Method and equipment for automatically detecting number of layers of battery stacked sheets
Through the combination of a laser range measurement displacement meter and a mutation determination module, automatic detection of the number of battery stacked sheets is achieved, which solves the problems of low accuracy and low efficiency of manual detection, improves the accuracy and efficiency of detection, and adapts to different battery stacked sheets.
Patent Information
- Application Number
- CN202510952388.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-08-19
AI Technical Summary
In the prior art, the detection of the number of battery stacked sheets depends on manual operation, and there are problems such as low accuracy, high labor intensity, low efficiency, and manual recording is prone to errors.
The battery stack facade is scanned vertically by a laser ranging displacement meter, and the mutation determination module recognizes three changing modes (interlayer mutation, tight fit lamination and lamination gap) for automatic counting, and compares it with the standard model database to achieve automatic detection.
Significantly improve detection accuracy, reduce labor intensity, improve detection efficiency, adapt to battery stack sheet detection of different thicknesses and surface states, and ensure consistency in battery stack quality.
Smart Images
Figure CN120506892A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of battery detection, and in particular relates to a method and device for automatically detecting the number of battery stack layers. Background Art
[0002] In the production of new battery cell stacks, positive and negative electrode sheets (thickness 0.4mm to 0.6mm, thinnest 0.05mm, with minimal color differentiation) are manually stacked in order and quantity, then pressed into shape using a press. Inspections are performed manually in a drying room, and original inspection records are also manually entered. This manual operation has the following drawbacks:
[0003] Problems with manual stacking: The laminates are thin and similar in color. After being pressed and formed, they fit tightly together and are difficult to distinguish. It is easy for them to be over-stacked or under-stacked, resulting in poor consistency of the battery stack and difficulties in quality control and management.
[0004] Disadvantages of manual inspection: Inspectors conduct visual inspection in a drying room. The working environment is harsh, the labor intensity is high, and the eyes are easily fatigued. They are unable to accurately determine the number of stacks, which may cause unqualified battery stacks to flow into the next process, causing losses and affecting product quality.
[0005] Recording method issues: Manual entry of inspection records increases the possibility of recording errors caused by human factors. Summary of the Invention
[0006] The present invention aims to provide a method and device for automatically detecting the number of battery stack layers, so as to solve the problems in the prior art of manual detection of the number of battery stack layers, such as low accuracy, high labor intensity, low efficiency, and easy error in manual inspection records.
[0007] In a first aspect, the present invention provides a method for automatically detecting the number of battery stack layers, comprising the following steps:
[0008] S1. Retrieve the single lamination thickness T and lamination surface roughness δ from the standard model database;
[0009] S2. Scan the vertical surface of the battery stack using a laser rangefinder displacement meter. Use the mutation determination module to identify the change pattern of the measured value and perform layer counting based on the change pattern type:
[0010] Mode 1: When ΔL ≥ K × δ, it is determined to be a sudden change between layers, and the layer counter is increased by 1; K is the safety factor, K ≥ 2; ΔL is the distance difference between adjacent laminations and the displacement meter;
[0011] Mode 2: When the displacement meter continuously moves a distance S ≥ N × T and there is no sudden change, the first subsequent sudden change triggers the layer counter + N;
[0012] In the above two modes, after each mutation, the laser ranging displacement meter is reset to the starting position of the current layer, and then continuous ranging between the next layers is performed;
[0013] Mode 3: When the measured value suddenly changes to an invalid extreme value and then returns to a valid measured value, it is determined that there is a gap between adjacent laminates, and the layer counter is incremented by 1. The laser ranging displacement meter is adjusted to the initial position of the corresponding layer when the valid measured value was detected, and continuous ranging between the next layers is performed.
[0014] S3. Loop to the top layer and output the total number of layers and compare it with the standard model database.
