JP2001339808A - Device for cooling fuel cell car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for cooling a fuel cell car capable of cooling a fuel cell to maintain it within an appropriate temperature range and also capable of efficiently cooling a heat generating source including a motor for traveling to maintain the source within an appropriate temperature range without making the structure of the cooling device large or redundant. SOLUTION: This device is provided with a primary circulating route (12) of the primary cooling liquid that cools the fuel cell (1), a secondary circulating route (14) of the secondary cooling liquid that cools the heat generating source including the motor (2) for traveling, a first heat exchanger (15) that exchanges heat between the primary and secondary cooling liquids, and second and third heat exchangers (16), (21) that exchange heat between the secondary cooling liquid and outside air. The secondary circulating route (14) has a main circulating route (14A) via the first and second heat exchangers (15), (16) and a sub- circulating route (14B) via the third heat exchanger (21) and the motor (2) for traveling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell vehicle in which a fuel cell is mounted as a power source for a driving motor.
More specifically, the present invention relates to a cooling device for a fuel cell vehicle that cools a heat generation source including the fuel cell and the traveling motor.

[0002]

2. Description of the Related Art In recent years, various electric vehicles equipped with a traveling motor instead of an engine have been developed. And
As one of such electric vehicles, for example, PEMFC
The development of a fuel cell vehicle equipped with a hydrogen ion exchange membrane fuel cell (hereinafter, referred to as a PEM fuel cell), which is abbreviated as “Proton Exchange Membrane Fuel Cell”, as a power source for a traveling motor is being rapidly promoted.

[0003] The PEM fuel cell is configured as a stack having a structure in which a number of cells as power generation units are stacked. Each of the cells has a structure in which a membrane / electrode assembly called MEA (Membrane Electrode Assembly) is sandwiched between an anode-side separator having a hydrogen supply path and a cathode-side separator having an oxygen supply path. . In the MEA, an anode-side electrode catalyst layer and a gas diffusion layer are sequentially laminated on one side of a hydrogen ion exchange membrane, and a cathode-side electrode catalyst layer and a gas diffusion layer are sequentially laminated on another side of the hydrogen ion exchange membrane. It is configured.

[0004] Such a PEM type fuel cell is characterized by the ME
When hydrogen ions pass through the hydrogen ion exchange membrane from the anode side to the cathode side in the wet state of A, an electromotive force of about 1 V is generated in each cell unit. In the PEM fuel cell, the most stable output state can be obtained in a temperature environment of, for example, about 75 to 85 ° C., and the circuit configuration is configured to drive the traveling motor from the output current control device via the drive unit. Have been.

Here, a fuel cell vehicle equipped with this type of fuel cell is provided with a cooling device for cooling a heat source including a fuel cell and a motor for running. For example, Japanese Patent Application Laid-Open No. H11-178116 discloses a cooling device that cools a fuel cell and a vehicle driving motor (running motor) with cooling water circulating through a radiator with an electric cooling fan.

[0006]

By the way, in the cooling device disclosed in the above publication, the cooling water circulating through a single radiator is used in addition to the fuel cell system including the fuel cell, the compressor, and the reformer, as well as the electric power. It also cools the converter and the vehicle drive motor (running motor). For this reason, a large cooling capacity is required for the radiator, and there is a problem that the radiator becomes large. In addition, there is a problem that it is difficult to cool the fuel cell and the traveling motor to the respective optimum temperatures. However, if the cooling system for the fuel cell and the cooling system for the traveling motor and the like are completely independent, such a problem can be solved, but in that case, the configuration of the cooling device becomes redundant.

Accordingly, the present invention is capable of cooling a fuel cell and maintaining the temperature within an appropriate temperature range without increasing the size or redundancy of the cooling device, and efficiently cooling a heat generating source including a traveling motor to achieve an appropriate temperature. It is an object to provide a cooling device for a fuel cell vehicle that can be maintained in a range.

