Hydrogen charging device

Abstract

The present invention relates to a hydrogen charging device comprising a hydrogen supply unit for supplying hydrogen, a hydrogen guide unit connected to the hydrogen supply unit for guiding hydrogen, a hydrogen injection unit connected to the hydrogen guide unit for injecting hydrogen that has passed through the hydrogen guide unit into a charging target, and a hydrogen discharge unit connected to the hydrogen injection unit for releasing hydrogen as needed. The hydrogen guide unit includes a first flow path unit connecting the hydrogen supply unit and the hydrogen injection unit for guiding cooled hydrogen, and a second flow path unit connecting the hydrogen supply unit and the hydrogen injection unit for guiding uncooled hydrogen.

Description

Technology Field

[0001] The present invention relates to a hydrogen refueling device, and more specifically, to a hydrogen refueling device that shortens the refueling time and reduces nozzle separation failure due to freezing at the end of refueling. Background Technology

[0002] Generally, a hydrogen charging system is a system for charging hydrogen to a target that operates using hydrogen as fuel. The hydrogen charging system includes a gas supply unit that supplies hydrogen gas compressed to a high pressure state, and a dispenser equipped with a nozzle for injecting the hydrogen gas supplied from the gas supply unit into the target.

[0003] Hydrogen gas charging is carried out by supplying high-pressure hydrogen to a low-pressure target using a pressure difference, and this process can lead to overheating. Overheated hydrogen shortens the lifespan of storage containers and increases the risk of explosion, so it must be prevented. Temperature fluctuations of hydrogen are influenced by the storage capacity and storage conditions (temperature, pressure) of the target, as well as charging conditions (temperature, pressure, flow rate); the fluctuation becomes greater when the storage capacity is small, the storage pressure is low, and the charging flow rate is high. Therefore, the hydrogen charging system additionally includes a flow control unit to limit the charging flow rate and a cooling unit to lower the temperature of the hydrogen.

[0004] The hydrogen charging process consists of a charging start stage, in which the pressure of the target is estimated by applying a connection pulse through the injection of a small amount of hydrogen; a main charging stage, in which charging continues while increasing the supply pressure; and a charging end stage, in which charging is stopped and residual pressure in hoses and nozzles is removed. In the charging start stage, the hydrogen storage pressure is low, so the temperature may rise rapidly due to the connection pulse; therefore, it is necessary to supply a minimum flow rate after sufficient cooling. In the initial part of the main charging stage, the amount of stored hydrogen is small, so the temperature fluctuation is large; however, as the amount of stored hydrogen increases towards the later part, the temperature fluctuation decreases.

[0005] Conventionally, when hydrogen is injected under low temperature and high pressure conditions, moisture on the nozzle surface cools rapidly and freezes, and as a result, there is a problem where the charging time increases due to separation failure caused by freezing of the nozzle after hydrogen charging is completed. Therefore, there is a need to improve this.

[0006] The background technology of the present invention is disclosed in Korean Published Patent Application No. 2022-0135441 (published on October 7, 2022; Title of Invention: Hydrogen Charging Device and Method for Controlling the Same). The problem to be solved

[0007] The present invention was devised to improve the above-mentioned problems, and aims to provide a hydrogen charging device that shortens the charging time and reduces nozzle separation failures caused by freezing at the end of charging. means of solving the problem

[0008] A hydrogen charging device according to the present invention comprises: a hydrogen supply unit for supplying hydrogen; a hydrogen guide unit connected to the hydrogen supply unit for guiding hydrogen; a hydrogen injection unit connected to the hydrogen guide unit for injecting hydrogen that has passed through the hydrogen guide unit into a charging target; and a hydrogen discharge unit connected to the hydrogen injection unit for releasing hydrogen as needed; wherein the hydrogen guide unit includes a first flow path unit connecting the hydrogen supply unit and the hydrogen injection unit for guiding cooled hydrogen; and a second flow path unit connecting the hydrogen supply unit and the hydrogen injection unit for guiding non-cooled hydrogen.

