Equipment for measuring gap between top cover and shell of lithium battery

Abstract

The utility model discloses equipment for measuring a gap between a top cover and a shell of a lithium battery, a product is fixedly positioned on a battery positioning carrier, a camera, a first light source and a second light source are arranged right above the battery positioning carrier from top to bottom, the first light source emits direct vertical light towards the battery product on the battery positioning carrier to form a bright field illumination environment, and the second light source emits direct vertical light towards the battery product on the battery positioning carrier. The second light source emits horizontal light above a battery on the battery positioning carrier to form a dark field illumination environment, the first light source and the second light source emit light alternately, the camera photographs battery products in the bright field illumination environment and the dark field illumination environment respectively, and a processing module of the controller captures high-contrast contour lines of two photographed pictures respectively. According to the utility model, the battery top cover and the shell are connected with the controller storage module, the gap value between the battery top cover and the shell is calculated, the calculated value is compared with the gap range data stored by the controller storage module after calculation, the obtained result is output and displayed by the measurement result output device, the measurement data is accurate, and the lithium batteries of various specifications can be compatible for accurate measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery detection, in particular to a device for measuring the gap between a lithium battery top cover and a shell. Background Art

[0002] Some lithium batteries are soft-pack batteries. During the production and transportation process, the edges of the soft-pack lithium batteries will produce slight deformation. Before the lithium battery is installed and used in an electronic device, the gap between the top cover and the shell of the lithium battery needs to be tested to avoid abnormalities in subsequent use due to excessive gap.

[0003] Currently, the gap between the top cover and the shell of a lithium battery is measured by single-light source visual imaging. Since the edge of a lithium battery is a curved surface after deformation, this imaging method results in inaccurate capture of the edge lines of the top cover and shell of the lithium battery.

[0004] Moreover, the arc angle of the lithium battery edge will vary depending on the product model. When replacing different models of lithium batteries for testing, the arc angle of the lithium battery edge will change frequently. The single light source visual imaging is poor. When grasping the arc angles of the edges of lithium batteries of various specifications, the algorithm will be unstable and inaccurate in grasping the edges, which cannot meet the customer's needs for accurate monitoring of the gap value (GAP) between the lithium battery top cover and the shell. Utility Model Content

[0005] In order to overcome the above-mentioned defects, the utility model provides a lithium battery top cover and shell gap measuring device, which can stably and accurately measure the gap between the top cover and the shell of lithium batteries of various specifications, thereby avoiding abnormalities of the lithium battery during use.

[0006] The utility model adopts a technical solution to solve its technical problems: a lithium battery top cover and shell gap measurement device, including a measurement platform, a battery positioning carrier, a measurement bracket, a camera, a first light source, a second light source, a measurement result output device and a controller, the measurement bracket and the battery positioning carrier are both installed on the measurement platform, the battery positioning carrier can fix and position the battery product to be measured, the measurement bracket is arranged on one side of the battery positioning carrier, the camera, the first light source and the second light source are sequentially installed on the measurement bracket from top to bottom, the first light source and the second light source are respectively provided with a first hollow part and a second hollow part facing the battery product on the battery positioning carrier, the camera can take a facing image of the battery product directly below it through the first hollow part and the second hollow part, the first light source emits vertical light toward the battery product below it to form a bright field lighting environment, and the second light source emits horizontal light in the horizontal direction to completely cover the area directly above the battery product A dark field lighting environment is formed by a line, the first light source and the second light source alternately illuminate the battery product located directly below the camera, the controller includes a processing module, a storage module and a control module, the camera, the first light source, the second light source and the measurement result output device communicate with the controller respectively in a wired or wireless manner, the camera can transmit the product pictures taken when the first light source illuminates the battery product and when the second light source illuminates the battery product to the processing module of the controller, the processing module of the controller captures the edge contour lines with high contrast in the two product pictures to calculate the gap between the battery top cover and the shell, the processing module of the controller can compare the calculation result with the gap range data pre-stored in the storage module of the controller, and transmit the comparison result to the measurement result output device, the measurement result output device can display the measurement result externally, and the control module of the controller controls the first light source and the second light source to turn on and off and the camera to take pictures.

