Heat treatment apparatus for notch part of vent cap of cylindrical secondary battery

Abstract

A heat treatment apparatus for a notch part of a vent cap of a cylindrical secondary battery according to an embodiment of the present invention relates to a heat treatment apparatus for a notch part of a vent cap of a cylindrical secondary battery in which the notch part is formed by press forming. The heat treatment apparatus comprises: a transfer module that transfers the vent cap of the cylindrical secondary battery in one direction; and a laser heat treatment module that receives the vent cap of the cylindrical secondary battery from the transfer module and then performs localized heat treatment on the notch part, wherein the laser heat treatment module comprises: an inlet through which the cylindrical secondary battery before the heat treatment is introduced; an outlet through which the cylindrical secondary battery after the heat treatment is discharged; and an enclosure having a first through hole formed in the top surface thereof and a second through hole formed in the bottom surface thereof, wherein a first quartz plate and a second quartz plate are respectively arranged in the first through hole and the second through hole.

Description

Heat treatment device for the notch of a cylindrical secondary battery vent cap

[0001] The present invention relates to a heat treatment device for a notch portion of a cylindrical secondary battery vent cap, and more particularly, to a heat treatment device for performing local heat treatment of a notch portion after forming a cylindrical secondary battery vent cap.

[0002] The present invention is derived from research conducted as part of the World Class Plus Project Support (R&D) research project of the Ministry of Trade, Industry and Energy (Project Unique Number: 2023062, Project Number: P0024389, Project Management Agency: Korea Institute for Advancement of Technology, Research Project Name: Development of Cylindrical Secondary Battery Cap Assembly Manufacturing Process and Automated Assembly Equipment, Project Executing Agency: Deokwoo Electronics Co., Ltd., Research Period: 2023.04.01~2026.12.31).

[0003]

[0004] Secondary batteries capable of repeated charging and discharging can be classified into pouch-type, square-type, and cylindrical types depending on their structure. Among these, the battery can forming the body of a cylindrical secondary battery and the top cap attached to the top of the battery can are generally made of metal.

[0005] The top cap of a cylindrical secondary battery is manufactured by forming the basic shape through a pressing process, and then going through a plating process such as nickel to prevent corrosion, and an additional anti-corrosion process to prevent corrosion due to micro-cracks such as pin holes.

[0006] Meanwhile, in the case of secondary batteries, the internal temperature may rise rapidly due to short circuits or overcharging, and such rapid rise in temperature may cause the secondary battery to catch fire or explode.

[0007] In order to prevent ignition and explosion of secondary batteries, according to the prior art, the top cap is formed as a vent cap by welding a CID (current interrupt device) and a vent to provide the (+) terminal role and safety, and when the pressure inside the battery cell increases, the welding part of the CID is short-circuited first to cut off the current, and under higher pressure, the vent notch part is eventually ruptured to discharge the gas inside the secondary battery to the outside and lower the pressure. In addition, a top cap configuration using only a vent without the CID configuration is also possible.

[0008] However, in the case of vent caps using this welding method, the manufacturing time is long and it is difficult to ensure uniform quality, so there are cases where the vent cap does not break properly even under high pressure inside the battery cell, and thus the safety of cylindrical secondary batteries is not guaranteed when the temperature rises rapidly.

[0009] In order to overcome the problems of the above-described welding method vent cap, a technology has been proposed in which a concentric notch (11) is formed in the vent cap (10) at a preset distance from the center, as shown in FIGS. 1 to 3, so that when the pressure inside the battery cell increases, the notch (11) breaks, cutting off the current and releasing the gas to lower the pressure.

[0010] In the case of this notch-type vent cap (10), a notch (11) is formed through press forming processing, and the notch (11) may be hardened due to plastic deformation, which may cause non-breakage at the target pressure.

[0011] In order to solve this problem, heat treatment (annealing) is performed on the area to soften the notch (11). However, when a vent cap formed of stainless steel is heat treated, Cr2O3 is generated due to surface oxidation during the heat treatment process, which causes yellowing (discoloration), and there is a problem in that surface hardening is strengthened.

[0012]

[0013] The notch heat treatment device of a cylindrical secondary battery vent cap according to one embodiment of the present invention aims to solve the above-described problems by achieving the following solutions.

[0014] The present invention provides a heat treatment device for a notch portion of a cylindrical secondary battery vent cap that can prevent yellowing of the vent cap due to heat treatment and simultaneously prevent rupture at a target pressure.

[0015] The problems solved by the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by a person having ordinary knowledge in the relevant technical field from the description below.

