A copper bar disconnect device, motor system, and vehicle

Abstract

The utility model provides a kind of copper bar disconnecting device, motor system and vehicle, belong to short-circuit protection field.The copper bar disconnecting device includes: copper bar, hydraulic impact device;The copper bar middle part has stress concentration area;When short circuit occurs in external circuit, the hydraulic impact device can hit the stress concentration area, to make the copper bar disconnect from the stress concentration area place.The utility model makes copper bar disconnect by the mechanical structure impact of hydraulic impact device on stress concentration area on copper bar, to effectively avoid large current damage copper bar rear-end equipment under short circuit, improve equipment safety.

Description

Technical Field

[0001] This utility model belongs to the field of short circuit protection, specifically relating to a copper busbar disconnection device, a motor system, and a vehicle. Background Technology

[0002] If a short circuit occurs in the silicon carbide metal-oxide-semiconductor (SiC MOS) in the power module of the motor controller during the operation of a new energy electric vehicle, the following four situations may occur.

[0003] 1. Equipment damage. SiC MOS may generate huge short-circuit current under short-circuit conditions, causing the internal temperature of the equipment to rise, thereby damaging the internal structure of the equipment, such as the gate oxide layer.

[0004] II. System Protection Failure. Tram systems typically have protection mechanisms to prevent further damage from overcurrent and short circuits. However, while the high-speed switching characteristics and high-temperature performance of SiC MOS help reduce the impact of short circuits, if the short-circuit current is too large, the protection mechanism may not respond quickly enough, leading to system protection failure.

[0005] Third, performance degradation. The performance of SiC MOSFETs may be affected under short-circuit conditions, causing them to malfunction and thus affecting the running performance and safety of the tram.

[0006] IV. Safety Hazards. Because SiC MOS can generate significant heat during a short circuit, improperly designed cooling systems may pose safety hazards such as fires.

[0007] When a short circuit occurs in a SiC MOS, existing methods use a digital signal processor (DSP) to issue a command to activate the actuator and infer the inverter output terminal to prevent a short circuit in the motor windings. Specifically, a fuse is used to control the device to break the copper busbar without generating an electric arc, but the continuous conduction of large current can cause accidents such as fires.

[0008] Therefore, how to effectively protect motors and other related equipment and improve vehicle safety when a SiC MOS short circuit occurs has become an urgent problem to be solved. Utility Model Content

[0009] The purpose of this invention is to solve the problems existing in the prior art and provide a copper busbar disconnection device, a motor system and a vehicle, which can prevent the large current under short circuit from damaging the equipment at the back end of the copper busbar and improve equipment safety.

[0010] This utility model is achieved through the following technical solution:

[0011] The first aspect of this utility model provides a copper busbar disconnection device, the copper busbar disconnection device comprising:

[0012] 1. Copper busbar; 2. Hydraulic impact device;

[0013] The copper busbar 1 has a stress concentration region 11 in the middle;

[0014] When a short circuit occurs in the external circuit, the hydraulic impact device 2 can strike the stress concentration area 11, causing the copper busbar 1 to disconnect from the stress concentration area 11.

[0015] The further improvement of this utility model is as follows:

[0016] The hydraulic impact device 2 includes a hydraulic unit 21, a hydraulic actuator 22, and an impactor 23. The hydraulic unit 21 is connected to the hydraulic actuator 22, and the impactor 23 is disposed on the hydraulic actuator 22. When the liquid pressure output by the hydraulic unit 21 is greater than a preset pressure threshold, the hydraulic actuator 22 pushes the impactor 23 away from the hydraulic actuator 22 through the liquid pressure and impacts it in the direction of the stress concentration area 11.

[0017] The further improvement of this utility model is as follows:

[0018] The hydraulic actuator 22 is disposed on the output oil passage 211 of the hydraulic unit 21, the impact member 23 is a steel ball 231, and the hydraulic actuator 22 includes a ball seat assembly 221.

[0019] The further improvement of this utility model is as follows:

[0020] The hydraulic actuator 22 also includes a guide tube, the axis of which is the impact direction of the impact member 23. One end of the guide tube is located at the body of the hydraulic actuator 22, and the other end faces the stress concentration area 11.

