Electric tool

Abstract

An electric tool, comprising an operation assembly configured to perform operations of the electric tool; a driving assembly which comprises an electric motor and is configured to drive the operation assembly; a power supply assembly which is configured to supply electric energy to the driving assembly; and a control assembly which is configured at least to control the operation of the electric motor. The control assembly comprises a first circuit board and at least one heat dissipation element, wherein the first circuit board comprises at least one power element; and the heat dissipation element comprises a main body portion which is in thermal contact with the surface of the power element, and a first connecting portion which is connected to the main body portion, the first connecting portion being electrically connected to the first circuit board.

Description

power tools

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 20, 2023, with application number 202311767477.8, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of tool technology, for example, to an electric tool. Background Art

[0003] Power tools are more environmentally friendly than engine-powered tools, leading to their widespread use. Power tools generally use a motor to drive their work. The power tool is equipped with a circuit board that controls the motor. This circuit board is equipped with multiple metal-oxide-semiconductor field-effect transistors (MOSFETs), and the motor is electrically connected to the circuit board via motor cables.

[0004] When a power tool is operating, heat is generated on the circuit board and at the electrical connections between the MOS transistors on the circuit board and the motor wires. The higher the operating current of the power tool, the more heat the MOS transistors on the circuit board generate, and the higher the temperature of the MOS transistors. If the MOS transistors have poor heat dissipation, they will remain at a high temperature, causing the circuit board and the power tool to malfunction.

[0005] This section provides background information related to the present application which is not necessarily prior art. Summary of the Invention

[0006] The present application provides an electric tool with good heat dissipation performance.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] An electric tool comprises: a working component for performing the work of the electric tool; a driving component including a motor for driving the working component; a power supply component for providing power to the driving component; a control component for at least controlling the operation of the motor; the control component comprises: a first circuit board and at least one heat dissipation element; the first circuit board comprises at least one power element; the heat dissipation element comprises: a main body for forming thermal contact with the surface of the power element; a first connecting portion connected to the main body, the first connecting portion being electrically connected to the first circuit board.

[0009] In some embodiments, the heat dissipation element further includes a second connecting portion, a first end of the second connecting portion is connected to the main body portion, and a second end of the second connecting portion is used to be connected to a motor wire of the motor.

[0010] In some embodiments, the second connection portion extends outward in a direction opposite to the first connection portion.

[0011] In some embodiments, the first connecting portion is at least partially located below the main body portion, and the second connecting portion is at least partially located above the main body portion.

[0012] In some embodiments, the main body is located above the power component, and the main body is in thermal contact with the surface of the power component via thermal conductive adhesive.

[0013] In some embodiments, the control assembly further includes a second circuit board, which is located above the heat dissipation element and in contact with the main body.

[0014] In some embodiments, the heat dissipation element further includes a second connecting portion, the control assembly further includes a second circuit board, and the second connecting portion is located on a side of the second circuit board.

[0015] In some embodiments, the control assembly further includes a heat dissipation box, one side of the heat dissipation box is in contact with the first circuit board, and the other side of the heat dissipation box is provided with a plurality of heat dissipation fins.

[0016] In some embodiments, the heat dissipation element is a copper element.

[0017] In some embodiments, the power element is a MOS transistor.

[0018] In some embodiments, the power tool includes multiple power elements, each preset power element is defined as a power element group, the number of heat dissipation elements is the same as the number of power element groups, and each heat dissipation element corresponds to a power element group.

[0019] In some embodiments, each heat dissipation component is electrically connected to a center position of a corresponding group of power components.

[0020] In some embodiments, the first connecting portion has an area greater than or equal to 25 mm 2 plane.

[0021] In some embodiments, the electric tool is an electric tool with a power greater than or equal to 1200W.

[0022] In some embodiments, the operating current of the power tool is greater than or equal to 20A.

[0023] In some embodiments, an electric tool includes: a working component for performing the work of the electric tool; a driving component including a motor for driving the working component; a power supply component for providing power to the driving component; a control component for at least controlling the operation of the motor; the control component includes: a first circuit board, at least one heat dissipation element and a heat dissipation box; one side of the first circuit board is electrically connected to the heat dissipation element, and the other side of the first circuit board is in contact with the heat dissipation box.