[0016]

[0017] A heat treatment device for a notch portion of a cylindrical secondary battery vent cap according to one embodiment of the present invention relates to a heat treatment device for a notch portion of a cylindrical secondary battery vent cap having a notch portion formed by press molding, comprising: a transport module for transporting the cylindrical secondary battery vent cap in one direction; a laser heat treatment module for receiving the cylindrical secondary battery vent cap from the transport module and performing local heat treatment on the notch portion; wherein the laser heat treatment module includes an enclosure having an inlet for introducing a cylindrical secondary battery before heat treatment, an outlet for discharging a cylindrical secondary battery after heat treatment, a first through-hole disposed on an upper surface, and a second through-hole disposed on a lower surface, wherein a first quartz plate and a second quartz plate are respectively disposed in the first through-hole and the second through-hole.

[0018] It is preferable that the laser heat treatment module further includes a first laser irradiation unit that is positioned on the upper portion of the enclosure and irradiates a laser to the upper portion of the notch portion of the cylindrical secondary battery vent cap through the first through hole; and a gas injection unit that injects at least one of an inert gas and a hydrogen mixed gas into the enclosure.

[0019] It is preferable that the above laser heat treatment module further include a temperature measurement unit that is placed at the bottom of the enclosure and measures the temperature of the lower side of the cylindrical secondary battery vent cap.

[0020] It is preferable to further include an optical filter arranged on top of the temperature measurement unit and blocking light of a wavelength corresponding to the spectrum of a laser beam irradiated from the first laser irradiation unit.

[0021] It is preferable that the above temperature measurement unit be a thermal imaging camera or an infrared sensor.

[0022] It is preferable that the laser heat treatment module further includes a second laser irradiation unit that is positioned at the lower portion of the enclosure and irradiates a laser to the lower portion of the notch portion of the cylindrical secondary battery vent cap through the second through hole.

[0023] It is preferable to further include a control module for controlling the laser heat treatment module; and an inspection module for performing inspection after receiving a cylindrical secondary battery vent cap whose notch has undergone heat treatment by the transport module.

[0024] The control module preferably includes a transport module control unit that controls the operation of the transport module; a laser output control unit that controls the output of at least one of the first laser irradiation unit and the second laser irradiation unit; a gas injection amount control unit that controls the amount of gas injected by the gas injection unit; a storage unit that collects and stores big data on the results of the inspection module according to the laser output of the first laser irradiation unit, the laser output of the second laser irradiation unit, and the amount of gas injected by the gas injection unit; a learning unit that performs machine learning based on the data stored in the storage unit; and an optimal condition calculation unit that generates an optimal output condition of the laser irradiated to the notch portion and an optimal gas injection amount based on an algorithm determined by the learning unit.

[0025] The above algorithm is a deep learning algorithm in which a correlation between input factors and output factors is defined, and the input factors are at least one of the output power of the laser irradiated from the first laser irradiation unit and the second laser irradiation unit, the output time of the laser, the irradiation path of the laser, the type of gas injected by the gas injection unit, the amount of gas injected, and the cycle of gas injection, and the output factors are at least one of the degree of discoloration of the notch portion and the breaking pressure of the notch portion.

[0026]

[0027] A heat treatment device for a notch portion of a cylindrical secondary battery vent cap according to one embodiment of the present invention is configured to perform heat treatment only on the notch portion of the vent cap, which is a locally hardened portion, using a laser, thereby reducing carbon emissions and reducing process costs.

[0028] In addition, the heat treatment process of the notch part can be established on the assembly line, which can be expected to result in easier management and operation.

[0029] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary knowledge in the relevant technical field from the description below.

[0030]

[0031] Figure 1 is a front view of a cylindrical secondary battery vent cap.

[0032] Figure 2 is a cross-sectional view of AA` of Figure 1.

[0033] Figure 3 is a detailed drawing of the 'X' portion of Figure 2.

[0034] Figure 4 is a graph showing the breaking pressure of a notch according to laser output when a laser is locally irradiated on the notch.

[0035] Figure 5 is a schematic diagram of a notch heat treatment device for a cylindrical secondary battery vent cap according to the first embodiment of the present invention.

[0036] Figures 6 and 7 are schematic diagrams of a notch heat treatment device of a cylindrical secondary battery vent cap according to a second embodiment of the present invention.

[0037] Figure 8 is a block diagram showing the detailed configuration of a control module in a notch heat treatment device of a cylindrical secondary battery vent cap according to the present invention.

