Battery inspection device, battery inspection method, and battery manufacturing system

Abstract

According to some embodiments, a battery inspection device comprises: a photographing unit configured to generate a negative electrode insertion state image by photographing an insertion state of a negative electrode inserted toward a winding core to form a jelly roll of a cylindrical battery cell; and a processing unit configured to measure a first distance indicating the insertion state of the negative electrode on the basis of the negative electrode insertion state image, calculate a negative electrode insertion amount indicator indicating the insertion amount of the negative electrode on the basis of the first distance, and diagnose a winding state of the jelly roll on the basis of the negative electrode insertion amount indicator.

Description

Battery inspection device, battery inspection method, and battery manufacturing system

[0001] Cross-citation with related applications

[0002] The present application claims the benefit of priority based on Korean Patent Application No. 10-2024-0184389 filed on December 12, 2024, and includes all contents disclosed in the document of said patent application as part of this specification.

[0003] Technology field

[0004] The embodiments disclosed in this document relate to a battery inspection device, a battery inspection method, and a battery manufacturing system.

[0005] Recently, active research and development on secondary batteries has been underway. Here, secondary batteries are rechargeable batteries and can be interpreted to encompass conventional Ni / Cd and Ni / MH batteries, as well as the more recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries can possess higher energy density compared to conventional Ni / Cd and Ni / MH batteries, and because they can be manufactured in a compact and lightweight form factor, they offer high utility as power sources for mobile devices. Recently, their scope of application has expanded to include power sources for electric vehicles, drawing attention as a next-generation energy storage medium.

[0006] A jelly roll of a cylindrical battery cell can be manufactured by winding the battery electrodes and separator together. The quality of the jelly roll may vary depending on the condition in which the electrodes and separator are fed into the winding device. For example, the internal structure of the completed jelly roll may differ due to the relative positional difference when the negative electrode, positive electrode, and separator are fed into the winding core. Since internal structural defects, such as separator damage, may occur if manufacturing parameters indicating the relative positional difference deviate from the normal range, it may be necessary to continuously monitor the relative positional difference of the negative electrode, positive electrode, and separator when they are fed into the winding core.

[0007] One of the objectives of the embodiments disclosed in this document is to provide a battery inspection device, a battery inspection method, and a battery manufacturing system capable of monitoring the relative positional difference when a cathode, an anode, and a separator are inserted into a winding core in a non-destructive manner through a photographic means.

[0008] The technical objectives of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below.

[0009] According to some embodiments, the battery inspection device comprises: a shooting unit configured to capture the insertion state of a negative electrode being inserted toward a winding core to form a jelly roll of a cylindrical battery cell and to generate a negative electrode insertion state image; and a processing unit configured to measure a first distance indicating the insertion state of the negative electrode based on the negative electrode insertion state image, calculate a negative electrode insertion amount index indicating the amount of the negative electrode inserted based on the first distance, and diagnose the winding state of the jelly roll based on the negative electrode insertion amount index.

[0010] According to some embodiments, the processing unit is configured to calculate the first distance by applying a conversion factor to the pixel distance between a first pixel representing the foremost end of the cathode and a second pixel representing the winding core in the cathode input state image.

[0011] According to some embodiments, the processing unit is configured to calculate the cathode input amount index by adding a second distance from a separator cutting unit, which is configured to cut a first separator introduced between the anode and the cathode toward the winding core to form the jelly roll, to the first distance.

[0012] According to some embodiments, the processing unit is configured to determine a first state regarding whether the cathode length in the jelly roll has a safety margin relative to the anode length based on the cathode input amount indicator, and to diagnose the winding state of the jelly roll based on the first state.

[0013] According to some embodiments, the processing unit is configured to determine a second state regarding whether a triple overlapping region of the separator is secured in the jelly roll based on the cathode input amount indicator, and to diagnose the winding state of the jelly roll based on the second state.

[0014] According to some embodiments, the imaging unit is configured to photograph the insertion state from a direction facing the cathode before the cathode, the first separator, the anode, and the second separator are inserted into the winding core.

[0015] According to some embodiments, the shooting unit is configured to photograph the input state based on a shooting trigger signal generated whenever the motor rotating the winding core rotates by a preset angle.