[0021] The further improvement of this utility model is as follows:

[0022] The hydraulic actuator 22 also includes a retaining ring and / or an elastic connector;

[0023] One end of the elastic connector is connected to the steel ball 231, and the other end is connected to the interior of the output oil passage 211;

[0024] The diameter of the retaining ring is smaller than the diameter of the steel ball 231, and the retaining ring is connected to the ball seat assembly 221;

[0025] Before the steel ball 231 is disengaged from the hydraulic actuator 22, the retaining ring and / or the elastic connector limit the position of the steel ball 231.

[0026] The further improvement of this utility model is as follows:

[0027] The hydraulic unit 21 includes a hydraulic motor 214, a gear set 215, and a gear pump 216. The hydraulic motor 214 drives the gear pump 216 through the gear set 215. The outlet of the gear pump 216 is connected to the hydraulic actuator 22.

[0028] The further improvement of this utility model is as follows:

[0029] The hydraulic unit 21 includes an electronic pump 217, the outlet of which is connected to the hydraulic actuator 22.

[0030] The further improvement of this utility model is as follows:

[0031] The stress concentration region 11 has a hollow structure 11a.

[0032] The second aspect of this utility model provides a motor system, the motor system including the copper busbar disconnect device, the motor body and the motor controller as described in the first aspect, the motor controller being connected to the motor body through the copper busbar disconnect device.

[0033] The third aspect of this utility model provides a vehicle, which includes the motor system described in the second aspect.

[0034] Compared with existing technologies, the advantages of this invention are: This invention uses a hydraulic impact device to mechanically strike the stress concentration area on the copper busbar, causing it to break. This effectively avoids damage to downstream equipment from high currents during short circuits, thus improving equipment safety. When applied to new energy vehicles, it can effectively prevent fires and other safety accidents caused by high current accumulation in the electronic control system, improving the safety of both the motor and the vehicle. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the copper busbar disconnection device in one embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram showing the position of the steel ball in the oil passage in one embodiment of this utility model;

[0037] Figure 3 This is a schematic diagram of the hydraulic impact device in one embodiment of the present invention;

[0038] Figure 4This is a schematic diagram of the hydraulic impact device in another embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the copper busbar structure in one embodiment of the present invention.

[0040] The reference numerals in the attached figures are explained as follows:

[0041] 1-Copper busbar, 11-Stress concentration area, 11a-Hollowed-out structure;

[0042] 2-Hydraulic impact device, 21-Hydraulic unit, 22-Hydraulic actuator, 23-Impacting component, 211-Output oil passage, 211a-Opening, 211-Output oil passage, 212-Input oil passage, 213-Housing, 214-Hydraulic motor, 215-Gear set, 216-Gear pump, 217-Electronic pump, 221-Ball seat assembly, 231-Steel ball. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings:

[0044] Figure 1 This is a schematic diagram of the copper busbar disconnection device in one embodiment of the present invention, as shown below. Figure 1 As shown, a copper busbar disconnection device according to an embodiment of the present invention includes: a copper busbar 1 and a hydraulic impact device 2.

[0045] The copper busbar 1 has good electrical conductivity and a certain mechanical strength, and can be used in electrical connection parts to conduct current. The copper busbar 1 has a stress concentration area 11 in the middle, and the hydraulic impact device 2 strikes the stress concentration area 11.

[0046] When a short circuit occurs in the external circuit, the hydraulic impact device 2 can strike the stress concentration area 11, causing the copper busbar 1 to disconnect from the stress concentration area 11 and sever the electrical connection between the equipment on both sides of the copper busbar 1.

[0047] In this invention, the copper busbar disconnection device can be applied to fixed installation scenarios involving high current transmission, such as in new energy vehicles.

[0048] This invention utilizes the mechanical structure of the hydraulic impact device 2 to impact the stress concentration area 11 on the copper busbar 1, thereby disconnecting the copper busbar 1 and preventing damage to downstream equipment from the large current under short circuit conditions, thus improving equipment safety. When applied to the busbar of the motor controller in new energy vehicles, timely disconnection of the copper busbar on the motor controller used to connect to the motor at the moment of short circuit in the power module semiconductor can effectively prevent safety accidents such as fires caused by the accumulation of large current in the electronic control system, improving the safety of the motor and the vehicle.

