System, method and apparatus for detecting folding defect of secondary battery

Abstract

The invention relates to a system, a method and a device for detecting folding defects of a secondary battery. A method for detecting a folding defect of a secondary battery according to one embodiment of the present disclosure may comprise the steps of: measuring, by a laser scanner, a height of a folding portion of a secondary battery transferred by a transfer device and a height of a pouch case in each specified section; determining whether or not there is an interval in which the height of the folded portion is greater than the height of the pouch case by a predetermined reference value or more; and determining that the folding defect has occurred when there is an interval in which the height of the folding portion is greater than the height of the pouch case by the reference value or more.

Description

Technical Field

[0001] The present disclosure relates to a system, method, and apparatus for detecting a folding defect of a secondary battery. Background Art

[0002] Secondary batteries are batteries that can be repeatedly charged and discharged. With the development of the information communications and display industries, secondary batteries are widely used as power sources for portable electronic communication devices such as cameras, mobile phones, smartphones, tablet computers, and laptop computers. Furthermore, battery packs consisting of multiple battery modules are being developed to utilize secondary batteries as power sources for environmentally friendly vehicles such as electric vehicles.

[0003] On the other hand, various defects may occur during the manufacture of secondary batteries. For example, in the case of pouch-type secondary batteries, if a folded portion (e.g., a portion sealed to seal the pouch cell) protrudes beyond the surface of the pouch cell, defects may occur during the assembly of the secondary battery (e.g., module assembly). To prevent defects during assembly, optical systems are currently used to detect folding defects in secondary batteries after manufacture, where the folded portion protrudes beyond the surface of the pouch cell. For example, this is detected by using a camera to capture the outline of the folded portion and the pouch cell and analyzing the captured image.

[0004] However, the optical system has a problem in that it is difficult to identify (eg, measure) the height of the pouch cell and the folded portion based on an image captured by a camera due to shadows caused by the contour of the pouch cell and the curvature in the folded portion. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] According to one aspect of the present disclosure, a system, method, and apparatus for detecting a folding defect of a secondary battery that improve the accuracy of detecting the folding defect may be provided.

[0007] According to another aspect of the present disclosure, a system, method, and apparatus for detecting a folding defect of a secondary battery that improve stability in detecting the folding defect may be provided.

[0008] (2) Technical solution

[0009] According to one embodiment of the present disclosure, a method for detecting a folding defect of a secondary battery may include the following steps: measuring the height of the folding portion and the height of the bag-shaped shell of the secondary battery being transferred by a transfer device in each specified interval by a laser scanner; confirming whether there is an interval in which the height of the folding portion is greater than the height of the bag-shaped shell by more than a specified reference value; and when there is an interval in which the height of the folding portion is greater than the height of the bag-shaped shell by more than the reference value, determining that the folding defect has occurred.

[0010] According to one embodiment, the laser scanner may be fixedly mounted above a track of the transfer device. During the measurement step, the carrier rack on which the secondary battery is mounted may move along the track at a specified speed and pass under the laser scanner.

[0011] According to one embodiment, a portion of an area within a measurement range of the laser scanner may be pre-set as a region of interest. The measuring step may include the following steps: measuring the height of the bag-shaped housing through a first region of interest within the region of interest, and measuring the height of the folding portion through a second region of interest within the region of interest.

[0012] According to one embodiment, the measuring step may include the following steps: starting the measurement when the secondary battery is sensed in the region of interest, and ending the measurement when the secondary battery is not sensed in the region of interest.

[0013] According to one embodiment, the measuring step may include measuring the height of the folded portion and the height of the pouch case at each designated section along a length direction of the secondary battery.

[0014] According to one embodiment, the measuring step may include the following steps: determining the maximum value among the heights of the folding portion measured in each interval as the height of the folding portion of the corresponding interval, and determining the maximum value among the heights of the bag-shaped shell measured in each interval as the height of the bag-shaped shell of the corresponding interval.

[0015] According to one embodiment, the method may further include the step of displaying and outputting the determined height of the folded portion and the determined height of the pouch in a graph.

[0016] According to one embodiment, the method may further include the following step: when it is determined that the folding defect has occurred, issuing an alarm in a specified manner.

