Cooling unit for secondary battery and secondary battery manufacturing system including the same

Abstract

A cooling unit for a secondary battery according to an embodiment of the disclosure can cool a folded platform portion of a pouch-type secondary battery. The cooling unit for a secondary battery can include a main body, at least a portion of which is bent or folded in a direction surrounding the folded platform portion, and a plurality of jet units provided at an inner surface of the main body and configured to jet gas toward the folded platform portion.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2023-0162772, filed in Korea on November 21, 2023, the disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to a cooling unit for a secondary battery configured as a cooling platform (terrace) portion of a bag-type secondary battery, and a secondary battery manufacturing system including the cooling unit. Background Technology

[0004] Unlike primary batteries, secondary batteries are rechargeable batteries and can be used in a wide range of applications, including digital cameras, mobile phones, laptops, and hybrid electric vehicles. Examples of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-metal hydride batteries, and lithium-ion batteries.

[0005] In the field of secondary batteries, much research is being conducted on lithium secondary batteries with high energy density and discharge voltage. Recently, lithium secondary batteries have been used to form modules by connecting multiple flexible pouched type secondary batteries.

[0006] Because pouch-type secondary batteries use a pouch-shaped battery casing (pouch) as the outer encapsulation covering the electrode assembly, the electrode assembly has a structure in which positive and negative electrode plates, each filled with electrode active material, are stacked and a separator is inserted between the positive and negative electrode plates. A positive electrode tab is formed on one side of the positive electrode plate, and a negative electrode tab is formed on one side of the negative electrode plate. Each tab is connected to an electrode lead for connection to an external circuit. The electrode assembly is sealed by the pouch-type battery casing or outer encapsulation.

[0007] The pouch-type battery housing includes a cup portion for housing electrode assemblies and a platform portion located around the cup portion and configured to seal the electrode assemblies. Additionally, a portion of the platform portion can be folded to increase energy density.

[0008] For example, the platform section can be folded by single-side folding (SSF) or double-side folding (DSF). Folding devices and methods for the platform section are well known (e.g., KR2023-0032886A), and their detailed description is omitted.

[0009] After a predetermined period, the folding platform may experience springback, meaning it no longer remains folded and partially unfolds again. To prevent springback, an adhesive tape bonding process is performed to secure the folding platform using tape or similar materials. However, this tape bonding process increases the complexity of the secondary battery manufacturing process and adds to the required time and cost. Summary of the Invention

[0010] Technical issues

[0011] This disclosure relates to a cooling unit for a secondary battery for preventing the springback of a folding platform portion of a pouch-type secondary battery, and a secondary battery manufacturing system including the secondary battery.

[0012] This disclosure also relates to a cooling unit for rapidly and uniformly cooling a folding platform portion of a secondary battery, and a secondary battery manufacturing system including the cooling unit.

[0013] Technical solution

[0014] A cooling unit for a secondary battery according to embodiments of the present disclosure can cool the folding platform portion of a pouch-type secondary battery. The cooling unit for the secondary battery may include a body, wherein at least a portion of the body is bent or folded in a direction surrounding the folding platform portion; and a plurality of injection units disposed on the inner surface of the body and configured to inject gas toward the folding platform portion.

[0015] Multiple injection units can be configured to inject gases at temperatures below room temperature.

[0016] Multiple injection units can be configured to inject gas at different angles toward the folding platform section.

[0017] Multiple injection units can be configured to inject gas at an angle closer to the horizontal as the injection unit is located closer to the center of the body.

[0018] The main body can extend parallel to the length of the folding platform section, and multiple injection units can be arranged in multiple rows along the length of the folding platform section.

[0019] The main body may include a central portion configured to overlap with the secondary battery in the length or width direction; and a first end portion and a second end portion connected to the central portion and located on opposite sides, wherein the central portion is positioned between the first end portion and the second end portion. The first end portion and the second end portion may be bent or folded in a direction closer to each other.

[0020] The central portion, the first end, and the second end can be bent with the same radius of curvature.

