Hydrogen circulating pump for fuel cell and heating method thereof

Abstract

The invention discloses a hydrogen circulating pump for a fuel cell and a heating method of the hydrogen circulating pump, and the hydrogen circulating pump comprises: a housing in which a first accommodating cavity and a second accommodating cavity are formed; the motor rotor is accommodated in the first accommodating cavity, one end of the motor rotor is rotatably connected with the shell, and the other end of the motor rotor is provided with a rotor shell; the impeller is contained in the first containing cavity and is in linkage with the motor rotor, and the impeller is located on the radial periphery of at least part of the rotor shell; the motor stator is accommodated in the second accommodating cavity and is connected with the shell; and in a cross section perpendicular to the axial direction, the projection of the rotor shell is located in the projection of the motor stator. According to the hydrogen circulating pump for the fuel cell provided by the embodiment of the invention, the hydrogen circulating pump can be started more quickly at low temperature.

Description

Technical Field

[0001] This application relates to the field of fuel cells, and particularly to a hydrogen circulation pump for a fuel cell and a heating method thereof. Background Art

[0002] In related technologies, a large amount of liquid water is generated on the anode side during the operation of a fuel cell. The water will enter the compressor inside the hydrogen circulation pump along with the unreacted hydrogen. When the ambient temperature drops below 0°C, the hydrogen pump impeller and the compressor housing will freeze after the fuel cell shuts down, which will affect the normal rotation of the impeller when the fuel cell system starts.

[0003] Therefore, existing hydrogen pump compressors usually integrate a water channel on the compressor housing and circulate a coolant with a relatively high temperature in the water channel to heat the hydrogen pump so as to melt the ice. However, adopting the above structure requires integrating a coolant flow channel and its supporting sealing measures on the compressor housing, which increases the structural complexity, and the heating and heat exchange of the coolant result in too long start-up time. Some hydrogen pump compressors increase the torque of the hydrogen pump motor during cold start to break the ice inside the compressor housing. However, when the hydrogen pump impeller and the compressor housing are frozen together and cause a stall, it is difficult for the motor to exert the maximum torque, and it is difficult to ensure that the compressor can start successfully. Moreover, the ice will collide with the high-speed rotating impeller, which will also reduce the service life of the hydrogen pump. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of this application is to provide a hydrogen circulation pump for a fuel cell, which can start faster at low temperatures.

[0005] This application further provides a heating method applied to the above hydrogen circulation pump.

[0006] The hydrogen circulation pump for a fuel cell according to an embodiment of this application includes: a housing, a first accommodation cavity and a second accommodation cavity are formed inside the housing; a motor rotor, the motor rotor is received in the first accommodation cavity and one end of the motor rotor is rotatably connected to the housing, and a rotor housing is provided at the other end of the motor rotor; an impeller, the impeller is received in the first accommodation cavity and is linked with the motor rotor, and the impeller is located at least partially radially outside the rotor housing; a motor stator, the motor stator is received in the second accommodation cavity and is connected to the housing; wherein, in a cross-section perpendicular to the axial direction, the projection of the rotor housing is located inside the projection of the motor stator.

[0007] A hydrogen circulation pump for a fuel cell according to an embodiment of the present application. The hydrogen circulation pump has a housing, an impeller, a motor rotor, and a motor stator. The motor rotor, the impeller, and the motor stator can be arranged inside the housing. The impeller can be linked with the motor rotor. The end of the motor rotor can be provided with a rotor housing. The impeller can be located on a part of the outer circumference of the rotor housing. And the rotor housing can be arranged corresponding to the motor stator. When the hydrogen circulation pump freezes due to too low ambient temperature, by passing alternating current into the motor stator, the rotating magnetic field generated by the motor stator cuts the rotor housing to generate a circulating current, so that the rotor housing is quickly heated up, thereby directly thawing the frozen part, improving the thawing efficiency and the service life of the hydrogen circulation pump. Compared with the prior art, there is no need to additionally set up a flow channel, which is convenient for processing.

[0008] In some embodiments of the present application, the housing includes a first housing and a second housing connected in sequence along the axial direction; an installation groove is formed on the first housing, and the installation groove and the second housing define the first accommodation cavity, and the motor rotor and the impeller are rotatably arranged in the installation groove; a second accommodation cavity is formed on the second housing, and the motor stator is received in the second accommodation cavity and connected to the second housing.

