High-voltage direct current contactor
By covering the outer surface of the high-voltage DC contactor with a heat-conducting shell and filling it with a heat-conducting medium, the problem of blocked heat conduction path at the high-voltage stationary contact lead-out end is solved, achieving efficient heat conduction and improving the operational reliability and electrical safety of the contactor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-03
AI Technical Summary
The heat conduction path of the high-voltage static contact lead of the high-voltage DC contactor is blocked, which leads to an increase in temperature and affects the reliability of operation. In addition, the fixed cross-sectional area of the copper busbar fails to dynamically match the current intensity, resulting in heat accumulation.
A heat-conducting shell is fitted on the outer surface of the high-voltage DC contactor, and a heat-conducting medium is filled between the heat-conducting shell and the body to form a sliding fit pair for heat conduction. The heat-conducting shell is designed with clearance notches and guide grooves to accommodate electrical connections. The heat-conducting medium uses heat-conducting gel to improve conduction efficiency.
It effectively reduces the temperature rise of the high-voltage static contact lead-out terminal, improves conduction efficiency, and ensures the electrical safety and reliability of the contactor.
Smart Images
Figure CN224082392U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat dissipation technology for high-voltage DC contactors, and in particular to a high-voltage DC contactor. Background Technology
[0002] In the electrical circuit of a car's power battery, the high-voltage DC contactor has the basic functions of carrying the working current and isolating the current and voltage. In the event of a vehicle failure, the high-voltage DC contactor plays a crucial role in cutting off the fault current and protecting personnel safety.
[0003] With the iterative upgrades in the charging and discharging capabilities of new energy vehicle power battery packs and the continuous increase in the power demands of high-voltage loads such as drive motors, the working load of high-voltage DC contactors has significantly increased, leading to a rise in the temperature of their high-voltage stationary contact leads. Excessive temperature can affect the operational reliability of high-voltage DC contactors. Furthermore, in practical applications, high-voltage DC contactors typically achieve external electrical connections via copper busbars or wiring harnesses. However, the cross-sectional area of copper busbars is often designed with fixed specifications, failing to dynamically match the current intensity. This results in the current carrying capacity per unit cross-sectional area exceeding the safety threshold. Moreover, due to the highly integrated layout of battery packs, the arrangement of high-voltage DC contactors is very compact, obstructing the heat conduction path at the high-voltage stationary contact leads, further increasing their temperature. Utility Model Content
[0004] Based on this, the purpose of this utility model is to provide a high-voltage DC contactor, which aims to solve the problem of blocked heat conduction path at the high-voltage static contact lead-out end of the existing high-voltage DC contactor.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A high-voltage DC contactor includes a body and a heat-conducting shell. The top wall of the body is provided with a high-voltage static contact lead-out end, and the side wall of the body is provided with a low-voltage connector interface. The bottom wall of the body forms an assembly plane with mounting and positioning holes. The heat-conducting shell is sleeved on the outer surface of the body and exposes at least the high-voltage static contact lead-out end and the low-voltage connector interface. The bottom opening of the heat-conducting shell is provided and does not exceed the assembly plane. A gap is provided between the heat-conducting shell and the top wall of the body to fill the heat-conducting medium.
[0006] In addition, the high-voltage DC contactor according to the present invention may also have the following additional technical features:
[0007] Furthermore, the heat-conducting shell and the body form a sliding fit pair.
[0008] Furthermore, the sliding fit pair includes a guide groove and a guide block that cooperate with each other. The guide groove is disposed on the side wall of the body, and the guide block is disposed on the heat-conducting shell.
[0009] Furthermore, the heat-conducting shell has a first clearance notch in the side wall region adjacent to the low-pressure connector interface.
[0010] Furthermore, the height of the guide block is greater than the depth of the guide groove, and a heat-conducting medium is filled between the heat-conducting shell and the side wall of the body.
[0011] Furthermore, the length of the heat-conducting shell is less than the length of the body, and the guide block is disposed at both sides of the first clearance notch.
[0012] Furthermore, the depth of the first clearance notch is less than the height of the heat-conducting shell in the sidewall region adjacent to the low-pressure connector interface.
[0013] Furthermore, the heat-conducting shell has a second clearance notch in the side wall area opposite to the low-pressure connector interface.
[0014] Furthermore, the thermally conductive medium comprises a thermally conductive gel.
[0015] Furthermore, the heat-conducting shell is an electrically insulating structure.
