Lithium battery pole column height difference detection method and system, storage medium and industrial computer

Abstract

This invention discloses a method, system, storage medium, and industrial control computer for detecting the height difference of lithium battery terminals. The method includes the following steps: S1, acquiring real-time displacement detection data of the lithium battery top cover from a laser displacement sensor when the top cover enters the detection area; S2, analyzing the displacement detection data to obtain the toroidal displacement data and groove displacement data of the terminals on the top cover; S3, determining the height difference of the terminals based on the toroidal displacement data and groove displacement data. This method uses a laser displacement sensor to analyze the displacement monitoring data of the lithium battery top cover, and analyzes the groove displacement data and toroidal displacement data, which can effectively achieve non-contact measurement of the terminal height difference and avoid errors caused by the internal rubber ring of the terminal, eliminating misjudgments. Furthermore, this method can batch inspect lithium battery top covers, improving the speed and accuracy of lithium battery terminal height difference detection.

Description

Technical Field

[0001] This invention relates to the field of testing in new energy and intelligent industrial manufacturing, and in particular to a method, system, storage medium, and industrial control computer for detecting the height difference of lithium battery terminals. Background Technology

[0002] The lithium battery top cover has a complex and precise structure, serving the functions of energy transmission and explosion-proof pressure relief. It consists of more than 10 components, including a cover plate, positive electrode post, negative electrode post, flip plate, and explosion-proof plate. Both the positive and negative electrodes are connected to the conductor through the posts, so the posts have a significant impact on the performance of the lithium battery. The design of the posts has strict accuracy requirements for the height difference, and the assembly line production and testing environment of the battery top cover also requires extremely high detection speed for the post height difference. The requirement for both speed and accuracy makes manual and image processing methods incompatible. Currently, there is no low-cost, high-precision device that can automatically measure the post height difference in real time. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method, system, storage medium and industrial control computer for detecting the height difference of lithium battery terminals.

[0004] The technical solution adopted by this invention to solve its technical problem is: to construct a method for detecting the height difference of lithium battery terminals, the method comprising the following steps:

[0005] S1. When the lithium battery top cover enters the detection area, the displacement detection data of the lithium battery top cover is obtained in real time from the displacement sensor;

[0006] S2. Analyze the displacement detection data to obtain the annular displacement data and groove displacement data of the electrode post on the top cover of the lithium battery;

[0007] S3. Determine the pole height difference based on the toroidal displacement data and the groove displacement data.

[0008] Preferably, in the lithium battery electrode height difference detection method constructed in this invention, the method further includes:

[0009] When the lithium battery top cover is conveyed by the conveyor belt, it is determined in real time whether the lithium battery top cover enters or leaves the detection area;

[0010] If it is determined that the lithium battery top cover has entered the detection area, the data collected by the displacement sensor is valid and recorded as the displacement detection data;

[0011] If it is determined that the top cover of the lithium battery has left the detection area, the data collected by the displacement sensor is invalid.

[0012] Preferably, in the lithium battery terminal height difference detection method constructed by the present invention, the step of determining in real time whether the lithium battery top cover enters or leaves the detection area when the lithium battery top cover is conveyed by the conveyor belt includes:

[0013] When the lithium battery top cover is conveyed by the conveyor belt, the optical fiber sensor acquires the optical detection signal in real time, and determines whether the lithium battery top cover enters or leaves the detection area based on the optical detection signal.

[0014] Preferably, in the lithium battery terminal height difference detection method constructed by the present invention, step S2 includes:

[0015] S2-1. Obtain at least two consecutive minimum points in the displacement detection data and calculate the average value of the at least two consecutive minimum points; using the average value as a first baseline, obtain a first preset number of valid minimum points from the displacement detection data within a first preset filtering range to obtain the toroidal displacement data;

[0016] S2-2. Obtain at least one maximum value point from the displacement detection data. Using the at least one maximum value point as a second baseline, obtain a second preset number of consecutive valid maximum value points from the displacement detection data within a second preset filtering range to obtain the groove surface displacement data.

[0017] Preferably, in the lithium battery terminal height difference detection method constructed in this invention, the following steps are performed before step S3:

[0018] S3-0: Determine whether the tilt of the lithium battery top cover relative to the preset plane is less than or equal to the tilt threshold based on the displacement detection data. If yes, proceed to step S3. If no, perform tilt correction on the toroidal displacement data and the groove displacement data and proceed to step S3.

