Secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring

Abstract

The present invention relates to a centering device provided in an insert pile and an insert pile provided with said centering device. More specifically, the invention relates to an insert pile that is inserted and installed inside a monopile to reduce the load-bearing capacity of the monopile after excavating the interior of the inserted monopile, wherein the centering device for controlling the verticality and centering of the insert pile during installation comprises a plurality of centering units arranged radially on the upper inner surface of the insert pile and protruding outwardly after the insert pile is inserted into the monopile and settled at a set position to press the inner surface of the monopile and center the insert pile.

Description

Technology Field

[0001] The present invention relates to a secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring. Background Technology

[0002] Recently, active research and development on rechargeable batteries has been underway. Rechargeable batteries are rechargeable batteries that encompass conventional Ni / Cd and Ni / MH batteries, as well as the more recent lithium-ion batteries. Among these, lithium-ion batteries have the advantage of significantly higher energy density compared to conventional Ni / Cd and Ni / MH batteries. Lithium-ion batteries can be manufactured in a compact and lightweight manner, making them widely used as power sources for mobile devices. Recently, their scope of application has expanded to include electric vehicles, drawing attention as a next-generation energy storage medium.

[0003] Battery cells, which are the basic units constituting battery packs and / or modules, consist of a positive electrode, a negative electrode, and a separator. Each battery cell is manufactured through processes such as electrode assembly, degassing, activation, charging and discharging, and aging. However, the performance or quality of a battery cell can vary depending on process variables, including the pressure applied to the cell by pressurizing equipment, the internal temperature of the chamber, charging and discharging conditions, and storage periods. Conventionally, the setting of these process variables relied heavily on the experience of engineers; consequently, it was difficult to predict in advance the impact on the performance or quality of battery cell products when manufacturing equipment was replaced or when equipment settings or conditions were changed.

[0004] The above electrode assembly can be roughly classified into a jelly-roll type, which is wound with a separator interposed between a sheet-type positive electrode and a negative electrode coated with an active material; a stack type, which is sequentially stacked with a plurality of positive and negative electrodes interposed with a separator; and a stack-and-fold type, which is wound with unit cells of the stack type into a long separator film.

[0005] The above electrode assembly is mostly manufactured by supplying individual electrodes from a magazine in which multiple individual electrodes are stacked. In this process, there has been a problem in which defects occur in the manufactured electrode assembly because the electrode to be supplied among the multiple individual electrodes stacked in the magazine is not properly separated.

[0006] Therefore, there is a need for a technology to properly separate the electrode for supply among the multiple electrodes stacked within the magazine. Prior art literature

[0007] Japanese Registered Patent JP 6264780 B Republic of Korea Published Patent KR 2024-0065543 A Republic of Korea Registered Patent KR 2219019 B1 The problem to be solved

[0008] Accordingly, the present invention has been devised to solve the aforementioned conventional problems. According to an embodiment of the present invention, the purpose is to provide a secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring, wherein the thickness of each sheet is measured during the stacking process, and the appropriate electrolyte injection amount is calculated by matching the measured thickness and thickness combinations with appropriate electrolyte injection amount data.

[0009] According to an embodiment of the present invention, the purpose is to provide a secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring, which can accurately determine the number of extracted cells by detecting a high-frequency magnetic field and a change in the amount of induced current, operate to detach from other unit cells by applying vibration or heat when two or more cells are adsorbed, and after separation, re-detect with a sensor unit to confirm whether only one cell remains and then feed it into a subsequent process.

[0010] In addition, according to an embodiment of the present invention, the purpose is to provide a secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring, which can measure the position alignment of the electrode sheet and separator using an upper vision sensor, and identify the degree of misalignment and whether a short circuit has occurred between current collectors by identifying side data of the stacked assembly through a side image acquisition unit (X-ray, etc.).

[0011] Meanwhile, the technical problems to be solved by the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0012] The first objective of the present invention can be achieved as a secondary battery assembly system capable of optimal electrolyte injection and monitoring, comprising: a thickness measuring unit for measuring the thickness of each electrode sheet and separator stacked on the stack table; an injection amount calculating unit for calculating the amount of electrolyte injected into the stack table based on the number of electrode sheets and separator stacked, the measured thickness value of the electrode sheet, and the thickness value of the separator; and an electrolyte injection means for injecting the calculated amount into the stack table.

