High-voltage direct-current relay and battery pack circuit breaking unit

Abstract

The utility model relates to the technical field of relays, and discloses a high-voltage direct-current relay and a battery pack circuit breaking unit. According to the high-voltage direct-current relay provided by the utility model, the composite pole is used for replacing a copper pole in the existing scheme, and the melting point of the first material layer in the composite pole is lower than that of a copper material, so that the first material layer can be fixedly connected with the shell by reducing the temperature during brazing; energy consumed during welding can be reduced, and then the machining cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, and in particular to a high-voltage direct current relay and a battery pack disconnect unit. Background Art

[0002] High-voltage DC relays, like traditional relays, are switches that control high voltage (high current) through low voltage (low current). They are currently widely used in new energy vehicles, rail transit, charging piles, energy storage and other industries.

[0003] In the conventional scheme, the busbar is selected as a copper busbar, and the pole installed on the relay housing is a copper pole. During installation, the copper busbar and the copper pole are connected and fixed with bolts. When the relay is started, the coil is energized, driving the push rod to move, and driving the spring to store energy, so that the moving contact is close to the copper layer until the moving contact contacts the copper pole to form a passage. However, when installing the copper pole on the relay housing, welding is often used. Due to the high melting point of copper, more energy is consumed during welding, resulting in higher costs. Utility Model Content

[0004] In view of this, the utility model provides a high-voltage DC relay and a battery pack disconnect unit to solve the problem of high welding cost.

[0005] In a first aspect, the utility model provides a high-voltage DC relay, which includes a housing and a composite pole. Specifically, the housing is provided with a mounting hole; the composite pole is inserted into the mounting hole, and the composite pole includes a first material layer and a second material layer, the first material layer is in contact with the housing, and one end of the second material layer extends toward the inside of the housing to contact or separate from the moving contact; wherein the melting point of the first material layer is lower than the melting point of the copper material.

[0006] Beneficial effect: By using a composite pole to replace the copper pole in the existing solution, and making the melting point of the first material layer in the composite pole lower than the melting point of the copper material, the temperature during brazing can be reduced so that the first material layer can be connected and fixed to the shell. Such a setting can reduce the energy consumed during welding, thereby reducing the processing cost.

[0007] In an optional embodiment, the high-voltage DC relay also includes an insulating member, which is fixedly installed inside the shell, and is sleeved outside the composite pole, and the bottom end surface of the insulating member is located below the contact surface between the first material layer and the second material layer.

[0008] Beneficial effect: By arranging an insulating member in the shell, it is convenient to separate the composite pole from the inside of the shell when the composite pole is installed on the shell. Specifically, by sleeve-fitting the insulating member outside the composite pole and making the bottom end surface of the insulating member below the contact surface of the first material layer and the second material layer, it is avoided that the high-temperature arc generated when the moving contact and the static contact contact directly act on the first material layer and melt the first material layer, the first material layer of the composite pole is protected, the service life of the composite pole is extended, and the passage is prevented from being disconnected at the composite pole, making the passage more reliable.

[0009] In an optional embodiment, in the composite pole and the insulating member, one of them is provided with an annular groove, and the other of them is provided with an annular protrusion, and the annular protrusion is used to be inserted into the annular groove.

[0010] In an optional embodiment, in the first material layer and the second material layer, one of them has an inserting portion and / or an abutting portion, the inserting portion is used to be inserted into the mounting hole, the abutting portion is used to abut against the shell, and the other is connected to one of the two.

[0011] In an optional embodiment, when the aluminum layer has the inserting portion and the abutting portion, the inserting portion is used to be inserted into the mounting hole, and the abutting portion is used to abut against the outer wall or the inner wall of the shell.

[0012] In an optional embodiment, the melting point of the first material layer ranges from 600°C to 700°C, and the melting point of the second material layer ranges from 1000°C to 1200°C.