[0016] According to some embodiments, a battery inspection method comprises: a step of generating a negative electrode input state image by photographing the input state of a negative electrode being fed toward a winding core to form a jelly roll of a cylindrical battery cell through a photographing unit; a step of measuring a first distance indicating the input state of the negative electrode based on the negative electrode input state image through a processing unit; a step of calculating a negative electrode input amount index indicating the input amount of the negative electrode based on the first distance through the processing unit; and a step of diagnosing the winding state of the jelly roll based on the negative electrode input amount index through the processing unit.

[0017] According to some embodiments, the step of measuring the first distance includes the step of calculating the first distance by applying a conversion factor to the pixel distance between a first pixel representing the foremost end of the cathode and a second pixel representing the winding core in the cathode input state image.

[0018] According to some embodiments, the step of calculating the cathode input amount indicator includes the step of calculating the cathode input amount indicator by adding a second distance from a separator cutting unit configured to cut a first separator introduced between the anode and the cathode toward the winding core to the first distance, thereby calculating the cathode input amount indicator.

[0019] According to some embodiments, the step of diagnosing the winding state of the jelly roll comprises: a step of determining a first state regarding whether the cathode length in the jelly roll has a safety margin relative to the anode length based on the cathode input amount indicator; and a step of diagnosing the winding state of the jelly roll based on the first state.

[0020] According to some embodiments, the step of diagnosing the winding state of the jelly roll comprises: a step of determining a second state regarding whether a triple overlapping region of the separator is secured in the jelly roll based on the cathode input amount indicator; and a step of diagnosing the winding state of the jelly roll based on the second state.

[0021] According to some embodiments, the step of generating the cathode input state image includes the step of photographing the input state from a direction facing the cathode before the cathode, the first separator, the anode, and the second separator are input into the winding core.

[0022] According to some embodiments, the step of photographing the input state includes photographing the input state based on a photographing trigger signal generated whenever the motor rotating the winding core rotates by a preset angle.

[0023] According to some embodiments, a battery manufacturing system comprises: an input device configured to input a negative electrode toward a winding center to form a jelly roll of a cylindrical battery cell; a battery inspection device configured to capture the input state of the negative electrode to generate a negative electrode input state image, measure a first distance indicating the input state of the negative electrode based on the negative electrode input state image, calculate a negative electrode input amount index indicating the amount of the negative electrode input based on the first distance, and diagnose the winding state of the jelly roll based on the negative electrode input amount index; and a winding device configured to form the jelly roll.

[0024] According to the embodiments disclosed in this document, a battery inspection device, a battery inspection method, and a battery manufacturing system can be provided, which can monitor the relative positional difference when a cathode, an anode, and a separator are inserted into a winding core in a non-destructive manner through a photographic means.

[0025] The technical effects according to the embodiments disclosed in this document are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art in accordance with the disclosure of this document.

[0026] FIG. 1 illustrates a method of operation of a battery manufacturing system according to some embodiments.

[0027] FIG. 2 illustrates elements constituting a battery inspection device according to some embodiments.

[0028] FIG. 3 illustrates a method of forming a jelly roll through a winding device according to some embodiments.

[0029] FIGS. 4 and 5 illustrate a structure in which a photographing means according to some embodiments photographs the insertion state of a cathode.

[0030] FIG. 6 illustrates a method for calculating a cathode input amount indicator according to some embodiments.

[0031] FIG. 7 illustrates a cathode input state image generated by capturing the cathode input state according to some embodiments.

[0032] FIG. 8 illustrates the results of a comparison between the estimated and measured values ​​of the cathode input amount indicator according to some embodiments.

[0033] FIG. 9 illustrates steps constituting a battery inspection method according to some embodiments.

[0034] Hereinafter, embodiments described in this document are described with reference to the accompanying drawings. However, this is not intended to limit the disclosure of this document to specific embodiments and should be understood to include various modifications, equivalents, and / or alternatives to the embodiments described in this document.

[0035] The embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments and should be understood to include various modifications, equivalents, or substitutions of said embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of said items unless the relevant context clearly indicates otherwise.

[0036] In this document, each of the phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “at least one of A, B, or C” may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as “first,” “second,” “first,” “second,” “A,” “B,” “(a),” or “(b)” may be used simply to distinguish a component from another component and, unless specifically stated otherwise, do not limit the components in any other aspect (e.g., importance or order).

