A battery cooling system and an electric truck

Abstract

This invention relates to a battery cooling system and an electric truck. The battery cooling system includes a water circulation pipeline and a water pump, as well as a first cooling fan module and a second cooling fan module. Both the first and second cooling fan modules include a fan and a radiator. The battery cooling system also includes a controller and a temperature sensor. The controller controls the operation of at least one of the first and second cooling fan modules as follows: when the battery temperature is less than or equal to A1, the controller controls the fan of the first cooling fan module to turn on and the fan of the second cooling fan module to turn off; when the battery temperature is greater than A1, the controller controls the fan of the second cooling fan module to turn on and the fan of the first cooling fan module to turn off. The first and second cooling fan modules of the battery cooling system of this invention are separately arranged, resulting in a smaller size and a greater distance from the ground, thus improving the vehicle's maneuverability.

Description

Technical Field

[0001] This invention relates to a battery cooling system and an electric truck, belonging to the field of battery cooling. Background Technology

[0002] In recent years, the development of electric trucks has been rapid. Electric trucks typically use fuel cells as their power source, with the fuel cell mounted on the truck's frame, which also houses a cooling system for the fuel cell. This cooling system includes water circulation piping, a water pump installed on the piping, and a cooling fan module for cooling the coolant in the piping. The cooling fan module consists of a radiator and a fan, and is usually located on the frame below the cab. Because existing cooling fan modules are relatively large and close to the ground, electric trucks have poor maneuverability, and the cooling fan modules are easily damaged by scraping against the ground. Summary of the Invention

[0003] The purpose of this invention is to provide a battery cooling system that solves the problems of existing cooling fans being too large, resulting in poor vehicle passability and the cooling fan module being easily damaged by scraping against the ground. This invention also provides an electric truck incorporating the above-mentioned battery cooling system.

[0004] The technical solution of the battery heat dissipation system of the present invention is as follows:

[0005] The battery cooling system includes a water circulation pipeline for cooling the battery and a water pump installed on the water circulation pipeline. The system also includes a first cooling fan module and a second cooling fan module for cooling the coolant in the water circulation pipeline. The water circulation pipeline includes a first branch and a second branch. The first cooling fan module is installed on the first branch, and the second cooling fan module is installed on the second branch. Both the first and second cooling fan modules include a fan and a radiator. The cooling rate of the coolant in the water circulation pipeline by the first cooling fan module is less than that by the second cooling fan module. The battery cooling system also includes a controller and a temperature sensor for monitoring the battery temperature. The controller can control the on / off state of the fans of the first and second cooling fan modules based on the temperature signal from the temperature sensor. When the controller controls at least one of the fans of the first and second cooling fan modules to be on, the control method is as follows: when the battery temperature is less than or equal to A1, the controller controls the fan of the first cooling fan module to be on and the fan of the second cooling fan module to be off; when the battery temperature is greater than A1, the controller controls the fan of the second cooling fan module to be on and the fan of the first cooling fan module to be off.

[0006] Beneficial effects: The battery cooling system of the present invention includes a first cooling fan module and a second cooling fan module. The first and second cooling fan modules are separately configured, resulting in a smaller size compared to existing integrated cooling fan modules. Furthermore, their greater distance from the ground improves vehicle passability and reduces the risk of damage from friction with the ground. Additionally, the controller regulates the activation and deactivation of the first and second cooling fan modules based on battery temperature, enabling efficient energy allocation and energy conservation.

[0007] Furthermore, when the battery temperature is greater than A1 and less than A2, the controller controls the fan of the second cooling fan module to turn on and the fan of the first cooling fan module to turn off. When the battery temperature is greater than or equal to A2, the controller controls the fans of the first cooling fan module and the second cooling fan module to turn on.

[0008] Beneficial effects: This control scheme enables the fans of both cooling fan modules to start simultaneously when the battery temperature is too high, which can improve the heat dissipation efficiency of the coolant, thereby improving the heat dissipation efficiency of the battery.

[0009] Furthermore, the second cooling fan module has at least two fans.

