Circuit board assembly structure of a pump device, pump device and vehicle

Abstract

The present application provides a circuit board assembly structure of a pump device, a pump device and a vehicle. The circuit board assembly structure includes: a fixing plate provided with an avoidance notch; a circuit board located on one side of the fixing plate and connected to the fixing plate, the circuit board is provided with a first welding hole for the motor terminal of the pump device to be inserted along the direction from the circuit board to the fixing plate and welded to the circuit board, and the first welding hole is correspondingly arranged with the avoidance notch; an end cover located on the other side of the fixing plate and connected to the fixing plate; a connector including a pin and a sleeve sleeved outside the pin, and the pin passes through the end cover and is connected to the circuit board. The present application solves the problem of difficult welding of the pump device structure where the motor and the connector are located on both sides of the circuit board, and realizes the simple welding of the circuit board and the motor terminal. And compared with the prior art solution where the motor terminal is in interference fit with the circuit board by the press-fit process, the production cost and the assembly cost are effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of pump devices, and more particularly, to a circuit board assembly structure of a pump device, a pump device, and a vehicle. Background Art

[0002] Currently, the circuit boards of pump devices are mostly electrically connected to the motor terminals and the pins of connectors by welding. However, for some pump devices, the motor and the connector are arranged on both sides of the circuit board. If welding is used, it is necessary to perform welding from two opposite directions, resulting in very high welding difficulty and being difficult to implement.

[0003] To solve the circuit board connection problem of this structure, a common method is to use the presfit process for the connection between the motor terminals and the circuit board (the Press-Fit technology uses press-fit pins to achieve connection through interference fit, thus eliminating the need for solder joints). Press-fit means that the pins have an interference fit with the holes in the circuit board. The advantage is that welding is avoided, and the disadvantage is that a relatively large force is required when pressing the press-fit pins. It is necessary to add a fixing plate on one side of the circuit board to provide a supporting force for the circuit board when pressing the press-fit pins to prevent damage to the circuit board due to excessive pressing force. However, the fixing plate itself needs to be fixedly supported and positioned in terms of rotation direction, resulting in the need to make new features in the structure to solve the assembly problem of the fixing plate. Summary of the Invention

[0004] To solve at least one of the above technical problems, an object of the present application is to provide a circuit board assembly structure of a pump device.

[0005] Another object of the present application is to provide a pump device including the above circuit board assembly structure.

[0006] Still another object of the present application is to provide a vehicle including the above pump device.

[0007] To achieve the above object, according to an embodiment of the first aspect of the present application, there is provided a circuit board assembly structure of a pump device, including: a fixing plate provided with an avoidance notch; a circuit board located on one side of the fixing plate and connected to the fixing plate, the circuit board being provided with a first welding hole for inserting a motor terminal of the pump device along a direction from the circuit board to the fixing plate and being welded to the circuit board, and the first welding hole being correspondingly arranged with the avoidance notch; a end cover located on the other side of the fixing plate and connected to the fixing plate; a connector including a pin and a sleeve sleeved outside the pin, the pin passing through the end cover and connecting to the circuit board.

[0008] The circuit board assembly structure of the pump device provided by the embodiments of the present application addresses the problem of difficult soldering in the pump device structure where the motor and the connector are located on both sides of the circuit board. By utilizing the positional relationships among the circuit board, the fixing plate, the end cover, the connector, as well as the positional relationship between the first soldering hole and the avoidance notch, the easy soldering of the circuit board and the motor terminals is achieved, solving the soldering problem between the motor terminals and the circuit board in the above pump device structure. Compared with the prior art solution where the motor terminals use press-fit pins for interference fit with the circuit board, the motor terminals in this solution can use conventional terminals, thus effectively reducing the production cost. Moreover, compared with the press-fit process, the soldering process is more mature and relatively simple, which is conducive to reducing the assembly cost.

[0009] In addition, the circuit board assembly structure of the pump device in the above technical solution provided by the present application may also have the following additional technical features:

[0010] According to an embodiment of the present application, the fixing plate and the connector are of an integral structure.

[0011] When the fixing plate and the connector are of an integral structure, after assembling the fixing plate and the circuit board, the pins of the connector are also accurately positioned synchronously with the circuit board, and then they can be fixedly connected, which omits the positioning process between the connector and the circuit board, thus further improving the assembly efficiency. At the same time, the fixing plate also plays a role in fixing the connector, omitting the mechanical fixing connection process between the sleeve of the connector and other components such as the fixing plate or the end cover, and also improving the assembly efficiency. In addition, the fixing plate and the connector can be formed integrally by injection molding or the like, and the seal between the connector and other components such as the fixing plate or the end cover is also omitted, reducing the number of components of the pump device and making the structure simpler.

[0012] According to an embodiment of the present application, the fixing plate includes: a fixing plate body, the fixing plate body is provided with the avoidance notch and is connected to the end cover; and at least one fixing portion, the fixing portion protrudes from the surface of the fixing plate body facing the circuit board; wherein, the circuit board is provided with at least one first connection hole, and the fixing portion cooperates with the first connection hole to fixedly connect the circuit board and the fixing plate.

[0013] The fixing plate includes a fixing plate body and at least one fixing portion. The fixing plate body is the main part of the fixing plate, which can support the circuit board and realize the connection function with the end cover. By reasonably designing the shape of the fixing plate body, the required avoidance notch can be formed to meet the different requirements of different products. The fixing portion cooperates with the first connection hole of the circuit board to fix the fixing plate to the circuit board and ensure the stability of the circuit board. At the same time, the fixing portion protrudes from the surface of the fixing plate body facing the circuit board, which can make a certain distance between the fixing plate body and the circuit board, facilitating the avoidance of components on the circuit board, being beneficial to the reasonable layout of components on the circuit board, and also facilitating the heat dissipation of the circuit board.

[0014] According to an embodiment of the present application, the fixing portion and the first connection hole are fixedly connected by a fastener, and the fastener is a screw; or the fixing portion and the first connection hole are riveted and fixed; or the fixing portion includes at least one first buckle, and the first buckle is snap-fitted with the first connection hole.

[0015] The fixing portion and the first connection hole are fixedly connected by fasteners such as screws, with high connection strength and firm fixation.

[0016] Or, the fixing portion and the first connection hole are riveted and fixed, and the connection strength is also relatively high, with relatively firm fixation.

[0017] Or, the fixing portion includes at least one first buckle. The first buckle passes through the first connection hole and is snap-fitted with the circuit board. Compared with the screw connection method, the assembly method is simpler and faster, which is beneficial to simplifying the assembly process and further improving the assembly efficiency.

[0018] According to an embodiment of the present application, the fixing plate further includes: a sealing boss, which is arranged on the surface of the fixing plate body facing the circuit board and is arranged along the circumference of the avoidance notch, and the shape of the sealing boss is adapted to the inner wall surface of the housing of the pump device. A first sealing groove for installing a first sealing ring is provided on the outer side wall of the sealing boss.

[0019] The fixing plate further includes a sealing boss. Since the sealing boss is arranged along the circumference of the fixing plate body, it forms an annular structure. Since the shape of the sealing boss is adapted to the inner wall surface of the housing, it can be embedded into the housing. In this way, a first sealing groove is provided on the outer side wall of the sealing boss. After installing the first sealing ring, a part of the first sealing ring is embedded into the first sealing groove and abuts against the inner wall surface of the housing, that is: the first sealing ring is clamped between the inner wall surface of the housing and the sealing boss, so as to realize the radial sealing between the fixing plate and the housing. This is beneficial to reducing the wall thickness of the housing and preventing the problem of difficult sealing caused by the too thin wall thickness of the housing that makes it difficult to open the sealing groove, meeting the sealing requirements of products with high requirements for the wall thickness of the housing.

[0020] According to an embodiment of the present application, the circuit board is provided with a second welding hole, and the pin is fixedly welded to the second welding hole; alternatively, the pin is a press-fit terminal, the circuit board is provided with a plugging hole, and the press-fit terminal is in interference fit with the plugging hole; or the circuit board assembly structure of the pump device further includes an electrical plug-in component, which is arranged on the circuit board and electrically connected to the circuit board. The electrical plug-in component includes a jack and an elastic conductive part, and the pin passes through the end cover and is in plug-in fit with the jack and contacts the elastic conductive part.

[0021] The circuit board and the pin are fixedly connected by welding. The welding process is simple and the cost is low.

[0022] Alternatively, the connection between the circuit board and the pin of the connector can also be realized by using the pressfit process (or called the crimping process), that is: the pin adopts a press-fit terminal (i.e., a press-fit pin), and the circuit board is provided with a plugging hole adapted to the pin. Through the press-fitting method, the pin is in interference fit with the plugging hole to realize the electrical connection between the pin and the circuit board. In this case, the fixing plate can provide a supporting force for the circuit board, so as to ensure that the circuit board will not be damaged when the pin is inserted into the circuit board. Compared with the scheme in which both the circuit board and the motor terminal and the pin of the connector are fixedly welded, this scheme can save a welding process and a welding machine, which is also beneficial to cost saving.

[0023] Alternatively, the pluggable connection between the pin of the connector and the circuit board is realized by using an electrical plug-in component, which realizes welding-free fixing and the operation method is relatively simple. At the same time, since the elastic conductive part of the electrical plug-in component can undergo elastic deformation, the resistance received when the pin is inserted into the jack can be significantly reduced, and then the operation force when the pin is inserted into the circuit board can be significantly reduced, greatly reducing the assembly difficulty between the pin and the circuit board; and the reset elastic force of the elastic conductive part can be used to ensure good contact between the elastic conductive part and the pin, thereby improving the cooperation reliability between the pin and the electrical plug-in component. Compared with the pressfit process, the plugging and unplugging method of the pin and the electrical plug-in component in this scheme is simpler, the requirements for the pressing force and the positioning accuracy are significantly reduced, the assembly is convenient and fast, which is beneficial to reducing the assembly cost; and ordinary pins can be used for the pins, which is beneficial to reducing the production cost.

