Patent Publication Number: US-2021195789-A1

Title: Heat dissipation assembly, heat dissipation device, and unmanned aerial vehicle

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of International Application No. PCT/CN2018/100872, filed Aug. 16, 2018, the entire content of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of heat dissipation technology and, more particularly, to a heat dissipation assembly, a heat dissipation device, and an unmanned aerial vehicle. 
     BACKGROUND 
     There are a large number of heat generation elements in electronic equipment. The heat emitted by the heat generation elements needs to be exported in time to ensure the normal operation of the electronic equipment. At present, the heat is dissipated by setting a fan in the electronic equipment or by conducting heat through a housing of the electronic equipment. Correspondingly the heat accumulated in the electronic equipment is exported outside, such that the electronic equipment is prevented from failing to work normally due to heat accumulation. In the above heat dissipation method, the direction of the airflow in the electronic equipment is not planned, and part of the airflow is led out without sufficient heat exchange. Correspondingly, the utilization rate of the airflow is low, resulting in low heat dissipation efficiency. 
     SUMMARY 
     In accordance with the disclosure, there is provided a heat dissipation assembly including a fan and a heat conduction member connected to the fan. The fan includes an air outlet. An end of the heat conduction member cooperates with the air outlet of the fan and another end of the heat conduction member is provided with a plurality of flow outlets that are grouped into at least two groups facing different directions. Airflow from the air outlet of the fan flows through the heat conduction member and then flows out through the plurality of flow outlets. 
     Also in accordance with the disclosure, there is provided an unmanned aerial vehicle including a vehicle body including a receiving space and provided with an airflow exit, a circuit board, and heat dissipation assembly connected to the circuit board. The circuit board and the heat dissipation assembly are accommodated in the receiving space. The heat dissipation assembly includes a fan and a heat conduction member connected to the fan. The fan includes an air outlet. An end of the heat conduction member cooperates with the air outlet of the fan and another end of the heat conduction member is provided with a plurality of flow outlets that are grouped into at least two groups facing different directions. Airflow from the air outlet of the fan flows through the heat conduction member and then flows out through the plurality of flow outlets. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and/or additional aspects and advantages of this disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings. 
         FIG. 1  is a perspective view of an exemplary heat dissipation assembly consistent with various embodiments of the present disclosure. 
         FIG. 2  is an exploded view of an exemplary heat dissipation assembly consistent with various embodiments of the present disclosure. 
         FIG. 3  is an exploded view of an exemplary heat dissipation device consistent with various embodiments of the present disclosure. 
         FIG. 4  is an exploded view of another exemplary heat dissipation device consistent with various embodiments of the present disclosure. 
         FIG. 5  is a perspective view of an exemplary heat dissipation device consistent with various embodiments of the present disclosure. 
         FIG. 6  is a partial enlarged view of the heat dissipation device in  FIG. 5 . 
         FIG. 7  is a perspective view of an unmanned aerial vehicle consistent with various embodiments of the present disclosure. 
         FIG. 8  is an exploded view of an unmanned aerial vehicle consistent with various embodiments of the present disclosure. 
         FIG. 9  is a perspective view of another unmanned aerial vehicle consistent with various embodiments of the present disclosure. 
         FIG. 10  is a perspective view of another unmanned aerial vehicle consistent with various embodiments of the present disclosure. 
         FIG. 11  is an exploded view of another unmanned aerial vehicle consistent with various embodiments of the present disclosure. 
     
    
    
     REFERENCE NUMERALS 
     
         
           100 : vehicle body;  101 : main body;  102 : upper cover;  103 : lower cover;  104 : front cover;  105 : rear cover;  110 : receiving space;  120 : airflow exit;  121 : first airflow exit;  122 : second airflow exit;  123 : third airflow exit;  130 : air inlet member;  140 : first side wall;  150 : second side wall;  160 : third side wall; 
           200 : circuit board;  210 : first circuit board;  201 : first area;  202 : second area;  203 : third area;  204 : functional device;  205 : positioning member;  220 : second circuit board;  230 : third circuit board; 
           300 : heat dissipation assembly;  1 : fan;  11 : first air outlet;  12 : first air inlet;  13 : housing;  13   a : fixed end;  14 : fan blade;  2 : heat conduction member;  21 : flow outlet;  211 : first flow outlet;  212 : second flow outlet;  213 : third flow outlet;  22 : main body;  221 : first mounting member;  23 : heat conduction sheet;  231 : heat dissipation rib;  24 : cover body;  241 : second mounting member;  3 : damping member;  4 : fastener; 
           400 : arm; 
           500 : gimbal; 
           600 : Battery assembly. 
       
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Technical solutions of the present disclosure will be described with reference to the drawings. It will be appreciated that the described embodiments are part rather than all of the embodiments of the present disclosure. Other embodiments conceived by those having ordinary skills in the art on the basis of the described embodiments without inventive efforts should fall within the scope of the present disclosure. 
     Example embodiments will be described with reference to the accompanying drawings, in which the same numbers refer to the same or similar elements unless otherwise specified. 
     As used herein, when a first component is referred to as “fixed to” a second component, it is intended that the first component may be directly attached to the second component or may be indirectly attached to the second component via another component. When a first component is referred to as “connecting” to a second component, it is intended that the first component may be directly connected to the second component or may be indirectly connected to the second component via a third component between them. The terms “perpendicular,” “horizontal,” “left,” “right,” and similar expressions used herein are merely intended for description. 