[0010] Beneficial effects: By increasing the number of fans, the cooling efficiency of the second cooling fan module for the coolant is increased, which is simple and convenient.

[0011] Furthermore, the water circulation pipeline is equipped with a liquid circuit control valve that controls the opening and closing of the first branch and the second branch. The controller is connected to the liquid circuit control valve. When the controller controls the fan of the first cooling fan module to turn off, it simultaneously controls the liquid circuit control valve to close the first branch. When the control valve controls the fan of the second cooling fan module to turn off, it simultaneously controls the liquid circuit control valve to close the second branch.

[0012] Beneficial effects: The control method of simultaneously shutting down the fan of the cooling fan module and the branch of the water circulation pipeline where the cooling fan module is located saves energy.

[0013] The technical solution for the electric truck of this invention is:

[0014] The electric truck includes a frame, a battery mounted on the frame as a power source, and a battery cooling system for dissipating heat from the battery. The battery cooling system includes water circulation pipes for cooling the battery and a water pump installed on the water circulation pipes. The battery cooling system also includes a first cooling fan module and a second cooling fan module for cooling the coolant in the water circulation pipes. The water circulation pipes include a first branch and a second branch. The first cooling fan module is located on the first branch, and the second cooling fan module is located on the second branch. Both the first and second cooling fan modules include a fan and a radiator, and the cooling rate of the coolant in the water circulation pipes by the first cooling fan module is less than that of the second cooling fan module. The cooling fan module dissipates heat from the coolant in the water circulation pipe at a certain speed. The battery cooling system also includes a controller and a temperature sensor for monitoring the battery temperature. The controller can control the opening and closing of the fan of the first cooling fan module and the fan of the second cooling fan module based on the temperature signal from the temperature sensor. The control method when the controller controls at least one of the fans of the first cooling fan module and the second cooling fan module to be turned on is as follows: when the battery temperature is less than or equal to A1, the controller controls the fan of the first cooling fan module to be turned on and the fan of the second cooling fan module to be turned off; when the battery temperature is greater than A1, the controller controls the fan of the second cooling fan module to be turned on and the fan of the first cooling fan module to be turned off.

[0015] Beneficial effects: The battery cooling system for the electric truck of the present invention includes a first cooling fan module and a second cooling fan module. The first and second cooling fan modules are separately configured, resulting in a smaller size compared to existing integrated cooling fan modules. Furthermore, their greater distance from the ground improves vehicle passability and reduces the risk of damage from friction with the ground. Additionally, the controller manages the activation and deactivation of the first and second cooling fan modules based on battery temperature, enabling efficient energy allocation and energy conservation.

[0016] Furthermore, when the battery temperature is greater than A1 and less than A2, the controller controls the fan of the second cooling fan module to turn on and the fan of the first cooling fan module to turn off. When the battery temperature is greater than or equal to A2, the controller controls the fans of the first cooling fan module and the second cooling fan module to turn on.

[0017] Beneficial effects: This control scheme enables the fans of both cooling fan modules to start simultaneously when the battery temperature is too high, which can improve the heat dissipation efficiency of the coolant, thereby improving the heat dissipation efficiency of the battery.

[0018] Furthermore, the second cooling fan module has at least two fans.

[0019] Beneficial effects: By increasing the number of fans, the cooling efficiency of the second cooling fan module for the coolant is increased, which is simple and convenient.

[0020] Furthermore, the water circulation pipeline is equipped with a liquid circuit control valve that controls the opening and closing of the first branch and the second branch. The controller is connected to the liquid circuit control valve. When the controller controls the fan of the first cooling fan module to turn off, it simultaneously controls the liquid circuit control valve to close the first branch. When the control valve controls the fan of the second cooling fan module to turn off, it simultaneously controls the liquid circuit control valve to close the second branch.

[0021] Beneficial effects: The control method of simultaneously shutting down the fan of the cooling fan module and the branch of the water circulation pipeline where the cooling fan module is located saves energy.

