Circuit board, motor and vehicle

Abstract

The utility model discloses a circuit board, a motor and a vehicle, relates to the technical field of circuit boards, and aims to solve the problem that gas generated by welding in the prior art cannot be dissipated quickly. The circuit board comprises a circuit board main body. The circuit board main body is provided with a first bonding pad, a first air hole and a second air hole. And the first air hole and the second air hole are respectively positioned on two opposite sides of the first bonding pad and are symmetrically arranged relative to the first bonding pad. The circuit board is used for electrically connecting different electronic components.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit boards, in particular to circuit boards, motors and vehicles. Background Art

[0002] A printed circuit board, also known as a circuit board, is an important support for electronic components in the electronics industry and can achieve electrical connections between various components in a circuit.

[0003] In the prior art, before welding components onto a circuit board, the circuit board is connected to other components to fix the position of the circuit board, thereby improving the stability of welding. As a result, a semi-closed space is formed between the circuit board and other components.

[0004] During high-temperature welding, gases will inevitably be generated around the solder pads. These gases will enter the semi-closed space. If the gases cannot flow out of the semi-closed space in a short time, they will accumulate more and more, resulting in an increase in the air pressure in the semi-closed space, squeezing the welding position and causing problems such as poor welding. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a circuit board, a motor and a vehicle, aiming to solve the problem that the gases generated by welding in the prior art cannot be quickly dissipated.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a circuit board, including a circuit board main body. The circuit board main body is provided with a first solder pad, a first ventilation hole and a second ventilation hole. The first ventilation hole and the second ventilation hole are respectively located on opposite sides of the first solder pad and are symmetrically arranged with respect to the first solder pad.

[0008] In the circuit board provided by the embodiment of the present application, when welding is performed at the first solder pad, the gases generated around the first solder pad can flow through the ventilation holes on both sides thereof. The two ventilation holes are arranged at different positions, enabling the air around the first solder pad to flow between the space on one side of the circuit board and the space on the other side of the circuit board through the first ventilation hole and the second ventilation hole, without the occurrence of gas squeezing and increased air pressure, thereby preventing the solder joints from being affected by false soldering and void soldering.

[0009] The two first ventilation holes are located on both sides of the long strip-shaped first solder pad in the length direction, enabling the first ventilation hole to more easily fall into the first avoidance hole in the direction perpendicular to the positioning plate, making it easier to form a convection channel. Thus, the dissipation speed of the gases around the first solder pad is accelerated. It also does not affect the circuit layout and strength on the circuit board.

[0010] In some embodiments, the distance between the first ventilation hole and the first pad is less than or equal to 3 mm. The distance between the second ventilation hole and the first pad is less than or equal to 3 mm.

[0011] In some embodiments, the distance between the first ventilation hole and the first pad is greater than or equal to 2.5 mm. The distance between the second ventilation hole and the first pad is greater than or equal to 2.5 mm.

[0012] In some embodiments, the diameter of the first ventilation hole is greater than or equal to 1.8 mm. The diameter of the second ventilation hole is greater than or equal to 1.8 mm.

[0013] In some embodiments, the diameter of the first ventilation hole is less than or equal to 2.0 mm. The diameter of the second ventilation hole is less than or equal to 2.0 mm.

[0014] In some embodiments, the first pad is strip-shaped, and the first ventilation hole and the second ventilation hole are respectively located on both sides of the first pad in the length direction.

[0015] In some embodiments, the circuit board body is further provided with a second pad and a third pad. Among them, the first pad is one of the U-phase pad, the V-phase pad, and the W-phase pad. The second pad is another one of the U-phase pad, the V-phase pad, and the W-phase pad. The third pad is yet another one of the U-phase pad, the V-phase pad, and the W-phase pad.

[0016] In some embodiments, the first pad, the second pad, and the third pad are located in the first region. The distance between the edge of the first region and the outer edge of the circuit board body is greater than or equal to 14 mm.