[0009] In some embodiments of the present application, the rotor housing is annular and connected to the outer wall of the motor rotor, and the rotor housing is linked with the motor rotor.

[0010] In some embodiments of the present application, the rotor housing and the motor rotor are in interference fit.

[0011] In some embodiments of the present application, an inlet end and an outlet end communicating with the first accommodation cavity are formed on the first housing.

[0012] The heating method of the embodiment of the present application is described below.

[0013] A heating method for a hydrogen circulation pump according to an embodiment of the present application. The heating method is applied to the above hydrogen circulation pump. The heating method includes: obtaining the current ambient temperature T1; judging the relationship between the current ambient temperature T1 and the preset ambient temperature T0; when the current ambient temperature T1 is less than the preset ambient temperature T0, detecting whether the hydrogen circulation pump can be started; if the hydrogen circulation pump cannot be started, turning on the heating function.

[0014] A heating method for a hydrogen circulation pump according to an embodiment of the present application. The heating method can be applied to the hydrogen circulation pump in the above embodiment. The heating method can judge whether to turn on the heating function according to the current ambient temperature and the current state of the hydrogen circulation pump, and can directly thaw the frozen part after the hydrogen circulation pump turns on the heating function, improving the thawing efficiency and the service life of the hydrogen circulation pump.

[0015] In some embodiments of the present application, when the hydrogen circulation pump turns on the heating function, the hydrogen circulation pump maintains a preset frequency f, and satisfies: 1800 Hz ≤ f ≤ 2200 Hz.

[0016] In some embodiments of the present application, the heating method further includes: obtaining the startup time t1 required for the hydrogen circulation pump from turning on the heating function until startup; judging the relationship between the startup time t1 required for the hydrogen circulation pump from turning on the heating function until startup and the preset startup time t0 of the hydrogen circulation pump turning on the heating function; if the startup time t1 is less than or equal to the preset startup time t0, the hydrogen circulation pump is in a normal working condition; turn off the heating function after the hydrogen circulation pump starts.

[0017] In some embodiments of the present application, the heating method further includes: if the hydrogen circulation pump still does not start after continuously turning on the heating function for the preset startup time t0, turn off the heating function.

[0018] In some embodiments of the present application, the preset time t0 for the heating function to last satisfies: 10 s ≤ t0 ≤ 60 s.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 is an exploded view of a hydrogen circulation pump according to an embodiment of the present application;

[0022] Figure 2 is Figure 1 an exploded view from another angle of

[0023] Figure 3 is Figure 1 an exploded view of a partial structure in

[0024] Figure 4 is a flowchart of a heating method according to an embodiment of the present application;

[0025] Figure 5 is another flowchart of a heating method according to an embodiment of the present application.

[0026] Reference numerals:

[0027] 10. Hydrogen circulation pump;

[0028] 11. Housing; 111. First housing; 1111. Installation groove; 1112. First groove body; 1113. Second groove body; 1114. Inlet end; 1115. Outlet end;

[0029] 112. Second housing; 1121. Second accommodation cavity; 12. Motor rotor; 121. Rotor housing;

[0030] 13. Impeller; 14. Motor stator. Detailed implementation manners

[0031] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0032] Refer to the following Figures 1-3 to describe the hydrogen circulation pump 10 for a fuel cell according to an embodiment of the present application. The hydrogen circulation pump 10 includes a housing 11, a motor rotor 12, an impeller 13, and a motor stator 14.

[0033] A first accommodation cavity and a second accommodation cavity 1121 are formed inside the housing 11. The motor rotor 12 is received in the first accommodation cavity, and one end of the motor rotor 12 is rotatably connected to the housing 11. A rotor housing 121 is provided at the other end of the motor rotor 12. The impeller 13 is received in the first accommodation cavity and is linked with the motor rotor 12. The impeller 13 is located at least partially radially outside the rotor housing 121. The motor stator 14 is received in the second accommodation cavity 1121 and is connected to the housing 11. Wherein, in a cross-section perpendicular to the axial direction, the projection of the rotor housing 121 is located inside the projection of the motor stator 14.