[0019] Preferably, in the lithium battery terminal height difference detection method constructed by the present invention, tilt correction of the toroidal displacement data and the groove displacement data includes:

[0020] Calculate the mean difference of the groove surface displacement data in the tilt direction;

[0021] Using the midpoint of the groove surface displacement data as a reference, the groove surface displacement data is divided into two parts along the inclined direction;

[0022] The average difference is added to the toroidal displacement data and the groove displacement data on the lower side of the inclination direction, and the average difference is subtracted from the toroidal displacement data and the groove displacement data on the higher side of the inclination direction.

[0023] Preferably, the lithium battery terminal height difference detection method constructed in this invention further includes the following steps:

[0024] S4. Determine whether the height difference of the pole is less than or equal to the height difference threshold. If yes, the pole is deemed qualified; otherwise, the pole is deemed unqualified.

[0025] The present invention also constructs a storage medium storing a computer program, which, when executed by a processor, implements the steps of the lithium battery terminal height difference detection method described above.

[0026] The present invention also constructs an industrial control computer, including a processor and a memory storing a computer program, wherein the processor, when executing the computer program, implements the steps of the lithium battery terminal height difference detection method described above.

[0027] This invention also constructs a lithium battery terminal height difference detection system, comprising:

[0028] The industrial control computer constructed in this invention;

[0029] Displacement sensor.

[0030] By implementing this invention, the following beneficial effects are achieved:

[0031] This invention constructs a method, system, storage medium, and industrial control computer for detecting the height difference of lithium battery terminals. The method includes the following steps: S1, when the lithium battery top cover enters the detection area, the displacement detection data of the lithium battery top cover is acquired in real time from a laser displacement sensor; S2, the displacement detection data is analyzed to obtain the toroidal displacement data and groove displacement data of the terminals on the lithium battery top cover; S3, the height difference of the terminals is determined based on the toroidal displacement data and groove displacement data. This method uses a laser displacement sensor to analyze the displacement monitoring data of the lithium battery top cover, and analyzes the groove displacement data and toroidal displacement data, which can effectively achieve non-contact measurement of the terminal height difference and avoid errors caused by the internal rubber ring of the terminal, eliminating misjudgments. Furthermore, this method can batch inspect lithium battery top covers, improving the speed and accuracy of lithium battery terminal height difference detection.

[0032] The lithium battery terminal height difference detection system constructed in this invention can be used to perform lithium battery terminal height difference detection methods, and has high detection accuracy and low cost. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the lithium battery terminal height difference detection system in the second embodiment of the present invention;

[0035] Figure 2This is a flowchart of the lithium battery terminal height difference detection method in the third embodiment of the present invention. Detailed Implementation

[0036] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] It should be noted that the flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0038] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0039] The first embodiment of the present invention discloses a lithium battery terminal height difference detection system, comprising: a data acquisition module, used to acquire displacement detection data of the lithium battery top cover from a displacement sensor in real time when the lithium battery top cover enters the detection area; a first data processing module, used to analyze the displacement detection data to acquire annular surface displacement data and groove surface displacement data of the terminal on the lithium battery top cover; and a second data processing module, used to determine the terminal height difference of the terminal based on the annular surface displacement data and the groove surface displacement data.

[0040] The displacement detection data is the data collected by the displacement sensor from the top cover as the lithium battery passes through the detection area. Generally, when a measured point passes through the detection area on the conveyor belt, for the displacement sensor, the smaller the value collected, the closer the measured point is to the displacement sensor; the larger the value collected, the closer the measured point is to the reference surface based on the conveyor belt. The displacement sensor is preferably a line laser displacement sensor, but other laser displacement sensors are also possible. In some embodiments, the displacement sensor is infrared.

[0041] The data acquisition module includes displacement sensors. A constantly lit laser displacement sensor is configured in a predetermined detection area for each of the positive and negative terminals of the lithium battery. For example, the left displacement sensor detects the positive terminal on the top cover of the lithium battery, and the right displacement sensor detects the negative terminal. This invention does not limit the number of terminals or the detection positions of the lithium battery. Having an independent displacement sensor for each terminal on the top cover of the lithium battery makes data processing more convenient.