[0017] In a second aspect, the present invention further provides a motor. The motor includes a motor housing, a motor body, and any one of the above circuit boards. The motor body is located inside the motor housing. The circuit board is located inside the motor housing. At least the first pad on the circuit board is welded to the motor body.

[0018] In some embodiments, the motor housing includes a front housing and a rear cover. The front housing is provided with an opening. The motor body is located inside the front housing. The circuit board is located on the side of the motor body facing the opening and is connected to the front housing. The first pad is located on the surface of the circuit board body facing away from the motor body. The rear cover is disposed at the opening and is connected to the front cover.

[0019] In a third aspect, the present invention further provides a vehicle. The vehicle includes any one of the above motors. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of a vehicle provided by the present utility model;

[0022] Figure 2 One of the overall structural schematic diagrams of a motor provided by the present utility model;

[0023] Figure 3 Two of the overall structural schematic diagrams of a motor provided by the present utility model;

[0024] Figure 4 One of the structural schematic diagrams of a circuit board provided by the prior art;

[0025] Figure 5 Two of the structural schematic diagrams of a circuit board provided by the prior art;

[0026] Figure 6 Three of the structural schematic diagrams of a circuit board provided by the prior art;

[0027] Figure 7 Partial structural schematic diagram of a circuit board provided by the present utility model;

[0028] Figure 8 Structural schematic diagram of a circuit board provided by the present utility model.

[0029] Reference numerals: 1 - vehicle; 2 - wheel; 3 - chassis; 4 - body; 010 - ventilation hole; 020 - pin pad; 100 - motor; 10 - motor housing; 101 - opening; 102 - shaft hole; 11 - front shell; 112 - positioning member; 113 - connecting member; 1101 - avoidance hole; 111 - positioning plate; 20 - circuit board; 21 - first pad; 22 - circuit board body; 221 - first side; 222 - second side; 2201 - positioning hole; 2202 - connection hole; 23 - first ventilation hole; 24 - second pad; 25 - third pad; 26 - second ventilation hole. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is the orientation or relative positional relationship based on the orientation shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. Without special instructions, in the case of satisfying the relative positional relationship shown in the accompanying drawings, the above-described orientation description can be flexibly set during the actual application process.

[0032] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", and "communicated" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In the embodiments of the present utility model, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the presence of another identical element in the process, article or device including the element.

[0035] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0036] The utility model provides a vehicle. Figure 1 As shown, a schematic diagram of the structure of a vehicle provided by the utility model. The vehicle 1 includes a motor.

[0037] The vehicle 1 may further include wheels 2 , a chassis 3 and a body 4 .

[0038] It is understandable that the vehicle 1 may be a fuel vehicle, an electric vehicle, a hybrid vehicle, a gas vehicle, a methanol vehicle, a solar vehicle, etc. For example, the vehicle 1 may be a passenger vehicle such as a sedan, a sport utility vehicle (SUV), a multi-purpose vehicle (MPV), or a bus, a truck, a semi-trailer, etc. This application does not impose any specific restrictions on this.

[0039] Exemplarily, the present application is described using an electric car as an example.

[0040] The chassis 3 can be used to install the motor and other components of the vehicle 1 to form the overall shape of the vehicle 1, and receive the power of the motor to make the vehicle 1 move to ensure normal driving.

[0041] The vehicle body 4 can be mounted on the chassis 3, and a cabin is formed inside the vehicle body 4, and the cabin can be used for the driver, passengers or cargo. It should be noted that when the vehicle 1 is a bus or a car, its vehicle body 4 is generally an integral structure. When the vehicle 1 is a truck, its vehicle body 4 is generally composed of a cab and a cargo box.

[0042] The wheels 2 can be mounted on the chassis 3 of the vehicle 1, and are components that support and rotate the vehicle 1 during travel. The wheels 2 are usually mounted at the four corners of the vehicle 1, i.e., the four wheels 2 of the vehicle 1, which are connected to the axle of the vehicle 1 through the wheel hubs, and then connected to the motor 100. The wheels 2 enable the vehicle 1 to travel smoothly on the ground.

