Cooling method of automobile fuel cell

Abstract

The invention discloses a cooling method of an automobile fuel cell, which comprises the following steps: S1, at the initial running stage of the automobile fuel cell, a natural cooling mode is adopted, and heat exchange between a fuel cell shell and ambient air is utilized; s2, when the temperature of the fuel cell rises to a first preset temperature, starting an air cooling mode, and blowing external cold air to the fuel cell through a fan; s3, when the temperature of the fuel cell rises to a second preset temperature, cooling liquid is introduced for circulating cooling, and the cooling liquid flows in a cooling channel in the fuel cell; s4, after flowing out of the fuel cell, the cooling liquid exchanges heat with an external cooling medium through a heat exchanger; s5, the cooled cooling liquid circularly enters the fuel cell again; according to the heat dissipation and cooling method for the automobile fuel cell, different cooling media and cooling modes are combined in a specific cooling process, so that the automobile fuel cell is efficiently cooled, the fuel cell is kept in a proper temperature range in the working process, the performance of the fuel cell is improved, and the service life of the fuel cell is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of automobile fuel cells, and in particular to a cooling method for automobile fuel cells. Background Art

[0002] With the improvement of environmental awareness and the intensification of energy crisis, automotive fuel cells, as an efficient and clean energy conversion device, have received more and more attention. However, automotive fuel cells generate a lot of heat during operation. If the heat cannot be dissipated and cooled in time and effectively, the performance and life of the fuel cell will be affected. Therefore, it is of great practical significance to study an efficient method for heat dissipation and cooling of automotive fuel cells. Summary of the invention

[0003] In order to solve the above technical problems, a cooling method for an automobile fuel cell is provided.

[0004] To achieve the above objectives, the following solutions are provided: A method for cooling a fuel cell of an automobile comprises the following steps: S1. In the initial stage of operation of the automotive fuel cell, natural cooling is used to perform preliminary cooling by heat exchange between the fuel cell housing and the surrounding air; S2. When the temperature of the fuel cell rises to the first preset temperature, the air cooling mode is started, and the external cold air is blown to the fuel cell by the fan to accelerate the heat dissipation; S3. When the temperature of the fuel cell continues to rise to the second preset temperature, a coolant circulation cooling is introduced, and the coolant flows in the cooling channel inside the fuel cell to take away the heat; S4. After the coolant flows out of the fuel cell, it exchanges heat with the external cooling medium through the heat exchanger to reduce the coolant temperature; S5. The cooled coolant circulates into the fuel cell again to continue cooling.

[0005] Furthermore, the first preset temperature is 40°C to 50°C.

[0006] Furthermore, the second preset temperature is 60°C to 70°C.

[0007] Furthermore, the coolant is deionized water or a dedicated fuel cell coolant.

[0008] Furthermore, the external cooling medium is air or water.

[0009] Furthermore, during the cooling process of the coolant circulation, the flow rate of the coolant is adjusted in real time by monitoring the temperature of the fuel cell.

[0010] Furthermore, when the temperature of the fuel cell increases, the flow rate of the coolant is increased; and when the temperature of the fuel cell decreases, the flow rate of the coolant is decreased.

[0011] Furthermore, in the air cooling method, the rotation speed of the fan is adjusted according to the temperature of the fuel cell.

[0012] Furthermore, when the temperature of the fuel cell increases, the fan speed is increased; and when the temperature of the fuel cell decreases, the fan speed is decreased.

[0013] The working principle and advantages of the present invention are: the automobile fuel cell heat dissipation and cooling method realizes efficient cooling of the automobile fuel cell by combining different cooling media and cooling methods in a specific cooling process, ensures that the fuel cell remains within a suitable temperature range during operation, improves the performance and life of the fuel cell, and meets the user's usage needs. DETAILED DESCRIPTION

[0014] The following is a further detailed description through specific implementation methods: Embodiment 1

