System and method for manufacturing secondary battery

Abstract

The present invention relates to a system and method for manufacturing a secondary battery, and provides a system and method for manufacturing a secondary battery that sucks air inside a loading part in a direction opposite to a conveying direction so as to prevent a basic unit that freely falls with an initial speed in the conveying direction from colliding with the loading part, thereby reducing a folding short defect that occurs in a subsequent process. The system for manufacturing a secondary battery includes a conveying part configured to convey a basic unit, a loading part into which the basic unit conveyed by the conveying part falls along a direction of gravity, thereby loading the basic unit, and an air intake part configured to suck air in an internal space of the loading part from a side surface of the loading part.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0029070, filed on March 4, 2021, and Korean Patent Application No. 10-2022-0027707, filed on March 3, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to systems and methods for manufacturing secondary batteries, and more specifically, to a system and method for manufacturing secondary batteries that evacuates air from the interior of a loading section in a direction opposite to the conveying direction in order to prevent basic units falling freely at an initial velocity in the conveying direction from colliding with the loading section, thereby reducing folding short-circuit defects that occur in subsequent processing. Background Technology

[0004] Unlike non-rechargeable primary batteries, secondary batteries are rechargeable and dischargeable. They are widely used not only in small electronic devices such as mobile phones and laptops, but also in large products requiring high output, such as electric vehicles, power storage devices for storing surplus or renewable energy, and backup power storage systems (ESS).

[0005] Secondary batteries have a structure in which electrode assemblies and electrolytes are embedded in a casing (e.g., a can or bag). The electrode assembly has a structure in which positive electrodes, separators, and negative electrodes are repeatedly stacked. Typically, electrode assemblies can be classified into jelly roll (wound) electrode assemblies manufactured by winding long sheet-like positive and negative electrodes with separators between them, stacked electrode assemblies manufactured by sequentially stacking multiple positive and negative electrodes cut into multiple units of predetermined size and separated from each other, and stacked folded electrode assemblies.

[0006] Recently, a lamination / stacking method has been developed as a new approach for manufacturing electrode assemblies, thereby increasing energy density in the same space and reducing processing time.

[0007] Regarding the manufacturing process according to the lamination / stacking method, cut electrodes are placed at predetermined intervals on top of one or more continuously supplied separators. Subsequently, in a heat treatment, the electrodes are bonded to the separators, thereby increasing the adhesion between the separators and electrodes. In the bonding process, the electrode stack (formed as a cell or basic unit spaced apart by a predetermined distance) with the separators and electrodes stacked together is passed through a pair of rollers for rolling, thereby bonding the electrodes and separators together by heat and pressure. Afterward, the stacked electrodes and separators are cut into cell units, and the cut cell units are conveyed and stacked to form electrode assemblies.

[0008] exist Figure 1 The image shows a system for manufacturing secondary batteries according to the prior art. See also: [reference needed]. Figure 1 In the stacking process of cell units, the cut cell unit 1 is conveyed by a conveyor device 2, such as a conveyor belt, and pressed by a pusher 3, thereby separating it from the conveyor device 2 and dropping it into a hopper 4 located below the conveyor device 2, where it is loaded. Unlike existing technologies, in recent years, due to increased processing line speeds and the introduction of high-speed facilities, during the dropping process of cell unit 1, the cell unit frequently experiences issues due to the horizontal conveying speed V. H The collision with the side surface of the material box 4 has caused problems such as damage or breakage of the cell battery 1.

[0009] As mentioned above, when a cell is damaged, the electrodes are exposed, damaging the battery casing. This leads to quality problems such as casing corrosion and electrolyte leakage, reducing product reliability. Furthermore, it can cause short-circuit defects during subsequent folding processes, potentially resulting in accidents such as battery fires or explosions, posing a significant threat to user safety. Therefore, it is necessary to develop a processing and system for manufacturing rechargeable batteries that can address these issues. Summary of the Invention

[0010] Technical issues

[0011] The present invention is designed to solve the above-mentioned problems, and the object of the present invention is to provide a system and method for manufacturing secondary batteries that draws air from the interior of the loading section in a direction opposite to the conveying direction in order to prevent basic units that fall freely at an initial velocity in the conveying direction from colliding with the loading section, thereby reducing folding short-circuit defects that occur in subsequent processing.