[0024] In some embodiments, the first circuit board includes at least one power element, and the heat dissipation element includes a first connecting portion and a main body portion; when the first connecting portion is electrically connected to the first circuit board, the main body portion is in thermal contact with the surface of the power element.

[0025] In some embodiments, the heat dissipation element further includes a second connecting portion, a first end of the second connecting portion is connected to the main body portion, and a second end of the second connecting portion is used to be connected to a motor wire of the motor.

[0026] In some embodiments, an electric tool includes: a working component for performing the work of the electric tool; a driving component including a motor for driving the working component; a power supply component for providing power to the driving component; a control component for at least controlling the operation of the motor; the control component includes: a first circuit board and at least one heat dissipation element; the heat dissipation element includes a first connecting part, a main body and a second connecting part, and the first connecting part and the second connecting part are both connected to the main body; the first connecting part is used to electrically connect to the first circuit board, and the second connecting part is used to connect to the motor line of the motor; wherein the first connecting part and the second connecting part extend in opposite directions in a direction perpendicular to the main body.

[0027] In some embodiments, the first circuit board includes at least one power component, and the main body is in thermal contact with a surface of the power component.

[0028] The present application uses a heat dissipation element to form thermal contact with the surface of the power element, so that the power element is cooled by the heat dissipation element, thereby improving the heat dissipation effect of the heat dissipation element and further improving the heat dissipation performance of the power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a perspective view of a backpack hair dryer according to an embodiment;

[0030] FIG2 is a rear view of the backpack hair dryer in FIG1 ;

[0031] FIG3 is a perspective view of the connection between the motor and the control assembly in FIG1 ;

[0032] FIG4 is a perspective view of a control assembly according to an embodiment;

[0033] FIG5 is a perspective exploded view of the control assembly in FIG4 ;

[0034] FIG6 is a perspective view of a control assembly according to an embodiment;

[0035] FIG7 is a front view of the heat dissipation element of the control assembly in FIG4;

[0036] FIG8 is a top view of the control assembly in FIG4;

[0037] FIG9 is a front view of the control assembly in FIG4 ;

[0038] FIG10 is an exploded perspective view of a control assembly according to an embodiment;

[0039] FIG. 11 is an exploded perspective view of a control assembly according to an embodiment. DETAILED DESCRIPTION

[0040] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0041] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0042] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0043] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0044] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0045] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0046] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0047] The power tools to which the technical solutions of this application apply include handheld power tools, fastening power tools, cutting power tools, grinding power tools, and the like. Examples include hair dryers, electric drills, electric circular saws, reciprocating saws, impact wrenches, impact screwdrivers, and hammer drills. Other types of power tools are also within the scope of protection of this application as long as they can employ the substantive content of the technical solutions disclosed below.

[0048] Electric tools generally use motors to drive their work. A circuit board for controlling the motor is provided in the electric tool, wherein the circuit board includes both a power aluminum substrate and a control board. The power aluminum substrate and the control board can be on the same layer or on two layers, that is, the control board can be located above the power aluminum substrate. In order to reduce the volume of the space where the two circuit boards are located, the control board is usually located above the power aluminum substrate. The power aluminum substrate includes multiple MOS tubes to control the operation of the motor. The motor wires of the motor are usually electrically connected in the middle of the power aluminum substrate. When the motor wires pass outward, they need to pass through the control board. In order to ensure the function of the control board, the control board needs to be enlarged, which increases the volume of the entire circuit board. At the same time, heat is generated at the electrical connection between the motor wire and the power aluminum substrate, and the MOS tube generates heat. When the working current or working power of the electric tool is large, the heat generated by the MOS tube will be more. If the heat dissipation of the MOS tube and the electrical connection between the motor wire and the power aluminum substrate is insufficient, the electric tool will not work properly. Based on this, the present application provides an electric tool with better heat dissipation performance.

[0049] As shown in Figures 1 and 2, the present application provides a power tool 100, which implements the corresponding functions of the tool through its functional elements. In this embodiment, the power tool 100 takes a backpack hair dryer as an example, which is used by a user to clean fallen leaves on the ground.