[0042] The data acquisition module also includes a fiber optic sensor. As the lithium battery cover is conveyed via the conveyor belt, the sensor acquires optical detection signals in real time and determines whether the cover has entered or left the detection area. The fiber optic sensor can be installed above the detection area the battery will pass through, or in other installation methods and locations. After acquiring the optical detection signal, the sensor transmits it to an I / O board. The I / O board connects to the displacement sensor, the fiber optic sensor, and the industrial computer. Upon receiving the optical detection signal, the I / O board changes its voltage level and begins saving valid data. This effectively controls the validity of the acquired data, avoiding the collection of data from the conveyor belt or other obstructions.

[0043] Furthermore, the first data processing module includes a toroidal displacement data acquisition module and a groove displacement data processing module. The toroidal displacement data acquisition module and the groove displacement data processing module can be implemented by an industrial computer, connected to fiber optic sensors, displacement sensors, and I / O boards.

[0044] The toroidal displacement data acquisition module is used to acquire at least two consecutive minimum points from the displacement detection data, calculate the average of the at least two consecutive minimum points, and use the average as a reference to acquire a first preset number of valid minimum points within a first preset filtering range to obtain the toroidal displacement data. For example, it iterates through multiple minimum points in the displacement detection data identified as valid data by the IO board. Since the toroidal terminal ring of the lithium battery appears as a convex ring on the top cover of the lithium battery, it is necessary to collect multiple consecutive minimum points to calculate the average value before using this average value as a reference. After determining the reference for the toroidal displacement data, the first preset number of valid minimum points are acquired within the first preset filtering range to obtain the toroidal displacement data.

[0045] The groove surface displacement data processing module is used to obtain at least one maximum value point in the displacement detection data, and based on the at least one maximum value point, to obtain a second preset number of consecutive valid maximum value points within a second preset filtering range, thereby obtaining groove surface displacement data. For example, it iterates through the maximum value points in the displacement detection data identified as valid data by the IO board, and uses these maximum value points as a reference to continue searching for other maximum value points within a fixed fluctuation range. This fluctuation range is the aforementioned second preset filtering range, and the second preset number of consecutively obtained maximum value points are used to obtain groove surface displacement data.

[0046] The first and second preset filter ranges are determined based on the requirements of the lithium battery product being tested; they can be the same or different. The first and second preset quantities are also determined based on the requirements of the lithium battery product being tested; they can be the same or different.

[0047] It is understood that the minimum and maximum points mentioned in this invention do not specifically refer to the unique minimum and maximum values ​​among all displacement detection data. In the displacement detection data of the same pole, the values ​​of the toroidal displacement data are relatively smaller than those of the groove displacement data, and the values ​​of the groove displacement data are relatively larger than those of the toroidal displacement data. Furthermore, since the groove surface of the pole is a continuous plane that is concave relative to the groove surface, while the toroidal surface is a convex, ring-shaped surface that surrounds the groove surface, the collected data from the groove surface is continuous, while the collected data from the toroidal surface is separated by the groove surface. To determine which data belongs to the groove surface and which belongs to the toroidal surface, it is necessary to find some points of maximum or minimum value. The aforementioned minimum and maximum points refer to the points with the smallest and largest values ​​in the displacement detection data. The number of minimum points should be two or more, and the number of maximum points should be one or more.

[0048] Furthermore, to avoid detection errors caused by excessive tilt angle of the lithium battery relative to the preset plane when entering the detection area, the lithium battery terminal height difference detection system disclosed in this embodiment also includes a tilt correction module. This tilt correction module is used to determine whether the tilt angle of the lithium battery relative to the preset plane is less than or equal to a tilt angle threshold. If so, the toroidal displacement data and groove displacement data obtained from the first data processing module are directly used. If not, tilt correction is performed on the toroidal displacement data and the groove displacement data, and the second data processing module is executed.

[0049] The tilt correction of the displacement detection data includes: calculating the average difference of the groove surface displacement data at both ends of the pole in the tilt direction; taking the midpoint index of the groove surface displacement data as a reference, adding the average difference to the annular surface displacement data and the groove surface displacement data on the lower side in the tilt direction, and subtracting the average difference from the annular surface displacement data and the groove surface displacement data on the higher side in the tilt direction.

