Square aluminum shell battery surface depression measuring device based on line laser scanning

Abstract

The utility model belongs to lithium ion battery technical field, concretely relates to a square aluminium shell battery surface recess measuring device based on line laser scanning, include: measuring device base, battery bearing device, sensor bearing device, battery rotating mechanism, auxiliary light source and sensor data processing unit, battery bearing device sets up on measuring device base, sensor bearing device sets up on measuring device base, battery rotating mechanism sets up on battery bearing device, auxiliary light source sets up on measuring device base, line laser measurement sensor is connected with sensor data processing unit. The device is driven by servo motor to carry out accurate relative movement in X, Y direction with line laser sensor, combines the battery clamping mechanism that can rotate 360 degrees, realizes the automation, non - contact type full - inspection of square aluminium shell battery multiple side recess.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a device for measuring surface depressions of square aluminum-cased batteries based on line laser scanning. Background Technology

[0002] In the current era of rapid development in the new energy industry, square aluminum-cased batteries have been widely used in core fields such as power batteries and energy storage batteries due to their advantages such as high energy density, strong structural stability, and wide adaptability. However, in the manufacturing process of square aluminum-cased batteries, from casing stamping and cell packaging to module assembly, various factors such as fluctuations in process parameters (such as uneven stamping pressure and welding temperature deviation), equipment precision errors, or external mechanical collisions may cause varying degrees of dents or defects on the surface or sides of the battery.

[0003] These types of dents not only directly affect the uniformity of battery appearance but also harbor serious performance and safety hazards. From a performance perspective, dents can compress the internal cell structure, disrupt the flatness of the electrode plates and the uniform distribution of the electrolyte, leading to increased internal resistance, shortened charge-discharge cycle life, and even localized lithium plating. From a safety perspective, deep dents may penetrate the aluminum casing, causing cell sealing failure, electrolyte leakage, and in extreme cases, thermal runaway, threatening the safe operation of battery applications (such as electric vehicles and energy storage power stations). Therefore, comprehensive and accurate surface dent inspection of square aluminum-cased batteries before shipment is a crucial step in ensuring battery product quality and downstream application safety.

[0004] Currently, the industry's methods for detecting surface dents in square aluminum-cased batteries are mainly divided into two categories: manual visual inspection and mechanical contact measurement. Manual visual inspection relies on the subjective experience of the inspectors, observing the battery surface for dents with the naked eye. This method is not only extremely inefficient (the inspection time for a single battery usually exceeds 3 minutes), but also cannot quantify key parameters such as dent depth and area. Furthermore, it is easily affected by factors such as personnel fatigue and lighting conditions, resulting in a high rate of false positives and false negatives, making it difficult to meet the quality control requirements of large-scale mass production scenarios.

[0005] Mechanical contact measurement, which uses tools such as height gauges, feeler gauges, and dial indicators to directly contact the battery surface for dimensional measurement, can achieve a certain degree of quantitative inspection. However, it has significant drawbacks in practical applications: Firstly, during contact measurement, the physical friction between the measuring tool and the battery surface can easily scratch the aluminum casing, damaging the battery's appearance and potentially exacerbating minor dents, resulting in "secondary damage." Secondly, this measurement method requires point-by-point positioning, with the inspection time for a single battery generally exceeding 180 seconds, which cannot match the cycle speed of automated production lines (typically requiring an inspection time of ≤30 seconds per battery), creating a production line bottleneck and restricting overall production efficiency. Furthermore, the probe size of contact measuring tools is relatively large, resulting in insufficient accuracy for detecting tiny dents (depth <0.1mm), making it difficult to meet the control standards for minute defects in high-end power batteries.

[0006] To address the pain points of traditional testing technologies, some automated testing solutions have been explored in the industry. For example, patent CN202311068037.3 proposes a device for detecting surface dents in cylindrical batteries. This device uses a clamping and rotating mechanism to rotate the cylindrical battery, coordinating with a testing mechanism to achieve automated testing. However, this solution is only designed for the curved surface of cylindrical batteries and cannot be adapted to the planar and right-angled structures of square aluminum-cased batteries. Furthermore, it does not consider the interference of ambient light on testing accuracy. Patent CN202510387022.6 combines visual and ultrasonic testing. Visual inspection is used to initially screen defective batteries, and then ultrasonic testing is used to verify the internal structure. However, ultrasonic testing mainly targets internal defects and has low accuracy in quantifying the depth of surface dents. The equipment is also expensive. Additionally, this solution requires transferring batteries via a turntable for multi-stage testing, resulting in complex processes and insufficient testing efficiency to meet the mass production requirements of square aluminum-cased batteries. Patent CN202321259595.3... The patent provides a battery sidewall dent detection fixture. The device triggers an alert by contacting the battery sidewall with a test probe. Although this can reduce manual labor intensity, it is still a contact measurement in essence, which poses a risk of scratching the battery surface. In addition, it can only detect sidewall dents and cannot cover the detection needs of the large surface of the battery (front and back).