[0009] The above-mentioned first flow path may include: a first line section that connects the hydrogen supply section and the hydrogen injection section and guides the hydrogen; a first flow rate control section formed in the first line section and controls the flow rate of the hydrogen; and a first cooling section formed in the first line section and cools the hydrogen.

[0010] The above-mentioned first flow path may further include: a first flow detection unit formed in the first line section and detecting the flow rate of hydrogen before it is moved to the first flow control unit; and a first control valve unit formed in the first line section and controlling the flow rate of hydrogen that has passed through the first cooling unit.

[0011] The second flow path may include: a second line section connected to the first line section and guiding hydrogen by bypassing the first cooling section; and a second flow rate control section that controls the flow rate of hydrogen passing through the second line section.

[0012] The second flow control unit above may block hydrogen movement when the differential pressure is greater than or equal to the set differential pressure, and allow hydrogen movement when the differential pressure is less than the set differential pressure.

[0013] One end of the second line section is connected to the first line section connecting the first flow detection section and the first flow control section, and the other end is connected to the first line section connecting the first cooling section and the first control valve section, and the second flow control section may be formed in the second line section.

[0014] The first flow control unit and the second flow control unit are modularized to enable hydrogen movement, and the second line unit has one end connected to the second flow control unit and the other end connected to the first line unit connecting the first cooling unit and the first control valve unit.

[0015] The first control valve unit and the second flow control unit are modularized to enable hydrogen movement, and the second line unit may have one end connected to the first line unit connecting the first flow detection unit and the first flow control unit, and the other end connected to the second flow control unit. Effects of the invention

[0016] The hydrogen charging device according to the present invention can selectively supply hydrogen through a first flow path section that guides cooled hydrogen and a second flow path section that guides non-cooled hydrogen, thereby enabling optimized hydrogen charging according to the pressure and temperature of the charging target and improving cooling efficiency.

[0017] In the hydrogen charging device according to the present invention, cooled hydrogen can be supplied to a charging target through a first flow path during the initial charging stage.

[0018] In the hydrogen charging device according to the present invention, during the intermediate charging stage, hydrogen cooled through the first flow path and hydrogen not cooled through the second flow path can be mixed and supplied to the charging target.

[0019] In the hydrogen charging device according to the present invention, uncooled hydrogen can be supplied to the charging target through the second flow path during the final charging stage. This prevents the failure of the injection nozzle to separate due to freezing. Brief explanation of the drawing

[0020] FIG. 1 is a schematic diagram showing a hydrogen refueling device according to one embodiment of the present invention. FIG. 2 is a diagram schematically showing a first fluid passage according to one embodiment of the present invention. FIG. 3 is a schematic diagram showing a hydrogen emission unit according to one embodiment of the present invention. FIG. 4 is a diagram schematically showing a second fluid passage according to a first embodiment of the present invention. FIG. 5 is a diagram schematically showing a second fluid passage according to a second embodiment of the present invention. FIG. 6 is a schematic diagram showing a second fluid passage according to a third embodiment of the present invention. FIG. 7 is a diagram schematically showing the state of hydrogen movement when a hydrogen charging device according to one embodiment of the present invention is connected to a charging target. FIG. 8 is a diagram schematically showing the state of hydrogen movement at the start of a connection pulse in a hydrogen charging device according to one embodiment of the present invention. FIG. 9 is a diagram schematically showing the state of hydrogen movement at the end of a connection pulse in a hydrogen charging device according to one embodiment of the present invention. FIG. 10 is a diagram schematically showing the initial charging state of a hydrogen charging device according to one embodiment of the present invention. FIG. 11 is a diagram schematically showing the charging intermediate state in a hydrogen charging device according to one embodiment of the present invention. FIG. 12 is a diagram schematically showing the post-charging state of a hydrogen charging device according to one embodiment of the present invention. FIG. 13 is a diagram schematically showing the pressure state in a hydrogen refueling device according to one embodiment of the present invention. Specific details for implementing the invention