[0015] The working principle of the present invention is:
[0016] Utilizing the principle of laser ranging, the functional stacks in the battery stack sample under inspection are precisely measured. The number of functional stack layers is determined based on the sudden changes in the detection value during the distance measurement process. This intelligent design replaces manual inspection of the number of stack layers in the battery stack. The computer stores the results of the number of stack layers for each functional stack and compares them with the number of stack layers of standard battery stacks stored in the computer's internal standard model database. Based on relevant technical requirements, the inspected battery stack sample is determined to be qualified. Unqualified battery stacks are not allowed to enter the next process.
[0017] The thickness T and surface roughness δ of a single laminate are obtained from a standard model database and used as quantitative criteria for subsequent testing. T is used to determine the theoretical cumulative thickness of successive laminates, and δ is used to define the threshold for interlaminar abrupt changes. A displacement meter scans the vertical surface of the battery stack, collecting the distance L between each laminate surface and the displacement meter in real time.
[0018] When adjacent laminates are tightly fitted with almost no gap, if the distance ΔL collected twice is ≥ K×δ (K ≥ 2 is a safety factor), it is determined to be a sudden change in the interlayer interface, and the layer counter is incremented by 1.
[0019] When adjacent laminates are tightly fitted with almost no gaps, if the continuous displacement distance S ≥ N × T and no mutation is detected, it means that there may be N laminates tightly fitted. At this time, when a mutation is detected for the first time, the counter is directly increased by N to compensate for the number of unidentified layers.
[0020] When there is a certain gap between adjacent laminates, if the gap width is greater than the ranging range of the laser ranging displacement meter and its imaging requirements, the distance value measured by the laser ranging displacement meter undergoes a huge mutation. Then, when the laser ranging displacement meter continues to move slowly in the vertical direction and re-measures valid distance data, it can be considered that the gap position between the two laminates is measured at this time. The number of layers is counted once, and the laser ranging displacement meter is adjusted to the initial position of the layer corresponding to the effective value, and continuous distance measurement is performed between the next layers. The larger the distance of the measured gap, the greater the mutation of the measured value, and the clearer the number of laminate layers can be distinguished.
[0021] The above scanning, pattern recognition, and counting operations are repeated until the top layer of the battery stack is scanned. The total number of layers is finally output and compared with the standard number of layers for the battery stack model in the standard model database to determine whether the number of battery stack layers meets the standard requirements.
[0022] The beneficial technical effects of the present invention are:
[0023] (1) Significantly improve detection accuracy
[0024] 1. Accurately identify conventional interlayer interfaces: Interlayer mutations are determined by comparing ΔL with K×δ. The quantitative judgment standard avoids the subjective errors of manual visual inspection and can accurately identify each conventional interlayer interface, greatly improving the accuracy of layer number detection and effectively reducing the problem of poor battery stack consistency caused by over- or under-stacking.
[0025] 2. Solve the problem of detecting tightly fitting stacks: Mode 2 targets tightly fitting stacks. By analyzing the relationship between continuous displacement distance and multiples of the thickness of a single stack, combined with a subsequent mutation trigger counting mechanism, it can accurately identify tightly fitting multiple stacks, avoid missing layers due to tightly fitting stacks, and ensure the reliability of the battery stack layer detection results.
[0026] 3. Capturing the gap between stacked sheets: The newly added mode 3 is specifically used to identify the gap between adjacent stacked sheets. It can promptly detect abnormal conditions during the stacking process, avoid misjudgment of the number of layers due to gap problems, further improve the accuracy and comprehensiveness of detection, and help improve the quality of battery products.
[0027] (2) Reducing labor intensity and environmental dependence
[0028] There is no need for manual visual inspection in harsh environments such as drying rooms. This automatic detection method can be operated continuously by the equipment 24 hours a day, greatly reducing the labor intensity of inspectors. At the same time, it gets rid of the dependence on manual visual inspection, reduces inspection errors caused by long-term eye fatigue, and ensures the stability and continuity of the inspection work.