[0034] Currently, when a fuel cell is operating, a large amount of liquid water will be generated on the anode side. The water will enter the compressor inside the hydrogen circulation pump along with the unreacted hydrogen. When the ambient temperature drops below 0 °C, the impeller of the hydrogen pump and the compressor housing will freeze after the fuel cell stops operating, which will affect the normal rotation of the impeller when the fuel cell system starts.

[0035] Therefore, existing hydrogen pump compressors usually integrate a water channel on the pressure housing and circulate coolant with a relatively high temperature in the water channel to heat the hydrogen pump so as to melt the ice. However, adopting the above structure requires integrating a coolant flow channel and its supporting sealing measures on the pressure housing, which increases the structural complexity, and the heating and heat exchange of the coolant result in too long start-up time. Some hydrogen pump compressors increase the torque of the hydrogen pump motor during cold start to break the ice inside the pressure housing. However, when the hydrogen pump impeller is frozen together with the pressure housing and causes a stall, it is difficult for the motor to exert the maximum torque, making it difficult to ensure the successful start of the compressor. Moreover, the ice will collide with the high-speed rotating impeller, reducing the service life of the hydrogen pump.

[0036] In response to this, the present application proposes a hydrogen circulation pump 10 for a fuel cell. The hydrogen circulation pump 10 may include a housing 11, a motor rotor 12, an impeller 13, and a motor stator 14. A first accommodation cavity and a second accommodation cavity 1121 may be formed inside the housing 11. At least part of the first accommodation cavity may be used for the flow of hydrogen. The electronic rotor may be received in the first accommodation cavity, and one end of the motor rotor 12 can be rotatably connected to the housing 11. Optionally, a rotating shaft may be provided on the housing 11, and the motor rotor 12 may be sleeved on the rotating shaft, or the motor rotor 12 and the housing 11 may be directly connected through a bearing. The other end of the motor rotor 12 may be provided with a rotor housing 121. The rotor housing 121 may be sleeved on the motor rotor 12, and the rotor housing 121 can be linked with the motor rotor 12.

[0037] The impeller 13 may be received in the first accommodation cavity. The impeller 13 can play a role in driving the flow of hydrogen, and the impeller 13 can be linked with the motor rotor 12. While the motor rotor 12 rotates, it drives the impeller 13 to rotate synchronously, thereby realizing the role of driving the flow of hydrogen. The impeller 13 may be located at the radial outer periphery of at least part of the rotor housing 121. The radial direction may be the radial direction of the rotor. The motor stator 14 may be received in the second accommodation cavity 1121, and the motor stator 14 can be connected to the housing 11. Optionally, the motor stator 14 and the housing 11 may be detachably connected by snap connection or plug connection.

[0038] Furthermore, in a cross-section perpendicular to the axial direction, the projection of the rotor housing 121 can be located inside the projection of the motor stator 14. It can be understood that the rotor housing 121 can be correspondingly arranged with the motor stator 14. When the environmental temperature drops below 0°C and ice forms inside the hydrogen circulation pump 10, by passing an alternating current through the motor stator 14, the electronic stator generates an alternating magnetic field. The rotor housing 121 can be made of a magnetic or conductive material. When the alternating magnetic field is applied to the stationary rotor housing 121, a circulating current will be generated inside the rotor housing 121, and the circulating current will flow in a vortex shape around the magnetic field inside it. Since there is resistance inside the rotor housing 121, the temperature of the rotor housing 121 will rise rapidly under the action of the circulating current. The impeller 13 can be located at least partially on the outer periphery of the rotor housing 121. The heat generated by the rotor housing 121 can be transferred to the impeller 13 and then from the impeller 13 to the housing 11, thereby directly thawing the frozen part. When the electronic rotor rotates, it drives the rotor housing 121 to rotate synchronously, and the rotor housing 121 will not generate a large amount of heat, avoiding the problem of the rotor housing 121 heating up during the normal use of the hydrogen circulation pump 10. Moreover, thawing through the rotor housing 121 can reduce the thawing time and directly conduct heat to the frozen part, ensuring that the ice can completely melt and improving the service life of the hydrogen circulation pump 10.