[0021] Hereinafter, embodiments of a hydrogen refueling device according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components depicted in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0022] FIG. 1 is a schematic diagram showing a hydrogen refueling device according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a first flow path section according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing a hydrogen discharge section according to an embodiment of the present invention. Referring to FIG. 1 to FIG. 3, a hydrogen refueling device (1) according to an embodiment of the present invention includes a hydrogen supply section (10), a hydrogen guide section (20), a hydrogen injection section (30), and a hydrogen discharge section (40).

[0023] The hydrogen supply unit (10) can supply hydrogen. For example, the hydrogen supply unit (10) can supply stored hydrogen. The hydrogen supply unit (10) can supply low-pressure or high-pressure hydrogen by being connected to a plurality of storage tanks.

[0024] The hydrogen guide unit (20) can be connected to the hydrogen supply unit (10) to guide hydrogen. For example, the hydrogen guide unit (20) can provide hydrogen optimized for the charging target (100) by controlling the flow rate and temperature of the hydrogen.

[0025] The hydrogen injection unit (30) is connected to the hydrogen guide unit (20), and hydrogen that has passed through the hydrogen guide unit (20) can be injected into the charging target (100). For example, the hydrogen injection unit (30) can be a nozzle or a dispenser and can be mounted on a vehicle.

[0026] The hydrogen discharge unit (40) is connected to the hydrogen injection unit (30) and can discharge hydrogen as needed. Residual hydrogen can be removed through the hydrogen discharge unit (40). The hydrogen discharge unit (40) can remove the remaining hydrogen when charging of the charging target (100) is completed, and can discharge overpressure hydrogen to the outside as needed to maintain a stable charging state of the device.

[0027] A hydrogen injection unit (30) according to one embodiment of the present invention may include an injection line (31) and an injection nozzle (32). The injection line (31) may be connected to a hydrogen guide unit (20) to provide a passage for the movement of hydrogen. The injection nozzle (32) is connected to the end of the injection line (31) and mounted on a charging target (100) to maintain a connection with the charging target (100). Hydrogen discharged through the injection nozzle (32) may be injected into the charging target (100) to perform hydrogen charging on the charging target (100).

[0028] A hydrogen discharge unit (40) according to one embodiment of the present invention may include a discharge line (41) and a discharge valve (42). The discharge line (41) may be connected to an injection line (31). The discharge valve (42) is formed in the discharge line (41) and can control the flow rate of hydrogen passing through the discharge line (41). The discharge valve (42) can open or close the discharge line (41).

[0029] The hydrogen guide section (20) may include a first flow path section (50) and a second flow path section (60).

[0030] The first Euro section (50) connects the hydrogen supply section (10) and the hydrogen injection section (30) and can guide cooled hydrogen. For example, the first Euro section (50) can cool the hydrogen supplied from the hydrogen supply section (10) to a set temperature.

[0031] The second Euro section (60) connects the hydrogen supply section (10) and the hydrogen injection section (30) and can guide non-cooled hydrogen. For example, the second Euro section (60) can guide hydrogen supplied from the hydrogen supply section (10) without changing its temperature. The second Euro section (60) can be connected to the first Euro section (50).

[0032] A first flow path (50) according to one embodiment of the present invention may include a first line section (51), a first flow rate control section (52), and a first cooling section (53).

[0033] The first line section (51) connects the hydrogen supply section (10) and the hydrogen injection section (30) and can guide hydrogen. For example, the first line section (51) can have a pipe shape that guides hydrogen.

[0034] The first flow rate control unit (52) is formed in the first line unit (51) and can control the flow rate of hydrogen. For example, the first flow rate control unit (52) can control the flow rate of hydrogen passing through the first line unit (51) by controlling the opening amount of the first line unit (51).