[0021] The plurality of injection units may include a first injection unit configured to inject gas from one side of the folding platform portion in the thickness direction of the secondary battery; and a second injection unit configured to inject gas from the other side of the folding platform portion in the thickness direction of the secondary battery.

[0022] The multiple injection units may further include a third injection unit located between the first injection unit and the second injection unit.

[0023] The main body may have a feed channel inside, and the feed channel may be connected to multiple injection units and configured to feed gas.

[0024] A secondary battery manufacturing system according to embodiments of the present disclosure may include a conveying unit configured to convey pouch-type secondary batteries; and a cooling unit configured to cool a folding platform portion of the secondary batteries. The cooling unit may include a body, wherein at least a portion of the body is bent or folded in a direction surrounding the conveying path of the secondary batteries; and an injection unit disposed on the inner surface of the body and configured to inject gas toward the folding platform portion of the secondary batteries.

[0025] Beneficial effects

[0026] According to an exemplary embodiment of this disclosure, when at least a portion of the body is bent or folded, a plurality of injection units disposed on the inner surface of the body can be configured to inject gas toward the folded platform portion of the secondary battery at different angles. Therefore, the folded platform portion can be cooled to harden it rapidly, consistently, and uniformly, and springback of the folded platform portion can be prevented.

[0027] Furthermore, the effects of this disclosure may include those that can be readily predicted by those skilled in the art from the exemplary embodiments of this disclosure. Attached Figure Description

[0028] The accompanying drawings illustrate exemplary embodiments of the present disclosure and are used, together with the following detailed description, to provide a better understanding of the technical aspects of the present disclosure, and therefore the present disclosure should not be construed as limited to the drawings.

[0029] Figure 1 This is an assembly diagram of a pouch-type secondary battery.

[0030] Figure 2 This is a plan view of a pouch-type secondary battery.

[0031] Figure 3 This is a side view of a pouch-type secondary battery.

[0032] Figure 4 This is a schematic diagram of a cooling unit for a secondary battery according to an embodiment of the present disclosure.

[0033] Figure 5 yes Figure 4 The image shows a front view of the cooling unit used for secondary batteries.

[0034] Figure 6 This is a front view of a cooling unit for a secondary battery according to another embodiment of the present disclosure. Detailed Implementation

[0035] In the following description, exemplary embodiments of the present disclosure will be described in full detail with reference to the accompanying drawings to enable those skilled in the art to readily implement the disclosure. However, the present disclosure may be embodied in many different forms and is not limited to or construed as described in the following embodiments.

[0036] In order to clearly describe this disclosure, irrelevant or detailed descriptions of related known techniques that may unnecessarily obscure the gist of this disclosure have been omitted, and the same or similar reference numerals have been attached to the same or similar elements throughout the specification when reference numerals are attached to elements in each figure.

[0037] Furthermore, the terms or words used in the specification and appended claims should not be construed as limited to their general or dictionary meanings, but should be interpreted based on their meanings and concepts corresponding to the technical aspects of this disclosure, on the basis of allowing the inventors to appropriately define the terms for best interpretation.

[0038] In the accompanying drawings, each element of a secondary battery according to an embodiment of the present disclosure is schematically shown, and for ease of understanding, the dimensions of the elements or the thickness of the wiring may be slightly exaggerated.

[0039] Figure 1 This is an assembly diagram for a pouch-type secondary battery. Figure 2 It is a plan view of a pouch-type secondary battery, and Figure 3 This is a side view of a pouch-type secondary battery.

[0040] The pouch-type secondary battery 1 (hereinafter referred to as 'secondary battery') described herein can be manufactured using the manufacturing equipment and / or methods according to this disclosure. The secondary battery 1 may be in a state at a specific point in the manufacturing process or in a final completed state, and may be appropriately interpreted according to the context or as required.

[0041] The secondary battery 1 may include an electrode assembly 10 and a pouch-type battery casing 20 (hereinafter referred to as 'battery casing').

