Cooling system for a fuel cell vehicle

Abstract

Cooling system for a fuel cell vehicle, comprising: a combined radiator (15) which cools a working fluid flowing through it to cool power components (24) and a water-cooled AC condenser (26), a pump (20) arranged in series with the combined radiator (15) for pumping the working fluid in the combined radiator (15) to the power components (24) and to the water-cooled AC condenser (26); a first branch pipe (1) and a second branch pipe (2) connecting the power components (24) and the water-cooled AC condenser (26) in parallel to each other and to the combined radiator (15) and the pump (20); a valve (5) connected to the first and second branch pipes (1, 2) and provided for selectively supplying the working fluid from the pump (20) to the first branch pipe (1) and the second branch pipe (2); and a storage tank (34) which stores the working fluid under a predetermined pressure or uses a specific structure with an open atmosphere and is arranged downstream of the flow components (24) on the first branch pipe (1), wherein the combined radiator (15) is a single radiator formed by combining a radiator for cooling the water-cooled AC condenser (26) and a radiator for cooling the power components (24), and wherein the combined radiator (15) is arranged in front of a fuel cell stack radiator (17) for cooling only one fuel cell stack (22).

Description

[0001] The present invention relates to a cooling system for a vehicle, more particularly for a fuel cell stack and for power components of a fuel cell vehicle.

[0002] Fuel cells have the advantage of generating electricity without environmental pollution because they produce little air pollutants and carbon dioxide, and also have higher power generation efficiency than state-of-the-art thermal power generation, so vehicles using a fuel cell as a power source have been increasingly developed.

[0003] Hybrid vehicles can appropriately use energy from an electric motor and an internal combustion engine to drive the vehicles according to the traveling conditions of the vehicles, and for fuel cell vehicles, the technology of driving a vehicle with an electric motor is required.

[0004] One problem with powering a vehicle with an electric motor is dissipating the heat generated by the operation of the motor and the heat generated by the phase change of the current in an inverter.

[0005] Therefore, it is technologically necessary to cool the power components, such as the electric motor and inverter, and to effectively cool the fuel cell stack.

[0006] Fig. 1 is a diagram illustrating a cooling system of a fuel cell vehicle in the prior art, which has a cooling circuit including a water pump, a storage tank, and a radiator for cooling power components, and a cooling circuit including a water pump, a storage tank, and a radiator for cooling a fuel cell stack, wherein a water-cooled AC condenser is arranged between the radiators to cool an air conditioner with a cooling fan.

[0007] Furthermore, the Fig. 2 is a water-cooling type cooling system of which the air conditioner is cooled with water, wherein a separate cooling circuit is provided which includes a water pump for distributing cooling water to the water-cooled air conditioner, a storage tank, and a radiator for cooling an air conditioner coolant, which is arranged between the fuel cell stack radiator and the power component radiator so as to be cooled by a cooling fan.

[0008] In the state-of-the-art cooling system, the Fig. The configuration shown in Figure 1 presents difficulties in ensuring sufficient cooling performance because the water-cooled AC condenser increases the ventilation resistance for the power component radiator and the fuel cell stack radiator. In particular, the power components and the fuel cell stack operate at low temperatures compared to the internal temperature of an internal combustion engine, and a high-performance radiator is required because the enthalpy is three times higher than that of internal combustion engines. However, increasing the thickness of the radiator increases the ventilation resistance, so technology is needed to optimize this situation.

[0009] On the other hand, the Fig. 2 has the problem of affecting the weight, volume, and price of the vehicle because many parts, including the water pump and the storage tank, are unnecessarily used to separately form a cooling circuit for the fuel cell stack, the power components, and the water-cooled AC condenser.

[0010] The information disclosed in this Background of the Invention section is provided only to enhance the understanding of the general background of the invention and should not be construed as an acknowledgement or any form of indication that this information constitutes prior art already known to those skilled in the art.