[0013] The system includes an optimal electrolyte learning DB that collects the number of electrode sheets and the number of separators, combination data of the number of electrode sheets and separators, the thickness value of the electrode sheet and the thickness value of the separator, and combination data of the electrode sheet thickness value and the separator thickness value, and learns and classifies the optimal electrolyte injection amount according to the combination data of the number and the combination data of the thickness value; and the injection amount calculation unit may be characterized by inputting the measured combination data of the number and the combination data of the thickness value into the learning DB to calculate the optimal electrolyte injection amount.

[0014] In addition, it may be characterized by including a pickup means for picking up an electrode sheet from an electrode magazine section in which the electrode sheets are stacked, moving it to the stack table, and stacking it.

[0015] And the above pickup means may further include a sensor unit that determines the number of extracted electrode sheets by detecting a change in the high-frequency magnetic field and induced current amount after gripping the electrode sheet.

[0016] In addition, when the number of electrode sheets is two or more by the sensor unit, it may be characterized by including at least one of a vibration module that applies vibration to the grasped electrode sheet; and a heating module that heats the grasped electrode sheet to expand the air layer so that only the uppermost electrode sheet is grasped.

[0017] It may be characterized by including: a vision sensor that captures the electrode sheet and the separator that are stacked; and a judgment unit that determines the position and position alignment of the electrode sheet and the separator based on image data measured by the vision sensor.

[0018] Additionally, it may include a database storing alignment planar data and alignment side data; and a side image acquisition unit for measuring the side of an electrode assembly stacked on the stack table; wherein the determination unit determines position alignment by comparing image data measured by the vision sensor with the alignment planar data, and determines whether alignment stacking is achieved by comparing the side data and side cross-sectional data measured by the side image acquisition unit with the alignment side data.

[0019] The second objective of the present invention can be achieved as a secondary battery assembly method capable of optimal electrolyte injection and monitoring, wherein the method comprises: a step in which a pickup means picks up an electrode sheet from an electrode magazine unit in which electrode sheets are stacked and moves it to the stack table for stacking; a step in which a thickness measuring unit measures the thickness of each electrode sheet and separator stacked on the stack table; a step in which an injection amount calculation unit calculates the amount of electrolyte to be injected into the stack table based on the number of electrode sheets and separators stacked, the measured thickness value of the electrode sheet, and the thickness value of the separator; and a step in which an electrolyte injection means injects the calculated amount into the stack table.

[0020] The method includes an optimal electrolyte learning DB that collects the number of electrode sheets and the number of separators, combination data of the number of electrode sheets and separators, the thickness value of the electrode sheet and the thickness value of the separator, and combination data of the electrode sheet thickness value and the separator thickness value, and learns and classifies the optimal electrolyte injection amount according to the combination data of the number and the combination data of the thickness value; and the step of calculating the electrolyte injection amount may be characterized by inputting the measured combination data of the number and the combination data of the thickness value into the learning DB to calculate the optimal electrolyte injection amount.

[0021] In addition, the stacking step may be characterized by including at least one of the following: a step in which the pickup means, after gripping the electrode sheet, detects a change in the amount of induced current and a high-frequency magnetic field to determine the number of ejected electrode sheets; a step in which, if the number of electrode sheets is two or more by the sensor unit, a vibration module applies vibration to the gripped electrode sheet; and a step in which a heating module heats the gripped electrode sheet to expand the air layer so that only the uppermost electrode sheet is gripped.

[0022] The method may be characterized by including the following steps: storing alignment planar data and alignment side data in a database; capturing the electrode sheet and the separator stacked by the vision sensor; measuring the side of the electrode assembly stacked on the stack table by a side image acquisition unit; and determining position alignment by comparing the image data measured by the vision sensor with the alignment planar data, and determining whether alignment stacking is achieved by comparing the side data and side cross-sectional data measured by the side image acquisition unit with the alignment side data. Effects of the invention

[0023] According to the secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring according to an embodiment of the present invention, the thickness of each sheet is measured during the stacking process, and the appropriate electrolyte injection amount is calculated by matching the measured thickness and thickness combinations to the appropriate electrolyte injection amount data.

[0024] In addition, according to the secondary battery assembly system and assembly method capable of optimal injection and monitoring of the electrolyte according to an embodiment of the present invention, the number of extracted cells can be accurately determined by detecting a high-frequency magnetic field and a change in the amount of induced current, and when two or more cells are adsorbed, vibration or heat can be applied to cause them to detach from other unit cells, and after separation, the sensor unit can detect again to confirm whether only one cell remains and then feed it into a subsequent process, thereby having the effect of being able to be fed into a subsequent process.