[0037] In this document, where it is stated that any (e.g., 1) component is "connected," "coupled," or "joined" to another (e.g., 2) component, with or without the terms "functionally" or "communicationly," or where it is stated that the component is "coupled" or "connected," it means that the component may be connected to the other component directly (e.g., by wire or wirelessly) or indirectly (e.g., through a 3) component.

[0038] Methods according to the various embodiments disclosed in this document may be provided as part of a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory, CD-ROM) or distributed online (e.g., download or upload) through an application store or directly between two driver devices. In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0039] According to the embodiments disclosed in this document, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to the embodiments disclosed in this document, one or more of the components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the components of the multiple components in the same or similar manner as those performed by the corresponding components among the multiple components prior to the integration. According to the embodiments disclosed in this document, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0040] FIG. 1 illustrates a method of operation of a battery manufacturing system according to some embodiments.

[0041] Referring to FIG. 1, a battery manufacturing system (100) can form a jelly roll (50) by winding a negative electrode (10), a first separator (20), a positive electrode (30), and a second separator (40), and can inspect the internal structure of the jelly roll (50) during this process. To this end, the battery manufacturing system (100) may include an input device (110), a battery inspection device (120), and a winding device (130).

[0042] The input device (110) can input the negative electrode (10), the first separator (20), the positive electrode (30), and the second separator (40) into the winding core through roller rotation, etc. The negative electrode (10) and the positive electrode (30) can be input into the winding device (130) in the form of electrode rolls and can be cut into the amount required to form a jelly roll (50). The first separator (20) and the second separator (40) can also be input into the winding core through the input device (110) and can be cut into the amount required to form a jelly roll (50). The battery manufacturing system (100) may further include an electrode cutting unit and a separator cutting unit.

[0043] The battery inspection device (120) can predict the winding state of the jelly roll (50) in advance at a point before the negative electrode (10), the first separator (20), the positive electrode (30), and the second separator (40) are introduced into the winding core and are wound by the winding device (130). The winding state of the jelly roll (50) can be diagnosed based on the state in which the negative electrode (10), the first separator (20), the positive electrode (30), and the second separator (40) are introduced into the winding core or the arrangement state of the materials introduced. Based on the order of introduction of the materials, positional relationship, relative introduction position, etc., it can be determined whether the internal structure of the jelly roll (50) is properly formed. For example, the amount of the first separator (20) introduced into the winding core first relative to the negative electrode (10) falls within a specific range, and the internal structure of the jelly roll (50) can be normal only if the negative electrode (10) is introduced into the winding core before the positive electrode (30). The battery inspection device (120) may include an image generating means, such as a camera, to analyze the order of input of input materials, positional relationships, relative input positions, etc.

[0044] FIG. 2 illustrates elements constituting a battery inspection device according to some embodiments.

[0045] Referring to FIG. 2, the battery inspection device (120) may include a shooting unit (121) and a processing unit (122). However, it is not limited thereto, and some components may be omitted from the battery inspection device (120), or other general-purpose components may be further included in the battery inspection device (120).

[0046] The shooting unit (121) may include shooting means such as a camera or an image sensor, and the processing unit (122) may include memory and a processor. The processor can process the functions of the battery inspection device (120) by executing instructions stored in the memory. For example, the memory may be implemented in the form of a non-volatile device such as ROM, a volatile device such as RAM, an HDD, an SSD, an SD, a Micro-SD, or a combination thereof. The processor may be implemented in the form of at least one of a microprocessor, a CPU, a GPU, and an AP.

[0047] The imaging unit (121) may be configured to generate an image of the negative electrode input state by capturing the input state of the negative electrode being fed toward the winding core to form a jelly roll of a cylindrical battery cell. The imaging of the input state may be performed before the negative electrode is fed into the winding core. The input state of the input materials may determine the internal structure of the jelly roll.

[0048] The processing unit (122) may be configured to measure a first distance indicating the cathode input state based on a cathode input state image. The first distance may be measured based on pixels of the cathode input state image. The first distance may indicate the difference between the input amount of the first separator and the input amount of the cathode. The first distance may be determined based on the difference between the position of the winding core and the position of the cathode front end at the moment when the first separator and the second separator corresponding to each jelly roll are cut.