[0029] (3) Significantly improve detection efficiency
[0030] The efficient cooperation of the laser ranging displacement meter and the mutation judgment module greatly improves the scanning speed, which can increase the efficiency by several times or even higher than manual inspection. It can meet the rapid inspection needs in the mass production of new battery cell stacks, effectively improve production efficiency and reduce production costs.
[0031] (4) Enhance detection adaptability
[0032] This inspection method, through the collaborative operation of three modes, can adapt to the inspection of battery stacks of varying thicknesses, surface conditions, and stacking conditions. Whether it's extremely thin stacks (as thin as 0.05mm) or stacks with subtle color distinctions that can easily cause visual confusion, it can achieve accurate inspection. Its strong versatility and adaptability provide a strong guarantee for production quality control of various battery stack models.
[0033] Furthermore, the operation of resetting the laser rangefinder displacement meter is achieved by controlling the laser rangefinder displacement meter on the lifting module through a servo motor. The servo motor drives the lifting module to accurately control the laser rangefinder displacement meter to reset to the starting position of the current layer after each interlayer mutation. The servo motor adjusts the displacement in real time through feedback from the mutation judgment module to ensure a reset accuracy of ±0.01mm, eliminate cumulative errors, and avoid distortion of subsequent scanning data due to position deviation of the laser rangefinder displacement meter. For extremely thin laminates of 0.05mm, the reset accuracy can meet the precise positioning of the interface between layers, avoiding missed layer judgments due to mechanical errors.
[0034] Furthermore, the laser distance displacement meter utilizes a color laser coaxial displacement meter. This meter emits a colored laser beam (e.g., dual-wavelength red and blue) and utilizes the principles of light interference and reflection to simultaneously acquire distance information L and color characteristics from the laminate surface. The coaxial design ensures that the laser beam strikes the laminate surface perpendicularly, reducing measurement errors caused by angular deviation. The color recognition function assists in distinguishing between laminate layers of similar colors (e.g., subtle color differences between laminates made of different materials).
[0035] In a second aspect, the present invention further provides an automatic detection device for the number of battery stack layers, which is used to implement the above detection method, including:
[0036] Standard model database, used to store the thickness T, quantity and surface roughness δ of each model of lamination;
[0037] A laser distance displacement meter is used to vertically scan the vertical surface of the battery stack to obtain the distance value L between each stack vertical surface and the laser distance displacement meter;
[0038] Lifting module, used to realize the movement of laser ranging displacement meter in the vertical plane;
[0039] Mutation determination module, used to identify the change pattern of measurement values;
[0040] a counter for performing layer counting according to a change pattern type;
[0041] The detection data storage module is used to store the data calculated by the counter.
[0042] The working principle of this device is:
[0043] 1. Data Preparation and Retrieval: The standard model database pre-stores the thickness T, standard number of layers, and surface roughness δ of each model of stack. After the equipment is started, the system automatically retrieves the corresponding parameters based on the model of the battery stack to be tested, providing a quantitative benchmark for subsequent testing.
[0044] Laser Scanning and Data Acquisition: A laser rangefinder is mounted on the lift module, scanning vertically across the stack surface. The displacement meter emits a laser beam and receives reflected light, calculating the distance L between the stack surface and the displacement meter in real time. This L data is then continuously transmitted to the mutation determination module.
[0045] 3. Change pattern recognition: The mutation determination module identifies three change patterns based on the real-time collected L and S data:
[0046] Mode 1 (interlayer mutation): Calculate the difference ΔL between adjacent L values. When ΔL ≥ K × δ (K ≥ 2), it is determined to be an interlayer interface and the count is +1.
[0047] Mode 2 (tightly fitting laminations): Monitor the continuous displacement distance S. If S ≥ N × T and there is no sudden change, record this state. The first subsequent sudden change triggers this mode, and the count is + N.
