the shooting range of the line scan camera of the size detection device according to an embodiment of the present application.

[0053] In the drawings, the drawings are not drawn to scale.

[0054] The reference numerals for the specific embodiments are as follows:

[0055] 1. Electrode assembly; 11. Electrode body; 12. Electrode tab; 13. Top area; 14. Bottom area;

[0056] 2. Loading plate; 21. Loading surface; 22. Back surface;

[0057] 3. Line scan camera; 31. First line scan camera; 311. First blank area; 32. Second line scan camera; 321. Second blank area;

[0058] 4. Frame;

[0059] 5. Backlight source; 51. Accommodation space;

[0060] 6. Flattening mechanism; 61. First driving member; 62. Pressing plate; 63. Support member; 631. Abutting plane;

[0061] 7. Positioning mechanism; 71. Second driving member; 72. Positioning member;

[0062] 8. Connectors;

[0063] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0064] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0066] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0068] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0069] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0070] The term "plurality" used in this application refers to two or more (including two).

[0071] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0072] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0073] During the production of battery cells, it is necessary to inspect the dimensions of the electrode assembly, such as its length and width, to determine whether it is qualified. In related technologies, an area array camera is often used to capture the electrode assembly and then calculate the dimensional data.

[0074] The inventors found that when using an area array camera, due to its limited shooting range, the same electrode assembly needs to be moved to different positions in sequence to take pictures. Both movement and pause require time, so the efficiency of using an area array camera for shooting is low.

[0075] In view of this, the present application provides a technical solution, which uses a mobile line scan camera to shoot and take pictures of the workpiece to be measured. The line scan camera moves at a certain speed when taking pictures without stopping, thereby speeding up the shooting efficiency.

[0076] Figure 1 is a partial structural schematic diagram of the size detection device of an embodiment of the present application; Figure 2 is another partial structural schematic diagram of the size detection device of an embodiment of the present application; Figure 3 is yet another partial structural schematic diagram of the size detection device of an embodiment of the present application.

[0077] As shown in Figures 1 to 3, the dimension measurement device of an embodiment of the present application includes a support plate 2 and a line scan camera 3. The support plate 2 is used to support the workpiece to be measured. The line scan camera 3 is opposite to the support plate 2 along a first direction X and is used to photograph the workpiece to be measured. The line scan camera 3 is configured to be movable relative to the support plate 2 along a second direction Y, with the first direction X and the second direction Y being perpendicular.

[0078] The embodiment of the present application does not limit the shape of the supporting plate 2 , which can be rectangular, circular or other irregular shapes.

[0079] Optionally, the size of the carrying plate 2 is smaller than the size of the electrode assembly 1 , and the carrying plate 2 can be covered by the electrode assembly 1 .

[0080] Optionally, the carrying plate 2 is made of transparent material.

[0081] In the embodiment of the present application, the first direction X is perpendicular to the support plane, and the second direction Y is parallel to the support plane. Further optionally, the second direction Y is parallel to the width direction or the length direction of the electrode assembly 1. The length of the electrode assembly 1 is greater than or equal to the width direction.

[0082] In an embodiment of the present application, the line scan camera 3 is configured to be able to move relative to the supporting plate 2 along the second direction Y, that is, the line scan camera 3 and the supporting plate 2 are in relative motion. In other words, only the line scan camera 3 may move, or only the supporting plate 2 may move, or the line scan camera 3 and the supporting plate 2 may move together and produce relative displacement.

[0083] The embodiments of the present application do not limit the manner in which the line scan camera 3 and / or the supporting plate 2 can be moved. For example, a linear motor, a pneumatic cylinder, or a hydraulic cylinder can be used to drive the line scan camera 3 or the supporting plate 2 to move, or the line scan camera 2 and the supporting plate 2 can be driven to move together.

[0084] The part to be measured in the embodiment of the present application may be an electrode assembly, or a battery cell or other component whose dimensions need to be measured.