[0042] The electrode assembly 10 can be formed by stacking positive and negative electrodes alternately with a separator inserted between them. That is, the electrode assembly 10 may include multiple electrodes and separators inserted between the multiple electrodes to insulate them. The electrode assembly 10 may be housed together with the electrolyte solution in the battery housing 20, and more specifically, in the housing portion 22 described below.

[0043] The electrode assembly 10 can be of various types, such as stacked type, jelly roll type, stack-fold type, etc., and the electrode assembly 10 is not limited to a specific type.

[0044] The electrode assembly 10 may include an electrode tab 11. The electrode tab 11 may be connected to each of the positive and negative electrodes of the electrode assembly 10, and may protrude outward from the electrode assembly 10 to serve as a path for the movement of electrons between the interior and exterior of the electrode assembly 10.

[0045] The electrode tab 11 can be formed by cutting the uncoated portion of the electrode current collector or by connecting the conductor to the uncoated portion by ultrasonic welding.

[0046] The electrode contacts 11 may include a positive electrode contact 11a connected to the positive electrode and a negative electrode contact 11b connected to the negative electrode. The positive electrode contact 11a and the negative electrode contact 11b may protrude in different directions in the electrode assembly 10, but the protrusion direction is not limited to this. The positive electrode contact 11a and the negative electrode contact 11b may protrude in various directions, for example, they may protrude from one side in the same direction parallel to each other.

[0047] Electrode leads 12 supplying power to the outside of battery cell 1 can be connected to electrode contacts 11 of electrode assembly 10. Additionally, a portion of the electrode leads 12 can be covered by an insulator 14. The insulator 14 can be sealed using a first housing 20a and a second housing 20b. Therefore, the insulator 14 insulates the electrode leads 12 from the battery housing 20 and maintains the seal of the battery housing 20. The insulator 14 typically includes, but is not limited to, an insulating tape that is easily attached to the electrode leads 12 and has a relatively small thickness, and may include any elements that insulate the electrode leads 12.

[0048] The electrode lead 12 may have one end connected to the electrode contact 11 and another end protruding outward from the battery casing 20. The electrode lead 12 may include a positive electrode lead 12a connected to the positive electrode contact 11a and a negative electrode lead 12b connected to the negative electrode contact 11b.

[0049] Electrode leads 12 can electrically connect electrode assembly 10 to the outside. In addition, since positive electrode contact 11a and negative electrode contact 11b protrude in different directions, positive electrode leads 12a and negative electrode leads 12b can also extend in different directions.

[0050] The battery housing 20 can house the electrode assembly 10 internally and is formed by forming a laminated sheet. For example, when a flexible laminated sheet is drawn using a die and punch, a portion of the laminated sheet can be stretched to form a receiving portion 22 with a pouch-like receiving space, and then the battery housing 20 can be manufactured.

[0051] However, the configuration of the receiving portion 22 is not limited to this, and the receiving portion 22 can be formed in a manner different from the configuration shown. For example, the receiving portion 22 can be formed by folding the laminated sheet into a predetermined shape.

[0052] In the following text, the battery casing 20 may be in a state at a specific point in the manufacturing process, or in a final completed state. That is, the description of the battery casing 20 may include, for example... Figure 2 The sealing condition shown or as Figure 1 The unfolded state is shown and can be interpreted appropriately according to the context or as needed.

[0053] The battery housing 20, which houses the electrode assembly 10, can be sealed so that a portion of the electrode leads 12 is exposed.

[0054] The battery housing 20 may include a first housing 20a and a second housing 20b sealed together, with the electrode assembly 10 positioned between them.

[0055] Preferably, the receiving portion 22 may be formed in at least one of the first housing 20a or the second housing 20b. Additionally, a platform portion 23 may be formed in the area surrounding the receiving portion 22. That is, the battery housing 20 may include the receiving portion 22 and the platform portion 23 located outside the receiving portion 22.