[0017] According to one embodiment of the present disclosure, an apparatus for detecting folding defects of a secondary battery may include: a laser scanner for emitting laser light at a specified scanning rate within a specified range and receiving reflected laser light; and a processor for controlling the laser scanner to measure the height of the folded portion and the height of the bag-shaped shell of the secondary battery being transferred by a transfer device in each specified interval, confirming whether there is an interval in which the height of the folded portion measured by the laser scanner is greater than the height of the bag-shaped shell by more than a specified reference value, and when there is an interval in which the height of the folded portion is greater than the height of the bag-shaped shell by more than the reference value, it is determined that the folding defect has occurred.

[0018] According to one embodiment, the laser scanner may be fixedly mounted above a track of the transfer device, and the processor may measure the height of the folded portion and the height of the pouch-shaped housing when the carrier rack with the secondary battery mounted thereon moves along the track at a specified speed and passes under the laser scanner.

[0019] According to one embodiment, a portion of an area within a measurement range of the laser scanner may be pre-set as a region of interest. The processor may measure the height of the pouch-shaped housing through a first region of interest in the region of interest, and may measure the height of the folding portion through a second region of interest in the region of interest.

[0020] According to one embodiment, when the processor senses the secondary battery in the area of interest, the measurement may be started, and when the processor does not sense the secondary battery in the area of interest, the measurement may be ended.

[0021] According to one embodiment, the processor may measure the height of the folded portion and the height of the pouch case at each designated section along a length direction of the secondary battery.

[0022] According to one embodiment, the processor may determine the maximum value among the heights of the folding portion measured in each interval as the height of the folding portion of the corresponding interval, and determine the maximum value among the heights of the bag-shaped shell measured in each interval as the height of the bag-shaped shell of the corresponding interval.

[0023] According to one embodiment, the apparatus may further include: a display that graphically outputs the determined height of the folded portion and the determined height of the pouch-shaped housing.

[0024] According to one embodiment, the device may further include: an alarm module configured to issue an alarm in a specified manner when the folding defect occurs.

[0025] According to one embodiment of the present disclosure, a system for detecting a folding defect of a secondary battery may include: a conveying device for conveying the secondary battery; a laser scanner fixedly arranged on one side of the conveying device for measuring the height of the folded portion and the height of the bag-shaped shell of the secondary battery in each specified interval when the secondary battery is conveyed by the conveying device; and a detection device for detecting whether the folding defect occurs based on the height of the folded portion and the height of the bag-shaped shell measured by the laser scanner.

[0026] (3) Beneficial effects

[0027] According to one embodiment, the present disclosure can improve the accuracy of detecting folding defects. For example, the present disclosure can use a laser scanner that is less restricted by the measurement environment (e.g., shadows) to measure the height of the folded portion and the height of the pouch, thereby accurately detecting folding defects.

[0028] Furthermore, the present disclosure can improve the stability of folding defect detection. For example, the present disclosure can stably move the secondary battery through a transfer device while the laser scanner is fixed, and measure the height of the folded portion and the height of the pouch case, thereby reliably detecting folding defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1a and Figure 1b is a diagram schematically illustrating a system for detecting a folding defect of a secondary battery according to an embodiment of the present disclosure.

[0030] Figure 2 FIG. 1 is a diagram for explaining a method of measuring the heights of a folded portion and a pouch case of a secondary battery using a laser scanner according to one embodiment of the present disclosure.

[0031] Figure 3 FIG. 1 is a diagram for explaining a method of measuring the heights of a folded portion and a pouch case of a secondary battery using a laser scanner according to one embodiment of the present disclosure.

[0032] Figure 4 FIG. 1 is a diagram illustrating an example of setting intervals for measuring the folding height of a secondary battery and the height of a pouch case according to an embodiment of the present disclosure.

[0033] Figure 5 is a graph illustrating the height of the folded portion and the height of the pouch case when a folding defect does not occur according to one embodiment of the present disclosure.

[0034] Figure 6 is a graph illustrating the height of the folded portion and the height of the pouch case when a folding defect occurs according to one embodiment of the present disclosure.

[0035] Figure 7is a block diagram illustrating a configuration of an apparatus for detecting a folding defect of a secondary battery according to one embodiment of the present disclosure.

