Bag forming apparatus and bag forming method using same

Abstract

A pouch forming apparatus according to one embodiment of the present disclosure is configured to form an accommodating portion for accommodating an electrode assembly in a pouch sheet, and includes: a seating unit on which the pouch sheet is seated; a pressing plate that fixes the pocket piece to the seating unit by pressing the pocket piece; a lifting unit for vertically moving the pressing plate; and a forming unit that presses the pocket sheet to form the accommodating portion, wherein a sensor unit for measuring a pressure formed between the pressing plate and the seating unit is provided on an upper portion of the seating unit.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2023-0104551, filed on August 10, 2023, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

[0003] This disclosure relates to a bag forming apparatus, and more specifically, to a bag forming apparatus for forming the shape of a cell shell during the manufacturing process of a battery cell. Background Technology

[0004] The demand for rechargeable batteries is rapidly increasing as they gain attention as a source of power for drive systems such as electric bicycles, electric vehicles, and hybrid electric vehicles, as well as for mobile devices such as mobile phones, digital cameras, and laptops.

[0005] Based on the shape of the battery casing, secondary batteries can be classified into cylindrical batteries in which the electrode components are installed in a cylindrical metal container, prismatic batteries in which the electrode components are installed in a prismatic metal container, or pouch batteries in which the electrode components are installed in a pouch-shaped casing made of aluminum laminate.

[0006] In addition, electrode assemblies can generally be classified into jelly roll type (wound type) electrode assemblies having a structure in which long sheet-type positive and negative electrodes are wound with diaphragms inserted between them, stack type (laminated type) electrode assemblies having multiple positive and negative electrodes cut into units of a specified size and stacked sequentially with diaphragms inserted between them, and stack / folded type electrode assemblies having stacked unit cells wound with long diaphragms.

[0007] In the manufacturing process of a battery cell, the electrode assembly and electrolyte are sealed together in a defined casing. In the case of a pouch battery, this is achieved by forming a receiving portion within a pouch, then housing a stacked or stacked / folded electrode assembly within the receiving portion, and injecting electrolyte into the receiving portion. However, since the receiving portion is formed by fixing the pouch and then pressing it with a punch or similar tool, there is a problem that if the pressure is not properly adjusted, cracks or excessive wrinkles may appear within the pouch. Summary of the Invention

[0008] Technical issues

[0009] Therefore, this disclosure was designed to solve the above-mentioned problems. Thus, the purpose of this disclosure is to minimize cracks or wrinkles that occur in the pouch during the process of forming the battery cell pouch.

[0010] Technical solution

[0011] According to one embodiment of this disclosure, a bag forming apparatus is provided configured to form a receiving portion for accommodating an electrode assembly in a bag sheet. The bag forming apparatus includes: a placement unit for placing the bag sheet on the placement unit; a pressing plate for fixing the bag sheet to the placement unit by pressing the bag sheet; a lifting unit for vertically moving the pressing plate; and a forming unit for pressing the bag sheet to form the receiving portion. A sensor unit is provided on the upper part of the placement unit for measuring the pressure formed between the pressing plate and the placement unit.

[0012] The upper part of the placement unit is provided with a receiving groove for forming the receiving part, and the sensor unit may not correspond to the receiving groove.

[0013] The upper part of the placement unit is provided with a receiving groove for forming the receiving portion, and the pressing plate can press the bag piece located in the portion of the placement unit where the receiving groove is not formed.

[0014] The lifting units are formed in multiple units, and the multiple lifting units can operate independently of each other.

[0015] The sensor unit may include a surface pressure sensor.

[0016] The sensor unit acquires pressure values ​​based on its respective position, calculates the position of the center of gravity based on the pressure values, and can display the pressure values ​​based on its respective position as relative values ​​with respect to the pressure values ​​formed at the center of gravity.

[0017] The pressure between the placement unit and the pressing plate changes according to the operation of the lifting unit, allowing the position of the center of gravity to move.

[0018] The lifting unit can operate based on the pressure value obtained through the sensor unit.

[0019] The lifting unit includes a first lifting unit and a second lifting unit, and one of the first lifting unit and the second lifting unit can operate based on the pressure value obtained from the sensor unit, thereby adjusting the tilt of the pressing plate.