[0048] Mode 3 (gap identification): When the L value suddenly changes to an invalid extreme value (such as exceeding the range) and then returns to a valid measurement value, it is determined to be a stacking gap and the count is +1.
[0049] 4. Layer Counting and Displacement Reset: The counter performs corresponding counting according to the pattern recognized by the mutation judgment module:
[0050] Mode 1: Number of layers + 1; Mode 2: Number of layers + N; Mode 3: Number of layers + 1.
[0051] After each count, the system controls the lifting module to drive the displacement meter to reset to the starting position of the current layer (mode one / two) or adjust to the position corresponding to the valid measurement value (mode three) to ensure the accuracy of the starting point of subsequent scans.
[0052] 5. Data Storage and Comparison
[0053] After the test is completed, the counter outputs the total number of layers, and the test data storage module automatically records the test results (including the number of layers, model, time, etc.), and compares them with the theoretical number of layers in the standard model database to generate a pass / fail judgment.
[0054] The beneficial technical effects of this solution: Compared with traditional manual inspection, this equipment completely solves the problems of low accuracy, high labor intensity and low efficiency of manual inspection through the technical route of "laser scanning + intelligent judgment + automatic counting"; compared with simple mechanical inspection equipment, it recognizes three change patterns through the mutation judgment module, and realizes accurate detection of tightly fitted stacks and gap anomalies, with more comprehensive coverage of detection scenarios and higher accuracy.
[0055] This device provides an efficient and reliable solution for inspecting the number of layers in new battery stacks. It is particularly suitable for high-precision inspection of extremely thin stacks (0.05mm) and stacks of similar colors. It effectively eliminates the impact of human factors on product quality, making battery stack layer inspection more accurate and reliable, thereby improving the quality of battery stack products. It can also save inspection records for battery stack layers of different models and batches, enhancing traceability. Furthermore, through the computer system, the company can implement digital informationization for production management of battery stack layer inspection, significantly improving accuracy and production efficiency. It also reduces the time workers spend working in harsh environments, providing guidance for industry production.
[0056] Furthermore, the automatic detection equipment also includes an operating table, which includes a base and a column arranged on the base. The base is provided with a product positioning tool for placing the battery stack, and the lifting module is installed on the column. The product positioning tool is set on the base of the operating table, and the battery stack is fixed by a mechanical limiting structure (such as a slot, a magnetic device) to ensure its stable position during the detection process; the column supports the lifting module so that the displacement meter can move accurately in the vertical direction to ensure that the scanning track is perpendicular to the vertical surface of the battery stack. The positioning tool controls the position deviation of the battery stack within 0.1mm, avoids the L measurement error caused by the shaking of the workpiece, and ensures that the number of layers is calculated accurately.
[0057] Furthermore, the lifting module includes a servo motor, a screw, a nut seat, and a slide rail. The servo motor is used to drive the screw to rotate. The screw is rotatably connected to the column. The nut seat is threadedly connected to the screw and slidably connected to the slide rail. The laser ranging displacement meter is set on the nut seat. The servo motor drives the screw to rotate, driving the nut seat to move up and down along the slide rail. The displacement meter is fixed on the nut seat to achieve high-precision displacement in the vertical direction (speed control accuracy can reach 0.1mm / s, and position accuracy can reach 0.02mm). The slide rail provides rigid support to reduce shaking during movement. The scanning speed can be dynamically adjusted according to the thickness of the laminate, taking into account both detection efficiency and accuracy.
[0058] Furthermore, a grating ruler is provided on the side wall of the column, which cooperates with the lifting module to measure the vertical movement distance of the laser ranging displacement meter in real time, thereby improving the accuracy of the vertical distance movement of the laser ranging displacement meter. BRIEF DESCRIPTION OF THE DRAWINGS
[0059] Figure 1 This is a front view of an automatic detection device for the number of battery stack layers in Example 1 of the present invention.