[0085] A line scan camera 3 is positioned to move relative to the support plate 2 in the second direction Y, thereby photographing the object to be measured on the support plate 2, such as the electrode assembly 1. This improves photographing efficiency compared to a method employing an area array camera that repeatedly pauses. Furthermore, because the photographing accuracy of the line scan camera 3 is generally higher than that of an area array camera, the dimensional measurement device of the embodiment of the present application also increases photographing accuracy, thereby making the calculation results of the photographed object to be measured more accurate, thereby improving the measurement accuracy of the object to be measured.

[0086] In some embodiments, the line scan camera 3 is configured to be movable.

[0087] Since a plurality of devices for assisting in measuring the size of the electrode assembly 1 may be fixed on the supporting plate 2 , setting the line scan camera 3 to be movable can reduce the complexity of setting up the size detection device.

[0088] In some embodiments, the line scan camera 3 is provided in plurality, and the plurality of line scan cameras 3 include a first line scan camera 31 and a second line scan camera 32 ; the first line scan camera 31 and the second line scan camera 32 are arranged along a third direction Z, and the third direction Z intersects with the second direction Y.

[0089] The embodiment of the present application does not limit whether the first line scan camera 31 and the second line scan camera 32 are the same. The two can be the same or different.

[0090] The shooting ranges of the first line scan camera 31 and the second line scan camera 32 in the embodiment of the present application may overlap with each other, or they may respectively shoot different parts of the electrode assembly 1 .

[0091] Optionally, the third direction Z is perpendicular to the second direction Y. Further optionally, the third direction Z is perpendicular to the first direction X.

[0092] Providing at least two line scan cameras 3 can increase the shooting range, so that the electrode assembly 1 with a larger size can also be photographed and measured, thereby increasing the applicability of the size measuring device; or two line scan cameras 3 can be arranged along the direction of the larger size of the electrode assembly 1 (for example, the length direction), thereby reducing the relative movement distance between the line scan camera 3 and the supporting plate 2, thereby improving the shooting efficiency.

[0093] In some embodiments, the object to be measured is an electrode assembly 1 .

[0094] In some embodiments, the electrode assembly 1 includes an electrode body 11 and two electrode tabs 12, the electrode body 11 includes a top area 13 and a bottom area 14 arranged opposite to each other, and the two electrode tabs 12 extend from the top area 13; the third direction Z is configured to be parallel to the arrangement direction of the top area 13 and the bottom area 14.

[0095] When the electrode assembly 1 is placed on the carrier plate 2 , the top region 13 and the bottom region 14 are arranged along the third direction Z.

[0096] The third direction Z is configured to be parallel to the arrangement direction of the top area 13 and the bottom area 14. In this way, the first line scan camera 31 and the second line scan camera 32 can respectively photograph the top area 13 and the bottom area 14 of the electrode assembly 1, thereby obtaining dimensional information such as the length and width of the electrode assembly 1.

[0097] Optionally, the extending directions of the shooting lines of the first line scan camera 31 and the second line scan camera 32 are parallel to the third direction Z.

[0098] Optionally, the second direction Y is perpendicular to the third direction Z. With this arrangement, for a substantially rectangular electrode assembly 1, the first line scan camera 31 and the second line scan camera 32 are arranged along the length direction of the electrode assembly 1 and move along the width direction of the electrode assembly 1. This can reduce the movement distance of the first line scan camera 31 and the second line scan camera 32, thereby improving shooting efficiency.

[0099] In some embodiments, the dimension measuring device further includes a frame 4 , and the supporting plate 2 and the line scan camera 3 are disposed on the frame 4 .

[0100] The embodiment of the present application does not limit the connection method between the frame 4, the supporting plate 2, and the line scan camera 3. For example, the frame 4 is fixedly connected to the supporting plate 2, and the frame 4 is movably connected to the line scan camera 3. In another example, the frame 4 is movably connected to the supporting plate 2, and the frame 4 is fixedly connected to the line scan camera 3. In another example, the frame 4 is movably connected to both the supporting plate 2 and the line scan camera 3.