[0012] Technical solution

[0013] The system for manufacturing a secondary battery according to the present invention includes: a conveying section configured to convey a basic unit; a loading section into which the basic unit conveyed by the conveying section falls along the direction of gravity, so as to load the basic unit; and an air intake section configured to draw air from the side surface of the loading section into the internal space of the loading section.

[0014] The air intake section can generate an airflow in the internal space of the loading section that is opposite to the direction of transmission.

[0015] In the air intake section, the air intake pressure can gradually decrease from the upper part to the lower part of the loading section.

[0016] The system may further include a pressing portion configured to press the basic unit conveyed by the conveying portion, so that the basic unit falls into the loading portion.

[0017] The conveying section may include a conveyor belt configured to attract the basic unit to the top surface of the basic unit in order to convey the basic unit.

[0018] Multiple conveyor belts may be provided, spaced apart from each other in a direction perpendicular to the conveying direction of the basic unit, and the multiple conveyor belts may together attract a basic unit in order to convey the basic unit.

[0019] The pressing portion can press down from above onto the basic unit exposed between the plurality of conveyor belts, causing the basic unit to fall into the loading portion.

[0020] The loading portion may include: a lower plate for housing the basic unit; a first side plate formed with a surface perpendicular to one edge of the lower plate, the normal vector direction of the surface of the first side plate being parallel to the transport direction; and a second side plate formed at the other edge of the lower plate facing the first side plate, wherein the first side plate may be positioned closer to the transport starting point of the basic unit than the second side plate.

[0021] The air intake section may include a first air intake section disposed in the first side plate to draw air in a direction opposite to the conveying direction of the conveying section.

[0022] The first air intake section can be located at the upper and lower parts of the first side plate.

[0023] The air intake section may further include a second air intake section disposed in the second side plate to draw air in the conveying direction of the conveying section.

[0024] The second air intake section can be located at the upper and lower parts of the second side plate.

[0025] In the air intake section, at the upper part of the loading section, the pressure of the first air intake section may be greater than the pressure of the second air intake section, and at the lower part of the loading section, the pressure of the first air intake section may be the same as the pressure of the second air intake section.

[0026] The pressure of the second air intake section can be constant at the upper and lower parts of the second side plate, and the pressure of the first air intake section can decrease from the upper part of the first side plate to a preset point of the first side plate, but from the preset point of the first side plate to the lower part of the first side plate, the pressure of the first air intake section is the same as the pressure of the second air intake section.

[0027] The pressure of the first air intake section can be constant at the upper and lower parts of the first side plate, and the pressure of the second air intake section can increase from the upper part of the second side plate to a preset point of the second side plate, but from the preset point of the second side plate to the lower part of the second side plate, the pressure of the second air intake section can be the same as the pressure of the first air intake section.

[0028] The loading portion may further include a third side plate formed on the edge of the lower plate to connect the first side plate to the second side plate, and a fourth side plate formed on the edge of the lower plate to connect the first side plate to the second side plate and facing the third side plate.

[0029] The method for manufacturing a secondary battery according to the present invention includes: conveying a basic unit through a conveying section; and allowing the basic unit to fall in the direction of gravity in order to load the basic unit into a loading section, wherein loading the basic unit includes: a pressing process to press the basic unit to cause the basic unit to fall into the loading section; and an air intake process to draw air from the interior of the loading section through an air intake section from the side surface of the loading section.

[0030] In the air intake process, the first air intake section can draw air from the interior of the loading section in a direction opposite to the conveying direction, and the second air intake section can draw air in the conveying direction. In the upper part of the loading section, the pressure of the first air intake section can be greater than the pressure of the second air intake section, and in the lower part of the loading section, the pressure of the first air intake section can be the same as the pressure of the second air intake section.

[0031] Beneficial effects

[0032] The system for manufacturing secondary batteries according to the present invention may include: a conveying section for conveying basic units; a loading section, wherein the basic units conveyed by the conveying section fall along the direction of gravity and are loaded into the loading section; and an air intake section for drawing air from the side surface of the loading section into the internal space of the loading section. Thus, air can be drawn from the interior of the loading section in the direction opposite to the conveying direction to prevent the basic units falling freely at their initial velocity in the conveying direction from colliding with the loading section, thereby reducing folding and short-circuit defects that may occur in subsequent processing. Attached Figure Description

[0033] Figure 1 This is a view showing a system for manufacturing secondary batteries according to the prior art.