[0039] In short, the hydrogen circulation pump 10 of the embodiment of the present application has a housing 11, an impeller 13, a motor rotor 12 and a motor stator 14. The motor rotor 12, the impeller 13 and the motor stator 14 can be arranged inside the housing 11. The impeller 13 can be linked with the motor rotor 12. The end of the motor rotor 12 can be provided with a rotor housing 121. The impeller 13 can be located at least partially on the outer periphery of the rotor housing 121, and the rotor housing 121 can be correspondingly arranged with the motor stator 14. When the environmental temperature is too low and the hydrogen circulation pump 10 freezes, by passing an alternating current through the motor stator 14, the rotating magnetic field generated by the motor stator 14 cuts the rotor housing 121 to generate a circulating current, so that the rotor housing 121 is quickly heated up, thereby directly thawing the frozen part, improving the thawing efficiency and the service life of the hydrogen circulation pump 10. Compared with the prior art, there is no need to additionally set up a flow channel, which is convenient for processing.

[0040] Such as Figure 2As shown, in some embodiments of the present application, the housing 11 may include a first housing 111 and a second housing 112. The first housing 111 and the second housing 112 may be sequentially connected along the axial direction. In a specific embodiment, the first housing 111 may be configured as a pressure housing, and the second housing 112 may be configured as a motor housing. Optionally, the first housing 111 and the second housing 112 may be detachably connected by screws or bolts, or the first housing 111 and the second housing 112 may be detachably connected by snap connection or plug connection. Among them, the first housing 111 and the second housing 112 are hermetically connected to prevent external air from flowing into the first accommodation cavity and affecting the purity of hydrogen.

[0041] Further, an installation groove 1111 may be formed on the first housing 111. The installation groove 1111 and the second housing 112 can define a first accommodation cavity. The motor rotor 12 and the impeller 13 are rotatably arranged in the installation groove 1111. The installation groove 1111 may include a first groove body 1112 and a second groove body 1113. The depth of the first groove body 1112 may be greater than that of the second groove body 1113. The second groove body 1113 may be located on the outer periphery of the first groove body 1112 in the radial direction. Among them, the first groove body 1112 can be used to install the motor rotor 12, and the second groove body 1113 can be used to install the impeller 13. A second accommodation cavity 1121 may be formed on the second housing 112. The motor stator 14 can be received in the second accommodation cavity 1121, and the motor stator 14 can be connected to the second housing 112. A partition may be formed on the side of the second housing 112 facing the first housing 111, and the motor stator 14 can be disposed opposite to the partition.

[0042] As Figure 3 As shown, in some embodiments of the present application, the rotor housing 121 may be annular, and the rotor housing 121 can be connected to the outer peripheral wall of the motor rotor 12. Such a setting can reduce the axial dimensions of the motor rotor 12 and the rotor housing 121, save space, and is beneficial to miniaturized design. And connecting the rotor housing 121 to the outer peripheral wall of the motor rotor 12 helps to realize the linkage between the rotor housing 121 and the motor rotor 12, ensuring that the rotor housing 121 does not interfere with other parts during rotation. Optionally, the rotor housing 121 and the motor rotor 12 may be detachably connected by screws or bolts, or the rotor housing 121 and the motor rotor 12 may be directly welded and fixed through the contact surface. In some embodiments, the rotor housing 121 and the motor rotor 12 may be in interference fit, so that the rotor housing 121 and the motor rotor 12 generate a large frictional force through close contact, making it difficult for the rotor housing 121 and the motor rotor 12 to loosen.

[0043] As Figure 2 And as Figure 3As shown, in some embodiments of the present application, an inlet end 1114 and an outlet end 1115 may be formed on the first housing 111. The inlet end 1114 and the outlet end 1115 can communicate with the first accommodation cavity. The inlet end 1114 can be used to input hydrogen, and the hydrogen is guided to the outlet end 1115 through the rotation of the impeller 13 in the first accommodation cavity, realizing the flow of hydrogen.

[0044] Next, refer to Figures 4-5 Describe a heating method for a hydrogen circulation pump according to an embodiment of the present application. The heating method is applied to the hydrogen circulation pump in the above embodiment. The heating method includes: obtaining the current ambient temperature T1; judging the relationship between the current ambient temperature T1 and the preset ambient temperature T0; when the current ambient temperature T1 is less than the preset ambient temperature T0, detecting whether the hydrogen circulation pump can be started; if the hydrogen circulation pump cannot be started, turning on the heating function.

[0045] As Figure 4 shown, specifically, the heating method may include: S1. Obtain the current ambient temperature T1. The current ambient temperature can be understood as the outdoor temperature, and the ambient temperature can be detected by other devices such as a thermometer.