[0025] In addition, according to the secondary battery assembly system and assembly method capable of optimal injection and monitoring of the electrolyte according to an embodiment of the present invention, the position alignment of the electrode sheet and separator can be measured using an upper vision sensor, and side data of the stacked assembly can be identified through a side image acquisition unit (X-ray, etc.) to determine the degree of misalignment and whether a short circuit has occurred between the current collectors.

[0026] Meanwhile, the effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present invention belongs from the description below. Brief explanation of the drawing

[0027] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a block diagram of a secondary battery assembly system capable of optimal electrolyte injection and monitoring according to an embodiment of the present invention. FIG. 2 is a flowchart of a secondary battery assembly method capable of optimal electrolyte injection and monitoring according to an embodiment of the present invention, FIG. 3 is a conceptual diagram of a pickup means according to an embodiment of the present invention, FIG. 4a is a configuration diagram of a pickup means having a sensor part according to an embodiment of the present invention, FIG. 4b is a configuration diagram of a sensor unit according to an embodiment of the present invention, FIG. 5 is a block diagram showing the signal flow of a determination unit according to an embodiment of the present invention, FIG. 6 is a block diagram showing the signal flow of a matching determination unit according to an embodiment of the present invention. Specific details for implementing the invention

[0028] The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete and to ensure that the spirit of the invention is sufficiently conveyed to a person skilled in the art.

[0029] In this specification, when a component is described as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. Also, in the drawings, the thicknesses of the components are exaggerated for the effective description of the technical content.

[0030] The embodiments described herein will be explained with reference to cross-sectional and / or plan views, which are exemplary illustrations of the invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of the technical content. Accordingly, the shapes of the exemplary drawings may be modified by manufacturing techniques and / or tolerances, etc. Accordingly, the embodiments of the invention are not limited to the specific shapes depicted but include variations in shape produced according to the manufacturing process. For example, a region depicted as a right angle may be rounded or have a certain curvature. Accordingly, the regions illustrated in the drawings have properties, and the shapes of the regions illustrated in the drawings are intended to illustrate specific shapes of the regions of the device and are not intended to limit the scope of the invention. Although terms such as first, second, etc., have been used to describe various components in the various embodiments of this specification, these components should not be limited by such terms. These terms are used merely to distinguish one component from another. The embodiments described and illustrated herein also include their complementary embodiments.

[0031] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components to the mentioned components.

[0032] In describing the specific embodiments below, various specific details have been included to explain the invention more specifically and to aid understanding. However, a reader with sufficient knowledge in the art to understand the invention will recognize that it can be used without these various specific details. In some cases, it is noted in advance that commonly known aspects that are not significantly related to the invention have been omitted to prevent unnecessary confusion in describing the invention.

[0034] Hereinafter, the configuration, function, and assembly method of a secondary battery assembly system capable of optimal electrolyte injection and monitoring according to an embodiment of the present invention will be described.

[0035] First, FIG. 1 illustrates a block diagram of a secondary battery assembly system capable of optimal electrolyte injection and monitoring according to an embodiment of the present invention.

[0036] Figure 2 illustrates a flowchart of a secondary battery assembly method capable of optimal electrolyte injection and monitoring according to an embodiment of the present invention.

[0037] The thickness measuring unit (200) according to an embodiment of the present invention is configured to measure the thickness of each electrode sheet (3) and separator stacked on a stack table (1).

[0038] And the injection amount calculation unit (400) calculates the amount of electrolyte injected into the stack table (1) based on the number data of the stacked electrode sheets (3), the number data of the separator, the measured thickness value data of the electrode sheets (3), and the thickness value data of the separator.

[0039] In addition, the electrolyte injection means (500) is configured to inject the calculated injection amount into the stack table (1).

[0040] And, a secondary battery assembly system capable of optimal electrolyte injection and monitoring according to an embodiment of the present invention is configured to include an optimal electrolyte learning DB (300).

[0041] The optimal electrolyte learning DB (300) is configured to collect the number of electrode sheets (3), the number of separators, combination data of the number of electrode sheets (3) and separators, the thickness value of the electrode sheet (3), the thickness value of the separator, and combination data of the thickness value of the electrode sheet (3) and the thickness value of the separator, and to learn and classify the optimal electrolyte injection amount according to the combination data of the number and the combination data of the thickness values.