[0020] According to another embodiment of this disclosure, a bag forming method is provided, which may include: a step of placing a bag sheet on a placement unit; a step of pressing the bag sheet with a pressing plate to fix the bag sheet on the placement unit; a step of adjusting the inclination of the pressing plate by a lifting unit based on a pressure value obtained by a sensor unit; and a step of pressing the bag sheet with the forming unit to form a receiving portion in the bag sheet.

[0021] The step of adjusting the tilt of the pressing plate may include: calculating the position of the center of gravity based on the pressure value obtained by the sensor unit; comparing the calculated position of the center of gravity with a pre-stored position of the center of gravity; and operating the lifting unit to make the calculated position of the center of gravity consistent with the pre-stored position of the center of gravity, thereby adjusting the tilt of the pressing plate.

[0022] Beneficial effects

[0023] According to one aspect of this disclosure, when forming the bag-shaped shell, the bag sheet can be pressed with appropriate pressure to minimize the occurrence of cracks or wrinkles formed in the bag sheet.

[0024] Furthermore, this disclosure may have various other effects, and such effects will be described in various embodiments, or any effects that can be readily inferred by those skilled in the art will not be described in detail. Attached Figure Description

[0025] Figure 1 This is a side view of a standard bag forming machine.

[0026] Figure 2 This is an explanation based on Figure 1 A diagram illustrating the operation of a bag forming machine.

[0027] Figure 3 It is based on Figure 1 A top view of the lower die of the bag forming equipment.

[0028] Figure 4 This is a side view of a bag forming apparatus according to one embodiment of the present disclosure.

[0029] Figure 5 It is based on Figure 4 A top view of the placement unit of the bag forming equipment.

[0030] Figure 6 It shows the relationship with the data. Figure 4 The position of the lifting unit corresponding to the sensor unit of the bag forming equipment.

[0031] Figure 7 and Figure 8This is a diagram illustrating the operation of a bag forming apparatus according to one embodiment of the present disclosure.

[0032] Figure 9 This is a flowchart of a bag forming method according to one embodiment of the present disclosure. Detailed Implementation

[0033] In the following, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The terminology used in the specification and appended claims should not be construed as limited to its general and dictionary meaning, but rather as having a meaning and concept consistent with the technical aspects of the present disclosure, based on the inventor's ability to appropriately define the concepts of the terms to best interpret the invention. Therefore, the embodiments described in the specification and the configurations shown in the drawings are merely the most ideal embodiments of the present disclosure and do not fully encompass the spirit of the present disclosure. Therefore, it should be understood that various equivalents and modifications can be made to replace them when this application is filed.

[0034] In the accompanying drawings, for ease of description and clarity, the dimensions of individual components or specific parts constituting components are exaggerated, omitted, or shown schematically. Therefore, the dimensions of the individual elements do not perfectly reflect their actual dimensions. Furthermore, detailed descriptions relating to well-known functions or configurations will be omitted where it would unnecessarily obscure the subject matter of this disclosure.

[0035] Furthermore, it should be understood that when an element such as a layer, membrane, region, or plate is described as being "on" or "above" another element, it may be directly on the other element, or there may be intermediate elements present. Conversely, when an element is described as being "directly" "on" another element, it means that there are no other intermediate elements present. Additionally, the terms "on" or "above" mean arranged on or below a reference portion, and do not necessarily mean arranged at the upper end of the reference portion in the opposite direction to gravity. Similarly, the description of being "below" or "under" another component should also be understood with reference to the above.

[0036] Furthermore, throughout the specification, when a section is referred to as "comprising" or "including" a component, unless otherwise stated, it means that the section may further include other components, without excluding other components.

[0037] Furthermore, throughout the instruction manual, when referred to as a "plane," it means when viewing the target portion from above, and when referred to as a "section," it means when viewing the target portion from one side of a vertically cut section.

[0038] The bag forming apparatus according to embodiments of the present disclosure is used to form a receiving portion in a bag sheet for accommodating an electrode assembly.

[0039] Before describing the bag forming apparatus according to embodiments of the present disclosure, conventional bag forming apparatus will be described first.

[0040] Figure 1 This is a side view of a standard bag forming machine. Figure 2 This is an explanation based on Figure 1 A diagram illustrating the operation of a bag forming machine. Figure 3 It is based on Figure 1 A top view of the lower die of the bag forming equipment.