[0015] After the car is started, the fuel cell starts to operate. In the initial stage, since the fuel cell generates less heat, natural cooling is used to allow the fuel cell housing to exchange heat with the surrounding air to achieve initial cooling. When the temperature sensor detects that the temperature of the fuel cell rises to 45°C, the air cooling method is started. The fan starts to work and blows external cold air to the fuel cell to accelerate the heat dissipation. As the fuel cell continues to operate, the temperature may continue to rise. When the temperature reaches 65°C, coolant circulation cooling is introduced. The coolant is deionized water, which flows in the cooling channel inside the fuel cell and takes away the heat. The coolant flowing out of the fuel cell enters the heat exchanger, exchanges heat with the external air, and reduces the coolant temperature. The cooled coolant circulates into the fuel cell again and continues to cool. During the coolant circulation cooling process, the coolant flow rate is adjusted according to the fuel cell temperature monitored in real time by the temperature sensor. When the temperature rises, the coolant flow rate is increased; when the temperature drops, the coolant flow rate is reduced. At the same time, in the air cooling method, the fan speed is adjusted according to the temperature of the fuel cell. When the temperature rises, the fan speed is increased; when the temperature drops, the fan speed is reduced. Embodiment 2

[0016] Similar to the first embodiment, after the car is started, the fuel cell starts to operate. The natural cooling stage is the same. When the temperature of the fuel cell rises to 48°C, the air cooling method is started. When the temperature reaches 68°C, the coolant circulation cooling is introduced. The coolant is a dedicated fuel cell coolant. The coolant flowing out of the fuel cell enters the heat exchanger, exchanges heat with external water, and reduces the coolant temperature. During the coolant circulation cooling and air cooling process, the coolant flow rate and fan speed are also adjusted in real time according to the temperature of the fuel cell.

[0017] It can be seen from the above embodiments that the automobile fuel cell cooling method of the present invention can adopt different cooling methods in a timely manner according to the temperature changes of the fuel cell, and reasonably adjust the cooling parameters, thereby effectively realizing the cooling of the automobile fuel cell, ensuring that the fuel cell remains within a suitable temperature range during operation, and improving the performance and life of the fuel cell.

[0018] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, which will not affect the effect of the implementation of the present invention and the applicability of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A cooling method for an automobile fuel cell, characterized in that: The following steps are involved: S1. In the initial stage of operation of the automotive fuel cell, natural cooling is used to perform preliminary cooling by heat exchange between the fuel cell housing and the surrounding air; S2. When the temperature of the fuel cell rises to the first preset temperature, the air cooling mode is started, and the external cold air is blown to the fuel cell by the fan to accelerate the heat dissipation; S3. When the temperature of the fuel cell continues to rise to the second preset temperature, a coolant circulation cooling is introduced, and the coolant flows in the cooling channel inside the fuel cell to take away the heat; S4. After the coolant flows out of the fuel cell, it exchanges heat with the external cooling medium through the heat exchanger to reduce the coolant temperature; S5. The cooled coolant circulates into the fuel cell again to continue cooling.

2. The method for cooling a fuel cell for an automobile according to claim 1, characterized in that: The first preset temperature is 40°C to 50°C.

3. The cooling method for a fuel cell for an automobile according to claim 1, characterized in that: The second preset temperature is 60°C to 70°C.

4. The method for cooling a fuel cell for an automobile according to claim 1, characterized in that: The coolant is deionized water or a dedicated fuel cell coolant.

5. The method for cooling a fuel cell for an automobile according to claim 1, characterized in that: The external cooling medium is air or water.

6. The method for cooling a fuel cell for an automobile according to claim 1, characterized in that: During the coolant circulation cooling process, the flow rate of the coolant is adjusted in real time by monitoring the temperature of the fuel cell.

7. The method for cooling a fuel cell for an automobile according to claim 6, characterized in that: When the temperature of the fuel cell increases, the coolant flow rate is increased; when the temperature of the fuel cell decreases, the coolant flow rate is reduced.

8. The method for cooling a fuel cell for an automobile according to claim 1, characterized in that: In the air cooling method, the speed of the fan is adjusted according to the temperature of the fuel cell.

9. The method for cooling a fuel cell for an automobile according to claim 8, characterized in that: When the temperature of the fuel cell increases, the fan speed is increased; when the temperature of the fuel cell decreases, the fan speed is decreased.