[0035] The first cooling unit (53) is formed in the first line unit (51) and can cool hydrogen. For example, the first cooling unit (53) can cool hydrogen that has passed through the first flow rate control unit (52) to a set temperature.

[0036] A first flow path (50) according to one embodiment of the present invention may further include a first flow rate sensing unit (54) and a first control valve unit (55).

[0037] The first flow rate sensing unit (54) is formed in the first line unit (51) and can detect the flow rate of hydrogen before it is moved to the first flow rate control unit (52). For example, the first flow rate sensing unit (54) may be positioned to detect hydrogen before the first flow rate control unit (52). The first flow rate control unit (52) can be driven to control the flow rate of hydrogen according to the value detected by the first flow rate sensing unit (54).

[0038] The first control valve section (55) is formed in the first line section (51) and can control the flow rate of hydrogen passing through the first cooling section (53). The first control valve section (55) can control the opening and closing of the first line section (51) to supply or block hydrogen.

[0039] FIG. 4 is a schematic diagram showing a second flow path according to a first embodiment of the present invention. FIG. 5 is a schematic diagram showing a second flow path according to a second embodiment of the present invention. FIG. 6 is a schematic diagram showing a second flow path according to a third embodiment of the present invention. Referring to FIG. 4 to 6, the second flow path (60) according to the present invention may include a second line section (61) and a second flow rate control section (62).

[0040] The second line section (61) is connected to the first line section (51) and can guide hydrogen by bypassing the first cooling section (53). The second flow rate control section (62) can control the flow rate of hydrogen passing through the second line section (61).

[0041] The second flow rate control unit (62) can block hydrogen movement when the differential pressure is greater than the set differential pressure even without a control signal, and allow hydrogen movement when the differential pressure decreases. That is, the second flow rate control unit (62) can allow or block hydrogen movement according to the set pressure conditions even without a separate control signal. Meanwhile, the first flow rate control unit (52) and the discharge valve (42) can control the amount of hydrogen flow according to the control signal.

[0042] As a first example, one end of the second line section (61) may be connected to the first line section (51) connecting the first flow rate sensing section (54) and the first flow rate control section (52). The other end of the second line section (61) may be connected to the first line section (51) connecting the first cooling section (53) and the first control valve section (55). The first flow rate control section (52) is formed in the second line section (61) and can control the flow rate of hydrogen passing through the second line section (61) (see FIG. 4).

[0043] In a second example, the first flow control unit (52) and the second flow control unit (62) are modularized to allow hydrogen movement (see FIG. 5). That is, a single module is equipped with the first flow control unit (52) and the second flow control unit (62), wherein the first flow control unit (52) is formed in the first line unit (51) and can control the flow amount of hydrogen passing through the first line unit (51). The second flow control unit (62) can be connected to the first flow control unit (52).

[0044] One end of the second line section (61) can be connected to the second flow control section (62). The other end of the second line section (61) can be connected to the first line section (51) connecting the first cooling section (53) and the first control valve section (55).

[0045] By the first flow control unit (52), hydrogen can be moved to the first cooling unit (53) by passing only through the first line unit (51) and blocked from moving to the second flow control unit (62). By the first flow control unit (52), hydrogen can be blocked from moving to the first line unit (51) and can be moved to the second flow control unit (62). By the first flow control unit (52), hydrogen can be moved to the first line unit (51) and the second flow control unit (62). Additionally, the first line unit (51) can be branched and connected to the first flow control unit (52) and the second flow control unit (62), respectively.

[0046] In a third example, the first control valve section (55) and the second flow control section (62) are modularized to allow hydrogen movement (see FIG. 6). That is, the first control valve section (55) and the second flow control section (62) are provided in one module, and the first control valve section (55) is formed in the first line section (51) to control the flow amount of hydrogen passing through the first line section (51). The second flow control section (62) can be connected to the first control valve section (55).