[0034] Figure 2 This is a view showing a system for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0035] Figure 3 This is a plan view showing the conveying section, loading section, and pressing section of a conveying basic unit in a system for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0036] Figure 4 This is a view showing the intake pressure generated in the intake section of a system for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0037] Figure 5 This is a view showing an air intake portion disposed on the first side plate of the loading portion in a system for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0038] Figure 6 This is a side view showing the first side plate of the loading section in a system for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0039] Figure 7 This is a view showing the intake pressure generated in the intake section of a system for manufacturing a secondary battery according to Embodiment 2 of the present invention. Detailed Implementation

[0040] Preferred embodiments of the invention will now be described with reference to the accompanying drawings to enable those skilled in the art to readily implement the invention. However, the invention may be implemented in several different forms and is not limited to or construed as described below.

[0041] To clearly illustrate the invention, descriptions of known techniques that are irrelevant to the invention description or that might unnecessarily confuse the spirit of the invention will be omitted, and reference numerals are added to components in each drawing throughout this specification. In this case, the same or similar reference numerals are consistently assigned to the same or similar elements throughout the specification.

[0042] Furthermore, the terms or words used in this specification and claims should not be construed as having a general meaning or a dictionary-based meaning, but should be interpreted as having a meaning and concept consistent with the scope of the invention, based on the principle that the inventor can properly define the terms and concepts to best describe the invention.

[0043] Example 1

[0044] Figure 2 This is a view showing a system for manufacturing a secondary battery according to Embodiment 1 of the present invention. Figure 3 This is a plan view showing the conveying section, loading section, and pressing section of a conveying basic unit in a system for manufacturing a secondary battery according to Embodiment 1 of the present invention. Figure 4 This is a view showing the intake pressure generated in the intake section of a system for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0045] refer to Figure 2 The system for manufacturing secondary batteries according to the present invention includes a conveying section 100, a loading section 200, and an air intake section 300. The conveying section 100 conveys a basic unit 10, which falls along the direction of gravity and is then loaded into the loading section 200. The air intake section 300 draws air from the side surface of the loading section 200 into the internal space of the loading section 200.

[0046] The basic unit 10 can be a major component of the electrode assembly and can be in the form of a dual-cell battery with a positive electrode, a separator, a negative electrode, a separator, and a positive electrode stacked in sequence; however, the invention is not limited thereto. The basic unit 10 can refer to various types of batteries with stacked electrodes and separators.

[0047] In the system for manufacturing secondary batteries according to the invention, the air intake portion 300 can draw air from the internal space to reduce the shaking of the basic unit 10 falling into the loading portion 200, thereby preventing the basic unit 10 and the loading portion 200 from colliding with each other and preventing damage to the basic unit 10, thus reducing folding short-circuit defects that may occur in subsequent processing.

[0048] Furthermore, the system for manufacturing secondary batteries according to Embodiment 1 of the present invention may further include a pressing portion 400, which presses the basic unit 10 conveyed by the conveying portion 100 to allow the basic unit 10 to fall into the loading portion 200. The pressing portion 400 may take the form of a push rod that momentarily presses the basic unit 10 toward the lower side where the loading portion 200 is disposed. As described above, according to the present invention, the pressing portion 400 may be further configured to effectively separate the basic unit 10 from the conveying portion 100, which is a high-speed facility, and then allow the basic unit 10 to fall into the loading portion 200 so that the basic unit 10 is loaded inside the loading portion 200 in a vertically aligned state. In addition, a force may be applied in the vertical direction to generate a velocity of the basic unit 10 in the vertical direction, thereby minimizing the horizontal movement distance of the basic unit 10 having a moving velocity in the conveying direction T, thereby minimizing the collision between the basic unit 10 and the loading portion 200.

[0049] The following will describe in detail the specific structure of the conveying section 100, the loading section 200, the air intake section 300, and the pressing section 400.

