Winding solder joint cooling component, electric motor and vehicle drive system

Abstract

Provided in the present application is a winding solder joint cooling component, which can be installed on a stator of an electric motor. The winding solder joint cooling component (5) comprises: a cooling tube (51), wherein the cooling tube (51) is a hollow tube; and a fixing block (52) connected to the cooling tube (51), wherein the fixing block (52) is provided with a solder joint accommodating cavity (521), and a terminal solder joint (321) of a winding in the electric motor can be accommodated in the solder joint accommodating cavity (521); the fixing block (52) is made of an insulating material and is used for insulating the terminal solder joint (321) from the cooling tube (51), enabling the cooling tube (51) to be disposed around the terminal solder joint (321); thus, cooling liquid flowing through the cooling tube (51) can provide cooling for the terminal solder joint (321). Further provided are an electric motor and a vehicle drive system.

Description

Winding joint cooling member, motor and vehicle drive system TECHNICAL FIELD

[0001] The present application relates to a drive system of an electric vehicle or a hybrid vehicle and components thereof, in particular to a winding joint cooling member, a motor and a vehicle drive system. BACKGROUND

[0002] For small electric vehicles, the power requirement is low, the peak power of the vehicle drive system can be low, and the expected manufacturing cost is low. Therefore, water cooling is more suitable for the vehicle drive system of a small electric vehicle than oil cooling.

[0003] In a possible vehicle drive system, water cooling is used to form a cooling cavity between the motor housing and the cooling jacket, and the coolant in the cooling cavity can be used to cool the stator core. However, the temperature of the outgoing end joint of the winding is often higher than that of the stator core, and the water-cooled vehicle drive system lacks targeted cooling means for the outgoing end joint, so the cooling effect is not good.

[0004] SUMMARY

[0005] The purpose of the present application is to overcome or at least alleviate the deficiencies of the prior art, and to provide a winding joint cooling member that can cool the outgoing end joint of the motor, so that the cooling effect of the vehicle drive system is better.

[0006] The embodiments of the present application provide a winding joint cooling member, which can be installed on a stator of a motor, and the winding joint cooling member comprises:

[0007] a cooling pipe, which is a hollow pipe; and

[0008] a fixing block connected to the cooling pipe, the fixing block is provided with a joint accommodating groove, the outgoing end joint of the winding of the motor can be accommodated in the joint accommodating groove, the fixing block is made of an insulating material, the fixing block is used to insulate the outgoing end joint and the cooling pipe, the cooling pipe can be arranged around the outgoing end joint, so that the coolant flowing through the cooling pipe can cool the outgoing end joint.

[0009] In at least one possible embodiment, the joint accommodating groove is provided with two, and the two joint accommodating grooves are respectively arranged on the inner and outer sides of the cooling pipe in the radial direction of the motor.

[0010] In at least one possible embodiment, the fixing block is provided with a heat dissipation hole, the heat dissipation hole is in communication with the joint accommodating groove, and the heat dissipation hole forms an opening at the axial end of the fixing block.

[0011] In at least one possible implementation, the cooling pipe includes a fixed portion inserted into the fixed block, and the fixed portion and the welding point accommodating groove are parallel.

[0012] In at least one possible implementation, the cooling pipe and the fixed block are fixedly connected by injection molding.

[0013] The embodiments of the present application also provide an electric machine including the winding welding point cooling member according to any one of the above technical solutions.

[0014] In at least one possible implementation, the electric machine further includes an electric machine shell and a cooling jacket, the cooling jacket is installed on the radially inner side of the electric machine shell, a cooling flow channel is formed between the cooling jacket and the electric machine shell, and both ends of the cooling pipe are communicated with the cooling flow channel.

[0015] In at least one possible implementation, the electric machine includes a stator, the stator includes a winding, the winding includes a wire,

[0016] The outgoing terminal welding point is formed by welding two wires together, and the side wall of the welding point accommodating groove clamps the two wires of the outgoing terminal welding point in the radial direction of the electric machine.

[0017] In at least one possible implementation, the cooling liquid contained in the cooling cavity is water or an aqueous solution, and the electric machine is a water-cooled electric machine.