[0043] Printed Circuit Board (PCB) is an important support for electronic components in the electronics industry. It can realize the electrical connection between the components in the circuit, greatly reducing the wiring workload and wiring assembly errors, and improving production labor efficiency and automation level.

[0044] With the continuous development of social economy and science and technology, PCB boards are widely used in various electrical and electronic devices, such as the PCB boards in motor devices.

[0045] The present utility model also provides a motor. As Figure 2 shown, Figure 2 FIG. 1 is one of the overall structural schematic diagrams of a motor provided by the present utility model. The motor 100 may include a motor housing 10, a motor body, and any one of the above circuit boards 20. The motor body is located inside the motor housing 10. The circuit board 20 is located inside the motor housing 10. At least the first pad 21 on the circuit board 20 is welded to the motor body.

[0046] The circuit board 20 is welded to the motor body through the first pad 21, so that the circuit of the motor body is connected to the circuit board 20. At this time, the first pad 21 on the circuit board 20 can be connected to other components and chips, so as to achieve the control of the input, output and operation of the motor body.

[0047] The motor 100 is mainly applicable to 400W electronic fans, and is also applicable to other devices.

[0048] In some embodiments, the motor housing 10 includes a front housing 11 and a rear cover. The front housing 11 is provided with an opening 101. The motor body is located inside the front housing 11. The circuit board 20 is located on the side of the motor body facing the opening 101 and is connected to the front housing 11.

[0049] The circuit board 20 may include a circuit board body 22. At least the first pad 21 is provided on the circuit board body 22. The first pad 21 is located on the surface of the circuit board body 22 facing away from the motor body. The rear cover is disposed at the opening 101 and is connected to the front cover.

[0050] Among them, as Figure 3 shown, Figure 3 FIG. 2 is another overall structural schematic diagram of a motor provided by the present utility model. A positioning plate 111 is provided on the front housing 11. A first avoidance hole 1101 is provided on the positioning plate 111. When the motor body and the circuit board 20 are welded, an insertion welding method is selected. The circuit of the motor body is welded to the first pad 21 of the circuit board 20 through the first avoidance hole 1101. The positioning plate 111 can fix the position of the circuit board 20, so that the circuit on it can operate smoothly.

[0051] Exemplarily, the diameter of the first avoidance hole 1101 may be 7.5 mm.

[0052] Specifically, the pins of the motor body circuit pass through the first solder pads 21 from the side of the circuit board main body 22 close to the motor body and are located on the side of the circuit board main body 22 facing away from the motor body. Finally, the operator solders the pins of the motor body circuit to the first solder pads 21 on the side of the circuit board 20 facing away from the motor body.

[0053] The rear cover can be connected to the front shell 11 and can seal the opening 101, so that the side of the circuit board 20 facing away from the motor body is protected by the rear cover to prevent external interference and damage to the circuit on the circuit board 20.

[0054] To ensure the welding stability between the motor body circuit and the first solder pads 21 on the circuit board main body 22, the circuit board 20 can be first connected to the front shell 11, specifically, the circuit board 20 is connected to the positioning plate 111. After connecting the circuit board 20 to the positioning plate 111, the motor body circuit is then soldered to the first solder pads 21. In this way, a semi-closed space will be formed between the circuit board 20 and the positioning plate 111.

[0055] When welding the first solder pads 21 on the circuit board main body 22, the liquid solder will increase the temperature around the first solder pads 21, thereby increasing the volume of the air around the first solder pads 21. At the same time, when welding at the first solder pads 21, gas will be generated around the first solder pads 21, and there will also be some gas generated during welding between the circuit board 20 and the positioning plate 111.

[0056] If these gases and the air that expands in volume due to thermal expansion and contraction cannot flow timely, these gases will want to flow to the outside from the first solder pads 21 under the action of pressure. Under the action of gas pressure, the first solder pads 21 are easily damaged, thereby affecting the welding firmness and the connection stability between the motor 100 main body and the first solder pads 21.