[0056] The first housing 20a and the second housing 20b can be connected to each other via the folding portion 21. However, this disclosure is not limited thereto, and the first housing 20a and the second housing 20b can be manufactured separately.

[0057] The receiving portion 22 may define a receiving space for receiving the electrode assembly 10. The receiving portion 22 may be bag-shaped.

[0058] The following description is based on the receiving portion 22 formed in each of the first housing 20a and the second housing 20b. Those skilled in the art will readily understand that the receiving portion 22 is formed only in either of the pair of housings 20a, 20b.

[0059] The receiving portions 22 of a pair of housings 20a and 20b can be arranged facing each other to accommodate the electrode assembly 10 together. That is, the receiving portions 22 of a pair of housings 20a and 20b can be arranged facing each other to define a receiving space therein for accommodating the electrode assembly 10. In this case, compared with the receiving portion 22 formed in either of the pair of housings 20a and 20b, the electrode assembly 20 can accommodate an electrode assembly 10 with a larger thickness and higher capacity.

[0060] The first housing 20a and the second housing 20b can be connected by a folding portion 21. In the unfolded state of the first housing 20a and the second housing 20b, a portion of the folding portion 21 can be located between the receiving portion 22 of the first housing 20a and the receiving portion 22 of the second housing 20b, and another portion of the folding portion 21 can be located between the platform portion 23 of the first housing 20a and the platform portion 23 of the second housing 20b.

[0061] When the folding portion 21 is folded, the first housing 20a and the second housing 20b can face each other. The folding portion 21 can extend parallel to the length direction of the electrode assembly 10, but is not limited thereto.

[0062] Each housing 20a, 20b may include a platform portion 23 located around the periphery of the receiving portion 22. More specifically, the platform portion 23 may include a first platform portion 24 at the protrusion of the electrode lead 12 and a second platform portion 25 connected to the first platform portion 24.

[0063] As an example, such as Figure 1 As shown, the first platform portion 24 may include a pair of first platform portions 24 located on both sides of the receiving portion 22 in the length direction, and the second platform portion 25 may connect the pair of first platform portions 24 and be located on one side of the receiving portion 22 in the width direction. In this case, the first platform portion 24 may extend in the width direction of the receiving portion 22, and the second platform portion 25 may extend in the length direction of the receiving portion 22.

[0064] As another example, when the first housing 20a and the second housing 20b are separate components not connected to the folding portion 21, the first platform portion 24 may include a pair of first platform portions 24 located on both sides of the receiving portion 22 in the length direction, and the second platform portion 25 may include a pair of second platform portions 25 connected to the pair of first platform portions 24 and located on both sides of the receiving portion 22 in the width direction.

[0065] When the first housing 20a and the second housing 20b are connected by the folding portion 21, either the first platform portion 24 or the second platform portion 25 can be located on the side of the receiving portion 22 opposite to the folding portion 21.

[0066] As an example, such as Figure 1 As shown, the second platform portion 25 can be located on the side of the receiving portion 22 opposite to the folded portion 21. In this case, a pair of first platform portions 24 can connect the folded portion 21 to the second platform portion 25. That is, a pair of electrode leads 12 can extend in opposite directions and protrude outward through each first platform portion 24.

[0067] As another example, the first platform portion 24 may be located on the side of the receiving portion 22 opposite to the folded portion 21. That is, a pair of electrode leads 12 may extend parallel to each other in a direction away from the folded portion 21 and protrude outward through the first platform portion 24. In this case, the second platform portion 25 may include a pair of second platform portions 25 and connect the folded portion 21 to the first platform portion 24.

[0068] As described above, the extension direction and position of the first platform portion 24 and the second platform portion 25 are not limited, and can be formed in other ways as needed.

[0069] When the folding portion 21 is folded, the platform portions 23 of the first housing 20a and the second housing 20b can come into contact with each other. In this case, the insulator 14 of the electrode assembly 10 can be located between the platform portions 23 of the pair of housings 20a and 20b. For example, the insulator 14 can be located between the first platform portions 24 of the pair of housings 20a and 20b.