[0011] US 2009 / 0 280 395 A1 describes a cooling system for a fuel cell vehicle, comprising a radiator that cools working fluid flowing through it to cool power components, a pump arranged in series with the radiator for pumping the working fluid in the radiator to the power components, a first branch pipe and a second branch pipe connecting the power components to the radiator and the pump, a valve connected to the first and second branch pipes and provided for selectively supplying the working fluid from the pump to the first branch pipe and the second branch pipe, and a storage container that stores the working fluid under a predetermined pressure or uses a specific open atmosphere structure and is arranged downstream of the power components on the first branch pipe.

[0012] Further cooling systems are known from JP 2005-306 300 A, US 6 370 903 B1, WO 2004 / 005 830 A2, US 2008 / 0 034 767 A1, US 2005 / 0 167 169 A1, DE 100 59 369 A1 and DE 199 61 825 A1 as well as the subsequently published JP 2010-260 449 A, US 2011 / 0 053 025 A1 and JP 2010-173 357 A.

[0013] Various aspects of the present invention are directed to providing a cooling system for a fuel cell vehicle that minimizes the ventilation resistance of radiators for cooling the fuel cell stack and power components and ensures uniform and stable cooling performance for the fuel cell stack, the power components, and the water-cooled AC condenser, while reducing the weight of the vehicle, the volume of parts, and the cost by reducing the number of parts such as a water pump and a storage tank.

[0014] This is achieved according to the invention by a cooling system for a fuel cell vehicle according to the features of any one of claims 1, 6, 11, and 17. Advantageous further developments are described in the subclaims.

[0015] According to the present invention, it is possible to minimize the ventilation resistance of radiators for cooling a fuel cell stack and power components and ensure uniform and stable cooling performance for the fuel cell stack, power components, and water-cooled AC condenser, while reducing the weight of the vehicle, the volume of parts, and the cost by reducing the number of parts used, such as a water pump and a storage tank.

[0016] The methods and apparatus of the present invention also have other features and advantages which will be apparent from and set forth in detail in the accompanying drawings, which are incorporated in and constituting the present disclosure, and the following detailed description of the invention, and which together serve to explain certain principles of the present invention. Fig. 1 and Fig. 2 are diagrams illustrating embodiments of a cooling system for a vehicle in the prior art. Fig. 3 to 6 are diagrams illustrating embodiments of a cooling system for a vehicle according to the present invention.

[0017] It should be understood that the accompanying drawings are not necessarily to scale and are a somewhat simplified representation of various features intended to illustrate basic principles of the invention.

[0018] The specific embodiment of the present invention as disclosed herein, including, for example, specific dimensions, orientations, placements, and shapes, will be determined by the particular intended use and environment of use.

[0019] Like reference numerals designate the same or equivalent parts of the present invention throughout the several figures of the drawings.

[0020] Reference will now be made in detail to the various embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in connection with exemplary embodiments, it is to be understood that the present description is not intended to limit the invention to the exemplary embodiments. Rather, the invention is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments included within the spirit and scope of the invention.

[0021] Referring to Fig. 3, a first embodiment of the present invention includes a unified radiator 15 that cools all the cooling fluid flowing through it to cool power components 24 and a water-cooled AC condenser 26, a pump 20 arranged in series with the unified radiator 15 for pumping the working fluid in the unified radiator 15 to the power components 24 or the water-cooled AC condenser 26, a first branch pipe 1 and a second branch pipe 2 that connect the power components 24 and the water-cooled AC condenser 26 in parallel to each other and to the unified radiator 15 and the pump 20, and a valve 5 arranged to supply the working fluid from the pump 20 to the first branch pipe 1 and the second branch pipe 2.

[0022] That is, the single unified radiator 15 is formed by unifying a radiator for cooling the water-cooled AC condenser 26 and a radiator for cooling the power components 24—the radiators are separately provided in the prior art—and the valve 5 is provided for supplying the cooling water cooled by the unified radiator to the first branch pipe 1 and the second branch pipe 2.