[0022] Furthermore, the battery includes a fuel cell and a storage battery, with the storage battery located behind the fuel cell. The battery uses a cooling system to dissipate heat from the fuel cell. The fuel cell is located at the front of the vehicle frame, and a second cooling fan module is located at the front of the fuel cell.

[0023] Beneficial effects: This arrangement of the second cooling fan module allows it to be closer to the fuel cell, with a shorter water circulation pipeline, making installation and layout more convenient.

[0024] Furthermore, the frame includes two longitudinal beams extending front and rear and crossbeams extending left and right, with the two longitudinal beams spaced apart. The second cooling fan module is located between the two longitudinal beams and is fixed to both the two longitudinal beams and the crossbeams.

[0025] Beneficial effect: The second fan module is fixed to both longitudinal beams and cross beams simultaneously, resulting in a good fixing effect.

[0026] Furthermore, the first cooling fan module and the second cooling fan module are arranged side by side, and the first cooling fan module is located between the footrest and the longitudinal beam of the electric truck's cab.

[0027] Beneficial effects: This arrangement makes the overall structure of the heat dissipation system more compact.

[0028] Furthermore, a front bracket and a rear bracket are provided on the outer side of the longitudinal beam, and the front bracket and the rear bracket are spaced apart along the extension direction of the longitudinal beam. The first cooling fan module is suspended on the outer side of the longitudinal beam through the front bracket and the rear bracket.

[0029] Beneficial effects: The first cooling fan module is installed on the outside of the longitudinal beam via the front and rear brackets, which is simple in structure and easy to install.

[0030] Furthermore, the battery includes a fuel cell and a storage battery, with the storage battery located behind the fuel cell. The battery uses a cooling system to dissipate heat from the fuel cell. The fuel cell is located at the front of the vehicle frame, and a first cooling fan module is located at the front of the fuel cell.

[0031] Beneficial effects: This arrangement of the first cooling fan module makes it closer to the fuel cell, the water circulation pipeline shorter, and the installation more convenient. Attached Figure Description

[0032] Figure 1 This is a top view of embodiment 1 of the electric truck of the present invention;

[0033] Figure 2 This is a front view of the electric truck embodiment 1 of the present invention;

[0034] Figure 3 yes Figure 2 The left view;

[0035] Figure 4 This is a schematic diagram of the structure of the first cooling fan module in Embodiment 1 of the electric truck of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the second cooling fan module in Embodiment 1 of the electric truck of the present invention;

[0037] Figure 6 yes Figure 5 The main view;

[0038] Figure 7 This is a control block diagram of the battery cooling system in Embodiment 1 of the electric truck of the present invention;

[0039] Figure 8 This is a schematic diagram of the battery cooling system in Embodiment 1 of the electric truck of the present invention.

[0040] Explanation of reference numerals in the attached drawings: 1. Frame; 101. Longitudinal beam; 102. Crossbeam; 2. Water circulation pipeline; 201. Main pipeline; 202. First branch pipeline; 203. Second branch pipeline; 3. Water pump; 4. First cooling fan module; 5. Second cooling fan module; 6. Filter; 7. Three-way valve; 8. Expansion tank; 9. Left bracket; 10. Right bracket; 11. Foot pedal; 12. Front bracket; 13. Rear bracket; 14. Fuel cell; 15. Fan; 16. Radiator. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] It should be noted that, in specific embodiments of the present invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply such an actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising a…" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the body, or it can be separately arranged from the body and connected to the body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0046] The present invention will be further described in detail below with reference to the embodiments.

[0047] Embodiment 1 of the electric truck provided in this invention:

[0048] like Figures 1 to 8As shown, the electric truck includes a frame 1, a battery mounted on the frame 1 as the power source for the electric truck, and a battery cooling system for dissipating heat from the battery. In this embodiment, the battery includes a fuel cell 14 and a storage battery. The fuel cell 14 is arranged at the front of the frame 1, and the storage battery is located at the rear of the fuel cell 14. The battery cooling system is used to dissipate heat from the fuel cell 14, and the battery cooling system is an external cooling system for the fuel cell 14.