[0024] According to an embodiment of the present application, the end cover is provided with an assembly hole, and the assembly hole is in clearance fit with the sleeve.

[0025] The assembly hole of the end cover is in clearance fit with the sleeve of the connector. Since the assembly hole has a certain depth, it is equivalent to adding a structure for supporting and strengthening the sleeve on the outer periphery of the sleeve, which can effectively prevent the probability of the connector tilting, deforming, etc. during the plugging and unplugging process with the female end, thereby improving the plugging and unplugging force of the connector, improving the use reliability of the connector, and being beneficial to extending the service life of the connector.

[0026] According to an embodiment of the present application, the assembly hole and the avoidance notch are arranged in a staggered manner.

[0027] The assembly hole and the avoidance notch are arranged in a staggered manner, so that the connector is also arranged in a staggered manner with the avoidance notch, which is beneficial to avoiding interference between the connector and the components corresponding to the avoidance notch on the circuit board, and is beneficial to optimizing the layout of the circuit board.

[0028] According to an embodiment of the present application, the circuit board assembly structure of the pump device further includes: a reinforcing boss, which is arranged on the surface of the end cover facing away from the fixed plate, is arranged along the circumference of the assembly hole, and the reinforcing boss is in clearance fit with the sleeve.

[0029] The setting of the reinforcing boss is equivalent to deepening the depth of the assembly hole in disguise, so that the end cover can play a more reliable supporting and strengthening role on the sleeve of the connector, thereby further improving the insertion and extraction force of the connector, further improving the use reliability of the connector, and further extending the service life of the connector.

[0030] According to an embodiment of the present application, the fixed plate is a plastic part.

[0031] The fixed plate is made of a plastic part, which is convenient for processing various required shapes by injection molding to meet the requirements of product structure and performance; and it is convenient for integrally injection molding with the connector to realize an integral structure.

[0032] According to an embodiment of the present application, the circuit board includes: a circuit board body, a heat dissipation area is arranged on the surface of the circuit board body facing the fixed plate, and the heat dissipation area is arranged corresponding to the avoidance notch; first surface components, the first surface components include at least one heat dissipation element, and the at least one heat dissipation element is arranged in the heat dissipation area.

[0033] The circuit board includes a circuit board body and first surface components. The first surface components include at least one heat dissipation element. The setting of the heat dissipation element is convenient for dissipating the heat generated by the circuit board in time, preventing the circuit board from malfunctioning due to excessive temperature rise during use, thereby improving the use reliability of the circuit board, and further improving the use reliability of the pump device. A heat dissipation area is arranged on the surface of the circuit board body facing the fixed plate, and all the heat dissipation elements of the first surface components are concentrated in the heat dissipation area, so that the heat dissipation elements can be concentrated and exposed in the avoidance notch, which is beneficial to improving the heat dissipation effect of the circuit board, and is also convenient for the heat dissipation elements to contact the end cover with better thermal conductivity, and then efficiently dissipate heat through the end cover to further improve the heat dissipation effect. At the same time, it is also beneficial to simplify the shape of the avoidance notch, make the shape of the avoidance notch more regular, thereby reducing the processing difficulty of the fixed plate and reducing the production cost.

[0034] According to an embodiment of the present application, the circuit board assembly structure of the pump device further includes: a heat conduction structure, which is provided between the heat dissipation element and the end cover, is in contact with the heat dissipation element and the end cover, and the end cover is a metal part.

[0035] A heat conduction structure is added between the heat dissipation element and the end cover, and the end cover is made of a metal part. Since the metal and the heat conduction structure have good heat conduction performance, the heat of the heat dissipation element can be quickly transferred to the end cover through the heat conduction structure and then dissipated outward, which greatly improves the heat dissipation performance of the product and significantly improves the heat dissipation effect.

[0036] At the same time, since all the heat dissipation elements of the components on the first board surface are concentrated in the heat dissipation area, it is convenient for the one-time arrangement of the heat conduction structure.

[0037] According to an embodiment of the present application, the heat conduction structure includes at least one of heat-conducting glue and heat-conducting pads.

[0038] The heat-conducting glue is set by smearing, with a simple process and low cost. Specifically, it can be smeared on at least one of the heat dissipation element and the end cover, and is relatively convenient to use. The heat-conducting pad can also be fixed by pasting or directly clamped between the heat dissipation element and the end cover, and also has the advantages of simple structure, convenient assembly and low cost.

[0039] According to an embodiment of the present application, the end cover includes: an end cover body; and a heat dissipation boss, which is provided on the board surface of the end cover body facing the fixing board and is correspondingly arranged with the heat dissipation element; wherein, the heat conduction structure is provided between the heat dissipation element and the heat dissipation boss and is in contact with the heat dissipation element and the heat dissipation boss.

[0040] The end cover includes an end cover body and a heat dissipation boss. The end cover body is connected to the fixing board, and the pins of the contact part pass through the end cover body and are electrically connected to the circuit board, realizing the cooperation between the end cover, the fixing board and the connector. The setting of the heat dissipation boss is beneficial to further increase the heat dissipation area of the end cover, thereby further improving the heat dissipation effect. At the same time, it is also beneficial to reduce the thickness of the heat conduction structure, simplify the heat conduction structure, and thus reduce the cost of the heat conduction structure.

[0041] According to an embodiment of the present application, the circuit board assembly structure of the pump device further includes: heat dissipation fins, which are provided on the board surface of the end cover facing away from the fixing board.

[0042] Setting heat dissipation fins on the board surface of the end cover facing away from the fixing board can further increase the heat dissipation area of the product, thereby further improving the heat dissipation performance of the product.

[0043] According to an embodiment of the present application, the circuit board further includes: second-side surface components, which are arranged on the surface of the circuit board body facing away from the fixing plate, and the second-side surface components include a capacitor element and an inductor element.

[0044] Some capacitor elements and inductor elements are relatively large in volume and high in height. By uniformly arranging these elements on the surface of the circuit board body facing away from the fixing plate, they are located on the same side of the circuit board, which is convenient for reasonably utilizing the axial space between the circuit board and the motor; and compared with being separated on both sides of the circuit board body, this solution is beneficial to reducing the axial size of the circuit board, and thus beneficial to reducing the axial size of the motor.

[0045] According to an embodiment of the present application, the first-side surface components include a grounding element, and the grounding element is in contact with the end cover, and the end cover is a metal part.

[0046] When the end cover is made of a metal part, since metal has a conductive function, when the grounding element of the circuit board is in physical contact with the end cover made of metal, electrical connection can be achieved, thereby realizing the grounding design of the circuit board, improving the anti-electromagnetic interference ability of the circuit board, and thus improving the electromagnetic compatibility of the product, that is, improving the EMC performance of the product.

[0047] According to an embodiment of the present application, the end cover includes: an end cover body; and a positioning boss, the positioning boss is arranged on the surface of the end cover body facing the fixing plate and is adapted to the shape of the avoiding notch, and the positioning boss is embedded in the avoiding notch.

[0048] The end cover includes an end cover body and a positioning boss. Since the positioning boss is adapted to the shape of the avoiding notch, during assembly, the positioning boss can be directly embedded in the avoiding notch to realize the relative fixation of the end cover and the fixing plate, playing a good role in assembly positioning, and thus further improving the assembly efficiency.

[0049] According to an embodiment of the present application, the circuit board assembly structure of the pump device further includes: a second sealing ring, and the second sealing ring is arranged between the end cover and the fixing plate.

[0050] Setting a second sealing ring between the end cover and the fixing plate can ensure the sealing reliability between the end cover and the fixing plate, prevent liquid from entering the pump device through the gap between the end cover and the fixing plate, and thus improve the use reliability of the pump device.

[0051] According to an embodiment of the present application, a second sealing groove is provided on the outer sidewall of the positioning boss of the end cover, and the second sealing groove is arranged along the circumferential direction of the avoidance notch. The second sealing ring is embedded in the second sealing groove and abuts against the fixing plate; alternatively, a second sealing groove is provided on one of the plate surface of the fixing plate facing the end cover and the plate surface of the end cover facing the fixing plate, and the second sealing groove is arranged along the circumferential direction of the avoidance notch. The second sealing ring is embedded in the second sealing groove and abuts against the fixing plate and the end cover.

[0052] By providing a second sealing groove on the outer sidewall of the positioning boss of the end cover and installing a second sealing ring at the second sealing groove, after assembly, the second sealing ring is clamped between the outer sidewall of the positioning boss and the fixing plate, playing a role of radial sealing for the fixing plate and the end cover. This solution is beneficial to reducing the thickness of the fixing plate and the end cover body, and thus beneficial to reducing the axial dimension of the pump device.

[0053] Alternatively, when the thickness of the fixing plate and / or the thickness of the end cover is sufficient, a second sealing groove can be correspondingly provided on the plate surface of the fixing plate facing the end cover and / or the plate surface of the end cover facing the fixing plate. After assembly, the second sealing ring can achieve axial sealing between the fixing plate and the end cover, and can also ensure the sealing reliability between the end cover and the fixing plate.

[0054] According to an embodiment of the present application, the fixing plate is provided with a second connection hole, and the end cover is provided with a third connection hole. The second connection hole and the third connection hole are for a fastener to pass through, so that the fixing plate and the end cover are fixedly connected by the fastener.