[0036] Figure 8 is a flowchart for explaining a method of detecting a folding defect of a secondary battery according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. However, this is merely exemplary, and the present disclosure is not limited to the specific embodiments described exemplarily.

[0038] Although terms such as first and second are used to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are only used to distinguish one element, component, or part from another element, component, or part. Therefore, within the scope of the technical concept of the present disclosure, the first element, first component, or first part mentioned below may also be the second element, second component, or second part.

[0039] The terms used in this specification are intended to describe the embodiments rather than to limit the present disclosure. Unless otherwise specified, the singular forms used in this specification include the plural forms. The use of "comprises" and / or "made of" in this specification indicates that the components, steps, operations, and / or elements mentioned do not exclude the presence or addition of one or more other components, steps, operations, and / or elements.

[0040] Unless otherwise defined, all terms (including technical and scientific terms) used in this specification are used in accordance with the meanings commonly understood by those skilled in the art in the art to which this disclosure pertains. Furthermore, unless otherwise specifically defined, terms defined in commonly used dictionaries should not be interpreted in an idealistic or overly interpreted manner.

[0041] Figure 1a and Figure 1b is a diagram schematically illustrating a system for detecting a folding defect of a secondary battery according to an embodiment of the present disclosure, Figure 2 is a diagram for explaining a method of measuring the heights of a folded portion and a pouch case of a secondary battery using a laser scanner according to one embodiment of the present disclosure. Figure 3 is a diagram for explaining a method of measuring the heights of a folded portion and a pouch case of a secondary battery using a laser scanner according to one embodiment of the present disclosure. Figure 4 is a diagram showing an example of setting intervals for measuring the folded height of a secondary battery and the height of a pouch case according to an embodiment of the present disclosure, Figure 5 is a graph showing the height of the folded portion and the height of the pouch case when no folding defect occurs according to one embodiment of the present disclosure, Figure 6 is a graph illustrating the height of the folded portion and the height of the pouch case when a folding defect occurs according to one embodiment of the present disclosure.

[0042] Before a detailed description, the structure of the pouch-type secondary battery 30 will be briefly described. The secondary battery 30 may include a pouch-shaped casing 31, a positive electrode tab 32, a negative electrode tab 33, and a folded portion 34. The pouch-shaped casing 31 forms the exterior of the secondary battery 30 and may include (e.g., house) an electrode assembly (not shown) consisting of a positive electrode, a separator, and a negative electrode. For example, the pouch-shaped casing 31 may include a space (e.g., a main chamber) for accommodating the electrode assembly. The positive electrode tab 32 is connected to the positive electrode of the electrode assembly, and a portion of the positive electrode tab 32 may be exposed outside the pouch-shaped casing 31. The negative electrode tab 33 is connected to the negative electrode of the electrode assembly, and a portion of the negative electrode tab 33 may be exposed outside the pouch-shaped casing 31. The folded portion 34 may be formed by folding at least once a flap portion of the pouch-shaped casing 31 (e.g., the portion where the upper casing 31a and the lower casing 31b are bonded). Alternatively, the pouch-shaped casing 31 may be referred to as a pouch-shaped cell, a pouch-shaped film, or a cell casing.

[0043] Reference Figures 1a to 6 A system 1000 for detecting a folding defect of a secondary battery 30 (hereinafter referred to as a detection system) according to an embodiment of the present disclosure may include a detection device 100 and a transfer device 200 .

[0044] The transfer device 200 can transfer the secondary battery 30. For example, the transfer device 200 can control the transfer of the secondary battery 30 during the manufacturing process according to the process procedure for manufacturing the secondary battery 30. In addition, the transfer device 200 can control the transfer of the secondary battery 30 (for example, moving the secondary battery 30 to the lower part of the inspection device 100) to inspect the secondary battery 30 (for example, to detect folding defects). The transfer device 200 may include a linear motion system (LMS). The transfer device 200 may include a track 210 that forms a movement path and a carrier 220 that moves along the track 210. The secondary battery 30 is placed on the upper surface of the carrier 220.