[0049] The processing unit (122) may be configured to calculate a cathode input amount indicator representing the amount of cathode input based on a first distance. The cathode input amount indicator may be referenced to indicate the difference between the amount of first separator input and the amount of cathode input. The cathode input amount indicator may be calculated based on a value determined by the first distance and the equipment specifications of the battery manufacturing system (100).

[0050] The processing unit (122) may be configured to diagnose the winding state of the jelly roll based on the negative electrode input amount indicator. Based on the results of repeating the manufacture of the jelly roll through the battery manufacturing system (100), if the negative electrode input amount indicator deviates from a specific range, it may be confirmed that the internal structure of the jelly roll is inadequate. Taking this into consideration, the winding state of the jelly roll may be predicted in a non-destructive manner based on whether the negative electrode input amount indicator falls within a normal range. Once the winding state of the jelly roll is predicted, the process state of the battery manufacturing system (100) may be changed based on this, or notifications and / or warnings may be provided to the user. For example, if the process state is diagnosed as defective, the processing unit (122) may generate a process stop signal for the battery manufacturing system (100) so that the arrangement state of the winding materials can be adjusted, and a warning / notification regarding the defective arrangement state may be provided to the process manager.

[0051] According to an embodiment, the processing unit (122) may be configured to calculate a first distance by applying a conversion factor to the pixel distance between a first pixel representing the leading edge of the cathode and a second pixel representing the winding core in a cathode input state image. The pixel distance between the first pixel and the second pixel may be converted into an actual distance between the leading edge of the cathode and the winding core through the conversion factor.

[0052] According to an embodiment, the processing unit (122) may be configured to calculate a negative electrode input amount index by adding a second distance from a separator cutting unit, which is configured to cut a first separator introduced between the positive and negative electrodes toward the winding core to form a jelly roll, to the first distance. The second distance may be a value related to the equipment specifications of the battery manufacturing system (100), and among them, the distance between the separator cutting unit and the winding core may be utilized. The second distance may be a fixed value regardless of the progress status of the input process and / or the winding process. The sum of the first distance and the second distance may produce a difference between the input position of the first separator and the input position of the negative electrode, or a difference in input amount.

[0053] According to an embodiment, the processing unit (122) may be configured to determine a first state regarding whether the cathode length in the jelly roll has a safety margin relative to the anode length based on a cathode input amount indicator, and to diagnose the winding state of the jelly roll based on the first state. In a jelly roll that has been wound, if the length of the input cathode is not greater than the length of the input anode, problems may arise in the performance or stability of the cylindrical cell. To prevent this, the cathode length must have a safety margin relative to the anode length, and the value of the safety margin may be determined based on the cathode input amount indicator. The relationship between the safety margin and the anode input amount indicator may be established based on statistical data regarding the results of jelly roll manufacturing through the battery manufacturing system (100). Based on the cathode input amount indicator, it may be determined whether the value of the safety margin falls within a normal range.

[0054] According to an embodiment, the processing unit (122) may be configured to determine a second state regarding whether a triple-overlapping separator region is secured in the jelly roll based on a cathode input amount indicator, and to diagnose the winding state of the jelly roll based on the second state. The triple-overlapping separator region may be formed at the foremost portion of the anode in the jelly roll by the operation of the winding device (130). For example, if the anode is formed of a metal material such as aluminum, the anode end portion may be formed sharply due to cutting, and the separator may be damaged as a result. To prevent this, the winding of the materials may be designed so that a triple-overlapping separator region is formed at the foremost portion of the anode. The formation of the triple-overlapping separator region may be determined based on the cathode input amount indicator. The relationship between the two may be established based on statistical data regarding the manufacture of a cylindrical cell. Based on the cathode input amount indicator, it may be determined whether a triple-overlapping separator region is formed in a normal area.

[0055] According to an embodiment, the imaging unit (121) may be configured to photograph the insertion state from a direction facing the cathode before the cathode, the first separator, the anode, and the second separator are inserted into the winding core. When photographed from a direction facing the cathode, the anode and the second separator may be obscured by the first separator, but the position of the cathode on the first separator may be indicated. The positional relationship or arrangement state of the cathode and the first separator may be utilized to estimate the winding state of the jelly roll, and to verify this, the imaging unit (121) may photograph the insertion state from a position where the cathode is visible.