[0050] First, the conveying section 100 may include a drive roller connected to the motor shaft of a drive motor, a driven roller arranged parallel to the drive roller, and a conveyor belt coupled to the drive roller and the driven roller to perform track operation and convey the basic unit 10. Here, suction holes may be formed in the conveyor belt 110, and the suction holes may be connected to a vacuum pump to suction the top surface of the continuously supplied cut basic unit 10, thereby conveying the basic unit 10 to the loading section 200.

[0051] refer to Figure 3 Multiple conveyor belts 110 are provided, and the multiple conveyor belts 110 are spaced apart from each other in a direction perpendicular to the conveying direction T of the basic unit 10, so that the multiple conveyor belts 110 together attract one basic unit 10 for conveying the basic unit 10. Thus, the basic unit 10 can be conveyed while being stably attracted to the conveyor belts 110 in a horizontal state. Furthermore, since the multiple conveyor belts 110 are arranged to be spaced apart from each other, the pressing portion 400, described later, can easily press the basic unit 10.

[0052] The pressing part 400 can be a push rod with a cam structure, but is not limited to this, and as... Figure 2 and Figure 3 As shown, the pressing portion 400 can be configured to press down on the basic unit 10 exposed between the multiple conveyor belts 110 from above, causing the basic unit 10 to fall into the loading portion 200. As a result, the basic unit 10, which is continuously supplied and conveyed from the conveying portion 100 as a high-speed facility, can be effectively separated for loading into the loading portion 200.

[0053] Based on the above description of the conveying and pressing processes performed on the basic unit 10 by the conveying section 100 and the pressing section 400, the conveyor belt 110 can adsorb and cut the basic unit 10 and convey the basic unit 10 to the loading section 200. The pressing section 400 can press the basic unit 10 from the upper side of the loading section 200 to separate the basic unit 10 adsorbed on the conveyor belt 110 and allow the basic unit 10 to fall, thereby loading the basic unit 10 into the loading section 200.

[0054] Next, refer to Figure 2 and Figure 3 The loading portion 200 may include a lower plate 210 that houses the basic unit 10 and has a square shape corresponding to the shape of the basic unit 10, and a first side plate 221, a second side plate 222, a third side plate 223 and a fourth side plate 224 formed as surfaces perpendicular to the four edges of the lower plate 210.

[0055] The first side plate 221 may be formed as a surface perpendicular to one edge of the lower plate 210, and the normal vector direction of this surface may be parallel to the conveying direction T of the basic unit 10 of the conveying section 100. A second side plate 222 may be formed at the other edge of the lower plate 210 facing the first side plate 221. Here, compared to the second side plate 222, the first side plate 221 may be positioned closer to the conveying starting point of the basic unit 10. As described above, since the loading section 200 according to Embodiment 1 of the present invention includes the first side plate 221 and the second side plate 222, even if the basic unit 10 falls at a horizontal speed in the conveying direction T, the basic unit 10 can be positioned in a state aligned with the loading section 200. Furthermore, an air intake section 300, described later, may be provided in each of the first side plate 221 and the second side plate 222 to stably load the basic unit 10.

[0056] A third side plate 223 may be formed on the edge of the lower plate 210 to connect the first side plate 221 to the second side plate 222, and a fourth side plate may be formed on the edge of the lower plate 210 to connect the first side plate 221 to the second side plate 222 and face the third side plate 223. That is, when viewed from above, in the loading portion 200, the lower plate 210 may be formed at the bottom, and relative to the first side plate 221 formed on one edge of the lower plate 210, the third side plate 223, the second side plate 222, and the fourth side plate 224 may be formed sequentially in a clockwise direction. As described above, since the four edges of the lower plate 210 on which the basic unit 10 is disposed are formed to be surrounded by four side plates, the basic unit 10 can be stably loaded in an aligned state, and the loaded basic unit 10 can be protected from externally introduced substances and external impacts.