[0013] In an optional embodiment, the first material layer is an aluminum layer, and the second material layer is a copper layer. The aluminum layer is used to be electrically connected to the bus bar, and the copper layer is used to contact or separate from the moving contact.

[0014] In an optional embodiment, an opening is provided at the bottom of the shell; the high-voltage DC relay also includes a connector and a metal plate, the connector is installed at the opening of the shell; the metal plate is located on a side of the connector away from the shell; wherein the connector is used to connect and fix the shell and the metal plate.

[0015] In an optional embodiment, the metal plate is centrally provided with a through hole; the high-voltage DC relay further comprises a yoke, a transmission assembly and a contact bridge, the yoke being mounted on a side of the metal plate away from the housing; the transmission assembly comprises at least a driving structure and a moving shaft, the moving shaft being passed through the through hole, the first end of the moving shaft being located inside the yoke, the second end of the moving shaft being located inside the housing, the first end of the moving shaft being used to move along the axial direction of the moving shaft driven by the driving structure; the contact bridge being mounted on the second end of the moving shaft, the contact bridge being provided with a pair of moving contacts.

[0016] In an optional embodiment, the high-voltage DC relay further includes a stationary iron core, a moving iron core, a coil bracket and a coil. Specifically, the stationary iron core is located inside the magnetic yoke, and the stationary iron core is installed on the end face of the metal plate away from the shell; the moving iron core is located inside the magnetic yoke, and the moving iron core is installed at the first end of the moving shaft, and the moving iron core is spaced apart from the stationary iron core along the axial direction of the moving shaft; the coil bracket is installed inside the magnetic yoke, and the coil bracket is centrally provided with an installation chamber for installing the stationary iron core and the moving iron core, and is used for the moving iron core to approach or move away from the stationary iron core along the axial direction of the moving shaft in the installation chamber; the coil is installed on the coil bracket; wherein the stationary iron core and the stationary iron core are located inside the coil.

[0017] Beneficial effect: By placing the coil bracket inside the yoke and installing the coil on the coil bracket, the yoke acts as a magnetic shielding component. After the coil is energized, it can reduce leakage magnetic flux and improve the reliability of the moving iron core moving to the static iron core side.

[0018] In a second aspect, the utility model further provides a battery pack disconnect unit, comprising the high-voltage DC relay provided in the first aspect.

[0019] Beneficial effect: Because the battery pack circuit breaker unit includes a high-voltage DC relay, it has the same effect as the high-voltage DC relay and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the specific implementation methods of the present utility model, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A cross-sectional view of a high voltage DC relay according to an embodiment of the utility model;

[0022] Figure 2A partial cross-sectional view of a high voltage DC relay according to an embodiment of the utility model;

[0023] Figure 3 A partial cross-sectional view of a high voltage DC relay according to an embodiment of the utility model;

[0024] Figure 4 A cross-sectional view of a composite pole in a high voltage DC relay according to an embodiment of the utility model;

[0025] Figure 5 for Figure 1 A partial enlarged view of the central static iron core and the mounting base;

[0026] Figure 6 A cross-sectional view of another high voltage DC relay according to an embodiment of the utility model;

[0027] Figure 7 A partial cross-sectional view of another high voltage DC relay according to an embodiment of the utility model;

[0028] Description of reference numerals:

[0029] 1. High-voltage DC relay; 101. Housing; 1011. Mounting hole; 102. Composite pole; 1021. First material layer; 1022. Second material layer; 1023. Plug-in portion; 1024. Abutment portion; 103. Insulator; 104. Connector; 105. Metal plate; 106. Yoke; 107. Moving shaft; 1071. First end; 1072. Second end; 108. Contact bridge; 109. Stationary iron core; 110. Moving iron core; 111. Coil bracket; 112. Coil; 113. First elastic member; 114. Mounting seat; 115. Second elastic member. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0031] In the description of the present application, it should be understood that the terms "upper", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] See also Figures 1 to 7 , Figure 1 A cross-sectional view of a high voltage DC relay provided in an embodiment of the present application is shown; Figure 2 A partial cross-sectional view of a high-voltage DC relay provided in an embodiment of the present application is shown;