[0101] By attaching the support plate 2 and line scan camera 3 to the frame 4, the size detection device is integrated into a single unit, making it easy to store and move. Furthermore, when attaching the size detection device to another object, only the frame 4 needs to be attached to the object, simplifying the operation.

[0102] In some embodiments, the size measuring device also includes a backlight source 5 connected to the frame 4, the supporting plate 2 has a supporting surface 21 for supporting the electrode assembly 1 and a back surface 22 opposite to the supporting surface 21, and the backlight source 5 is located on the side of the back surface 22 away from the supporting surface 21.

[0103] The carrying surface 21 of the embodiment of the present application includes the above-mentioned carrying plane.

[0104] Optionally, there is a gap between the backlight source 5 and the carrying plate 2 .

[0105] The backlight source 5 of the embodiment of the present application can illuminate part of the electrode assembly 1 or the entire electrode assembly 1 .

[0106] The embodiment of the present application does not limit the shape of the backlight source 5. For example, the backlight source 5 can be a rectangular light source, a trapezoidal light source, etc.

[0107] A backlight source 5 is provided to illuminate the portion of the electrode assembly 1 whose size needs to be measured, so as to be used in conjunction with the line scan camera 3 to increase the brightness of the shooting and thereby improve the accuracy of the measurement result.

[0108] In some embodiments, the size measuring device further includes a connector 8 , which is used to connect the carrier plate 2 and the frame 4 . There are two backlight sources 5 , and there is a receiving space 51 between the two backlight sources 5 . The connector 8 passes through the receiving space 51 .

[0109] The embodiment of the present application does not limit the shape of the connector 8. For example, the connector 8 can be in the shape of a plate, a rod, or other irregular shapes.

[0110] Optionally, the connecting member 8 is connected to the back surface 22 .

[0111] Optionally, a projection of the connecting member 8 along the first direction X on the first plane does not overlap with a projection of the backlight source 5 along the first direction X on the first plane, wherein the first plane is perpendicular to the first direction X.

[0112] The connector 8 is directly connected to the supporting plate 2 through the accommodating space 51. In this way, not only the structure of the connector 8 is simplified, but the connector 8 also does not interfere with the backlight source 5, that is, it almost does not block the backlight source 5 from irradiating the electrode assembly 1, thereby reducing the impact on the shooting of the electrode assembly 1.

[0113] The electrode assembly 1 includes an electrode body 11 and two tabs 12. The electrode body 11 includes a top region 13 and a bottom region 14 that are arranged opposite each other. The two tabs 12 extend from the top region 13. The third direction Z is configured to be parallel to the arrangement direction of the top region 13 and the bottom region 14. Optionally, two backlight sources 5 are arranged at intervals along the third direction Z. The two backlight sources 5 are arranged along the third direction Z so that one backlight source 5 can illuminate the tabs 12 and the top region 13, and the other backlight source 5 can illuminate the bottom region 14, thereby improving the accuracy of measurement of the aforementioned areas.

[0114] In some embodiments, the size measuring device also includes a flattening mechanism 6, which includes a first driving member 61 and a pressing plate 62. The part to be measured is the electrode assembly 1. The first driving member 61 is connected to the frame 4 and is used to drive the pressing plate 62 to press the electrode ear 12 of the electrode assembly 1.

[0115] The pressing plate 62 of the embodiment of the present application is made of a transparent material. The embodiment of the present application does not limit the shape of the pressing plate 62. For example, the pressing plate 62 is a T-shaped plate or a triangular plate.

[0116] The pressing plate 62 of the embodiment of the present application has a pressing surface, and the pressing surface is used to abut against the tab 12 and flatten it.

[0117] Optionally, the pressing plate 62 can press the two tabs 12 of the electrode assembly 1 at the same time.

[0118] The specific structure of the first driving member 61 is not limited in this embodiment of the present application. For example, the first driving member 61 is a motor, a hydraulic cylinder, or a pneumatic cylinder. The first driving member 61 in this embodiment of the present application can drive the pressing plate 62 to rotate to press the tab 12, or it can drive the pressing plate 62 to move linearly to press the tab 12.