[0055] By providing a second connection hole on the fixing plate and correspondingly providing a third connection hole on the end cover, during assembly, the fixing plate and the end cover can be fixedly connected by using fasteners such as screws. The structure is simple and the fixation is reliable.

[0056] According to an embodiment of the present application, the end cover is a plastic part.

[0057] For products with low heat dissipation requirements, using a plastic part for the end cover can reduce the weight of the product and the cost of the product compared with a metal part.

[0058] According to an embodiment of the second aspect of the present application, a pump device is provided, including: a pump part, the pump part is provided with an input port and an output port; a motor part, the motor part is connected to the pump part, the motor part includes motor terminals; and a circuit board assembly structure of the pump device according to any one of the embodiments of the first aspect, the circuit board assembly structure is connected to the motor part, and the motor terminals are fixedly welded to the first welding holes of the circuit board assembly structure.

[0059] The pump device provided by the embodiment of the second aspect of the present application includes the circuit board assembly structure of the pump device in any one of the embodiments of the first aspect, and thus has all the beneficial effects of any one of the above embodiments, which will not be elaborated herein.

[0060] According to an embodiment of the present application, the motor part includes a housing, and the fixing plate and the end cover of the circuit board assembly structure are fixedly connected to the housing through fasteners.

[0061] The fixing connection of the fixing plate, the end cover and the housing is realized through fasteners such as screws, which is firmly fixed, simple in assembly, and conducive to simplifying the assembly process.

[0062] According to an embodiment of the present application, the housing is a metal part.

[0063] The housing is made of a metal part. Since the metal has good thermal conductivity, it is conducive to the heat dissipation of the product. Further, for the solution where the end cover is a metal part, the end cover contacts the grounding element of the circuit board and the end cover is fixedly connected to the housing through screws, the end cover can be conductive through the screws and the metal housing, so that the housing is also indirectly electrically connected to the grounding element of the circuit board, realizing the grounding design, thereby further improving the electromagnetic compatibility of the product, that is, further improving the EMC performance of the product.

[0064] According to an embodiment of the third aspect of the present application, a vehicle is provided, including: a vehicle body; and the pump device in any one of the embodiments of the second aspect, and the pump device is installed on the vehicle body.

[0065] The vehicle provided by the embodiment of the third aspect of the present application includes the pump device in any one of the embodiments of the second aspect, and thus has all the beneficial effects of any one of the above embodiments, which will not be elaborated herein.

[0066] The additional aspects and advantages of the present application will become obvious in the following description part, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0068] Figure 1 is an exploded view of the circuit board assembly structure of the pump device provided by an embodiment of the present application;

[0069] Figure 2 is an exploded view of the circuit board assembly structure of the pump device provided by an embodiment of the present application;

[0070] Figure 3 is an exploded view of the circuit board assembly structure of the pump device provided by an embodiment of the present application;

[0071] Figure 4 It is a partial structural schematic diagram of the circuit board assembly structure of the pump device provided by an embodiment of the present application;

[0072] Figure 5 It is a three-dimensional structural schematic diagram of the pump device provided by an embodiment of the present application after removing the end cover;

[0073] Figure 6 It is a three-dimensional structural schematic diagram of the pump device from the first perspective provided by an embodiment of the present application;

[0074] Figure 7 It is a sectional structural schematic diagram of the pump device provided by an embodiment of the present application;

[0075] Figure 8 It is a sectional structural schematic diagram of the pump device provided by an embodiment of the present application;

[0076] Figure 9 It is Figure 6 The three-dimensional structural schematic diagram of the pump device from the second perspective shown;

[0077] Figure 10 It is Figure 6 The three-dimensional structural schematic diagram of the pump device from the third perspective shown;

[0078] Figure 11 It is a schematic block diagram of a vehicle provided by an embodiment of the present application;

[0079] Figure 12 It is a partial sectional structural schematic diagram of the pump device provided by an embodiment of the present application;

[0080] Figure 13 It is Figure 12 The structural schematic diagram of the pump cover (including the orthographic projection of the internal gear on the pump cover) of the pump device shown;

[0081] Figure 14 It is a partial sectional structural schematic diagram of the pump device provided by an embodiment of the present application;

[0082] Figure 15 It is Figure 14 The partial structural schematic diagram of the pump cover of the pump device shown;

[0083] Figure 16 It is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0084] Figure 17 It is a three-dimensional structural schematic diagram of an electrical plug-in provided by an embodiment of the present application;

[0085] Figure 18 It is Figure 17 The structural schematic diagram of the electrical plug-in from the first perspective shown;

[0086] Figure 19 is Figure 17 a schematic structural view of the second perspective of the electrical connector shown;

[0087] Figure 20 is Figure 17 a schematic structural view of the third perspective of the electrical connector shown;

[0088] Figure 21 is a schematic structural view of a circuit board provided by an embodiment of the present application.

[0089] Among them, Figures 1 to 21 the corresponding relationship between the reference numerals and the component names in is:

[0090] 1 fixing plate, 11 fixing plate body, 111 avoidance notch, 112 second connection hole, 12 fixing part, 122 buckle, 13 sealing boss, 131 first sealing groove;

[0091] 2 circuit board, 21 circuit board body, 211 heat dissipation area, 22 first board surface components, 221 heat dissipation element, 222 grounding element, 23 second board surface components, 231 capacitor element, 232 inductor element, 24 first welding hole, 25 second welding hole, 26 first connection hole, 27 heat dissipation fins;

[0092] 3 end cover, 31 end cover body, 311 assembly hole, 312 third connection hole, 32 heat dissipation boss, 33 positioning boss, 331 second sealing groove, 34 strengthening boss, 35 grounding boss;

[0093] 4 connector, 41 sleeve, 42 pin;

[0094] 5 heat conduction structure, 51 first sealing ring, 52 second sealing ring, 53 fastener;

[0095] 6 pump part, 61 input port, 62 output port, 63 internal gear, 64 external gear, 65 pump cover, 651 second lubricating groove, 652 thrust lubricating groove, 653 throttle hole, 654 second flow channel, 655 second throttle groove, 656 oil sump, 657 second bearing part, 66 first pressure chamber, 67 second pressure chamber;

[0096] 7 motor part, 71 motor terminal, 72 housing, 721 first throttle groove, 722 first lubricating groove, 723 first flow channel, 724 pressure relief hole, 725 first bearing part, 73 rotor assembly, 74 stator assembly, 75 rotating shaft, 76 oil seal;

[0097] 8 electrical connector, 81 elastic conductive part, 811 elastic piece, 82 connection seat, 821 bracket, 8211 jack, 822 pad, 823 avoidance space;

[0098] 100 Circuit board assembly structure, 200 Pump device, 300 Vehicle, 302 Vehicle body, 304 Driving component, 306 Oil storage part. Detailed implementation manners

[0099] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0100] Many specific details are set forth in the following description in order to fully understand the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0101] Next, refer to Figures 1 to 21 Describe the circuit board assembly structure, pump device and vehicle of the pump device provided by some embodiments of the present application.

[0102] As Figure 1 shown, the circuit board assembly structure 100 of the pump device 200 provided by an embodiment of the first aspect of the present application includes: a fixing plate 1, a circuit board 2, an end cover 3 and a connector 4.

[0103] Specifically, the fixing plate 1 is provided with an avoidance notch 111.

[0104] The circuit board 2 is located on one side of the fixing plate 1 and is connected to the fixing plate 1. The circuit board 2 is provided with a first welding hole 24. The first welding hole 24 is used for the motor terminal 71 of the pump device 200 to be inserted along the direction from the circuit board 2 to the fixing plate 1 and welded to the circuit board 2, and the first welding hole 24 is correspondingly arranged with the avoidance notch 111.

[0105] The end cover 3 is located on the other side of the fixing plate 1 and is connected to the fixing plate 1.

[0106] The connector 4 includes a pin 42 and a sleeve 41 sleeved outside the pin 42. The pin 42 passes through the end cover 3 and is connected to the circuit board 2.

[0107] For the circuit board assembly structure 100 of the pump device 200 provided by the embodiment of the present application, aiming at the problem of difficult welding of the pump device 200 structure where the motor and the connector 4 are separated on both sides of the circuit board 2, by using the positional relationship among the circuit board 2, the fixing plate 1, the end cover 3, the connector 4 and the positional relationship between the first welding hole 24 and the avoidance notch 111, the simple welding of the circuit board 2 and the motor terminal 71 is realized, and the welding problem between the motor terminal 71 and the circuit board 2 in the above-mentioned pump device 200 structure is solved.

[0108] Compared with the prior art solution where the motor terminal 71 uses a press-fit pin for interference fit with the circuit board 2, the motor terminal 71 in this solution can use a conventional terminal, thus effectively reducing the production cost; and compared with the press-fit process, the welding process is more mature and the process is relatively simple, which is conducive to reducing the assembly cost.

[0109] Specifically, the circuit board assembly structure 100 includes a fixing plate 1, a circuit board 2, an end cover 3, and a connector 4. The circuit board 2, the fixing plate 1, the end cover 3, and the connector 4 are arranged in sequence along the thickness direction of the circuit board 2 as a whole. Then, the circuit board 2 and the end cover 3 are located on both sides of the fixing plate 1, and the motor of the pump device 200 and the connector 4 are also located on both sides of the circuit board 2. The motor terminal 71 and the pin 42 of the connector 4 need to be connected to the circuit board 2 from two opposite directions (both achieving mechanical connection and electrical connection at the same time). The fixing plate 1 is connected to the circuit board 2, which can fix the circuit board 2 and provide a supporting force for the circuit board 2, reducing the risk of deformation and displacement of the circuit board 2 during the assembly process, and improving the assembly efficiency of the circuit board 2 with the motor terminal 71 and the connector 4.