[0049] The battery cooling system includes a water circulation pipe 2 and a water pump 3 installed on the water circulation pipe 2. The water pump 3 serves as the power source for the circulation of coolant in the water circulation pipe 2. When the flowing coolant passes through the fuel cell 14, it carries away the heat of the fuel cell 14 to cool the fuel cell 14.

[0050] To enhance the heat dissipation efficiency of the battery cooling system, the system further includes a first cooling fan module 4 and a second cooling fan module 5 for cooling the coolant in the water circulation pipe 2. The water circulation pipe 2 includes a main pipe 201, a first branch pipe 202, and a second branch pipe 203. The first cooling fan module 4 is disposed on the first branch pipe 202, and the second cooling fan module 5 is disposed on the second branch pipe 203. Both the first cooling fan module 4 and the second cooling fan module 5 include a radiator 16 and a fan 15. The radiator 16 is connected to the water circulation pipe 2 to dissipate heat and cool the coolant flowing through it. The fan 15 blows air onto the radiator 16 to improve its heat dissipation efficiency. Specifically, the cooling rate of the coolant in the water circulation pipe 2 by the first cooling fan module 4 is less than the cooling rate of the coolant in the water circulation pipe 2 by the second cooling fan module 5.

[0051] A filter 6 for filtering coolant is provided on the main pipe 201 of the water circulation pipeline 2. A liquid circuit control valve is also provided to connect the main pipe 201, the first branch 202 and the second branch 203. In this embodiment, the liquid circuit control valve is a three-way valve 7. The three-way valve 7 is provided to facilitate the opening and closing of the main pipe 201, the first branch 202 and the second branch 203.

[0052] In addition, an expansion tank 8 is provided on the water circulation pipeline 2. The expansion tank 8 is a common structure in the prior art, and its structure and function will not be described in detail here.

[0053] To facilitate control of the activation and deactivation of the first cooling fan module 4 and the second cooling fan module 5, the battery cooling system also includes a controller and a temperature sensor for monitoring the temperature of the fuel cell 14. It should be noted that the fuel cell 14 has its own internal circulating cooling system for regulating battery temperature. When the temperature of the fuel cell 14 has not reached the upper limit of the regulation of the internal circulating cooling system, the battery cooling system does not operate, and the temperature of the fuel cell 14 is regulated by the internal circulating cooling system. Of course, in the absence of an internal circulating cooling system for the fuel cell 14, the controller can also stop the battery cooling system from operating when the ambient temperature is low, depending on changes in the external environment.

[0054] The control principle of the heat dissipation system for the battery of the electric truck of the present invention is as follows:

[0055] A temperature sensor collects the temperature signal of the fuel cell 14. When the temperature of the fuel cell 14 is lower than the upper limit of the internal cooling system, the temperature of the fuel cell 14 is regulated by its own internal cooling system. At this time, the controller of the cooling system controls the fans 15 of the first cooling fan module 4 and the second cooling fan module 5 to turn off, and controls the three-way valve 7 to close the first branch 202 and the second branch 203. When the temperature of the fuel cell 14 is higher than the upper limit of the internal cooling system and less than or equal to A1, the controller controls the three-way valve 7 to open the first branch 202 and close the second branch 203, and controls the fans 15 of the first cooling fan module 4 to turn on and the fans 15 of the second cooling fan module 5 to turn off. When the temperature of fuel cell 14 is greater than A1 and less than A2, the controller controls the three-way valve 7 to open the second branch 203 and close the first branch 202, and controls the fan 15 of the second cooling fan module 5 to turn on and the fan 15 of the first cooling fan module 4 to turn off; when the temperature of fuel cell 14 is greater than or equal to A2, the controller controls the three-way valve 7 to open both the first branch 202 and the second branch 203, and controls the fan 15 of the first cooling fan module 4 and the second cooling fan module 5 to turn on.

[0056] It should be noted that the temperature values ​​of the upper limit of the above-mentioned battery internal circulation heat dissipation system, A1 and A2 can be set according to the actual situation.