[0035] Figure 3 A partial cross-sectional view of a high-voltage DC relay provided in an embodiment of the present application is shown; Figure 4 A cross-sectional view of a composite pole in a high-voltage DC relay provided in an embodiment of the present application is shown; Figure 5 for Figure 1 A partial enlarged view of the central static iron core and the mounting base; Figure 6 A cross-sectional view of another high voltage DC relay provided in an embodiment of the present application is shown; Figure 7 A partial cross-sectional view of yet another high-voltage DC relay provided in an embodiment of the present application is shown.

[0036] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0037] The present application provides a high voltage DC relay 1, such as Figures 1 to 7 As shown, it includes a housing 101 and a composite pole 102. Specifically, the housing 101 is provided with a mounting hole 1011; the composite pole 102 is passed through the mounting hole 1011, and the composite pole 102 includes a first material layer 1021 and a second material layer 1022, wherein the first material layer 1021 is in contact with the housing 101, and one end of the second material layer 1022 extends toward the inside of the housing 101 to contact or separate from the moving contact; wherein the melting point of the first material layer 1021 is lower than the melting point of the copper material.

[0038] By utilizing the technical solution of this embodiment, by using a composite pole 102 to replace the copper pole in the existing solution, and making the melting point of the first material layer 1021 in the composite pole 102 lower than the melting point of the copper material, the temperature during brazing can be reduced so that the first material layer 1021 can be connected and fixed to the shell 101. Such a setting can reduce the energy consumed during welding, thereby reducing the processing cost.

[0039] Among them, preferably, the melting point range of the first material layer is between 600℃ and 700℃, the melting point range of the second material layer is between 1000℃-1200℃, and the melting point of the bus is close to the melting point of the first material layer. For example, the melting point of the bus is within 100℃ of the melting point of the first material layer, for example, the difference is within 10℃, within 20℃, within 50℃ or within 80℃, etc.

[0040] It can be explained that the high-voltage DC relay 1 provided in the present application also includes an insulating part 103, which is fixedly installed inside the shell 101. The insulating part 103 is sleeved on the outside of the composite pole 102, and the bottom end face of the insulating part 103 is located below the contact surface between the first material layer 1021 and the second material layer 1022.

[0041] By utilizing the technical solution of the present embodiment, an insulating member 103 is provided in the shell 101, so that the composite pole 102 can be separated from the inner wall of the shell 101 when the composite pole 102 is installed on the shell 101. Specifically, by sleeved on the outside of the composite pole 102, and making the bottom end surface of the insulating member 103 below the contact surface of the first material layer 1021 and the second material layer 1022, it is prevented that the high-temperature arc generated when the moving contact and the second material layer 1022 contact directly acts on the first material layer 1021 and melts the first material layer 1021, thereby protecting the first material layer 1021 of the composite pole 102, extending the service life of the composite pole 102, and preventing the path from being disconnected at the composite pole 102, so that the relay is more reliable.

[0042] For example, in the embodiment of the present application, after the insulating member 103 is installed at the composite pole 102, the composite pole 102 is restricted from moving along its axial direction. For example, in the composite pole 102 and the insulating member 103, one of them is provided with an annular groove, and the other of them is provided with an annular protrusion, and the annular protrusion is used to be inserted into the annular groove.

[0043] Of course, in other optional implementations, the composite pole 102 is bonded and fixed to the insulating member 103 .

[0044] By utilizing the technical solution of this embodiment, when the moving contact contacts the composite pole 102, even if a thrust is applied to the composite pole 102 to separate from the shell 101, the insulating member 103 will limit the axial movement of the composite pole 102, thereby preventing the composite pole 102 from separating from the shell 101, without increasing the brazing strength, thereby reducing the processing cost.