[0119] Since the edge of the tab 12 may be warped, a certain part may be convex, or the surface may be otherwise uneven during measurement, a flattening mechanism 6 is provided to flatten the uneven parts of the tab 12 as much as possible, thereby improving the accuracy of the dimensional measurement of the tab 12 .

[0120] In some embodiments, the flattening mechanism 6 further includes a support member 63 , which is connected to the frame 4 and has an abutting plane 631 . The abutting plane 631 is used to abut against the surface of the tab 12 of the electrode assembly 1 facing away from the pressing plate 62 .

[0121] The embodiment of the present application does not limit the shape of the support member 63. Exemplarily, the support member 63 is in the shape of a plate, a block or a strip.

[0122] A support member 63 is provided to support the tab 12, which not only facilitates pressing by the pressing plate 62, but also enables the other side of the tab 12 to be pressed by the abutting plane 631, that is, both sides of the tab 12 are pressed, further improving the flatness of the tab 12, thereby improving the accuracy of the dimensional measurement of the tab 12.

[0123] FIG4 is a schematic structural diagram of a positioning mechanism and a backlight source of a size detection device according to an embodiment of the present application.

[0124] Please refer to Figure 4. In some embodiments, the size measuring device further includes a positioning mechanism 7. The positioning mechanism 7 includes a second driving member 71 and a positioning member 72. The second driving member 71 is connected to the frame 4 and is used to drive the positioning member 72 to push the workpiece to be measured to a preset position.

[0125] The embodiment of the present application does not limit the specific shape of the positioning member 72. For example, the positioning member 72 is block-shaped or plate-shaped.

[0126] The preset position of the embodiment of the present application can be determined according to factors such as the size of the workpiece to be measured, the location where the workpiece to be measured is placed, and the shooting range of the line scan camera. Optionally, the preset positions of workpieces to be measured of the same size are the same.

[0127] The embodiment of the present application does not limit the specific structure of the second driving member 71. For example, the second driving member 71 is a cylinder, a hydraulic cylinder or a linear motor. The second driving member 71 drives the positioning member 72 to perform linear motion.

[0128] The position of the workpiece to be measured is not precise when it is placed on the supporting plate 2. For example, it may have an angle or distance with the preset position. In this embodiment, the positioning mechanism 7 is used to push it to the preset position, so that the camera is taken at the preset position, which increases the accuracy of the photographed measurement results, reduces the possibility that the edge of the workpiece to be measured is not photographed due to inaccurate position, and improves the accuracy of the measurement results.

[0129] In some embodiments, the shooting range of the first line scan camera 31 covers at least the two tabs 12 of the electrode assembly 1 , and the shooting range of the second line scan camera 32 covers at least the bottom area 14 of the electrode assembly 1 .

[0130] In the embodiment of the present application, the shooting range of the first line scan camera 31 at least covers all of the two tabs 12 of the electrode assembly 1 .

[0131] The bottom region 14 includes a surface of the electrode body 11 opposite to the tab 12 .

[0132] With such an arrangement, the first line scan camera 31 can photograph the two pole ears 12, thereby obtaining the length of the pole ears 12 extending out of the top area 13 and the distance between the two pole ears 12, and can also determine the position of the connection between the pole ears 12 and the top area 13, that is, the top surface position of the electrode body 11 can be determined; the second line scan camera 32 can determine the position of the side of the bottom area 14 opposite to the pole ear 12. In this way, after knowing the top surface position and the position of the side opposite to the pole ear 12, the length of the electrode body 11 can be determined, and after knowing the size of the bottom area 14, the width of the electrode assembly 1 can be known, thereby obtaining more dimensional data of the electrode assembly 1.

[0133] FIG. 5 is a schematic diagram of the shooting range of the line scan camera of the size detection device according to an embodiment of the present application.