[0047] One end of the second line section (61) can be connected to the first line section (51) connecting the first flow rate sensing section (54) and the first flow rate control section (52). The other end of the second line section (61) can be connected to the second flow rate control section (62).

[0048] Hydrogen can be moved to the hydrogen injection unit (30) by passing through the first line unit (51) by the first control valve unit (55), and its movement to the second flow rate control unit (62) can be blocked. By the first control valve unit (55), hydrogen can be blocked from moving to the first line unit (51) after passing through the first cooling unit (53), and hydrogen can be guided to move to the first line unit (51) after passing through the second flow rate control unit (62) by bypassing the first cooling unit (53). Hydrogen that has passed through the first cooling unit (53) and hydrogen that has bypassed the first cooling unit (53) can be moved to the hydrogen injection unit (30) by the first control valve unit (55).

[0049] FIG. 7 is a diagram schematically illustrating the state of hydrogen movement when a hydrogen charging device according to an embodiment of the present invention is connected to a charging target. Referring to FIG. 7, when the injection nozzle (32) of the hydrogen injection unit (30) is connected to the charging target (100), the first flow rate control unit (52) and the first control valve unit (55) close the first line unit (51), and the discharge valve (42) opens the discharge line (41). At this time, the hydrogen supply is cut off, and high-pressure hydrogen remaining in the hydrogen discharge unit (40) and the charging target (100) can be discharged to the outside through the discharge line (41).

[0050] FIG. 8 is a diagram schematically illustrating the state of hydrogen movement at the start of a connection pulse in a hydrogen charging device according to an embodiment of the present invention. Referring to FIG. 8, before starting charging of a charging target (100), pressure and temperature information regarding the charging target (100) is acquired, and the pressure of the charging target (100) can be verified through the application of a connection pulse. At this time, the first flow rate control unit (52) and the first control valve unit (55) open the first line unit (51), and the discharge valve (42) closes the discharge line (41). Meanwhile, the second flow rate control unit (62) closes the second line unit (61) due to the pressure difference.

[0051] FIG. 9 is a diagram schematically showing the state of hydrogen movement when the connection pulse ends in a hydrogen refueling device according to one embodiment of the present invention. Referring to FIG. 9, after the connection pulse ends, the first flow rate control unit (52) and the first control valve unit (55) in FIG. 8 close the first line unit (51).

[0052] FIG. 10 is a diagram schematically showing the initial charging state of a hydrogen charging device according to one embodiment of the present invention. Referring to FIG. 10, the first flow rate control unit (52) and the first control valve unit (55) open the first line unit (51), and the second flow rate control unit (62) closes the second line unit (61) due to a pressure difference.

[0053] As described above, in the initial stage of charging, when the first flow control unit (52) passes a set amount of hydrogen, the hydrogen that has passed through the first flow control unit (52) can be supplied to the charging target (100) after being cooled in the first cooling unit (53). Depending on the charging target (100), hydrogen can be supplied to the charging target (100) at a preset temperature and amount.

[0054] FIG. 11 is a diagram schematically showing the charging intermediate state of a hydrogen charging device according to one embodiment of the present invention. Referring to FIG. 11, the first flow rate control unit (52) and the first control valve unit (55) open the first line unit (51), and the second flow rate control unit (62) opens the second line unit (61) as the pressure difference is eliminated.

[0055] As described above, during the intermediate charging stage, hydrogen supply through the second flow path (60) in addition to the first flow path (50) may be added depending on the pressure and temperature of the charging target (100). That is, when the first flow control unit (52) passes hydrogen in a set amount, the hydrogen that has passed through the first flow control unit (52) can be supplied to the charging target (100) after being cooled in the first cooling unit (53). And, when the second flow control unit (62) passes hydrogen in a set amount, the hydrogen that has passed through the second flow control unit (62) can be mixed with the hydrogen that has passed through the first cooling unit (53) and supplied to the charging target (100). This charging method can be applied during the intermediate stage when the charging start pressure of the charging target (100) is already high, or when charging is terminated early before reaching the maximum charging pressure.