[0057] In the related art, as Figure 4 、 Figure 5 and Figure 6 shown, Figure 4 is one of the structural schematic diagrams of the circuit board provided by the prior art, Figure 5 is the second structural schematic diagram of the circuit board provided by the prior art, Figure 6 is the third structural schematic diagram of the circuit board provided by the prior art. The distance range between the ventilation holes 010 and the pin solder pads 020 is set, but the set range is unreasonable. The specific layout of the ventilation holes 010 is not considered, and the gas discharge effect is not obvious during actual welding, and problems such as uneven soldering and poor solder penetration still occur.

[0058] Based on this, as Figure 7 shown, Figure 7Partial structural schematic diagram of a circuit board provided by the present utility model. The present utility model provides a circuit board 20, which may include a circuit board main body. The circuit board main body is provided with a first pad 21, a first ventilation hole 23, and a second ventilation hole 26. The first ventilation hole 23 and the second ventilation hole 26 are respectively located on opposite sides of the first pad 21 and are symmetrically arranged with respect to the first pad 21.

[0059] For the circuit board 20 provided in the embodiment of the present application, when welding is performed at the first pad 21, the gas generated around the first pad 21 can flow between the space on one side of the circuit board and the space on the other side of the circuit board through the first ventilation hole 23 and the second ventilation hole 26, and there will be no gas extrusion to increase the air pressure, so as to avoid the situation of false soldering and void soldering of the solder joints.

[0060] The two first ventilation holes 23 are located on both sides in the length direction of the strip-shaped first pad 21, which can make the first ventilation hole 23 more likely to fall into the first avoidance hole in the direction perpendicular to the positioning plate, making it easier to form a convection channel. Thus, the dissipation speed of the gas around the first pad 21 is accelerated. And it will not affect the circuit layout and strength on the circuit board.

[0061] In some embodiments, the distance between the first ventilation hole 23 and the first pad 21 is greater than or equal to 2.5 mm. The distance between the second ventilation hole 26 and the first pad 21 is greater than or equal to 2.5 mm.

[0062] In order to enable the gas around the first pad 21 to flow timely, the distance between the first ventilation hole 23 and the first pad 21 should not be too large, specifically, it can be less than or equal to 3 mm. The distance between the second ventilation hole 26 and the first pad 21 should not be too large, specifically, it can be less than or equal to 3 mm.

[0063] Among them, the circuit board 20 can be applicable to different models of motors 100.

[0064] In some other embodiments, the number of the first ventilation holes 23 and the second ventilation holes 26 on both sides of one first pad 21 can be multiple. The number of the first ventilation holes 23 and the second ventilation holes 26 is not specifically limited, as long as the gas around the first pad 21 will not have a high air pressure situation.

[0065] In some embodiments, as Figure 7 shown, along the direction perpendicular to the positioning plate 111, at least a part of the projection of the first pad 21 on the positioning plate 111 falls within the first avoidance hole 1101. In this way, when the connecting wire of the motor body is connected to the first pad 21, the connecting wire can have a better layout position.

[0066] Exemplarily, along a direction perpendicular to the positioning plate 111, the projections of the first pad 21, the first ventilation hole 23, and the second ventilation hole 26 on the positioning plate 111 all fall within the first avoidance hole 1101.

[0067] Since the connection wires of the motor body cannot completely occupy the space within the first avoidance hole 1101, there will be some gaps left within the first avoidance hole 1101. When the projections of the first ventilation hole 23 and the second ventilation hole 26 on the positioning plate 111 fall within the first avoidance hole 1101, the first ventilation hole 23 and the second ventilation hole 26 can correspond to the gaps within the first avoidance hole 1101, forming a gas convection channel. Thus, the gas around the first pad 21 can circulate more rapidly through the convection channel.

[0068] In some embodiments, as Figure 7 shown, the distance between the first ventilation hole 23 and the first pad 21 can be greater than or equal to 2.5 mm. The distance between the second ventilation hole 26 and the first pad 21 is greater than or equal to 2.5 mm.