     Unless otherwise defined, all the technical and scientific terms used herein have the same or similar meanings as generally understood by one of ordinary skill in the art. As described herein, the terms used in the specification of the present disclosure are intended to describe example embodiments, instead of limiting the present disclosure. The term “and/or” used herein includes any suitable combination of one or more related items listed. 
       FIG. 1  and  FIG. 2  show a heat dissipation assembly  300  consistent with the disclosure. The heat dissipation assembly  300  includes a fan  1  and a heat conduction member  2  connected to the fan  1 . The fan  1  includes a first air outlet  11 . One end of the heat conduction member  2  cooperates with the first air outlet  11 . A plurality of flow outlets  21  are disposed at another end of the heat conduction component  2 . In some embodiments, airflow flowing out from the first air outlet  11  may flow through the heat conduction member  2  and then flow out via the plurality of flow outlets  21 . When the airflow flows through the heat conduction member  2 , it may contact the heat conduction member  2  efficiently, to take away the heat accumulated in the heat conduction member  2  and achieve sufficient heat exchange. 
     Further, the plurality of flow outlets  21  include at least two groups of flow outlets. The at least two groups of flow outlets  21  face different directions. Part of the airflow from the at least two groups of flow outlets  21  flows directly to the outside of the electronic device, and the other part of the airflow from the at least two groups of airflow outlets  21  directly dissipates the main heat generation elements in the electronic device, to achieve high heat dissipation efficiency. 
     In various embodiments, the plurality of flow outlets  21  may include two, three, four, or more groups of flow outlets. A number of the plurality of flow outlets  21  may be determined according to a shape of the electronic device, heat dissipation requirement of the electronic device, distribution of the heat generation elements. In some embodiments, as illustrated in  FIG. 2 , the plurality of flow outlets  21  include a first flow outlet  211 , a second flow outlet  212 , and a third flow outlet  213 . The second flow outlet  212  and the third flow outlet  213  are disposed at two sides of the first flow outlet  211 , respectively. In some embodiments, the airflow from the first flow outlet  211  can directly dissipate the heat of the heat generation elements. For example, the first flow outlet  211  may be disposed close to or directly aligned with the heat generation elements. The airflow from the second flow outlet  212  and the third flow outlet  213  can be directly exported to the outside of the electronic device. 
     Further, in some embodiments, as illustrated in  FIG. 1  and  FIG. 2 , outlet directions of the first flow outlet  211 , the second flow outlet  212 , and the third flow outlet  213  are different from each other, such that the airflow from the first air outlet  11  is directed to different directions to meet different requirements. 
     Further, in some embodiments, the first flow outlet  211  gradually enlarges in a direction away from the first air outlet  11 , such that the airflow from the first air outlet  211  can flow out from multiple directions, thereby dissipating heat from heat generation elements in different directions. 
     In some embodiments, the heat conduction member  2  is further provided with an air inlet, and the air inlet cooperates with the first air outlet  11 , such that the airflow from the first air outlet  11  can be introduced into the heat conduction member  2 . The airflow from the first air outlet  11  flows into the heat conduction member  2  through the air inlet, and then flows out from the plurality of flow outlets  21 . In some embodiments, the air inlet is provided at an end of the heat conduction member  2  close to the first air outlet  11 , and the plurality of flow outlets  21  is provided at an end of the heat conduction member  2  away from the first air outlet  11 . 
     In various embodiments, the heat dissipation assembly may include one or more air inlets, and the specific number of the one or more air inlets may be determined according to the shape of the electronic device, the heat dissipation requirement of the electronic device, or the distribution of the heat generation elements. Further, the number of the one or more air inlets may be same as or different from the number of the plurality of flow outlets  21 . 
     In some embodiments, as illustrated in  FIG. 2 , the heat conduction member  2  includes a main body  22  connected to the fan  1  and at least three barriers provided at the main body  22 . Each barrier extends from an end of the main body  22  close to the first air outlet  11  to another end of the main body  22  away from the first air outlet  11 . An airflow channel is formed between every two adjacent barriers, and an end of each airflow channel close to the first air outlet  11  forms an airflow inlet. Another end of each airflow channel far away from the first air outlet  11  forms one of the plurality of flow outlets  21 . The airflow flowing out of the first air outlet  11  flows into corresponding one of the airflow channels through each air inlet and fully exchanges heat, and then flows out from one of the plurality of flow outlets  21  corresponding to the airflow channel, to achieve the purpose of heat exchange. 
     Further, as illustrated in  FIG. 2 , the heat conduction member  2  further includes a plurality of heat conduction sheets  23  arranged at the main body  22 . The plurality of heat conduction sheets  23  is arranged at intervals. Each heat conduction sheet  23  of the plurality of heat conduction sheets  23  can be extended from the air inlets (that is, the end of the body  22  close to the first air outlet  11 ) to the plurality of flow outlets  21 , such that a heat exchange area of each heat conduction sheet  23  is large. When the airflow flows through the plurality of heat conduction sheets  23 , it can exchange heat more sufficiently. In some embodiments, the airflow flowing out of the first air outlet  11  flows in through the air inlets, and then flows out from the plurality of flow outlets  21  after flowing through the plurality of heat conduction sheets  23 . The airflow fully contacts the plurality of heat conduction sheets  23  to take away the heat on the plurality of heat conduction sheets  23 , to achieve sufficient heat dissipation. 