[0057] Next, we will refer to Figures 2 to 6 The air intake section of the present invention will be described in detail below. First, refer to… Figure 2 According to Embodiment 1 of the present invention, the air intake section 300 can generate an airflow in the internal space of the loading section 200 that is opposite to the conveying direction T. In addition to the velocity in the direction of gravity, the basic unit 10, which separates from and falls from the conveying section 100, also has an initial velocity in the horizontal direction, which is the conveying direction T. In particular, in high-speed facilities, even after separation from the conveying section 100, the basic unit 10 may still collide more violently with the loading section 200 (e.g., a container) due to its high-speed horizontal initial velocity. Therefore, the present invention can include the air intake section 300, which can generate an airflow in the internal space of the loading section 200 that is opposite to the conveying direction T, in order to reduce the initial velocity of the falling basic unit 10 in the conveying direction T, thereby preventing the basic unit 10 from colliding with and being damaged by the loading section 200.

[0058] Furthermore, in the intake section 300, the intake pressure gradually decreases from the upper part to the lower part of the loading section 200. Here, the intake pressure P300 of the intake section 300 refers to... Figure 4 The net pressure generated inside the loading section 200 is opposite to the conveying direction T. At the upper part of the loading section 200, there is a large initial velocity in the horizontal direction, and the intake pressure P300 formed inside the loading section 200 by the intake section 300 is large, thereby reducing the initial velocity of the basic unit 10 in the horizontal direction. Subsequently, as the basic unit 10 moves downward, that is, as the basic unit 10 falls while being subjected to a force in the opposite direction to the conveying direction T due to the intake pressure, the initial velocity in the horizontal direction can gradually decrease, thereby gradually reducing the intake pressure P300 downward. At the point where the initial velocities in the horizontal direction are completely canceled out when the basic unit 10 falls, the intake pressure P300 inside the loading section 200 can be zero. As a result, the basic unit 10 can be placed on the lower plate 210 or on previously stacked basic units 10 without colliding with the first side plate 221 or the second side plate 222 of the loading section 200 inside the loading section 200.

[0059] Figure 5 This is a view showing an air intake portion disposed on the first side plate of the loading portion in a system for manufacturing a secondary battery according to Embodiment 1 of the present invention. Figure 6 This is a plan view showing the first side plate of the loading section in a system for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0060] like Figure 4 , Figure 5 and Figure 6 As shown, the air intake section 300 may include a first air intake section 310 disposed in the first side plate 221 to draw air in a direction opposite to the conveying direction of the conveying section 100. The first air intake section 310 may include a vacuum pump and a hose connecting the vacuum pump to the first side plate 221. Furthermore, an air inlet 221a may be formed in the first side plate 221, and a hose may be connected to the air inlet 221a of the first side plate 221 in the first air intake section 310 to generate an air intake pressure P310 inside the loading section 200 through the first air intake section 310. As a result, the initial velocity of the basic unit 10 in the horizontal direction can be reduced, thereby preventing the basic unit 10 from colliding with the loading section 200.

[0061] The first air intake section 310 can generate air intake pressure P310 only at the upper part of the first side plate 221, but multiple air intake holes 221a can be formed at the upper and lower parts of the first side plate 221, and multiple hoses can be connected to these air intake holes 221a respectively, thus being arranged at the upper and lower parts of the first side plate 221. Therefore, the air intake pressure P310 can be continuously supplied until the initial horizontal velocity of the falling basic unit 10 becomes zero, thereby effectively preventing the basic unit 10 from colliding.

[0062] As an example, such as Figure 5 and Figure 6 As shown, eight air inlets 221a can be formed in the first side plate 221, preferably in a four-row, two-column configuration. Here, the distance d2 between the rows can be at least 30 mm in order to minimize the interference caused by the intake pressure generated in the air inlets 221a and the occurrence of eddies in the loading section 200.

[0063] Furthermore, the position of the air intake 221a can be varied according to the length of the long side of the basic unit 10, and the air intake 221a can be formed at a position moved a predetermined distance d1 from the shoulder of the basic unit 10 toward the center of the basic unit 10, based on the basic unit 10 inserted into the loading portion 200. Here, the shoulder of the basic unit 10 can refer to the end of the main body of the basic unit 10, excluding the portion of the tab extending out of the basic unit 10. When the predetermined distance d1 is too short, the intake pressure and airflow will not be sufficiently transmitted to the basic unit 10; when the predetermined distance d1 is too long, a collision with the loading portion 200 may occur at the shoulder of the basic unit 10. Therefore, the predetermined distance d1 can be designed to be an appropriate distance so that the intake pressure and airflow are sufficiently transmitted to the basic unit 10, and the shoulder will not collide with the loading portion 200. Preferably, the predetermined distance d1 can be 19 mm to 21 mm. The total intake pressure generated in the first intake portion 310 can be a minimum of 100 bar and a maximum of 500 bar.

