High voltage dc contactor

Abstract

This invention provides a high-voltage DC contactor, relating to the technical field of contactor equipment. The high-voltage DC contactor includes a housing, a drive assembly, and coil terminals. The drive assembly is disposed inside the housing, and the drive coil of the drive assembly is soldered to one end of the coil terminals. A terminal insertion slot is provided on the housing, and the other end of the coil terminals is disposed within the terminal insertion slot, allowing the wiring plug of the BMS circuit board to be inserted into the terminal insertion slot. This achieves the technical effect of facilitating connection of the contactor to the BMS.

Description

Technical Field

[0001] This invention relates to the field of contactor equipment technology, and more specifically, to high-voltage DC contactors. Background Technology

[0002] High-voltage contactors are electromechanical high-voltage switching components. They are driven by an electromagnetic actuator to engage / disengage moving and stationary contacts, and rely on ceramic sealing to achieve physical isolation between high and low voltage chambers. They can frequently carry rated current and short-term fault current in high-voltage DC environments ranging from hundreds of volts to thousands of volts. They are widely used in high-voltage power distribution circuits of new energy vehicles and energy storage power stations to realize the functions of main circuit power-on, power-off, and emergency fault disconnection.

[0003] However, in the high-voltage power distribution system of new energy vehicles, the drive coil contact terminals of traditional high-voltage DC contactors need to be connected to the BMS circuit board by welding nickel sheets, etc., in order to control the on and off of the high-voltage DC contactor. However, the connection is completed by welding in the existing technology, which has low assembly efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage DC contactor to alleviate the technical problem of low efficiency in connecting contactors to a BMS in the prior art.

[0005] In a first aspect, embodiments of the present invention provide a high-voltage DC contactor, including a housing, a drive assembly, and coil terminals; The drive assembly is disposed inside the housing. The drive coil of the drive assembly is soldered to one end of the coil terminal. A terminal insertion slot is provided on the housing. The other end of the coil terminal is disposed in the terminal insertion slot so that the wiring plug of the BMS circuit board is inserted into the terminal insertion slot.

[0006] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the coil terminal is provided with a buckle for fixing the cable at the end connected to the drive coil.

[0007] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the drive coil and the latch are welded together by resistance welding.

[0008] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the drive assembly includes an outer iron core bushing assembly, a frame assembly, a drive coil, a moving iron core, and a drive shaft; The skeleton assembly is disposed on the outer iron core bushing assembly, the drive coil is wound on the skeleton assembly, the moving iron core is slidably disposed in the drive coil, there is an annular space between the moving iron core and the drive coil, and the drive shaft is inserted into the moving iron core; The top of the skeleton assembly is provided with a support base for supporting the coil terminal, and a portion of the coil terminal is embedded in the support base.

[0009] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the drive shaft and the moving iron core are welded together.

[0010] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein a positioning pin is provided on the bottom shell of the aforementioned outer shell, and a positioning hole for fitting the positioning pin is provided on the outer iron core bushing assembly.

[0011] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein a guide groove is provided on the inner wall of the terminal plug groove.

[0012] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the inner wall of the terminal insertion groove is provided with guide ribs.

[0013] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the side wall of the terminal plug slot is provided with a snap-fit ​​interface for engaging with the wiring plug.

[0014] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the bottom of the aforementioned housing is provided with a connecting base for connecting to the BUD base.

[0015] Beneficial effects: This invention provides a high-voltage DC contactor, including a housing, a drive assembly, and coil terminals. The drive assembly is disposed inside the housing, and the drive coil of the drive assembly is welded to one end of the coil terminals. A terminal insertion slot is provided on the housing, and the other end of the coil terminals is disposed in the terminal insertion slot so that the wiring plug of the BMS circuit board is inserted into the terminal insertion slot.

[0016] Specifically, one end of the coil terminal can be connected to the drive coil of the drive assembly, and the other end is led out to the terminal insertion slot on the outer wall of the housing, so that the wiring plug of the BMS circuit board can be directly inserted into the terminal insertion slot, thereby realizing the connection between the BMS circuit board and the coil terminal. The terminal insertion slot facilitates the connection between the coil terminal and the BMS circuit board. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a high-voltage DC contactor provided in an embodiment of the present invention; Figure 2 This is an internal schematic diagram of a high-voltage DC contactor provided in an embodiment of the present invention; Figure 3 A schematic diagram of the drive assembly and coil terminals in a high-voltage DC contactor provided in an embodiment of the present invention; Figure 4 A schematic diagram of the bottom shell of a high-voltage DC contactor provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the outer iron core bushing assembly in a high-voltage DC contactor provided in an embodiment of the present invention.