[0069] To ensure the strength of the circuit board body 22, the distances between the first ventilation hole 23 and the second ventilation hole 26 and the first pad 21 should not be too small. When the distances between the first ventilation hole 23 and the second ventilation hole 26 and the first pad 21 are too small, and the circuit on the circuit board body 22 is operating daily, the temperature during operation is more likely to damage the circuit board body 22, causing problems such as false soldering and void soldering of the first pad 21, affecting the strength of the circuit board 20 and the stability of the circuit operation.

[0070] Moreover, when the high-temperature liquid solder approaches the first pad 21 but does not contact it, the temperature of the high-temperature liquid solder will be conducted to the first ventilation hole 23 and the second ventilation hole 26 through the air, and then the first ventilation hole 23 and the second ventilation hole 26 will conduct the temperature to the first pad 21, preheating the first pad 21 in advance. Therefore, when the high-temperature liquid solder contacts the first pad 21, the temperature difference between the first pad 21 and the liquid solder will not be too large. At this time, the solder is more likely to enter the other side of the first pad 21 from the solder hole, improving the welding quality.

[0071] Exemplarily, the distances between the first ventilation hole 23 and the second ventilation hole 26 and the first pad 21 can specifically be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, or 3 mm.

[0072] In some embodiments, the diameter of the first ventilation hole 23 can be greater than or equal to 1.8 mm. The diameter of the second ventilation hole 26 is greater than or equal to 1.8 mm.

[0073] In order to enable the gas generated around the first pad 21 to flow smoothly through the first ventilation hole 23, the diameter of the first ventilation hole 23 should not be too small. When the diameter of the first ventilation hole 23 is small, the flow rate of the gas around the first pad 21 through the first ventilation hole 23 is limited.

[0074] When the first pad 21 is processed and welded for a long time, the amount of gas and the air pressure of the gas around the first pad 21 will increase within a short period of time. The first ventilation hole 23 with a small diameter cannot allow the gas on the circumferential side of the first pad 21 to flow in time. When the amount of gas that cannot flow in time accumulates to a large extent, the first pad 21 will still be damaged.

[0075] Moreover, the gas generated during welding contains a lot of impurities. If these impurity-containing gases cannot pass quickly through the first ventilation hole 23, the impurities in them will remain in the first ventilation hole 23, affecting the cleanliness of the ventilation hole. With the passage of time, the impurities retained in the first ventilation hole 23 will accumulate more and more, making the space that the first ventilation hole 23 can pass through smaller and further affecting the efficiency of gas dissipation.

[0076] Therefore, in order to ensure the firmness of the welding at the first pad 21, the diameter of the first ventilation hole 23 can be greater than or equal to 1.8 mm.

[0077] In some embodiments, the diameter of the first ventilation hole 23 can be less than or equal to 2.0 mm. The diameter of the second ventilation hole 26 is less than or equal to 2.0 mm.

[0078] Although the larger the diameter of the first ventilation hole 23, the greater the flow rate of the gas around the first pad 21, the diameter of the first ventilation hole 23 cannot be too large. When the diameter of the first ventilation hole 23 is too large, the overall strength of the circuit board body 22 will be reduced. At the same time, if the diameter of the first ventilation hole 23 is too large, the area occupied by the first ventilation hole 23 on the circuit board 20 will be relatively large, affecting the layout and installation of other components and circuits on the circuit board body 22.

[0079] Therefore, in order to ensure the strength of the circuit board body 22 and the layout of the circuit thereon, the diameter of the first ventilation hole 23 can be less than or equal to 2.0 mm.

[0080] Exemplarily, the diameter of the first ventilation hole 23 can specifically be 1.8 mm, 1.9 mm, 1.95 mm or 2.0 mm, etc.

[0081] In some other embodiments, as Figure 7 shown, the number of the first ventilation holes 23 and the second ventilation holes 26 can be multiple, and the multiple first ventilation holes 23 and the second ventilation holes 26 are evenly distributed on the circumferential side of the first pad 21.