[0045] It can be explained that if Figure 1 , Figure 2 , Figures 4 to 6 As shown, the materials of the first material layer 1021 and the second material layer 1022 in the composite pole 102 are not specifically limited, and the melting point of the first material layer 1021 is only required to be lower than the melting point of the copper material, and the melting point of the second material layer 1022 is greater than the melting point of the first material layer 1021. Specifically, the material can be selected according to the material of the busbar, and preferably the melting point of the first material layer 1021 is close to the melting point of the busbar, so as to facilitate the connection of the busbar and the first material layer 1021 by brazing.

[0046] As one implementation manner, the first material layer 1021 is an aluminum layer, and the second material layer 1022 is a copper layer. The aluminum layer is used to be electrically connected to the bus bar, and the copper layer is used to contact or separate from the moving contact.

[0047] Furthermore, the high-voltage DC relay 1 provided in the present application is exemplified by taking the first material layer 1021 as an aluminum layer and the second material layer 1022 as a copper layer as an example.

[0048] The embodiments of the present application do not specifically limit the structures of the aluminum layer and the copper layer.

[0049] In one embodiment, one of the aluminum layer and the copper layer of the composite pole 102 is provided with a plug-in portion 1023 and / or abutment portion 1024, the plug-in portion 1023 is used to be plugged into the mounting hole 1011, and the abutment portion 1024 is used to abut against the shell 101, and the other one of the two can be connected to one of them.

[0050] Specifically, when the abutment portion 1024 is installed outside the shell 101, the abutment portion 1024 abuts against the outer wall of the shell 101, the end of the plug-in portion 1023 close to the abutment portion 1024 is connected to the abutment portion 1024, and the end of the plug-in portion 1023 away from the abutment portion 1024 extends in the mounting hole 1011 and extends toward the inside of the shell 101; when the abutment portion 1024 is installed in the shell 101, the abutment portion 1024 abuts against the inner wall of the shell 101, the end of the plug-in portion 1023 close to the abutment portion 1024 is connected to the abutment portion 1024, and the end of the plug-in portion 1023 away from the abutment portion 1024 extends in the mounting hole 1011 and extends toward the outside of the shell 101 until it extends to the outside of the shell 101.

[0051] Further, in the aluminum layer and the copper layer, the other one is separated from the external environment of the housing by one of the other two.

[0052] For example, in the aluminum layer and the copper layer, one of them has the plug-in portion 1023, and the other of them has the abutment portion 1024, and the abutment portion 1024 is connected to the plug-in portion 1023. For another example, in the aluminum layer and the copper layer, one of them has both the plug-in portion 1023 and the abutment portion 1024, and the other of them is connected to the other of them.

[0053] As one embodiment, when the aluminum layer has both the plug-in portion 1023 and the abutment portion 1024, Figure 1 and Figure 2 As shown, if the abutting portion 1024 is installed outside the housing 101 and abuts against the outer wall of the housing 101, the plug-in portion 1023 extends from the mounting hole 1011 toward the inside of the housing 101 and connects to the copper layer installed in the housing 101; Figure 6 and Figure 7 As shown, if the abutting portion 1024 is installed inside the shell 101 and abuts against the inner wall of the shell 101, the copper layer is located inside the shell 101, connected to the abutting portion 1024, and located on the side of the abutting portion 1024 away from the mounting hole 1011.

[0054] As another embodiment, the aluminum layer has an inserting portion 1023 , and the copper layer has an abutting portion 1024 .

[0055] Of course, in other optional embodiments, the aluminum layer is a sheet structure and is disposed outside the shell 101. In this case, the copper layer has both a plug-in portion 1023 and a contact portion 1024. In this case, the plug-in portion 1023 extends out of the shell 101 and is connected to the aluminum layer.