[0007] In summary, existing testing technologies cannot fully meet the practical needs of surface dent detection for square aluminum-cased batteries in terms of adaptability, efficiency, accuracy, and non-destructiveness. Developing a surface dent measurement device for square aluminum-cased batteries that enables non-contact measurement, fully automated operation, high-precision quantification, and high-efficiency detection has become a pressing technical problem in the industry, and is of great significance for promoting quality upgrades and automation levels in the battery manufacturing industry. Utility Model Content

[0008] The purpose of this invention is to provide a device for measuring surface depressions of square aluminum-cased batteries based on line laser scanning, which aims to solve the problems of low detection efficiency, insufficient accuracy, and easy damage to batteries in existing square aluminum-cased battery surface depression measurement technologies.

[0009] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a device for measuring surface depressions of square aluminum-cased batteries based on line laser scanning, comprising: a measuring device base, a battery support device, a sensor support device, a battery rotation mechanism, an auxiliary light source, and a sensor data processing unit; The battery support device is mounted on the base of the measuring device and is used to support and move the square aluminum-cased battery to be tested. The sensor support device is mounted on the base of the measuring device and is used to support and move the line laser measuring sensor; The battery rotation mechanism is mounted on the battery support device and is used to clamp and rotate the square aluminum-cased battery to be tested; The auxiliary light source is mounted on the base of the measuring device and is used to provide illumination to the surface of the square aluminum-cased battery under test. The line laser measurement sensor is connected to the sensor data processing unit and is used to collect point cloud data of the surface of the square aluminum-cased battery under test, and transmit it to the sensor data processing unit for analysis and processing to calculate the surface indentation.

[0010] Preferably, the battery support device includes a battery support device drive motor, a battery support device drive screw, a battery support device drive nut, a battery support device slide rail slider, and a battery support device base; The battery carrier drive motor is connected to the battery carrier drive nut via the battery carrier drive screw, driving the battery carrier base to move along the Y direction.

[0011] Preferably, the sensor carrying device includes a sensor carrying device drive motor, a sensor carrying device drive screw, a sensor carrying device drive nut, a sensor carrying device slide rail slider, a sensor support column, and a sensor mounting plate; The sensor carrier drive motor is connected to the sensor carrier drive nut via the sensor carrier drive screw, driving the sensor mounting plate and the line laser measurement sensor fixed thereon to move along the X direction.

[0012] Preferably, the battery rotation mechanism includes a rotation drive motor, a drive belt, a pulley, a left clamping plate, a right clamping plate, and an opening and closing cylinder; The rotary drive motor drives the right clamping plate to rotate via the drive belt and pulley; The opening and closing cylinder is used to control the clamping and loosening of the left clamping plate and the right clamping plate to fix the square aluminum-cased battery to be tested.

[0013] Preferably, the auxiliary light source is used to enhance the contrast of the concave area on the surface of the square aluminum-cased battery under test and reduce the influence of ambient light on the linear laser measurement and imaging.

[0014] Preferably, the sensor data processing unit is configured to construct a depth map of the surface of the square aluminum-cased battery under test using point cloud data collected by the line laser measurement sensor, and obtain surface concavity data by calculating the height difference between the reference surface and the lowest point.

[0015] Preferably, the battery carrier and the sensor carrier are driven by a servo motor to realize the relative movement of the square aluminum-cased battery under test and the line laser measurement sensor in the X and Y directions, so as to complete the scanning of the entire battery surface.

[0016] Preferably, the battery rotation mechanism can rotate the square aluminum-cased battery under test by 90 degrees to switch the measurement side, so as to complete the measurement of all four sides in one loading.

[0017] Preferably, the line laser measurement sensor uses line laser triangulation to non-contactly measure the three-dimensional contour of the surface of the square aluminum-cased battery under test.

[0018] Preferably, it also includes a battery positioning strip, which is disposed on the battery carrying device for positioning the square aluminum-cased battery to be tested.