[0046] S2. Judge the relationship between the current ambient temperature T1 and the preset ambient temperature T0. After obtaining the current ambient temperature T1, the current ambient temperature T1 can be compared with the preset ambient temperature T0. Here, it needs to be explained that the preset ambient temperature T0 can satisfy the following relational expression: T0 ≤ 0, which can be understood as T0 can be equal to or lower than 0 degrees Celsius. At this temperature, icing occurs in the hydrogen circulation pump.

[0047] S3. When the current ambient temperature T1 is less than the preset ambient temperature T0, detect whether the hydrogen circulation pump can be started. Further judge the current ambient temperature T1 and the preset ambient temperature T0. If the current ambient temperature T1 is greater than the preset ambient temperature T0, the hydrogen circulation pump is not considered. If the current ambient temperature T1 is less than the preset ambient temperature T0, further detect whether the hydrogen circulation pump can be started.

[0048] S4. If the hydrogen circulation pump cannot be started, turn on the heating function. It should be noted that the heating function can be used to thaw the rotor housing by heating. Specifically, by passing an alternating current through the motor stator, the electronic stator generates an alternating magnetic field. The rotor housing can be a magnetic or conductive material. When the alternating magnetic field is applied to the stationary rotor housing, a circulating current will be generated inside the rotor housing, and the circulating current will flow in a vortex shape around the magnetic field inside it. Since there is resistance inside the rotor housing, the temperature of the rotor housing will rise rapidly under the action of the circulating current. The impeller can be located at least partially on the radial outer periphery of the rotor housing, and the heat generated by the rotor housing can directly thaw the icing part.

[0049] In short, the heating method for the hydrogen circulation pump according to the embodiments of the present application can be applied to the hydrogen circulation pump in the above embodiments. This heating method can determine whether to turn on the heating function based on the current ambient temperature and the current state of the hydrogen circulation pump, and can directly thaw the frozen part after the heating function of the hydrogen circulation pump is turned on, improving the thawing efficiency and the service life of the hydrogen circulation pump.

[0050] In some embodiments of the present application, when the heating function of the hydrogen circulation pump is turned on, the hydrogen circulation pump maintains a preset frequency f, satisfying the relational expression: 1800Hz ≤ f ≤ 2200Hz. It can be understood that the preset frequency of the hydrogen circulation pump can be any value between 1800Hz and 2200Hz. For example, the preset frequency of the hydrogen circulation pump can be, but is not limited to, 1800Hz, 1900Hz, 2000Hz, 2100Hz, 2200Hz, etc. By maintaining the hydrogen circulation pump at the preset frequency f, the power of the hydrogen circulation pump can reach the maximum value after the heating function is turned on, enabling the rotor housing to quickly heat up and improving the thawing efficiency.

[0051] As Figure 5 shown, in some embodiments of the present application, the heating method further includes:

[0052] S51. Obtain the start-up time t1 required for the hydrogen circulation pump from when the heating function is turned on until it starts. It can be understood that when the heating function of the hydrogen circulation pump is turned on, the time is recorded until the hydrogen circulation pump can be normally started, that is, when the ice has melted, and the time is recorded again. The start-up time t1 is obtained by recording the time twice.

[0053] S52. Judge the relationship between the start-up time t1 required for the hydrogen circulation pump from when the heating function is turned on until it starts and the preset start-up time t0 of the hydrogen circulation pump when the heating function is turned on. The relationship between the calculated start-up time t1 and the preset start-up time t0 of the hydrogen circulation pump when the heating function is turned on, where the preset start-up time t0 can satisfy the relational expression: 10s ≤ t0 ≤ 60s, and the preset start-up time t0 can be set according to the actual working conditions.

[0054] S53. If the start-up time t1 is less than or equal to the preset start-up time t0, then the hydrogen circulation pump is in a normal working condition. It can be understood that when the start-up time t1 is less than or equal to the preset start-up time t0, the hydrogen circulation pump can start, and at this time the hydrogen circulation pump is in a normal working condition. When the start-up time t1 is greater than the preset start-up time t0, at this time, within the preset start-up time, the ice has melted, and the hydrogen circulation pump still needs additional time to start after the ice has melted, indicating that there are internal defects in the hydrogen circulation pump at this time, such as problems with internal component wear and aging, bearing wear, etc.