[0056] It can be explained that the material of the aluminum layer is not specifically limited. It can be pure aluminum or aluminum alloy. Preferably, aluminum alloy is selected. Similarly, the copper layer is preferably copper.

[0057] like Figures 1 to 6 As shown, an opening is provided at the bottom of the shell 101; the high-voltage DC relay 1 also includes a connector 104 and a metal plate 105, the connector 104 is installed at the opening of the shell 101; the metal plate 105 is located on the side of the connector 104 away from the shell 101; wherein the connector 104 is used to connect and fix the shell 101 and the metal plate 105.

[0058] Specifically, the metal plate 105 is provided with a through hole; the high-voltage DC relay 1 also includes a yoke 106, a transmission assembly and a contact bridge 108, the yoke 106 is installed on the side of the metal plate 105 away from the housing 101; the transmission assembly at least includes a driving structure and a moving shaft 107, the moving shaft 107 is passed through the through hole, the first end 1071 of the moving shaft 107 is located inside the yoke 106, the second end 1072 of the moving shaft 107 is located inside the housing 101, and the first end 1071 of the moving shaft 107 is used to move along the axial direction of the moving shaft 107 under the drive of the driving structure; the contact bridge 108 is installed at the second end 1072 of the moving shaft 107, and the contact bridge 108 is provided with a pair of moving contacts, and at this time, the pair of moving contacts are symmetrically distributed along the axis of the moving shaft 107.

[0059] It can be explained that there is no specific limitation on the material of the connecting member 104. Preferably, the connecting member 104 is made of aluminum alloy.

[0060] Similarly, there is no specific limitation on the material of the metal plate 105. Preferably, the metal plate 105 is made of aluminum alloy, and the aluminum alloy contains a certain proportion of magnetic elements such as iron, nickel, and cobalt, which is common knowledge and will not be described in detail here.

[0061] Similarly, the housing 101 is made of porcelain.

[0062] It can be explained that the connection methods between the composite pole 102 and the housing 101 , the housing 101 and the connector 104 , and the connector 104 and the metal plate 105 are not specifically limited.

[0063] For example, welding, such as brazing, friction stir welding, ultrasonic welding or laser welding, is selected. Preferably, brazing is selected, and by making the metal plate 105 and the connector 104 consistent with the aluminum layer, the brazing temperature between the composite pole 102 and the shell 101, the shell 101 and the connector 104, and the connector 104 and the metal plate 105 can be reduced, thereby reducing production energy consumption.

[0064] like Figures 1 to 6 As shown, the high-voltage DC relay 1 provided in the present application further includes a static iron core 109 , a moving iron core 110 , a coil support 111 and a coil 112 .

[0065] Specifically, the static iron core 109 is located inside the magnetic yoke 106, and the static iron core 109 is installed on the end surface of the metal plate 105 away from the shell 101; the moving iron core 110 is located inside the magnetic yoke 106, and the moving iron core 110 is installed at the first end 1071 of the moving shaft 107, and the moving iron core 110 is spaced apart from the static iron core 109 along the axial direction of the moving shaft 107; the coil bracket 111 is installed inside the magnetic yoke 106, and the coil bracket 111 is centrally provided with an installation chamber for installing the static iron core 109 and the moving iron core 110, and is used for the moving iron core 110 to approach or move away from the static iron core 109 along the axial direction of the moving shaft 107 in the installation chamber; the coil 112 is installed on the coil bracket 111; wherein, the static iron core 109 and the static iron core 109 are located inside the coil 112.

[0066] By using the technical solution of this embodiment, the coil support 111 is placed inside the magnetic yoke 106, and the coil 112 is installed on the coil support 111. At this time, the magnetic yoke 106 serves as a magnetic shielding component. After the coil 112 is energized, magnetic leakage can be reduced, and the reliability of the moving iron core 110 moving to the side of the static iron core 109 can be improved. When the moving iron core 110 is installed at the first end 1071 of the moving shaft 107, if the coil 112 is energized, the magnetic field force generated will drive the moving iron core 110 to approach the static iron core 109. In this process, the moving iron core 110 drives the first end 1071 of the moving shaft 107 to move along the axial direction of the moving shaft 107.