[0110] At the same time, the fixing plate 1 is provided with an avoidance notch 111. Since the avoidance notch 111 is correspondingly arranged with the first welding hole 24, after the circuit board 2 is fixed on the fixing plate 1, when the motor terminal 71 is inserted into the first welding hole 24 along the direction from the circuit board 2 to the fixing plate 1, it will not be blocked by the fixing plate 1 but be exposed in the avoidance notch 111. In this way, the avoidance notch 111 can provide an operating space for the welding of the motor terminal 71 and the circuit board 2, facilitating the welding and fixing between the motor terminal 71 and the circuit board 2.

[0111] The connection between the connector 4 and the circuit board 2 can be carried out separately before connecting the motor terminal 71. Since it is not affected by the motor structure, the specific connection method between the connector 4 and the circuit board 2 is not limited. It can use the existing press-fit process or other processes.

[0112] The fixing of the sleeve 41 of the connector 4 can be achieved by fixedly connecting with the fixing plate 1 or fixedly connecting with the end cover 3. After the motor terminal 71 and the pin 42 of the connector 4 are connected to the circuit board 2, then install the end cover 3, ensuring that the end cover 3 is connected to the fixing plate 1 and connected to the housing 72 of the pump device 200.

[0113] The specific assembly process is as follows: During assembly, first fix the circuit board 2 to the fixing plate 1; then connect the pins 42 of the connector 4 to the circuit board 2; next, align the first soldering holes 24 of the circuit board 2 with the motor terminals 71, and insert the motor terminals 71 into the first soldering holes 24 along the direction from the circuit board 2 to the fixing plate 1. At this time, the motor terminals 71 and the first soldering holes 24 are exposed within the avoidance notch 111, and the avoidance notch 111 can provide sufficient soldering space; then use the avoidance notch 111 to solder and fix the motor terminals 71 to the circuit board 2. Since there is sufficient soldering space, the soldering difficulty is relatively low and the assembly efficiency is high; next, install the end cover 3 to cover the avoidance notch 111 of the fixing plate 1 to ensure the integrity of the appearance of the pump device 200.

[0114] In an embodiment of the present application, further, the fixing plate 1 and the connector 4 are of an integral structure, as Figure 1 , Figure 2 and Figure 3 shown.

[0115] If the fixing plate 1 and the connector 4 adopt an integral structure, after assembling the fixing plate 1 and the circuit board 2, the pins 42 of the connector 4 are also accurately positioned synchronously with the circuit board 2, and then a fixed connection can be made, which omits the positioning process between the connector 4 and the circuit board 2, thereby further improving the assembly efficiency.

[0116] At the same time, the fixing plate 1 also plays a role in fixing the connector 4, omitting the mechanical fixing connection process between the sleeve 41 of the connector 4 and other components such as the fixing plate 1 or the end cover 3, and also improving the assembly efficiency.

[0117] In addition, the fixing plate 1 and the connector 4 can be integrally formed by injection molding or the like, and the seals between the connector 4 and other components such as the fixing plate 1 or the end cover 3 are also omitted, reducing the number of components of the pump device 200 and making the structure simpler.

[0118] Specifically, the fixing plate 1 is a plastic part.

[0119] The fixing plate 1 being a plastic part is convenient for processing various required shapes through injection molding to meet the requirements of the product structure and performance; and it is convenient for integrally injection molding with the connector 4 to achieve an integral structure.

[0120] In an embodiment of the present application, specifically, as Figure 2 shown, the fixing plate 1 includes: a fixing plate body 11 and at least one fixing portion 12. The fixing plate body 11 is provided with an avoidance notch 111 and is connected to the end cover 3. The fixing portion 12 protrudes from the surface of the fixing plate body 11 facing the circuit board 2.

[0121] Among them, the circuit board 2 is provided with at least one first connection hole 26, and the fixing part 12 is matched with the first connection hole 26, so that the circuit board 2 is fixedly connected to the fixing plate 1.

[0122] The fixing plate 1 includes a fixing plate body 11 and at least one fixing part 12. The fixing plate body 11 is the main part of the fixing plate 1, which can support the circuit board 2 and realize the connection function with the end cover 3. By reasonably designing the shape of the fixing plate body 11, the required avoidance notch 111 can be formed to meet the different requirements of different products. The fixing part 12 is matched with the first connection hole 26 of the circuit board 2 to realize the fixing of the fixing plate 1 to the circuit board 2 and ensure the stability of the circuit board 2.

[0123] At the same time, the fixing part 12 protrudes on the surface of the fixing plate body 11 facing the circuit board 2, which can make a certain distance between the fixing plate body 11 and the circuit board 2, facilitating the avoidance of components on the circuit board 2, being beneficial to the reasonable layout of the components on the circuit board 2, and also facilitating the heat dissipation of the circuit board 2.

[0124] Among them, the number of the fixing parts 12 can be one, with a simpler structure, or multiple. For the case where the number of the fixing parts 12 is multiple, the multiple fixing parts 12 are arranged at intervals along the circumferential direction of the fixing plate body 11, which is beneficial to the balanced force of the circuit board 2, thereby improving the fixing reliability of the circuit board 2.

[0125] In a specific example of the present application, the fixing part 12 and the first connection hole 26 are fixedly connected by a fastener 53. The fixing part 12 and the first connection hole 26 are fixedly connected by a fastener 53 such as a screw, with high connection strength and firm fixing.

[0126] In another specific example of the present application, the fixing part 12 and the first connection hole 26 are riveted and fixed. The fixing part 12 and the first connection hole 26 are riveted and fixed, and the connection strength is also relatively high, with relatively firm fixing.

[0127] In yet another specific example of the present application, the fixing part 12 includes at least one buckle 122, as Figure 2 shown. The buckle 122 is snap-fitted with the first connection hole 26.

[0128] The fixing part 12 includes at least one buckle 122. The buckle 122 passes through the first connection hole 26 and is snap-fitted with the circuit board 2. Compared with the screw connection method, the assembly method is simpler and faster, which is beneficial to simplifying the assembly process and further improving the assembly efficiency.

[0129] Among them, the number of the buckles 122 can be one or multiple. For example, two buckles 122 are arranged back to back.

[0130] In an embodiment of the present application, further, the fixing plate 1 further includes: a sealing boss 13, as Figure 2 shown. The sealing boss 13 is provided on the surface of the fixing plate body 11 facing the circuit board 2 and is arranged along the circumference of the avoidance notch 111. And the shape of the sealing boss 13 is adapted to the inner wall surface of the housing 72 of the pump device 200. A first sealing groove 131 for installing the first sealing ring 51 is provided on the outer side wall of the sealing boss 13.

[0131] The fixing plate 1 further includes a sealing boss 13. Since the sealing boss 13 is arranged along the circumference of the fixing plate body 11, it forms an annular structure. Since the shape of the sealing boss 13 is adapted to the inner wall surface of the housing 72, it can be embedded into the housing 72. In this way, a first sealing groove 131 is provided on the outer side wall of the sealing boss 13. After installing the first sealing ring 51, a part of the first sealing ring 51 is embedded into the first sealing groove 131 and abuts against the inner wall surface of the housing 72 (as Figure 7 and Figure 8 shown), that is: the first sealing ring 51 is clamped between the inner wall surface of the housing 72 and the sealing boss 13, so as to realize the radial seal between the fixing plate 1 and the housing 72. This is beneficial to reducing the wall thickness of the housing 72 and preventing the problem that it is difficult to open a sealing groove due to the too thin wall thickness of the housing 72, thus meeting the sealing requirements of products with high requirements for the wall thickness of the housing 72.

[0132] At the same time, the circuit board 2 and the motor are arranged on the same side of the fixing plate 1. When the space is limited, for example, the inner and outer diameters of the housing 72 are not easy to adjust, and the outer diameter of the circuit board 2 is not easy to adjust, resulting in a very thin wall thickness of the housing 72 and no space to set an axial sealing groove, and radial sealing must be adopted, the radial seal between the fixing plate 1 and the housing 72 can be conveniently realized by using this solution, and an axial sealing ring or a radial sealing ring can be added between the fixing plate 1 and the end cover 3, so that the installation of the sealing ring becomes very simple.

[0133] In a specific example of the present application, further, the circuit board 2 is provided with a second welding hole 25, as Figure 2 shown. The second welding hole 25 is welded and fixed to the pin 42.

[0134] This solution realizes the welding and fixing of the circuit board 2 and the pin 42 of the connector 4. The welding process is relatively mature, the process is relatively simple, and the cost is low.

[0135] Specifically, during assembly, the pin 42 is inserted into the second welding hole 25 along the direction from the end cover 3 to the fixing plate 1, and then the second welding hole 25 is used to weld and fix the pin 42. After the circuit board 2 is welded and fixed to the pin 42, the motor terminal 71 is welded and fixed to the circuit board 2. Since the volume of the connector is relatively small, it will not interfere with the welding of the motor terminal 71, thereby ensuring that the welding of the circuit board 2 to the motor terminal 71 and the welding to the pin 42 are easy to achieve.

[0136] In another specific example of the present application (not shown in the figure), the pin 42 is a press-fit terminal, the circuit board 2 is provided with a plug-in hole, and the press-fit terminal is interference-fitted with the plug-in hole. In other words, the circuit board 2 and the pin 42 are connected by a pressfit process (press-fit process).

[0137] The connection between the circuit board 2 and the pin 42 of the connector is realized by using the pressfit process, that is, the pin 42 adopts a press-fit terminal (i.e., a press-fit pin), and the circuit board 2 is provided with a plug-in hole adapted to the pin 42. The pin 42 and the plug-in hole are made to have an interference fit by press-fitting, so as to realize the electrical connection between the pin 42 and the circuit board 2. In this case, the fixing plate can provide support for the circuit board 2, thereby ensuring that the circuit board 2 will not be damaged when the pin 42 is plugged into the circuit board 2. Compared with the solution that the circuit board 2 and the motor terminal and the pin 42 of the connector are all fixed by welding, this solution can save a welding process, save a welding machine, and is also conducive to cost saving.