[0064] The intake section 300 may only include the first intake section 310 as described above, however... Figure 2 As shown, the air intake section 300 may further include a second air intake section 320 disposed on the second side plate 222 to draw air along the conveying direction of the conveying section 100. Except that the second air intake section 320 generates an intake pressure P320 in a different air suction direction, the construction of the vacuum pump and hose of the second air intake section 320, as well as the air intake port formed in the second side plate 222, can be understood to be the same as the construction of the first air intake section 310 and the first side plate 221. Furthermore, the second air intake section 320 may also be disposed on the upper and lower parts of the second side plate 222, and as shown... Figure 5As shown, a plurality of air inlets 222a can be formed in the second side plate 222. As described above, in the system for manufacturing a secondary battery according to Embodiment 1 of the present invention, when the air inlet portion 300 further includes a second air inlet portion 320, the air inlet pressures P310 and P320 generated on the two surfaces of the loading portion 200 can be balanced, thereby preventing the generation of eddies inside the loading portion 200. As a result, the shaking of the basic unit 10 during drop can be reduced, and the basic unit 10 can be stacked in a more aligned state.

[0065] When the intake section 300 includes both the first intake section 310 and the second intake section 320, refer to Figure 4 The pressures P310 and P320 of the first air intake section 310 and the second air intake section 320 are such that, in the upper part of the loading section 200, the pressure P310 of the first air intake section can be greater than the pressure P320 of the second air intake section, and in the lower part of the loading section 200, the pressure P310 of the first air intake section can be the same as the pressure P320 of the second air intake section. As a result, the air intake section 300 can generate a net pressure P300 in the upper part of the loading section 200 that is opposite to the conveying direction T, and in the lower part, which completely cancels out the initial horizontal velocity of the basic unit 10 in the conveying direction T, the pressures P310 and P320 generated by the first air intake section 310 and the second air intake section 320 can be balanced, thereby placing the basic unit 10 in the center without colliding with the side plate of the loading section 200.

[0066] In the system for manufacturing a secondary battery according to Embodiment 1 of the present invention, the pressure P320 of the second air intake portion can be constant at the upper and lower parts of the second side plate 222, and the pressure P310 of the first air intake portion can decrease from the upper part of the first side plate 221 to a preset point of the first side plate 221, but from the preset point of the first side plate 221 to the lower part of the first side plate 221, the pressure P310 of the first air intake portion can be the same as the pressure P320 of the second air intake portion. That is, at the upper part of the first side plate 221, the pressure P310 of the first air intake portion can be greater than the pressure P320 of the second air intake portion, and then the pressure P310 of the first air intake portion can gradually decrease towards the lower part of the first side plate 221, but from the preset point, the pressure P310 of the first air intake portion can be the same as the pressure P320 of the second air intake portion. In other words, in the loading portion 200, the air intake pressure P310 of the first air intake portion is equal to or greater than the air intake pressure P320 of the second air intake portion. Here, the preset point can refer to the point where the initial velocity of the basic unit 10 in the horizontal direction is completely offset by the intake pressure P300 of the intake section. Compared with Embodiment 2 described later, even using a device with relatively low output, the required net pressure inside the loading section 200 can be generated, thereby achieving the effect of preventing the basic unit 10 from colliding with the loading section 200.

[0067] Example 2

[0068] Figure 7 This is a view showing the intake pressure generated in the intake section of a system for manufacturing a secondary battery according to Embodiment 2 of the present invention.

[0069] The difference between Embodiment 2 and Embodiment 1 is that the pressure P310 of the first intake section is constant, while the pressure P320 of the second intake section varies depending on its position. Content that overlaps with Embodiment 1 will be omitted as much as possible here, and the focus will be on describing the differences in Embodiment 2. That is, anything not described in Embodiment 2 can obviously be considered as part of Embodiment 1.