[0060] Figure 2 This is a left view of an automatic detection device for the number of battery stack layers in Example 1 of the present invention.
[0061] Figure 3 This is a top view of an automatic detection device for the number of battery stack layers in Example 1 of the present invention.
[0062] Figure 4 This is a detection process of a method for automatically detecting the number of battery stack layers according to embodiment 2 of the present invention.
[0063] Figure 5 The detection principle is that there is no gap between the two laminations.
[0064] Figure 6 A detection mutation with no gap between the two stacks.
[0065] Figure 7 The detection principle is to detect gaps between multiple laminations.
[0066] Figure 8 Detect mutations without gaps between multiple laminations.
[0067] Figure 9 The principle of detecting a gap between two laminations.
[0068] Figure 10 A detection mutation for a gap between two stacks.
[0069] Figure 11 Detect mutations for the entire battery stack with a gap between two stacks. DETAILED DESCRIPTION
[0070] The following is further described in detail through specific implementation methods:
[0071] The figure marks in the drawings of the specification include: machine foot 1, base 2, column 3, product positioning tooling 4, lamination 5, servo motor 6, screw 7, nut seat 8, laser coaxial displacement meter 9, drag chain 10, emergency stop button 11, grating ruler 12.
[0072] Example 1: A device for automatically detecting the number of battery stack layers, used to automatically detect the number of battery stack layers, such as Figures 1 to 3 As shown, including:
[0073] The operating table includes a base 2 and a column 3 connected to the base 2. The base 2 is provided with a product positioning tool 4 for placing the battery stack 5. The surface of the product positioning tool 4 is provided with a positioning corner. The battery stack 5 to be detected rests on the positioning corner. The positioning corner and the detection light emitted by the laser coaxial displacement meter 9 are located in the same plane; four machine feet 1 are connected to the bottom of the base 2; the side wall of the column 3 away from the product positioning tool 4 is connected to a drag chain 10, which is used to protect the cables related to the equipment.
[0074] A grating ruler 12 is provided on the side wall of the column 3 close to the product positioning tool 4, which cooperates with the lifting module to measure the vertical movement distance of the laser coaxial displacement meter 9 in real time;
[0075] A standard model database for storing the thickness T, quantity, and surface roughness δ of each model of laminate 5;
[0076] The laser coaxial displacement meter 9 is used to vertically scan the vertical surface of the battery stack to obtain the distance value L between the vertical surface of each stack 5 and the laser ranging displacement meter 9;
[0077] The lifting module is used to realize the movement of the laser coaxial displacement meter 9 in the vertical plane; the lifting module includes a servo motor 6, a screw rod 7, a nut seat 8, and a slide rail. The servo motor 6 is used to drive the screw rod 7 to rotate. The screw rod 7 is rotatably connected to the column 3. The nut seat 8 is threadedly connected to the screw rod 7 and slidably connected to the slide rail. The laser coaxial displacement meter 9 is set on the nut seat 8; the servo motor 6 is connected to the counter electrical signal;
[0078] The emergency stop button 11 is electrically connected to the servo motor 6 and is used to control the operation of the servo motor 6 in emergency or special circumstances;
[0079] Mutation determination module, used to identify the change pattern of measurement values;
[0080] a counter for performing layer counting according to a change pattern type;
[0081] The detection data storage module is used to store the data calculated by the counter.
[0082] Example 2: A method for automatically detecting the number of battery stack layers, using the equipment of Example 1 for detection, the detection process is as follows Figure 4 As shown, the following modes may generally appear. Therefore, it is necessary to retrieve the relevant data of the relevant standard battery stack stored in the computer for comparison and analysis to obtain the accurate number of stratifications.