[0007] As a further improvement of the present invention, the second light source includes at least one horizontal light-emitting body, which includes a translucent lampshade, a first light-emitting element and a second light-emitting element. The first light-emitting element and the second light-emitting element are fixedly installed in the translucent lampshade at an interval. The first light-emitting element and the second light-emitting element can emit horizontal light in a directed state. The horizontal light emitted by the first light-emitting element and the second light-emitting element is transmitted outward through the translucent lampshade to form a dark field lighting environment covering the battery product.

[0008] As a further improvement of the present invention, the light-transmitting lampshade includes a light-transmitting wall and a diffuse reflection wall, and the horizontal light emitted by the first light-emitting element and the second light-emitting element is diffusely reflected by the diffuse reflection wall and then emitted outwardly through the light-transmitting wall.

[0009] As a further improvement of the present invention, the second light source includes four horizontal light-emitting bodies, which are symmetrically installed on the measuring bracket, and the four horizontal light-emitting bodies form a square structure, the interior of the square structure is a second hollow portion, and the light-transmitting walls in the light-transmitting lampshades of the four horizontal light-emitting bodies form side walls of the second hollow portion, and the first light-emitting elements and the second light-emitting elements in the four horizontal light-emitting bodies are respectively tangentially irradiated along the second hollow portion, and the light of each horizontal light-emitting body is cross-covered in the internal area of ​​the second hollow portion through the light-transmitting walls of the light-transmitting lampshade.

[0010] As a further improvement of the present invention, the second light source also includes a square-shaped mounting base and an adjustment bracket. The mounting base is installed on the side wall of the measuring bracket so that its height can be adjusted in the vertical direction. The middle hollow area of ​​the mounting base is opposite to the second hollow part in the vertical direction. Four adjustment brackets are symmetrically arranged on the mounting base. The adjustment bracket includes an adjustment arm and a fixed arm. The adjustment arm is installed on the mounting base so that it can be adjusted radially along the second hollow part on a horizontal plane. Two fixed arms are respectively fixed on both sides of the adjustment arm, and the two fixed arms extend vertically in the vertical direction. One side wall of the light-transmitting lampshade of two adjacent horizontal light-emitting bodies can be respectively rotatably adjusted around a rotating axis extending horizontally parallel to the opposite direction of the first light-emitting element and the second light-emitting element and is installed on the fixed arms on both sides of the adjustment arm.

[0011] As a further improvement of the utility model, a camera bracket and a first light source bracket are also provided, and the camera bracket and the first light source bracket are respectively installed on the side wall of the measuring bracket in a vertical direction so that the height can be adjusted, and the camera and the first light source are respectively fixedly installed on the camera bracket and the first light source bracket.

[0012] As a further improvement of the present invention, it also includes a turntable, a turntable driving device and a position sensing device. The turntable can be installed on the measuring platform and can rotate around a vertical axis. The turntable driving device drives the turntable to rotate intermittently at a fixed angle. A plurality of battery positioning carriers are fixedly installed on the turntable at even intervals along the rotation direction of the turntable. The position sensing device is fixedly installed on the measuring platform. The position sensing device can sense the battery positioning carriers that are rotated to the measuring position. The position sensing device communicates with the control module of the controller via wired or wireless communication, and the control module of the controller controls the start and stop actions of the turntable driving device.

[0013] As a further improvement of the utility model, the battery positioning carrier is provided with a positioning groove matching the shape of the battery product to be measured, and the bottom surface of the positioning groove is also provided with a negative pressure pore, and the negative pressure pore is connected to the negative pressure generating device through a pipeline. The battery positioning carrier is also provided with a battery product sensing device corresponding to each positioning groove one by one, and the battery product sensing device can sense the battery product placed in the positioning groove, and the battery product sensing device communicates with the control module of the controller through wired or wireless means.