[0050] In other embodiments, it will be appreciated that the power tool 100 may also be a handheld power tool, such as a drill, a pruner, a sander, or the like. Alternatively, the power tool 100 may also be a benchtop tool, such as a table saw or a miter saw. Alternatively, the power tool 100 may also be a push power tool, such as a push lawn mower or a push snow blower. Alternatively, the power tool 100 may also be a ride-on power tool, such as a ride-on lawn mower, a ride-on vehicle, an all-terrain vehicle, or the like. Alternatively, the power tool 100 may also be a robotic tool, such as a robotic lawn mower or a robotic snow blower.

[0051] In some embodiments, the power tool 100 may also be a garden tool, such as a pruner, a lawn mower, a chain saw, etc. Alternatively, the power tool 100 may also be a decoration tool, such as a screwdriver, a nail gun, a circular saw, a sander, etc.

[0052] In some embodiments, the power tool 100 may also be a vegetation care tool, such as a lawn mower, a lawn mower, a pruner, a chain saw, etc. Alternatively, the power tool 100 may also be a cleaning tool, such as a hair dryer, a snow blower, a cleaning machine, etc. Alternatively, the power tool 100 may also be a drilling tool, such as a drill, a screwdriver, a wrench, an electric hammer, etc. Alternatively, the power tool 100 may also be a sawing tool, such as a reciprocating saw, a jig saw, a circular saw, etc. Alternatively, the power tool 100 may also be a bench tool, such as a table saw, a miter saw, a metal cutter, an electric milling machine, etc. Alternatively, the power tool 100 may also be a grinding tool, such as an angle grinder, a sander, etc. Alternatively, the power tool 100 may also be other power tools, such as a lamp, a fan, etc.

[0053] The power tool 100 includes a working component 10, which is used to perform the work of the power tool 100. In this embodiment, the work of the power tool 100 is blowing. In addition, the working component 10 can also be used to perform other tasks of other power tools 100, such as weeding, cutting, etc. The driving component 20 is used to drive the working component 10 to operate, wherein the driving component 20 includes a motor. The power supply component 30 is used to provide power to the driving component 20. The control component 40 is used to control the operation of the motor. Among them, the power supply component 30 can be a battery pack or an AC power supply, that is, it can be connected to 120V or 220V AC mains power through the power interface.

[0054] As shown in Figures 1 and 2, the power tool 100 includes a backpack body 50 and a fan assembly 60 connected to the backpack body 50, wherein the fan assembly 60 includes a working assembly 10 and a drive assembly 20. The backpack body 50 is used to be carried on the back of the user, and the fan assembly 60 is used to generate airflow and guide the airflow. The backpack body 50 includes a shell 51, and the shell 51 is detachably provided with a battery pack 52, wherein the battery pack 52 is the power supply assembly 30. A carrying handle 53 is formed at the upper end of the shell 51 to facilitate carrying the shell 51. A shoulder strap 54 is connected to the outside of the shell 51, one end of the shoulder strap 54 is connected to the carrying handle 53, and the other end is snap-connected to the shell 51. The shoulder strap 54 is used to wrap around the user's body so that the user can carry the backpack body 50 on the shoulder.

[0055] The fan assembly 60 includes an air duct 61, which is disposed on one side of the housing 51. The air duct 61 includes an air inlet duct 611, an air outlet duct 612, and a hose 613. One end of the air inlet duct 611 forms an air inlet, and one end of the air outlet duct 612 forms an air outlet. The hose 613 connects the air inlet duct 611 and the air outlet duct 612, and both the air inlet and the air outlet are connected to the outside world. An operating handle 62 is disposed on the outside of the air duct 61, between the air inlet and the air outlet. The user operates the fan assembly 60 by operating the handle 62. Specifically, the operating handle 62 is connected to the air outlet duct 612 and can be operated with one hand. By swinging the operating handle, the user can move the air outlet duct 612, thereby adjusting the airflow direction of the air outlet duct 612. A shock absorber is disposed between the operating handle 62 and the air outlet duct 612 to reduce vibration transmitted from the air outlet duct 612 to the operating handle 62, thereby cushioning the force transmitted between the operating handle 62 and the air outlet duct 612.