[0023] The fuel cell stack 22 also has a separate cooling circuit, that is, as in the Fig. 3, a cooling circuit comprising a fuel cell stack radiator 17, a coolant pump 28 and a storage tank 30.

[0024] The unified radiator 15 is arranged in front of the fuel cell stack radiator 17, which only cools the fuel cell stack 22, and a cooling fan is arranged behind the fuel cell stack radiator 17, so that cooling air passes through the fuel cell stack radiator 17 after passing through the unified radiator 15, so that the cooling air first cools the unified radiator 15 for power components 24 and the AC condenser 26 and then the fuel cell stack radiator 17, since the operating temperature of the fuel cell stack 22 is relatively high.

[0025] Furthermore, the combined radiator 15 may be formed integrally with the fuel cell stack radiator 17, and may be formed such that only the working fluid passage is divided.

[0026] The pump 20 is arranged between the combined radiator 15 and the valve 5 to pump the working fluid from the combined radiator 15 to the valve 5, and a storage tank 34 that stores the working fluid is positioned downstream of the power components 24 on the first branch pipe 1. Furthermore, a separate storage tank may be additionally provided on the second branch pipe 2, and it is possible that only one storage tank 34 is arranged after the first branch pipe 1 and the second branch pipe 2 are joined.

[0027] The valve 5 may be a flow control valve that independently controls the flow rate of the working fluid flowing to the first branch pipe 1 and the working fluid flowing to the second branch pipe 2, so that it improves the cooling performance of the power components 24 by controlling the flow rate of the supplied working fluid in accordance with the load on the power components 24 and the air conditioner to reduce the thermal load on the water-cooled air conditioning system when necessary.

[0028] Furthermore, at high temperature and low speed driving or idling where the load on the air conditioner is the highest, the thermal load of the power components 24 is relatively small, so that the temperature of the cooling water flowing into the water-cooled AC condenser 26 is low and the pressure of the air conditioner is reduced or the compression work of an electric compressor is reduced, thereby contributing to improving fuel efficiency.

[0029] Furthermore, it is possible to reduce the number of pumps and storage tanks in the above-described system compared with a case where a cooling circuit for power components and a cooling circuit for a water-cooled AC condenser are separately provided according to the prior art, so that it is possible to reduce the weight of the vehicle, ensure space for the engine room, and accordingly reduce the cost of the vehicle.

[0030] The combined radiator 15 described above also has an increased capacity relative to the radiator for an electrical appliance in the prior art, and slightly increases its own ventilation resistance, but the ventilation resistance increases to a lesser extent than that increased by separately providing a water-cooled AC condenser or a radiator for cooling an air conditioning refrigerant in the prior art, so that it can be expected that the cooling performance can be increased due to the reduction of the ventilation resistance.

[0031] Fig. 4 shows a second embodiment of the present invention, which includes a unified radiator 15 that cools the working fluid flowing through it to cool power components 24 and a water-cooled AC condenser 26, a pump 20 arranged in series with the unified radiator 15 for pumping the coolant in the unified radiator 15 to the power components 24 and the water-cooled AC condenser 26, and a single coolant line 7 that forms a single closed circuit by connecting the water-cooled AC condenser 26 and the power components 24 in series with the unified radiator 15 and the pump 20.

[0032] That is, compared with the first embodiment of parallel type, the serial type allows the working fluid passing through the unified radiator 15 to be pumped by the pump 20 and sequentially cool the water-cooled AC condenser 26 and the power components 24.

[0033] The pump 20 is arranged between the combined radiator 15 and the water-cooled AC condenser 26 to pump the working fluid in the combined radiator 15 to the water-cooled AC condenser 26.

[0034] Furthermore, the water-cooled AC condenser 26 is arranged upstream of the power components 24 on the single coolant line 7, and a storage tank 34 which stores the working fluid is arranged downstream of the power components 24 on the single coolant line 7.