     In some embodiments, as illustrated in  FIG. 2 , an extension direction of the plurality of heat conduction sheets  23  is consistent with an extension direction of the barriers. The barriers may be made of a thermally conductive material (such as a thermally conductive metal) or a non-thermally conductive material. In some embodiments, the barriers and the plurality of heat conduction sheets  23  may be a same component. The shape and material of the barriers and the plurality of heat conduction sheets  23  may be same. That is, the barriers may be the plurality of heat conduction sheets  23 . When the air flows through the barriers, the heat on the barriers can be taken away, improving the heat exchange effect. In some other embodiments, the barriers are non-thermally conductive components. 
     The plurality of heat conduction sheets  23  may be arranged in each airflow channel or a portion of the airflow channels. Optionally, the airflow channels may be provided with the plurality of heat conduction sheets  23  arranged at intervals, and sub-airflow channels may be formed between the plurality of heat conduction sheets  23  and between the barriers and a portion of the heat conduction sheets  23 . Correspondingly, the airflow from the first air outlet  11  may flow through these sub-airflow channels, to achieve full heat exchange and improve the utilization rate of the airflow. 
     As illustrated in  FIG. 2 , a side of each heat conduction sheet  23  away from the main body  22  is provided with an auxiliary heat dissipation rib  231 , to increase the heat exchange area. Correspondingly, the heat exchange efficiency of the airflow is further improved. In some embodiments, each auxiliary heat dissipation rib  231  extends from the end of the main body  22  close to the first air outlet  11  to the middle of the corresponding heat conduction sheet  23 , and each auxiliary heat dissipation rib  231  and the corresponding heat conduction sheet  23  form a heat dissipation step. The material of the auxiliary heat dissipation ribs  231  and the material of the plurality of heat conduction sheets  23  may be the same or different. Also, each auxiliary heat dissipation rib  231  may be integrally formed at the corresponding heat conduction sheet  23 , or be connected to the corresponding heat conduction sheet  23 . 
     In various embodiments, the main body  22  may be made of a thermally conductive material (including a thermally conductive metal) or a non-heat conductive material. For example, in some embodiments, the main body  22  may be made of a thermally conductive material. Optionally, the material of the plurality of heat conduction sheets  23  may be same as the material of the main body  22 . The plurality of heat conduction sheets  23  may be integrally formed at the main body  22 , or may be connected to the main body  22  through, e.g., plug connection or lock connection. Further, optionally, the barriers may be made of a material same as the material of the main body  22 . The barriers may be integrally formed at the main body  22 , or may be connected to the main body  22  through, e.g., plug connection or lock connection. 
     In some other embodiments, the main body  22  may be made of a non-thermally conductive material. Optionally, the material of the barriers may be the same as the material of the main body  22 , and the barriers may be integrally formed at the main body  22 , or connected to the main body  22  by, e.g., lock connection or plug connection. The plurality of heat conduction sheets  23  can be connected to the main body  22  by, e.g., lock connection or plug connection. 
     In some embodiments where the plurality of heat conduction sheets  23  is connected to the main body  22 , a manner which is used to connect the plurality of heat conduction sheets  23  to the main body  22  may be selected according to the actual needs. For example, in some embodiments, a plurality of plug interfaces may be formed at the main body  22 , and the plurality of heat conduction sheets  23  may be matched with the plurality of plug interfaces one by one. The plurality of plug interfaces may be through holes or plug slots, which can be selected according to the actual needs. 
     As illustrated in  FIG. 2 , the fan  1  includes a casing  13  and fan blades  14  arranged at the casing  13 . The casing  13  is connected to the main body  22 . In some embodiments, the first air outlet  11  of the fan  1  is provided at the housing  13 . When the fan  1  is working, the airflow generated by the rotation of the fan blades  14  is led out from the first air outlet  11  and enters the airflow channels on the heat conduction member  2 . 
     In some embodiments, the housing  13  is a thermally conductive component, that is, the housing  13  is made of a thermally conductive material (such as a thermally conductive metal). In some embodiments, the fan  1  not only functions as a wind source power, but also has a heat conduction function and directly participates in heat conduction. Specifically, when the fan  1  is in use, the housing  13  can directly or indirectly contact the heat generation elements in the electronic device, to conduct heat, absorb the heat on the heat generation element and further improve the heat dissipation efficiency. The housing  13  can be made of a thermally conductive material with higher thermal conductivity which can be specifically selected according to needs, and this disclosure does not specifically limit this. 
     The fan  1  further includes a first air inlet  12 . When the heat dissipation assembly  300  is installed in the electronic device, the first air inlet  12  can be matched with the air inlet member  130  of the electronic device or the gap on the housing of the electronic device, to suck in the external airflow. The airflow then is exported from the first air outlet  11 . 
     In various embodiments, the fan  1  can be a centrifugal fan or another type of fan. 
     To reduce the impact of the vibration generated during the operation of the fan  1  on the heat conduction member  2 , the heat dissipation assembly  300  further includes a damping member  3 . The damping member  3  is arranged at the junction of the housing  13  and the main body  22 . In some embodiments, the housing  13  and the main body  22  are connected by the damping member  3 . Correspondingly, the main body  22  is less affected by the vibration of the fan  1 , thereby reducing the influence of the main body  22  on some heat generation elements of the electronic device that are sensitive to vibration. 
     Specifically, as illustrated in  FIG. 2 , the housing  13  is provided with a fixed end  13   a , and the main body  22  is provided with a first mounting member  221 . In some embodiments, the first mounting member  221  is connected to the fixed end  13   a , and the damping member  3  is disposed between the first mounting member  221  and the fixed end  13   a . Specifically, the first mounting member  221  is a plug-in portion, and the fixed end  13   a  is a plug-in slot. The plug-in portion and the plug-in slot may be plug to match, and the damping member  3  is sleeved on the plug-in portion. 
