A relay, battery power distribution unit, and vehicle

Abstract

The application relates to the technical field of vehicles, and particularly provides a relay, a battery power distribution unit and a vehicle. The relay comprises a shell, a contact head, a main body part and a connecting part. Part of the main body part is exposed to the shell, the connecting part is connected to one end of the main body part away from the shell, and the length of the part of the main body part exposed to the shell is d1 in the extension direction of the contact head, and d1>2 mm. The application increases the length of the part of the main body part exposed to the shell, increases the distance between the connecting part and the shell, the heat generated during welding is not easily quickly transmitted to the shell and the internal structure, and the dangerous temperature reached by the shell and the internal structure during the welding process is reduced. It has been verified that when d1>2 mm, the temperature transmitted to the shell and the internal structure during welding is less than 100 DEG C, the damage risk of the shell and the internal structure of the relay during welding is as small as possible, the possible faults and safety risks of the relay during use are reduced, and the overall reliability and service life of the relay are improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a relay, a battery power distribution unit, and a vehicle. Background Technology

[0002] The BDU (Battery Distribution Unit) is the "blood vessel" of the power battery, serving to transmit current in the high-voltage circuit. The relay is the component with the highest internal resistance in the BDU. The internal resistance of the relay typically includes the internal resistance of the relay itself, as well as the contact resistance between it and the copper busbar.

[0003] To reduce the contact resistance between the relay contacts and the copper busbar, related technologies have used welding to fix the relay contacts and copper busbar. However, tests have shown that the temperature transmitted to the housing and internal structure during welding exceeds 100°C, posing a risk of damaging the housing and internal structure. Summary of the Invention

[0004] The purpose of this application is to provide a relay, a battery distribution unit, and a vehicle that minimizes the risk of damage to the relay housing and internal structure during welding.

[0005] To solve the above-mentioned technical problems, this application provides a relay, comprising:

[0006] case;

[0007] The contact includes a main body and a connecting portion for connecting to a copper busbar. A portion of the main body is exposed outside the housing. The connecting portion is connected to the end of the main body away from the housing. In the extending direction of the contact, the length of the portion of the main body exposed outside the housing is d1, and the value of d1 is in the range of d1 > 2 mm.

[0008] In this embodiment, the length d1 of the portion of the relay body exposed outside the housing is increased, which is equivalent to increasing the distance between the connecting part and the housing. Due to the larger distance between the connecting part and the housing, the heat generated during welding is less likely to be quickly transferred to the housing and internal structure, thus reducing the dangerous temperature reached by the housing and internal structure during welding. Simultaneously, when welding the copper busbar and the connecting part, the distance between the copper busbar and the relay housing is not less than 2mm, creating a larger heat dissipation space that helps dissipate heat and reduces heat transfer to the housing and its internal structure. Verification shows that when d1 > 2mm, the temperature transferred to the housing and internal structure during welding is less than 100℃, minimizing the risk of damage to the relay housing and internal structure during welding, reducing potential malfunctions and safety risks during relay use, and improving the overall reliability and service life of the relay. Furthermore, by welding the copper busbar and the connecting part, a low contact resistance connection can be achieved, which is beneficial for improving the electrical performance of the relay.

[0009] Therefore, this embodiment of the relay effectively solves the problem of potential damage to the relay housing and internal structure caused by high temperature during the welding process through simple structural improvements, while maintaining the high performance and reliability of the relay.

[0010] Optionally, the lateral width of the connecting part is d2, and the value range of d2 is: d2≥7mm.

[0011] Optionally, the relay further includes:

[0012] A sampling element is partially installed inside the housing. One end of the sampling element has a contact connection portion, which is an arc-shaped structure that matches the peripheral wall of the main body. The contact connection portion and the contact are electrically connected. The other end of the sampling element has a sampling terminal, which extends from the wall of the housing away from the contact.

[0013] Optionally, the sampling element further includes a first connecting segment, a second connecting segment, a third connecting segment, and a fourth connecting segment connected in sequence. The first connecting segment is connected to the contact connecting portion, and the fourth connecting segment is connected to the sampling terminal. The first connecting segment extends along a first direction, the second connecting segment and the fourth connecting segment extend along a second direction, and the third connecting segment extends along the third direction.