[0057] In this embodiment, to satisfy the condition that the cooling rate of the first cooling fan module 4 to the coolant in the water circulation pipe 2 is less than that of the second cooling fan module 5, the second cooling fan module 5 includes two fans 15, and the first cooling fan module 4 includes one fan 15. Furthermore, in this embodiment, the power of each fan is the same. In other embodiments, the power of the fan 15 in the first cooling fan module 4 can also be less than the power of the fan 15 in the second cooling fan module 5, and the number of fans in the first cooling fan module 4 and the second cooling fan module 5 can be the same, thereby achieving the condition that the cooling rate of the first cooling fan module 4 to the coolant in the water circulation pipe 2 is less than that of the second cooling fan module 5.

[0058] In this embodiment, the fuel cell 14 is arranged at the front of the vehicle frame 1, and the first cooling fan module 4 and the second cooling fan module 5 are both located on the front side of the fuel cell 14. This arrangement of the first cooling fan module 4 and the second cooling fan module 5 makes them relatively close to the fuel cell 14, the water circulation pipeline is relatively short, and the installation is relatively convenient.

[0059] The frame 1 includes longitudinal beams 101 extending front and rear and crossbeams 102 extending left and right. There are two longitudinal beams 101, spaced apart. The second cooling fan module 5 is disposed between the two longitudinal beams 101 and is fixed to both longitudinal beams 101 and crossbeams 102. Specifically, a left bracket 9 is fixed to the left longitudinal beam 101 and the right longitudinal beam 101, and a right bracket 10 is fixed to the right longitudinal beam 101. The second cooling fan module 5 is fixed to both longitudinal beams 101 and crossbeams 102 through the left bracket 9 and the right bracket 10. In addition, the two fans 15 of the second cooling fan module 5 are arranged vertically and staggered.

[0060] The first cooling fan module 4 and the second cooling fan module 5 are arranged side by side, with the first cooling fan module 4 positioned between the footboard of the electric truck cab and the longitudinal beam 101. This arrangement of the first cooling fan module 4 and the second cooling fan module 5 makes the entire battery cooling system structure more compact. Specifically, a front bracket 12 and a rear bracket 13 are fixed to the outer side of the longitudinal beam 101, and the first cooling fan module 4 is fixed to the front bracket 12 and the rear bracket 13 to be suspended on the outer surface of the longitudinal beam 101.

[0061] The first cooling fan module 4 and the second cooling fan module 5 of the battery cooling system of the electric truck of the present invention are arranged separately, which makes the first cooling fan module 4 and the second cooling fan module 5 smaller in size and closer to the ground, thereby making the electric truck more passable and the first cooling fan module 4 and the second cooling fan module 5 less likely to be damaged by scraping against the ground.

[0062] In addition, the first cooling fan module 4 and the second cooling fan module 5 are connected in parallel. The battery cooling system can flexibly turn the first cooling fan module 4 and the second cooling fan module 5 on or off according to the temperature of the fuel cell 14, so as to achieve precise control of the temperature of the fuel cell 14, rationally allocate energy, and save energy.

[0063] In Embodiment 2 of the electric truck of the present invention, unlike Embodiment 1, no liquid circuit control valve is installed on the water circulation pipeline. The first and second branches of the water circulation pipeline are always kept open. When the fuel cell temperature is lower than the adjustment limit of the internal circulation cooling system of the battery, the fuel cell temperature is regulated by the internal circulation cooling system of the fuel cell itself, the radiators of the first cooling fan module and the second cooling fan module. At this time, the controller of the battery cooling system controls the fans of the first cooling fan module and the second cooling fan module to turn off. When the fuel cell temperature is higher than the adjustment limit of the internal circulation cooling system of the battery and less than or equal to A1, the controller controls the fan of the first cooling fan module to turn on. When the fuel cell temperature is greater than A1 and less than A2, the controller controls the fan of the second cooling fan module to turn on and the fan of the first cooling fan module to turn off. When the battery temperature is greater than or equal to A2, the controller controls the fans of the first cooling fan module and the second cooling fan module to turn on.