[0050] Furthermore, the second data processing module is used to determine the electrode height difference based on the toroidal displacement data and the groove displacement data. The electrode height difference can be obtained by subtracting the average value of the groove displacement data from the average value of the toroidal displacement data. Furthermore, the second data processing module is also used to determine whether the height differences of all electrodes on the top cover of the lithium battery are within the acceptable range; if so, the electrode height difference of the lithium battery is deemed acceptable.

[0051] See Figure 1The second embodiment of the present invention discloses a specific lithium battery terminal height difference detection system. This system is used to collect the terminal height difference of terminals 11 on a lithium battery 1. When the lithium battery 1 enters the detection range 3 via the conveyor belt 2, the fiber optic sensor 4 detects a change in the optical detection signal and sends this signal to the I / O board 5. Both the I / O board 5 and the displacement sensor 6 are connected to the industrial control computer 7. The displacement sensor 6 feeds back the collected data to the industrial control computer 7 in real time. The industrial control computer 7 receives the optical detection signal from the fiber optic sensor 4 after detecting that the lithium battery 1 has entered the detection range 3 and feeds it back to itself. The industrial control computer 7 records the data received after the lithium battery 1 enters the detection range 3 as displacement detection data, and analyzes the displacement detection data to obtain toroidal displacement data and groove displacement data, thereby obtaining the terminal height difference of the terminals 11. The lithium battery 1 can have two or more terminals 11, and the number of displacement sensors 6 is configured according to the number of terminals 11. Each displacement sensor 6 collects displacement detection data for one terminal 11.

[0052] See Figure 2 The third embodiment of the present invention discloses a method for detecting the height difference of lithium battery terminals, comprising the following steps:

[0053] S1. When the lithium battery top cover enters the detection area, the displacement detection data of the lithium battery top cover is acquired in real time from the displacement sensor. When the displacement sensor is a linear displacement sensor, the lithium battery or lithium battery top cover can enter the detection area by conveyor belt transportation, and the displacement detection data of each terminal on the lithium battery top cover can be collected individually.

[0054] S2. Analyze the displacement detection data to obtain the toroidal displacement data and groove displacement data of the terminals on the top cover of the lithium battery. Filter out all other data except for the toroidal displacement data.

[0055] S3. Determine the pole height difference based on the toroidal displacement data and the groove displacement data. Typically, the toroidal displacement data and the groove displacement data can be subtracted, and the absolute value of the subtraction result can be used as the pole height difference. Before subtraction, the toroidal displacement data and the groove displacement data can be further processed, such as by error correction, averaging, or error elimination.

[0056] S4. Determine if the height difference between the terminals is less than or equal to the height difference threshold. If yes, the terminal is deemed qualified; otherwise, it is deemed unqualified. This step is to determine whether each terminal on the lithium battery top cover is qualified. The height difference threshold can be adjusted according to actual needs.

[0057] S5. Determine if all terminals on the lithium battery are qualified. If yes, the lithium battery is qualified; otherwise, it is unqualified. This step is to determine if the top cover of the lithium battery is qualified. Typically, the top cover of a lithium battery includes a positive terminal and a negative terminal.

[0058] Furthermore, to minimize the collection of invalid data and reduce the difficulty of data processing, the method also includes the following steps: when the lithium battery top cover is conveyed by the conveyor belt, it is determined in real time whether the lithium battery top cover enters or leaves the detection area; if it is determined that the lithium battery top cover enters the detection area, the data collected by the displacement sensor is valid and recorded as displacement detection data; if it is determined that the lithium battery top cover leaves the detection area, the data collected by the displacement sensor is invalid. The displacement sensor remains constantly lit throughout the detection process, and whether the lithium battery top cover enters or leaves the detection area does not affect the opening and closing of the displacement sensor. The displacement detection data collected by the displacement sensor is only considered valid when the lithium battery top cover is determined to have entered the detection area; when the lithium battery top cover leaves the detection area, the data collected by the displacement sensor is considered invalid and not included in the displacement detection data.

[0059] Furthermore, to effectively control the validity of the collected data and avoid collecting data from the conveyor belt or other debris, the step of determining in real time whether the lithium battery top cover enters or leaves the detection area when it is being conveyed by the conveyor belt includes: acquiring a light detection signal from a fiber optic sensor in real time as the lithium battery top cover is being conveyed by the conveyor belt, and determining whether the lithium battery top cover has entered or left the detection area based on the light detection signal. The fiber optic sensor can be installed above the detection area through which the lithium battery will pass, or in other installation methods and positions. After the fiber optic sensor acquires the light detection signal, it transmits it to the I / O board. The I / O board connects to the displacement sensor, the fiber optic sensor, and the industrial control computer. Upon receiving the light detection signal, the I / O board changes its voltage level and begins to save valid data.