[0070] The platform portions 23 of the first housing 20a and the second housing 20b can be sealed by bonding in a contact state. The platform portions 23 of the first housing 20a and the second housing 20b can be sealed by bonding polymer layers (e.g., polypropylene), each polymer layer forming the innermost layer.

[0071] More specifically, the first platform portions 24 of the first housing 20a and the second housing 20b can be sealed together, and portions thereof can be sealed with insulator 14. The second platform portions 25 of the first housing 20a and the second housing 20b can be sealed together. After the second platform portions 25 are sealed, some external portions of the second platform portions 25 can be removed by trimming.

[0072] At least a portion of the sealed platform portion 23 can be folded at least once. More specifically, the second platform portion 25 can be folded at least once. The second platform portion 25 can be folded by single-side folding (SSF) or double-side folding (DSF). Preferably, the second platform portion 25 can be folded by double-side folding (DSF), such as... Figure 3 As shown.

[0073] The second platform section 25 can be referred to as the 'folding platform section'.

[0074] The folding platform portion 25 may include a first folding portion 25a and a second folding portion 25b. The first folding portion 25a and the second folding portion 25b may be folding portions of the second platform portion 25.

[0075] The first fold portion 25a can be formed by folding a portion of the second platform portion 25 closer to the receiving portion 22. The second fold portion 25b can be formed by folding a portion of the second platform portion 25 further away from the receiving portion 22. That is, the second fold portion 25b can be formed at a position outside the first fold portion 25a. The folding angle of the second fold portion 25b can be greater than the folding angle of the first fold portion 25a. For example, the second fold portion 25b can be folded at approximately 180 degrees. o Fold, and the first folded portion 25a can be folded at approximately 90 degrees. o fold.

[0076] Additionally, the folding platform portion 25 can be pressed toward the receiving portion 22 to further fold the first folding portion 25a. Therefore, as... Figure 3 As shown, the end of the folding platform portion 25 may contact or be adjacent to the receiving portion 22.

[0077] Figure 4 This is a schematic diagram of a cooling unit for a secondary battery according to an embodiment of the present disclosure, and Figure 5 yes Figure 4 The image shows a front view of the cooling unit used for secondary batteries.

[0078] Over time, the folding platform portion 25 may experience springback, meaning that the platform portion 25 does not remain folded and partially unfolds again. More specifically, when springback occurs, the first folding portion 25a may partially unfold, and the end of the folding platform portion 25 may move away from the receiving portion 22.

[0079] To prevent springback, a secondary battery manufacturing system (hereinafter referred to as the 'manufacturing system') according to embodiments of the present disclosure may include a cooling unit 100 configured to cool the folded platform portion 25 of the secondary battery 1. The cooling unit 100 may cool the folded platform portion 25 to harden it, thereby preventing springback.

[0080] The manufacturing system may include a conveying unit 200 to convey the secondary battery 1. The conveying unit 200 may be configured to convey the secondary battery 1 along a preset conveying path P. The configuration of the conveying unit 200 is not limited. For example, the conveying unit 200 may include a tray on which the secondary battery 1 is mounted, and a shuttle for conveying the tray.

[0081] The manufacturing system may include a folding unit (not shown) to fold the platform portion 25 of the secondary battery 1. The folding unit may form the folded platform portion 25 using heat and pressure. For example, the folding unit may include a plurality of folding blocks configured to move upward or downward in a preset order to fold the platform portion 25, and a pressing block configured to press the folded platform portion 25 toward the receiving portion 22. Additionally, a heater (e.g., a hot wire) may be embedded in at least one of the plurality of folding blocks or pressing blocks to apply heat to the platform portion 25 while in contact with it. The configuration and operation of the folding unit are well known, and their detailed description is omitted.

[0082] The cooling unit 100 can be located further rearward than the folding unit relative to the transmission path P of the secondary battery 1. The cooling unit 100 can quickly cool the folding platform portion 25 to cool the heat applied by the folding unit.