[0018] The embodiments of the present application also provide a vehicle driving system including the winding welding point cooling member according to any one of the above technical solutions or the electric machine according to any one of the above technical solutions.

[0019] By adopting the above embodiments, the outgoing terminal welding point and the cooling pipe are insulated and separated by the fixed block, the cooling pipe can be arranged around the outgoing terminal welding point, and thus the cooling liquid flowing through the cooling pipe can cool the outgoing terminal welding point, and the cooling effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 shows a schematic diagram of a partial structure of a vehicle driving system according to an embodiment of the present application.

[0021] FIG. 2 shows a perspective view of a partial structure of a vehicle driving system according to an embodiment of the present application.

[0022] FIG. 3 shows a schematic diagram of an internal structure of a vehicle driving system according to an embodiment of the present application.

[0023] FIG. 4 shows a sectional view of a partial structure of a vehicle driving system according to an embodiment of the present application.

[0024] Fig. 5 shows a partial enlarged view of Fig. 4.

[0025] Fig. 6 shows a structural schematic view of a winding joint cooling member of a vehicle drive system according to an embodiment of the present application.

[0026] Fig. 7 shows a structural schematic view of a cooling pipe of a winding joint cooling member of a vehicle drive system according to an embodiment of the present application.

[0027] Fig. 8 shows a structural schematic view of a motor housing of a vehicle drive system according to an embodiment of the present application.

[0028] Fig. 9 shows a structural schematic view of a cooling jacket of a vehicle drive system according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, the specific embodiments of the present application are described in detail in this section in conjunction with the accompanying drawings. In addition to the various embodiments described in this section, the present application can be implemented in other different ways, and those skilled in the art can make corresponding improvements, modifications and substitutions without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed in this section. The scope of protection of the present application should be subject to the claims.

[0030] Referring to Figs. 1 to 9, the embodiments of the present application provide a vehicle drive system which can be used in an electric vehicle or a hybrid vehicle, and the vehicle drive system can include a motor.

[0031] The motor can include a motor housing 1, a cooling jacket 2, a stator 3, a rotor, a busbar 4 and a winding joint cooling member 5.

[0032] The motor housing 1 and the cooling jacket 2 can be cylindrical, and the cooling jacket 2 is installed on the radially inner side of the motor housing 1. The stator 3 can be installed on the radially inner side of the cooling jacket 2, and the rotor can be rotatably installed on the radially inner side of the stator 3, i.e. the motor of the present application can be an outer stator inner rotor motor.

[0033] As shown in Fig. 4, at the axial both ends of the cooling jacket 2, a sealing ring can be arranged between the cooling jacket 2 and the motor housing 1. A cooling cavity (or cooling flow channel) 23 is formed between the cooling jacket 2 and the motor housing 1, and the cooling cavity 23 is used to accommodate a cooling liquid such as water or water solution. The motor is a water-cooled motor, and the cooling liquid can surround the outer periphery of the cooling jacket 2 to cool the stator 3.

[0034] As shown in FIGS. 2 to 4, the stator 3 includes a stator core 31 and a winding 32, the stator core 31 is cylindrical, and an outer circumferential surface of the stator core 31 can be in contact with an inner circumferential surface of the cooling jacket 2. The stator core 31 is provided with winding grooves that penetrate the stator core 31 along the axial direction A of the motor, and the winding 32 can be installed in the winding grooves, and the winding 32 can be exposed from both axial ends of the stator core 31.

[0035] The winding 32 includes a plurality of wires, and at one axial end (winding wire outlet end, upper end in FIGS. 2 and 4) of the motor, a plurality of (for example, two) wires can be welded to form a winding wire outlet end welding point 321. The winding 32 can have a plurality of wire outlet end welding points 321 at one axial end.

[0036] As shown in FIGS. 1 to 7, the winding welding point cooling member 5 can include a cooling pipe 51 and a fixing block 52, and the cooling pipe 51 and the fixing block 52 are connected together. The fixing block 52 can be fan-shaped, and the cooling pipe 51 can be circular in cross-section, and the fixing block 52 can form a through hole that is circular in cross-section and extends along an arc to accommodate the cooling pipe 51.