[0019] icon: 100 - Outer shell; 110 - Terminal insertion slot; 111 - Guide groove; 112 - Guide rib; 113 - Snap-in interface; 120 - Bottom shell; 130 - Positioning pin; 140 - Connecting base; 200-Drive assembly; 210-Outer iron core bushing assembly; 211-Positioning hole; 220-Frame assembly; 221-Support base; 230-Drive coil; 240-Moving iron core; 250-Drive shaft; 300 - Coil terminal block; 310 - Snap fastener. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0025] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this embodiment provides a high-voltage DC contactor, including a housing 100, a drive assembly 200, and a coil terminal block 300. The drive assembly 200 is disposed inside the housing 100, and the drive coil 230 of the drive assembly 200 is soldered to one end of the coil terminal block 300. A terminal insertion slot 110 is provided on the housing 100, and the other end of the coil terminal block 300 is disposed in the terminal insertion slot 110 so that the wiring plug of the BMS circuit board is inserted into the terminal insertion slot 110.

[0026] Specifically, one end of the coil terminal 300 can be connected to the drive coil 230 of the drive assembly 200, and the other end is led out to the terminal insertion slot 110 on the outer wall of the housing 100, so that the wiring plug of the BMS circuit board can be directly inserted into the terminal insertion slot 110, thereby realizing the connection between the BMS circuit board and the coil terminal 300. The terminal insertion slot 110 facilitates the connection between the coil terminal 300 and the BMS circuit board.

[0027] By providing a terminal insertion slot 110 on the outer wall of the housing 100, the coil terminal 300 of the drive coil 230 does not need to be soldered to the BMS circuit board. During assembly, it can be connected by a connector that is connected to the BMS circuit board. The operator can easily insert the connector into the terminal insertion slot 110 to connect the coil terminal 300 and the BMS circuit board.

[0028] In addition, the terminal plug slot 110 allows the coil wiring terminal 300 of the drive coil 230 to be connected to the BMS circuit board without soldering, which not only improves assembly efficiency but also facilitates the replacement of contactors within the BDU module.

[0029] It should be noted that the wiring plug of the BMS circuit board is inserted into the terminal plug slot 110 to achieve circuit connection. With this setting, there will be no loosening of mechanical connections such as soldering or crimping due to vibration and thermal expansion and contraction.

[0030] It should be noted that a guide groove 111 is provided on the inner wall of the terminal plug groove 110. A guide rib 112 is provided on the inner wall of the terminal plug groove 110. A snap-fit ​​interface 113 for engaging with a wiring plug is provided on the side wall of the terminal plug groove 110.

[0031] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in an optional embodiment, the coil terminal 300 is provided with a buckle 310 for fixing the cable at the end connected to the drive coil 230.

[0032] Specifically, a latch 310 is provided at the end of the coil terminal 300 that is connected to the drive coil 230. During connection, the cable of the drive coil 230 is clipped into the latch 310, and then the drive coil 230 and the latch 310 are welded together by resistance welding. This improves the connection stability of the drive coil 230 and the latch 310 after welding, and eliminates the need for solder, thus avoiding the risk of cold solder joints and solder splatter.

[0033] See Figure 1 , Figure 2, Figure 3 , Figure 4 and Figure 5 As shown, in an optional embodiment, the drive assembly 200 includes an outer core bushing assembly 210, a frame assembly 220, a drive coil 230, a moving core 240, and a drive shaft 250. The frame assembly 220 is disposed on the outer core bushing assembly 210, the drive coil 230 is wound on the frame assembly 220, the moving core 240 is slidably disposed within the drive coil 230, and there is an annular space between the moving core 240 and the drive coil 230. The drive shaft 250 is inserted into the moving core 240. The top of the frame assembly 220 is provided with a support base 221 for supporting the coil terminal 300, and a portion of the coil terminal 300 is embedded in the support base 221.

[0034] Specifically, the drive coil 230 is mounted on the frame assembly 220, and the moving iron core 240 is slidably mounted inside the drive coil 230. When the drive coil 230 is energized, it can drive the moving iron core 240 to move upward, thereby causing the moving iron core 240 to drive the drive shaft 250 to move upward, so as to realize the contact between the moving contact and the stationary contact of the contactor.

[0035] In the production of the skeleton assembly 220, a portion of the coil terminal 300 can be pre-embedded in the support base 221 to improve subsequent assembly efficiency, eliminating the need for additional fixing of the coil terminal 300.

[0036] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in an optional embodiment, the drive shaft 250 and the moving iron core 240 are welded together.

[0037] Specifically, the drive shaft 250 and the moving iron core 240 are welded together by laser welding. Laser welding forms a metallurgical bond between metal atoms, and the joint strength can reach or even exceed that of the base material itself, which is far superior to riveting or interference fit. It can completely eliminate the problem of loose connection, perfectly cope with the huge mechanical impact of contactor opening and closing, and improve connection strength and vibration resistance.

[0038] During the welding process, a precision fixture ensures the coaxiality of the drive shaft 250 and the moving iron core 240. Laser welding is a non-contact process that requires no additional pressure, and the shrinkage rate after cooling is controllable. This results in extremely high coaxiality and axial positional accuracy between the moving iron core 240 and the drive shaft 250, guaranteeing the precision and stability of the contactor's operating stroke.