[0014] As a further improvement of the utility model, a shooting position adjustment device is further provided, and the directions perpendicular to each other on the horizontal plane are respectively X-direction and Y-direction, and the shooting position adjustment device includes an X-direction slide rail, a Y-direction slide rail, an X-direction horizontal slider, a Y-direction horizontal slider, an X-direction horizontal driving device and a Y-direction horizontal driving device, and the X-direction horizontal slider and the Y-direction horizontal slider can be respectively installed on the X-direction slide rail and the Y-direction slide rail so as to slide linearly along the X-direction and the Y-direction, and the X-direction horizontal driving device and the Y-direction horizontal driving device respectively drive the X-direction horizontal slider and the Y-direction horizontal slider to slide linearly, the Y-direction slide rail is fixedly connected to the X-direction horizontal slider, the measuring bracket is fixedly connected to the Y-direction horizontal slider, and the control module of the controller controls the start and stop actions of the X-direction horizontal driving device and the Y-direction horizontal driving device.

[0015] The beneficial effects of the utility model are as follows: the utility model selects two different light sources to illuminate the lithium battery to be measured respectively, so that the lithium battery is photographed in a bright field and a dark field environment respectively, and the processing module of the controller captures the edges of the photos obtained by the camera twice, captures the edges with high contrast, and then measures the distance of the edge line of the lithium battery top cover and the edge line of the shell to calculate the gap between the lithium battery top cover and the shell, and then realizes the measurement of the GAP size of the lithium battery product in a non-contact manner through automatic optical detection. When the utility model captures the edge line of the lithium battery top cover and the edge line of the shell, the two edge lines have high contrast, which can ensure the stability and accuracy of the edge capture and improve the accuracy of the measurement data of the gap between the lithium battery top cover and the shell, and the utility model is compatible with the size detection requirements of lithium battery products of multiple specifications, not only can it integrate multiple performance tests of the product into one, but also can realize automatic control throughout the process, the test efficiency is greatly improved, and the test quality is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a first stereoscopic view of the lithium battery top cover and shell gap measuring device of the utility model;

[0017] Figure 2 This is a second stereoscopic view of the lithium battery top cover and shell gap measuring device of the utility model;

[0018] Figure 3 This is a third stereoscopic view of the lithium battery top cover and shell gap measuring device of the utility model;

[0019] Figure 4 This is a front view of the device for measuring the gap between the top cover and the shell of a lithium battery of the utility model;

[0020] Figure 5 This is a rear view of the lithium battery top cover and shell gap measurement device of the utility model;

[0021] Figure 6It is a stereoscopic diagram of the imaging measurement state of the utility model;

[0022] Figure 7 This is the main view of the imaging measurement state of the utility model;

[0023] Figure 8 This is a right view of the imaging measurement state of the utility model;

[0024] Fig. 9 This is a rear view of the imaging measurement state of the utility model;

[0025] Fig.10 This is a three-dimensional diagram of the second light source of the utility model;

[0026] Fig.11 It is a top view of the second light source of the utility model. DETAILED DESCRIPTION

[0027] Embodiment: A lithium battery top cover and shell gap measurement device, comprising a measurement platform, a battery positioning carrier 1, a measurement bracket 2, a camera 3, a first light source 4, a second light source 5, a measurement result output device and a controller, wherein the measurement bracket 2 and the battery positioning carrier 1 are both installed on the measurement platform, the battery positioning carrier 1 can fix and position the battery product 26 to be measured, the measurement bracket 2 is arranged on one side of the battery positioning carrier 1, the camera 3, the first light source 4 and the second light source 5 are sequentially installed on the measurement bracket 2 from top to bottom, the first light source 4 and the second light source 5 are respectively provided with a first hollow portion 6 and a second hollow portion 7 facing the battery product 26 on the battery positioning carrier 1, the camera 3 can image the battery product 26 directly below it through the first hollow portion 6 and the second hollow portion 7, the first light source 4 emits vertical light toward the battery product 26 below it to form a bright field lighting environment, and the second light source 5 emits horizontal light 10 in the horizontal direction to completely cover the area directly above the battery product 26 The first light source 4 and the second light source 5 alternately illuminate the battery product 26 located directly below the camera 3. The controller includes a processing module, a storage module and a control module. The camera 3, the first light source 4, the second light source 5 and the measurement result output device communicate with the controller respectively in a wired or wireless manner. The camera 3 can transmit the product pictures taken when the first light source 4 and the second light source 5 illuminate the battery product 26 to the processing module of the controller. The processing module of the controller captures the edge contour lines with high contrast in the two product pictures to calculate the gap between the battery top cover and the shell. The processing module of the controller can compare the calculation result with the gap range data pre-stored in the storage module of the controller, and transmit the comparison result to the measurement result output device. The measurement result output device can display the measurement result externally. The control module of the controller controls the first light source 4 and the second light source 5 to turn on and off and the camera 3 to take pictures.