[0037] Both ends of the cooling pipe 51 can be connected to the cooling jacket 2, and both ends of the cooling pipe 51 are in communication with the cooling cavity 23. The cooling pipe 51 can be a hollow pipe made of metal such as steel or aluminum, and the fixing block 52 can be made of an insulating material such as plastic. Generally, metals have good thermal conductivity, which is conducive to heat exchange between the cooling liquid in the cooling pipe 51 and the outside. The cooling pipe 51 and the fixing block 52 can be fixedly connected by, for example, injection molding.

[0038] The fixing block 52 can be provided with a welding point accommodating groove 521 (see FIG. 6), so that the welding point of the winding 32 at the wire outlet end is accommodated in the welding point accommodating groove 521, and the welding point can contact or even press the wall portion of the welding point accommodating groove 521. The welding point accommodating groove 521 can extend along an arc, and the cross-section of the welding point accommodating groove 521 can be rectangular, and the wire outlet end welding point 321 can be inserted into the welding point accommodating groove 521. The welding point accommodating groove 521 can limit the movement range of the welding point 321, reduce the influence of vibration on the wire outlet end welding point 321, reduce the risk of cracking of the wire outlet end welding point 321, and improve safety.

[0039] The welding point accommodating groove 521 can be provided with two, and the cooling pipe 51 can be located at a middle position of the fixing block 52 in the radial direction R of the motor, and the two welding point accommodating grooves 521 are respectively arranged on the inner and outer sides of the cooling pipe 51 in the radial direction R of the motor. The cooling pipe 51 includes a fixed portion inserted into the fixing block 52, and the fixed portion can be arranged in parallel with the welding point accommodating groove 521.

[0040] Optionally, the outgoing terminal solder joint 321 can be formed by soldering two wires together, and the sidewall of the solder joint accommodating groove 521 can clamp the two wires of the outgoing terminal solder joint 321 in the radial direction R of the motor, so that the solder joint accommodating groove 521 can help reinforce the outgoing terminal solder joint 321 and reduce the risk of cracking of the outgoing terminal solder joint 321.

[0041] At one axial end of the stator 3 (the outgoing terminal of the winding), the bus bar 4 can be connected to the winding 32 by welding, so that the outgoing terminal of the winding 32 can also form a bus bar solder joint.

[0042] The fixing block 52 can insulate the outgoing terminal solder joint 321 from the cooling pipe 51, and the insulating material can allow the cooling pipe 51 and the outgoing terminal solder joint 321 to be relatively close, so that the cooling liquid in the cooling pipe 51 can cool the outgoing terminal solder joint 321. However, the distance between the outgoing terminal solder joint 321 and the cooling pipe 51 is greater than the electrical creepage distance, so that the fixing block 52 does not conduct electricity. The electrical creepage distance is related to the use conditions of the motor, such as power, voltage, etc.

[0043] As shown in FIGS. 2, 3 and 6, the fixing block 52 is provided with a plurality of heat dissipation holes 522, the heat dissipation holes 522 are in communication with the solder joint accommodating groove 521, and the heat dissipation holes 522 can form openings at the axial end of the fixing block 52. The plurality of heat dissipation holes 522 are located at the position of the outgoing terminal solder joint 321, and the heat dissipation holes 522 can expose the outgoing terminal solder joint 321 from the axial end of the fixing block 52 (but the outgoing terminal solder joint 321 does not need to protrude from the surface of the fixing block 52). In this way, the outgoing terminal solder joint 321 can be exposed to air, which helps to dissipate heat and cool the outgoing terminal solder joint 321 by air flow.

[0044] As shown in FIGS. 8 and 9, the axial end of the cooling jacket 2 can be provided with a flange 21, and the flange 21 can extend radially outward from the main body of the cooling jacket 2. The axial end of the motor housing 1 can be provided with a cooling jacket mounting groove 11, and the profile of the cooling jacket mounting groove 11 is the same as that of the flange 21, and the flange 21 can be embedded in the cooling jacket mounting groove 11.