[0082] A plurality of first ventilation holes 23 are evenly distributed on the periphery of the first pad 21, which can enable the gas around the first pad 21 to escape from the plurality of ventilation holes, so that the gas can circulate quickly, greatly improving the gas circulation rate.

[0083] In some embodiments, such as Figure 7 shown, the first pad 21 can be strip-shaped, and the first ventilation holes 23 and the second ventilation holes 26 are respectively located on both sides in the length direction of the first pad 21.

[0084] The first ventilation holes 23 and the second ventilation holes 26 are located on both sides in the length direction of the strip-shaped first pad 21, which can enable the first ventilation holes 23 and the second ventilation holes 26 to more easily fall into the first avoidance holes 1101 in the direction perpendicular to the positioning plate 111, making it easier to form a convection channel. Thus, the dissipation speed of the gas around the first pad 21 is accelerated.

[0085] Exemplarily, such as Figure 7 shown, the two first ventilation holes 23 can be symmetrical with respect to the length direction of the first pad 21. The two symmetrically arranged first ventilation holes 23 can make the gas flow efficiency the same on both sides.

[0086] Exemplarily, the distance L1 between the edges of the first ventilation holes 23 and the second ventilation holes 26 symmetrically arranged on both sides in the length direction of the first pad 21 is 7.2 mm.

[0087] In other embodiments, the first ventilation holes 23 and the second ventilation holes 26 can also be arranged asymmetrically with respect to the length direction of the first pad 21.

[0088] In other embodiments, the first ventilation holes 23 and the second ventilation holes 26 can also be located on one side in the length direction of the first pad 21.

[0089] In other embodiments, the first ventilation holes 23 and the second ventilation holes 26 can also be located at both ends in the length direction of the first pad 21.

[0090] In some embodiments, such as Figure 8 shown, Figure 8 is a schematic structural diagram of a circuit board provided by the present utility model. A second pad 24 and a third pad 25 can also be provided on the circuit board main body 22. Among them, the first pad 21 is one of the U-phase pad, the V-phase pad, and the W-phase pad. The second pad 24 is another one of the U-phase pad, the V-phase pad, and the W-phase pad. The third pad 25 is yet another one of the U-phase pad, the V-phase pad, and the W-phase pad.

[0091] When the motor 100 is a three-phase motor, the three independent windings of the motor 100 are the U-phase, V-phase, and W-phase. Therefore, the motor 100 will have three three-phase connection lines that are welded to the first pad 21, the second pad 24, and the third pad 25 respectively.

[0092] Among them, on both sides along the length direction of the second pad 24, the first ventilation holes 23 and the second ventilation holes 26 can be provided. On both sides along the length direction of the third pad 25, the first ventilation holes 23 and the second ventilation holes 26 can be provided.

[0093] Exemplarily, the first pad 21 can be a U-phase pad, the second pad 24 can be a V-phase pad, and the third pad 25 can be a W-phase pad.

[0094] In some other embodiments, the first pad 21 can be a V-phase pad, the second pad 24 can be a W-phase pad, and the third pad 25 can be a U-phase pad.

[0095] Specifically, the order of connection of the first pad 21, the second pad 24, and the third pad 25 to the three phases of the motor 100 is not specifically limited, as long as the three-phase connection lines of the motor 100 can be welded to the three pads respectively.

[0096] The three-phase motor 100 can provide higher output power and torque, and is suitable for application scenarios that require large loads and high power. Moreover, the three-phase motor 100 has better power density and stronger torque characteristics.

[0097] In some other embodiments, the type of the motor 100 can also be a single-phase motor.

[0098] In some embodiments, on the plane where the circuit board is located, the length of the first pad 21 in its length direction is greater than or equal to 6.8 mm and less than or equal to 7.0 mm. Specifically, the length of the second pad 24 in its length direction can be 6.8 mm, 6.9 mm, 6.95 mm, or 7.0 mm, etc.