[0008]

As means for solving the above problems, a cooling device for a fuel cell vehicle according to the present invention comprises:
A cooling device for a fuel cell vehicle in which a fuel cell is mounted as a power source of a traveling motor, wherein a primary circulation channel configured to be able to cool the fuel cell by a primary coolant circulated by a primary circulation pump. A secondary circulation passage configured to be able to cool a heat generation source including the traveling motor by a secondary coolant circulated by a secondary circulation pump, and a primary coolant in the primary circulation passage. A first heat exchanger for exchanging heat between the secondary cooling liquid in the secondary circulation flow path and a second heat exchanging heat between the secondary cooling liquid in the secondary circulation flow path and the outside air. An exchange and a third heat exchanger, wherein the secondary circulation passage is a main circulation passage returning from the secondary circulation pump to the secondary circulation pump via the first heat exchanger and the second heat exchanger. When,
It is characterized by having a third heat exchanger from the secondary circulation pump, a heat generation source including the traveling motor, and a sub-circulation flow path returning to the secondary circulation pump via the second heat exchanger.

In the cooling apparatus for a fuel cell vehicle according to the present invention, the primary cooling liquid circulates in the primary circulation flow path and the secondary cooling liquid circulates in the secondary circulation by operating the primary circulation pump and the secondary circulation pump. The main circulation path and the sub circulation path of the flow path are circulated. The primary coolant circulating in the primary circulation channel cools the fuel cell and absorbs heat, and is cooled by the first heat exchanger.
Heat is exchanged with the next coolant to release heat. On the other hand, the secondary coolant circulating in the main circulation channel of the secondary circulation channel exchanges heat with the primary coolant in the first heat exchanger to absorb heat, and exchanges heat with the outside air in the second heat exchanger. To dissipate heat. The secondary coolant circulating in the sub-circulation passage of the secondary circulation passage exchanges heat with the outside air in the third heat exchanger to radiate heat, cools a heat generation source including the traveling motor, and absorbs heat. The second heat exchanger exchanges heat with the outside air and radiates heat.

The fuel cell is usually a PEM fuel cell belonging to a polymer electrolyte fuel cell, but may be another type of fuel cell as long as the fuel cell is mounted on a vehicle as a power source for a traveling motor. You may. In addition, the traveling motor has 2
Any type may be used as long as it can be cooled by the next cooling liquid.

In the cooling device for a fuel cell vehicle according to the present invention, in order to prevent a liquid junction phenomenon of the fuel cell, the primary circulation channel is made of an insulating material or a material in which ions are hardly eluted, Preferably, the conductivity of the primary coolant is kept low. In this case, as the primary cooling liquid, it is preferable to use pure water or an ethylene glycol-based antifreeze, abbreviated as LLC (Long Life Coolant) having a low freezing point, in combination with the ion exchanger, but use an insulating oil. You can also.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a cooling device for a fuel cell vehicle according to the present invention will be described with reference to the drawings.
In the drawings to be referred to, FIG. 1 is a circuit configuration diagram of a cooling device for a fuel cell vehicle according to one embodiment, and FIG. 2 is a partial cross-sectional view showing a cell structure of the fuel cell shown in FIG.

As shown in FIG. 1, the cooling device for a fuel cell vehicle according to one embodiment is intended for a fuel cell vehicle in which a fuel cell (FC) 1 is mounted as a power supply for a traveling motor (EVM) 2. . This fuel cell vehicle includes an air supply system 3 for supplying air (oxygen) to the cathode side of the fuel cell (FC) 1 and an exhaust system 4. Further, a hydrogen gas supply system 5 for supplying hydrogen gas to the anode side of the fuel cell (FC) 1 is provided.

The air supply system 3 of the fuel cell 1 includes a muffler 3A, an air filter 3 from the upstream side to the downstream side.
B, turbocharger (S / C) 3C, intercooler (INTC)
LR) 3D. The hydrogen gas supply system 5 of the fuel cell 1 is provided with a hydrogen tank 5A, a control valve 5B, and an ejector 5C from the upstream side to the downstream side. It is configured to be returned to the ejector 5C.

The fuel cell 1 has an output current control device (D
The circuit is configured to supply power to a battery 7 and a drive unit (PDU) 8 via a C / DC 6. The drive unit 8 is configured to control the drive of at least the traveling motor 2 and the drive motor 3E of the supercharger 3C. The traveling motor 2 is configured to transmit power to driving wheels 9 of a fuel cell vehicle. The fuel cell 1 is housed in a fuel cell box 10 disposed under the floor of a passenger compartment of a fuel cell vehicle.