[0056] According to an embodiment, the shooting unit (121) may be configured to capture the input state based on a shooting trigger signal generated whenever the motor rotating the winding core rotates by a preset angle. The timing of the shooting may be important for accurately verifying the positional relationship or arrangement state of the cathode and the first separator. The rotation angle of the winding core may be referenced to accurately set the timing of the shooting. Images may be generated at intervals of a preset angle, and the image at the most suitable time among them may be used to analyze the positional relationship or arrangement state of the cathode and the first separator. For example, the preset angle may be 60 degrees, 90 degrees, 120 degrees, etc.

[0057] FIG. 3 illustrates a method of forming a jelly roll through a winding device according to some embodiments.

[0058] Referring to FIG. 3, a method of forming a jelly roll through a winding device in a battery manufacturing system (100) can be illustrated.

[0059] When the first separator (20) and the second separator (40) are cut by the separator cutter, the first separator (20) and the second separator (40) can be moved from a first position (310) close to the separator cutter to a second position (320) close to the opposite cathode (10) and anode (30). In the area of ​​the second position (320), winding can proceed by the rotation of the winding core with a portion of the first separator (20) and the second separator (40) overlapping.

[0060] In the state described above, prior to the cathode (10) and anode (30) being inserted into the core, various indicators can be utilized to estimate the internal structure of the jelly roll after the completion of winding. For example, indicators utilized to estimate the winding state may include the amount of separator inserted, folding line distance, core distance, core circumference, mismatch section, triple overlap section, etc.

[0061] The folding line distance may be the distance from the position of the separator cutter to the folding line of the input materials, and the winding core distance may be the distance from the position of the separator cutter to the winding core. The separator input amount may be the distance obtained by adding the first distance to the folding line distance or the winding core distance. The first distance may be the distance between the winding core and the cathode front end. These distances may be measured before the rotation of the winding core begins, or at a point when the rotation of the winding core has been performed for a certain amount.

[0062] The circumference of the winding core may be the circumference where the first separator (20) and the second separator (40) are wound along the winding core, and may be used as an auxiliary tool for estimating the winding state. The mismatch section and the triple overlap section may be determined by the arrangement relationship of the negative electrode (10) and the positive electrode (30). The amount of separator input may be related to the formation of the triple overlap section. Only when the amount of separator input falls within an appropriate range can the triple overlap section be properly formed at the end portion of the positive electrode (30). If the triple overlap section is not formed, the performance or stability of the cylindrical cell may be degraded due to damage such as tearing of the separator. Therefore, to determine whether the amount of separator input falls within an appropriate range, the battery inspection device (120) may measure a first distance between the winding core and the front end of the negative electrode. Meanwhile, regarding the mismatch section, the negative electrode (10) may need to be introduced before the positive electrode (30), and a safety margin regarding the difference in introduction amount may need to be secured.

[0063] FIGS. 4 and 5 illustrate a structure in which a photographing means according to some embodiments photographs the insertion state of a cathode.

[0064] Referring to FIG. 4, the imaging means (121) can be installed at a position where it can photograph the cathode (10) being inserted toward the winding core (500) to photograph the insertion state of the cathode (10). Referring to FIG. 5, the imaging means (121) can photograph the insertion materials from a direction facing the cathode (10), and can photograph the insertion state at a point before the cathode (10) enters the winding core (500).

[0065] FIG. 6 illustrates a method for calculating a cathode input amount indicator according to some embodiments.

[0066] Referring to FIG. 6, the cathode input amount index can be calculated based on a first distance (D1) and a second distance (D2). The first distance (D1) can be calculated based on a cathode input state image generated by a shooting unit (121). The cathode input amount index can be calculated by adding the second distance (D2) to the first distance (D1). The second distance (D2) is the distance between the separator cutter (600) and the winding core, and may be a fixed value.

[0067] FIG. 7 illustrates a cathode input state image generated by capturing the cathode input state according to some embodiments.

[0068] Referring to FIG. 7, a cathode input state image (700) generated by capturing the input state of the cathode (10) can be shown.