     To improve the stability of the connection between the housing  13  and the main body  22 , a plurality of fixed ends  13   a  may be provided. For example, two fixed ends  13   a  may be provided, and the two fixed ends  13   a  may be respectively provided at two sides of the housing  13  respectively. Correspondingly, two first mounting members  221  may be provided and the two first mounting members  221  may be respectively provided at two sides of the main body  22 . The two first mounting members  221  may be connected to the two fixed ends  13   a  respectively. 
     The type of the damping member  3  may be selected according to needs. Optionally, the damping member  3  may be an elastic piece. In some embodiments, the damping member  3  may be made of an elastic material. In other embodiments, the damping member  3  may be an elastic structure including a spring. 
     Further, as illustrated in  FIG. 2 , in some embodiments, the heat dissipation assembly  300  further includes a cover body  24 , and the cover body  24  is disposed at the heat conduction member  2 . Specifically, the cover body  24  and the main body  22  are matched, such that the airflow channels on the heat conduction member  2  form sealed airflow channels. Further, the cover body  24  can have outlets at positions corresponding to the plurality of flow outlets  21  to ensure that the airflow passing through the heat conduction member  2  can flow out from the plurality of flow outlets  21 . 
     The cover body  24  and the main body  22  can be integrally formed, or can be provided separately. In some embodiments, the cover body  24  and the main body  22  are provided separately, and the cover body  24  is provided at the main body  22 . The airflow channels can be sealed in the space formed by the main body  22  and the cover body  24 , thereby ensuring the heat dissipation effect. Further, there is no need to provide a separate external structure to seal the airflow channel, and the structure is simple. 
     Further, as illustrated in  FIG. 2 ,  FIG. 4 , and  FIG. 6 , the cover body  24  is provided with a second mounting member  241 . After the first mounting member  221  passes through the fixing end  13   a , it is fixedly connected to the second mounting member  241 , improving the firmness of the connection between the housing  13  and the main body  22 . Furthermore, the heat dissipation assembly  300  further includes a fastener  4  that fixes the second mounting member  241  on the first mounting member  221  to further improve the firmness of the connection between the housing  13  and the main body  22 . The fastener  4  may be a nut or another fastening structure. 
     The cover body  24  may be made of a thermally conductive material (such as a thermally conductive metal). When the airflow flows through the airflow channels, it can take away the heat on the cover body  24  and further improve the heat dissipation efficiency. 
     In the heat dissipation assembly  300  of the embodiment of the present disclosure, the airflow from the fan  1  may pass through the heat conduction member  2  and then flow out from at least two sets of flow outlets  21  facing different directions. The heat conduction member  2  may absorb heat nearby and the airflow flowing through the heat conduction member  2  may fully contact the heat conduction member  2  to fully exchange heat, improving the utilization rate of the airflow and enhancing the heat exchange effect. Further, the airflow from the plurality of flow outlets  21  may also directly dissipate the heat generated by the main heat generation elements in the electronic device, and the heat dissipation efficiency may be high. The heat dissipation assembly  300  of the present disclosure may use the airflow for heat dissipation more efficiently and evenly. 
     The heat dissipation assembly  300  provided by various embodiments of the present disclosure may be applied to various electronic devices or structures that require heat dissipation. For example, in some embodiments, as illustrated in  FIG. 3  to  FIG. 5 , the heat dissipation assembly  300  is applied to a circuit board  200 . The heat generated by various electronic components on the circuit board  200  is dissipated. In other embodiments, the heat dissipation assembly  300  may be applied to electronic devices including unmanned aerial vehicles or remote-control vehicles, to dissipate heat of the electronic devices and ensure the normal operation of the electronic devices. 
     In the following, examples where the heat dissipation assembly  300  is applied to a circuit board  200  or an unmanned aerial vehicle are described. 
       FIG. 3  to  FIG. 5  show a heat dissipation device consistent with the disclosure. The heat dissipation device includes a circuit board  200  and a heat dissipation assembly  300  connected to the circuit board  200 . The heat dissipation assembly  300  have structures, functions, working principles and effects similar to the example heat dissipation assembly above, and description thereof will not be repeated here. The circuit board  200  and the heat dissipation assembly  300  are combined to form the heat dissipation device. When the circuit board  200  is subjected to a single test, the heat dissipation assembly  300  can dissipate heat of the circuit board  200  without the need for other air sources or components to assist heat dissipation. 
     In some embodiments, as illustrated in  FIG. 11 , the circuit board  200  includes a first circuit board  210  and a second circuit board  220 . The first circuit board  210  is disposed at one side of the heat dissipation assembly  300 , and the second circuit board  220  is disposed at another side of the heat dissipation assembly  300 . Optionally, the first circuit board  210  is arranged under the fan  1  and the heat conduction member  2  (that is, a side of the main body  22  away from the plurality of heat conduction sheets  23 ), and the second circuit board  220  is arranged above the heat conduction member  2 . 
     The arrangement of the heat dissipation assembly  300  and the first circuit board  210  can be selected according to needs. For example, in some embodiments, the first circuit board  210  may be attached to one side of the heat dissipation assembly  300 . In some embodiments, the first circuit board  210  may be attached below the housing  13  of the fan  1  and the main body  22  of the heat conduction member  2 . Correspondingly, the heat dissipation assembly  300  can better dissipate the heat on the first circuit board  210 . In another embodiment, the first circuit board  210  may be disposed below the heat dissipation component  300  at a first interval from the heat dissipation assembly  300 . The smaller the first interval is, the better the heat dissipation effect of the heat dissipation assembly  300  on the first circuit board  210  is achieved. For example, the first interval may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. 