[0042] Accordingly, the injection amount calculation unit (400) inputs the measured number combination data and thickness value combination data into the learning DB (300) to calculate the optimal electrolyte injection amount.

[0043] Referring to FIG. 2, a secondary battery assembly method capable of optimal injection and monitoring of the electrolyte according to an embodiment of the present invention is described as follows: First, a pickup means picks up an electrode sheet from an electrode magazine section in which electrode sheets are stacked (S1), moves it to the stack table, and stacks it.

[0044] At this time, as will be explained in detail later, during the stacking step, the pickup means (600) grasps the electrode sheet (3), and the sensor unit (610) detects the high-frequency magnetic field and the change in the amount of induced current to determine the number of electrode sheets (3) that have been extracted (S2, S3).

[0045] And when the number of electrode sheets (3) is two or more by the sensor unit (610), the vibration module (620) applies vibration to the electrode sheet (3) being held, or the heating module (630) heats the electrode sheet (3) being held to expand the air layer so that only the uppermost electrode sheet (3) is held (S4).

[0046] And in this stacking step, the thickness measuring unit (200) measures the thickness of each electrode sheet (3) and separator that are stacked on the stack table (1) (S5).

[0047] And as mentioned above, the number combination data and thickness value combination data (S6) are input into the learning DB (300) to calculate the optimal electrolyte injection amount (S7).

[0048] Then, the electrolyte injection means (500) injects the calculated injection amount into the stack table (S8).

[0049] Accordingly, according to the secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring according to the embodiment of the present invention, the thickness of each sheet is measured during the stacking process, and the appropriate electrolyte injection amount can be calculated by matching the measured thickness and thickness combinations with appropriate electrolyte injection amount data.

[0051] FIG. 3 illustrates a conceptual diagram of a pickup means according to an embodiment of the present invention.

[0052] The pickup means (600) picks up an electrode sheet (3) from an electrode magazine section (4) where electrode sheets (3) are stacked, moves it to a stack table (1), and stacks it.

[0053] That is, the pickup means (600) is configured to pick up the uppermost electrode among the electrodes stacked inside the electrode magazine section (4) and transfer it to the stack table (1).

[0054] At least one electrode magazine section (4) and pickup means (600) may be configured to include a heating module (630) that heats the uppermost electrode and the electrode in contact with the uppermost electrode among the electrodes stacked inside the electrode magazine section (4) to expand the air layer between the uppermost electrode and the electrode in contact with the uppermost electrode.

[0055] The pickup means (600) may be configured to include an electrode fixing part that fixes the uppermost electrode and an electrode transfer part that transfers the uppermost electrode fixed by the fixing part to the stack table side.

[0056] Additionally, it may further include a temperature sensor unit for measuring the surface temperature of the uppermost electrode and the electrode in contact with the uppermost electrode, and a temperature control unit for adjusting the temperature of the heating module (630) so that the surface temperature measured by the temperature sensor unit satisfies a controlled temperature range.

[0057] The temperature range for management is 40°C to 140°C, and the heating module (630) includes a non-contact heat source, and such non-contact heat source may be a radiant heat source, an induction heat source, or a laser heat source.

[0059] FIG. 4a illustrates a configuration diagram of a pickup means having a sensor unit according to an embodiment of the present invention. FIG. 4b illustrates a configuration diagram of a sensor unit according to an embodiment of the present invention. FIG. 5 illustrates a block diagram showing the signal flow of a discrimination unit according to an embodiment of the present invention.

[0060] A pickup means (600) according to an embodiment of the present invention comprises a sensor unit (610) that detects a change in the amount of high-frequency magnetic field and induced current after gripping an electrode sheet (3) and determines the number of electrode sheets (3) that have been extracted.

[0061] At this time, if the number of electrode sheets (3) is two or more by the sensor unit (610), it may include a vibration module (620) that applies vibration to the grasped electrode sheet (3) or a heating module (630) that heats the aforementioned grasped electrode sheet to expand the air layer so that only the uppermost electrode sheet is grasped.

[0062] The adsorption part of the pickup means (600) can be vertically lowered by the vertical movement part and can adsorb the electrode sheet (3) by applying a vacuum.