[0069] In the cathode input state image (700), the position of the foremost portion of the cathode (10) can be displayed on the first separator (20). Based on the cathode input state image (700), the positional relationship and arrangement state of the materials being input for winding can be confirmed. The positional relationship and arrangement state can determine the internal structure and winding state of the jelly roll. Meanwhile, in the cathode input state image (700), the electrode tab of the anode (30) can be displayed on the side of the first separator (20). Based on this, the input state of the anode (30) can be confirmed, and the positional relationship between the cathode (10) and the anode (30) can be confirmed.

[0070] FIG. 8 illustrates the results of a comparison between the estimated and measured values ​​of the cathode input amount indicator according to some embodiments.

[0071] Referring to FIG. 8, a graph (800) illustrating the results of a comparison between the estimated and measured values ​​of the cathode input amount index may be shown. In the graph (800), the horizontal axis may represent the estimated value of the cathode input amount index, and the vertical axis may represent the measured value of the cathode input amount index.

[0072] In graph (800), part of the data may fall within the 95% confidence interval (CI), and all of the data may fall within the 95% prediction interval (PI). R for the estimated and actual values 2 The value may be approximately 0.95, and according to this, calculating the negative electrode input amount index by summing the first distance (D1) and the second distance (D2) using a battery inspection device (120) can have high reliability.

[0073] FIG. 9 illustrates steps constituting a battery inspection method according to some embodiments.

[0074] Referring to FIG. 9, the battery inspection method (900) may include steps (910) through (940). However, it is not limited thereto, some steps may be omitted or other general steps may be added, and the steps of the battery inspection method (900) may be executed in a different order than the illustrated order.

[0075] The battery inspection method (900) may consist of steps processed sequentially in the battery inspection device (120). Therefore, even if the details are omitted below, the description of the battery inspection device (120) above may be equally applicable to the battery inspection method (900).

[0076] Steps (910) to (940) of the battery inspection method (900) can be performed by the shooting unit (121) and processing unit (122) of the battery inspection device (120).

[0077] In step (910), the battery inspection device (120) may perform the step of generating a negative electrode insertion state image by photographing the insertion state of the negative electrode being inserted toward the winding core to form a jelly roll of the cylindrical battery cell through a shooting unit.

[0078] In step (920), the battery inspection device (120) may perform the step of measuring a first distance indicating the input state of the negative electrode based on an image of the negative electrode input state through a processing unit.

[0079] In step (930), the battery inspection device (120) may perform the step of calculating a negative electrode input amount indicator that indicates the amount of negative electrode input based on a first distance through a processing unit.

[0080] In step (940), the battery inspection device (120) can perform a step of diagnosing the winding state of the jelly roll based on the negative electrode input amount indicator through the processing unit.

[0081] According to an embodiment, the battery inspection method (900) may be implemented in the form of a computer program stored on a computer-readable storage medium. That is, the computer program may include instructions for implementing the battery inspection method (900), and the instructions of the program may be stored on a computer-readable storage medium. The computer program may include a mobile application.

[0082] According to an embodiment, a computer-readable storage medium may include magnetic media such as a hard disk, a floppy disk, and a magnetic tape, optical media such as a CD-ROM and a DVD, magneto-optical media such as a floptical disk, and a hardware device specifically configured to store and execute computer program instructions such as ROM, RAM, and flash memory. Computer program instructions may include machine code generated by a compiler and high-level language code that can be executed by a computer using an interpreter, etc.

[0083] Terms such as "include," "compose," or "have" as used above, unless specifically stated otherwise, mean that the relevant component may be inherent; therefore, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments disclosed in this document pertain, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and, unless explicitly defined in this document, should not be interpreted in an ideal or overly formal sense.

[0084] The foregoing description is merely an illustrative explanation of the technical concept disclosed in this document, and a person skilled in the art to which the embodiments disclosed in this document pertain can make various modifications and variations within the scope of the essential characteristics of the embodiments disclosed in this document. Accordingly, the embodiments disclosed in this document are intended to explain, not limit, the technical concept of the embodiments disclosed in this document, and the scope of the technical concept disclosed in this document is not limited by these embodiments. The scope of protection of the technical concept disclosed in this document shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of this document.