[0083] Mode 1: Two laminates are tightly pressed together (no gap): When the distance between the two laminates changes suddenly from L1 to L2, the laser coaxial displacement meter 9 counts the number of layers once and then continues to detect the next layer. The detection principle is as follows Figure 5 As shown:
[0084] The laser coaxial displacement meter 9 slowly moves upward and measures the spacing between laminate 1 as L1. It continues to move upward and measures the spacing between laminate 2 as L2. The measured spacing value undergoes a significant sudden change from L1 to L2, at which point the number of layers is counted once. The laser coaxial displacement meter 9 is automatically adjusted to the initial position of the corresponding layer and continues distance measurement between the next layers.
[0085] During the continuous measurement process, L1 and L2 may have slight changes. When the change value is not greater than the roughness of the laminate surface, it is not considered that a sudden change has occurred. The sudden change state during measurement is as follows Figure 6 shown.
[0086] Mode 2: Multiple laminates are tightly pressed together (no gap): When the laser coaxial displacement meter 9 moves upwards to a distance N times the thickness of the laminate, and the spacing suddenly changes from L1 to L2, the number of layers is counted N times. The detection principle is as follows Figure 7 As shown:
[0087] For example, when the laser coaxial displacement meter 9 slowly rises over a distance exceeding N times the thickness of the corresponding laminate, a significant change in the measured distance is clearly detected. At this time, the number of layers should be accumulated to N times and recorded in the detection results.
[0088] The laser coaxial displacement meter 9 moves slowly upward and measures the spacing between laminates 1 as L1. It continues to move slowly upward and measures the spacing between laminates 2 as L1. It then measures the spacing between laminates 4 as L1. At this point, the upward displacement distance of the laser coaxial displacement meter 9 has reached four times the thickness of the laminate. The laser coaxial displacement meter 9 moves upward and measures the spacing between laminates 5 as L2. The measured spacing value has undergone a significant sudden change from L1 to L2, indicating that the number of layers to be counted is now four. The laser coaxial displacement meter 9 automatically adjusts to the initial position of the corresponding layer and performs continuous distance measurement between the next layer.
[0089] During the continuous measurement process, L1 and L2 may have slight changes. When the change value is not greater than the roughness of the laminate surface, it is not considered that a sudden change has occurred. The sudden change state during measurement is as follows Figure 8 shown.
[0090] Mode 3: There is a gap between two stacked sheets: When the laser coaxial displacement meter 9 measures the gap position, the spacing value changes dramatically. After continuing to move, valid data is obtained again, and the number of layers is counted once. The detection principle is as follows Figure 9 As shown:
[0091] When the laser coaxial displacement meter 9 measures the gap position between two laminates, if the gap width is greater than the ranging range of the laser coaxial displacement meter 9 and its imaging requirements, the distance value measured by the laser coaxial displacement meter 9 undergoes a huge mutation. Then the laser coaxial displacement meter 9 continues to move slowly upward and re-measures valid distance data. It can be considered that the gap position between the two laminates is measured at this time, the number of layers is counted once, and the laser coaxial displacement meter 9 is automatically adjusted to the initial position of the corresponding layer to perform continuous distance measurement between the next layer. The larger the distance of the measured gap, the greater the mutation of the measured value, and the clearer the number of layers of the laminate can be distinguished.
[0092] Laser coaxial displacement meter 9 slowly moves upward and measures the spacing between laminate 1 as L1. It continues its slow upward movement until it reaches the gap between the two laminates. The measured spacing reaches an extreme value, a significant change from L1. Laser coaxial displacement meter 9 continues its slow upward movement and measures the spacing between laminate 2 as L2. From the extreme value to L2, another significant change occurs, indicating that laser coaxial displacement meter 9 has measured the gap between the two laminates once. At this point, the number of layers should be accumulated. Laser coaxial displacement meter 9 automatically adjusts to the initial position of the corresponding layer to continue measuring the distance between the next layer.
[0093] During the continuous measurement process, L1 and L2 may have slight changes. When the change value is not greater than the roughness of the laminate surface, it is not considered that a sudden change has occurred. The sudden change state during measurement is as follows Figure 10 shown.