[0063] Next, the number of electrode sheets (3) adsorbed to the adsorption part is detected by the sensor part (610).

[0064] That is, a high-frequency magnetic field is generated from a detection coil (612) included in an inductive sensor of the sensor unit (610) and brought close to the electrode sheet (3), and the amount of change in resistance of the detection coil (612) is detected by a detection circuit according to the amount of induced current generated at that time, and the output circuit (611) is operated. For example, the result is transmitted to a control unit connected to the output circuit (611), and whether to proceed to the next step is determined according to the result. Here, the reading of the transmitted result can be performed by inputting a sensing range according to the number of electrode sheets (3) through repeated teaching and comparing it with it. For example, when two or more electrode sheets (3) are adsorbed, the amount of metal component close to the detection coil (612) increases, and therefore the change in resistance of the detection coil (612) according to the induced current becomes larger, so the sensing value differs from the case where one electrode sheet (3) is adsorbed, and through this, it can be determined whether only one electrode sheet (3) is adsorbed normally.

[0065] However, if the detection result is two or more, a separation operation is performed. That is, by applying vibration to the adsorption part or heating by the separation support, the other electrode sheet (3) other than the electrode sheet (3) in contact with the adsorption part can be detached.

[0066] Afterwards, the number of electrode sheets (3) after the separation operation is additionally detected by the sensor unit (610). According to this embodiment, after the number of electrode sheets (3) is detected again after the separation operation and it is confirmed that only one sheet is adsorbed, it is introduced into the subsequent process, so the occurrence of defects due to the additional supply of electrode sheets (3) can be reliably prevented.

[0067] Accordingly, according to the secondary battery assembly system and assembly method capable of optimal injection and monitoring of the electrolyte according to an embodiment of the present invention, the number of extracted cells can be accurately determined by detecting a high-frequency magnetic field and a change in the amount of induced current, and when two or more cells are adsorbed, vibration or heat can be applied to cause them to detach from other unit cells, and after separation, the sensor unit can detect again to confirm whether only one cell remains and then feed it into a subsequent process.

[0069] FIG. 6 is a block diagram showing the signal flow of a matching determination unit according to an embodiment of the present invention.

[0070] A vision sensor (60) according to an embodiment of the present invention is configured to image the stacked electrode sheet (3) and the separator.

[0071] And the judgment unit (100) determines the position of the electrode sheet and the separator and the position alignment based on the image data measured by the vision sensor (60).

[0072] In addition, according to an embodiment of the present invention, a side image acquisition unit (61) for measuring the side of an electrode assembly stacked on a stack table may be included. The side image acquisition unit according to an embodiment of the present invention may be composed of X-rays, etc.

[0073] In addition, the database (101) according to the embodiment of the present invention stores alignment planar data and alignment side data.

[0074] Accordingly, the judgment unit (100) determines position alignment by comparing the image data measured by the vision sensor (60) with the alignment plane data stored in the database.

[0075] Then, the side data and side cross-sectional data measured by the side image acquisition unit (61) are compared with the matching side data stored in the database to determine whether matching stacking is possible.

[0076] Accordingly, according to the secondary battery assembly system and assembly method capable of optimal electrolyte injection and monitoring according to the embodiment of the present invention, the position alignment of the electrode sheet and separator can be measured using an upper vision sensor, and the degree of misalignment and whether a short circuit has occurred between current collectors can be determined by identifying side data of the stacked assembly through a side image acquisition unit (X-ray, etc.). Explanation of the symbols

[0077] 3: Electrode sheet 4: Magazine Department 60: Vision sensor 61: Side view acquisition unit 100: Judgment part 101:Database 200: Thickness measuring unit 300: Optimal Electrolyte Learning DB 400: Injection Volume Calculation Unit 500: Electrolyte injection means 600: Pickup vehicle 610: Sensing unit 611: Output circuit 612: Detector coil 620: Vibration module 630: Heating module 640: Discriminant