[0060] In other embodiments, the method includes the following steps: when the lithium battery top cover is conveyed by the conveyor belt, it is determined in real time whether the lithium battery top cover enters or leaves the detection area; if it is determined that the lithium battery top cover has entered the detection area, a displacement sensor is activated to acquire displacement detection data of the lithium battery top cover in real time; if it is determined that the lithium battery top cover has left the detection area, the displacement sensor is deactivated. The step of determining in real time whether the lithium battery top cover enters or leaves the detection area when it is conveyed by the conveyor belt includes: when the lithium battery top cover is conveyed by the conveyor belt, an optical detection signal is acquired in real time from an optical fiber sensor, and the determination of whether the lithium battery top cover has entered or left the detection area is based on the optical detection signal.

[0061] Further, step S2 includes: S2-1, obtaining at least two consecutive minimum points in the displacement detection data and calculating the average value of the at least two consecutive minimum points; using the average value as a first baseline, obtaining a first preset number of valid minimum points from the displacement detection data within a first preset filtering range to obtain toroidal displacement data; S2-2, obtaining at least one maximum point in the displacement detection data, using the at least one maximum point as a second baseline, obtaining a second preset number of consecutive valid maximum points from the displacement detection data within a second preset filtering range to obtain groove displacement data. The first preset filtering range can be ±(0.5mm~0.15mm); the second preset filtering range can be ±0.2mm. In some embodiments, the average value of at least two consecutive minimum points can also be used as a first lower limit or a first upper limit to obtain a first preset number of valid minimum points from the displacement detection data within a first preset filtering range to obtain toroidal displacement data; using at least one maximum point as a second lower limit or a second upper limit to obtain a second preset number of consecutive valid maximum points from the displacement detection data within a second preset filtering range to obtain groove displacement data. Specifically, the average of at least two consecutive minimum points is within the first filtering range, and at least one maximum point is within the second filtering range.

[0062] In other embodiments, step S2 may also involve analyzing the displacement detection data by calculating the gradient to find the groove surface and toroidal surface of the electrode post, so as to obtain the groove surface displacement data and toroidal surface displacement data of the electrode post on the top cover of the lithium battery by finding the starting point.

[0063] Furthermore, the above steps are based on the assumption that there is no angular deviation when the lithium battery or its top cover enters the detection area, and are standard procedure steps. When the lithium battery or its top cover is placed in the detection area with the left side higher than the right, or vice versa, the received displacement detection data will have a certain slope, and this situation needs to be handled accordingly.

[0064] To eliminate potential errors, the following steps are performed before executing step S3: S3-0: Determine whether the tilt angle of the lithium battery relative to the preset plane is less than or equal to the tilt angle threshold. If yes, proceed to step S3; otherwise, perform tilt correction on the toroidal displacement data and the groove displacement data and proceed to step S3. Tilting correction of the displacement detection data includes: calculating the average difference of the groove displacement data along the tilt direction; dividing the groove displacement data into two parts along the tilt direction using the midpoint of the groove displacement data as a reference; adding the average difference to the toroidal displacement data and groove displacement data on the lower side of the tilt direction, and subtracting the average difference from the toroidal displacement data and groove displacement data on the higher side of the tilt direction. The preset plane can be a plane perpendicular to the laser emission direction of the displacement sensor, or other planes can be selected as the preset plane according to actual needs.

[0065] The fourth embodiment of the present invention discloses a storage medium storing a computer program, which, when executed by a processor, implements the steps of the lithium battery terminal height difference detection method disclosed in the third embodiment above.

[0066] The fifth embodiment of the present invention discloses an industrial control computer, including a processor and a memory storing a computer program. When the processor executes the computer program, it implements the steps of the lithium battery terminal height difference detection method disclosed in the third embodiment.

[0067] The sixth embodiment of the present invention discloses a lithium battery terminal height difference detection system, including the industrial control computer and displacement sensor disclosed in the fifth embodiment.