     The arrangement of the heat dissipation assembly  300  and the second circuit board  220  can be selected according to needs. For example, in some embodiments, the second circuit board  220  may be attached to another side of the heat dissipation assembly  300 . In some embodiments, the second circuit board  220  may be attached above the housing  13  of the fan  1  and the main body  22  of the heat conduction member  2 . Correspondingly, the heat dissipation assembly  300  can better take away the heat on the second circuit board  220 . In another embodiment, the second circuit board  220  may be disposed below the heat dissipation component  300  at a second interval from the heat dissipation assembly  300 . The smaller the second interval is, the better the heat dissipation effect of the heat dissipation assembly  300  on the second circuit board  220  is achieved. For example, the second interval may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. 
     In some embodiments, the heat dissipation assembly  300  is connected to the first circuit board  210 . Specifically, the main body  22  of the heat dissipation assembly  300  is connected to the first circuit board  210 . In some embodiments, the damping member  3  of the heat dissipation assembly  300  is arranged between the housing  13  and the first circuit board  210 . The damping member  3  can reduce the vibration force transmitted by the fan  1  to the first circuit board  210 , thereby reducing the impact on some functional devices  204  on the first circuit board  210  that are sensitive to vibration. As illustrated in  FIG. 6 , the first circuit board  210  is provided with a positioning member  205 , and the positioning member  205  is plug and connected to the first mounting member  221  on the main body  22 . The first mounting member  221  is connected to the fixed end  13   a  on the housing  13 . The damping member  3  on the heat dissipation assembly  300  is arranged between the first mounting member  221  and the fixed end  13   a . In some embodiments, the positioning member  205  is a positioning protrusion, and the first mounting member  221  is provided with a mounting hole. The positioning protrusion is inserted into the mounting hole. 
     Further, in some embodiments, the heat dissipation assembly  300  and the second circuit board  220  are also connected. Specifically, the main body  22  of the heat dissipation assembly  300  is connected to the second circuit board  220 , and the means for connecting the main body  22  and the second circuit board  220  can be any proper connection means. The heat dissipation assembly  300  is connected to the first circuit board  210  and the second circuit board  220  respectively to form an integral structure. 
     In some embodiments, the first circuit board  210  and a second circuit board  220  are respectively provided with a plurality of functional devices  204  that generate heat. The functional devices  204  may include chips, sensors, and the like. In some embodiments, the functional devices  204  may be chips, for example, including a control chip or a driver chip. 
     As illustrated in  FIG. 4 , in some embodiments, the first circuit board  210  includes a first area  201 , a second area  202 , and a third area  203 . The fan  1  of the heat dissipation assembly  300  cooperates with the first area  201 , the plurality of heat conduction sheets  23  of the heat conduction member  2  cooperates with the second area  202 , and the at least one flow outlet  21  of the plurality of flow outlets  21  cooperates with the third area  203 . In some embodiments, the fan  1  is made of a thermally conductive material, and the fan  1  is in contact with the first area  201  to conduct heat generated by the first area  201  to the heat conduction member  2 . Specifically, the housing  13  of the fan  1  directly or indirectly contacts the functional devices  204  in the first area  201 , to conduct the heat generated by the first area  201  to the heat conduction member  2 . Further, in some embodiments, the heat conduction member  2  is in contact with the second area  202  to conduct heat conduction generated by the second area  202  and conduct the heat to the plurality of flow outlets  21 . Specifically, the heat conduction member  2  directly or indirectly contacts the functional devices  204  in the second area  202  through the plurality of heat conduction sheets  23  and/or the main body  22  to conduct heat generated in the second area  202  and conduct the heat to the plurality of flow outlets  21 . The airflow from the plurality of air outlets  21  flows directly or at intervals to the third area  203  to dissipate heat from the functional devices  204  in the third area  203 . 
     To increase the heat dissipation speed in the third area  203 , in some embodiments, at least one set of the plurality of flow outlets  21  may be aligned with the third area  203 . Correspondingly, the third area  203  may be directly aligned with at least one flow outlet  21  of the plurality of flow outlets  21  and have high heat dissipation efficiency. In another embodiment, at least one flow outlet  21  of the plurality of flow outlets  21  may be arranged close to the third area  203 , thereby increasing the heat dissipation speed of the third area  203 . 
     Specifically, the airflow from the first flow outlet  211  of the heat dissipation assembly  300  may be aligned with or close to the third area  203 . 
     When the heat of the second circuit board  220  is dissipated by the heat dissipation assembly  300 , the plurality of heat conduction sheets  23  and/or the main body  22  of the heat conduction member  2  may be in contact with the second circuit board  220  to conduct the heat generated by the second circuit board  220  to the plurality of flow outlets  21 . Specifically, the heat conduction member  2  may directly or indirectly contact the functional devices  204  on the second circuit board  220  through the plurality of heat conduction sheets  23  and/or the main body  22 , to conduct the heat generated by the second circuit board  220  to the plurality of flow outlets  21 . 
     In some embodiments, the heat dissipation device can be a part of the unmanned aerial vehicle. Optionally, the first circuit board  210  may be a main control board of the unmanned aerial vehicle, and the second circuit board  220  may be a motor drive circuit board of the unmanned aerial vehicle. 