[0056] FIG. 12 is a diagram schematically showing the post-charging state of a hydrogen charging device according to one embodiment of the present invention. Referring to FIG. 12, the first flow rate control unit (52) closes the first line unit (51), the first control valve unit (55) opens the first line unit (51), and the second flow rate control unit (62) opens the second line unit (61).

[0057] As described above, at the end stage of charging, charging through the first Euro section (50) is blocked, and hydrogen can be supplied only through the second Euro section (60). This prevents overcooling of the charging target (100) and improves cooling efficiency.

[0058] That is, hydrogen is supplied to the charging target (100) through the first Euro section (50) and the second Euro section (60), but depending on the internal temperature and pressure of the storage tank of the charging target (100), hydrogen can be supplied only through the second Euro section (60).

[0059] At this time, if the first flow control unit (52) blocks the movement of hydrogen to the first line unit (51) and the second flow control unit (62) passes a set amount of hydrogen, only the hydrogen that has passed through the second flow control unit (62) can be supplied to the charging target (100). In this charging method, even if hydrogen charging is performed only through the second line unit (61) in the final stage, the internal temperature change of the charging target (100) is not significant.

[0060] Meanwhile, if the required amount of charge is small compared to the storage capacity of the charging target (100), the initial charging stage can be omitted, and the intermediate or final charging stage can be applied to reduce cooling loss. That is, depending on the state of the charging target (100), the initial charging stage can be omitted, and the intermediate and final charging stages can proceed sequentially. Alternatively, depending on the state of the charging target (100), the initial and intermediate charging stages can be omitted, and the final charging stage can proceed. For example, if the charging target (100) has a storage capacity of about 6 kg in an ambient temperature environment, charging of about 1 to 2 kg is possible by applying only the final charging stage method according to the internal remaining amount at the start of charging. Therefore, emergency charging is possible by applying the final charging stage method in situations where the use of a cooler or pre-cooler is impossible.

[0061] FIG. 13 is a diagram schematically showing the depressurization state in a hydrogen charging device according to one embodiment of the present invention. Referring to FIG. 13, the first flow control unit (52) and the first control valve unit (55) close the first line unit (51), and the discharge valve (42) opens the discharge line (41). At this time, the hydrogen supply is cut off, and high-pressure hydrogen remaining in the hydrogen discharge unit (40) and the charging target (100) can be discharged to the outside through the discharge line (41).

[0062] In a hydrogen charging device (1) according to one embodiment of the present invention, since a first flow path (50) that guides cooled hydrogen and a second flow path (60) that guides non-cooled hydrogen can selectively supply hydrogen, hydrogen charging optimized according to the pressure and temperature of the charging target (100) is possible and cooling efficiency can be improved.

[0063] In a hydrogen charging device (1) according to one embodiment of the present invention, cooled hydrogen can be supplied to a charging target (100) through a first flow path (50) at the beginning of charging.

[0064] In a hydrogen charging device (1) according to one embodiment of the present invention, hydrogen cooled through a first flow path (50) and hydrogen not cooled through a second flow path (60) can be mixed and supplied to a charging target (100) during the charging process.

[0065] In a hydrogen charging device (1) according to one embodiment of the present invention, uncooled hydrogen can be supplied to a charging target (100) through a second flow path (60) at the end of the charging stage. This prevents the failure of the injection nozzle (32) to separate due to freezing.