Claims

1. A shooting unit configured to generate a negative electrode insertion state image by capturing the insertion state of a negative electrode being inserted toward a winding core to form a jelly roll of a cylindrical battery cell; and Based on the above image of the cathode input state, a first distance indicating the input state of the cathode is measured, and Calculate a cathode input amount index indicating the amount of cathode input based on the first distance above, and A battery inspection device comprising a processing unit configured to diagnose the winding state of the jelly roll based on the above-mentioned cathode input amount indicator.

2. In Paragraph 1, A battery inspection device configured such that the processing unit calculates the first distance by applying a conversion coefficient to the pixel distance between the first pixel representing the foremost end of the cathode and the second pixel representing the winding core in the cathode input state image.

3. In Paragraph 2, A battery inspection device configured such that the processing unit calculates the negative electrode input amount index by adding the second distance from the separator cutting unit, which is configured to cut the first separator introduced between the positive electrode and the negative electrode toward the winding core to form the jelly roll, to the first distance.

4. In Paragraph 1, The processing unit determines a first state regarding whether the cathode length in the jelly roll has a safety margin relative to the anode length based on the cathode input amount indicator, and A battery inspection device configured to diagnose the winding state of the jelly roll based on the first state above.

5. In Paragraph 1, The processing unit determines a second state regarding whether a triple overlapping region of the separator is secured in the jelly roll based on the cathode input amount indicator, and A battery inspection device configured to diagnose the winding state of the jelly roll based on the second state above.

6. In Paragraph 1, A battery inspection device, wherein the above-described imaging unit is configured to photograph the insertion state from a direction facing the cathode before the cathode, the first separator, the anode, and the second separator are inserted into the winding core.

7. In Paragraph 6, A battery inspection device, wherein the above-described shooting unit is configured to photograph the insertion state based on a shooting trigger signal generated whenever the motor rotating the winding core rotates by a preset angle.

8. A step of generating a negative electrode insertion state image by photographing the insertion state of the negative electrode being inserted toward the winding core to form a jelly roll of a cylindrical battery cell through a shooting unit; A step of measuring a first distance indicating the cathode input state based on the cathode input state image through a processing unit; A step of calculating a cathode input amount index indicating the amount of cathode input based on the first distance through the processing unit; and A battery inspection method comprising the step of diagnosing the winding state of the jelly roll based on the cathode input amount indicator through the processing unit.

9. In Paragraph 8, The step of measuring the first distance above is, A battery inspection method comprising the step of calculating the first distance by applying a conversion factor to the pixel distance between the first pixel representing the foremost end of the cathode and the second pixel representing the winding core in the cathode input state image.

10. In Paragraph 9, The step of calculating the above cathode input amount indicator is, A battery inspection method comprising the step of calculating the negative electrode input amount index by adding the second distance from the separator cutting unit, configured to cut the first separator introduced between the positive electrode and the negative electrode toward the winding core to form the jelly roll, to the first distance.

11. In Paragraph 8, The step of diagnosing the winding state of the above jelly roll is, A step of determining a first state regarding whether the cathode length in the jelly roll has a safety margin relative to the anode length based on the above cathode input amount indicator; and A battery inspection method comprising the step of diagnosing the winding state of the jelly roll based on the first state.

12. In Paragraph 8, The step of diagnosing the winding state of the above jelly roll is, A step of determining a second state regarding whether a triple overlapping region of the separator is secured in the jelly roll based on the above cathode input amount indicator; and A battery inspection method comprising the step of diagnosing the winding state of the jelly roll based on the second state above.

13. In Paragraph 8, The step of generating the above cathode input state image is, A battery inspection method comprising the step of photographing the insertion state from a direction facing the cathode before the cathode, the first separator, the anode, and the second separator are inserted into the winding core.

14. In Paragraph 13, The step of photographing the above-mentioned input state is, A battery inspection method comprising the step of photographing the insertion state based on a shooting trigger signal generated whenever the motor rotating the above-mentioned coil rotates by a preset angle.

15. An input device configured to input a negative electrode toward a winding core to form a jelly roll of a cylindrical battery cell; A battery inspection device for capturing the input state of the cathode to generate a cathode input state image, measuring a first distance indicating the input state of the cathode based on the cathode input state image, calculating a cathode input amount index indicating the amount of cathode input based on the first distance, and diagnosing the winding state of the jelly roll based on the cathode input amount index; and A battery manufacturing system comprising a winding device configured to form the above jelly roll.

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