[0056] As shown in Figures 2 and 3, the fan assembly 60 also includes a motor 63 and a fan. The fan is arranged in the air duct 61. The fan is driven by the motor 63 to rotate around the pivot axis to generate airflow; the air duct is used to guide the airflow generated by the fan, so that the outside air enters from the air inlet and flows out from the air outlet. With the help of the rotation of the fan, an air flow channel is formed in the air duct. The air inlet and the air outlet are respectively located at the two ends of the air flow channel, and a negative pressure area is formed between the air inlet and the air outlet. The operating handle 62 can control the opening and closing of the motor 63. As shown in Figure 3, the motor 63 includes a plurality of motor wires 631, and the plurality of motor wires 631 are connected to the control component 40. Among them, the number of motor wires 631 can be three as shown in Figure 3.

[0057] The backpack body 50 and the fan assembly 60 are connected by a connecting assembly. Specifically, the connecting assembly connects the outer shell 51 of the backpack body 50 to the air inlet duct 611 of the fan assembly 60. The air inlet duct 611 is configured to rotate relative to the outer shell 51 to facilitate adjusting the air outlet direction of the air outlet duct 612.

[0058] As shown in FIG2 , a housing 51 defines a receiving space 511 below the battery pack 52. The control assembly 40 is disposed within the receiving space 511. As shown in FIG4 , the control assembly 40 comprises a first circuit board 41, a heat dissipation element 42, a second circuit board 43, and a heat dissipation box 44. The first circuit board 41, the heat dissipation element 42, and the second circuit board 43 are all located within the heat dissipation box 44. As shown in FIG5 , from top to bottom, the second circuit board 43, the heat dissipation element 42, and the first circuit board 41 are located in that order.

[0059] In some embodiments, the control assembly 40 includes a first circuit board 41 and at least one heat dissipation element 42. The first circuit board 41 includes at least one power element 411. Multiple power elements 411 may be provided on the first circuit board 41. A predetermined number of power elements 411 is defined as a power element group. The number of heat dissipation elements 42 is the same as the number of power element groups. Each heat dissipation element 42 corresponds to a power element group, and each heat dissipation element 42 dissipates heat for the corresponding power element group. The predetermined number of power elements 411 may be four, as shown in FIG5 , or any other predetermined number of power elements 411 may form a power element group, such as two power elements 411, which is not limited in this application. The first circuit board 41 may be a power aluminum substrate, and the heat dissipation element 42 may be a copper element, such as a copper bar. The power element 411 is a MOS transistor. The power element 411 is used to control the operation of the motor 63. As shown in FIG5 and FIG6 , the number of heat dissipation elements 42 and the number of power element groups may both be three, or any other number, which is not limited in this application.

[0060] As shown in FIG7 , the heat dissipation element 42 includes a main body 421 and a first connection portion 422 . The main body 421 can form thermal contact with the surface of the power element 411 . The first connection portion 422 is connected to the main body 421 . The first connection portion 422 can be electrically connected to the first circuit board 41 . The conductivity of the first connection portion 422 is 50*10^6 to 60*10^6 (S / m). The length of the main body 421 is greater than or equal to 24 mm, and the width is greater than or equal to 8 mm. Specifically, as shown in FIG5 and FIG6 , the heat dissipation element 42 is located above the first circuit board 41 . The lower surface of the main body 421 covers the surface of the power element 411 and forms thermal contact with the surface of the power element 411 . At least a portion of the first connection portion 422 is located below the main body 421 , opposite to the lower surface of the main body 421 . Optionally, the main body 421 can be in thermal contact with the surface of the power element 411 through the thermal conductive adhesive 45, so that the heat emitted by the power element 411 can be transferred to the heat dissipation element 42 through the thermal conductive adhesive 45, and then dissipated through the main body 421 of the heat dissipation element 42. The thermal conductivity of the heat dissipation element 42 is 200 to 400 w / (mk). Since the heat dissipation element 42 is a copper bar, heat can be dissipated simultaneously through the upper and lower surfaces of the copper bar, thereby improving the heat dissipation effect of the power element 411. In addition, the heat conductive element between the power element 411 and the heat dissipation element 42 can also be an element with a heat conductive function other than the thermal conductive adhesive 45, which is not limited in this application. In this embodiment, the heat dissipation function and the conductive function of the heat dissipation element 42 are effectively utilized by the heat dissipation element 42 by forming an electrical connection with the first circuit board 41. Moreover, the first connecting portion 422 that is electrically connected to the first circuit board 41 and the main body 421 that dissipates heat for the power element 411 are different parts of the heat dissipation element 42, so that the heat transfer path between the main body 421 and the power element 411 is shorter and the heat dissipation effect is better.