[0041] Reference Figure 1 A conventional bag forming device 10 may include: a lower mold 11 on which a bag sheet 1 is placed; a demolding device 12 that presses the bag sheet 1 from above to fix it to the lower mold 11; a cylinder 13 that moves the demolding device 12 vertically; and a punch 14 that presses the bag sheet 1 from above to form a receiving portion 2. Here, the lower mold 11 is located on a back plate 22, and a shim 21 may be provided between the lower mold 11 and the back plate 22.

[0042] like Figure 2 As shown, the bag forming process using the bag forming equipment 10 can be performed by placing the bag sheet 1 on the upper surface of the lower mold 11 on which the forming groove 11A is formed, then fixing the edge of the bag sheet 1 with the demolding device 12, and then moving the punch 14 vertically to deform the bag sheet 1.

[0043] However, during this process, the bag sheet 1 may be damaged or wrinkles may form at the corners of the receiving portion 2, requiring the operator to properly adjust the pressure of the release device 12 that holds the bag sheet 1 in place. Typically, the pressure of the release device 12 can be adjusted by vertically moving it using the cylinder 13; however, it is conventionally difficult to accurately determine the magnitude of the pressure applied to the bag sheet 1, making it difficult to adjust the pressure of the release device 12. Therefore, conventionally, as... Figure 3 As shown, to adjust the pressure acting on the bag sheet 1, either an arbitrary control cylinder 13 or a shim 21 is added between the lower mold 11 and the back plate 22. However, such conventional methods suffer from reduced precision and uneven final product quality. Furthermore, the installation and removal of the mold requires a significant amount of time and effort from the operator.

[0044] Next, a bag forming apparatus according to one embodiment of the present disclosure will be described. The bag forming apparatus of this embodiment is designed to solve the problems of conventional technology and aims to minimize wrinkles or cracks formed in the bag sheet 1 by more precisely adjusting the pressure applied to the bag sheet 1.

[0045] Figure 4 This is a side view of a bag forming apparatus according to one embodiment of the present disclosure. Figure 5It is based on Figure 4 A top view of the placement unit of the bag forming equipment. Figure 6 It shows the relationship with the data. Figure 4 The position of the lifting unit corresponding to the sensor unit of the bag forming equipment.

[0046] Reference Figure 4 The bag forming apparatus 100 of this embodiment may include: a placement unit 110 on which a bag sheet 1 is placed; a pressing plate 120 for fixing the position of the bag sheet 1; a lifting unit 130 for vertically moving the pressing plate 120; a forming unit 140 for forming a receiving portion 2 that houses an electrode assembly by pressing the bag sheet 1; and a sensor unit 150 for measuring the pressure acting on the bag sheet 1.

[0047] The placement unit 110 can provide operating space for forming the receiving portion 2 in the bag piece 1. The placement unit 110 can be located on the underside of the bag piece 1. The placement unit 110 can be a die. However, this is not necessarily the case, and the placement unit can be configured to have a function similar to that of a die.

[0048] A receiving groove 112 can be formed on the upper surface of the placement unit 110. The receiving groove 112 can accommodate the bag sheet 1 pressed by the forming unit 140, thereby forming a receiving portion 2 in the bag sheet 1. The bag sheet 1 can be configured to cover the receiving groove 112 formed on the upper surface of the placement unit 110.

[0049] Here, the bag 1 may comprise aluminum. However, the physical properties of the bag 1 are not limited to the examples described above, and any known material may be used, provided that it has a predetermined hardness and is capable of stably accommodating the electrode assembly and electrolyte.

[0050] The pressing plate 120 can be used to fix the position of the bag piece 1. The pressing plate 120 can be located on the upper side of the placement unit 110. The pressing plate 120 can be located on the upper side of the bag piece 1. The pressing plate 120 can fix the bag piece 1 to the placement unit 110 by pressing the bag piece 1. The pressing plate 120 can be a stripper, but it is not necessarily the case.

[0051] The pressing plate 120 may have a shape in which the outer edge corresponds to the outer edge of the placement unit 110, but not to the receiving groove 112. As a specific example, the pressing plate 120 may have a square plate shape or a shape with the central portion removed.

[0052] The pressing plate 120 can press the edge of the bag piece 1. More specifically, the pressing plate 120 can press the portion of the bag piece 1 located in the placement unit 110 where the receiving groove 112 is not formed. The pressing plate 120 can press the outer side of the edge of the receiving portion 2 in the bag piece 1. In this way, the pressing plate 120 does not need to correspond to the receiving groove 112 and the receiving portion 2 of the bag piece 1, so the vertical movement of the forming unit 140 forming the receiving portion 2 can be unrestricted. At this time, the receiving portion 2 can be interpreted broadly as not only referring to the already formed receiving portion 2 in the bag piece 1, but also to the position in the bag piece 1 where the receiving portion 2 is formed.