[0014] Wherein, the extension direction of the contact is the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0015] Optionally, the relay further includes:

[0016] An electromagnetic assembly, comprising a lead frame connected to a control terminal extending from the back wall of the housing toward the contact.

[0017] This application also provides a battery power distribution unit, including:

[0018] The aforementioned relay;

[0019] A copper busbar is welded and fixed to the connecting part.

[0020] The battery power distribution unit of this application includes the aforementioned relay, and therefore has the same technical effect as the aforementioned relay, which will not be repeated here.

[0021] Optionally, a stepped surface facing away from the housing is formed between the connecting part and the main body part, the copper busbar has a connecting hole, the connecting part passes through the connecting hole, and the copper busbar abuts against the side wall of the housing and the stepped surface.

[0022] Optionally, the thickness of the copper busbar is T, and the height of the connecting part is H, where the value of H is in the range of: H > T + 0.2 mm.

[0023] Optionally, the diameter of the connecting hole is d3, and the value of d3 is in the range of 0.1mm < d3 - d2 < 0.2mm.

[0024] Optionally, the end face of the connecting portion facing away from the housing is attached to the copper busbar.

[0025] Optionally, the flatness of the mating surfaces of the copper busbar and the connecting part is not greater than 0.1 mm.

[0026] Optionally, the thickness of the copper busbar is T, and the value of T is in the range of 2mm≤T≤3mm.

[0027] Optionally, the battery power distribution unit further includes:

[0028] A control circuit board having a control connection piece and a sampling connection piece, wherein the control terminal of the relay is attached to and electrically connected to the control connection piece, and the sampling terminal of the relay is attached to and electrically connected to the sampling connection piece.

[0029] Optionally, the control terminal and the control connecting piece are welded or snapped together to achieve electrical connection; the sampling terminal and the sampling connecting piece are welded or snapped together to achieve electrical connection.

[0030] This application also provides a vehicle including the aforementioned battery distribution unit.

[0031] The vehicle in this application includes the aforementioned battery power distribution unit, and therefore has the same technical effects as the aforementioned battery power distribution unit, which will not be repeated here. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a specific embodiment of the relay provided in this application;

[0033] Figure 2 for Figure 1 A schematic diagram of the relay at the second angle;

[0034] Figure 3 for Figure 1 Schematic diagram of the relay at the third angle;

[0035] Figure 4 for Figure 1 Component diagram of a relay;

[0036] Figure 5 for Figure 1 Top view of the first connection method between the relay and the copper busbar;

[0037] Figure 6 for Figure 5 A sectional view along the height direction;

[0038] Figure 7 for Figure 1 Top view of the second connection method between the relay and the copper busbar;

[0039] Figure 8 for Figure 7 A sectional view along the height direction;

[0040] in, Figures 1-8 The accompanying figure labels are as follows:

[0041] 1-Relay; 11-Housing; 12-Contact; 121-Main body; 122-Connecting part; 12A-Stepped surface; 13-Sampling element; 131-Contact connecting part; 132-Sampling terminal; 133-First connecting section; 134-Second connecting section; 135-Third connecting section; 136-Fourth connecting section; 13A-Body body; 13B-Insulating layer; 14-Electromagnetic assembly; 141-Control terminal;

[0042] 2-Copper busbar. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of a specific embodiment of the relay provided in this application; Figure 2 for Figure 1A schematic diagram of the relay at the second angle.

[0045] This embodiment provides a relay 1, including:

[0046] Casing 11;

[0047] The contact 12 includes a main body 121 and a connecting part 122 for connecting with the copper busbar 2. Part of the main body 121 is exposed outside the housing 11. The connecting part 122 is connected to the end of the main body 121 away from the housing 11. In the extending direction of the contact 12, the length of the part of the main body 121 exposed outside the housing 11 is d1, and the value of d1 is in the range of d1 > 2 mm.