[0035] In this configuration, the working fluid cools the power components 24 after cooling the water-cooled AC condenser 26 because the operating temperature of the water-cooled AC condenser 26 is lower than that of the power components 24.

[0036] In the present embodiment, it is possible to improve the performance of cooling the power components by adjusting the rotation speed of an electric compressor that compresses the working fluid of the air conditioner at a low level in accordance with the operating temperature of the power components 24 to reduce the thermal load on the air conditioning system.

[0037] Furthermore, at high temperature and low speed driving or idling when the load on the air conditioner is the highest, the thermal load of the power components 24 is relatively small, so that the temperature of the cooling water flowing into the water-cooled AC condenser 26 is low and the pressure of the air conditioner is reduced or the compression work of an electric compressor is reduced, thereby contributing to increasing fuel efficiency.

[0038] The combined radiator 15 may also be formed integrally with the fuel cell stack radiator 17 for exclusively cooling the fuel cell stack 22, so that only the channel for the working fluid is divided.

[0039] Fig. 5 shows a third embodiment of the present invention, which includes a unified radiator 15 that cools all the working fluid flowing through it to a fuel cell stack 22 and a water-cooled AC condenser 26, a pump 28 arranged in series with the unified radiator 15 for pumping the coolant in the unified radiator 15 to the fuel cell stack 22 or the water-cooled AC condenser 26, a first branch pipe 1 and a second branch pipe 2 connecting the fuel cell stack 22 and the water-cooled AC condenser 26 in parallel to each other and to the unified radiator 15 and the pump 28, and a valve 5 arranged to supply the coolant from the pump 28 to the first branch pipe 1 and the second branch pipe 2.

[0040] That is, the single unified radiator 15 is formed by unifying a radiator for cooling the water-cooled AC condenser 26 and a radiator for cooling the fuel cell stack (the radiators are separately provided in the prior art), and the valve 5 is provided to properly guide the working fluid cooled by the unified radiator 15 to the first branch pipe 1 and the second branch pipe 2.

[0041] The power components 24 also have a separate cooling circuit, that is, as in the Fig. 5, a cooling circuit comprising a power component radiator 32, a pump 20 and a storage tank 34.

[0042] The unified radiator 15 is arranged behind the power component radiator 32 which exclusively cools the power components 24, and a cooling fan is arranged behind the unified radiator 15 so that cooling air passes through the unified radiator 15 after passing through the power component radiator 32, so that the cooling air first cools the power component radiator 32 and then the unified radiator 15 because the operating temperature of the fuel cell stack 22 is relatively high.

[0043] Furthermore, the combined radiator 15 is formed integrally with the power component radiator 32 and may be formed such that the channel for the working fluid is divided.

[0044] The pump 28 is arranged between the combined radiator 15 and the valve 5 to pump the working fluid from the combined radiator 15 to the valve 5, and a storage tank 30 that stores the working fluid is positioned downstream of the fuel cell stack 22 at the first branch pipe 1. Furthermore, a separate storage tank may be additionally provided at the second branch pipe 2, and it is possible for only one storage tank to be positioned downstream of the junction of the first branch pipe 1 and the second branch pipe 2.

[0045] The valve 5 may be a flow control valve that controls the flow rate of the working fluid flowing to the first branch pipe 1 and the second branch pipe 2, so that it controls the performance of cooling the fuel cell stack 22 by controlling the flow rate of the working fluid supplied to the water-cooled AC condenser 26 in accordance with the operating temperature of the fuel cell stack 22 to reduce the thermal load of the water-cooling type air conditioning system when necessary.

[0046] Furthermore, at high temperature and low speed driving or idling where the load on the air conditioner is the highest, the thermal load on the fuel cell stack 22 is relatively small, so that the temperature of the cooling water flowing into the water-cooled AC condenser 26 becomes low and the pressure of the air conditioner is reduced or the compression work of the electric compressor is reduced, thereby contributing to improving fuel efficiency.