[0064] In Embodiment 3 of the electric truck of the present invention, unlike Embodiment 1, when the fuel cell temperature is greater than A1, the controller controls the fan of the first cooling fan module and the first branch to turn on. Alternatively, in other embodiments, when the fuel cell temperature is greater than A1, the controller controls the fan of the first cooling fan module, the first branch, the fan of the second cooling fan module, and the second branch to turn on.

[0065] In Embodiment 4 of the electric truck of the present invention, unlike Embodiment 1, the second cooling fan module includes three fans, which are arranged vertically and staggered. Alternatively, in other embodiments, the second cooling fan module includes four, five, or other numbers of fans, which are also arranged vertically and staggered.

[0066] The electric truck embodiment 5 of the present invention differs from embodiment 1 in that the second cooling fan module includes two fans arranged side by side.

[0067] The electric truck embodiment 6 of the present invention differs from embodiment 1 in that a first valve is provided on the first branch, which controls the opening and closing of the first branch, and a second valve is provided on the second branch, which controls the opening and closing of the second branch.

[0068] In Embodiment 7 of the electric truck of the present invention, unlike Embodiment 1, the second cooling fan module is fixed only to the crossbeam of the frame. Alternatively, in other embodiments, the second cooling fan module is fixed only to one longitudinal beam of the frame, or the second cooling fan module is fixed to two longitudinal beams of the frame.

[0069] In Embodiment 8 of the electric truck of the present invention, unlike Embodiment 1, the battery cooling system dissipates heat for both the fuel cell and the storage battery. Alternatively, in other embodiments, the battery cooling system dissipates heat only for the storage battery.

[0070] The specific embodiment of the battery cooling system of the present invention has the same structure as the battery cooling system in any embodiment of the electric truck of the present invention described above, and will not be repeated here.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. An electric truck comprising a vehicle frame, a battery as a power source provided on the vehicle frame, and a battery heat dissipation system for dissipating heat of the battery of a fuel cell, the battery heat dissipation system comprising a water circulation line for dissipating heat of the battery and a water pump provided on the water circulation line, characterized by, The water circulation pipeline comprises a first branch and a second branch, the battery heat dissipation system further comprises first and second heat dissipation fan modules for cooling the coolant in the water circulation pipeline and arranged on the first and second branches respectively, the first and second heat dissipation fan modules each comprise a fan and a radiator, and the heat dissipation speed of the first heat dissipation fan module is less than the heat dissipation speed of the second heat dissipation fan module for the coolant in the water circulation pipeline; the battery heat dissipation system further comprises a controller and a temperature sensor for monitoring the temperature of the battery, the controller can control the opening and closing of the fan of the first and second heat dissipation fan modules according to the temperature signal of the temperature sensor, and when the fan of at least one of the first and second heat dissipation fan modules is turned on, the controller controls the first and second heat dissipation fan modules in the following manner: when the temperature of the battery is less than or equal to A, the controller controls the fan of the first heat dissipation fan module to be turned on and the fan of the second heat dissipation fan module to be turned off, and when the temperature of the battery is greater than A, the controller controls the fan of the second heat dissipation fan module to be turned on and the fan of the first heat dissipation fan module to be turned off; the fuel cell is arranged at the front of the frame, the second heat dissipation fan module is arranged at the front side of the fuel cell, the second heat dissipation fan module is arranged between the left and right longitudinal beams of the frame, the first heat dissipation fan module and the second heat dissipation fan module are arranged on the left and right sides, and the first heat dissipation fan module is arranged between the right side pedal of the cab of the electric truck and the right side longitudinal beam.

2. The electric truck of claim 1, wherein, The outer side of the longitudinal beam (101) is provided with a front support (12) and a rear support (13), and the front support (12) and the rear support (13) are arranged in front of and behind each other along the extension direction of the longitudinal beam (101), and the first heat dissipation fan module (4) is suspended on the outer side of the longitudinal beam (101) through the front support (12) and the rear support (13).

3. The electric truck of claim 1, wherein, The frame comprises a transverse beam (102) extending leftward and rightward, and the second heat dissipation fan module (5) is fixed to both of the two longitudinal beams (101) and the transverse beam (102).