[0068] By implementing this invention, the following beneficial effects are achieved:

[0069] This invention discloses a method, system, storage medium, and industrial control computer for detecting the height difference of lithium battery terminals. The method includes the following steps: S1, acquiring real-time displacement detection data of the lithium battery top cover from a laser displacement sensor when the top cover enters the detection area; S2, analyzing the displacement detection data to obtain the toroidal displacement data and groove displacement data of the terminals on the top cover; S3, determining the height difference of the terminals based on the toroidal displacement data and groove displacement data. This method uses a laser displacement sensor to analyze the displacement monitoring data of the lithium battery top cover, and analyzes the groove displacement data and toroidal displacement data, which can effectively achieve non-contact measurement of the terminal height difference and avoid errors caused by the internal rubber ring of the terminal, eliminating misjudgments. Furthermore, this method can batch inspect lithium battery top covers, improving the speed and accuracy of lithium battery terminal height difference detection.

[0070] The lithium battery terminal height difference detection system disclosed in this invention can be used to perform lithium battery terminal height difference detection methods, and has high detection accuracy and low cost.

[0071] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those skilled in the art, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention. These all fall within the protection scope of the present invention. That is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for detecting the height difference of lithium battery terminals, characterized in that, The method includes the following steps: S1. When the lithium battery top cover enters the detection area, the displacement detection data of the lithium battery top cover is acquired in real time from the displacement sensor; wherein, the displacement sensor remains constantly lit and without contact throughout the detection process, and each terminal on the lithium battery top cover is independently configured with one displacement sensor. S2. Analyze the displacement detection data to obtain the annular displacement data and groove displacement data of the electrode post on the top cover of the lithium battery; S3. Determine the pole height difference of the pole based on the toroidal displacement data and the groove displacement data; Before executing step S3, the following steps are performed: S3-0: Determine whether the tilt of the lithium battery top cover relative to the preset plane is less than or equal to the tilt threshold based on the displacement detection data. If yes, proceed to step S3. If no, perform tilt correction on the annular displacement data and the groove displacement data and proceed to step S3. Tilting correction for the toroidal displacement data and the groove displacement data includes: Calculate the mean difference of the groove surface displacement data in the tilt direction; Using the midpoint of the groove surface displacement data as a reference, the groove surface displacement data is divided into two parts along the inclined direction; The average difference between the toroidal displacement data and the groove displacement data on the lower side of the inclination direction is added, and the average difference between the toroidal displacement data and the groove displacement data on the higher side of the inclination direction is subtracted. Step S2 includes: S2-1. Obtain at least two consecutive minimum points in the displacement detection data and calculate the average value of the at least two consecutive minimum points; using the average value as a first baseline, obtain a first preset number of valid minimum points from the displacement detection data within a first preset filtering range to obtain the toroidal displacement data; S2-2. Obtain at least one maximum value point from the displacement detection data. Using the at least one maximum value point as a second baseline, obtain a second preset number of consecutive valid maximum value points from the displacement detection data within a second preset filtering range to obtain the groove surface displacement data.

2. The method for detecting the height difference of lithium battery terminals according to claim 1, characterized in that, The method also includes: When the lithium battery top cover is conveyed by the conveyor belt, it is determined in real time whether the lithium battery top cover enters or leaves the detection area; If it is determined that the lithium battery top cover has entered the detection area, the data collected by the displacement sensor is valid and recorded as the displacement detection data; If it is determined that the top cover of the lithium battery has left the detection area, the data collected by the displacement sensor is invalid.

3. The method for detecting the height difference of lithium battery terminals according to claim 2, characterized in that, The step of determining in real time whether the lithium battery top cover enters or leaves the detection area when it is being conveyed by the conveyor belt includes: When the lithium battery top cover is conveyed by the conveyor belt, the optical fiber sensor acquires the optical detection signal in real time, and determines whether the lithium battery top cover enters or leaves the detection area based on the optical detection signal.

4. The method for detecting the height difference of lithium battery terminals according to claim 1, characterized in that, It also includes the following steps: S4. Determine whether the height difference of the pole is less than or equal to the height difference threshold. If yes, the pole is deemed qualified; otherwise, the pole is deemed unqualified.

5. A storage medium storing a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the lithium battery terminal height difference detection method according to any one of claims 1 to 4.

6. An industrial control computer, comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the lithium battery terminal height difference detection method according to any one of claims 1 to 4.

7. A lithium battery terminal height difference detection system, characterized in that, include: The industrial control computer as described in claim 6; Displacement sensor.

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