[0138] In another specific example of the present application, the circuit board 2 assembly structure of the pump device 200 further includes an electrical plug-in 8 (such as Figure 17 The electrical plug-in 8 is disposed on the circuit board 2 and is electrically connected to the circuit board 2. The electrical plug-in 8 includes a socket 8211 and an elastic conductive portion 81, as shown in FIG. Figure 19 The pin 42 passes through the end cover and is plugged into the plug hole 8211 and contacts the elastic conductive part 81 .

[0139] The plug-in connection between the plug pin 42 of the connector and the circuit board 2 is realized by using the electrical plug-in 8, and the solder-free fixation is realized, and the operation method is relatively simple. At the same time, since the elastic conductive part 81 of the electrical plug-in 8 can be elastically deformed, the resistance encountered by the plug pin 42 when inserted into the plug hole 8211 can be significantly reduced, thereby significantly reducing the operating force when the plug pin 42 is plugged into the circuit board 2, greatly reducing the difficulty of assembling the plug pin 42 and the circuit board 2; and the resetting elastic force of the elastic conductive part 81 can be used to ensure good contact between the elastic conductive part 81 and the plug pin 42, thereby improving the matching reliability of the plug pin 42 and the electrical plug-in 8.

[0140] Compared with the pressfit process, the plugging and unplugging method of the pin 42 and the electrical component 8 in this solution is simpler, the requirements for the pressing force and positioning accuracy are significantly reduced, the assembly is convenient and fast, which is conducive to reducing the assembly cost; and the pin 42 can use ordinary pins, which is conducive to reducing the production cost.

[0141] Furthermore, the number of the electrical components 8 is equal to and corresponds one by one with the number of the pins 42. One pin 42 is plugged and cooperated with one electrical component 8, which is conducive to improving the connection reliability between the pin 42 and the circuit board 2.

[0142] In an embodiment of the present application, the electrical component 8 further includes: a connection base 82, as Figure 19 and Figure 20 shown. The connection base 82 is fixedly connected to the circuit board 2. The connection base 82 is provided with a jack 8211. The elastic conductive part 81 includes at least one elastic piece 811, as Figure 19 and Figure 20 shown. One end of the elastic piece 811 is connected to the connection base 82, the other end of the elastic piece 811 forms a free end, and the free end extends obliquely towards the direction close to the central axis of the jack 8211, as Figure 20 shown.

[0143] The electrical component 8 further includes a connection base 82. The connection base 82 is fixedly connected to the circuit board 2 to realize the mechanical connection and electrical connection between the electrical component 8 and the circuit board 2. The connection base 82 is provided with a jack 8211 for the pin 42 of the connector 4 to insert. The elastic conductive part 81 includes at least one elastic piece 811. The form of the elastic piece 811 is conducive to increasing the contact area between the elastic conductive part 81 and the pin 42, and further improving the electrical connection reliability between the pin 42 and the electrical component 8. One end of the elastic piece 811 is connected to the connection base 82 to ensure the electrical connection among the pin 42, the elastic piece 811, the connection base 82 and the circuit board 2. The other end of the elastic piece 811 forms a free end, and the free end extends obliquely towards the reverse direction of the central axis of the jack 8211. When the pin 42 passes through the jack 8211 and contacts the elastic piece 811, the elastic piece 811 will be extruded towards the direction away from the central axis of the jack 8211. Under the action of the restoring elastic force of the elastic piece 811, the elastic piece 811 will maintain good contact with the pin 42, so as to realize the elastic plugging and unplugging cooperation between the pin 42 and the electrical component 8 and ensure the reliable connection between the pin 42 and the electrical component 8.

[0144] In an embodiment of the present application, the number of the elastic pieces 811 is multiple. The multiple elastic pieces 811 are arranged along the circumferential direction of the jack 8211, and the pin 42 contacts the multiple elastic pieces 811.

[0145] The number of the elastic pieces 811 is designed to be multiple, and the multiple elastic pieces 811 are arranged along the circumferential direction of the jack 8211. After the pin 42 is inserted into the jack 8211, it can contact with the multiple elastic pieces 811, further increasing the contact area between the pin 42 and the elastic conductive part 81, and further improving the connection reliability between the pin 42 and the electrical connector 8.

[0146] Meanwhile, the acting forces of the multiple elastic pieces 811 are also beneficial to the balanced force on the pin 42 in the circumferential direction, preventing the pin 42 from tilting, shifting and other situations, thereby further improving the connection reliability between the pin 42 and the electrical connector 8. Before the pin 42 is inserted, the distance between the free ends of the multiple elastic pieces 811 is relatively small. During the insertion process of the pin 42, the distance between the free ends of the multiple elastic pieces 811 gradually increases, and the pin 42 is clamped, ensuring the reliable fixation of the pin 42.

[0147] In a specific example, the number of the elastic pieces 811 is two, and the two elastic pieces 811 are arranged oppositely, as Figure 20 shown. Compared with the scheme of more elastic pieces 811, the structure of the two elastic pieces 811 is simpler, which is convenient for processing and forming, and reduces the production cost.

[0148] In an embodiment of the present application, as Figure 18 shown, the connection base 82 includes: at least one pad 822 and a bracket 821. Wherein, the pad 822 is fixedly welded to the circuit board 2. The bracket 821 is connected to the pad 822, the bracket 821 is provided with a jack 8211, and is connected to one end of the elastic piece 811, and the bracket 821 is provided with an avoidance space 823 for the elastic piece 811 to elastically deform, as Figure 18 shown.

[0149] The connection base 82 includes a bracket 821 and at least one pad 822. The pad 822 is fixedly welded to the circuit board 2 to realize the fixed connection and electrical connection between the connection base 82 and the circuit board 2. The bracket 821 is connected to the pad 822 and the elastic piece 811 to realize the electrical connection between the bracket 821, the pad 822 and the elastic piece 811. The bracket 821 is provided with a jack 8211 for the pin 42 to insert, and the bracket 821 is provided with an avoidance space 823 to facilitate the avoidance of the elastic piece 811, so that the elastic piece 811 is easy to elastically deform, which is beneficial to further reducing the insertion force of the pin 42, thereby further reducing the assembly difficulty.

[0150] In a specific embodiment, as Figures 17 to 20As shown, the electrical plug-in 8 can also be called a plug spring. The electrical plug-in 8 is a metal sheet metal part with two pads 822, which is fixed to the circuit board 2 by welding. There is a socket 8211 on the electrical plug-in 8, and two springs 811 are below the socket 8211. When not assembled, they are relatively close. The pin 42 passes through the socket 8211 and contacts the spring 811. The spring 811 opens and is pressed against the pin 42 by the original pre-tightening force to achieve electrical connection. This structure does not require welding and is easy to assemble. The size of the socket 8211 and the distance between the springs 811 can be flexibly adjusted to accommodate pins 42 of various lengths and widths.

[0151] In one embodiment of the present application, Figure 21 As shown, the pad 822 is welded and fixed to the board surface of the circuit board 2 facing the end cover 3. One end of the bracket 821 is connected to the pad 822. The other end of the bracket 821 passes through the circuit board 2 and extends to the side of the circuit board 2 facing away from the end cover 3.

[0152] In this solution, the bracket 821 passes through the circuit board 2. Since the circuit board 2 has a certain thickness, it is equivalent to forming a reinforcing structure on the periphery of the bracket 821, which can support and fix the bracket 821 and reduce the risk of deformation such as tilting and shifting of the bracket 821, thereby improving the reliability of the electrical plug-in 8.

[0153] In one embodiment of the present application, further, the end cover 3 is provided with an assembly hole 311, such as Figure 3 The assembly hole 311 and the sleeve 41 are clearance-matched.

[0154] The assembly hole 311 of the end cover 3 is clearance-matched with the sleeve 41 of the connector 4. Since the assembly hole 311 has a certain depth, it is equivalent to adding a structure to support and strengthen the sleeve 41 on the outer periphery of the sleeve 41, which can effectively prevent the connector 4 from tilting, deforming, etc. during the process of plugging and unplugging with the female end, thereby improving the plugging and unplugging force of the connector 4, improving the reliability of the connector 4, and helping to extend the service life of the connector 4.

[0155] The assembly hole 311 and the avoidance gap 111 are staggered.

[0156] The assembly hole 311 is staggered with the avoidance gap 111 , so that the connector 4 is also staggered with the avoidance gap 111 , which helps to avoid interference between the connector 4 and components corresponding to the avoidance gap 111 on the circuit board 2 , and helps to optimize the layout of the circuit board 2 .

[0157] Furthermore, the circuit board assembly structure 100 of the pump device 200 further includes: a reinforcing boss 34, such as Figure 3As shown in the figure. The reinforcing boss 34 is provided on the surface of the end cover 3 facing away from the fixing plate 1, and is arranged along the circumferential direction of the assembly hole 311. The reinforcing boss 34 is in clearance fit with the sleeve 41.

[0158] The setting of the reinforcing boss 34 is equivalent to deepening the depth of the assembly hole 311 in disguise, so that the end cover 3 can play a more reliable supporting and strengthening role for the sleeve 41 of the docking plug 4, thereby further improving the insertion and extraction force of the plug 4, further improving the use reliability of the plug 4, and further extending the service life of the plug 4.