[0038] Figure 9 is a block diagram showing the detailed configuration of an inspection module among the notch heat treatment devices of a cylindrical secondary battery vent cap according to the present invention.

[0039]

[0040] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be given the same reference numbers and redundant descriptions thereof will be omitted.

[0041] Furthermore, when describing the present invention, detailed descriptions of related known technologies will be omitted if they are deemed to obscure the gist of the present invention. Furthermore, it should be noted that the attached drawings are intended solely to facilitate understanding of the spirit of the present invention and should not be construed as limiting the spirit of the present invention.

[0042]

[0043] Hereinafter, a notch heat treatment device of a cylindrical secondary battery vent cap according to the present invention will be described with reference to FIGS. 1 to 9.

[0044] The present invention relates to a heat treatment device for a notch portion (11) of a cylindrical secondary battery vent cap (10) manufactured by forming a notch portion by press forming on a stainless steel plate, and the cylindrical secondary battery vent cap (10) is formed in a circular shape to be placed on the upper portion of a cylindrical battery can as illustrated in FIGS. 1 to 3.

[0045] The secondary battery vent cap (10) is formed with concentric notches (11) spaced apart from the center by a preset distance, so that when the pressure inside the battery cell increases, the notches are ruptured by the pressure, thereby preventing an explosion of the battery cell by releasing the gas inside the secondary battery to the outside.

[0046] Meanwhile, the notch portion (11) is formed by press forming processing, and as a result, the notch portion (11) is hardened and may not break at the target pressure. Taking this into consideration, it is necessary to soften the notch portion (11) through heat treatment.

[0047] To this end, the notch heat treatment device of the cylindrical secondary battery vent cap according to the present invention is configured to perform heat treatment only on the notch portion (11), which is a locally hardened portion, using a laser.

[0048] Referring to Figure 4, if we check the change in fracture pressure according to the laser power or heat treatment temperature, the fracture pressure is 25 kgf / cm before laser heat treatment. 2 However, it was confirmed that the breaking pressure gradually decreased when heat treatment was performed on the notch portion (11) using a laser.

[0049] However, softening of the notch portion (11) is achieved through heat treatment in a temperature range of approximately 720°C or lower, but when this is exceeded, martensite is generated and it has been confirmed that the strength of the notch portion (11) actually increases. Therefore, an optimal laser output setting is required.

[0050] In order to implement the above-described function, the notch heat treatment device of the cylindrical secondary battery vent cap according to the present invention is configured to include a transport module (100), a laser heat treatment module (200), and a control module (300) as shown in FIGS. 5 to 7.

[0051] The transport module (100) performs the function of transporting the cylindrical secondary battery vent cap (10) in one direction, and it is preferable that a plurality of fixing portions (110) be formed on the transport module (100) so that the secondary battery vent cap (10) can be fixedly installed.

[0052] The laser heat treatment module (200) receives a cylindrical secondary battery vent cap (10) from the transfer module (100) and then performs local heat treatment on the notch portion (11). This laser heat treatment module (200) can be configured in various ways.

[0053] First, the laser heat treatment module (200) can be configured to include an enclosure (210), a first laser irradiation unit (221), a gas injection unit (230), a quartz plate (241, 242), and a temperature measurement unit (260) as shown in FIG. 5.

[0054] The enclosure (210) is configured to isolate the heat treatment area where laser heat treatment is performed from other areas, and an inlet (211) and an outlet (212) are formed on one side and the other side, so that a cylindrical secondary battery vent cap (10) before heat treatment is introduced into the heat treatment area through the inlet (211), and then, when laser heat treatment is completed, moves out of the heat treatment area through the outlet (212).

[0055] The first laser irradiation unit (221) performs the function of irradiating a laser (20) to the upper side of the notch portion (11) of the cylindrical secondary battery vent cap (10), and softens the notch portion (11) by the irradiated laser (20).

[0056] Meanwhile, in the process of performing local heat treatment on the notch portion (11) by the first laser irradiation unit (220), Cr2O3 is generated due to surface oxidation of the notch portion (11), which causes discoloration due to yellowing to appear on the notch portion (11), and further, there is a problem that surface hardening is strengthened.

[0057] To solve the above-mentioned problem, a method of suppressing the production of Cr2O3 by creating a reducing atmosphere through hydrogen heat treatment can be considered, but this requires thorough management due to the explosive nature of hydrogen, and has the disadvantage of high production costs due to high-temperature furnace operation.