Claims

Claim 1 A secondary battery assembly system for manufacturing an electrode assembly by stacking an electrode sheet coated with an active material and a separator on a stack table, comprising: a thickness measuring unit for measuring the thickness of each electrode sheet and separator stacked on the stack table; an injection amount calculation unit for calculating the amount of electrolyte injected into the stack table based on the number of electrode sheets and separator stacked, the measured thickness value of the electrode sheet, and the thickness value of the separator; an electrolyte injection means for injecting the calculated amount into the stack table; an optimal electrolyte learning DB for collecting the number of electrode sheets and separators, combination data of the number of electrode sheets and separators, the thickness value of the electrode sheet and the thickness value of the separator, and combination data of the electrode sheet thickness value and the separator thickness value, and learning and classifying the optimal electrolyte injection amount according to the combination data of the number and the combination data of the thickness values; and a vision sensor for imaging the stacked electrode sheet and separator. A secondary battery assembly system capable of optimal electrolyte injection and monitoring, comprising: a judgment unit that determines the position and position alignment of the electrode sheet and the separator based on image data measured by the vision sensor; a database that stores alignment planar data and alignment side data; and a side image acquisition unit that measures the side of the electrode assembly stacked on the stack table; wherein the injection amount calculation unit calculates the optimal electrolyte injection amount by inputting the measured number combination data and thickness value combination data into the learning DB, and the judgment unit determines position alignment by comparing the image data measured by the vision sensor with the alignment planar data, and determines whether alignment stacking is achieved by comparing the side data and side cross-sectional data measured by the side image acquisition unit with the alignment side data. Claim 2 delete Claim 3 A secondary battery assembly system capable of optimal electrolyte injection and monitoring, characterized in that, in claim 1, it includes a pickup means for picking up an electrode sheet from an electrode magazine section in which the electrode sheets are stacked, moving it to the stack table, and stacking it. Claim 4 A secondary battery assembly system capable of optimal electrolyte injection and monitoring, wherein, in claim 3, the pickup means further comprises a sensor unit that determines the number of extracted electrode sheets by detecting a high-frequency magnetic field and a change in the amount of induced current after gripping the electrode sheet. Claim 5 A secondary battery assembly system capable of optimal electrolyte injection and monitoring, characterized in that, in claim 4, when the number of electrode sheets is two or more by the sensor unit, it includes at least one of a vibration module that applies vibration to the gripped electrode sheet; and a heating module that heats the gripped electrode sheet to expand the air layer so that only the uppermost electrode sheet is gripped. Claim 6 delete Claim 7 delete Claim 8 A secondary battery assembly method capable of optimal electrolyte injection and monitoring using a secondary battery assembly system according to claim 1, comprising: a step in which a pickup means picks up an electrode sheet from an electrode magazine unit in which electrode sheets are stacked and moves it to a stack table for stacking; a step in which a thickness measuring unit measures the thickness of each electrode sheet and separator stacked on the stack table; a step in which an injection amount calculation unit calculates the amount of electrolyte to be injected into the stack table based on the number of stacked electrode sheets and separator number data, the measured thickness value of the electrode sheet, and the thickness value data of the separator; and a step in which an electrolyte injection means injects the calculated amount into the stack table. Claim 9 In claim 8, the method comprises an optimal electrolyte learning DB that collects the number of electrode sheets and the number of separators, combination data of the number of electrode sheets and separators, the thickness value of the electrode sheet and the thickness value of the separator, and combination data of the electrode sheet thickness value and the separator thickness value, and learns and classifies the optimal electrolyte injection amount according to the combination data of the number and the combination data of the thickness value; and the step of calculating the electrolyte injection amount is characterized by inputting the measured combination data of the number and the combination data of the thickness value into the learning DB to calculate the optimal electrolyte injection amount. Claim 10 A secondary battery assembly method capable of optimal electrolyte injection and monitoring, characterized in that, in the stacking step, the pickup means, after gripping the electrode sheet, includes a step of determining the number of ejected electrode sheets by detecting a high-frequency magnetic field and a change in the amount of induced current by a sensor unit; and if the number of electrode sheets is two or more by the sensor unit, a vibration module applies vibration to the gripped electrode sheet; and a heating module heats the gripped electrode sheet to expand the air layer so that only the uppermost electrode sheet is gripped. Claim 11 A secondary battery assembly method capable of optimal electrolyte injection and monitoring, characterized by comprising: a step of storing alignment planar data and alignment side data in a database in claim 10; a step of imaging the electrode sheet and the separator stacked by a vision sensor; a step of measuring the side of an electrode assembly stacked on a stack table by a side image acquisition unit; and a step of a judgment unit determining position alignment by comparing the image data measured by the vision sensor with the alignment planar data, and determining whether alignment stacking is achieved by comparing the side data and side cross-sectional data measured by the side image acquisition unit with the alignment side data.

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