[0053] The lower part of the pressing plate 120 can press the bag sheet 1 by contacting it, or by other components that contact the bag sheet 1 directly or indirectly. The lifting unit 130 can be located on the upper part of the pressing plate 120, wherein the lifting unit adjusts the pressure applied to the bag sheet 1 from the pressing plate 120 by vertically moving the pressing plate 120.

[0054] The lifting unit 130 can move the pressing plate 120 vertically. The lifting unit 130 can increase the pressure applied to the bag sheet 1 by lowering the pressing plate 120. Furthermore, the lifting unit 130 can decrease the pressure applied to the bag sheet 1 by raising the pressing plate 120. The lifting unit 130 can be a cylinder that moves an object by the movement of a pneumatic piston, but it does not necessarily have to be this type of unit.

[0055] The lifting unit 130 may be equipped with a pressure sensor. For example, the lifting unit 130 may utilize air pressure to move the pressing plate 120, and the lifting unit 130 may be equipped with a regulating valve (e.g., a solenoid valve, etc.) for regulating air pressure and a pressure sensor for measuring air pressure. The displacement level of the pressing plate 120 can be estimated by the pressure sensor provided in the lifting unit 130, and the pressure applied to the bag flap 1 by the pressing plate 120 can be estimated. However, since the pressure applied to the bag flap 1 can vary depending on the flatness of the placement unit 110, it is unreasonable to rely on the pressure sensor provided in the lifting unit 130 to estimate the pressure of the bag flap 1. Furthermore, since the value collected by the pressure sensor provided in the lifting unit 130 is the pressure formed in a narrower area, the error may be large when representing the pressure value of the bag flap 1 in a wider area.

[0056] Multiple lifting units 130 can be configured, and each can be operated independently. For example... Figure 6As shown, multiple lifting units 130 can be arranged along the edge of the placement unit 110. The tilt of the pressing plate 120 can be changed by operating some of the lifting units 130 to adjust the rise and fall of the pressing plate 120. By adjusting the tilt of the pressing plate 120, the pressing plate 120 can locally press the bag piece 1 or reduce the pressure acting on the bag piece 1. As a specific example, if the pressing plate 120 is lowered by the lifting unit 130 located on the -X axis at a higher level than it is lowered by the other lifting units 130, the portion of the bag piece 1 located on the -X axis can be pressed more forcefully than the other portions. Since the multiple lifting units 130 operate independently in this manner, the pressure applied to the bag piece 1 located between the pressing plate 120 and the placement unit 110 can be uniformly adjusted.

[0057] The forming unit 140 can form a receiving portion 2 in the bag piece 1. The forming unit 140 can be located on the upper side of the bag piece 1. The forming unit 140 can be located at a position corresponding to the receiving groove 112 of the placement unit 110. The forming unit 140 can press the bag piece 1 along the direction of the receiving groove 112 and can form a receiving portion 2 with a shape corresponding to the receiving groove 112 in the bag piece 1. The receiving portion 2 can have a recessed shape from one surface of the bag piece 1 toward another surface. The forming unit 140 can form the receiving portion 2 by descending toward the bag piece 1, and after the forming of the receiving portion 2 is completed, the forming unit 140 can rise again and return to its original position.

[0058] Here, the end of the forming unit 140 can be accommodated in the receiving groove 112. For this purpose, the cross-sectional area of ​​the end of the forming unit 140 can be smaller than the cross-sectional area of ​​the receiving groove 112. Furthermore, the portion of the forming unit 140 inserted into the receiving groove 112 can be separated from the inner surface of the receiving groove 112 by a gap equal to or greater than the thickness of the bag sheet 1.

[0059] The sensor unit 150 can be used to measure the pressure applied to the bag sheet 1. The bag forming apparatus 100 of this embodiment collects the pressure value applied to the bag sheet 1 through the sensor unit 150, and controls the lifting unit 130 based on the collected value, thereby making the pressure applied to the bag sheet 1 uniform.