[0099] The length of the first pad 21 in the direction perpendicular to its length direction is greater than or equal to 2.8 mm and less than or equal to. Specifically, the length of the second pad 24 in the direction perpendicular to its length direction can be 2.8 mm, 2.9 mm, 2.95 mm, or 3.0 mm, etc.

[0100] In some embodiments, the first pad 21, the second pad 24, and the third pad 25 can be located in the first area. The distance between the edge of the first area and the outer edge of the circuit board body 22 is greater than or equal to 14 mm.

[0101] To ensure the uniformity of heat dissipation during welding of the first pad 21, the second pad 24, and the third pad 25 in the first region, the first region should not be too close to the outer edge of the circuit board body 22. If the first region is too close to the outer edge of the circuit board body 22, the heat generated during welding on the pads can be sufficiently conducted and dissipated on the circuit board body 22.

[0102] The accumulated heat will cause a relatively high local heat in the circuit board body 22, resulting in a relatively large volume expansion of the local gas, which is not conducive to maintaining the stability of the gas pressure around the pads. At the same time, the relatively high local heat in the circuit board body 22 will damage the performance of the circuit board body 22 and also affect other circuits on the circuit board body 22.

[0103] Therefore, the distance between the edge of the first region and the outer edge of the circuit board body 22 should be greater than or equal to 14 mm.

[0104] Exemplarily, the distance between the edge of the first region and the outer edge of the circuit board body 22 can be less than or equal to 41 mm.

[0105] It can be understood that the distance between the edge of the first region and the outer edge of the circuit board body 22 should not be too large. Because when the distance between the edge of the first region and the outer edge on one side of the circuit board body 22 is too large, the distance between the edge of the first region and the outer edge on the other side of the circuit board body 22 will be too small, thus affecting the heat dissipation efficiency during welding of the solder plate. Therefore, the distance between the edge of the first region and the outer edge of the circuit board body 22 can be less than or equal to 41 mm.

[0106] Therefore, it can be obtained that the distance between the edge of the first region and the outer edge of the circuit board body 22 can be greater than or equal to 14 mm and less than or equal to 41 mm.

[0107] Exemplarily, along the x-axis direction, the distance between the midpoint of the first welding pad and the outer edge of the first side 221 of the circuit board body 22 can be greater than or equal to 40 mm and less than or equal to 41 mm. Along the y-axis direction, the distance between the midpoint of the first welding pad and the outer edge of the second side 222 of the circuit board body 22 can be greater than or equal to 35 mm and less than or equal to 36 mm.

[0108] Exemplarily, along the x-axis direction, the distance between the midpoint of the second welding pad and the outer edge of the first side 221 of the circuit board body 22 can be greater than or equal to 14 mm and less than or equal to 15 mm. Along the y-axis direction, the distance between the midpoint of the second welding pad and the outer edge of the second side 222 of the circuit board body 22 can be greater than or equal to 20 mm and less than or equal to 21 mm.

[0109] Exemplarily, along the x-axis direction, the distance from the midpoint of the third welding pad to the outer edge of the first side 221 of the circuit board body 22 can be greater than or equal to 40 mm and less than or equal to 41 mm. Along the y-axis direction, the distance from the midpoint of the third welding pad to the outer edge of the second side 222 of the circuit board body 22 can be greater than or equal to 30 mm and less than or equal to 31 mm.

[0110] Thereby, the first welding pad 21, the second welding pad 24, and the third welding pad 25 are located in the middle of the circuit board 20. In this way, the heat generated during welding at the first welding pad 21, the second welding pad 24, and the third welding pad 25 can be evenly conducted from the center of the circuit board 20 to the surrounding, avoiding local heat accumulation during welding.

[0111] In some embodiments, the angles between the three length directions of the first welding pad 21, the second welding pad 24, and the third welding pad 25 are all 120°.

[0112] In this way, the three welding pads can be surrounded, their distributed positions are evenly staggered, and the heat generated during welding at the three welding pads can be conducted in different directions. This method improves the heat dissipation speed of the circuit board 20 and avoids damage to components or circuits caused by local heat accumulation.