[0070] Reference Figure 7In the system for manufacturing a secondary battery according to Embodiment 2 of the present invention, the pressure P310 of the first air intake portion can be constant at the upper and lower parts of the first side plate 221, and the pressure P320 of the second air intake portion can increase from the upper part of the second side plate 222 to a preset point of the second side plate 222. However, from the preset point of the second side plate 222 to the lower part of the second side plate 222, the pressure P320 of the second air intake portion can be the same as the pressure P310 of the first air intake portion. That is, at the upper part of the second side plate 222, the pressure P320 of the second air intake portion can be less than the pressure P310 of the first air intake portion. Then, the pressure P320 of the second air intake portion can gradually increase towards the lower part of the second side plate 222, but from the preset point, the pressure P320 of the second air intake portion can be the same as the pressure P310 of the first air intake portion. Here, the preset point can be understood as being the same as the preset point in the first embodiment.

[0071] For the system for manufacturing a secondary battery according to Embodiment 2 of the present invention, similar to Embodiment 1, an intake pressure can be generated in the direction opposite to the conveying direction T to prevent the basic unit 10 from colliding with the loading portion 200. Compared with Embodiment 1, after the basic unit 10 is placed inside the loading portion 200, a stronger airflow can be generated from the upper part to the lower part of the loading portion 200 to minimize the horizontal movement distance caused by the speed of the basic unit 10 in the conveying direction T.

[0072] Example 3

[0073] The difference between Embodiment 3 of the present invention and Embodiments 1 and 2 is that Embodiment 3 relates to a method for manufacturing a secondary battery using a system for manufacturing a secondary battery according to each of Embodiments 1 and 2. Content that is repeated in Embodiments 1 and 2 will be omitted here as much as possible, and Embodiment 3 will be described with emphasis on the differences. That is, anything not described in Embodiment 3 can obviously be regarded as part of Embodiments 1 and 2 at discretion.

[0074] According to Embodiment 3 of the present invention, a method for manufacturing a secondary battery includes: a process of conveying a basic unit 10 through a conveying section 100, and a process of loading the basic unit 10 into a loading section 200 by allowing the basic unit 10 to fall along the direction of gravity.

[0075] The loading process includes: a pressing process to cause the base unit 10 to fall into the loading section 200, and an air intake process to draw air from the side surface of the loading section 200 through the air intake section 300. In particular, during the air intake process, air is drawn from the interior of the loading section 200 in a direction opposite to the conveying direction T to prevent the base unit 10, which falls freely at an initial velocity in the conveying direction, from colliding with the loading section 200 inside, thereby reducing folding and short-circuit defects that may occur in subsequent processing.

[0076] In the air intake process, the first air intake section 310 can draw air from inside the loading section 200 in a direction opposite to the conveying direction T, and the second air intake section 320 can draw air in the conveying direction. Here, in the upper part of the loading section 200, the pressure P310 of the first air intake section can be greater than the pressure P320 of the second air intake section, and in the lower part of the loading section 200, the pressure P310 of the first air intake section can be the same as the pressure P320 of the second air intake section. As a result, a net pressure can be generated in the upper part of the loading section 200 in a direction opposite to the conveying direction T, and in the lower part, where the initial horizontal velocity of the basic unit 10 in the conveying direction T is completely offset, the pressures P310 and P320 generated by the first air intake section 310 and the second air intake section 320 can be balanced, thereby placing the basic unit 10 in the center without colliding with the side plate of the loading section 200.

[0077] Although embodiments of the invention have been described with reference to specific examples, it will be apparent to those skilled in the art that various changes and modifications are possible without departing from the spirit and scope of the invention as defined in the appended claims.

[0078] [Symbol Description]

[0079] 10: Basic Unit

[0080] 100: Teleportation Section

[0081] 110: Conveyor Belt

[0082] 200: Loading section

[0083] 210: Lower board

[0084] 221: First side plate

[0085] 221a: Air intake port

[0086] 222: Second side panel

[0087] 223: Third side panel

[0088] 224: Fourth side panel

[0089] 300: Intake section

[0090] 310: First air intake section

[0091] 320: Second air intake section

[0092] 400: Pressing part

[0093] T: Direction of travel

[0094] P300: Intake pressure of the intake section

[0095] P310: Intake pressure of the first intake section

[0096] P320: Intake pressure of the second intake section

Claims

1. A system for manufacturing a secondary battery, the system comprising: The transmission section is configured to transmit basic units along the transmission direction; In the loading section, the basic unit conveyed by the conveying section falls into the loading section along the direction of gravity, thereby loading the basic unit; as well as The air intake section is configured to draw air from the side surface of the loading section into the interior space of the loading section, thereby generating an airflow in the interior space of the loading section that is opposite to the conveying direction.