[0060] The sensor unit 150 may be located between the mounting unit 110 and the pressing plate 120. The sensor unit 150 may be disposed on the upper part of the mounting unit 110. The bag sheet 1 may be located above the sensor unit 150. The pressure applied to the bag sheet 1 may vary depending on whether the mounting unit 110 is placed flat, etc. Therefore, in this embodiment, the sensor unit 150 may be disposed on the upper part of the mounting unit 110 to directly measure the pressure applied to the bag sheet 1.

[0061] like Figure 5 As shown, the sensor unit 150 can be located outside the edge of the receiving groove 112 on the upper surface of the mounting unit 110. The sensor unit 150 can also be located at a position on the upper surface of the mounting unit 110 where the receiving groove 112 is not formed. The sensor unit 150 may not correspond to the receiving groove 112. The sensor unit 150 may correspond to the lower surface of the pressing plate 120. Here, the upper surface and lower surface can refer to the surface located at the top and the surface located at the bottom relative to each other with respect to the Z-axis.

[0062] Sensor unit 150 may include a sensor capable of measuring pressure formed on a plane at high resolution. For example, sensor unit 150 may include a surface pressure sensor. Here, the surface pressure sensor is suitable for measuring surface pressure, has high resolution, and can have small measurement errors even when applied to multiple areas. The sensor unit 150 of this embodiment can be designed to cover a wide area by using a surface pressure sensor, and can accurately collect pressure values ​​according to their respective locations.

[0063] On the other hand, since the sensor unit 150 is located on the upper part of the placement unit 110, it can be pressed together with the bag sheet 1 by the pressing plate 120. Therefore, it is preferable that the thickness value of the sensor unit 150 is small and that the thickness value is minimized according to the positional deviation. For example, it is preferable that the thickness value of the sensor unit 150 is within 0.01 mm to 0.5 mm or 0.2 mm to 0.4 mm.

[0064] The pressure values ​​measured by sensor unit 150 can be output as a pressure distribution. The pressure values ​​measured by sensor unit 150 can also be output as coordinate values ​​based on their respective locations. The measured pressure values ​​can be displayed in quadrants extending from a single point along the front-back and left-right directions.

[0065] The sensor unit 150 may include multiple grid-shaped sub-sensors, and the position of each grid can be represented as X-axis and Y-axis coordinates when outputting results. Furthermore, the corresponding pressure values ​​can be represented as values ​​on the corresponding coordinates. For example, when it is desired to cover a 10*10ch range, the surface pressure sensor can be configured to include 10 1ch*1ch sub-sensors in both the horizontal and vertical directions. In this way, pressure values ​​at approximately 100 locations within the 10*10ch range can be collected.

[0066] Here, the output pressure value can be a relative value with respect to a reference position. The output pressure value can be a pressure distribution value based on the center of gravity. For example, when the center of gravity is located at the center of the sensor unit 150, if the pressure value at each position is higher than the pressure value formed at the center, it can be represented as +, and if the pressure value at each position is lower than the pressure value formed at the center, it can be represented as -.

[0067] Additionally, although not shown in the figures, the bag forming apparatus 100 of this embodiment may include a control unit that integrates the operation of the bag forming apparatus 100.

[0068] The control unit can receive pressure values ​​collected from the sensor unit 150. The control unit can calculate the pressure values ​​received from the sensor unit 150 in a coordinate system. In addition, the control unit can control the output unit included in the bag forming equipment 100 or the output unit connected to the bag forming equipment 100 to display the processed pressure values.

[0069] However, as mentioned above, the processing of pressure values ​​does not necessarily have to be performed by the control unit of the bag forming equipment 100, and according to the embodiment, the sensor unit 150 may include a control unit separately, and the pressure value may be calculated in a coordinate system by the control unit included in the sensor unit 150.

[0070] The control unit can locally adjust the pressure applied to the bag 1. Based on the pressure value obtained through the sensor unit 150, the control unit controls the operation of the lifting unit 130 to ensure uniform pressure applied to the bag 1. The control unit can control the operation of the lifting unit 130 to move the center of gravity of the bag 1 to a preset center of gravity. (See below for further details.) Figure 7 and Figure 8 This will be described in more detail.

[0071] Figure 7 and Figure 8 This is a diagram illustrating the operation of a bag forming apparatus according to one embodiment of the present disclosure. Figure 7 In the text, the dashed lines are only used to divide the lifting unit 130 according to its position and are not included in the content of this disclosure.

[0072] Reference Figure 7 and Figure 8 In this embodiment, the lifting unit 130 can control its operation based on the pressure value obtained by the sensor unit 150.