[0049] Please continue reading. Figure 1In one embodiment, the hydraulic impact device 2 includes a hydraulic unit 21, a hydraulic actuator 22, and an impact member 23. The hydraulic unit 21 is connected to the hydraulic actuator 22, and the impact member 23 is disposed on the hydraulic actuator 22. When the liquid pressure output by the hydraulic unit 21 exceeds a preset pressure threshold, the hydraulic actuator 22 uses the liquid pressure to push the impact member 23 away from the hydraulic actuator 22 and impact it towards the stress concentration area 11. Figure 1 The direction indicated by the middle arrow.

[0050] Specifically, the impactor can be a sphere, a cone, or other similar structure, but is not limited to these. The impactor can be made of metallic materials; preferably, it is made of steel, which effectively saves manufacturing costs while ensuring hardness.

[0051] In the following embodiments, the impact component is a steel ball, which is used as an example to illustrate the copper busbar disconnection device in the embodiments.

[0052] In one embodiment, the hydraulic actuator 22 is disposed on the output oil passage 211 of the hydraulic unit 21.

[0053] Figure 2 This is a schematic diagram showing the position of the hydraulic actuator in the oil passage in one embodiment of this utility model, as shown below. Figure 2 As shown, the hydraulic unit includes an output oil passage 211, which provides a transmission path for the hydraulic oil output by the hydraulic unit. The output oil passage 211 has an opening 211a. The hydraulic actuator includes a ball seat assembly 221, which has a cavity. The ball seat assembly 221 is positioned at the opening 221 and is fixedly connected to the opening 211a, thereby communicating with the output oil passage 211. The dashed arrow in the figure indicates the direction of hydraulic oil flow.

[0054] Specifically, the lower part of the ball seat assembly 221 is cylindrical and the upper part is conical, with cavities of the same shape inside. The entire cavity is connected to the output oil passage 211. At the end of the ball seat assembly 221 away from the output oil passage 211, there is a sealing ring (not shown in the figure) that matches the curvature of the steel ball 231. The steel ball 231 is disposed in the ball seat assembly 221, so that the steel ball 231 and the ball seat assembly 221 cooperate to form a sealing structure.

[0055] To ensure that the steel ball seals the opening when the hydraulic unit's output fluid pressure is less than or equal to a preset pressure threshold, in one embodiment, the hydraulic actuator includes an elastic connector. One end of the elastic connector is connected to the steel ball, and the other end is connected to the interior of the output oil passage 211. Before the steel ball detaches from the hydraulic actuator, the elastic connector limits its movement.

[0056] Specifically, the elastic connector can be a spring. The steel ball can be restrained at the opening 211a of the hydraulic actuator by a spring, that is, one end of the spring is connected to the steel ball, and the other end is connected to the wall of the oil passage at the opening 211a. Understandably, the strength of the spring is less than the impact strength of the high-speed oil, so that under the impact force of the high-speed oil, the tension acting on the spring during the movement of the steel ball can break the spring.

[0057] In one embodiment, the hydraulic actuator 22 further includes a guide tube, the axis of which is in the direction of impact of the impactor (23). Specifically, one end of the guide tube can be located at the body of the hydraulic actuator 22, and the other end faces the stress concentration area 11.

[0058] For example, a guide tube is provided between the opening of the output oil passage and the copper busbar, and the ball seat assembly 221 is provided inside the guide tube. The guide tube provides an impact channel for the steel ball, thereby preventing the steel ball from hitting other places.

[0059] In one embodiment, the hydraulic actuator 22 may further include a retaining ring, the diameter of which is smaller than the diameter of the steel ball 231. The retaining ring limits the movement of the steel ball 231 before it leaves the hydraulic actuator 22.

[0060] To prevent the steel ball from moving, a retaining ring can be installed in the direction of impact. This retaining ring can be connected to the ball seat assembly; when a guide tube is provided, the retaining ring can also be connected to the guide tube. Thus, the steel ball is confined to a fixed area through the retaining ring and the opening in the oil passage. It is important to note that the strength of the retaining ring must be less than the high-speed impact force of the hydraulic oil to ensure that the high-speed oil can break through the retaining ring, thereby ensuring that the steel ball can smoothly impact the stress concentration area of ​​the copper busbar.