2. The system as claimed in claim 1, wherein, In the air intake section, the air intake pressure gradually decreases from the upper part of the loading section toward the lower part.

3. The system as described in claim 1, wherein, The system further includes a pressing portion configured to press the basic unit conveyed by the conveying portion to cause the basic unit to fall into the loading portion.

4. The system as described in claim 3, wherein, The conveying section includes a conveyor belt configured to attract the basic unit to the top surface of the basic unit in order to convey the basic unit.

5. The system as described in claim 4, wherein, The conveyor belts are arranged in multiple configurations, and the multiple conveyor belts are spaced apart from each other in a direction perpendicular to the conveying direction of the basic unit. Multiple conveyor belts are used together to attract a basic unit in order to transport the basic unit.

6. The system of claim 5, wherein, The pressing portion presses down from above onto the basic unit exposed between the plurality of conveyor belts, causing the basic unit to fall into the loading portion.

7. The system as claimed in claim 1, wherein, The loading section includes: The lower plate on which the basic unit is placed; A first side plate is formed with a surface perpendicular to one edge of the lower plate, the normal vector direction of the surface of the first side plate being parallel to the conveying direction; and A second side plate is formed on the other edge of the lower plate, facing the first side plate. Compared to the second side plate, the first side plate is positioned closer to the transmission starting point of the basic unit.

8. The system of claim 7, wherein, The air intake section includes a first air intake section disposed in the first side plate, which draws air in a direction opposite to the conveying direction of the conveying section.

9. The system of claim 8, wherein, The first air intake section is located at the upper and lower parts of the first side plate.

10. The system of claim 8, wherein, The air intake section further includes a second air intake section disposed in the second side plate to draw air in the conveying direction of the conveying section.

11. The system of claim 10, wherein, The second air intake section is located at the upper and lower parts of the second side plate.

12. The system of claim 11, wherein, In the air intake section, at the upper part of the loading section, the pressure of the first air intake section is greater than the pressure of the second air intake section. At the lower part of the loading section, the pressure of the first air intake section is the same as the pressure of the second air intake section.

13. The system of claim 12, wherein, The pressure in the second air intake section is constant in the upper and lower parts of the second side plate. The pressure of the first air intake section decreases from the upper part of the first side plate to a preset point of the first side plate, but from the preset point of the first side plate to the lower part of the first side plate, the pressure of the first air intake section is the same as the pressure of the second air intake section.

14. The system of claim 12, wherein, The pressure in the first air intake section is constant at the upper and lower parts of the first side plate. The pressure of the second air intake section increases from the upper part of the second side plate to the preset point of the second side plate, but from the preset point of the second side plate to the lower part of the second side plate, the pressure of the second air intake section is the same as the pressure of the first air intake section.

15. The system of claim 7, wherein, The loading section further includes: A third side plate formed at the edge of the lower plate to connect the first side plate to the second side plate; and A fourth side plate is formed at the edge of the lower plate to connect the first side plate to the second side plate and facing the third side plate.

16. A method for manufacturing a secondary battery, the method comprising: The basic unit is transported along the transport direction by the transport section; as well as The basic unit is allowed to fall in the direction of gravity so that it can be loaded into the loading section. Loading the basic unit into the loading section includes: A pressing process that causes the basic unit to fall into the loading section; and An air intake process is performed by drawing air from the side surface of the loading section into the interior space of the loading section, thereby creating an airflow direction opposite to the conveying direction.

17. The method of claim 16, wherein, In the air intake process, the first air intake section draws air from inside the loading section in a direction opposite to the conveying direction, while the second air intake section draws air in the conveying direction. In the upper part of the loading section, the pressure of the first air intake section is greater than the pressure of the second air intake section. At the lower part of the loading section, the pressure of the first air intake section is the same as the pressure of the second air intake section.

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