[0083] The cooling unit 100 can be located on one side of the transport path P relative to the secondary battery 1. The cooling unit 100 can be arranged parallel to the transport path P of the secondary battery 1. In this regard, the transport unit 200 can transport the secondary battery 1 such that the folding platform portion 25 remains parallel to the transport path. Therefore, the cooling unit can effectively cool the folding platform portion 25 of the secondary battery 1 as it moves along the transport path P.

[0084] More specifically, the cooling unit 100 may include a main body 110 and a plurality of spray units 120 disposed on the inner surface of the main body 110.

[0085] The main body 110 can extend parallel to the length direction of the folding platform portion 25. The main body 110 can extend parallel to the transmission path P of the secondary battery 1.

[0086] The main body 110 may have an internal feed channel 100a, and the feed channel 100a may be in communication with and configured to feed gas through a plurality of injection units 120 as described below. A gas feed pump (not shown) located outside the cooling unit 100 may be connected to the feed channel 100a. The gas in the feed channel 100a may be injected via each of the plurality of injection units 120.

[0087] At least a portion of the main body 110 may be bent or folded in a direction surrounding the folding platform portion 25. At least a portion of the main body 110 may be bent or folded in a direction surrounding the transport path P of the secondary battery 1.

[0088] Due to the shape of the main body 110, the multiple injection units 120 can be configured to point at different angles. The multiple injection units 120 can be configured to inject gas at different angles toward the folded platform portion 25 of the secondary battery 1. Therefore, the folded platform portion 25 can be cooled quickly, consistently, and uniformly.

[0089] More specifically, the multiple injection units 120 can be configured to inject gas at an angle closer to the horizontal as they are set closer to the center of the body 110. That is, the angle of each injection unit 120 can be blunter as the injection unit 120 is set closer to the center of the body 110.

[0090] The configuration of each injection unit 120 is not limited. For example, each injection unit 120 may include a nozzle.

[0091] The type of gas ejected from each injection unit 120 is not limited. Gas can refer to all types of gas, including air.

[0092] As an example, each injection unit 120 can be configured to inject gas at a temperature below room temperature. For example, each injection unit 120 can inject cold air via a vortex tube or a cold jet method. Therefore, the folding platform section 25 can be cooled more quickly. However, this disclosure is not limited thereto, and each injection unit 120 can be configured to inject gas at room temperature.

[0093] The main body 110 may include a central portion 111 that overlaps with the secondary battery 1, and a first end portion 112 and a second end portion 113 located on opposite sides in the length or width direction of the secondary battery 1, wherein the central portion 111 is positioned between them.

[0094] The first end portion 112 and the second end portion 113 may be connected to the central portion 111. The first end portion 112 and the second end portion 113 may be bent or folded in a direction closer to each other. The first end portion 112 and the second end portion 113 may be integrally formed with the central portion 111, but are not limited thereto.

[0095] In this embodiment, the main body 110 can be bent in the direction surrounding the folding platform portion 25. The main body 110 can also be bent in the direction surrounding the transport path P of the secondary battery 1. Therefore, the gas ejected from the plurality of injection units 120 can be focused onto the folding platform portion 25.

[0096] As an example, such as Figure 4 and Figure 5 As shown, the central portion 111, the first end portion 112, and the second end portion 113 can be bent with the same radius of curvature. Therefore, the gas ejected from the multiple injection units 120 can be further focused onto the folding platform portion 25.

[0097] However, the central portion 111, the first end portion 112, and the second end portion 113 may have different radii of curvature or varying radii of curvature. In addition, the central portion 111 may be formed substantially vertically, and the first end portion 112 and the second end portion 113 may be curved relative to the central portion 111.

[0098] Multiple injection units 120 can be arranged in multiple rows along the length of the folded platform portion 25 of the secondary battery 1. The multiple injection units 120 can be arranged in multiple rows parallel to the conveying path P of the secondary battery 1. For example, as... Figure 4 As shown, multiple injection units 120 can be arranged in three rows.