[0028] When measuring the gap between the top cover and the shell of a lithium battery, the battery product 26 to be measured is fixedly positioned on the battery positioning carrier 1, and the top cover of the battery is facing upward. Then, the first power supply is turned on and the second power supply is turned off. At this time, the first power supply forms a bright field environment. In the image obtained by imaging the battery product 26 by the camera 3, the edge line of the battery shell forms a high-contrast edge. The edge line of the battery shell is captured by the processing module of the controller. Then, the second power supply is turned on and the first power supply is turned off. At this time, the second power supply forms a dark field environment. In the image obtained by imaging the battery product 26 by the camera 3, the edge line of the battery top cover forms a high-contrast edge. The edge line of the battery top cover is processed by the processing module of the controller. Grab, and then the processing module of the controller will measure and calculate the distance between the edge line of the battery shell and the edge line of the battery top cover captured in the two pictures, and finally obtain the accurate gap value between the battery top cover and the shell. The device uses two different types of power supplies to form a bright field environment and a dark field environment for the battery product 26 respectively, and grabs the edges with high contrast for distance measurement, which effectively avoids the occurrence of inaccurate and unstable edge grabbing, and ensures the accuracy of the measurement of the gap value between the top cover and the shell of the lithium battery product 26. The device can be used for the measurement of the gap between the top cover and the shell of lithium batteries of various specifications, with high compatibility, accurate measurement data, high measurement efficiency, and non-contact measurement can also avoid damage or influence on the appearance of the lithium battery during the measurement process.

[0029] The second light source 5 includes at least one horizontal light emitting body 8, and the horizontal light emitting body 8 includes a light-transmitting lampshade 9, a first light-emitting element, and a second light-emitting element. The first light-emitting element and the second light-emitting element are fixedly installed in the light-transmitting lampshade 9 at intervals. The first light-emitting element and the second light-emitting element can emit horizontal light 10. The horizontal light 10 emitted by the first light-emitting element and the second light-emitting element in an opposite state passes through the light-transmitting lampshade 9 and is transmitted outward to form a dark field lighting environment covering the battery product 26. The first light-emitting element and the second light-emitting element emit horizontal light 10 in a mutually opposite manner in the light-transmitting lampshade 9. The horizontal light 10 is diffusely reflected by the light-transmitting lampshade 9 and then transmitted out, forming a dark field environment on the battery product 26, so that the edge line of the lithium battery top cover forms a high contrast, which is convenient for accurately grasping the edge line of the lithium battery top cover.

[0030] The light-transmitting lampshade 9 includes a light-transmitting wall and a diffuse reflection wall. The horizontal light 10 emitted by the first light-emitting element and the second light-emitting element is diffusely reflected by the diffuse reflection wall and then emitted outward through the light-transmitting wall. The light-transmitting lampshade 9 diffusely reflects the horizontal light 10 emitted by the first light-emitting element and the second light-emitting element through the diffuse reflection wall, and then emits the light through the light-transmitting lampshade 9 toward the light-transmitting wall of the second hollow part 7, so that the light diffuses above the battery product 26 to form a dark field environment. The first light-emitting element and the second light-emitting element are reflected oppositely, so that a large range of light is emitted outward at an obtuse angle on the light-transmitting wall of the light-transmitting lampshade 9 to prevent the situation where the light does not completely cover the product.

