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Vehicle fuel cell cooling system

A fuel cell and cooling system technology, applied in the direction of fuel cells, fuel cell additives, fuel cell heat exchange, etc., can solve problems such as excessive moisture, easy drying of fuel cell membranes, difficulty in maintaining a wet state in an appropriate range, etc. , to achieve the effect of preventing liquid flooding

Active Publication Date: 2013-05-29
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the saturated vapor pressure changes due to changes in the outside air pressure between when the vehicle is driven on a high terrain and when it is driven on a low terrain, so the fuel cell membrane tends to dry out at high terrain
On the other hand, fuel cell membranes tend to become over-moisturized at low elevations
Therefore, when the temperature of the coolant supplied to the fuel cell is controlled only by the operation of the temperature control valve, it may be difficult to maintain the wet state of the membrane of the fuel cell within an appropriate range.

Method used

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  • Vehicle fuel cell cooling system
  • Vehicle fuel cell cooling system
  • Vehicle fuel cell cooling system

Examples

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no. 1 Embodiment approach

[0022] figure 1 A configuration example of a vehicle fuel cell cooling system to which the present invention is applied is shown in FIG. This fuel cell cooling system for a vehicle is used to adjust the temperature of the fuel cell stack 1 by circulating and supplying cooling fluid to the fuel cell stack 1 installed as a power source of the fuel cell vehicle.

[0023] The fuel cell stack 1 is constituted by combining a plurality of power generation unit layers into a plurality of nodes. Each power generation unit constituting the fuel cell stack 1 has, for example, a structure in which a membrane-electrode assembly, which is a fuel electrode that receives a supply of fuel gas, is disposed opposite to each other with a solid polymer electrolyte membrane interposed therebetween. It is composed of an oxidant electrode that receives the supply of oxidant gas. The separator of this power generation unit is provided with a fuel gas flow channel through which the fuel gas flows on ...

no. 2 Embodiment approach

[0047] Next, a second embodiment of the present invention will be described. This embodiment is a modified example of the above-mentioned first embodiment, on the premise that the operation pressure of the fuel cell stack 1 is lowered to a range in which dehydration does not occur at a high place, and compared with the first embodiment, , set the operating temperature of the temperature control valve 8 higher. In addition, the outline of the configuration and control of the system is the same as that of the first embodiment, so only the characteristic parts will be described below in this embodiment, and the description that overlaps with that of the first embodiment will be omitted.

[0048]As the driving environment of the fuel cell vehicle, it is generally considered that there are more cases of driving on low terrain than on high terrain. When it is required to operate the electric heater 10 when driving on low terrain, the power consumption increases. Therefore, in the ...

no. 3 Embodiment approach

[0057] Next, a third embodiment of the present invention will be described. In this embodiment, as the temperature control valve 8, a valve that operates to maintain the wet state of the solid polymer electrolyte membrane of the fuel cell stack 1 in an appropriate range at a low-lying place is used. When the temperature of the cooling liquid supplied by the battery stack 1 is too high and people are worried about dehydration, the operation of the electric heater 10 heats the cooling liquid flowing into the temperature control valve 8, so that the temperature control valve 8 is forcibly operated. The flow path of the coolant is switched to the side of the radiator 5 to lower the temperature of the coolant supplied to the fuel cell stack 1 , thereby preventing dehydration.

[0058] Figure 8 It is a block diagram of the vehicle fuel cell cooling system of this embodiment. Such as Figure 8 As shown, in the vehicle fuel cell cooling system of this embodiment, the electric heat...

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Abstract

A system includes a radiator side flow path (9) for supplying a coolant which has cooled a fuel cell stack (1) to a radiator (5), a bypass flow path (7) for allowing the coolant which has cooled the fuel cell stack (1) to bypass the radiator (5), a thermostat valve (8) for increasing a flow rate of the coolant flowing through the radiator side flow path (9) in a case where the temperature of the coolant is high as compared to a case where the temperature of the coolant is low, and an electric heater (10) for warming up the coolant. The electric heater (10) is controlled based on an outside atmospheric pressure and on the temperature of the coolant such that the temperature of the coolant flowing into the fuel cell stack (1) is raised in a case where the outside atmospheric pressure is high as compared to a case where the outside atmospheric pressure is low.

Description

technical field [0001] The present invention relates to a fuel cell cooling system for a vehicle that circulates and supplies coolant to a fuel cell mounted on a vehicle to adjust the temperature of the fuel cell. Background technique [0002] Conventionally, a fuel cell cooling system for a vehicle described in Patent Document 1 is known as a fuel cell cooling system for a vehicle that circulates and supplies a coolant to a fuel cell mounted on a vehicle to adjust the temperature of the fuel cell. The fuel cell cooling system for a vehicle includes a radiator that cools coolant by radiating heat, a coolant circulation circuit that circulates the coolant between the fuel cell and the radiator, a bypass passage that makes the coolant flow around the radiator, and The temperature control valve that switches the coolant flow to either the radiator or the bypass channel according to the temperature of the coolant. The temperature of the coolant supplied to the fuel cell is contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18H01M8/00H01M8/04
CPCY02T90/32B60L11/1892H01M8/04037H01M8/04529H01M8/04029B60L11/1883H01M8/04723H01M8/04358H01M8/04731H01M8/04268H01M8/04955H01M2250/20H01M8/0438H01M8/04768H01M8/04253Y02E60/50Y02T90/34B60L50/72B60L58/33H01M8/04007H01M8/04126H01M8/0485Y02T90/40
Inventor 竹本真一郎若林计介长田贵仁
Owner NISSAN MOTOR CO LTD
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