[0019] The beneficial effects of this invention are as follows: This device uses a servo motor to drive the battery carrier and the line laser sensor to perform precise relative movement in the X and Y directions. Combined with a 360-degree rotatable battery clamping mechanism, it achieves automated, non-contact, full inspection of multiple side recesses of square aluminum-cased batteries. This technical solution replaces the traditional inefficient and subjective manual visual inspection and contact measurement that is prone to secondary damage. The single measurement time is significantly reduced to a few seconds, greatly improving detection efficiency and accuracy, and meeting the high-speed cycle requirements of automated production lines.

[0020] Furthermore, the integrated auxiliary light source effectively enhances the imaging contrast of the battery surface depression features, overcomes ambient light interference, and ensures measurement stability. The 3D point cloud data generated by line laser scanning is fitted to the curved surface and the height difference is calculated through algorithms, which can accurately quantify the depression size, effectively filter out noise, and ensure the objectivity and reliability of the test results. The entire device has a compact structure and is easy to operate, significantly saving production costs while improving product quality control. Attached Figure Description

[0021] Figure 1A schematic diagram of a square aluminum-cased battery surface concavity measuring device provided by this utility model; Figure 2 A schematic diagram of the battery carrier device provided by this utility model; Figure 3 A schematic diagram of the sensor carrier device provided by this utility model; Figure 4 A schematic diagram of the battery rotation mechanism provided by this utility model; Figure 5 This is a schematic diagram of the internal structure of the back plate of this utility model; The components are as follows: 1: Measuring device base; 2: Battery carrier drive nut; 3: Battery carrier drive screw; 4: Battery carrier drive motor; 5: Battery carrier slide rail slider; 6: Battery carrier base; 7: Auxiliary light source; 8: Battery positioning strip; 9: Linear laser measurement sensor; 10: Sensor mounting plate; 11: Sensor communication cable; 12: Sensor support column; 13: Sensor support column mounting plate; 14: Sensor carrier drive nut; 15: Sensor carrier drive screw; 16: Sensor carrier drive motor; 17: Sensor carrier slide rail slider; 18: Sensor data processing unit; 19: Battery rotation mechanism; 19-1: Battery rotation mechanism base; 19-2: Rotation drive motor; 19-3: Drive belt; 19-4: Pulley; 19-5: Support plate; 19-6: 19-7: Opening / closing cylinder mounting plate; 19-8: Left clamping plate; 19-9: Right clamping plate; 19-10: Bearing; 19-11: Right clamping plate rotating shaft; 20: Square aluminum-cased battery to be tested; Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0026] refer to Figure 1 The core components of this device include a measuring device base 1, a battery support device, a sensor support device, a battery rotation mechanism 19, an auxiliary light source 7, and a sensor data processing unit 18.

[0027] The measuring device base 1 serves as the overall support foundation for the device. It is fastened to the battery carrier slide rail slider 5 of the battery carrier device, the sensor carrier slide rail slider 17 of the sensor carrier device, and the battery rotation mechanism base 19-1 of the battery rotation mechanism by bolts, ensuring the stable installation of each mechanism and providing a fixed reference for subsequent movement.

[0028] The battery support device consists of a battery support device drive nut 2, a battery support device drive screw 3, a battery support device drive motor 4, a battery support device slide rail slider 5, a battery support device base 6, and a battery positioning strip 8. The battery support device slide rail slider 5 is bolted to the measuring device base 1, and the battery support device base 6 is bolted to the slide rail slider 5, allowing it to slide along the Y direction of the slide rail slider 5. The battery support device drive nut 2 is bolted to the base 6, and the drive screw 3 is rotatably engaged with the drive nut 2. The drive motor 4 is connected to the drive screw 3 via a coupling, forming a "motor-screw-nut" transmission structure. The battery positioning strip 8 is bolted to the base 6 and is used to position and limit the battery 20 under test, preventing battery displacement during measurement.

[0029] The sensor carrier device includes a line laser measurement sensor 9, a sensor mounting plate 10, a sensor communication line 11, a sensor support column 12, a sensor support column mounting plate 13, a sensor carrier device drive nut 14, a sensor carrier device drive screw 15, a sensor carrier device drive motor 16, and a sensor carrier device slide rail slider 17. The sensor carrier device slide rail slider 17 is bolted to the measuring device base 1. The support column mounting plate 13 is connected to the slide rail slider 17 and can slide along the X direction of the slide rail slider 17. The drive nut 14 is bolted to the support column mounting plate 13, and the drive screw 15 is rotatably engaged with the drive nut 14. The drive motor 16 is connected to the drive screw 15 via a coupling, forming an X-direction transmission structure. The two ends of the sensor support column 12 are bolted to the support column mounting plate 13 and the sensor mounting plate 10, respectively. The line laser measurement sensor 9 is bolted to the mounting plate 10 and is connected to the sensor data processing unit 18 via the sensor communication line 11 to achieve data transmission.