[0031] The second light source 5 includes four horizontal illuminants 8, which are symmetrically mounted on the measuring bracket 2, and the four horizontal illuminants 8 form a square frame structure, the interior of the square frame structure is a second hollow portion 7, the light-transmitting walls in the light-transmitting lampshades 9 of the four horizontal illuminants 8 form the side walls of the second hollow portion 7, the first light-emitting elements and the second light-emitting elements in the four horizontal illuminants 8 are respectively tangentially opposite to each other along the second hollow portion 7, and the light of each horizontal illuminant 8 is cross-covered in the internal area of ​​the second hollow portion 7 through the light-transmitting walls of the light-transmitting lampshades 9. Multiple illuminants evenly and symmetrically transmit diffusely reflected light in the direction of the battery product 26, forming a uniform dark field environment.

[0032] The second light source 5 also includes a square-shaped mounting base 11 and an adjustment bracket 12. The mounting base 11 is installed on the side wall of the measuring bracket 2 so that its height can be adjusted in the vertical direction. The middle hollow area of ​​the mounting base 11 is opposite to the second hollow portion 7 in the vertical direction. Four adjustment brackets 12 are symmetrically arranged on the mounting base 11. The adjustment bracket 12 includes an adjustment arm 13 and a fixed arm 14. The adjustment arm 13 is installed on the mounting base 11 so that it can be adjusted radially along the second hollow portion 7 on a horizontal plane. Two fixed arms 14 are respectively fixed on both sides of the adjustment arm 13, and the two fixed arms 14 extend vertically in the vertical direction. One side wall of the light-transmitting lampshade 9 of two adjacent horizontal light-emitting bodies 8 can be respectively rotatably adjusted around a rotation axis extending horizontally parallel to the irradiation direction of the first light-emitting element and the second light-emitting element and installed on the fixed arms 14 on both sides of the adjustment arm 13.

[0033] A long strip hole extending in the vertical direction can be set on the mounting seat 11, and the height of the mounting seat 11 can be adjusted by connecting screws through the long strip hole and threadedly connected to the measuring bracket 2. A horizontal long strip hole extending radially along the second hollow portion 7 can be set on the adjusting arm 13 of the adjusting bracket 12, and the radial position of the adjusting bracket 12 along the second hollow portion 7 can be adjusted by connecting screws through the horizontal long strip hole and connected to the mounting seat 11, thereby changing the radial size of the horizontal light-emitting body 8 in the second hollow portion 7, thereby adapting to the dark field lighting of batteries of different sizes and the light intensity of the dark field environment. A circular hole and an arc hole can be set on the fixed arm 14 of the adjusting bracket 12, and the connecting screws are respectively passed through the circular hole and the arc hole to connect with the side wall of the light-transmitting lampshade 9 of the horizontal light-emitting body 8, so as to adjust the inclination angle of the horizontal light-emitting body 8, thereby adjusting the light intensity and illumination angle of the dark field environment, so that the edge of the battery top cover is clearer and can adapt to the grasping of the edge line of the top cover of lithium batteries of various specifications.

[0034] A camera bracket 15 and a first light source bracket 16 are also provided, and the camera bracket 15 and the first light source bracket 16 are respectively mounted on the side wall of the measuring bracket 2 in a vertical direction so that the height can be adjusted. The camera 3 and the first light source 4 are respectively fixedly mounted on the camera bracket 15 and the first light source bracket 16. By adjusting the height of the camera bracket 15 and the first light source bracket 16 on the measuring bracket 2, the height of the camera 3 and the first light source 4 is changed, thereby making the image of the camera 3 clearer.