[0066] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the claims below. Explanation of the symbols

[0067] 10 : Hydrogen supply unit 20 : Hydrogen guide unit 30: Hydrogen injection unit 31: Injection line 32 : Injection nozzle 40 : Hydrogen release section 41 ; Discharge line 42 : Discharge valve 50: 1st Euro Section 51: 1st Line Section 52: First flow control unit 53: First cooling unit 54: First flow detection unit 55: First control valve unit 60: 2nd Euro Section 61: 2nd Line Section 62 : Second flow control unit 100 : Charging target

Claims

Claim 1 A hydrogen supply unit for supplying hydrogen; a hydrogen guide unit connected to the hydrogen supply unit for guiding hydrogen; a hydrogen injection unit connected to the hydrogen guide unit for injecting hydrogen that has passed through the hydrogen guide unit into a charging target; and a hydrogen discharge unit connected to the hydrogen injection unit and capable of releasing hydrogen; wherein the hydrogen guide unit includes a first flow path unit connecting the hydrogen supply unit and the hydrogen injection unit and guiding cooled hydrogen; and a second flow path unit connecting the hydrogen supply unit and the hydrogen injection unit and guiding non-cooled hydrogen; wherein the first flow path unit includes a first line unit connecting the hydrogen supply unit and the hydrogen injection unit and guiding hydrogen; a first flow rate control unit formed in the first line unit and regulating the flow rate of hydrogen; and a first cooling unit formed in the first line unit and cooling hydrogen; and wherein the second flow path unit includes a second line unit connected to the first line unit and guiding hydrogen by bypassing the first cooling unit. A hydrogen charging device comprising: a second flow rate control unit for controlling the flow rate of hydrogen passing through the second line section; wherein the first flow rate control unit and the second flow rate control unit are modularized to enable hydrogen movement. Claim 2 delete Claim 3 A hydrogen charging device according to claim 1, further comprising: a first flow rate sensing unit formed in the first line unit and detecting the flow rate of hydrogen before it is moved to the first flow rate control unit; and a first control valve unit formed in the first line unit and controlling the flow rate of hydrogen that has passed through the first cooling unit. Claim 4 delete Claim 5 A hydrogen charging device according to claim 1, wherein the second flow rate control unit blocks hydrogen movement when the differential pressure is greater than or equal to the set differential pressure and allows hydrogen movement when the differential pressure is less than the set differential pressure. Claim 6 A hydrogen refueling device according to claim 3, wherein one end of the second line portion is connected to the first line portion connecting the first flow detection portion and the first flow control portion, and the other end is connected to the first line portion connecting the first cooling portion and the first control valve portion, and the second flow control portion is formed in the second line portion. Claim 7 A hydrogen refueling device according to claim 3, wherein one end of the second line section is connected to the second flow control section, and the other end is connected to the first line section connecting the first cooling section and the first control valve section. Claim 8 A hydrogen supply unit for supplying hydrogen; a hydrogen guide unit connected to the hydrogen supply unit for guiding hydrogen; a hydrogen injection unit connected to the hydrogen guide unit for injecting hydrogen that has passed through the hydrogen guide unit into a charging target; and a hydrogen discharge unit connected to the hydrogen injection unit and capable of releasing hydrogen; wherein the hydrogen guide unit includes a first flow path unit connecting the hydrogen supply unit and the hydrogen injection unit and guiding cooled hydrogen; and a second flow path unit connecting the hydrogen supply unit and the hydrogen injection unit and guiding non-cooled hydrogen; wherein the first flow path unit includes a first line unit connecting the hydrogen supply unit and the hydrogen injection unit and guiding hydrogen; a first flow rate control unit formed in the first line unit and regulating the flow rate of hydrogen; a first cooling unit formed in the first line unit and cooling the hydrogen; and a first flow rate detection unit formed in the first line unit and detecting the flow rate of hydrogen before moving to the first flow rate control unit. A hydrogen charging device comprising: a first control valve section formed in the first line section and controlling the flow rate of hydrogen passing through the first cooling section; a second line section connected to the first line section and guiding hydrogen by bypassing the first cooling section; and a second flow rate control section controlling the flow rate of hydrogen passing through the second line section; wherein the first control valve section and the second flow rate control section are modularized to enable hydrogen movement, and the second line section has one end connected to the first line section connecting the first flow rate sensing section and the first flow rate control section, and the other end connected to the second flow rate control section.

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