[0073] Reference Figure 7 In this embodiment, the lifting unit 130 can be formed in multiple ways. For ease of explanation, the lifting unit 130 can be divided into a first lifting unit 131, a second lifting unit 132, a third lifting unit 133, and a fourth lifting unit 134 according to its position. Here, the first lifting unit 131 is the lifting unit 130 located in the -X-axis direction, the second lifting unit 132 is the lifting unit 130 located in the -Y-axis direction, the third lifting unit 133 is the lifting unit 130 located in the +X-axis direction, and the fourth lifting unit 134 is the lifting unit 130 located in the +Y-axis direction.

[0074] The sensor unit 150 can measure the pressure applied to the bag sheet 1 after the bag sheet 1 is positioned on the placement unit 110 and the pressing plate 120 is lowered to press the bag sheet 1. The sensor unit 150 can measure the pressure formed between the edge of the placement unit 110 and the pressing plate 120. The sensor unit 150 can acquire the magnitude of the pressure formed on the outer side of the edge of the receiving portion 2 according to its position. The pressure value according to its respective position can be displayed as a value calculated based on the center of gravity of the current state. Figure 8 As shown, the initial output value can be the pressure distribution value based on the first centroid c1.

[0075] Furthermore, the operator may desire a state where the deviations of each pressure are minimized and distributed with the value of the second center of gravity c2 as a reference. Here, the value of the second center of gravity c2 desired by the operator can vary depending on the mold that determines the shape of the receiving portion 2. Therefore, the second center of gravity c2 can be a value input by the operator or a value that has been pre-stored. In order to receive the input of the predetermined value from the user in this way, the bag forming equipment 100 may include an input unit, or may be connected to an external device that includes an input unit. In addition, the bag forming equipment 100 may include a storage unit capable of storing the input value.

[0076] The lifting unit 130 can move the position of the center of gravity by adjusting the horizontal movement of the vertical movement of the pressing plate 120. More specifically, based on the position of the first center of gravity c1, it can be inferred that the third lifting unit 133 and the fourth lifting unit 134, located in the +X and +Y axis directions, apply greater pressure to the bag sheet 1 than the first lifting unit 131 and the second lifting unit 132, located in the -X and -Y axis directions. Therefore, by further lowering the first lifting unit 131 and the second lifting unit 132, or further raising the third lifting unit 133 and the fourth lifting unit 134, the position of the center of gravity can be moved from the first center of gravity c1 to the second center of gravity c2. The operation of the lifting unit 130 can be controlled by a control unit.

[0077] At this time, sensor unit 150 can collect pressure values ​​in real time and calculate the collected pressure values ​​according to a predetermined algorithm, and then output them. Therefore, after the operation of lifting unit 130 is completed, the position of the center of gravity can be reconfirmed by sensor unit 150. Lifting unit 130 can be operated until the calculated position of the center of gravity is consistent with the second center of gravity c2, thereby adjusting the tilt of pressing plate 120. If the calculated position of the center of gravity is consistent with the second center of gravity c2, it can be determined that the pressure applied to the bag sheet 1 is uniform. If the calculated position of the center of gravity is the second center of gravity c2 expected by the operator, the operation of lifting unit 130 can be interrupted. If it is confirmed based on the output value of sensor unit 150 that the pressure applied to the bag sheet 1 is uniform, the operation of lifting unit 130 can be interrupted, and forming unit 140 can be lowered to form receiving portion 2 in bag sheet 1. The operation of lifting unit 130 or forming unit 140 in this way can be performed by control unit. In addition, the information collected from sensor unit 150 can also be processed by control unit.

[0078] Next, a bag forming method based on the above description will be described. The bag forming method described below can be performed by the bag forming equipment 100 described above. Therefore, all of the above content can be applied to the following description, and identical descriptions will be omitted to avoid redundancy.

[0079] Figure 9 This is a flowchart of a bag forming method according to one embodiment of the present disclosure.

[0080] Reference Figure 9 The bag forming method (S100) according to this embodiment may include: a step of placing the bag sheet 1 on the placement unit 110 (S110); a step of fixing the bag sheet 1 to the placement unit 110 by pressing plate 120 (S120); a step of operating lifting unit 130 based on pressure value obtained by sensor unit 150 (S130S); and a step of forming receiving portion 2 in bag sheet 1 by forming unit 140 (S140S).

[0081] The following section will describe each step in more detail.