[0058] Therefore, in order to suppress the generation of Cr2O3 by laser heat treatment, it is necessary to use an inert gas such as Ar gas and a mixed gas of hydrogen, and stability can be secured, especially when hydrogen is excluded.

[0059] That is, the gas injection unit (230) performs the function of injecting Ar, N, Ar / H2, N / H2 inert gas and hydrogen mixed gas into the enclosure (210) to suppress the production of the above-described Cr2O3.

[0060] Meanwhile, the first laser irradiation unit (221) is placed on the upper part of the enclosure (210) as shown in FIGS. 5 to 7, and a first through-hole (213) is formed in an area corresponding to the laser irradiation unit (220) on the upper surface of the enclosure (210) so that the laser (20) output from the laser irradiation unit (220) can be irradiated to the upper surface of the cylindrical secondary battery vent cap (10).

[0061] In addition, the notch heat treatment device of the cylindrical secondary battery vent cap according to the first embodiment of the present invention may be configured to further include a temperature measurement unit (260) as illustrated in FIG. 5.

[0062] This temperature measurement unit (260) is placed at the bottom of the enclosure (210) and performs the function of measuring the temperature of the lower side of the cylindrical secondary battery vent cap (10), and the output status of the first laser irradiation unit (221) can be checked with reference to the temperature obtained by the temperature measurement unit (260).

[0063] In addition, a thermal imaging camera or an infrared sensor can be applied as the temperature measurement unit (260), and a second through hole (214) is formed on the lower surface of the enclosure (210) so that the temperature of the cylindrical secondary battery vent cap (10) can be measured by the temperature measurement unit (260).

[0064] At this time, in order to suppress the generation of Cr2O3 by laser heat treatment, it is necessary to prevent the gas injected into the enclosure (210) from leaking to the outside through the first through-hole (213) and the second through-hole (214) as much as possible, and it is therefore preferable to minimize the outflow of gas through the first through-hole (213) and the second through-hole (214) by arranging a first quartz plate (241) and a second quartz plate (242) in the first through-hole (213) and the second through-hole (214), respectively.

[0065] Meanwhile, when the cylindrical secondary battery vent cap (10) is penetrated by the laser (20) irradiated from the first laser irradiation unit (221) or the cylindrical secondary battery vent cap (10) is not seated in the seating portion (110) of the transport module (100), when the laser (20) is irradiated from the first laser irradiation unit (221), the laser (20) may pass through the second penetration portion (214) and be irradiated to the temperature measurement unit (260), which may cause the temperature measurement unit (260) to be damaged.

[0066] To prevent such problems, the heat treatment device for a cylindrical secondary battery vent cap according to the first embodiment of the present invention may be configured to further include an optical filter (270) as illustrated in FIG. 5.

[0067] This optical filter (270) is configured to be placed above the temperature measurement unit (260), and is preferably configured to block light of a wavelength corresponding to the spectrum of a laser beam irradiated from the first laser irradiation unit (221).

[0068] In addition, the optical filter (270) may be provided separately from the second quartz plate (242) as illustrated in FIG. 5, but the configuration mounted on the second through-hole (214) may be replaced with the optical filter (270) instead of the second quartz plate (242), and further, it may be possible to attach a separate film to the second quartz plate (242) to block light of a wavelength corresponding to the spectrum of the laser beam (20).

[0069]

[0070] A heat treatment device for a cylindrical secondary battery vent cap according to a second embodiment of the present invention is an embodiment in which a second laser irradiation unit (222) is additionally configured in a laser heat treatment module (200) as shown in FIGS. 6 and 7.

[0071] In particular, the second laser irradiation unit (222) is arranged at the bottom of the enclosure (210) and performs the function of irradiating a laser to the lower side of the notch (11) of the cylindrical secondary battery vent cap (10) through the second through hole (214), thereby enabling laser heat treatment to be performed simultaneously on the upper and lower parts of the cylindrical secondary battery vent cap (10).

[0072] In consideration of the fact that, similar to the heat treatment device for the notch portion of the cylindrical secondary battery vent cap according to the first embodiment of the present invention described above, it is necessary to prevent gas injected into the interior of the enclosure (210) from leaking to the outside through the first through-hole (213) and the second through-hole (214) as much as possible, it is preferable to minimize the leakage of gas through the first through-hole (213) and the second through-hole (214) by arranging a first quartz plate (241) and a second quartz plate (242) in the first through-hole (213) and the second through-hole (214), respectively.