[0047] Furthermore, it is possible to reduce the number of pumps and storage tanks in the above-described system compared with a case where a cooling circuit for the fuel cell stack and a cooling circuit for a water-cooled AC condenser are separately provided according to the prior art, so that it is possible to reduce the weight of the vehicle, ensure space for an engine room, and accordingly reduce the cost of the vehicle.

[0048] The combined radiator 15 described above also has an increased capacity relative to the fuel cell stack radiator in the prior art, and it slightly increases its own ventilation resistance, but the ventilation resistance increases to a lesser extent than that increased by providing a water-cooled AC condenser or a radiator for cooling an air conditioning refrigerant in the prior art, so it can be expected that the cooling performance can be increased due to the reduction of the ventilation resistance.

[0049] Fig.6 shows a fourth embodiment of the present invention, which includes a unified radiator 15 that cools working fluid flowing therethrough to cool a fuel cell stack 22 and a water-cooled AC condenser 26, a pump 28 arranged in series with the unified radiator 15 for pumping the coolant in the unified radiator 15 to the fuel cell stack 22 and the water-cooled AC condenser 26, and a single coolant line 7 that forms a single closed cooling circuit by connecting the water-cooled AC condenser 26 in series with the fuel cell stack 22, the unified radiator 15, and the pump 28.

[0050] That is, compared with the third parallel type embodiment, the serial type embodiment allows the working fluid passing through the unified radiator 15 to be pumped and sequentially cool the water-cooled AC condenser 26 and the fuel cell stack 22.

[0051] The pump 28 is arranged between the combined radiator 15 and the water-cooled AC condenser 26 to pump the working fluid from the combined radiator 15 to the water-cooled AC condenser 26.

[0052] Furthermore, the water-cooled AC condenser 26 is positioned upstream of the fuel cell stack 22 on the single coolant line 7, and a storage tank 30 which stores the working fluid is positioned downstream of the fuel cell stack 22 on the single coolant line 7.

[0053] In this configuration, the coolant cools the fuel cell stack 22 after cooling the AC condenser 26 because the operating temperature of the water-cooled AC condenser 26 is lower than that of the fuel cell stack 22.

[0054] In the present embodiment, it is possible to improve the cooling performance of the fuel cell stack 22 by adjusting the rotation speed of the electric compressor that compresses the refrigerant of the air conditioner at low pressure in accordance with the operating temperature of the fuel cell stack 22 to reduce the enthalpy of the air conditioning system.

[0055] Furthermore, at high temperature and low-speed driving or idling when the load on the air conditioner is the highest, the thermal load on the fuel cell stack 22 is relatively low, so that the temperature of the cooling water flowing into the water-cooled AC condenser 26 is low and the pressure of the air conditioner is reduced or the compression work of the electric compressor is reduced, thereby contributing to increasing fuel efficiency.

[0056] The combined radiator 15 may also be formed integrally with the power component radiator 32 for exclusively cooling the power components 24, so that only the channel for the working fluid is divided.

[0057] Furthermore, the power component radiator 32 for exclusively cooling the power components 24 may be arranged in front of or parallel to the combined radiator 15 in the third embodiment and the fourth embodiment.

[0058] For convenience in description and for accurate definition in the appended claims, the terms "upstream" and "downstream" are used to describe features of the exemplary embodiments with reference to the positions of such features as illustrated in the figures.

[0059] The foregoing descriptions of certain exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and use various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof.