[0061] Optionally, as shown in FIG8 , each group of power element groups includes four power elements 411 (i.e., four MOS tubes), and these four MOS tubes are arranged symmetrically in pairs in the left-right direction. In order to facilitate the main body 421 to have the same area of ​​thermal contact with each MOS tube, and to facilitate the main body 421 to have the same heat dissipation effect on each MOS tube at the same time, the first connection part 422 is located in the lower part of the main body 421 corresponding to the center position of the lower surface of the main body 421, and the first connection part 422 is electrically connected to the center position of the four MOS tubes, that is, electrically connected to the center position of a group of power element groups on the first circuit board 41. Thus, on both sides of the first connection part 422 are the parts of the two MOS tubes that are in thermal contact with the main body 421. Among them, as shown in FIG6 and FIG7 , the electrical connection point between the first connection part 422 and the first circuit board 41 is a plane, and the area of ​​the plane is greater than or equal to 25mm 2Optionally, the area of ​​the first connecting portion 422 is 28mm 2 Optionally, the area of ​​the first connecting portion 422 is 30 mm 2 Optionally, the area of ​​the first connecting portion 422 is 32 mm 2 Optionally, the area of ​​the first connecting portion 422 is 35mm 2 The contact area between the first connection portion 422 and the first circuit board 41 is increased by the plane, thereby improving the heat dissipation effect at the electrical connection between the first connection portion 422 and the first circuit board 41 .

[0062] As shown in Figure 7, the heat dissipation element 42 also includes a second connecting portion 423. The first end of the second connecting portion 423 is connected to the main body 421, and the second end of the second connecting portion 423 is used to connect to the motor wire 631 of the motor 63. The length of the second connecting portion 423 is greater than or equal to 5 mm, and the width is greater than or equal to 8 mm. The second connecting portion 423 is at least partially located above the main body 421 and connected to the edge of the main body 421. In other words, portions of the second connecting portion 423 and portions of the first connecting portion 422 are located on the upper and lower surfaces of the main body 421, respectively. Specifically, the second connecting portion 423 extends outward in a direction opposite to the first connecting portion 422, that is, the second connecting portion 423 extends upward. Optionally, the second connecting portion 423 can extend outward along a plane A perpendicular to the main body 421 in a direction opposite to the first connecting portion 421, thereby positioning the second connecting portion 423 within the corresponding projected area of ​​the first circuit board 41, thereby avoiding increasing the volume of the space where the control assembly 40 is located. In addition, the second connection portion 423 may also extend outward along a direction forming a certain angle with the plane A in a direction opposite to the first connection portion 421 .

[0063] As shown in Figures 5 and 9, the control assembly 40 also includes a second circuit board 43, which is located above the heat dissipation element 42 and contacts the main body 421. The second circuit board 43 may be a control board, connected to the first circuit board 41, and controls the drive signal of the power element 411. As shown in Figure 9, since the second connection portion 423 is connected to the edge of the main body 421, the second connection portion 423 is located on the side of the second circuit board 43, and the second connection portion 423 does not contact the second circuit board 43. Therefore, when the second connection portion 423 is connected to the motor wire 631 of the motor 63, it will not be interfered with by the second circuit board 43. Since the number of motor wires 631 of the motor 63 is three, the number of heat dissipation elements 42 can also be set to three, so that, as shown in Figure 3, each motor wire 631 is connected to a heat dissipation element 42. Furthermore, because the second connection portion 423 extends outside the second circuit board 43 rather than between the first and second circuit boards 41, 43, the height distance between the first and second circuit boards 41, 43 is reduced, thereby reducing the overall size of the control assembly 40. Furthermore, because the second connection portion 423 extends outside the second circuit board 43, it does not need to pass through the second circuit board 43. This minimizes the area of ​​the second circuit board 43 while maintaining full functionality. This avoids the drawback of the related art where a connection portion needs to pass through the second circuit board 43, occupying a portion of the second circuit board 43 and thus increasing the area of ​​the second circuit board 43.