[0113] In some embodiments, as Figure 3 and Figure 8 shown, the positioning plate 111 may further include a positioning member 112 and a connecting member 113, and the circuit board body 22 may further include a positioning hole 2201 and a connecting hole 2202.

[0114] Before welding the connecting wire of the motor body to the circuit board 20, it is necessary to first install the circuit board 20 on the positioning plate 111 to determine the position of the circuit board 20. During installation, first pass the positioning member 112 through the positioning hole 2201 to fix the position of the circuit board 20 relative to the positioning plate 111. Then connect the connecting member 113 with the connecting hole 2202. The connection between the circuit board 20 and the positioning plate 111 is completed.

[0115] Exemplarily, the connecting member 113 may be a screw. The method of using screws for connection is relatively stable and can be disassembled and repaired after the circuit board 20 fails.

[0116] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0117] In some embodiments, as Figure 3 shown, the front cover may further include a shaft hole 102 for accommodating the motor bearing.

[0118] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A circuit board (20), characterized in that: include: A circuit board body (22), wherein the circuit board body (22) is provided with: a first pad (21); and A first vent hole (23) and a second vent hole (26), wherein the first vent hole (23) and the second vent hole (26) are respectively located on two opposite sides of the first pad (21) and are symmetrically arranged with respect to the first pad (21).

2. The circuit board (20) according to claim 1, characterized in that: The distance between the first vent hole (23) and the first pad (21) is less than or equal to 3 mm; and the distance between the second vent hole (26) and the first pad (21) is less than or equal to 3 mm.

3. The circuit board (20) according to claim 1, characterized in that: The distance between the first vent hole (23) and the first pad (21) is greater than or equal to 2.5 mm; and the distance between the second vent hole (26) and the first pad (21) is greater than or equal to 2.5 mm.

4. The circuit board (20) according to claim 1, characterized in that: The diameter of the first air vent (23) is greater than or equal to 1.8 mm; the diameter of the second air vent (26) is greater than or equal to 1.8 mm.

5. The circuit board (20) according to claim 1, characterized in that: The diameter of the first air vent (23) is less than or equal to 2.0 mm; the diameter of the second air vent (26) is less than or equal to 2.0 mm.

6. The circuit board (20) according to claim 1, characterized in that: The first solder pad (21) is in the shape of an elongated strip, and the first air vent (23) and the second air vent (26) are respectively located on two sides of the first solder pad (21) in the length direction.

7. The circuit board (20) according to claim 1, characterized in that: The circuit board body (22) is also provided with a second solder pad (24) and a third solder pad (25); wherein the first solder pad (21) is one of the U-phase solder pad, the V-phase solder pad and the W-phase solder pad; the second solder pad (24) is the other of the U-phase solder pad, the V-phase solder pad and the W-phase solder pad; and the third solder pad (25) is yet another of the U-phase solder pad, the V-phase solder pad and the W-phase solder pad.

8. The circuit board (20) according to claim 7, characterized in that: The first solder pad (21), the second solder pad (24) and the third solder pad (25) are located in a first area; the distance between the edge of the first area and the outer edge of the circuit board body (22) is greater than or equal to 14 mm.

9. A motor (100), characterized in that: include: Motor housing (10); a motor body, the motor body being located in the motor housing (10); and The circuit board (20) according to any one of claims 1 to 8, wherein the circuit board (20) is located inside the motor housing (10); and at least the first solder pad (21) on the circuit board (20) is soldered to the motor body.

10. The electric machine (100) according to claim 9, characterized in that The motor housing (10) comprises: A front shell (11), the front shell (11) being provided with an opening (101); the motor body being located in the front shell (11); the circuit board (20) being located on a side of the motor body facing the opening (101) and being connected to the front shell (11); the first solder pad (21) being located on a surface of the circuit board body (22) facing away from the motor body; and, A rear cover is arranged at the opening (101) and connected to the front shell (11).

11. A vehicle (1), characterized in that The vehicle (1) comprises: The motor (100) according to any one of claims 9 to 10.

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