[0035] It also includes a turntable 17, a turntable drive device 18 and a position sensing device 19. The turntable 17 can be installed on the measuring platform to rotate around a vertical axis. The turntable drive device 18 drives the turntable 17 to rotate intermittently at a fixed angle. A number of battery positioning carriers 1 are fixedly installed on the turntable 17 at even intervals along the rotation direction of the turntable 17. The position sensing device 19 is fixedly installed on the measuring platform. The position sensing device 19 can sense the battery positioning carrier 1 that has turned to the measuring position. The position sensing device 19 communicates with the control module of the controller through wired or wireless communication. The control module of the controller controls the start and stop of the turntable drive device 18. The battery positioning carrier 1 is set on the turntable 17, which can realize the automatic delivery of lithium batteries to the measuring position without affecting the loading and unloading of the battery product 26, realizing the automatic loading detection of the battery product 26, which is conducive to efficient detection. After the battery product 26 arrives at the measuring position, it is sensed by the position sensing device 19 to ensure that the battery product 26 accurately reaches the measuring position. The position sensing device 19 can be a beam optical fiber or a contact sensor.

[0036] The battery positioning carrier 1 is provided with a positioning groove that matches the shape of the battery product 26 to be measured, and a negative pressure pore is also provided on the bottom surface of the positioning groove. The negative pressure pore is connected to the negative pressure generating device through a pipeline. The battery positioning carrier 1 is also provided with a battery product 26 sensing device corresponding to each positioning groove. The battery product 26 sensing device can sense the battery product 26 placed in the positioning groove, and the battery product 26 sensing device communicates with the control module of the controller through wired or wireless communication. The lithium battery product 26 is positioned circumferentially by the positioning groove, and the negative pressure pore negatively absorbs the bottom surface of the lithium battery product 26, ensuring that the lithium battery product 26 is stable and motionless during measurement, ensuring accurate measurement data, and avoiding contact with the side wall of the lithium battery shell, ensuring accurate measurement data.

[0037] A shooting position adjustment device is also provided. It is assumed that the directions perpendicular to each other on the horizontal plane are respectively the X direction and the Y direction. The shooting position adjustment device includes an X-direction slide rail 20, a Y-direction slide rail 21, an X-direction horizontal slider 22, a Y-direction horizontal slider 23, an X-direction horizontal driving device 24 and a Y-direction horizontal driving device 25. The X-direction horizontal slider 22 and the Y-direction horizontal slider 23 are respectively installed on the X-direction slide rail 20 and the Y-direction slide rail 21 and can slide linearly along the X direction and the Y direction. The X-direction horizontal driving device 24 and the Y-direction horizontal driving device 25 drive the X-direction horizontal slider 22 and the Y-direction horizontal slider 23 to slide linearly respectively. The Y-direction slide rail 21 is fixedly connected to the X-direction horizontal slider 22, the measuring bracket 2 is fixedly connected to the Y-direction horizontal slider 23, and the control module of the controller controls the start and stop actions of the X-direction horizontal driving device 24 and the Y-direction horizontal driving device 25. The shooting position adjusting device can be used to adjust the horizontal positions of the camera 3, the first light source 4 and the second light source 5 to ensure that they are facing the battery product 26 at the measuring position for taking pictures. The shooting position adjusting device can be automatically adjusted according to the imaging conditions of the camera 3, with high adjustment efficiency and precise adjustment.

[0038] A method for measuring the gap between a lithium battery top cover and a shell comprises the following steps:

[0039] Step 1: At the loading position, the battery product 26 to be measured is fixedly positioned on the battery positioning carrier 1 directly opposite to the loading position;

[0040] Step 2: The controller controls the turntable driving device 18 to start, and the turntable 17 rotates a set angle. When a battery positioning carrier 1 with a battery product 26 to be measured just rotates to the measuring position, the controller controls the turntable driving device 18 to stop;

[0041] Step 3: The controller controls the shooting position adjustment device to start adjusting the horizontal position of the camera 3 so that the camera 3 is just facing the battery product 26 at the measurement position;

[0042] Step 4: The first light source 4 is turned on, the second light source 5 is turned off, the battery product 26 at the measuring position is in a bright field environment, the camera 3 takes a picture of the battery product 26 and sends the taken picture to the processing module of the controller, and the processing module of the controller captures the edge line of the lithium battery shell with high contrast;

[0043] Step 5: The first light source 4 is turned off, the second light source 5 is turned on, the battery product 26 at the measuring position is in a dark field environment, the camera 3 takes a picture of the battery product 26 and sends the taken picture to the processing module of the controller, and the processing module of the controller captures the edge line of the lithium battery top cover with high contrast;