     In the heat dissipation device of the present disclosure, the airflow from the fan  1  may pass through the heat conduction member  2  and then flow out from at least two sets of the plurality of flow outlets  21  facing different directions. On the one hand, the heat conduction member  2  may absorb the heat generated by the circuit board  200 , and the airflow flowing through the heat conduction member  2  may fully contact the heat conduction member  2  to achieve a fully heat exchange. The utilization rate of the airflow may be improved and the heat exchange effect may be enhanced. On the other hand, the airflow flowing out from the plurality of flow outlets  21  may also directly dissipate the heat generated by the main heat generation elements in the electronic device, and the heat dissipation efficiency may be high. The heat dissipation assembly  300  of the present invention can use the airflow for heat dissipation more efficiently and evenly. 
       FIG. 7  to  FIG. 11  show an unmanned aerial vehicle consistent with the disclosure. The unmanned aerial vehicle includes a vehicle body  100 , a circuit board  200 , and a heat dissipation assembly  300  connected to the circuit board  200 . Further, the vehicle body  100  has a receiving space  110 , and the circuit board  200  and the heat dissipation assembly  300  are both received in the receiving space  110 . For the structure, function, working principle and effect of the heat dissipation assembly  300 , reference can be made to the description of the heat dissipation assembly  300  above. 
     In some embodiments, the vehicle body  100  is provided with airflow exits  120 . The airflow from the first air outlet  11  of the heat dissipation assembly  300  flows through the heat conduction member  2  and the plurality of flow outlets  21 , and then exits the vehicle body  100  through the airflow exits  120 , such that the heat in the receiving space  110  is taken away. 
     In some embodiments, a number of the airflow exits  120  may be, for example, two, three, or more than three. The multiple airflow exits  120  cooperate with the flow outlets  21 , and the airflow from the flow outlets  21  is led to the outside of the vehicle body through the airflow exits  120 . Specifically, the airflow exits  120  includes a first airflow exit  121 , a second airflow exit  122 , and a third airflow exit  123 , which are respectively connected to the first air outlet  211 , the second air outlet  212 , and the third air outlet  213  of the heat dissipation assembly  300 . 
     As illustrated in  FIG. 8  and  FIG. 11 , the vehicle body  100  includes a first sidewall  140 , a second sidewall  150 , and a third sidewall  160 . The first sidewall  140  is located at the rear of the vehicle body  100 , and the second sidewall  150  and the third sidewall  160  are located on two sides of the first sidewall  140 , respectively. The first airflow exit  121  is opened on the first sidewall  140 , the second airflow exit  122  is opened on the side of the second sidewall  150  near the rear of the vehicle body  100 , and the third airflow exit  123  is opened on a side of the third sidewall  160  close to the rear of the vehicle body  100 . The positions where the first airflow exit  121 , the second airflow exit  122 , and the third airflow exit  123  are arranged at the vehicle body  100  are not limited to this. In various embodiments, the positions of the first airflow exit  121 , the second airflow exit  121  and the second airflow exit  123  on the vehicle body  100  may be configured according to actual needs. 
     In various embodiments, the unmanned aerial vehicle may include a plurality of first airflow exits  121 , and/or a plurality of second airflow exits  122 , and/or a plurality of third airflow exits  123 . For example, in some embodiments, two first airflow exits  121  may be provided at two sides of the first sidewall  140 , respectively. Three second airflow exits  122  may be provided at the second sidewall  150 , and may cooperate with the second flow outlet  212  to direct the airflow from the second flow outlet  212  to the outside of the vehicle body  100 . Three third airflow exits  123  may be formed at the third sidewall  160  at intervals, and all of the three third airflow exits  123  may cooperate with the third flow outlet  213  to direct the airflow from the third flow outlet  213  to the outside of the vehicle body  100 . 
     There may be multiple types of the airflow exits  120 . For example, in some embodiments, each airflow exit  120  may include a plurality of second air outlets (the second air outlets may be circular, square or other shapes). In other embodiments, the airflow exits  120  may also be a grid structure. 
     As illustrated in  FIG. 11 , the vehicle body  100  includes a main body  101 , an upper cover  102  disposed above the main body  101 , a lower cover  103  disposed below the main body  101 , a front cover  104  disposed in front of the main body  101 , and a rear cover  105  disposed behind the main body  101 . The main body  101 , the upper cover  102  and the lower cover  103  surround and form the receiving space  110 . The first sidewall  140  is formed by the main body  101  and the back cover  105 . The second sidewall  150  and the third sidewall  160  are located on two sides of the main body  101 , respectively. The composition of the vehicle body  100  is not limited to the above manner. 
     In some embodiments, as illustrated in  FIG. 11 , the circuit board  200  includes a first circuit board  210  and a second circuit board  220 . The first circuit board  210  is disposed at one side of the heat dissipation assembly  300 , and the second circuit board  220  is disposed at another side of the heat dissipation assembly  300 . Optionally, the first circuit board  210  is arranged under the fan  1  and the heat conduction member  2  (that is, a side of the main body  22  away from the plurality of heat conduction sheets  23 ), and the second circuit board  220  is arranged above the heat conduction member  2 . 
     The arrangement of the heat dissipation assembly  300  and the first circuit board  210  can be selected according to needs. For example, in some embodiments, the first circuit board  210  may be attached to one side of the heat dissipation assembly  300 . In some embodiments, the first circuit board  210  may be attached below the housing  13  of the fan  1  and the main body  22  of the heat conduction member  2 . Correspondingly, the heat dissipation assembly  300  can better take away the heat on the first circuit board  210 . In another embodiment, the first circuit board  210  may be disposed below the heat dissipation component  300  at a first interval from the heat dissipation assembly  300 . The smaller the first interval is, the better the heat dissipation effect of the heat dissipation assembly  300  on the first circuit board  210  is achieved. For example, the first interval may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. 