The fuel cell 1 is a PEM type fuel cell having a structure in which a large number of cells as power generation units are stacked. For example, in a temperature environment of about 75 to 85 ° C., the most stable output state can be obtained. Here, as shown in FIG. 2, each cell C constituting the fuel cell 1 includes a cathode separator C2 having an oxygen supply passage C1 on the inner surface side and an anode separator C4 having a hydrogen supply passage C3 on the inner surface side. A structure in which a membrane-electrode assembly (MEA) C6 having a seal C5 is interposed therebetween. This membrane / electrode assembly C6 is
The cathode-side electrode catalyst layer C is provided on one side of the hydrogen ion exchange membrane C7.
8 and a gas diffusion layer C9 are sequentially laminated, and an anode-side electrode catalyst layer C10 and a gas diffusion layer C11 are sequentially laminated on another surface of the hydrogen ion exchange membrane C7.
And, on the outer surface side of the anode side separator C4,
A cooling liquid passage C12 is formed.

As shown in FIG. 1, a cooling device for a fuel cell vehicle according to one embodiment has a primary cooling liquid circulated by a primary circulation pump 11 so as to cool the fuel cell 1. Circulation channel 12 and secondary circulation pump 13
The secondary circulation flow path configured to be able to cool the traveling motor 2, the drive unit 8, the drive motor 3E of the supercharger 3C and the output current control device 6, which are heat sources, by the secondary coolant circulated by the 14 is provided. Further, a first heat exchanger 15 for exchanging heat between the primary coolant in the primary circulation channel 12 and the secondary coolant in the secondary circulation channel 14, A second heat exchanger 16 and a third heat exchanger 21 for exchanging heat between the secondary coolant and the outside air are provided. The secondary circulation passage 14 for the output current control device 6 is omitted in FIG.

The primary circulation channel 12 circulates the primary coolant from the primary circulation pump 11 to the primary circulation pump 11 via the coolant channel C12 of the fuel cell 1 and the first heat exchanger 15. The flow path is mainly configured. First heat exchanger 15
A thermostat valve 17 is interposed in the flow path between the first circulation pump 11 and the thermostat valve 17.
A bypass passage 12A branched from the first heat exchanger 15 is provided in parallel with the first heat exchanger 15. The thermostat valve 17
The valve opening temperature is set to, for example, 85 ° C., and when the temperature of the primary coolant is at least less than 75 ° C., the flow path between the primary circulation pump 11 and the first heat exchanger 15 is closed. When the temperature of the cooling liquid reaches 85 ° C., the passage is opened.

In the primary circulation flow path 12, a communication path 12B branched from a flow path between the primary circulation pump 11 and the fuel cell 1 is provided in parallel with the bypass flow path 12A. An ion exchanger 18 for adsorbing metal ions eluted into the primary circulation channel 12 is provided in the communication path 12B.

The bypass passage 12A and the communication passage 12
The primary circulation channel 12 including B is housed in the fuel cell box 10 together with the first heat exchanger 15. The first heat exchanger 15 is arranged in the vicinity of the fuel cell 1, and accordingly, the length of the primary circulation channel 12 is shortened. The shortened primary circulation channel 12
Is made of an appropriate material from which ions are hardly eluted, for example, an insulating material such as a stainless steel tube or a synthetic resin tube in order to prevent a liquid junction phenomenon of the fuel cell 1. In order to prevent the liquid junction phenomenon, as the primary coolant, pure water or an LLC (Long Life Coolan) having a low electrical conductivity is used.
It is preferred to use an ethylene glycol-based antifreeze, abbreviated as t), but it is also possible to use insulating oil.

The secondary circulation flow path 14 is connected to the secondary heat pump 15, the first heat exchanger 15, the intercooler 3D,
A main circulation flow path 14A that returns to the secondary circulation pump 13 via the heat exchanger 16 is provided. In addition, the secondary circulation channel 14 is connected to the third heat exchanger 21 from the secondary circulation pump 13,
The traveling motor 2, the drive unit 8, which is a heat generation source,
A sub-circulation flow path 14B that returns to the secondary circulation pump 13 via the drive motor 3E of the supercharger 3C, the output current control device 6, and the second heat exchanger 16 is provided.