[0099] Therefore, while the secondary battery 1 is being transported, the multiple injection units 120 can continuously cool the folding platform section 25.

[0100] The plurality of injection units 120 may include a first injection unit 121 for injecting gas from one side of the folding platform portion 25, and an injection unit 121 for injecting gas in the thickness direction of the secondary battery 1. Figure 5 The second injection unit 122 sprays gas from the other side in the vertical direction of the first end 112. The first injection unit 121 may be disposed on the inner surface of the first end 112, and the second injection unit 122 may be disposed on the inner surface of the second end 113.

[0101] The first injection unit 121 and the second injection unit 122 can be arranged symmetrically.

[0102] The plurality of spray units 120 may further include a third spray unit 123 located between the first spray unit 121 and the second spray unit 122. The third spray unit 123 may be disposed in the inner surface of the central portion 111.

[0103] The first injection unit 121 and the second injection unit 122 can be configured such that they point at a predetermined angle relative to the horizontal direction. The angle pointed to by the third injection unit 123 can be blunter than the angle pointed to by the first injection unit 121 and the second injection unit 122. For example, the third injection unit 123 can be configured such that it points to a generally horizontal direction.

[0104] The first spray unit 121 can be directed towards the second folded portion 25b of the folding platform portion 25 or the area adjacent to the second folded portion 25b. The second spray unit 122 can be directed towards the first folded portion 25a of the folding platform portion 25 or the area adjacent to the first folded portion 25a. Therefore, each folded portion 25a, 25b of the folding platform portion 25 can be rapidly and intensively cooled and hardened, thereby reliably preventing springback.

[0105] The third injection unit 123 can be directed towards the area between the first folded portion 25a and the second folded portion 25b of the folding platform portion 25. Therefore, the entire folding platform portion 25 can be cooled and hardened. However, the positions pointed to by each injection unit 121, 122, 123 are not limited to those described above.

[0106] The first injection unit 121, the second injection unit 122, and the third injection unit 123 may each include a plurality of first injection units 121, a plurality of second injection units 122, and a plurality of third injection units 123.

[0107] Each injection unit 121, 122, 123 can be arranged in multiple rows along the length of the folding platform portion 25 of the secondary battery 1. Each injection unit 121, 122, 123 can be arranged in multiple rows parallel to the conveying path P of the secondary battery 1. For example, each injection unit 121, 122, 123 can be arranged in a single row. However, this disclosure is not limited thereto.

[0108] When the first spray units 121 are arranged in multiple rows, the angle of each first spray unit 121 can become more blunt as it is positioned closer to the center of the main body 110. When the second spray units 122 are arranged in multiple rows, the angle of each second spray unit 122 can become more blunt as it is positioned closer to the center of the main body 110. When the third spray units 123 are arranged in multiple rows, the angle of each third spray unit 123 can become more blunt as it is positioned closer to the center of the main body 110.

[0109] Therefore, the folding platform section 25 can be cooled more consistently and uniformly.

[0110] Meanwhile, the cooling unit 100 can be positioned close to the secondary battery 1. More specifically, the cooling unit 100 can be configured such that when the secondary battery 1 passes through the cooling unit, at least a portion of the folding platform portion 25 is located inside the main body 110. That is, at least a portion of the folding platform portion 25 can be located further inward than the imaginary plane connecting the two ends of the main body 110.

[0111] Therefore, the distance between the multiple injection units 120 and the folding platform portion 25 can be smaller, and the cooling efficiency of the folding platform portion 25 can be improved.

[0112] Figure 6 This is a front view of a cooling unit for a secondary battery according to another embodiment of the present disclosure.

[0113] In the following text, any descriptions shared with the foregoing descriptions are omitted, and the differences will be described.

[0114] In this embodiment, the main body 110 can be bent in the direction surrounding the folding platform portion 25. The main body 110 can also be bent in the direction surrounding the transport path P of the secondary battery 1.