     The arrangement of the heat dissipation assembly  300  and the second circuit board  220  can be selected according to needs. For example, in some embodiments, the second circuit board  220  may be attached to another side of the heat dissipation assembly  300 . In some embodiments, the second circuit board  220  may be attached above the housing  13  of the fan  1  and the main body  22  of the heat conduction member  2 . Correspondingly, the heat dissipation assembly  300  can better take away the heat on the second circuit board  220 . In another embodiment, the second circuit board  220  may be disposed below the heat dissipation component  300  at a second interval from the heat dissipation assembly  300 . The smaller the second interval is, the better the heat dissipation effect of the heat dissipation assembly  300  on the second circuit board  220  is achieved. For example, the second interval may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. 
     In some embodiments, the heat dissipation assembly  300  is connected to the first circuit board  210 . Specifically, the main body  22  of the heat dissipation assembly  300  is connected to the first circuit board  210 . In some embodiments, the damping member  3  of the heat dissipation assembly  300  is arranged between the housing  13  and the first circuit board  210 . The damping member  3  can reduce the vibration force transmitted by the fan  1  to the first circuit board  210 , thereby reducing the impact on some functional devices  204  on the first circuit board  210  that are sensitive to vibration. As illustrated in  FIG. 6 , the first circuit board  210  is provided with a positioning member  205 , and the positioning member  205  is plug and connected to the first mounting member  221  on the main body  22 . The first mounting member  221  is connected to the fixed end  13   a  of the housing  13 . The damping member  3  on the heat dissipation assembly  300  is arranged between the first mounting member  221  and the fixed end  13   a . In some embodiments, the positioning member  205  is a positioning protrusion, and the first mounting member  221  is provided with a mounting hole. The positioning protrusion is inserted into the mounting hole. 
     Further, after the heat dissipation assembly  300  is connected to the first circuit board  210  and the second circuit board  220  respectively to form an integral structure, the first circuit board  210  may be connected to the inner sidewall of the vehicle body  100  using any proper connection manner. 
     Further, the second circuit board  220  may be connected to the inner sidewall of the vehicle body  100  using any proper connection manner. 
     In some embodiments, the first circuit board  210  and a second circuit board  220  are respectively provided with a plurality of functional devices  204  that generate heat. The functional devices  204  may include chips, sensors, and the like. In some embodiments, the functional devices  204  may be chips, for example, including a control chip or a driver chip. 
     As illustrated in  FIG. 4 , in some embodiments, the first circuit board  210  includes a first area  201 , a second area  202 , and a third area  203 . The fan  1  of the heat dissipation assembly  300  cooperates with the first area  201 , the plurality of heat conduction sheets  23  of the heat conduction member  2  cooperates with the second area  202 , and the at least one flow outlet  21  of the plurality of flow outlets  21  cooperates with the third area  203 . In some embodiments, the fan  1  is made of a thermally conductive material, and the fan  1  is in contact with the first area  201  to conduct heat generated by the first area  201  and conduct the heat to the heat conduction member  2 . Specifically, the housing  13  of the fan  1  directly or indirectly contacts the functional devices  204  in the first area  201 , to achieve heat conduction of the heat generated in the first area  201  and conduct the heat to the heat conduction member  2 . Further, in some embodiments, the heat conduction member  2  is in contact with the second area  202  to achieve heat conduction generated by the second area  202  and conduct the heat to the at least one flow outlet  21 . Specifically, the heat conduction member  2  directly or indirectly contacts the functional devices  204  in the second area  202  through the plurality of heat conduction sheets  23  and/or the main body  22  to conduct heat generated in the second area  202  to the at least one flow outlet  21 . The airflow from the at least one flow outlet  21  flows directly or indirectly to the third area  203  to dissipate heat from the functional devices  204  in the third area  203 . 
     To increase the heat dissipation speed in the third area  203 , in some embodiments, at least one set of the plurality of flow outlets  21  may be aligned with the third area  203 . Correspondingly, the third area  203  may be directly aligned with at least one flow outlet  21  of the plurality of flow outlets  21  and have high heat dissipation efficiency. In another embodiment, at least one flow outlet  21  of the plurality of flow outlets  21  may be arranged close to the third area  203 , thereby increasing the heat dissipation speed of the third area  203 . 
     Specifically, in some embodiments, the airflow from the first flow outlet  211  of the heat dissipation assembly  300  may be aligned with or close to the third area  203 . 
     When the heat of the second circuit board  220  is dissipated by the heat dissipation assembly  300 , the plurality of heat conduction sheets  23  and/or the main body  22  of the heat conduction member  2  may be in contact with the second circuit board  220  to conduct the heat generated by the second circuit board  220  to the flow outlets  21 . Specifically, the heat conduction member  2  may directly or indirectly contact the functional devices  204  on the second circuit board  220  through the plurality of heat conduction sheets  23  and/or the main body  22 , to conduct the heat generated by the second circuit board  220  to the plurality of flow outlets  21 . 
     In some embodiments, the unmanned aerial vehicle may include a main control board and a motor drive circuit board. During the flight of the unmanned aerial vehicle, the main control board and the motor drive circuit board may be the main heat generating sources in the receiving space  110 . Optionally, the first circuit board  210  is the main control board, and the second circuit board  220  is the motor drive circuit board, such that the heat generated by the main control board and the motor drive circuit board are dissipated through the heat dissipation assembly  300  to prevent a large amount of heat accumulation in the receiving space  110 . When the unmanned aerial vehicle is an unmanned plane, the main control board is the flight controller of the unmanned plane. 