The traveling motor 2, the drive unit 8, the drive motor 3E of the supercharger 3C and the output current control device 6
Are connected in parallel with each other to the sub-circulation flow path 14B. That is, a water jacket (not shown) formed around the stator of the traveling motor 2,
A water jacket (not shown) formed on the heat sink of the drive unit 8, a water jacket (not shown) formed around the stator of the drive motor 3E, and a water jacket (not shown) formed on the heat sink of the output current control device 6. ) Are connected to the sub-circulation flow path 14B in parallel with each other.

The first heat exchanger 15 is provided in the secondary circulation passage 1
4 is a liquid-cooled heat exchanger that cools the primary coolant circulating in the primary circulation channel 12 with the secondary coolant circulating in the main circulation channel 14A. Further, the second heat exchanger 16 is an air-cooled heat exchanger provided with an electric cooling fan 19, and supplies the secondary cooling liquid circulating in the secondary circulation flow path 14 with the traveling wind or the blowing of the electric cooling fan 19. Cool by. Further, the third heat exchanger 21 is an air-cooled heat exchanger provided with an electric cooling fan 22, and the second heat exchanger 21 uses the electric cooling fan to circulate the secondary coolant circulating in the sub-circulation passage 14 </ b> B of the secondary circulation passage 14. Cooling is performed by the air blow of 22.

As shown in FIG. 4, the primary circulation pump 1
The primary and secondary circulation pumps 13 are provided with rotary shafts 20A, 20A.
Are rotatably connected to both sides of a single pump drive motor 20 projecting from both sides. That is, the housing 11A of the primary circulation pump 11
Fixed to one side of the impeller 11 of the primary circulation pump 11
B is connected to one rotation shaft 20A. Similarly, 2
A housing 13A of the secondary circulation pump 13 is fixed to another side of the pump drive motor 20, and an impeller 13B of the secondary circulation pump 13 is connected to the other rotating shaft 20A.

The primary circulation passage 12 in which the primary circulation pump 11 is provided is provided with a coolant passage C12 of the fuel cell 1.
Is large, the inner diameter of the inlet 11C of the primary circulation pump 11 is smaller than that of the inlet 13 of the secondary circulation pump 13.
It is set slightly larger than the inner diameter of C. By the way, 1
The inner diameter of the inlet 11C of the secondary circulation pump 11 is, for example, 29
mm, and the inside diameter of the inlet 13C of the secondary circulation pump 13 is set to, for example, 27 mm.

The impeller 11B of the primary circulation pump 11
Is constituted by six blades as shown in FIG. 4 (a), and the impeller 13B of the secondary circulation pump 13 is constituted by seven blades as shown in FIG. 4 (b). The diameter of the impeller 11B having six blades of the primary circulation pump 11 is 2
The diameter is set smaller than the diameter of the impeller 13B of the seven blades of the next circulation pump 13. By the way, primary circulation pump 1
The diameter of one impeller 11B is set to, for example, 45 mm, and the diameter of the impeller 11B of the secondary circulation pump 13 is set to, for example, 53 mm.

The pump drive motor 20 is a high-voltage power supply motor whose drive is controlled by the drive unit 8. The relative flow rates of the primary circulation pump 11 and the secondary circulation pump 13 driven at the same rotation speed by the pump drive motor 20 are specific heat and density indicating the heat capacity of the primary coolant, and the calorific value of the fuel cell 1. , The characteristics of the primary circulation channel 12 such as the heat exchange rate of the first heat exchanger 15, the specific heat and density indicating the heat capacity of the secondary coolant, the second heat exchanger 16 and the third heat exchanger.
The setting is made according to the characteristics of the secondary circulation channel 14 such as the heat exchange rate of the heat exchanger 21.