Claims

[1] Cooling system for a fuel cell vehicle, comprising: a combined radiator (15) which cools a working fluid flowing through it to cool power components (24) and a water-cooled AC condenser (26), a pump (20) arranged in series with the combined radiator (15) for pumping the working fluid in the combined radiator (15) to the power components (24) and to the water-cooled AC condenser (26); a first branch pipe (1) and a second branch pipe (2) connecting the power components (24) and the water-cooled AC condenser (26) in parallel to each other and to the combined radiator (15) and the pump (20); a valve (5) connected to the first and second branch pipes (1, 2) and provided for selectively supplying the working fluid from the pump (20) to the first branch pipe (1) and the second branch pipe (2); and a storage tank (34) which stores the working fluid under a predetermined pressure or uses a specific structure with an open atmosphere and is arranged downstream of the flow components (24) on the first branch pipe (1), wherein the combined radiator (15) is a single radiator formed by combining a radiator for cooling the water-cooled AC condenser (26) and a radiator for cooling the power components (24), and wherein the combined radiator (15) is arranged in front of a fuel cell stack radiator (17) for cooling only one fuel cell stack (22). [2] A cooling system for a fuel cell vehicle according to claim 1, wherein the pump (20) is arranged between the combined radiator (15) and the valve (5) and pumps the working fluid from the combined radiator (15) to the valve (5). [3] A cooling system for a fuel cell vehicle according to claim 1, wherein a cooling fan is arranged behind the fuel cell stack radiator (17) so that cooling air passes through the fuel cell stack radiator (17) after passing through the unified radiator (15). [4] A cooling system for a fuel cell vehicle according to claim 3, wherein the unified radiator (15) is formed integrally with the fuel cell stack radiator (17) for cooling only the fuel cell stack (22) so that only the channel for the working fluid is divided. [5] Cooling system for a fuel cell vehicle according to claim 1, wherein at least one or more storage containers (30, 34) are provided which store the flowing working fluid. [6] Cooling system for a fuel cell vehicle, comprising: a combined radiator (15) which cools a working fluid flowing therethrough to cool power components (24) and a water-cooled AC condenser (26); a pump (20) arranged in series with the combined radiator (15) for pumping a coolant in the combined radiator (15) to the power components (24) and the water-cooled AC condenser (26); a single coolant line (7) forming a single closed circuit by connecting the water-cooled AC condenser (26) in series with the power components (24), the combined radiator (15) and the pump (20); and a storage tank (34) which stores the working fluid under a specific pressure or using a specific structure with an open atmosphere and is connected downstream of the power components (24) in the single coolant line (7), wherein the combined radiator (15) is a single radiator formed by combining a radiator for cooling the water-cooled AC condenser (26) and a radiator for cooling the power components (24), wherein the combined radiator (15) is arranged in front of a fuel cell stack radiator (17) for cooling only one fuel cell stack (22), wherein the water-cooled AC condenser (26) is positioned upstream of the power components (24) on the single coolant line (7), the operating temperature of the water-cooled AC condenser (26) being lower than that of the power components (24), and wherein the combined radiator (15) is formed integrally with the fuel cell stack radiator (17) for exclusively cooling the fuel cell stack (22). [7] A cooling system for a fuel cell vehicle according to claim 6, wherein the pump (20) is positioned between the unified radiator (15) and the water-cooled AC condenser (26) to pump the working fluid from the unified radiator (15) to the water-cooled AC condenser (26). [8] A cooling system for a fuel cell vehicle according to claim 6, wherein a cooling fan is arranged behind the fuel cell stack radiator (17) so that cooling air passes through the fuel cell stack radiator (17) after passing through the unified radiator (15). [9] A cooling system for a fuel cell vehicle according to claim 8, wherein only the channel for the working fluid is divided. [10] Cooling system for a fuel cell vehicle according to claim 6, wherein at least one or more storage containers (30, 34) are provided which store the flowing working fluid. [11] Cooling system for a fuel cell vehicle, comprising: a combined radiator (15) that cools a working fluid flowing therethrough to cool a fuel cell stack (22) and a water-cooled AC condenser (26); a