[0134] Please refer to FIG. 5 . In some embodiments, the first line scan camera 31 is further used to photograph the top area 13 of the electrode assembly 1 . The first line scan camera 31 covers a photographing range D1 along the third direction Z of the top area 13 , where D1 is greater than 30 mm.

[0135] In the embodiment of the present application, the top region 13 includes a surface connected to the tab 12 .

[0136] The first line scan camera 31 covers the shooting range of the top area 13 along the third direction Z, that is, the range covered by the first line scan camera 31 is the range extending from the surface of the electrode body 11 connected to the tab 12 along the third direction Z to the center of the electrode body 11 to D1.

[0137] By measuring the top area 13 , the measurement result can be matched with the measurement result of the bottom area 14 to more accurately know the length and width of the electrode body 11 , thereby further improving the accuracy of the measurement result.

[0138] If the value of D1 is too small, the range of the measured top area 13 is smaller, and the randomness of the measurement result is greater, that is, the measurement result may be greatly affected by reasons such as the folding and warping of the electrode body 11. Therefore, the shooting range of the first line scan camera 31 along the third direction Z is set to be greater than 30mm, that is, the shooting range is larger, which can reduce the influence of reasons such as folding and warping on the measurement result and improve the accuracy of the measurement result.

[0139] In some embodiments, the shooting range of the first line scan camera 31 along the third direction Z is D2, the standard size of the tab 12 along the third direction Z is D3, D2>D1+D3+K1, 5mm≤K1≤40mm.

[0140] In the embodiment of the present application, the standard size of the tab 12 along the third direction Z is the size set during the manufacture of the tab 12 , and its exact size may deviate from the standard size.

[0141] In the embodiment of the present application, K1 is a constant and can be any size between 5 mm and 40 mm.

[0142] The shooting range D3 of the first line scan camera 31 along the third direction Z is set to be greater than the sum of D1, D3 and K1, so that the coverage range of the first line scan camera 31 along the third direction Z can fully cover the tab 12 and the top area 13, thereby improving the accuracy of the algorithm edge capture processing and thus improving the accuracy of the measurement results.

[0143] In some embodiments, the shooting range of the first line scan camera 31 along the third direction Z further includes a first blank area 311 . The first blank area 311 is located on a side of the tab 12 away from the top area 13 .

[0144] The first blank area 311 of this embodiment refers to the shooting range of the first line scan camera 31 where the electrode assembly 1 is not shot.

[0145] A first blank area 311 is provided on the side of the tab 12 facing away from the top area 13 , thereby almost ensuring that the image of the tab 12 can be captured, further increasing the accuracy of the dimensional measurement of the tab 12 .

[0146] In some embodiments, the second line scan camera 32 covers a shooting range D4 of the bottom area 14 along the third direction Z, where D4>30 mm.

[0147] The second line scan camera 32 covers the shooting range of the bottom area 14 along the third direction Z. That is, the range covered by the second line scan camera 32 is from the side opposite to the tab 12 of the electrode body 11 along the third direction Z to the center of the electrode body 11 to D4.

[0148] If the value of D4 is too small, the range of the measured bottom area 14 is smaller, and the measurement result is more random, that is, the measurement result may be greatly affected by reasons such as the folded edge and warping of the electrode body 11. Therefore, the shooting range of the second line scan camera 32 along the third direction Z is set to be greater than 30mm, that is, the shooting range is larger, which can reduce the influence of reasons such as folded edge and warping on the measurement result and improve the accuracy of the measurement result.

[0149] In some embodiments, the shooting range of the second line scan camera 32 along the second direction Y is D5, D5>D4+K2, 5mm≤K2≤40mm.

[0150] K2 in the embodiment of the present application is a constant and can be any size between 5 mm and 40 mm.

[0151] The shooting range D5 of the second line scan camera 32 along the third direction Z is set to be greater than the sum of D4 and K2, so that the coverage range of the second line scan camera 32 along the third direction Z can fully cover the bottom area 14, thereby improving the accuracy of the measurement result.

[0152] In some embodiments, the shooting range of the second line scan camera 32 along the third direction Z further includes a second blank area 321 . The second blank area 321 is located on a side of the bottom area 14 away from the top area 13 .