[0045] The inspection device 100 can detect defects in the secondary battery 30. For example, the inspection device 100 can use a laser scanner located above the rail 210 to measure the height H1 of the pouch-shaped casing 31 and the height H2 of the folded portion 34 of the secondary battery 30 placed on the carrier 220 and transported. Based on the measured heights H1 and H2, the inspection device 100 can detect whether the secondary battery 30 has a folding defect. When the height H2 of the folded portion 34 is greater than the height H1 of the pouch-shaped casing 31 by a specified reference value (e.g., a value greater than "0"), the inspection device 100 can determine that a folding defect exists. When the inspection device 100 determines that a folding defect exists, it can issue an alarm in a specified manner. By measuring the heights H1 and H2 of the pouch-shaped casing 31 and the folded portion 34 using a laser scanner that is not restricted by the measurement environment (e.g., shadows) and can measure heights in micrometers, the inspection device 100 can accurately detect (e.g., improve accuracy) the presence of a folding defect.

[0046] According to one embodiment, the detection device 100 can continuously or discretely measure the height of the pouch case 31 and the height of the folded portion 34 along the length direction (e.g., X-axis direction) of the secondary battery 30. To this end, the laser scanner of the detection device 100 can be fixedly installed above the track 210 of the transfer device 200. Figure 1b As shown, the transfer device 200 can move the carrier 220 with the secondary battery 30 placed thereon along the track 210 at a specified speed so that it passes under the laser scanner. Figure 2 The laser scanner of inspection device 100 is shown moving in the direction of arrow 201. This is merely for illustration purposes, as it measures the height of pouch-shaped casing 31 and the height of folded portion 34 along the length of secondary battery 30. In practice, the laser scanner is fixed above carrier 220, which transports secondary battery 30 in the direction opposite to arrow 201. With the laser scanner fixed, inspection device 100 can measure height H1 of pouch-shaped casing 31 and height H2 of folded portion 34 of secondary battery 30, which is being stably transported by transport device 200. This allows for stable detection of folding defects (e.g., improved reliability).

[0047] The detection device 100 can measure the height of the bag-shaped housing 31 and the height of the folding portion 34 starting from the time when the secondary battery 30 is sensed in a designated area (hereinafter referred to as the "interest area") within the measurement range of the laser scanner. When the secondary battery 30 is not sensed in the interest area (or when the secondary battery 30 is not sensed for more than a designated time), the measurement of the height of the bag-shaped housing 31 and the height of the folding portion 34 can be terminated. Figure 2 and Figure 3As shown, the region of interest can be set to have a specified width (for example, in the Y-axis direction) 301 based on the boundary between the bag-shaped shell 31 and the folding portion 34, and a specified depth (for example, in the Z-axis direction) 302 based on the upper surface of the bag-shaped shell 31. The width 301 may include a first width 301a and a second width 301b. The first width 301a and the second width 301b may have the same size or different sizes. The depth 302 may include a first depth 302a and a second depth 302b. The first depth 302a and the second depth 302b may have the same size or different sizes. Here, the first width 301a and the depth 302 may be the first region of interest for measuring the height H1 of the bag-shaped shell 31, and the second width 301b and the depth 302 may be the second region of interest for measuring the height H2 of the folding portion 34.

[0048] The detection device 100 can measure the height H1 of the pouch case 31 and the height H2 of the folded portion 34 at each designated interval along the length direction of the secondary battery 30. Figure 4 As shown, the detection device 100 can divide the length of the secondary battery 30 (e.g., the length of the pouch-shaped housing 31) into a specified number (e.g., 32) of intervals and measure the height H1 of the pouch-shaped housing 31 and the height H2 of the folded portion 34 in each interval. The specified number can be determined by considering the scanning rate of the laser scanner, the moving speed of the carrier 220, and the length of the secondary battery 30.

[0049] On the other hand, the height of the bag-shaped housing 31 and the height of the folding portion 34 may be measured multiple times in each section. For example, when the scanning rate of the laser scanner is fast or the movement speed of the carrier 220 is slow relative to the size (e.g., length) of each section, the height of the bag-shaped housing 31 and the height of the folding portion 34 may be measured multiple times in each section. In this case, the detection device 100 may determine the maximum value of the heights of the bag-shaped housing 31 measured in each section as the height H1 of the bag-shaped housing 31 in the corresponding section, and may determine the maximum value of the heights of the folding portion 34 measured in each section as the height H2 of the folding portion 34 in the corresponding section.