That is, the rotation speed of the pump drive motor 20 is a specified value, the second heat exchanger 16 and the third heat exchanger 21 radiate heat to a specified temperature with a specified air volume, and the output of the fuel cell 1 is maximum. Under a certain condition, the primary heat exchanger 15 is set so that the temperature difference between the temperature of the primary coolant on the inlet side and the temperature of the primary coolant on the outlet side becomes a specified value (for example, 10 ° C.). The flow rate of the circulation pump 11 is set, and the flow rate of the secondary circulation pump 13 is set such that the temperature of the primary coolant on the outlet side of the first heat exchanger 15 becomes a specified value (for example, 75 ° C.). Specifically, the temperature of the primary coolant on the inlet side of the first heat exchanger 15 is 8
5 ° C., the temperature of the primary coolant on the outlet side of the first heat exchanger 15 is 75 ° C., the temperature of the secondary coolant on the inlet side of the second heat exchanger 16 is 70 ° C., and the temperature of the second heat exchanger 16 The primary circulation pumps 11 and 2 are controlled so that the temperature of the secondary coolant on the outlet side becomes 60 ° C.
The flow ratio with the next circulation pump 13 is set.

In the cooling device for a fuel cell vehicle according to one embodiment configured as described above, a single pump drive motor 20 is driven by the drive unit 8 so that the primary circulation pump 11 and the secondary circulation pump 11 are driven. The pump 13 is driven at a predetermined same rotation speed at a predetermined flow rate ratio, the primary coolant circulates in the primary circulation channel 12 at a predetermined flow ratio, and the secondary coolant circulates in the main circulation channel 14. Circulate in the circulation channel 14A and the sub-circulation channel 14B.

Here, when the temperature of the primary cooling liquid passing through the thermostat valve 17 of the primary circulation channel 12 is lower than 85 ° C. in the cold state of the fuel cell 1, the thermostat valve 17 is connected to the first heat exchanger. In order to close the flow path on the outlet side of 15, the primary cooling liquid flows from the primary circulation pump 11 to the primary circulation pump 11 via the cooling liquid flow path C 12, the bypass flow path 12 A, and the thermostat valve 17 of the fuel cell 1. And circulate. Then, 1 circulates around the first heat exchanger 15.
The secondary coolant absorbs heat while passing through the coolant channel C12 of the fuel cell 1 and gradually rises in temperature, thereby warming up the fuel cell 1. In this case, since the primary circulation flow path 12 has a reduced pipe length and the amount of circulating primary coolant is small, the temperature of the primary coolant rises to around 85 ° C. in a short time. Therefore, the warm-up of the fuel cell 1 is completed quickly.

When the temperature of the primary coolant passing through the thermostat valve 17 of the primary circulation channel 12 reaches 85 ° C. and the warming up of the fuel cell 1 is completed, the thermostat valve 17
Opens the flow path on the outlet side of the first heat exchanger 15, the primary coolant flows from the primary circulation pump 11 to the coolant flow path C 12 of the fuel cell 1, the first heat exchanger 15, the thermostat valve 1
The primary circulation pump 11 circulates through the primary circulation flow path 12 to the primary circulation pump 11. The primary coolant circulating through the first heat exchanger 15 absorbs heat in the process of passing through the coolant passage C12 of the fuel cell 1 to cool the fuel cell 1, and the first heat exchanger 15 As a result, heat is exchanged with the secondary coolant in the secondary circulation channel 14 to radiate heat. Thus, the temperature of the primary coolant is maintained at about 85 ° C. on the inlet side of the first heat exchanger 15,
5 is maintained at about 75 ° C. at the outlet side.

On the other hand, the secondary coolant is supplied to the secondary circulation pump 13
From the first heat exchanger 15 to the intercooler 3
D. Circulate the main circulation flow path 14A to the secondary circulation pump 13 via the second heat exchanger 16. The secondary coolant circulating in the main circulation channel 14A exchanges heat with the primary coolant in the primary circulation channel 12 in the course of passing through the first heat exchanger 15 and absorbs heat, thereby absorbing the intercooler 3D. During the passage through the second heat exchanger 16, heat is exchanged with the air compressed and heated by the supercharger 3 </ b> C of the air supply system 3 to absorb heat. Exchanges heat with heat to dissipate heat.