[0016] The beneficial effects of this utility model include at least the following: by attaching a heat-conducting shell to the outer surface of the high-voltage DC contactor body and forming a gap between the top of the high-voltage DC contactor body and the heat-conducting shell, and filling the gap with a heat-conducting medium, the heat generated at the high-voltage stationary contact lead-out end can be quickly conducted to the heat-conducting shell, and the heat-conducting shell can then quickly conduct the heat out, thereby achieving the purpose of significantly reducing the temperature rise at the high-voltage stationary contact lead-out end. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a high-voltage DC contactor in one embodiment of the present invention;
[0018] Figure 2 This is a schematic diagram of the structure of the heat-conducting shell in one embodiment of the present invention;
[0019] Figure 3 This is an assembly diagram of the high-voltage DC contactor and the heat-conducting shell from a first-view perspective in one embodiment of the present invention.
[0020] Figure 4 A second-view assembly diagram of the high-voltage DC contactor and the heat-conducting shell in one embodiment of this utility model;
[0021] Figure 5This is a cross-sectional view of the high-voltage DC contactor and the heat-conducting shell after assembly according to an embodiment of the present invention;
[0022] Explanation of key component symbols:
[0023] Body 100, high-voltage static contact lead-out end 110, assembly plane 140, guide groove 150, heat-conducting shell 200, guide block 210, first clearance notch 220, second clearance notch 230;
[0024] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation
[0025] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.
[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0028] Please refer to Figures 1 to 5This invention provides a high-voltage DC contactor, comprising a body 100 and a heat-conducting shell 200. The top wall of the body 100 has two sets of separated high-voltage stationary contact leads 110, which are used to control the connection and disconnection of the main circuit. The side wall of the body 100 has a set of low-voltage connector interfaces (not shown in the drawings), which are used to connect the control circuit. The bottom wall of the body 100 forms an assembly plane 140 with mounting positioning holes (not shown in the drawings). During assembly, the body 100 is mounted on a metal housing on the vehicle body through the mounting positioning holes. The metal housing provides rapid heat dissipation. The heat-conducting shell 200 is fitted onto the outer surface of the body 100. To avoid affecting the electrical wiring connection, the area of the heat-conducting shell 200 does not cover the high-voltage stationary contact leads 110 and the low-voltage connector interfaces. The bottom of the heat-conducting shell 200 has an opening, and the bottom of the heat-conducting shell 200 does not exceed the assembly plane 140 to avoid interfering with the assembly of the body 100. Optionally, the bottom of the heat-conducting shell 200 can be flush with the mounting plane 140. This allows the bottom wall of the body 100 to not only form the mounting plane 140, but also provides a large heat dissipation area for both the bottom wall of the body 100 and the heat-conducting shell 200, enabling rapid heat dissipation from the high-voltage stationary contact lead-out terminal 110. Alternatively, the bottom of the heat-conducting shell 200 can be spaced apart from the mounting plane 140. This also allows the bottom wall of the body 100 to form the mounting plane 140 and provides a large heat dissipation area, facilitating rapid heat dissipation from the high-voltage stationary contact lead-out terminal 110. A gap is provided between the heat-conducting shell 200 and the top wall of the body 100 to be filled with a heat-conducting medium. The heat generated by the high-voltage stationary contact lead-out terminal 110 during operation is conducted to the heat-conducting shell 200 through the heat-conducting medium, and then rapidly dissipated through the heat-conducting shell 200.
[0029] To facilitate the assembly of the heat-conducting shell 200 with the body 100, in some optional embodiments, the heat-conducting shell 200 and the body 100 form a sliding fit pair. Precise positioning is achieved through the sliding fit pair, allowing the heat-conducting shell 200 and the body 100 to be quickly fitted together.
[0030] In some alternative embodiments, such as Figure 1 , Figure 2 As shown, the sliding fit pair includes a guide groove 150 and a guide block 210 that cooperate with each other. The guide groove 150 is disposed on the side wall of the body 100, and the guide block 210 is disposed on the heat-conducting shell 200. For example, the body 100 is rectangular, and the high-voltage static contact lead-out end 110 and the low-voltage connector interface are respectively disposed on the top outer wall and the right outer wall of the body 100. Two sets of parallel guide grooves 150 are disposed on the front and rear outer walls of the body 100, and guide blocks 210 corresponding to the positions of the guide grooves 150 are disposed on the front and rear inner walls of the heat-conducting shell 200.
[0031] During the assembly of the heat-conducting shell 200 and the body 100, in order to prevent positional interference between the heat-conducting shell 200 and the low-voltage connector interface, in some optional embodiments, such as... Figure 1 As shown, the heat-conducting shell 200 has a first clearance notch 220 in the side wall area adjacent to the low-voltage connector interface. When the guide block 210 on the heat-conducting shell 200 is inserted into the guide groove 150 from top to bottom, the heat-conducting shell 200, which is gradually descending, will not be blocked by the low-voltage connector interface due to the presence of the first clearance notch 220. Moreover, the first clearance notch 220 is also conducive to the heat dissipation of the body 100 and also facilitates the filling of heat dissipation medium.