[0159] In an embodiment of the present application, further, the circuit board 2 includes: a circuit board body 21 and first surface components 22. Among them, the surface of the circuit board body 21 facing the fixing plate 1 is provided with a heat dissipation area 211. The heat dissipation area 211 is correspondingly arranged with the avoidance notch 111, as Figure 5 shown in the figure. The first surface components 22 include at least one heat dissipation element 221, and at least one heat dissipation element 221 is arranged in the heat dissipation area 211.

[0160] The circuit board 2 includes a circuit board body 21 and first surface components 22. The first surface components 22 include at least one heat dissipation element 221. The setting of the heat dissipation element 221 facilitates the timely dissipation of the heat generated by the circuit board 2, prevents the circuit board 2 from malfunctioning due to excessive temperature rise during use, thereby improving the use reliability of the circuit board 2, and further improving the use reliability of the pump device 200.

[0161] The surface of the circuit board body 21 facing the fixing plate 1 is provided with a heat dissipation area 211. All the heat dissipation elements 221 of the first surface components 22 are concentrated in the heat dissipation area 211, so that the heat dissipation elements 221 can be concentrated and exposed in the avoidance notch 111, which is beneficial to improving the heat dissipation effect of the circuit board 2, and also facilitates the heat dissipation elements 221 to contact the end cover 3 with better thermal conductivity, and then dissipate heat efficiently through the end cover 3 to further improve the heat dissipation effect. At the same time, it is also beneficial to simplify the shape of the avoidance notch 111, make the shape of the avoidance notch 111 more regular, thereby reducing the processing difficulty of the fixing plate 1 and reducing the production cost.

[0162] As for the specific shape and size of the avoidance notch 111, it can be reasonably designed in combination with the specific structure of the components of the circuit board 2 to facilitate the layout and position adjustment of the components.

[0163] Among them, the heat dissipation element 221 includes but is not limited to components such as MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors, abbreviated as Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), which are field-effect transistors that can be widely used in analog circuits and digital circuits), chips, etc. These components generate a large amount of heat during use, so good heat dissipation needs to be ensured.

[0164] In an embodiment of the present application, further, the circuit board assembly structure 100 of the pump device 200 further includes: a heat conduction structure 5, as Figure 4 shown. The heat conduction structure 5 is provided between the heat dissipation element 221 and the end cover 3, and is in contact with the heat dissipation element 221 and the end cover 3, and the end cover 3 is a metal part.

[0165] By adding the heat conduction structure 5 between the heat dissipation element 221 and the end cover 3, and the end cover 3 is made of a metal part, since the metal and the heat conduction structure 5 have good heat conduction performance, the heat of the heat dissipation element 221 can be quickly transferred to the end cover 3 through the heat conduction structure 5, and then dissipated outward, which greatly improves the heat dissipation performance of the product and significantly improves the heat dissipation effect.

[0166] At the same time, since all the heat dissipation elements 221 of the components on the first board surface 22 are concentrated in the heat dissipation area 211, it is convenient for the one-time arrangement of the heat conduction structure 5. For example: when applying thermal paste on the heat dissipation element 221, all the heat dissipation elements 221 in the heat dissipation area 211 can be applied at one time; or when applying thermal paste on the end cover 3 and buckling the end cover 3, the thermal paste is attached to all the heat dissipation elements 221 in the heat dissipation area 211 at one time.

[0167] As for the specific material of the end cover 3, it can be a metal such as aluminum, copper, or iron.

[0168] Specifically, the heat conduction structure 5 includes at least one of thermal paste and thermal pads.

[0169] The thermal paste is set by smearing, with a simple process and low cost. Specifically, it can be smeared on at least one of the heat dissipation element 221 and the end cover 3, and is relatively convenient to use.

[0170] The thermal pad can also be fixed by pasting, or directly clamped between the heat dissipation element 221 and the end cover 3, and also has the advantages of simple structure, convenient assembly, and low cost.

[0171] In an embodiment of the present application, further, the end cover 3 includes: an end cover body 31 and a heat dissipation boss 32, as Figure 2As shown in the figure. The heat dissipation boss 32 is provided on the surface of the end cover body 31 facing the fixing plate 1 and is correspondingly arranged with the heat dissipation element 221. Among them, the heat conduction structure 5 is provided between the heat dissipation element 221 and the heat dissipation boss 32 and is in contact with the heat dissipation element 221 and the heat dissipation boss 32.

[0172] The end cover 3 includes an end cover body 31 and a heat dissipation boss 32. The end cover body 31 is connected to the fixing plate 1. The pin 42 of the contact member passes through the end cover body 31 and is electrically connected to the circuit board 2, realizing the cooperation of the end cover 3 with the fixing plate 1 and the connector 4. The setting of the heat dissipation boss 32 is beneficial to further increasing the heat dissipation area of the end cover 3, thereby further improving the heat dissipation effect. At the same time, it is also beneficial to reducing the thickness of the heat conduction structure 5, simplifying the heat conduction structure 5, and thus reducing the cost of the heat conduction structure 5.

[0173] In an embodiment of the present application, further, the circuit board assembly structure 100 of the pump device 200 further includes: heat dissipation fins 27, as Figure 8 shown. The heat dissipation fins 27 are provided on the surface of the end cover 3 facing away from the fixing plate 1.

[0174] Setting the heat dissipation fins 27 on the surface of the end cover 3 facing away from the fixing plate 1 can further increase the heat dissipation area of the product, thereby further improving the heat dissipation performance of the product.

[0175] In an embodiment of the present application, further, the circuit board 2 further includes: second board surface components 23, as Figure 3 shown. The second board surface components 23 are provided on the surface of the circuit board body 21 facing away from the fixing plate 1. The second board surface components 23 include a capacitor element 231 and an inductor element 232.

[0176] Some of the capacitor elements 231 and inductor elements 232 are relatively large in volume and high in height. These elements are uniformly arranged on the surface of the circuit board body 21 facing away from the fixing plate 1, so that they are located on the same side of the circuit board 2, facilitating the rational use of the axial space between the circuit board 2 and the motor; and compared with being separated on both sides of the circuit board body 21, this solution is beneficial to reducing the axial dimension of the circuit board 2, and thus beneficial to reducing the axial dimension of the motor.

[0177] In an embodiment of the present application, further, the first board surface components 22 include a grounding element 222, as Figure 3 shown. The grounding element 222 is in contact with the end cover 3, and the end cover 3 is a metal part.

[0178] When the end cap 3 is made of a metal part, since the metal has a conductive function, when the grounding element 222 of the circuit board 2 is in physical contact with the end cap 3 made of a metal material, electrical connection can be achieved, thereby realizing the grounding design of the circuit board 2, improving the anti-electromagnetic interference ability of the circuit board 2, and thus improving the electromagnetic compatibility of the product, that is, improving the EMC performance of the product.

[0179] Further, the end cap 3 has a grounding boss 35, as Figure 2 shown. The grounding element 222 contacts the grounding boss 35. The grounding element 222 can specifically be but is not limited to a grounding spring piece.

[0180] In an embodiment of the present application, the end cap 3 includes: an end cap body 31 and a positioning boss 33, as Figure 2 shown. The positioning boss 33 is provided on the surface of the end cap body 31 facing the fixing plate 1 and is adapted to the shape of the avoiding notch 111. The positioning boss 33 is embedded in the avoiding notch 111.

[0181] The end cap 3 includes the end cap body 31 and the positioning boss 33. Since the positioning boss 33 is adapted to the shape of the avoiding notch 111, during assembly, the positioning boss 33 can be directly embedded in the avoiding notch 111 to realize the relative fixation of the end cap 3 and the fixing plate 1, playing a good role in assembly positioning, thereby further improving the assembly efficiency.

[0182] Further, the circuit board assembly structure 100 of the pump device 200 further includes: a second sealing ring 52, as Figure 7 and Figure 8 shown. The second sealing ring 52 is provided between the end cap 3 and the fixing plate 1.

[0183] Setting the second sealing ring 52 between the end cap 3 and the fixing plate 1 can ensure the sealing reliability between the end cap 3 and the fixing plate 1, prevent liquid from entering the pump device 200 through the gap between the end cap 3 and the fixing plate 1, and thus improve the use reliability of the pump device 200.

[0184] In a specific example, a second sealing groove 331 is provided on the outer side wall of the positioning boss 33 of the end cap 3, as Figure 2 shown. The second sealing groove 331 is arranged along the circumferential direction of the avoiding notch 111. The second sealing ring 52 is embedded in the second sealing groove 331 and abuts against the fixing plate 1.

[0185] By providing the second sealing groove 331 on the outer side wall of the positioning boss 33 of the end cap 3 and installing the second sealing ring 52 at the second sealing groove 331, after assembly, the second sealing ring 52 is clamped between the outer side wall of the positioning boss 33 and the fixing plate 1, playing a role of radial sealing for the fixing plate 1 and the end cap 3. This solution is beneficial to reducing the thickness of the fixing plate 1 and the end cap body 31, and further beneficial to reducing the axial dimension of the pump device 200.

[0186] In another specific example (not shown in the figure), one of the plate surfaces of the fixing plate 1 facing the end cover 3 and the plate surface of the end cover 3 facing the fixing plate 1 is provided with a second sealing groove 331. The second sealing groove 331 is arranged along the circumferential direction of the avoidance notch 111. The second sealing ring 52 is embedded in the second sealing groove 331 and abuts against the fixing plate 1 and the end cover 3.

[0187] When the thickness of the fixing plate 1 and / or the thickness of the end cover 3 are sufficient, a second sealing groove 331 can be correspondingly provided on the plate surface of the fixing plate 1 facing the end cover 3 and / or the plate surface of the end cover 3 facing the fixing plate 1. After assembly, the second sealing ring 52 can achieve axial sealing between the fixing plate 1 and the end cover 3, and can also ensure the sealing reliability between the end cover 3 and the fixing plate 1.