[0067] It can be explained that there is no specific limitation on the connection method between the static iron core 109 and the metal plate 105. They can be connected by bonding, riveting or bolts.

[0068] Preferably, the static iron core 109 and the metal plate 105 are connected by riveting. Specifically, the metal plate 105 is provided with a through hole, and the static iron core 109 is provided with a riveting protrusion, and the riveting protrusion is inserted into the through hole and then riveted using a riveting tool.

[0069] Furthermore, the riveted protrusion is provided with a riveting hole, which is centrally arranged. After riveting, the moving shaft 107 is used to penetrate the riveting hole during the process of being inserted into the static iron core 109 .

[0070] like Figure 1 and Figure 6 As shown, an end of the static iron core 109 close to the moving iron core 110 and an end of the moving iron core 110 close to the static iron core 109 are both provided with receiving grooves, and the two receiving grooves are arranged at intervals along the axial direction of the moving shaft 107 and are connected; the high-voltage DC relay 1 also includes a reset structure, and the reset structure includes a first elastic member 113, and the elastic ends of the first elastic member 113 are respectively located in the two receiving grooves.

[0071] By utilizing the technical solution of the present embodiment, receiving grooves are provided at the end of the static iron core 109 close to the moving iron core 110 and the end of the moving iron core 110 close to the static iron core 109, and the two receiving grooves are spaced apart and connected along the axial direction of the moving shaft 107, and the first elastic member 113 is placed in the two receiving grooves respectively. When the coil 112 is energized, the push rod moves along its axial direction, driving the moving iron core 110 to move, causing the first elastic member 113 to deform and store energy. After the coil 112 is de-energized, the magnetic field force acting on the moving iron core 110 disappears. At this time, the first elastic member 113 releases energy, driving the moving iron core 110 away from the static iron core 109.

[0072] like Figures 1 to 6 As shown, the high-voltage DC relay 1 provided in the present application also includes a mounting base 114, which is mounted on the end surface of the metal plate 105 close to the shell 101; the reset structure includes a second elastic member 115, and the elastic ends of the second elastic member 115 are respectively connected to the contact bridge 108 and the mounting base 114.

[0073] Utilizing the technical solution of this embodiment, a mounting seat 114 is installed on the end face of the metal plate 105 close to the shell 101, a second elastic member 115 is added, and the elastic ends of the second elastic member 115 are respectively connected to the contact bridge 108 and the mounting seat 114. When the coil 112 is energized, the push rod moves upward along its axial direction, driving the second elastic member 115 to deform, and the second elastic member 115 stores energy. After the coil 112 is de-energized, the magnetic field force acting on the moving iron core 110 disappears. At this time, the second elastic member 115 releases energy, driving the push rod to move downward along its axial direction, driving the moving iron core 110 away from the static iron core 109.

[0074] It can be explained that there is no specific limitation on the type of the first elastic member 113 and the second elastic member 115. For example, the type can be any one of a spring and a torsion spring.

[0075] In a second aspect, the utility model further provides a battery disconnect unit (Battery Disconnect Unit, referred to as BDU), comprising the high-voltage DC relay 1 provided in the first aspect.

[0076] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A high voltage DC relay, characterized in that: include: A housing (101), wherein the housing (101) is provided with a mounting hole (1011); A composite pole (102), the composite pole (102) being inserted into the mounting hole (1011), the composite pole (102) comprising a first material layer (1021) and a second material layer (1022), the first material layer (1021) being in contact with the shell (101), and one end of the second material layer (1022) extending toward the inside of the shell (101) for contacting or separating with a moving contact; wherein the melting point of the first material layer (1021) is lower than the melting point of copper.