[0082] The bag piece 1 can be placed on the upper surface of the placement unit 110 (S110). The placement unit 110 may include a receiving groove 112 formed on the upper surface of the placement unit 110. The bag piece 1 may be configured to cover the receiving groove 112 formed on the upper surface of the placement unit 110.

[0083] The pressing plate 120 secures the bag sheet 1 to the placement unit 110 (S120). The pressing plate 120 can be located above the bag sheet 1 and the placement unit 110. The pressing plate 120 can descend toward the bag sheet 1, and the descent of the pressing plate 120 can be achieved by the operation of the lifting unit 130. The pressing plate 120 can press other areas of the bag sheet 1 except for the area forming the receiving portion 2, thereby making it in close contact with the placement unit 110. The pressing plate 120 secures the bag sheet 1 to the placement unit 110, thereby minimizing the flow of the bag sheet 1 during the process of forming the receiving portion 2 by the operation of the forming unit 140.

[0084] Sensor unit 150 collects the pressure value formed between pressing plate 120 and placement unit 110, and lifting unit 130 can operate based on the collected pressure value (S130). Sensor unit 150 can be located on placement unit 110 and can collect the pressure value formed between pressing plate 120 and placement unit 110. The pressure value obtained by sensor unit 150 can be considered as the pressure value formed on bag sheet 1. Here, the pressure value obtained by sensor unit 150 can be the value after pressing plate 120 has finished descending.

[0085] The pressure value acquired by the sensor unit 150 can be calculated by the control unit, etc., and then output by the output unit, etc. The pressure value acquired by the sensor unit 150 can vary depending on its position, and can be represented on the X and Y axes according to the pressure value at its respective position.

[0086] The lifting unit 130 can operate based on the pressure value obtained by the sensor unit 150. The lifting unit 130 can be operated to move the position of the center of gravity, confirmed by the sensor unit 150, to a preset center of gravity position by adjusting the tilt angle of the pressing plate 120. More specifically, in order to form a uniform pressure distribution, the lifting unit 130 in the direction from the current center of gravity position to the preset center of gravity position can be operated to locally lower the pressing plate 120. Furthermore, the lifting unit 130 in the opposite direction can be operated to locally raise the pressing plate 120. Related details are described above. Figure 7 and Figure 8 .

[0087] The sensor unit 150 can acquire pressure values ​​in real time. After the lifting unit 130 completes its operation, the sensor unit 150 can acquire the pressure value. The position of the center of gravity can be recalculated based on the newly acquired pressure value. If the newly confirmed position of the center of gravity differs from the preset position, the lifting unit 130 can be operated again to partially raise or lower the pressing plate 120 to align them. The lifting unit 130 can be operated until the position of the center of gravity calculated by the sensor unit 150 matches the current position of the center of gravity.

[0088] Therefore, the above step (S130S) may include:

[0089] The steps include: acquiring pressure values ​​via sensor unit 150, processing the acquired pressure values, and outputting the position of the center of gravity in the current state; comparing the preset position of the center of gravity with the position of the center of gravity in the current state; and operating lifting unit 130 based on the difference between the preset position of the center of gravity and the position of the center of gravity in the current state, and adjusting the tilt of the pressing plate according to the operation of lifting unit 130. Furthermore, the above procedures can be repeated until the preset center of gravity and the center of gravity in the current state are the same.

[0090] Furthermore, the operation of the lifting unit 130 can be performed in the following manner:

[0091] The steps include: calculating a set pressure value requested from the lifting unit 130 based on the pressure value obtained from the sensor unit 150; driving the lifting unit 130 based on the set pressure value; measuring the pressure value formed by the lifting unit 130 through the pressure sensor installed in the lifting unit 130 and comparing the measured pressure value with the preset pressure value; and driving the lifting unit 130 based on the difference between the collected pressure value and the set pressure value if they are not equal. Furthermore, the steps of comparing the two values ​​and driving the lifting unit 130 based on the difference can be repeated until the two values ​​are equal.

[0092] On the other hand, when the lifting unit 130 is a cylinder that uses air pressure, the lifting unit 130 may include a solenoid valve or the like for regulating airflow. Therefore, the opening / closing level of the solenoid valve of the lifting unit 130 can be determined according to the required set pressure value. That is, the operation of the lifting unit 130 described above can be performed by opening / closing the solenoid valve. Furthermore, a pressure sensor installed in the lifting unit 130 can measure air pressure according to the opening / closing of the solenoid valve.