[0061] Figure 3 This is a schematic diagram of the hydraulic impact device in one embodiment of the present invention, as shown below. Figure 3 As shown, in this embodiment, the hydraulic impact device includes a hydraulic unit, a ball seat assembly 221, and a steel ball 231. The hydraulic unit includes an output oil passage 211, an input oil passage 212, a housing 213, a hydraulic motor 214, a gear set 215, and a gear pump 216. The ball seat assembly 221 is disposed at the opening of the output oil passage 211, and the steel ball 231 is disposed within the ball seat assembly 221.

[0062] In this embodiment, the hydraulic motor 214 serves as a power source, converting electrical energy into mechanical energy to output rotational power. The gear set 215 transmits the power from the hydraulic motor 214, changing its speed and torque to achieve efficient power distribution and transmission. The gear pump 216 operates under the drive of the gear set 215, using the meshing and disengagement of gears to draw in and discharge hydraulic fluid. The housing 213 serves as the external structure of the hydraulic unit, housing and protecting the internal components and providing a mounting base for them.

[0063] Specifically, gear set 215 is mounted on one end of the drive shaft, and is connected to hydraulic motor 214 via a coupling. Hydraulic motor 214 transmits power to the drive shaft through gear set 215. The other end of the drive shaft is connected to gear pump 216 via a spline. The outlet of gear pump 216 is connected to output oil passage 211. Hydraulic motor 214 drives gear pump 216 through gear set 215, and the operation of gear pump 216 enables the flow of oil in the oil passage.

[0064] When the copper busbar disconnect device is used for short-circuit protection of the power module between the motor controller and the motor body, part of the hydraulic unit can be integrated into the motor controller housing, and another part can be integrated into the motor housing. Specifically, the gear pump 216 and the output oil passage 211 are integrated into the motor controller housing, and the drive shaft and gear set 215 are integrated into the motor housing. A cover plate is provided on the gear pump 216, and the cover plate is fixedly connected to the motor controller housing to confine the gear pump 216 within the motor controller housing. Alternatively, a separate housing can be provided to accommodate the drive shaft and gear set 215.

[0065] The working process is as follows: When the power device is short-circuited, the vehicle receives a signal and immediately sends a command to the hydraulic motor 214. By applying a larger motor speed, the driving force of the gear pump 215 is provided, thereby outputting fluid kinetic energy in the oil passage. At this time, the gear pump 216 outputs oil with a larger flow rate and pressure into the output oil passage 211, pushing the steel ball out of the ball seat assembly 221. Due to the high instantaneous velocity of the oil, the impact force on the steel ball is also high. Since the thickness of a stress concentration area on the copper busbar is low, the copper busbar can be broken, disconnecting the connection between the electronic control and the motor.

[0066] Next, combined Figure 4 This invention describes a hydraulic impact device according to another embodiment of the present invention. In this embodiment, the hydraulic actuator is a ball seat assembly disposed on the output oil passage.

[0067] Figure 4 This is a schematic diagram of the hydraulic impact device structure in another embodiment of the present invention, as shown below. Figure 4As shown, the hydraulic impact device includes a hydraulic unit, a ball seat assembly 221, and a steel ball 231. The hydraulic unit includes an output oil passage 211, an input oil passage 212, a housing 213, and an electric pump 217. The outlet of the electric pump 217 is connected to the ball seat assembly 221 via the output oil passage 211. The ball seat assembly 221 is mounted on the output oil passage 211, and the steel ball 231 is housed within the ball seat assembly 221.

[0068] Figure 4 The hydraulic impact device shown can be applied to new energy vehicles. When the power device is short-circuited, the vehicle will receive a signal and immediately send a command to the electronic pump to run the electronic pump, causing the pressure in the oil passage to rise sharply. The high-speed flow of hydraulic oil will create an impact force on the steel ball. This mechanical impact force will break the stress concentration area on the copper busbar, disconnect the connection between the electronic control and the motor, thereby protecting the motor and the entire vehicle.

[0069] In one embodiment, the stress concentration area has a hollow structure.