[0050] The detection device 100 can display and output the height H1 of the bag-shaped housing 31 and the height H2 of the folded portion 34 in a graph. Figure 5 and Figure 6 As shown, after completing the measurement of the height of the bag-shaped housing 31 and the height of the folding portion 34, the detection device 100 can display the height of the bag-shaped housing 31 measured in each interval in a first chart 501, and display the height of the folding portion 34 measured in each interval in a second chart 502. Figure 5As shown, when there is no interval where the height H2 of the folded portion 34 is higher than the height H1 of the bag-shaped housing 31, the detection device 100 can determine that the bag-shaped housing 31 is in a normal state (i.e., there is no folding defect). Figure 6 As shown, if there is at least a portion of the interval where the height H2 of the folded portion 34 is higher than the height H1 of the pouch-shaped housing 31, the detection device 100 can determine that a folding defect has occurred. Because the detection device 100 according to the present disclosure displays the measured height H1 of the pouch-shaped housing 31 and the height H2 of the folded portion 34 in a graph, a user (or administrator) can easily determine whether a folding defect has occurred and the interval where the folding defect has occurred.

[0051] On the other hand, although the secondary battery 30 shown and described above includes one folded portion 34 , the secondary battery 30 may also include two or more folded portions.

[0052] Figure 7 is a block diagram illustrating a configuration of an apparatus for detecting a folding defect of a secondary battery according to one embodiment of the present disclosure.

[0053] Reference Figure 7 According to an embodiment of the present disclosure, a device for detecting folding defects of secondary batteries (hereinafter referred to as a detection device) 700 may be the detection device 100 of Figure 1. However, the detection device 700 may operate in conjunction with the transfer device 200 as shown in Figure 1, or may operate independently.

[0054] According to one embodiment, the detection device 700 may include a memory 710 , a processor 720 , a laser scanner 730 , an alarm module 740 , a communication module 750 , and a display 760 .

[0055] The memory 710 may store a program for controlling the operation of the detection apparatus 700 and / or information required for controlling the operation of the detection apparatus 700 (eg, a reference value, a region of interest, the number of intervals, a graph, etc.).

[0056] The processor 720 can control the overall operation of the detection device 700. For example, the processor 720 can receive commands or instructions from the memory 710 and control the various components to perform various functions based on the received commands or instructions. The processor 720 can be a central processing unit (CPU), a microcontroller unit (MCU), a microprocessor unit (MPU), etc.

[0057] According to one embodiment, the processor 720 can control the configuration of the detection device 700 (for example, the laser scanner 730, the alarm module 740, the communication module 750) to confirm whether the secondary battery 200 has a folding defect and issue an alarm for the folding defect. Figure 8 Detailed description.

[0058] The laser scanner 730 can measure the height of the folding portion of the secondary battery and the height of the pouch case. For example, the laser scanner 730 can emit laser light at a specified scanning rate within a specified range and receive reflected laser light to measure the height of the folding portion and the height of the pouch case.

[0059] When specified conditions are met, the alarm module 740 can issue an alarm in a specified manner. For example, if a folding defect is detected, the alarm module 740 can issue an alarm. The alarm module 740 can issue at least one of a visual alarm (e.g., light-emitting diode (LED) lighting, icon display, pop-up window display, etc.), an audible alarm (e.g., sound effect output), and a tactile alarm (e.g., vibration). To this end, the alarm module 740 can include at least one of an LED, a display, a speaker, and a vibration motor.

[0060] The communication module 750 can communicate with an external device (e.g., the transfer device 200 of FIG. 1 , an administrator's portable terminal (e.g., a smartphone), etc.) through wired communication or wireless communication. For example, the communication module 750 can receive a folding defect detection request from the transfer device 200. In addition, after completing the folding defect detection, the communication module 750 can notify the transfer device 200 that the detection is complete. After receiving the notification of the completion of the detection, the transfer device 200 can move the secondary battery that has completed the detection to a location for the next process. In another example, the communication module 750 can send an alert that a folding defect has occurred to a designated external device (e.g., an administrator's smartphone). In yet another example, the communication module 750 can send a graph showing the height of the folding portion and the height of the bag-shaped shell to a designated external display device.

[0061] The display 760 may display various screens (eg, images). In some embodiments, the display 760 may include a touch panel for inputting information. For example, the display 760 may output the height of the folding portion and the height of the pouch housing in a graph.