[0093] When the position of the center of gravity calculated by the sensor unit 150 is the same as the preset position of the center of gravity and the operation of the lifting unit 130 is completed, the forming unit 140 can form a receiving groove 112 in the bag piece 1 (S140S). The forming unit 140 is located on the upper side of the bag piece 1 and can descend toward the bag piece 1. The position of the forming unit 140 corresponds to the receiving groove 112 of the placement unit 110 and can descend toward the receiving groove 112. At this time, the end of the forming unit 140 can be inserted into the receiving groove 112. By receiving a part of the bag piece 1 together with the end of the forming unit 140 in the receiving groove 112, a receiving portion 2 recessed on the lower side can be formed in the bag piece 1.

[0094] On the other hand, the bag forming method can be executed by a control unit included in the bag forming equipment 100. More specifically, operations such as displacing the pressing plate 120 via the lifting unit 130, lowering the forming unit 140, and collecting pressure values ​​from the sensor unit 150 can be controlled by the control unit included in the bag forming equipment 100.

[0095] Although the present invention has been described in detail above with reference to preferred embodiments thereof, the scope of this disclosure is not limited thereto, and those skilled in the art can make various modifications and improvements using the basic concepts of this disclosure as defined in the appended claims, and such modifications and improvements also fall within the scope of this disclosure.

[0096] [Reference Marker Explanation]

[0097] 1: Bag-shaped pieces

[0098] 100: Bag forming equipment

[0099] 110: Installation Unit

[0100] 120: Press plate

[0101] 130: Lifting Unit

[0102] 140: Forming unit

[0103] 150: Sensor unit.

Claims

1. A bag forming apparatus configured to form a receiving portion for receiving an electrode assembly in a bag sheet, the bag forming apparatus comprising: The placement unit, on which the bag sheet is placed, The pressing plate, by pressing the bag sheet, secures the bag sheet to the placement unit. A lifting unit that causes the pressing plate to move vertically, and A forming unit presses the bag sheet to form the receiving portion. A sensor unit is provided on the upper part of the placement unit, and the sensor unit is used to measure the pressure formed between the pressing plate and the placement unit.

2. The bag forming equipment according to claim 1, wherein: The upper part of the placement unit is provided with a receiving groove for forming the receiving part, and the sensor unit does not correspond to the receiving groove.

3. The bag forming equipment according to claim 1, wherein: The upper part of the placement unit is provided with a receiving groove for forming the receiving part, and The pressing plate presses down on the bag piece located in the portion of the placement unit where the receiving groove is not formed.

4. The bag forming equipment according to claim 1, wherein: The lifting units are formed in multiple units, and the multiple lifting units operate independently of each other.

5. The bag forming equipment according to claim 1, wherein: The sensor unit includes a surface pressure sensor.

6. The bag forming equipment according to claim 1, wherein: The sensor units acquire pressure values ​​based on their respective locations. The position of the center of gravity is calculated based on the pressure value, and the pressure value according to the respective position is displayed as a relative value based on the pressure value formed at the center of gravity.

7. The bag forming equipment according to claim 6, wherein: The pressure between the placement unit and the pressing plate changes according to the operation of the lifting unit, causing the position of the center of gravity to shift.

8. The bag forming equipment according to claim 1, wherein: The lifting unit operates based on the pressure value obtained through the sensor unit.

9. The bag forming equipment according to claim 8, wherein: The lifting unit includes a first lifting unit and a second lifting unit, and One of the first lifting unit and the second lifting unit operates based on the pressure value obtained from the sensor unit, thereby adjusting the tilt of the pressing plate.

10. A bag forming method using the bag forming apparatus according to claim 1, the method comprising: The steps for placing the bag sheet on the placement unit. The step of fixing the bag piece to the placement unit by pressing the bag piece with a pressing plate. Based on the pressure value obtained by the sensor unit, the step of adjusting the tilt of the pressing plate by the lifting unit, and The step of pressing the bag sheet by the forming unit to form a receiving portion in the bag sheet.

11. The bag forming method according to claim 10, wherein: The steps for adjusting the tilt of the pressing plate include: The step of calculating the position of the center of gravity based on the pressure value obtained by the sensor unit. The step of comparing the calculated position of the center of gravity with the pre-stored position of the center of gravity, and The step of operating the lifting unit to make the calculated center of gravity position consistent with the pre-stored center of gravity position, thereby adjusting the tilt of the pressing plate.

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