pump (28) arranged in series with the combined radiator (15) for pumping the working fluid in the combined radiator (15) to the fuel cell stack (22) and the water-cooled AC condenser (26); a first branch pipe (1) and a second branch pipe (2) connecting the fuel cell stack (22) and the water-cooled AC condenser (26) in parallel to each other and to the combined radiator (15) and the pump (28); a valve (5) connected to the first branch pipe (1) and the second branch pipe (2) and provided to supply the working fluid from the pump (28) to the first branch pipe (1) and the second branch pipe (2); and a storage tank (30) which stores the working fluid under a predetermined pressure or using a specific open atmosphere structure and is positioned downstream of the fuel cell stack (22) on the first branch pipe (1), wherein the combined radiator (15) is a single radiator formed by combining a radiator for cooling the water-cooled AC condenser (26) and a radiator for cooling the fuel cell stack (22), and wherein the combined radiator (15) is arranged behind a power component radiator (32) for cooling only power components (24). [12] A cooling system for a fuel cell vehicle according to claim 11, wherein the pump (28) is arranged between the combined radiator (15) and the valve (5) to pump the working fluid from the combined radiator (15) to the valve (5). [13] A cooling system for a fuel cell vehicle according to claim 11, wherein a cooling fan is arranged behind the unified radiator (15) so that cooling air passes through the unified radiator (15) after passing through the power component radiator (32). [14] A cooling system for a fuel cell vehicle according to claim 13, wherein the combined radiator (15) is arranged in parallel above the power component radiator (32) for exclusively cooling the power components (24). [15] A cooling system for a fuel cell vehicle according to claim 11, wherein at least one or more storage containers (30, 34) are provided which store the flowing working fluid. [16] A cooling system for a fuel cell vehicle according to claim 13, wherein the unified radiator (15) is formed integrally with the power component radiator (32) for cooling only the power components (24) so ​​that only the channel for the working fluid is divided. [17] Cooling system for a fuel cell vehicle, comprising: a combined radiator (15) that cools a working fluid flowing therethrough to cool a fuel cell stack (22) and a water-cooled AC condenser (26); a pump (28) arranged in series with the combined radiator (15) for pumping a coolant in the combined radiator (15) to the fuel cell stack (22) and the water-cooled AC condenser (26); a single coolant line (7) forming a single closed circuit by connecting the water-cooled AC condenser (26) in series with the fuel cell stack (22), the combined radiator (15) and the pump (28); and a storage tank (30) which stores the working fluid under a specific pressure or using a specific open atmosphere structure and is arranged downstream of the fuel cell stack (22) on the single coolant line (7), wherein the combined radiator (15) is a single radiator formed by combining a radiator for cooling the water-cooled AC condenser (26) and a radiator for cooling the fuel cell stack (22), and wherein the combined radiator (15) is arranged behind a power component radiator (32) for cooling only power components (24). [18] A cooling system for a fuel cell vehicle according to claim 17, wherein the water-cooled AC condenser (26) is positioned upstream of the fuel cell stack (22) on the single coolant line (7). [19] A cooling system for a fuel cell vehicle according to claim 17, wherein the pump (28) is positioned between the unified radiator (15) and the water-cooled AC condenser (26) to pump the working fluid from the unified radiator (15) to the water-cooled AC condenser (26). [20] A cooling system for a fuel cell vehicle according to claim 17, wherein a cooling fan is arranged behind the unified radiator (15) so that cooling air passes through the unified radiator (15) after passing through the power component radiator (32). [21] Cooling system for a fuel cell vehicle according to claim 20, wherein the combined radiator (15) is positioned in parallel above the power component radiator (32) for cooling only the power components (24) [22] A cooling system for a fuel cell vehicle according to claim 17, wherein at least one or more storage containers (30, 34) are provided which store the flowing working fluid. [23] A cooling system for a fuel cell vehicle according to claim 20, wherein the combined radiator (15) is formed integrally with the power component radiator (32) for exclusively cooling only the power components (24) so ​​that only the channel for the working fluid is divided.

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