[0030] The battery rotation mechanism 19 consists of a battery rotation mechanism base 19-1, a rotation drive motor 19-2, a drive belt 19-3, a pulley 19-4, a support plate 19-5, an opening and closing cylinder mounting plate 19-6, an opening and closing cylinder 19-7, a left clamping plate 19-8, a right clamping plate 19-9, a bearing 19-10, and a right clamping plate rotation shaft 19-11. The rotating mechanism base 19-1 is bolted to the measuring device base 1, and the support plate 19-5 is bolted to the base 19-1. The rotating drive motor 19-2 is bolted to the base 19-1 and is connected to the pulley 19-4 via the drive belt 19-3. The pulley 19-4 is keyed to the rotating shaft 19-11 of the right clamping plate. The rotating shaft 19-11 of the right clamping plate is rotatably engaged with the support plate 19-5 via the bearing 19-10. The right clamping plate 19-9 is bolted to the end of the rotating shaft 19-11. The opening and closing cylinder mounting plate 19-6 is connected to the support plate 19-5. The opening and closing cylinder 19-7 is mounted on the mounting plate 19-6, and its output end is bolted to the left clamping plate 19-8. The left clamping plate 19-8 and the right clamping plate 19-9 are arranged opposite to each other to form a battery clamping structure.

[0031] The auxiliary light source 7 is bolted to the base 6 of the battery support device, and the irradiation direction is towards the surface of the battery 20 under test; the sensor data processing unit 18 is arranged independently and is connected to the line laser measurement sensor 9 through the sensor communication line 11 for data reception and analysis.

[0032] Working principle The specific steps are as follows: Battery loading and clamping: The square aluminum-cased battery 20 to be tested is manually placed on the right clamping plate 19-9 side of the battery rotation mechanism 19. After the device is started, the opening and closing cylinder 19-7 extends and pushes the left clamping plate 19-8 to move to the right, cooperating with the right clamping plate 19-9 to clamp the battery 20. At the same time, the battery positioning strip 8 assists in positioning the battery to be tested, ensuring that the battery position is stable and avoiding displacement during the measurement process from affecting the accuracy of the data.

[0033] According to the thickness specification of the battery 20 to be tested, the sensor carrier drive motor 16 starts, and drives the sensor carrier drive screw 15 to rotate through the coupling. The drive screw 15 cooperates with the drive nut 14 to drive the sensor support column mounting plate 13 to move along the X direction of the slide rail slider 17 of the sensor carrier, thereby adjusting the position of the line laser measurement sensor 9 so that the sensor measurement range accurately covers the battery thickness direction and meets the measurement adaptation requirements of batteries of different specifications.

[0034] Auxiliary light source 7 is turned on to enhance the contrast between the concave area and the normal area on the surface of battery 20, reducing the interference of ambient light on imaging. Subsequently, the battery carrier drive motor 4 is started, which drives the battery carrier drive screw 3 to rotate through the coupling. The drive nut 2 drives the battery carrier base 6 to move along the Y direction of the battery carrier slide rail slider 5, thereby driving the battery rotation mechanism 19 and the battery under test to move at a constant speed along the Y direction. The line laser measurement sensor 9 works synchronously, emitting a line laser to the battery surface to capture the point cloud data of the battery surface along the Z direction of the concavity depth, and transmits it to the sensor data processing unit 18 in real time through the sensor communication line 11. When the battery moves to a set distance along the Y direction, the battery carrier drive motor 4 stops, the sensor completes the data acquisition of the current area, and then the motor starts again to drive the battery to continue moving, repeating the above process until the complete point cloud data acquisition of the current side of the battery is completed.

[0035] After the current side measurement is completed, the battery support device drive motor 4 drives the battery back to the initial Y direction position; the rotation drive motor 19-2 starts, and drives the pulley 19-4 to rotate through the drive belt 19-3. The pulley 19-4 drives the right clamping plate rotation shaft 19-11 and the right clamping plate 19-9 to rotate, thereby driving the clamped battery under test 20 to rotate 90°, completing the measurement surface switching; repeat the point cloud data acquisition process in step 3 to complete the point cloud data acquisition of the remaining 3 sides of the battery in sequence.