[0115] For example, the central portion 111 can be formed substantially vertically, and the first end portion 112 and the second end portion 113 can be bent toward the central portion 111 at a predetermined angle. Here, the predetermined angle can be greater than 90 degrees. o And less than 180 o The obtuse angle.

[0116] When the first spray units 121 are arranged in multiple rows, the angles of each first spray unit 121 can be equal to each other. When the second spray units 122 are arranged in multiple rows, the angles of each second spray unit 122 can be equal to each other. When the third spray units 123 are arranged in multiple rows, the angles of each third spray unit 123 can be equal to each other.

[0117] The foregoing description has been illustrated by way of example to describe the technical aspects of this disclosure, and it will be apparent to those skilled in the art that various modifications and changes can be made without departing from the essential features of this disclosure.

[0118] Therefore, the disclosed embodiments are provided to describe the technical aspects of this disclosure, but are not intended to be limiting, and the technical scope of this disclosure is not limited to these embodiments.

[0119] The scope of protection of this disclosure shall be interpreted by the appended claims, and it should be understood that all technical spirit within the equivalent scope is included within the scope of protection of this disclosure.

[0120] [Reference Number List]

[0121] 1: Pouch-type secondary battery; 25: Second platform section, folding platform section

[0122] 25a: First fold section; 25b: Second fold section

[0123] 100: Cooling unit 100a: Feed channel

[0124] 110: Main body 111: Central part

[0125] 112: First end 113: Second end

[0126] 120: Injection unit; 121: First injection unit

[0127] 122: Second injection unit; 123: Third injection unit

[0128] 200: Transmission Unit

Claims

1. A cooling unit for a folding platform portion of a pouch-type secondary battery, the cooling unit comprising: A main body, wherein at least a portion of the main body is bent or folded in a direction surrounding the folding platform portion; as well as Multiple injection units are disposed on the inner surface of the main body and configured to inject gas toward the folding platform portion.

2. The cooling unit for a secondary battery according to claim 1, in, The plurality of injection units are configured to inject the gas at a temperature below room temperature.

3. The cooling unit for a secondary battery according to claim 1, in, The plurality of injection units are configured to inject the gas toward the folding platform portion at different angles.

4. The cooling unit for a secondary battery according to claim 1, in, The plurality of injection units are configured to inject the gas at an angle closer to the horizontal as the injection unit is located closer to the center of the body.

5. The cooling unit for a secondary battery according to claim 1, in, The main body extends parallel to the length direction of the folding platform portion, and The plurality of injection units are arranged in multiple rows along the length direction of the folding platform portion.

6. The cooling unit for a secondary battery according to claim 1, in, The subject includes: The central portion configured to overlap with the secondary battery in the length or width direction; and A first end and a second end connected to the central portion and located on opposite sides, wherein the central portion is positioned between the first end and the second end, and The first end and the second end are bent or folded in a direction that brings them closer to each other.

7. The cooling unit for a secondary battery according to claim 6, in, The central portion, the first end, and the second end are bent with the same radius of curvature.

8. The cooling unit for a secondary battery according to claim 1, in, The plurality of injection units include: A first injection unit, configured to inject the gas from one side of the folded platform portion in the thickness direction of the secondary battery; and A second injection unit is configured to inject the gas from the other side of the folding platform portion in the thickness direction of the secondary battery.

9. The cooling unit for a secondary battery according to claim 8, in, The plurality of injection units further include: A third injection unit located between the first injection unit and the second injection unit.

10. The cooling unit for a secondary battery according to claim 1, in, The main body has an internal feed channel, which is connected to the plurality of injection units and configured to feed the gas.

11. A secondary battery manufacturing system, comprising: A conveying unit configured to convey bag-type secondary batteries; as well as A cooling unit configured to cool the folded platform portion of the secondary battery. The cooling unit includes: The main body, wherein at least a portion of the main body is bent or folded in the direction of the transport path around the secondary battery; and Multiple injection units are disposed on the inner surface of the main body and configured to inject gas toward the folded platform portion of the secondary battery.

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