[0064] As shown in FIG4 , the control assembly further includes a heat sink 44, one side of which contacts the first circuit board 41. That is, as shown in FIG9 , the first circuit board 41, the second circuit board 43, and the heat dissipation element 42 can all be disposed within the heat sink 44. The other side of the heat sink 44 is provided with a plurality of heat sinks, so that the power element 411 can dissipate heat through both the heat dissipation element 42 and the heat sink 44, further enhancing the heat dissipation effect on the power element 411. The heat sink 44 can be a heat sink with unobstructed sides as shown in FIG4 , or a heat sink with obstructed sides, which is not limited in this application.

[0065] In some embodiments, the heat dissipation element 42 can be a first shape as shown in FIG5 , or a second shape as shown in FIG10 . Compared to the heat dissipation element 42 of the first shape, the width of the main body 421 of the heat dissipation element 42 of the second shape is narrower, so that the heat dissipation element 42 of the first shape is suitable for electric tools with relatively high power, and the heat dissipation element 42 of the second shape is suitable for electric tools with relatively low power. The main body 421 of the heat dissipation element 42 of the first shape has a length greater than or equal to 24 mm and a width greater than or equal to 8 mm, and the second connecting portion 423 has a length greater than or equal to 5 mm and a width greater than or equal to 8 mm. The main body 421 of the heat dissipation element 42 of the second shape has a length greater than or equal to 24 mm and a width greater than or equal to 4 mm, and the second connecting portion 423 has a length greater than or equal to 5 mm and a width greater than or equal to 4 mm.

[0066] In some embodiments, the heat dissipation element 42 may also have a third shape, as shown in FIG11 . Compared to the first shape, the main body 421 of the third shape heat dissipation element 42 is wider. In addition to extending outward in the opposite direction from the first connection portion 422, the second connection portion 423 also includes a bend 4231. Specifically, the second connection portion 423 bends upward and inward from the second circuit board 43 after extending beyond the second circuit board 43, thereby increasing the area of ​​the second connection portion 423. This improves the heat dissipation effect of the third shape heat dissipation element 42 and makes it suitable for use in higher-power power tools. The main body 421 of the third shape heat dissipation element 42 is greater than or equal to 24 mm in length and greater than or equal to 10 mm in width. The second connection portion 423 is greater than or equal to 5 mm in length and greater than or equal to 10 mm in width. Furthermore, the specific shape of the heat dissipation element 42 may also be other shapes, which are not limited in this application.

[0067] In some embodiments, the heat dissipation element 42 of the second shape can be applicable to electric tools with a power greater than or equal to 1200 W, or electric tools with an operating current greater than or equal to 20 A, the heat dissipation element 42 of the first shape can be applicable to electric tools with a power greater than or equal to 1800 W, or electric tools with an operating current greater than or equal to 30 A, and the heat dissipation element 42 of the third shape can be applicable to electric tools with a power greater than or equal to 3600 W, or electric tools with an operating current greater than or equal to 60 A. In some embodiments, the heat dissipation element 42 of the second shape can also be applicable to electric tools with a power greater than or equal to 1800 W, or electric tools with an operating current greater than or equal to 30 A, the heat dissipation element 42 of the first shape can also be applicable to electric tools with a power greater than or equal to 2700 W, or electric tools with an operating current greater than or equal to 45 A, and the heat dissipation element 42 of the third shape can also be applicable to electric tools with a power greater than or equal to 4500 W, or electric tools with an operating current greater than or equal to 75 A.

[0068] In the present application, multiple heat dissipation elements composed of copper bars are used to dissipate heat from multiple power elements. For each power element, a heat dissipation element is used to form thermal contact with the surface of the power element, so that the power element is dissipated by the upper and lower surfaces of the heat dissipation element at the same time, thereby improving the heat dissipation effect of the heat dissipation element. At the same time, when the heat dissipation element is electrically connected to the first circuit board, the first connection portion of the heat dissipation element is electrically connected to the first circuit board, thereby increasing the area of ​​the electrical connection between the two and improving the heat dissipation effect at the electrical connection between the two. In addition, the first connection portion that is electrically connected to the first circuit board and the main body that dissipates heat for the power element are different parts of the heat dissipation element. This can shorten the heat transfer path between the main body and the power element and improve the heat dissipation effect.