[0036] After receiving point cloud data from all sides, the sensor data processing unit 18 processes the data using a built-in algorithm, fits and constructs a reference feature surface on the battery surface, calculates the height difference between the reference surface and the lowest point of each depression area, and obtains key dimensional data such as the depth and area of ​​each depression. Finally, the system automatically outputs the measurement results to determine whether the battery meets the quality standards, and completes data storage for subsequent quality traceability.

[0037] For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A device for measuring surface depressions of a square aluminum-cased battery based on line laser scanning, characterized in that, include: Measuring device base (1), battery support device, sensor support device, battery rotation mechanism (19), auxiliary light source (7) and sensor data processing unit (18). The battery support device is mounted on the base (1) of the measuring device and is used to support and move the square aluminum-cased battery (20) to be tested. The sensor support device is mounted on the base (1) of the measuring device and is used to support and move the line laser measuring sensor (9). The battery rotation mechanism (19) is mounted on the battery support device and is used to clamp and rotate the square aluminum-cased battery (20) to be tested. The auxiliary light source (7) is mounted on the base (1) of the measuring device and is used to provide illumination to the surface of the square aluminum-cased battery (20) to be tested; The line laser measurement sensor (9) is connected to the sensor data processing unit (18) via the sensor communication line (11) to collect point cloud data on the surface of the square aluminum-cased battery (20) to be tested, and transmit it to the sensor data processing unit (18) for analysis and processing to calculate the surface indentation.

2. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The battery support device includes a battery support device drive motor (4), a battery support device drive screw (3), a battery support device drive nut (2), a battery support device slide rail slider (5), and a battery support device base (6). The battery carrier drive motor (4) is connected to the battery carrier drive nut (2) through the battery carrier drive screw (3), driving the battery carrier base (6) to move along the Y direction; The slide rail slider (5) of the battery carrier device is connected to the base (1) of the measuring device and is used to guide the movement of the base (6) of the battery carrier device.

3. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The sensor carrier device includes a sensor carrier drive motor (16), a sensor carrier drive screw (15), a sensor carrier drive nut (14), a sensor carrier slide rail slider (17), a sensor support column (12), a sensor support column mounting plate (13), and a sensor mounting plate (10). The sensor carrier drive motor (16) is connected to the sensor carrier drive nut (14) through the sensor carrier drive screw (15), driving the sensor support column mounting plate (13) to move along the X direction; The slide rail slider (17) of the sensor carrier device is connected to the base (1) of the measuring device and is used to guide the movement of the sensor support column mounting plate (13); The line laser measurement sensor (9) is fixed to the sensor support column (12) by the sensor mounting plate (10).

4. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The battery rotation mechanism (19) includes a rotation drive motor (19-2), a drive belt (19-3), a pulley (19-4), a left clamping plate (19-8), a right clamping plate (19-9), and an opening and closing cylinder (19-7). The rotary drive motor (19-2) drives the right clamping plate rotation shaft (19-11) through the drive belt (19-3) and pulley (19-4), causing the right clamping plate (19-9) to rotate; The opening and closing cylinder (19-7) is used to control the clamping and loosening of the left clamping plate (19-8) and the right clamping plate (19-9) to fix the square aluminum-cased battery (20) to be tested.

5. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The auxiliary light source (7) is disposed on the battery carrier to enhance the contrast of the concave area on the surface of the square aluminum-cased battery (20) under test.

6. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The sensor data processing unit (18) is configured to construct a depth map of the surface of the square aluminum-cased battery (20) to be tested using the point cloud data collected by the line laser measurement sensor (9), and obtain surface concavity data by calculating the height difference between the reference surface and the lowest point.

7. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The battery carrier and the sensor carrier are driven by a servo motor to realize the relative movement of the square aluminum-cased battery (20) under test and the line laser measurement sensor (9) in the X and Y directions, so as to complete the scanning of the entire battery surface.

8. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The battery rotation mechanism (19) can rotate the square aluminum-cased battery (20) to be tested by 90 degrees to switch the measurement side and realize the measurement of four sides in one loading.

9. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, The line laser measurement sensor (9) uses the line laser triangulation method to non-contactly measure the three-dimensional contour of the surface of the square aluminum-cased battery (20) to be tested.

10. The square aluminum-cased battery surface concavity measuring device according to claim 1, characterized in that, It also includes a battery positioning strip (8), which is set on the battery carrier and used to position the square aluminum-cased battery (20) to be tested.

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