[0153] The second blank area 321 of this embodiment refers to the shooting range of the second line scan camera 32 where the electrode assembly 1 is not shot.

[0154] A second blank area 321 is provided on the side of the bottom area 14 away from the top area 13 , thereby almost ensuring that the image of the bottom area 14 is captured, improving the accuracy of the algorithm edge processing, and thus increasing the accuracy of the bottom area 14 size measurement.

[0155] In some embodiments, the resolution of the first line scan camera 31 is Σ1, Σ1≥40*D2 / L, and L is the tolerance band width of the dimension of the electrode assembly 1 along the third direction Z.

[0156] The tolerance width of the dimension of the electrode assembly 1 along the third direction Z in the embodiment of the present application is a preset value, which is determined according to the manufacturing standard of the dimension of the electrode assembly 1 .

[0157] By linking the resolution of the first line scan camera 31 with the shooting range and the tolerance band width of the electrode assembly 1 , the resolution requirements of different electrode assemblies 1 can be met, thereby improving the accuracy of the measurement results.

[0158] In some embodiments, the resolution of the second line scan camera 32 is Σ2, Σ2≥40*D4 / L, where L is the width of the tolerance band of the dimension of the electrode assembly 1 along the third direction Z.

[0159] By linking the resolution of the second line scan camera 32 with the shooting range and the tolerance band width of the electrode assembly 1 , the resolution requirements of different electrode assemblies 1 can be met, thereby improving the accuracy of the measurement results.

[0160] In some embodiments, the movement speed of the line scan camera 3 along the second direction Y is v, 450 mm / s<v<600 mm / s.

[0161] The greater the speed of the line scan camera 3 along the second direction Y, the shorter the shooting time of each electrode assembly 1. However, if the speed of the line scan camera 3 moving along the second direction Y is too fast, frame loss will occur and the shooting quality will be poor; the slower the speed of the line scan camera 3 moving along the second direction Y, the longer the shooting time and the lower the shooting efficiency.

[0162] In view of this, setting the movement speed of the line scan camera 3 along the second direction Y to less than 600 mm / s can reduce the possibility of frame loss and improve the shooting quality; setting the speed of the line scan camera 3 along the second direction Y to greater than 450 mm / s can improve the shooting efficiency and speed up the detection speed.

[0163] Referring to Figures 1-3 , the measurement device provided in an embodiment of the present application includes a support plate 2 and a line scan camera 3. The support plate 2 is used to support the electrode assembly 1. The line scan camera 3 is positioned relative to the support plate 2 along a first direction X and is used to image the electrode assembly 1. The line scan camera 3 is configured to be movable relative to the support plate 2 along a second direction Y, with the first direction X and the second direction Y being perpendicular. The line scan camera 3 is configured to be movable.

[0164] A plurality of line scan cameras 3 are provided, including a first line scan camera 31 and a second line scan camera 32. The first line scan camera 31 and the second line scan camera 32 are arranged along a third direction Z, which intersects the second direction Y. The dimensional measurement device also includes a frame 4, on which the supporting plate 2 and the line scan cameras 3 are disposed. The dimensional measurement device also includes a backlight source 5 connected to the frame 4. The supporting plate 2 has a supporting surface 21 for supporting the electrode assembly 1 and a back surface 22 opposite the supporting surface 21. The backlight source 5 is located on the side of the back surface 22 facing away from the supporting surface 21.

[0165] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as no structural conflicts exist. The present application is not limited to the specific embodiments disclosed herein but encompasses all technical solutions within the scope of the claims.

Claims

1. A dimension measuring device, comprising: A carrying plate, used for carrying the workpiece to be measured; as well as A line scan camera is opposite to the supporting plate along a first direction and is used to photograph the workpiece to be measured. The line scan camera is configured to be movable relative to the supporting plate along a second direction, and the first direction is perpendicular to the second direction.