4. The electric truck of claim 1, wherein, When the temperature of the battery is greater than A1 and less than A2, the controller controls the fan of the second heat dissipation fan module (5) to be turned on and the fan of the first heat dissipation fan module (4) to be turned off, and when the temperature of the battery is greater than or equal to A2, the controller controls the fans of the first heat dissipation fan module (4) and the second heat dissipation fan module (5) to be turned on.

5. The electric truck of claim 1, wherein, The fan of the second heat dissipation fan module (5) is provided with at least two fans.

6. The electric truck of claim 5, wherein, The fan of the second heat dissipation fan module has two fans, the two fans are arranged in an up-down manner, and the projections of the two fans in the up-down direction and the left-right direction partially overlap.

7. The electric truck of claim 1 or 4 or 5, wherein, The water circulation pipeline (2) is provided with a liquid path control valve for controlling the opening and closing of the first branch (202) and the second branch (203), the controller is connected with the liquid path control valve, and the controller controls the liquid path control valve to close the first branch when the fan of the first heat dissipation fan module (4) is controlled to be turned off, and the control valve controls the liquid path control valve to close the second branch when the fan of the second heat dissipation fan module (5) is controlled to be turned off.

8. The electric truck of claim 1, wherein, The battery further comprises a storage battery, and the storage battery is arranged at the rear side of the fuel cell (14).

9. A heat dissipation system for a fuel cell comprising a water circulation line for dissipating heat from the fuel cell and a water pump provided on the water circulation line, characterized in that, The water circulation pipeline comprises a first branch and a second branch, the battery heat dissipation system further comprises a first heat dissipation fan module and a second heat dissipation fan module for cooling the coolant in the water circulation pipeline and arranged on the first branch and the second branch respectively, the first heat dissipation fan module and the second heat dissipation fan module each comprise a fan and a radiator, the heat dissipation speed of the first heat dissipation fan module is less than the heat dissipation speed of the second heat dissipation fan module for the coolant in the water circulation pipeline, the second heat dissipation fan module is arranged on the front side of the fuel cell between the left and right longitudinal beams at the front of the vehicle frame, the second heat dissipation fan module is arranged on the left and right of the first heat dissipation fan module, and the first heat dissipation fan module is arranged between the right side step of the cab of the electric truck and the right side longitudinal beam; the battery heat dissipation system further comprises a controller and a temperature sensor for monitoring the temperature of the battery, the controller can control the opening and closing of the fans of the first heat dissipation fan module and the second heat dissipation fan module according to the temperature signal of the temperature sensor, and when the fan of at least one of the first heat dissipation fan module and the second heat dissipation fan module is turned on, the controller controls the fan of the first heat dissipation fan module to be turned on and the fan of the second heat dissipation fan module to be turned off when the battery temperature is less than or equal to A, and the controller controls the fan of the second heat dissipation fan module to be turned on and the fan of the first heat dissipation fan module to be turned off when the battery temperature is greater than A.

10. The heat dissipation system for a battery according to claim 9, wherein When the battery temperature is greater than A1 and less than A2, the controller controls the fan of the second heat dissipation fan module (5) to be turned on and the fan of the first heat dissipation fan module (4) to be turned off, and when the battery temperature is greater than or equal to A2, the controller controls the fans of the first heat dissipation fan module (4) and the second heat dissipation fan module (5) to be turned on.

11. The heat dissipation system for a battery according to claim 9, wherein The fan of the second heat dissipation fan module (5) is provided with at least two.

12. The heat dissipation system for a battery according to claim 9 or 10 or 11, characterized by, The water circulation pipeline (2) is provided with a liquid path control valve for controlling the opening and closing of the first branch (202) and the second branch (203), the controller is connected with the liquid path control valve, the controller controls the liquid path control valve to close the first branch when the fan of the first heat dissipation fan module (4) is controlled to be turned off, and the control valve controls the liquid path control valve to close the second branch when the fan of the second heat dissipation fan module (5) is controlled to be turned off.

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