On the other hand, the secondary coolant is diverted from the secondary circulation pump 13 to the third heat exchanger 21 side, and the traveling motor 2, the drive motor 3E of the supercharger 3C, the drive unit 8, the output current The control device 6 circulates the sub-circulation flow path 14 </ b> B to the secondary circulation pump 13 via the second heat exchanger 16. The secondary coolant circulating in the sub-circulation flow path 14B is:
In the process of passing through the third heat exchanger 21, the electric cooling fan 22
Heat is exchanged with the outside air by the air blow by
, A water jacket (not shown) of the drive motor 3E, a water jacket (not shown) of the drive unit 8 and a water jacket (not shown) formed on the heat sink of the output current control device 6. In the process, they cool and absorb heat, and in the process of joining and passing through the second heat exchanger 16, they exchange heat with the outside air by the traveling wind or the blow of the electric cooling fan 19 to radiate heat.

Thus, the temperature of the secondary coolant is about 65 ° C. on the inlet side of the first heat exchanger 15 and 75 ° C. on the outlet side thereof.
About 75 ° C. on the inlet side of the second heat exchanger 16 and about 65 ° C. on the outlet side thereof. The temperature of the secondary coolant is 6 at the inlet side of the third heat exchanger 21.
It is maintained at about 5 ° C. and at about 60 ° C. on the outlet side.

Therefore, according to the cooling device for a fuel cell vehicle of one embodiment, the fuel cell 1 is cooled by the primary coolant radiated by the first heat exchanger 15 and is maintained at an appropriate temperature range of 75 to 85 ° C. can do. Further, the heat generation source including the traveling motor 2, the drive motor 3E of the supercharger 3C, the drive unit 8 and the output current control device 6 is dissipated by the second heat exchanger 16 and the third heat exchanger 21 It can be efficiently cooled by the cooling liquid and maintained in an appropriate temperature range.

On the other hand, the cooling device for a fuel cell vehicle according to one embodiment includes a first heat exchanger 15 as a radiator for a primary cooling liquid for cooling the fuel cell 1, and includes a motor 2 for traveling and a supercharger 3C. Since the second heat exchanger 16 and the third heat exchanger 21 are provided as a radiator of the secondary coolant for cooling the heat generation source including the drive motor 3E, the drive unit 8 and the output current controller 6, the radiator is provided. It is possible to avoid an increase in the size of the cooling device due to an increase in the size of the cooling device. Further, the first heat exchanger 15 is configured to exchange heat between the primary coolant in the primary circulation channel 12 and the secondary coolant in the secondary circulation channel 14. In addition, it is possible to avoid redundancy of the cooling device.

The primary circulating pump 11 for circulating the primary coolant and the secondary circulating pump 13 for circulating the secondary coolant are a single pump drive motor having rotating shafts 20A, 20A protruding on both sides. 20 is also rotatably connected to both sides thereof, so that the configuration of the cooling device is further simplified. In this case, the fuel cell 1 can be cooled to an appropriate temperature range by the primary coolant cooled by the secondary coolant by the simple control of controlling the operation of the single pump drive motor 20. . Further, the heat generation source including the traveling motor 2, the drive motor 3E, the drive unit 8, and the output current control device 6 can be cooled independently of the fuel cell 1 by the secondary coolant.

In the fuel cell vehicle cooling device according to one embodiment, the first heat exchanger 15 is disposed near the fuel cell 1.
Is arranged, the length of the conduit of the primary circulation channel 12 is shortened. For this reason, the amount of the primary coolant for cooling or warming up the fuel cell 1 is reduced, and when the fuel cell 1 is warmed up, the temperature of the primary coolant rises in a short time to shorten the warm-up time. be able to.

The bypass passage 12A and the communication passage 1
Since the primary circulation flow path 12 containing 2B is made of an appropriate material from which ions are hardly eluted, for example, an insulating material such as a stainless steel pipe or a synthetic resin pipe, the electric conductivity is maintained low as the primary coolant. By using pure water, LLC or insulating oil, the liquid junction phenomenon of the fuel cell 1 can be prevented. In this case, since the LLC or insulating oil has a low freezing point, the function of the cooling device is not impaired even in a cold region.