[0055] S54. After the hydrogen circulation pump starts, turn off the heating function. After the hydrogen circulation pump can start normally, turn off the heating function to prevent the rotor housing from continuously heating up and overheating, which may affect normal use.

[0056] In some embodiments of the present application, the heating method further includes: if the hydrogen circulation pump fails to start after the heating function has been turned on for a preset start-up time t0, turn off the heating function. It can be understood that when the hydrogen circulation pump fails to start after the heating function has been turned on for the preset start-up time, there may be internal defects in the hydrogen circulation pump, such as wear and aging of internal components, bearing wear, etc. Turning off the heating function can prevent the rotor housing from overheating and damaging the hydrogen circulation pump.

[0057] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application.

[0058] In the description of the present application, the "first feature" and "second feature" may include one or more of such features.

[0059] In the description of the present application, the meaning of "a plurality" is two or more.

[0060] In the description of the present application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0061] In the description of the present application, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0063] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. A hydrogen circulation pump for a fuel cell, characterized in that: include: A shell, wherein a first accommodating cavity and a second accommodating cavity are formed in the shell; A motor rotor, wherein the motor rotor is accommodated in the first accommodating cavity and one end of the motor rotor is rotatably connected to the housing, and the other end of the motor rotor is provided with a rotor housing; An impeller, the impeller is accommodated in the first accommodating chamber and is linked to the motor rotor, and the impeller is located at the radial outer periphery of at least part of the rotor housing; a motor stator, the motor stator being received in the second accommodation cavity and connected to the housing; In the cross section perpendicular to the axial direction, the projection of the rotor housing is located inside the projection of the motor stator.

2. The hydrogen circulation pump for a fuel cell according to claim 1, characterized in that: The housing comprises a first shell and a second shell connected in sequence along the axial direction; A mounting groove is formed on the first housing, the mounting groove and the second housing define the first accommodating cavity, and the motor rotor and the impeller are rotatably disposed in the mounting groove; The second housing is formed with the second accommodating cavity, and the motor stator is accommodated in the second accommodating cavity and connected to the second housing.

3. The hydrogen circulation pump for a fuel cell according to claim 2, characterized in that: The rotor housing is annular and connected to the outer wall of the motor rotor, and the rotor housing is linked with the motor rotor.

4. The hydrogen circulation pump for a fuel cell according to claim 3, characterized in that: The rotor housing is interference fit with the motor rotor.

5. The hydrogen circulation pump for a fuel cell according to claim 2, characterized in that: The first shell is formed with an inlet end and an outlet end which are communicated with the first accommodating cavity.

6. A heating method for a hydrogen circulation pump, characterized in that: The heating method is applied to the hydrogen circulation pump according to any one of claims 1 to 5, and the heating method comprises: Get the current ambient temperature T1; Determine the relationship between the current ambient temperature T1 and the preset ambient temperature T0; When the current ambient temperature T1 is lower than the preset ambient temperature T0, detecting whether the hydrogen circulation pump can be started; If the hydrogen circulation pump cannot be started, the heating function is turned on.

7. The heating method for a hydrogen circulation pump according to claim 6, characterized in that: When the heating function of the hydrogen circulation pump is turned on, the hydrogen circulation pump maintains a preset frequency f and satisfies: 1800 Hz≤f≤2200 Hz.

8. The heating method for a hydrogen circulation pump according to claim 6, characterized in that: The heating method further comprises: Obtaining the start-up time t1 required for the hydrogen circulation pump to start after the heating function is turned on; Determine the relationship between the start-up time t1 required for the hydrogen circulation pump to start after the heating function is turned on and the preset start-up time t0 for turning on the heating function of the hydrogen circulation pump; If the start-up time t1 is less than or equal to the preset start-up time t0, the hydrogen circulation pump is in a normal working condition; The heating function is turned off after the hydrogen circulation pump is started.

9. The heating method for a hydrogen circulation pump according to claim 8, characterized in that: The heating method further comprises: If the hydrogen circulation pump still fails to start after the heating function is turned on for a preset start-up time t0, the heating function is turned off.

10. The heating method for a hydrogen circulation pump according to claim 9, characterized in that: The heating function lasts for a preset time t0 that satisfies: 10s≤t0≤60s.

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