[0073] In addition, it is desirable to minimize the inlet (211) and outlet (212) of the enclosure (210) by forming them to a minimum extent that movement of the secondary battery vent cap (10) by the transport module (100) is possible, thereby minimizing the leakage of gas injected into the enclosure (210) to the outside through the inlet (211) and outlet (212).

[0074] Furthermore, as illustrated in FIG. 7, the enclosure (210) is configured to further include a gas injection unit (250) that injects gas toward the inlet (211) and the outlet (212), and a gas curtain (30) can be formed on the inlet (211) and the outlet (212) sides by the gas injected from the gas injection unit (250), thereby minimizing the gas inside the enclosure (210) from leaking to the outside through the inlet (211) or the outlet (212).

[0075] At this time, it is preferable that the gas injected from the gas injection unit (250) is at least one of Ar, N, Ar / H2, N / H2 inert gas and hydrogen mixed gas injected by the gas injection unit (230), and this technical feature can be applied as is to the notch heat treatment device of the cylindrical secondary battery vent cap according to the first embodiment of the present invention.

[0076] The control module (300) performs a function of controlling the laser heat treatment module (200), and the inspection module (400) is configured to perform an inspection after receiving a cylindrical secondary battery vent cap (10) in which heat treatment of the notch portion (11) has been completed by the transfer module (100).

[0077] The inspection module (400) may be a configuration included in a notch heat treatment device of a cylindrical secondary battery vent cap according to one embodiment of the present invention, but may also be a separate, independent configuration separated from the notch heat treatment device.

[0078] This inspection module (400) may include an appearance inspection unit (410) and a fracture pressure inspection unit (420) as illustrated in FIG. 9.

[0079] The appearance inspection unit (410) is configured to acquire an image of the notch portion (11) using a camera or the like and to check the degree of discoloration of the notch portion (11) by utilizing the acquired image, and the breaking pressure inspection unit (420) performs the function of checking the breaking pressure of the notch portion (11) that has completed heat treatment. It is preferable that this breaking pressure be performed by sampling inspection rather than full inspection.

[0080] The control module (300) may be configured to include a transport module control unit (310), a laser output control unit (320), and a gas injection amount control unit (330) as illustrated in FIG. 8.

[0081] The transport module control unit (310) performs a function of controlling the operation of the transport module (100), the laser output control unit (320) performs a function of controlling the output of the laser irradiation unit (220), and the gas injection amount control unit (330) performs a function of controlling the amount of gas injected by the gas injection unit (230).

[0082] In particular, the notch heat treatment device of the cylindrical secondary battery vent cap according to the present invention can be configured to utilize the acquired big data to calculate an optimal process setting value for maintaining an appropriate breaking pressure of the notch portion (11) while minimizing discoloration of the notch portion (11), and for this purpose, the control module (300) is configured to further include a storage unit (340), a learning unit (350), and an optimal condition calculation unit (360).

[0083] The storage unit (340) performs the function of collecting and storing big data on the results of the inspection module (400) according to the laser output of the laser irradiation unit (220) and the amount of gas injected by the gas injection unit (230).

[0084] The learning unit (350) performs machine learning based on data stored in the storage unit (340), and the optimal condition generation unit (360) performs a function of generating the optimal output conditions of the laser (20) irradiated on the notch (11) and the optimal gas injection amount injected into the enclosure (210) based on the algorithm determined by the learning unit (350).

[0085] In particular, the algorithm determined in the learning unit (350) may be a deep learning algorithm in which the correlation between input factors and output factors is defined. In this case, the input factor is preferably at least one of the output power of the laser (20) irradiated by the laser irradiation unit (220), the output time of the laser (20), the irradiation path of the laser (20), the type of gas injected by the gas injection unit (230), the amount of gas injected, the cycle of gas injection, and the concentration of gas inside the enclosure (210), and the output factor is preferably at least one of the degree of discoloration of the notch portion (11) and the breaking pressure of the notch portion (11).

[0086] The laser output control unit (320) and the gas injection amount control unit (330) receive the optimal output conditions and optimal gas injection amount of the laser generated from the optimal condition calculation unit (360) and control the laser irradiation unit (220) and the gas injection unit (230), respectively, thereby enabling the provision of a cylindrical secondary battery vent cap with optimal quality.

[0087] In addition, the above-described gas injection unit (250) can also be controlled based on the results of the optimal condition calculation unit (360), and specifically, when the concentration inside the enclosure (210) is determined to be somewhat high, it may be possible to allow the outflow of gas through the inlet (211) or outlet (212) by stopping the formation of the gas curtain (30) by the gas injection unit (250).