[0044] Step 6: The processing module of the controller performs distance measurement calculation on the edge line of the lithium battery shell and the edge line of the lithium battery top cover grabbed twice, and compares the calculated data with the gap range data pre-stored in the storage module of the controller. If the calculated data is within the pre-stored gap range data, the battery product 26 is determined to be qualified. If the calculated data is outside the pre-stored gap range data, the battery product 26 is determined to be unqualified. The processing module of the controller sends the measurement result to the measurement result output device, and the measurement result output device displays the measurement result externally;

[0045] Step 7: The controller controls the turntable drive device 18 to start, and the turntable 17 rotates a set angle. The measured battery product 26 is transferred to the unloading position. The workers or the unloading robot unload the measured battery product 26 according to the measurement results and place them in the qualified product area and the unqualified product area respectively. At the same time, the next battery positioning carrier 1 containing the battery product 26 to be measured is transferred to the measurement position to start measurement.

Claims

1. A lithium battery top cover and shell gap measurement device, characterized in that: The device comprises a measuring platform, a battery positioning carrier (1), a measuring bracket (2), a camera (3), a first light source (4), a second light source (5), a measurement result output device and a controller. The measuring bracket and the battery positioning carrier are both installed on the measuring platform. The battery positioning carrier can fix and position a battery product (26) to be measured. The measuring bracket is arranged on one side of the battery positioning carrier. The camera, the first light source and the second light source are sequentially installed on the measuring bracket from top to bottom. The first light source and the second light source are respectively provided with a first hollow portion (6) and a second hollow portion (7) facing the battery product on the battery positioning carrier. The camera can take a facing image of the battery product directly below it through the first hollow portion and the second hollow portion. The first light source emits vertical light toward the battery product below it to form a bright field lighting environment. The second light source emits horizontal light in the horizontal direction to completely cover the area directly above the battery product to form a dark field lighting environment. environment, the first light source and the second light source alternately illuminate the battery product located directly below the camera, the controller includes a processing module, a storage module and a control module, the camera, the first light source, the second light source and the measurement result output device communicate with the controller respectively by wired or wireless means, the camera can transmit the product pictures taken when the first light source illuminates the battery product and when the second light source illuminates the battery product to the processing module of the controller, the processing module of the controller captures the edge contour lines with high contrast in the two product pictures to calculate the gap between the battery top cover and the shell, the processing module of the controller can compare the calculation result with the gap range data pre-stored in the storage module of the controller, and transmit the comparison result to the measurement result output device, the measurement result output device can display the measurement result externally, and the control module of the controller controls the first light source and the second light source to turn on and off and the camera to take pictures.

2. The lithium battery top cover and shell gap measuring device according to claim 1, characterized in that: The second light source comprises at least one horizontal light emitter (8), the horizontal light emitter comprising a light-transmitting lampshade (9), a first light-emitting element and a second light-emitting element, the first light-emitting element and the second light-emitting element being fixedly installed in the light-transmitting lampshade at an interval, the first light-emitting element and the second light-emitting element being capable of emitting horizontal light oppositely, and the horizontal light (10) emitted by the first light-emitting element and the second light-emitting element in an oppositely emitting state is transmitted outward through the light-transmitting lampshade to form a dark field lighting environment covering the battery product.

3. The lithium battery top cover and shell gap measuring device according to claim 2, characterized in that: The light-transmitting lampshade comprises a light-transmitting wall and a diffuse reflection wall. The horizontal light emitted by the first light-emitting element and the second light-emitting element is diffusely reflected by the diffuse reflection wall and then emitted outwardly through the light-transmitting wall.