[0062] On the other hand, detection device 700 may not include some of the above-mentioned configurations, or may further include other configurations. For example, detection device 700 may not include alarm module 740, communication module 750, and / or display 760. In another example, detection device 700 may further include an input module for receiving user input (e.g., operation commands). Alternatively, some of the configurations of detection device 700 may be configured as separate external devices. For example, the laser scanner 730 and / or display 760 of detection device 700 may be configured as separate external devices.

[0063] Figure 8 is a flowchart for explaining a method of detecting a folding defect of a secondary battery according to one embodiment of the present disclosure.

[0064] Reference Figure 8 According to one embodiment of the present disclosure, a method for detecting folding defects in secondary batteries may include step S801 of measuring the height of the folded portion and the height of the pouch-shaped casing of the secondary battery. For example, a detection device (e.g., processor 720) may utilize a laser scanner (e.g., laser scanner 730) to measure the height of the folded portion and the height of the pouch-shaped casing of the secondary battery being transported by a carrier (e.g., carrier 220) of a transport device. According to one embodiment, the detection device may measure the height of the folded portion and the height of the pouch-shaped casing as the carrier carrying the secondary battery passes beneath the laser scanner at a specified speed along a track of the transport device. Alternatively, a portion of the measurement range of the laser scanner may be designated as a region of interest. The detection device may measure the height of the pouch-shaped casing using a first region of interest within the designated region of interest and measure the height of the folded portion using a second region of interest within the designated region of interest. The detection device may begin measurement when the secondary battery is detected in the region of interest and terminate measurement when the secondary battery is not detected in the region of interest. The detection device may measure the height of the folded portion and the height of the pouch-shaped casing at each specified interval along the length of the secondary battery. The detection device may determine the maximum value among the heights of the folded portion measured in each interval as the height of the folded portion in the corresponding interval, and may determine the maximum value among the heights of the pouch-shaped housing measured in each interval as the height of the pouch-shaped housing in the corresponding interval. The detection device may display and output the determined heights of the folded portion and the determined heights of the pouch-shaped housing in a graph.

[0065] The method may include step S803 of confirming whether the height difference is greater than a specified reference value. For example, the detection device (eg, the processor 720) may confirm whether there is a section in the measurement section where the height of the folded portion is greater than the height of the pouch case by a specified reference value.

[0066] If, as a result of the confirmation in step S803, there is no interval where the height of the folded portion is greater than the height of the bag-like housing by more than the reference value, the method may proceed to step S805, which determines that the condition is normal. On the other hand, if, as a result of the confirmation in step S803, there is an interval where the height of the folded portion is greater than the height of the bag-like housing by more than the reference value, the method may proceed to step S807, which determines that a folding defect has occurred.

[0067] The method may include step S809 of issuing an alarm. For example, the detection device may control the alarm module 740 to issue an alarm indicating the occurrence of a folding defect in a specified manner (e.g., a visual alarm (e.g., light emitting diode (LED) lighting, icon display, pop-up window display, etc.), an auditory alarm (e.g., sound effect output), and / or a tactile alarm (e.g., vibration generation)).

[0068] On the other hand, although Figure 8 Although not shown in the figure, the method may further include the step of sending an alert of the occurrence of the folding defect to a designated external device (eg, a smart phone of an administrator) through a communication module (eg, the communication module 750).

[0069] The above description is merely an example of applying the principles of the present disclosure, and other configurations may be included without departing from the scope of the present disclosure. For example, at least some of the various embodiments of the present disclosure described above may be combined.

Claims

1. A method for detecting folding defects of a secondary battery, comprising the following steps: measuring the height of the folded portion and the height of the pouch case of the secondary battery being transferred by the transfer device at each designated interval using a laser scanner; confirming whether there is a section in which the height of the folded portion is greater than the height of the bag-shaped casing by a predetermined reference value or more; and When there is a section in which the height of the folded portion is greater than the height of the bag-shaped casing by the reference value or more, it is determined that the folding defect has occurred.

2. The method for detecting a folding defect of a secondary battery according to claim 1, wherein: The laser scanner is fixedly arranged above the track of the transfer device. In the measuring step, the carrier on which the secondary battery is mounted moves along the track at a specified speed and passes under the laser scanner.