[0070] Figure 5 This is a schematic diagram of the copper busbar structure in one embodiment of the present invention, as shown below. Figure 5 As shown, the hollow structure 11a creates a thinner region on the copper busbar 1. Due to its thinness, this region has lower strength, forming a stress concentration area. For example, the hollow structure 11a can be arc-shaped, zigzag-shaped, etc.

[0071] This utility model also provides a motor system. In one embodiment, the motor system includes a copper busbar disconnect device, a motor body, and a motor controller, as described in any of the above embodiments. The motor controller is connected to the motor body via the copper busbar disconnect device.

[0072] When a short circuit occurs in the power module, disconnecting the power module from the motor controller can effectively prevent excessive short-circuit current from damaging related components and equipment of the motor controller, thus ensuring vehicle safety.

[0073] This utility model also provides a vehicle, which includes the motor system described in the above embodiments.

[0074] In one embodiment, the vehicle is a vehicle equipped with an electric drive system (EDS) or a vehicle equipped with a hybrid system.

[0075] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0076] In the description of this utility model, unless otherwise stated, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0077] Finally, it should be noted that the above technical solution is only one implementation of this utility model. For those skilled in the art, based on the principles disclosed in this utility model, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the above specific embodiments of this utility model. Therefore, the above description is only preferred and has no limiting significance.

Claims

1. A copper busbar disconnection device, characterized in that: The copper busbar disconnection device includes: a copper busbar (1) and a hydraulic impact device (2); The copper busbar (1) has a stress concentration area (11) in the middle; When a short circuit occurs in the external circuit, the hydraulic impact device (2) can strike the stress concentration area (11) to cause the copper busbar (1) to disconnect from the stress concentration area (11).

2. The copper busbar disconnection device according to claim 1, characterized in that: The hydraulic impact device (2) includes a hydraulic unit (21), a hydraulic actuator (22), and an impactor (23). The hydraulic unit (21) is connected to the hydraulic actuator (22), and the impactor (23) is disposed on the hydraulic actuator (22). When the liquid pressure output by the hydraulic unit (21) is greater than the preset pressure threshold, the hydraulic actuator (22) pushes the impactor (23) away from the hydraulic actuator (22) by the liquid pressure and impacts it in the direction of the stress concentration area (11).

3. The copper busbar disconnection device according to claim 2, characterized in that: The hydraulic actuator (22) is disposed on the output oil passage (211) of the hydraulic unit (21), the impact member (23) is a steel ball (231), and the hydraulic actuator (22) includes a ball seat assembly (221).

4. The copper busbar disconnection device according to claim 2 or 3, characterized in that: The hydraulic actuator (22) also includes a guide tube, the axis of which is the impact direction of the impacting member (23). One end of the guide tube is located at the body of the hydraulic actuator (22), and the other end faces the stress concentration area (11).

5. The copper busbar disconnection device according to claim 3, characterized in that: The hydraulic actuator (22) also includes a retaining ring and / or a resilient connector; One end of the elastic connector is connected to the steel ball (231), and the other end is connected to the interior of the output oil passage (211); The diameter of the retaining ring is smaller than the diameter of the steel ball (231), and the retaining ring is connected to the ball seat assembly (221); Before the steel ball (231) is disengaged from the hydraulic actuator (22), the retaining ring and / or the elastic connector limit the position of the steel ball (231).

6. The copper busbar disconnection device according to claim 2, characterized in that: The hydraulic unit (21) includes a hydraulic motor (214), a gear set (215) and a gear pump (216). The hydraulic motor (214) drives the gear pump (216) through the gear set (215). The outlet of the gear pump (216) is connected to the hydraulic actuator (22).

7. The copper busbar disconnection device according to claim 2, characterized in that: The hydraulic unit (21) includes an electronic pump (217), the outlet of which is connected to the hydraulic actuator (22).

8. The copper busbar disconnection device according to claim 1, characterized in that: The stress concentration area (11) has a hollow structure (11a).

9. A motor system, characterized in that: The motor system includes a copper busbar disconnect device, a motor body, and a motor controller as described in any one of claims 1 to 8, wherein the motor controller is connected to the motor body via the copper busbar disconnect device.

10. A vehicle, characterized in that: The vehicle includes the motor system of claim 9.

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