[0045] The outer circumferential surface of the cooling jacket 2 can be provided with an annular protrusion or recess extending in the circumferential direction C of the motor, and the protrusion or recess can be helical.

[0046] The flange 21 can be provided with a cooling pipe mounting hole 22, and the two ends of the cooling pipe 51 can be connected to the cooling pipe mounting hole 22, so that the cooling pipe 51 is connected to the cooling jacket 2.

[0047] As shown in FIG. 5 and FIG. 8, the motor housing 1 can be provided with an axial hole 12 extending along the axial direction of the motor housing 1 and a radial hole 13 extending along the radial direction of the motor housing 1, and the axial hole 12 and the radial hole 13 are communicated. The axial hole 12 is formed in the cooling jacket mounting groove 11, and the radial hole 13 is communicated to the cooling cavity 23. A plug 14 can be provided on the outer circumferential surface of the motor housing 1, and the plug 14 can seal the opening of the radial hole 13 formed on the outer circumferential surface of the motor housing 1.

[0048] In the axial direction A of the motor, the axial extension of the cooling pipe 51, the cooling pipe mounting hole 22, and the axial hole 12 are aligned to communicate the cooling pipe 51 and the cooling cavity 23.

[0049] The motor can be connected with a water pump, and the water pump can provide power to circulate the cooling liquid in the cooling cavity 23 and the cooling pipe 51. The cooling liquid flowing through the cooling cavity 23 can cool the stator 3.

[0050] The single arrow in FIG. 4 indicates the flow direction of the cooling liquid. As shown in FIG. 4, both ends of the cooling pipe 51 are communicated to the cooling cavity 23, and the cooling liquid in the cooling cavity 23 can flow from one end of the cooling pipe 51 to the other end. During the flow of the cooling liquid through the cooling pipe 51, the outgoing terminal solder joint 321 can be cooled to reduce the temperature of the outgoing terminal solder joint 321.

[0051] In a possible implementation, the fixing block 52 and the busbar 4 can be integrated as a whole. The busbar 4 can include a conductor and an insulating layer wrapped outside the conductor, and the fixing block 52 and the insulating layer can be integrated as a whole plastic part.

[0052] The winding solder joint cooling member, the motor, and the vehicle driving system of the present application can obtain the following beneficial effects.

[0053] (1) The outgoing terminal solder joint 321 and the cooling pipe 51 are insulated from each other by the fixing block 52, so that the cooling pipe 51 can be arranged around the outgoing terminal solder joint 321, and the cooling liquid flowing through the cooling pipe 51 can cool the outgoing terminal solder joint 321.

[0054] (2) The outgoing terminal solder joint 321 is accommodated in the solder joint accommodating groove 521, which helps to reinforce the outgoing terminal solder joint 321 and reduce the risk of cracking of the outgoing terminal solder joint 321.

[0055] (3) The outgoing terminal solder joint 321 is exposed to the air through the heat dissipation hole 522, and air flow can be used to dissipate heat and cool the outgoing terminal solder joint 321.

[0056] The present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications to the above-mentioned embodiments of the present application under the teaching of the present application without departing from the scope of the present application. In addition, the following is explained.

[0057] (1) In the above embodiment, the solder point accommodating groove 521 is arc-shaped, and one solder point accommodating groove 521 can accommodate a plurality of line end solder points 321. However, the present application is not limited thereto, and in other possible embodiments, the solder point accommodating groove can be rectangular or other shapes, and each solder point accommodating groove can accommodate only one solder point.

[0058] (2) In the above embodiment, the line end solder points 321 are disposed in the solder point accommodating groove 521, but the present application is not limited thereto, and in at least one possible embodiment, the bus bar solder points can also be disposed in the solder point accommodating groove.

[0059] It should be understood that at least some aspects or characteristics of the above embodiments, examples or examples can be appropriately combined.

[0060] It can be understood that in the present application, when the number of components or members is not particularly limited, the number can be one or more, and here, multiple refers to two or more. For the case where the number of components or members is described as a specific number, such as two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not limiting, and it can be understood as multiple, i.e. two or more, but this does not mean that the present application excludes the case of one.