[0032] In some alternative embodiments, such as Figure 4 As shown, the height of the guide block 210 is greater than the depth of the guide groove 150. When the guide block 210 on the heat-conducting shell 200 is inserted into the guide groove 150, a gap S1 is formed between the heat-conducting shell 200 and the side wall of the body 100. By filling the gap S1 with a heat-conducting medium, the heat generated by the high-voltage static contact lead-out end 110 during operation and the heat on the side wall of the body 100 can be conducted to the heat-conducting shell 200. For example, the body 100 is rectangular. The high-voltage static contact lead-out end 110 and the low-voltage connector interface are respectively set on the top outer wall and the right outer wall of the body 100. Two sets of parallel guide grooves 150 are provided on the front and rear outer walls of the body 100. Guide blocks 210 corresponding to the positions of the guide grooves 150 are provided on the front and rear inner walls of the heat-conducting shell 200. At this time, a gap S1 is formed between the front and rear inner walls of the heat-conducting shell 200 and the front and rear outer walls of the body 100. The gap S1 is filled with a heat dissipation medium.
[0033] In some alternative embodiments, such as Figure 3 As shown, the length of the heat-conducting shell 200 is less than the length of the body 100. The guide block 210 is located at the two sides of the first clearance notch 220. While saving materials, the heat-conducting shell 200 can cover most of the body 100 as much as possible.
[0034] In some alternative embodiments, such as Figure 2 As shown, the depth of the first clearance notch 220 is less than the height of the heat-conducting shell 200 in the side wall area adjacent to the low-voltage connector interface. When the heat-conducting shell 200 is sleeved with the body 100, the bottom of the first clearance notch 220 blocks the gap S2 between the heat-conducting shell 200 and the top wall of the body 100. By filling the gap S2 with a heat-conducting medium, the heat generated by the high-voltage static contact lead-out terminal 110 during operation can be transferred to the heat-conducting shell 200 in a timely manner.
[0035] In some alternative embodiments, such as Figure 2As shown, the heat-conducting shell 200 has a second clearance notch 230 in the side wall area opposite to the low-voltage connector interface. By setting the second clearance notch 230, the material used in the heat-conducting shell 200 can be saved, and it is also convenient to fill the heat dissipation medium.
[0036] In some optional embodiments, the thermally conductive medium includes a thermally conductive gel, which has properties such as high thermal conductivity, low thermal resistance, and low stress. It can not only provide good conduction but also fix the thermally conductive shell 200 and the body 100.
[0037] In some alternative embodiments, the heat-conducting shell 200 is an electrically insulating structure, thereby improving the electrical safety of the heat-conducting shell 200.
[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0039] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the appended claims.
Claims
1. A high-voltage DC contactor, characterized in that, The high-voltage DC contactor includes: The main body has a high-voltage static contact lead-out end on its top wall, a low-voltage connector interface on its side wall, and an assembly plane with mounting and positioning holes on its bottom wall. A heat-conducting shell is fitted onto the outer surface of the body, exposing at least the high-voltage static contact lead-out end and the low-voltage connector interface. The bottom opening of the heat-conducting shell is provided and does not exceed the mounting plane. A gap is provided between the heat-conducting shell and the top wall of the body to fill the heat-conducting medium.
2. The high-voltage DC contactor according to claim 1, characterized in that, The heat-conducting shell and the body form a sliding fit pair.
3. The high-voltage DC contactor according to claim 2, characterized in that, The sliding fit pair includes a guide groove and a guide block that cooperate with each other, and the guide groove is provided on the side wall of the body.
4. The high-voltage DC contactor according to claim 3, characterized in that, The heat-conducting shell has a first clearance notch in the side wall area adjacent to the low-pressure connector interface.
5. The high-voltage DC contactor according to claim 4, characterized in that, The height of the guide block is greater than the depth of the guide groove, and the space between the heat-conducting shell and the side wall of the body is filled with a heat-conducting medium.
6. The high-voltage DC contactor according to claim 4, characterized in that, The length of the heat-conducting shell is less than the length of the body, and the guide block is disposed on both sides of the first clearance notch.
7. The high-voltage DC contactor according to claim 6, characterized in that, The depth of the first clearance notch is less than the height of the heat-conducting shell in the sidewall region adjacent to the low-pressure connector interface.
8. The high-voltage DC contactor according to claim 6, characterized in that, The heat-conducting shell has a second clearance notch in the side wall area opposite to the low-pressure connector interface.
9. The high-voltage DC contactor according to claim 1 or 5, characterized in that, Thermally conductive media include thermally conductive gels.
10. The high-voltage DC contactor according to any one of claims 1 to 8, characterized in that, The heat-conducting shell is an electrically insulating structure.