[0094] In this mode, the measured value exceeds the measurement range of the laser coaxial displacement meter 9. For the measurement of the entire battery stack, the mutation state is as follows Figure 11 shown.
[0095] The grating ruler provides real-time feedback on the actual position of the laser coaxial displacement meter 9, ensuring:
[0096] (1) The accuracy of the judgment of "continuous displacement distance S ≥ N × T" in mode 2 is to avoid the calculation deviation of S due to the mechanical error of the lifting module and prevent the misjudgment of the number of layers of tightly fitted stacked sheets (such as misjudging N sheets as N ± 1 sheets).
[0097] (2) The laser coaxial displacement meter 9 is reset to the accuracy of the “starting position of the current layer” to ensure that the starting point of each scan is vertically aligned with the laminate surface to eliminate cumulative errors.
Claims
1. A method for automatically detecting the number of battery stack layers, characterized in that: The following steps are involved: S1. Retrieve the single lamination thickness T and lamination surface roughness δ from the standard model database; S2. Scan the vertical surface of the battery stack using a laser rangefinder displacement meter. Use the mutation determination module to identify the change pattern of the measured value and perform layer counting based on the change pattern type: Mode 1: When ΔL ≥ K × δ, it is determined to be a sudden change between layers, and the layer counter is increased by 1; K is the safety factor, K ≥ 2; ΔL is the distance difference between adjacent laminations and the displacement meter; Mode 2: When the displacement meter continuously moves a distance S ≥ N × T and there is no sudden change, the first subsequent sudden change triggers the layer counter + N; In the above two modes, after each mutation, the laser ranging displacement meter is reset to the starting position of the current layer, and then continuous ranging between the next layers is performed; Mode 3: When the measured value suddenly changes to an invalid extreme value and then returns to a valid measured value, it is determined that there is a gap between adjacent laminates, and the layer counter is incremented by 1. The laser ranging displacement meter is adjusted to the initial position of the corresponding layer when the valid measured value was detected, and continuous ranging between the next layers is performed. S3. Loop to the top layer and output the total number of layers and compare it with the standard model database.
2. The method for automatically detecting the number of battery stack layers according to claim 1, characterized in that: The operation of resetting the laser distance measuring displacement meter is achieved by controlling the laser distance measuring displacement meter on the lifting module through a servo motor.
3. The method for automatically detecting the number of battery stack layers according to claim 2, characterized in that: The laser distance measuring displacement meter adopts a color laser coaxial displacement meter.
4. An automatic detection device for the number of battery stack layers, used to implement the detection method according to claim 1, characterized in that: include: Standard model database, used to store the thickness T, quantity and surface roughness δ of each model of lamination; A laser distance displacement meter is used to vertically scan the vertical surface of the battery stack to obtain the distance value L between each stack vertical surface and the laser distance displacement meter; Lifting module, used to realize the movement of laser ranging displacement meter in the vertical plane; Mutation determination module, used to identify the change pattern of measurement values; a counter for performing layer counting according to a change pattern type; The detection data storage module is used to store the data calculated by the counter.
5. The automatic detection device for the number of battery stack layers according to claim 4, characterized in that: The operating table includes a base and a column arranged on the base. The base is provided with a product positioning tool for placing battery stacking sheets, and the lifting module is installed on the column.
6. The automatic detection device for the number of battery stack layers according to claim 5, characterized in that: The lifting module includes a servo motor, a screw rod, a nut seat, and a slide rail. The servo motor is used to drive the screw rod to rotate. The screw rod is rotatably connected to the column. The nut seat is threadedly connected to the screw rod and slidably connected to the slide rail. The laser ranging displacement meter is set on the nut seat.
7. The automatic detection device for the number of battery stack layers according to claim 5, characterized in that: The side wall of the column is provided with a grating ruler, which cooperates with the lifting module to measure the vertical movement distance of the laser ranging displacement meter in real time.