2. The high voltage DC relay according to claim 1, characterized in that: Also includes: An insulating member (103), the insulating member (103) is fixedly mounted inside the housing (101), the insulating member (103) is sleeved outside the composite pole (102), and the bottom end surface of the insulating member (103) is located below the contact surface between the first material layer (1021) and the second material layer (1022).

3. The high voltage DC relay according to claim 1, characterized in that: The melting point of the first material layer (1021) is between 600°C and 700°C, and the melting point of the second material layer (1022) is between 1000°C and 1200°C.

4. The high voltage DC relay according to claim 1, characterized in that: In the first material layer (1021) and the second material layer (1022), one of them has an inserting portion (1023) and / or an abutting portion (1024), the inserting portion (1023) is used to be inserted into the mounting hole (1011), the abutting portion (1024) is used to abut against the shell (101), and the other of the two is connected to one of the two.

5. The high voltage DC relay according to claim 4, characterized in that: When the first material layer (1021) has the plug-in portion (1023) and the abutment portion (1024), the plug-in portion (1023) is used to be plugged into the mounting hole (1011), and the abutment portion (1024) is used to abut against the outer wall or the inner wall of the shell (101).

6. The high voltage DC relay according to any one of claims 1 to 5, characterized in that: The first material layer (1021) is an aluminum layer, and the second material layer (1022) is a copper layer. The aluminum layer is used to be electrically connected to the bus bar, and the copper layer is used to be in contact with or separated from the moving contact.

7. The high voltage DC relay according to any one of claims 1 to 5, characterized in that: The bottom of the housing (101) is provided with an opening; The high voltage DC relay (1) further comprises: A connecting piece (104), the connecting piece (104) being installed at an opening of the housing (101); a metal plate (105), the metal plate (105) being located on a side of the connecting member (104) away from the housing (101); Wherein, the connecting member (104) is used to connect and fix the housing (101) and the metal plate (105).

8. The high voltage DC relay according to claim 7, characterized in that: The metal plate (105) is provided with a through hole in the center; The high voltage DC relay (1) further comprises: A magnetic yoke (106), the magnetic yoke (106) being mounted on a side of the metal plate (105) away from the housing (101); A transmission assembly, the transmission assembly at least comprising a driving structure and a moving shaft (107), the moving shaft (107) being inserted into the through hole, the first end (1071) of the moving shaft (107) being located inside the magnetic yoke (106), the second end (1072) of the moving shaft (107) being located inside the housing (101), and the first end (1071) of the moving shaft (107) being used to move along the axial direction of the moving shaft (107) under the drive of the driving structure; A contact bridge (108), wherein the contact bridge (108) is installed at the second end (1072) of the moving shaft (107), and the contact bridge (108) is provided with a pair of moving contacts.

9. The high voltage DC relay according to claim 8, characterized in that: The driving structure comprises: A static iron core (109), the static iron core (109) being located inside the magnetic yoke (106), and the static iron core (109) being mounted on an end surface of the metal plate (105) away from the housing (101); A moving iron core (110), the moving iron core (110) being located inside the magnetic yoke (106), the moving iron core (110) being mounted on a first end (1071) of the moving shaft (107), and the moving iron core (110) being spaced apart from the stationary iron core (109) along the axial direction of the moving shaft (107); A coil support (111), the coil support (111) being installed inside the magnetic yoke (106), the coil support (111) being centrally provided with an installation chamber for installing the static iron core (109) and the moving iron core (110), and being used for the moving iron core (110) to move closer to or farther away from the static iron core (109) along the axial direction of the moving shaft (107) in the installation chamber; A coil (112), wherein the coil (112) is mounted on the coil support (111); Wherein, the static iron core (109) and the static iron core (109) are located inside the coil (112).

10. A battery pack disconnect unit, characterized in that: It comprises the high voltage DC relay (1) according to any one of claims 1 to 9.

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