[0039] Laser welding is fast, and once the process parameters are determined, it can be stably and repeatedly executed by robots or automated equipment. The quality consistency is far superior to traditional manual or semi-automatic riveting and gluing processes, making it very suitable for large-scale mass production. It is efficient, stable, and easy to automate.

[0040] In addition, the laser welding method allows the moving iron core 240 and the drive shaft 250 to each use the optimal materials. For example, the moving iron core 240 can be made of high-permeability pure iron or silicon steel, and the drive shaft 250 can be made of high-strength, wear-resistant stainless steel. The laser welding method is then used to achieve the best cost performance of the overall components and improve design flexibility.

[0041] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in the optional embodiment, the bottom shell 120 of the outer shell 100 is provided with a positioning pin 130, and the outer iron core bushing assembly 210 is provided with a positioning hole 211 for matching the positioning pin 130.

[0042] Specifically, a positioning pin 130 is provided on the bottom shell 120 of the outer shell 100, and a useful positioning hole 211 is opened on the outer iron core bushing assembly 210. The cooperation between the positioning pin 130 and the positioning hole 211 provides direct physical guidance. During automated production, the robot does not need high-precision vision assistance and repeated fine adjustments, so that the placement and positioning can be completed in one go, significantly shortening the production line cycle of a single product and greatly improving assembly efficiency. Moreover, the accurate and reliable first-time assembly success rate reaches 100%, completely eliminating the manual inspection and adjustment links, and making the entire line truly "unmanned".

[0043] Moreover, the positioning pin 130 and the positioning hole 211, through mechanical hard limiting, ensure the absolute accuracy of the component in the X and Y directions and rotation angle, completely eliminating the problem of poor fit caused by tolerance accumulation and placement deviation.

[0044] In addition, the smooth pin hole guidance avoids hard impacts and scratches during the assembly process, effectively protecting the electroplating layer of the outer iron core bushing assembly 210 and the appearance of the bottom shell 120, while eliminating internal stress and improving product consistency and yield.

[0045] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in an optional embodiment, the bottom of the housing 100 is provided with a connecting base 140 for connecting to the BUD base.

[0046] Specifically, a connecting base 140 is provided at the bottom of the outer casing 100, and the connecting base 140 can be fixed to the base inside the BUD module by means of threaded parts.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage DC contactor, characterized in that, include: Housing (100), drive assembly (200) and coil terminals (300); The drive assembly (200) is disposed inside the housing (100). The drive coil (230) of the drive assembly (200) is welded to one end of the coil terminal (300). The housing (100) is provided with a terminal insertion slot (110). The other end of the coil terminal (300) is disposed in the terminal insertion slot (110) so that the wiring plug of the BMS circuit board is inserted into the terminal insertion slot (110).

2. The high-voltage DC contactor according to claim 1, characterized in that, The coil terminal (300) is provided with a buckle (310) for fixing the cable at the end connected to the drive coil (230).

3. The high-voltage DC contactor according to claim 2, characterized in that, The drive coil (230) and the buckle (310) are welded together by resistance welding.

4. The high-voltage DC contactor according to claim 1, characterized in that, The drive assembly (200) includes an outer iron core bushing assembly (210), a frame assembly (220), a drive coil (230), a moving iron core (240), and a drive shaft (250). The skeleton assembly (220) is disposed on the outer iron core bushing assembly (210), the drive coil (230) is wound on the skeleton assembly (220), the moving iron core (240) is slidably disposed inside the drive coil (230), there is an annular space between the moving iron core (240) and the drive coil (230), and the drive shaft (250) is inserted into the moving iron core (240); The top of the skeleton assembly (220) is provided with a support base (221) for supporting the coil terminal (300), and a portion of the coil terminal (300) is embedded in the support base (221).

5. The high-voltage DC contactor according to claim 4, characterized in that, The drive shaft (250) and the moving iron core (240) are welded together.

6. The high-voltage DC contactor according to claim 4, characterized in that, The bottom shell (120) of the outer shell (100) is provided with a positioning pin (130), and the outer iron core bushing assembly (210) is provided with a positioning hole (211) for matching the positioning pin (130).

7. The high-voltage DC contactor according to claim 1, characterized in that, The inner wall of the terminal plug slot (110) is provided with a guide groove (111).

8. The high-voltage DC contactor according to claim 7, characterized in that, The inner wall of the terminal plug groove (110) is provided with guide ribs (112).

9. The high-voltage DC contactor according to claim 7, characterized in that, The side wall of the terminal plug slot (110) is provided with a snap-fit ​​interface (113) for engaging with the wiring plug.

10. The high-voltage DC contactor according to claim 1, characterized in that, The bottom of the housing (100) is provided with a connecting base (140) for connecting to the BUD base.

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