3. The method for detecting a folding defect of a secondary battery according to claim 1, wherein: A portion of the area within the measurement range of the laser scanner is pre-set as a region of interest, The measuring step comprises the following steps: The height of the pouch case is measured through a first region of interest among the regions of interest, and the height of the folded portion is measured through a second region of interest among the regions of interest.

4. The method for detecting a folding defect of a secondary battery according to claim 3, wherein: The measuring step comprises the following steps: The measurement is started when the secondary battery is sensed in the region of interest, and is ended when the secondary battery is not sensed in the region of interest.

5. The method for detecting a folding defect of a secondary battery according to any one of claims 1 to 4, wherein: The measuring step comprises the following steps: The height of the folded portion and the height of the pouch case are measured at each designated section along the length direction of the secondary battery.

6. The method for detecting a folding defect of a secondary battery according to claim 5, wherein: The measuring step comprises the following steps: The maximum value among the heights of the folded portion measured in each section is determined as the height of the folded portion of the corresponding section, and the maximum value among the heights of the pouch-shaped case measured in each section is determined as the height of the pouch-shaped case of the corresponding section.

7. The method for detecting a folding defect of a secondary battery according to claim 6, further comprising the following steps: The determined height of the folded portion and the determined height of the pouch are displayed and outputted in a graph.

8. The method for detecting a folding defect of a secondary battery according to any one of claims 1 to 4, further comprising the following steps: When it is determined that the folding defect has occurred, an alarm is issued in a specified manner.

9. A device for detecting folding defects of a secondary battery, comprising: A laser scanner emits laser light at a specified scanning rate within a specified range and receives reflected laser light; as well as The processor controls the laser scanner to measure the height of the folded portion and the height of the bag-shaped shell of the secondary battery being transferred by the transfer device in each specified interval, and confirms whether there is an interval in which the height of the folded portion measured by the laser scanner is greater than the height of the bag-shaped shell by more than a specified reference value. When there is an interval in which the height of the folded portion is greater than the height of the bag-shaped shell by more than the reference value, it is determined that the folding defect has occurred.

10. The device for detecting folding defects of a secondary battery according to claim 9, wherein: The laser scanner is fixedly arranged above the track of the transfer device. The processor measures a height of the folded portion and a height of the pouch case when the carrier on which the secondary battery is mounted moves along the track at a specified speed and passes under the laser scanner.

11. The device for detecting a folding defect of a secondary battery according to claim 9, wherein: A portion of the area within the measurement range of the laser scanner is pre-set as a region of interest, The processor measures a height of the pouch case through a first region of interest among the regions of interest, and measures a height of the folded portion through a second region of interest among the regions of interest.

12. The device for detecting a folding defect of a secondary battery according to claim 11, wherein: The processor starts the measurement when the secondary battery is sensed in the area of interest, and ends the measurement when the secondary battery is not sensed in the area of interest.

13. The device for detecting a folding defect of a secondary battery according to any one of claims 9 to 12, wherein: The processor measures a height of the folded portion and a height of the pouch case at each designated section along a length direction of the secondary battery.

14. The device for detecting a folding defect of a secondary battery according to claim 13, wherein: The processor determines a maximum value among the heights of the folded portion measured in each section as the height of the folded portion of the corresponding section, and determines a maximum value among the heights of the pouch-shaped housing measured in each section as the height of the pouch-shaped housing of the corresponding section.

15. The apparatus for detecting a folding defect of a secondary battery according to claim 14, further comprising: The display outputs the determined height of the folded portion and the determined height of the bag-shaped housing in a graphical form.

16. The device for detecting a folding defect of a secondary battery according to any one of claims 9 to 12, further comprising: The alarm module issues an alarm in a specified manner when the folding defect occurs.

17. A system for detecting folding defects of a secondary battery, comprising: a transfer device for transferring the secondary battery; a laser scanner fixedly mounted on one side of the transfer device, configured to measure the height of the folded portion of the secondary battery and the height of the pouch-shaped casing at each designated interval when the secondary battery is transferred by the transfer device; and A detection device detects whether the folding defect occurs based on the height of the folded portion and the height of the bag-shaped casing measured by the laser scanner.

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