[0040]

As described above, in the cooling device for a fuel cell vehicle according to the present invention, the primary coolant is circulated through the primary circulation channel by the operation of the primary circulation pump and the secondary circulation pump. The secondary coolant circulates through the main circulation passage and the sub circulation passage of the secondary circulation passage. The primary coolant circulating in the primary circulation channel cools the fuel cell and absorbs heat, and exchanges heat with the secondary coolant by the first heat exchanger to radiate heat. On the other hand, 2 which circulates through the main circulation passage of the secondary circulation passage
The secondary coolant exchanges heat with the primary coolant in the first heat exchanger and absorbs heat, and exchanges heat with the outside air and dissipates heat in the second heat exchanger. The secondary coolant circulating in the sub-circulation passage of the secondary circulation passage exchanges heat with the outside air in the third heat exchanger to radiate heat, cools a heat generation source including the traveling motor, and absorbs heat. The second heat exchanger exchanges heat with the outside air and radiates heat.

That is, according to the cooling device for a fuel cell vehicle of the present invention, the fuel cell can be maintained in an appropriate temperature range by cooling the fuel cell with the primary cooling liquid radiated by the first heat exchanger. The heat source can be efficiently cooled by the secondary coolant radiated by the second heat exchanger and the third heat exchanger, and can be maintained in an appropriate temperature range.

On the other hand, the cooling device for a fuel cell vehicle according to the present invention includes a first heat exchanger as a primary cooling liquid radiator for cooling the fuel cell, and a secondary cooling device for cooling a heat generating source including a traveling motor. Since the second heat exchanger and the third heat exchanger are provided as the cooling liquid heat radiating device, it is possible to avoid an increase in the size of the cooling device due to an increase in the size of the heat radiating device. Further, the first heat exchanger is configured to exchange heat between the primary coolant in the primary circulation channel and the secondary coolant in the secondary circulation channel. Redundancy can be avoided.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a cooling device for a fuel cell vehicle according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing a cell structure of the fuel cell shown in FIG.

FIG. 3 is a cross-sectional view showing a connection state of a primary circulation pump and a secondary circulation pump to the pump drive motor shown in FIG.

4 is a front view of an impeller portion of the primary circulation pump and the secondary circulation pump shown in FIG. 3, (a) is a front view of an impeller portion of the primary circulation pump, and (b) is a secondary circulation. It is a front view of the impeller part of a pump.

[Explanation of symbols]

 1: Fuel cell (FC) 2: Running motor (EVM) 6: Output current control device (DC / DC) 8: Drive unit (PDU) 11: Primary circulation pump 12: Primary circulation flow path 13: Secondary Circulation pump 14: Secondary circulation channel 15: First heat exchanger 16: Second heat exchanger 17: Thermostat valve 19: Electric cooling fan 20: Pump drive motor 21: Third heat exchanger 22: Electric cooling fan

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01M 8/04 H01M 8/04 T // H01M 8/10 8/10 (72) Inventor Takeshi Ushio Saitama 1-4-1, Chuo, Wako-shi, Honda Technical Research Institute, Inc. (72) Inventor Mamoru Yoshikawa 1-4-1, Chuo, Wako-shi, Saitama F-term, Honda Technical Research Institute, Inc. 3D035 AA03 3D038 AA00 AB00 AC00 5H026 AA06 5H027 AA06 CC06 DD03 5H115 PA08 PC06 PG04 PI14 PI16 PI18 PI29 PI30 PU01 PV02 QA10 SE03 SE06 TO05 TR04 TR19 TU12 UI30 UI35 UI40

Claims (1)

[Claims] 1. A cooling device for a fuel cell vehicle in which a fuel cell is mounted as a power supply for a traveling motor, wherein the fuel cell is cooled by a primary coolant circulated by a primary circulation pump. A primary circulation channel, a secondary circulation channel configured to be capable of cooling a heat generation source including the traveling motor by a secondary coolant circulated by a secondary circulation pump, and a primary circulation channel. A first heat exchanger for exchanging heat between the primary coolant and the secondary coolant in the secondary circulation flow path;
A second heat exchanger and a third heat exchanger for exchanging heat between the secondary coolant in the secondary circulation channel and the outside air, wherein the secondary circulation channel is A main circulation passage returning to the secondary circulation pump via the first heat exchanger and the second heat exchanger, a heat generation source including the third heat exchanger, the traveling motor, and the second heat from the secondary circulation pump A cooling device for a fuel cell vehicle, comprising: a sub-circulation flow path returning to a secondary circulation pump via an exchanger.