     Further, the circuit board  200  may further include a third circuit board  230 . The third circuit board  230  may include an inertial measurement module (IMU) and/or a GPS module, to acquire posture information and location information of the unmanned aerial vehicle. The third circuit board  230  may also be fixedly connected to the inner sidewall of the vehicle body  100 . 
     In some embodiments, the first airflow exit  121  may be connected to the receiving space  110 . The first flow outlet  211  and the first airflow exit  121  may be disposed alternately, and the third area  203  of the first circuit board  210  may be disposed between the first airflow exit  121  and the first flow outlet  211 . The airflow flowing out from the first air outlet  211  may pass through the third area  203  and then be led out by the first airflow exit  121 . To better dissipate heat in the third area  203  of the first circuit board  210 , the size of the first flow outlet  211  in some embodiments may match the third area  203 . 
     Further, the second airflow exit  122  is connected to the second flow outlet  212 . Correspondingly, the second flow outlet  212  is connected to the second airflow exit  122 , and the airflow from the second flow outlet  212  is directly led out through the second airflow exit  122 . The third airflow exit  123  is connected to the third flow outlet  213 . Correspondingly, the third flow outlet  213  is connected to the third airflow exit  123 , and the airflow from the third flow outlet  213  is directly led out by the third airflow exit  123 . Optionally, the second flow outlet  212  and the second airflow exit  122 , and the third flow outlet  213  and the third airflow exit  123  are all hermetically connected, such that the airflow through the second flow outlet  212  and the third flow outlet  213  may be led to outside of the vehicle body  100  as much as possible. 
     In some embodiments, as illustrated in  FIG. 7  to  FIG. 10 , the vehicle body  100  is also provided with one or more air inlet members  130 . Further referring to  FIG. 2 , the fan  1  includes the first air inlet  12 , and the first air inlet  12  cooperates with the one or more air inlet member s  130 , such that the airflow outside the vehicle body  100  enters the first air inlet  12  from the one or more air inlet members  130 . 
     The one or more air inlet members  130  may be include a plurality of air inlet members  130 , such as two, three, four or more. In some embodiments, one or more of the air inlet members  130  may be provided at a side of the second sidewall  150  away from the rear of the vehicle body  100 , and a remaining air inlet member(s)  130  may be provided at a side of the third sidewall  160  away from the rear of the vehicle body  100 . Optionally, the fan  1  may include a plurality of first air inlets  12 , for example, two, three, four or more first air inlets  12 . 
     The air inlet members  130  may be of different types. For example, in some embodiments, each air inlet member  130  may include a plurality of second air inlets (the second air inlets may be circular, square, or another shape). In some other embodiments, each air inlet member  130  may also be a grid structure or a gap at the connection of the housing for mounting the vehicle body  100 . 
     In some embodiments, as illustrated in  FIG. 11 , the unmanned aerial vehicle further includes a plurality of arms  400  connected to the outer sidewall of the vehicle body  100  and a propeller connected to each arm  400 , which drives the vehicle body  100  to move. 
     As shown in  FIG. 11 , the unmanned aerial vehicle further includes a gimbal  500  connected to the front cover  104 , and the gimbal  500  may be used to carry a camera device. The gimbal  500  can be a two-axis gimbal or a three-axis gimbal. The camera device may be an image capture device or a photographing device (such as a camera, a camcorder, an infrared camera device, an ultraviolet camera device, or the like), an audio capture device (for example, a parabolic reflection microphone), an infrared camera device, etc. The camera device can provide static sensing data (such as pictures) or dynamic sensing data (such as videos). The camera device may be mounted on the gimbal  500 , such that the gimbal  500  controls the rotation of the camera device. 
     As shown in  FIG. 11 , the unmanned aerial vehicle further includes a battery assembly  600  arranged at the vehicle body  100  to supply power to the unmanned aerial vehicle. In some embodiments, a storage slot may be provided at the side of the front cover  104  away from the storage space  110 , and the battery assembly  600  may be fixed in the storage slot. 
     In various embodiments, the unmanned aerial vehicle may be an unmanned plane or another type of remote aerial vehicle. 
     In the present disclosure, the heat dissipation assembly  300  may be disposed in the receiving space  110 . The airflow from the fan  1  in the heat dissipation assembly  300  may pass through the heat conduction member  2  and then flow out from at least two sets of flow outlets  21  facing different directions. On the one hand, the heat conduction member  2  may absorb the heat generated by the circuit board  200 , and the airflow flowing through the heat conduction member  2  may fully contact the heat conduction member  2  to achieve a sufficient heat exchange. The utilization rate of the airflow may be improved and the heat exchange effect may be enhanced. On the other hand, the airflow flowing out from the flow outlets  21  can also directly dissipate the heat generated by the main heat generation elements in the electronic device, and the heat dissipation efficiency may be high. The heat dissipation assembly  300  of the present disclosure can use airflow for heat dissipation more efficiently and evenly. 
     In the present disclosure, “up” and “down” should be understood as the “up” and “down” of the heat dissipation device formed by mounting the second circuit board  220 , the heat dissipation assembly  300 , and the first circuit board  210  from top to bottom. 
     In this disclosure, terms such as “first” and “second” are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply existence of any such relationship or sequence among these entities or operations. The terms “include,” “comprise” or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. If there are no more restrictions, the element associated with “including a . . . ” does not exclude the existence of other identical elements in the process, method, article, or device that includes the element. 
     Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. It is intended that the specification and examples be considered as example only and not to limit the scope of the disclosure, with a true scope and spirit of the invention being indicated by the following claims.