[0061] In the present application, unless otherwise explicitly stated or limited, the terms "mounting", "assembly", "assembly", "connection", "connection", "coupling", "connection", "abutment", "communication", "communication", "conduction", "fixing", "fastening" and the like should be understood broadly, for example, it can be direct or indirect. For example, in terms of connection, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication or interaction relationship between two elements, unless otherwise explicitly stated or limited. For example, in terms of communication / conduction, it can be direct communication / conduction, or indirect communication / conduction via an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the present application, unless otherwise explicitly stated or limited, a component is disposed in / installed in / located in / accommodated in / placed in another component, etc. can be either of the following two cases: a part or most of the one component is located within the other component; and the one component is completely accommodated in the other component.

[0063] Although the present application has been described in detail with reference to the above embodiments, it is apparent to those skilled in the art that the present application is not limited to the embodiments described in the specification. The present application can be modified and implemented in various ways without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the specification is intended to serve as an example for the purpose of illustration, and does not have any limiting meaning on the present application.

[0064] LIST OF REFERENCE NUMERALS 1 motor housing 11 cooling jacket mounting groove 12 axial hole 13 radial hole 14 plug 2 cooling jacket 21 flange 22 cooling pipe mounting hole 23 cooling cavity 3 stator 31 stator core 32 winding 321 outgoing line end welding point 4 bus bar 5 winding welding point cooling member 51 cooling pipe 52 fixing block 521 welding point accommodating groove 522 heat dissipation hole A axial direction R radial direction C circumferential direction

Claims

1. A winding joint cooling member, characterized by, The winding joint cooling piece can be mounted on a stator of an electric machine, and the winding joint cooling piece (5) comprises: a cooling pipe (51) which is a hollow pipe; and a fixing block (52) connected to the cooling pipe (51), the fixing block (52) is provided with joint accommodating grooves (521) in which outgoing joint points (321) of windings of the electric machine can be accommodated, the fixing block (52) is made of insulating material and is used to insulatively separate the outgoing joint points (321) and the cooling pipe (51), so that the cooling pipe (51) can be arranged around the outgoing joint points (321), and cooling liquid flowing through the cooling pipe (51) can cool the outgoing joint points (321).

2. The winding joint cooling member according to claim 1, characterized by, The joint accommodating grooves (521) are provided in two, and the two joint accommodating grooves (521) are respectively arranged on the inner and outer sides of the cooling pipe (51) in the radial direction (R) of the electric machine.

3. The winding joint cooling member according to claim 1, characterized by, The fixing block (52) is provided with heat dissipation holes (522) which are in communication with the joint accommodating grooves (521) and form openings at the axial ends of the fixing block (52).

4. The winding joint cooling member according to claim 1, characterized by, The cooling pipe (51) comprises a fixed portion inserted into the fixing block (52), and the fixed portion is parallel to the joint accommodating grooves (521).

5. The winding joint cooling member according to claim 1, characterized by, The cooling pipe (51) and the fixing block (52) are fixedly connected by injection molding.

6. An electric machine characterized by The winding joint cooling piece of any one of claims 1 to 5.

7. The electric machine of claim 6, wherein, The electric machine further comprises an electric machine housing (1) and a cooling jacket (2) mounted on the radially inner side of the electric machine housing (1), a cooling flow channel is formed between the cooling jacket (2) and the electric machine housing (1), and both ends of the cooling pipe (51) are in communication with the cooling flow channel.

8. The electric machine of claim 6, wherein, The electric machine comprises a stator which comprises a winding, and the winding (3) comprises wires, The outgoing joint points (321) are formed by welding two wires together, and the side walls of the joint accommodating grooves (521) clamp the two wires of the outgoing joint points (321) in the radial direction (R) of the electric machine.

9. The electric machine of claim 6, wherein, The cooling liquid accommodated in the cooling cavity (23) is water or an aqueous solution, and the electric machine is a water-cooled electric machine.

10. A vehicle drive system characterized by comprising: The winding joint cooling piece of any one of claims 1 to 5 or the electric machine of any one of claims 6 to 9.

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