[0088] Meanwhile, although the technical features of the present invention have been described with reference to a heat treatment device for a notch portion of a cylindrical secondary battery vent cap, the present invention is not limited thereto and may be applied to a plate-shaped member of a metal material having a fracture portion formed therein, such as a tin can, a beverage can, or a beer can.

[0089] In addition, the notch heat treatment device of the cylindrical secondary battery vent cap according to the first embodiment of the present invention and the notch heat treatment device of the cylindrical secondary battery vent cap according to the second embodiment may be configured independently, but are not limited thereto and may also be implemented by combining technical features.

[0090]

[0091] While the present invention has been described in detail using preferred embodiments, the scope of the present invention is not limited to the specific embodiments described above, and should be interpreted in accordance with the appended claims. Furthermore, those skilled in the art will appreciate that numerous modifications and variations are possible without departing from the scope of the present invention.

Claims

1. In a notch heat treatment device of a cylindrical secondary battery vent cap in which a notch is formed by press forming, A transport module for transporting the above cylindrical secondary battery vent cap in one direction; A laser heat treatment module that performs local heat treatment on the notch portion after receiving the cylindrical secondary battery vent cap from the transport module; Including, The above laser heat treatment module includes an enclosure in which an inlet for introducing a cylindrical secondary battery before heat treatment, an outlet for discharging a cylindrical secondary battery after heat treatment, a first through hole arranged on an upper surface, and a second through hole arranged on a lower surface are formed. A notch heat treatment device for a cylindrical secondary battery vent cap, characterized in that a first quartz plate and a second quartz plate are respectively arranged in the first through hole and the second through hole.

2. In claim 1, the laser heat treatment module, A first laser irradiation unit positioned on the upper part of the enclosure and irradiating a laser to the upper side of the notch portion of the cylindrical secondary battery vent cap through the first through hole; and A gas injection unit for injecting at least one of an inert gas and a hydrogen mixed gas into the enclosure; A heat treatment device for a notch portion of a cylindrical secondary battery vent cap, characterized in that it further includes a.

3. In claim 2, A temperature measuring unit positioned at the bottom of the enclosure and measuring the temperature of the lower side of the cylindrical secondary battery vent cap; A heat treatment device for a notch portion of a cylindrical secondary battery vent cap, characterized in that it further includes a.

4. In claim 3, An optical filter arranged above the temperature measuring unit to block light having a wavelength corresponding to the spectrum of a laser beam irradiated from the first laser irradiation unit; A notch heat treatment device for a secondary battery vent cap of a workpiece type, characterized by further including:

5. In claim 2, the laser heat treatment module, A second laser irradiation unit positioned at the lower portion of the enclosure and irradiating a laser to the lower portion of the notch portion of the cylindrical secondary battery vent cap through the second through hole; A heat treatment device for a notch portion of a cylindrical secondary battery vent cap, characterized in that it further includes a.

6. In claim 5, A control module for controlling the above laser heat treatment module; and An inspection module that performs inspection after receiving a cylindrical secondary battery vent cap whose notch has undergone heat treatment by the above-mentioned transfer module; A heat treatment device for a notch portion of a cylindrical secondary battery vent cap, characterized in that it further includes a.

7. In claim 6, the control module, A transport module control unit that controls the operation of the above transport module; A laser output control unit that controls the output of at least one of the first laser irradiation unit and the second laser irradiation unit; A gas injection amount control unit that controls the amount of gas injected by the above gas injection unit; A storage unit that collects and stores big data on the results of the inspection module according to the laser output of the first laser irradiation unit, the laser output of the second laser irradiation unit, and the amount of gas injected by the gas injection unit; A learning unit that performs machine learning based on data stored in the above storage unit; and An optimal condition calculation unit that generates optimal output conditions and optimal gas injection amount of the laser irradiated to the notch portion based on the algorithm determined by the learning unit; A heat treatment device for a notch portion of a cylindrical secondary battery vent cap, characterized by including a .

8. In claim 7, The above algorithm is a deep learning algorithm in which the correlation between input and output factors is defined. The above input factors are at least one of the output power of the laser irradiated from the first laser irradiation unit and the second laser irradiation unit, the output time of the laser, the irradiation path of the laser, the type of gas injected by the gas injection unit, the amount of gas injected, and the injection cycle of the gas. A notch heat treatment device for a cylindrical secondary battery vent cap, characterized in that the output factor is at least one of the degree of discoloration of the notch and the breaking pressure of the notch.

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