4. The lithium battery top cover and shell gap measuring device according to claim 3, characterized in that: The second light source includes four horizontal light-emitting bodies, which are symmetrically installed on the measuring bracket, and the four horizontal light-emitting bodies form a square structure, the interior of the frame structure is a second hollow part, and the light-transmitting walls in the light-transmitting lampshades of the four horizontal light-emitting bodies form side walls of the second hollow part, and the first light-emitting elements and the second light-emitting elements in the four horizontal light-emitting bodies are respectively tangentially irradiated along the second hollow part, and the light of each horizontal light-emitting body is cross-covered in the internal area of ​​the second hollow part through the light-transmitting walls of the light-transmitting lampshade.

5. The lithium battery top cover and shell gap measuring device according to claim 4, characterized in that: The second light source also includes a square frame-shaped mounting seat (11) and an adjustment bracket (12), the mounting seat being mounted on the side wall of the measuring bracket so that its height can be adjusted in the vertical direction, the middle hollow area of ​​the mounting seat being directly opposite to the second hollow portion in the vertical direction, four adjustment brackets being symmetrically arranged on the mounting seat, the adjustment bracket including an adjustment arm (13) and a fixed arm (14), the adjustment arm being mounted on the mounting seat so that it can be adjusted radially along the second hollow portion on a horizontal plane, two fixed arms being fixedly arranged on both sides of the adjustment arm, and the two fixed arms extending vertically in the vertical direction, and one side wall of the light-transmitting lampshade of two adjacent horizontal light-emitting bodies being mounted on the fixed arms on both sides of the adjustment arm so that it can be rotated and adjusted around a rotation axis extending horizontally parallel to the irradiation direction of the first light-emitting element and the second light-emitting element.

6. The lithium battery top cover and shell gap measuring device according to claim 1, characterized in that: A camera bracket (15) and a first light source bracket (16) are also provided. The camera bracket and the first light source bracket are respectively mounted on the side wall of the measuring bracket in a manner that their heights can be adjusted in the vertical direction. The camera and the first light source are respectively fixedly mounted on the camera bracket and the first light source bracket.

7. The lithium battery top cover and shell gap measurement device according to claim 1, characterized in that: It also includes a turntable (17), a turntable drive device (18) and a position sensing device (19), wherein the turntable is mounted on a measuring platform and can rotate around a vertical axis, the turntable drive device drives the turntable to rotate intermittently at a fixed angle, a plurality of battery positioning carriers are fixedly mounted on the turntable at even intervals along the direction of rotation of the turntable, the position sensing device is fixedly mounted on the measuring platform, the position sensing device can sense the battery positioning carriers that rotate to the measuring position, the position sensing device communicates with a control module of a controller via wired or wireless communication, and the control module of the controller controls the start and stop actions of the turntable drive device.

8. The lithium battery top cover and shell gap measuring device according to claim 1 or 7, characterized in that: The battery positioning carrier is provided with a positioning groove that matches the shape of the battery product to be measured. The bottom surface of the positioning groove is also provided with a negative pressure pore, and the negative pressure pore is connected to the negative pressure generating device through a pipeline. The battery positioning carrier is also provided with a battery product sensing device corresponding to each positioning groove one by one. The battery product sensing device can sense the battery product placed in the positioning groove, and the battery product sensing device communicates with the control module of the controller via wired or wireless communication.

9. The lithium battery top cover and shell gap measuring device according to claim 1, characterized in that: A shooting position adjustment device is also provided. The directions perpendicular to each other on the horizontal plane are respectively an X direction and a Y direction. The shooting position adjustment device comprises an X-direction slide rail (20), a Y-direction slide rail (21), an X-direction horizontal slider (22), a Y-direction horizontal slider (23), an X-direction horizontal driving device (24) and a Y-direction horizontal driving device (25). The X-direction horizontal slider and the Y-direction horizontal slider are respectively mounted on the X-direction slide rail and the Y-direction slide rail and can slide linearly along the X direction and the Y direction. The X-direction horizontal driving device and the Y-direction horizontal driving device respectively drive the X-direction horizontal slider and the Y-direction horizontal slider to slide linearly. The Y-direction slide rail is fixedly connected to the X-direction horizontal slider, and the measuring bracket is fixedly connected to the Y-direction horizontal slider. The control module of the controller controls the start and stop actions of the X-direction horizontal driving device and the Y-direction horizontal driving device.

Images