[0188] In an embodiment of the present application, specifically, the fixing plate 1 is provided with a second connection hole 112, as Figure 2 shown. The end cover 3 is provided with a third connection hole 312, as Figure 2 shown. The second connection hole 112 and the third connection hole 312 are for a fastener 53 to pass through, so that the fixing plate 1 and the end cover 3 are fixedly connected by the fastener 53.

[0189] By providing a second connection hole 112 on the fixing plate 1 and correspondingly providing a third connection hole 312 on the end cover 3, during assembly, the fixing plate 1 and the end cover 3 can be fixedly connected by using fasteners 53 such as screws. The structure is simple and the fixation is firm.

[0190] Furthermore, the number of the second connection holes 112 is multiple. The multiple second connection holes 112 are arranged at intervals along the circumferential direction of the fixing plate 1. The number of the third connection holes 312 is equal to the number of the second connection holes 112 and they correspond one by one. In this way, the end cover 3 and the fixing plate 1 are fixedly connected by multiple fasteners 53, and the connection is more reliable.

[0191] In an embodiment of the present application, the end cover 3 is a plastic part.

[0192] For products with low heat dissipation requirements, the end cover 3 is made of a plastic part. Compared with a metal part, it can reduce the weight of the product and the cost of the product.

[0193] As Figure 6 、 Figure 9 and Figure 10 shown, a pump device 200 provided by an embodiment of the second aspect of the present application includes: a pump part 6, a motor part 7, and a circuit board assembly structure 100 of the pump device 200 according to any one of the embodiments of the first aspect.

[0194] Specifically, the pump unit 6 is provided with an inlet 61 and an outlet 62. The motor unit 7 is connected to the pump unit 6. The motor unit 7 includes motor terminals 71. The circuit board assembly structure 100 is connected to the motor unit 7, and the motor terminals 71 are fixedly welded to the first welding holes 24 of the circuit board assembly structure 100, as Figure 7 and Figure 8 shown.

[0195] The pump device 200 provided by the embodiment of the second aspect of the present application includes the circuit board assembly structure 100 of the pump device 200 in any one of the embodiments of the first aspect, and thus has all the beneficial effects of any of the above embodiments, which will not be elaborated here.

[0196] In an embodiment of the present application, the motor unit 7 includes a housing 72. The fixing plate 1 and the end cover 3 of the circuit board assembly structure 100 are fixedly connected to the housing 72 through fasteners 53, as Figure 7 and Figure 8 shown.

[0197] The fixing connection between the fixing plate 1, the end cover 3 and the housing 72 is realized through fasteners 53 such as screws. The fixing is firm, the assembly is simple, and it is beneficial to simplify the assembly process. Specifically, fasteners 53 such as screws pass through the second connection holes 112 on the end cover 3 and the third connection holes 312 on the fixing plate 1 to be fixedly connected to the housing 72.

[0198] In an embodiment of the present application, the housing 72 is a metal part.

[0199] The housing 72 is made of a metal part. Since the metal has good heat conduction performance, it is beneficial to the heat dissipation of the product.

[0200] Furthermore, for the end cover 3 made of a metal part, the end cover 3 contacts the grounding element 222 of the circuit board 2, and the end cover 3 is fixedly connected to the housing 72 through conductive fasteners such as screws. Then the end cover 3 can conduct electricity through the conductive screws and the housing 72 made of metal material; or the end cover 3 is directly connected to the housing 72, then the end cover 3 can directly conduct electricity with the housing 72 made of metal material. In this way, the housing 72 is also indirectly electrically connected to the grounding element 222 of the circuit board 2, realizing the grounding design, thereby further improving the electromagnetic compatibility of the product, that is, further improving the EMC performance of the product.

[0201] In some embodiments, the pump device 200 is an oil pump, and the medium flowing inside is liquid oil. A pump chamber and a motor chamber are provided in the housing 72, and the pump chamber and the motor chamber are separated by an oil seal 76. As Figure 7 and Figure 8 shown, the motor unit 7 includes a stator assembly 74, a rotor assembly 73 and a rotating shaft 75. The stator assembly 74 and the rotor assembly 73 are arranged in the motor chamber, and the coil of the stator assembly 74 is electrically connected to the motor terminals 71.

[0202] As Figure 12 and Figure 14 shown, the pump section 6 includes a pump cover 65 and an inner gear 63 and an outer gear 64 disposed in the pump chamber. The pump cover 65 is provided with the above-mentioned input port 61 and output port 62. The rotating shaft 75 extends from the motor chamber to the pump chamber and is coaxially connected to the inner gear 63. The outer gear 64 is sleeved outside the inner gear 63 and is eccentrically disposed relative to the inner gear 63. The rotating shaft 75 drives the inner gear 63 to rotate, and the inner gear 63 drives the outer gear 64 to rotate. An oil chamber is formed between the outer gear 64 and the inner gear 63. The oil chamber includes a first pressure chamber 66 communicating with the input port 61 and a second pressure chamber 67 communicating with the output port 62. The oil pressure in the first pressure chamber 66 is lower than the oil pressure in the second pressure chamber 67. Therefore, the first pressure chamber 66 and the second pressure chamber 67 can be respectively referred to as a low-pressure chamber and a high-pressure chamber. As the inner gear 63 and the outer gear 64 rotate, a negative pressure is generated at the oil suction port, so that the first pressure chamber 66 sucks oil from the oil suction port, and the second pressure chamber 67 discharges the oil from the output port 62 by using the pressure difference.

[0203] Furthermore, as Figure 12 and Figure 14 shown, the housing 72 has a first bearing portion 725, and the pump cover 65 has a second bearing portion 657. The rotating shaft 75 passes through the first bearing portion 725 and the second bearing portion 657 and has a clearance fit with the first bearing portion 725 and the second bearing portion 657. In this way, the double support of the rotating shaft 75 is realized by using the first bearing portion 725 and the second bearing portion 657, which is beneficial to improving the position stability of the rotating shaft 75, and the rolling bearing is cancelled, reducing the production cost of the product.

[0204] Furthermore, a first lubricating oil path is provided in the housing 72. Both ends of the first lubricating oil path are respectively communicated with the first pressure chamber 66 and the second pressure chamber 67, so that the oil in the second pressure chamber 67 can flow into the first pressure chamber 66 through the first lubricating flow path to realize the lubrication between the first bearing portion 725 and the rotating shaft 75. Specifically, as Figure 12 and Figure 14As shown, the first lubricating oil path includes a first throttling groove 721, a first lubricating groove 722, a first circulation groove 723, and a pressure relief hole 724. One end of the first throttling groove 721 communicates with the second pressure chamber 67, and the other end extends to the inner wall surface of the first bearing portion 725. The first lubricating groove 722 is formed on the inner wall surface of the first bearing portion 725 and communicates with the first throttling groove 721. The first circulation groove 723 is provided between the first bearing portion 725 and the oil seal 76 and is arranged along the circumferential direction of the rotating shaft 75. The pressure relief hole 724 is provided on the housing 72, and both ends thereof communicate with the first circulation groove 723 and the first pressure chamber 66 respectively. During use, part of the oil in the second pressure chamber 67 enters the first bearing portion 725 through the first throttling groove 721, enters the first circulation groove 723 along the first lubricating groove 722, then enters the pressure relief hole 724 along the first circulation groove 723, and enters the first pressure chamber 66 through the pressure relief hole 724. The oil in the first pressure chamber 66 can enter the second pressure chamber 67 with the rotation of the inner gear 63 and the outer gear 64, and then be discharged through the output port 62. In this way, an oil path circulation is formed.

[0205] In one embodiment, further, as Figure 12 and Figure 13 shown, the pump cover 65 is provided with a second lubricating oil path for supplying oil between the second bearing portion 657 and the rotating shaft 75 to achieve lubrication of the second bearing portion 657 and the rotating shaft 75. Both ends of the second bearing portion 657 are open, and the end of the second bearing portion 657 away from the inner gear 63 communicates with the oil storage portion. The second lubricating oil path includes a second lubricating groove 651 and a thrust lubricating groove 652. The second lubricating groove 651 is formed on the inner wall surface of the second bearing portion 657, and the thrust lubricating groove 652 is formed on the end surface of the second bearing portion 657 facing the inner gear 63. The thrust lubricating groove 652 communicates with the first lubricating groove 722 and the first pressure chamber 66. During use, the oil in the oil storage portion is divided into two paths. One path enters the first pressure chamber 66 through the input port 61, then enters the second pressure chamber 67, and is discharged through the output port 62. The other path enters the second bearing portion 657 through the second lubricating groove 651, then enters the thrust lubricating groove 652, then enters the first pressure chamber 66, enters the second pressure chamber 67 with the oil in the first pressure chamber 66, and is then discharged through the output port 62. At the same time, the oil in the thrust lubricating groove 652 can also play a certain reverse supporting role for the second bearing portion 657 and the inner gear 63 to prevent excessive friction between the inner gear 63 and the second bearing portion 657.