2. The dimension measuring device according to claim 1, wherein: The line scan camera is configured to be movable.

3. The dimension measuring device according to claim 1 or 2, wherein: The line scan cameras are provided in a plurality, and the plurality of line scan cameras include a first line scan camera and a second line scan camera; The first line scan camera and the second line scan camera are arranged along a third direction, and the third direction intersects with the second direction.

4. The dimension measuring device according to claim 3, wherein: The object to be measured is an electrode assembly.

5. The dimension measuring device according to claim 4, wherein: The electrode assembly comprises an electrode body and two electrode ears, wherein the electrode body comprises a top region and a bottom region which are arranged opposite to each other, and the two electrode ears extend from the top region; The third direction is configured to be parallel to an arrangement direction of the top region and the bottom region. 6 . The dimension measuring device according to claim 1 , further comprising a frame, wherein the supporting plate and the line scan camera are arranged on the frame.

7. The dimension measuring device according to claim 6 further comprises a backlight source connected to the frame, the supporting plate having a supporting surface for supporting the electrode assembly and a back surface opposite to the supporting surface, and the backlight source is located on the side of the back surface away from the supporting surface.

8. The dimension measuring device according to claim 7, further comprising a connecting member, wherein the connecting member is used to connect the supporting plate and the frame. The number of the backlight sources is two, a receiving space is provided between the two backlight sources, and the connecting member passes through the receiving space.

9. The dimension measuring device according to claim 6 further includes a flattening mechanism, the flattening mechanism includes a first driving member and a pressing plate, the part to be measured is an electrode assembly, the first driving member is connected to the frame and is used to drive the pressing plate to press the electrode ear of the electrode assembly.

10. The dimension measuring device according to claim 9, wherein: The flattening mechanism further includes a support member, which is connected to the frame and has a contact plane, and the contact plane is used to contact a surface of the electrode tab of the electrode assembly away from the pressing plate.

11. The dimension measuring device according to claim 6, further comprising a positioning mechanism, wherein the positioning mechanism comprises a second driving member and a positioning member, wherein the second driving member is connected to the frame and is used to drive the positioning member to push the workpiece to be measured to a preset position.

12. The dimension measuring device according to claim 5, wherein: The shooting range of the first line scan camera at least covers the two pole ears of the electrode assembly, and the shooting range of the second line scan camera at least covers the bottom area of ​​the electrode assembly.

13. The dimension measuring device according to claim 12, wherein: The first line scan camera is further used to photograph the top area of ​​the electrode assembly. The first line scan camera covers a photographing range D1 along the third direction of the top area, and D1>30 mm.

14. The dimension measuring device according to claim 13, wherein: The shooting range of the first line scan camera along the third direction is D2, the standard size of the pole ear along the third direction is D3, D2>D1+D3+K1, 5mm≤K1≤40mm.

15. The dimension measuring device according to claim 14, wherein: The shooting range of the first line scan camera along the third direction also includes a first blank area, and the first blank area is located on a side of the tab away from the top area.

16. The dimension measuring device according to claim 12, wherein: The shooting range of the second line scan camera in the bottom area along the third direction is D4, and D4>30 mm.

17. The dimension measuring device according to claim 16, wherein: The shooting range of the second line scan camera along the third direction is D5, D5>D4+K2, 5mm≤K2≤40mm.

18. The dimension measuring device according to claim 17, wherein: The shooting range of the second line scan camera along the third direction also includes a second blank area, and the second blank area is located on a side of the bottom area away from the top area.

19. The dimension measuring device according to claim 14, wherein: The resolution of the first line scan camera is Σ1, Σ1≥40*D2 / L, and L is the tolerance band width of the dimension of the electrode assembly along the third direction.

20. The dimension measuring device according to claim 17, wherein: The resolution of the second line scan camera is Σ2, Σ2≥40*D4 / L2, and L is the tolerance band width of the dimension of the electrode assembly along the third direction.

21. The dimension measuring device according to claim 1, wherein: The movement speed of the line scan camera along the second direction is v, 450mm / s<v<600mm / s. .

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