[0069] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. An electric tool comprising: a working component configured to perform the work of the power tool; A driving assembly, including a motor, configured to drive the working assembly; A power supply component, configured to provide power to the driving component; a control component, configured at least to control the operation of the motor; Wherein, the control component comprises: a first circuit board and at least one heat dissipation element; The first circuit board includes at least one power component; The heat dissipation element comprises: A main body portion, which is in thermal contact with a surface of the power element; The first connecting portion is connected to the main body, and the first connecting portion is electrically connected to the first circuit board.

2. The electric tool according to claim 1, wherein: The heat dissipation element further includes a second connection portion, a first end of the second connection portion is connected to the main body portion, and a second end of the second connection portion is configured to be connected to a motor line of the motor.

3. The electric tool according to claim 2, wherein: The second connection portion extends outwardly in a direction opposite to the first connection portion.

4. The electric tool according to claim 2, wherein: The first connection portion is at least partially located below the main body portion, and the second connection portion is at least partially located above the main body portion.

5. The electric tool according to claim 1, wherein: The main body is located above the power element, and the main body is in thermal contact with the surface of the power element through a heat-conducting adhesive.

6. The electric tool according to claim 1, wherein: The control component also includes a second circuit board, which is located above the heat dissipation element and contacts the main body.

7. The electric power tool according to claim 1, wherein: The heat dissipation element further includes a second connection portion, and the control component further includes a second circuit board, and the second connection portion is located on a side of the second circuit board.

8. The electric tool according to claim 1, wherein: The control component further comprises a heat dissipation box, one side of which is in contact with the first circuit board, and the other side of which is provided with a plurality of heat dissipation fins.

9. The electric tool according to claim 1, wherein: The heat dissipation element is a copper element.

10. The electric power tool according to claim 1, wherein: The power element is a MOS tube.

11. The electric tool according to claim 10, wherein: The electric tool comprises a plurality of the power elements, each preset power element is defined as a power element group, the number of the heat dissipation elements is the same as the number of the power element groups, and each heat dissipation element corresponds to a power element group.

12. The electric power tool according to claim 11, wherein: Each of the heat dissipation components is electrically connected to a center position of a corresponding group of power components.

13. The electric power tool according to claim 1, wherein: The first connecting portion has an area greater than or equal to 25 mm 2 plane.

14. The electric power tool according to claim 1, wherein: The electric tool has a power greater than or equal to 1200W.

15. The electric power tool according to claim 1, wherein: The working current of the electric tool is greater than or equal to 20A.

16. An electric tool comprising: a working component configured to perform the work of the power tool; A driving assembly, including a motor, configured to drive the working assembly; A power supply component, configured to provide power to the driving component; a control component, configured at least to control the operation of the motor; Wherein, the control component comprises: a first circuit board, at least one heat dissipation element and a heat dissipation box; One side of the first circuit board is electrically connected to the heat dissipation element, and the other side of the first circuit board is in contact with the heat dissipation box.

17. The electric power tool according to claim 16, wherein: The first circuit board includes at least one power element, and the heat dissipation element includes a first connecting portion and a main body portion; when the first connecting portion is electrically connected to the first circuit board, the main body portion is in thermal contact with the surface of the power element.

18. The electric power tool according to claim 17, wherein: The heat dissipation element further includes a second connection portion, a first end of the second connection portion is connected to the main body portion, and a second end of the second connection portion is configured to be connected to a motor line of the motor.

19. An electric tool comprising: a working component configured to perform the work of the power tool; A driving assembly, including a motor, configured to drive the working assembly; A power supply component, configured to provide power to the driving component; a control component, configured at least to control the operation of the motor; Wherein, the control component comprises: a first circuit board and at least one heat dissipation element; The heat dissipation element comprises a first connection portion, a main body portion, and a second connection portion, wherein the first connection portion and the second connection portion are both connected to the main body portion; The first connection portion is configured to be electrically connected to the first circuit board, and the second connection portion is configured to be connected to a motor line of the motor; wherein the first connection portion and the second connection portion extend in opposite directions in a direction perpendicular to the main body portion.

20. The electric power tool according to claim 19, wherein: The first circuit board includes at least one power element, and the main body is in thermal contact with a surface of the power element.

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