[0206] In another embodiment, as Figure 14 and Figure 15As shown, the end of the second bearing portion 657 away from the internal gear 63 can also adopt a closed design. At this time, the second lubricating oil path includes a throttle hole 653, an oil sump 656, a second lubricating groove 651, a second flow groove 654, and a second throttle groove 655. One end of the throttle hole 653 communicates with the output port 62, and the other end extends into the second bearing portion 657. The oil sump 656 is located inside the second bearing portion 657 and has a certain distance from the end face of the rotating shaft 75. The second lubricating groove 651 is provided on the inner wall surface of the second bearing portion 657. The second flow groove 654 is provided at the open end of the second bearing portion 657 and is arranged along the circumferential direction of the rotating shaft 75, specifically as a chamfer provided at the open end of the second bearing portion 657. The second throttle groove 655 is provided on the end face of the second bearing portion 657 facing the internal gear 63, with one end communicating with the second flow groove 654 and the other end communicating with the input port 61. During use, the oil at the output port 62 enters the oil sump 656 through the throttle hole 653, enters the second lubricating groove 651 through the oil sump 656, enters the second flow groove 654 through the second lubricating groove 651, then enters the input port 61 through the second throttle groove 655, enters the first pressure chamber 66 along with the oil at the input port 61, and then enters the second pressure chamber 67, and finally is discharged through the output port 62.

[0207] As Figure 11 and Figure 16 As shown, a vehicle 300 provided by an embodiment of the third aspect of the present application includes: a vehicle body 302 and the pump device 200 of any one of the embodiments of the second aspect. The pump device 200 is installed on the vehicle body 302.

[0208] Since the vehicle 300 provided by the embodiment of the third aspect of the present application includes the pump device 200 of any one of the embodiments of the second aspect, it has all the beneficial effects of any of the above embodiments, which will not be elaborated here.

[0209] Specifically, the housing 72 has connecting lugs, the vehicle body 302 has fixing holes, and the connecting lugs and the fixing holes are fixedly connected by fasteners 53. The vehicle body 302 includes a driving component 304 and an oil storage portion 306. The pump portion 6 is provided with an input port 61 and an output port 62. The input port 61 communicates with the oil storage portion, and the output port 62 is used to provide a cooling medium (such as cooling oil) for the driving motor.

[0210] It is worth noting that the vehicle 300 can be a traditional fuel vehicle or a new energy vehicle. Among them, new energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc. When the vehicle 300 is a traditional fuel vehicle, the driving component 304 is a fuel engine. When the vehicle 300 is a new energy vehicle, the driving component 304 is a driving motor.

[0211] It can be understood that in the present application, the medium flowing in the pump device 200 is not necessarily liquid oil, but can also be a water-based liquid or other liquid media. The pump device 200 is not necessarily used in a vehicle, but can also be used in other products that require a pump device. Therefore, the installation carrier of the pump device 200 is not limited to the vehicle body 302. Moreover, the specific installation direction of the pump device 200 depends on the product structure. For example: after the pump device 200 is assembled with the installation carrier, it may be consistent with the up and down directions shown in the drawings, that is: the motor part 7 is below and the pump part 6 is above; it can also be installed in the reverse direction, which is exactly opposite to the up and down directions shown in the drawings, that is: the motor part 7 is above and the pump part 6 is below.

[0212] In the present application, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed" should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0213] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0214] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0215] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A circuit board assembly structure of a pump device, characterized in that, Comprising: A fixing plate, the fixing plate is provided with an avoidance notch; A circuit board, the circuit board is located on one side of the fixing plate and is connected to the fixing plate. The circuit board is provided with a first welding hole for the motor terminal of the pump device to be inserted along the direction from the circuit board to the fixing plate and welded to the circuit board, and the first welding hole is correspondingly arranged with the avoidance notch; An end cover, the end cover is located on the other side of the fixing plate and is connected to the fixing plate; A connector, the connector includes a pin and a sleeve sleeved outside the pin, and the pin passes through the end cover and is connected to the circuit board; The circuit board includes: A circuit board body, a heat dissipation area is provided on the board surface of the circuit board body facing the fixing plate, and the heat dissipation area is correspondingly arranged with the avoidance notch; First board surface components, the first board surface components include at least one heat dissipation element, and the at least one heat dissipation element is arranged in the heat dissipation area; The circuit board assembly structure of the pump device further includes: A heat conduction structure, the heat conduction structure is arranged between the heat dissipation element and the end cover and is in contact with the heat dissipation element and the end cover, and the end cover is a metal part; The end cover includes: An end cover body; and A heat dissipation boss, the heat dissipation boss is arranged on the board surface of the end cover body facing the fixing plate and is correspondingly arranged with the heat dissipation element; Wherein, the heat conduction structure is arranged between the heat dissipation element and the heat dissipation boss and is in contact with the heat dissipation element and the heat dissipation boss.

2. The circuit board assembly structure of the pump device according to claim 1, characterized in that The fixing plate and the connector are of an integral structure.

3. The circuit board assembly structure of the pump device according to claim 2, characterized in that, The fixing plate includes: A fixing plate body, the fixing plate body is provided with the avoidance notch and is connected to the end cover; and At least one fixing part, the fixing part protrudes from the board surface of the fixing plate body facing the circuit board; Wherein, the circuit board is provided with at least one first connection hole, and the fixing part is matched with the first connection hole to fixedly connect the circuit board and the fixing plate.

4. The circuit board assembly structure of the pump device according to claim 3, characterized in that The fixing part and the first connection hole are fixedly connected by a fastener, and the fastener is a screw; or The fixing part and the first connection hole are riveted and fixed; or The fixing part includes at least one buckle, and the buckle is snap-fitted with the first connection hole.

5. The circuit board assembly structure of the pump device according to claim 3, characterized in that, The fixing plate further includes: A sealing boss, the sealing boss is arranged on the board surface of the fixing plate body facing the circuit board and is arranged along the circumference of the fixing plate body, and the shape of the sealing boss is adapted to the inner wall surface of the housing of the pump device. A first sealing groove for installing a first sealing ring is provided on the outer side wall of the sealing boss.

6. The circuit board assembly structure of the pump device according to any one of claims 1 to 5, characterized in that The circuit board is provided with a second welding hole, and the second welding hole is fixedly welded with the pin; or The pin is a press-fit terminal, the circuit board is provided with a plugging and unplugging hole, and the press-fit terminal is in interference fit with the plugging and unplugging hole; or The circuit board assembly structure of the pump device further includes an electrical plug-in component. The electrical plug-in component is provided on the circuit board and is electrically connected to the circuit board. The electrical plug-in component includes a jack and an elastic conductive part. The pin passes through the end cover and is inserted into the jack in a mating manner and contacts the elastic conductive part.

7. The circuit board assembly structure of the pump device according to any one of claims 2 to 5, characterized in that The end cover is provided with an assembly hole, and the assembly hole is in clearance fit with the sleeve.

8. The circuit board assembly structure of the pump device according to claim 7, characterized in that The assembly hole and the avoidance notch are arranged staggeredly.

9. The circuit board assembly structure of the pump device according to claim 7, characterized in that, It further includes: A reinforcing boss, which is provided on the surface of the end cover facing away from the fixing plate, is arranged along the circumference of the assembly hole, and the reinforcing boss is in clearance fit with the sleeve.

10. The circuit board assembly structure of the pump device according to any one of claims 2 to 5, characterized in that The fixing plate is a plastic part.

11. The circuit board assembly structure of the pump device according to claim 1, characterized in that The heat-conducting structure includes at least one of heat-conducting glue and a heat-conducting pad.

12. The circuit board assembly structure of the pump device according to claim 1, characterized in that, It further includes: Heat-dissipating fins, which are provided on the surface of the end cover facing away from the fixing plate.

13. The circuit board assembly structure of the pump device according to claim 1, characterized in that, The circuit board further includes: Components on the second board surface, which are provided on the surface of the circuit board body facing away from the fixing plate. The components on the second board surface include capacitor elements and inductor elements.

14. The circuit board assembly structure of the pump device according to claim 1, characterized in that The components on the first board surface include a grounding element, and the grounding element contacts the end cover, and the end cover is a metal part.

15. The circuit board assembly structure of the pump device according to any one of claims 1 to 5, characterized in that, The end cover includes: An end cover body; and A positioning boss, which is provided on the surface of the end cover body facing the fixing plate and is adapted to the shape of the avoidance notch. The positioning boss is embedded in the avoidance notch.

16. The circuit board assembly structure of the pump device according to any one of claims 1 to 5, characterized in that, It further includes: A second sealing ring, which is provided between the end cover and the fixing plate.

17. The circuit board assembly structure of the pump device according to claim 16, characterized in that A second sealing groove is provided on the outer side wall of the positioning boss of the end cover and is arranged along the circumference of the avoidance notch. The second sealing ring is embedded in the second sealing groove and abuts against the fixing plate; or A second sealing groove is provided on one of the surface of the fixing plate facing the end cover and the surface of the end cover facing the fixing plate and is arranged along the circumference of the avoidance notch. The second sealing ring is embedded in the second sealing groove and abuts against the fixing plate and the end cover.

18. The circuit board assembly structure of the pump device according to any one of claims 1 to 5, characterized in that The fixing plate is provided with a second connection hole, and the end cover is provided with a third connection hole. The second connection hole and the third connection hole are for a fastener to pass through, so that the fixing plate and the end cover are fixedly connected through the fastener.

19. The circuit board assembly structure of the pump device according to any one of claims 1 to 5, characterized in that The end cover is a plastic part.

20. A pump device, characterized in that, It includes: A pump section having an inlet and an outlet; A motor section connected to the pump section, the motor section including motor terminals; and A circuit board assembly structure of the pump device according to any one of claims 1 to 19, the circuit board assembly structure being connected to the motor section, and the motor terminals being fixedly welded to the first welding holes of the circuit board assembly structure.

21. The pump device according to claim 20, wherein the motor section includes a housing, and the fixing plate and the end cover of the circuit board assembly structure are fixedly connected to the housing through fasteners.

22. The pump device according to claim 21, wherein the housing is a metal part.

23. A vehicle, characterized in that, Comprising: A vehicle body; and A pump device according to any one of claims 20 to 22, the pump device being mounted on the vehicle body.

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