[0048] In this embodiment, the length d1 of the portion of the main body 121 of the relay 1 exposed outside the housing 11 is increased, which is equivalent to increasing the distance between the connecting part 122 and the housing 11. Due to the large distance between the connecting part 122 and the housing 11, when the connecting part 122 and the copper busbar 2 are welded and fixed, the heat generated during welding is not easily transferred to the housing 11 and the internal structure, thereby reducing the dangerous temperature reached by the housing 11 and the internal structure during the welding process. At the same time, when welding the copper busbar 2 and the connecting part 122, the distance between the copper busbar 2 and the housing 11 of the relay 1 is not less than 2mm, and a large heat dissipation space is formed between the copper busbar 2 and the housing 11 of the relay 1, which helps to dissipate heat and reduces the transfer of heat to the housing 11 and its internal structure. It has been verified that when d1 > 2mm, the temperature transmitted to the housing 11 and internal structure during welding is less than 100℃, which minimizes the risk of damage to the housing 11 and internal structure of relay 1 during welding, reduces the possible failures and safety risks of relay 1 during use, and improves the overall reliability and service life of relay 1. Furthermore, by welding and fixing the copper busbar 2 and the connecting part 122, a low contact resistance connection can be achieved between the copper busbar 2 and the connecting part 122, which is beneficial to improving the electrical performance of relay 1.

[0049] Therefore, it can be seen that the relay 1 in this embodiment effectively solves the potential damage to the housing 11 and internal structure of the relay 1 caused by high temperature during the welding process through simple structural improvements, while maintaining the high performance and reliability of the relay 1.

[0050] Specifically, the value of d1 can be 2.3mm, 2.5mm, 2.8mm, 3mm, etc., which can reduce the risk of damage to the housing 11 and internal structure of relay 1 during welding, and make the structure of copper busbar 2 and relay 1 more compact after welding.

[0051] Furthermore, in this embodiment, the lateral width of the connecting part 122 is d2, and the value range of d2 is: d2≥7mm.

[0052] In this embodiment, by increasing the lateral width of the connecting portion 122, the mechanical strength of the relay 1 is improved, making its structure more robust and ensuring it can withstand greater mechanical stress and vibration, thus enhancing the durability of the relay 1. Furthermore, the larger connecting portion 122 helps increase the welding area between the connecting portion 122 and the copper busbar 2, improving the welding strength and ensuring the welding pull-out force of the copper busbar 2 and the connecting portion 122 meets the requirements. Verification shows that when d2 ≥ 7mm, the welding pull-out force of the copper busbar 2 and the connecting portion 122 is greater than 2000 N·m, meeting the performance requirements for vehicle use.

[0053] Specifically, the value of d2 can be 7.2mm, 7.4mm, 7.5mm, 7.6mm, 7.8mm, etc., in order to minimize material usage and reduce costs while meeting the performance requirements of the vehicle.

[0054] The lateral direction of the connecting part 122 refers to the direction perpendicular to the extension direction of the contact 12.

[0055] Please refer to Figure 3 and Figure 4 , Figure 3 for Figure 1 Schematic diagram of the relay at the third angle; Figure 4 for Figure 1 A diagram showing the components of a relay.

[0056] In this embodiment, relay 1 further includes:

[0057] The sampling component 13 is partially installed inside the housing 11. One end of the sampling component 13 has a contact connection portion 131, which is an arc-shaped structure that matches the peripheral wall of the main body portion 121. The contact connection portion 131 and the contact 12 are electrically connected. The other end of the sampling component 13 has a sampling terminal 132, which extends from the wall of the housing 11 away from the contact 12.

[0058] As described above, in this embodiment, relay 1 is equipped with a sampling component 13. The contact connection portion 131 of the sampling component 13 is directly electrically connected to the contact 12. The sampling terminal 132 of the sampling component 13 extends from the housing 11 and can be directly electrically connected to the control circuit board. The sampling component 13 is used to collect the load voltage signal of the contact 12, which facilitates the control circuit board to detect the high-voltage circuit and component status, ensuring the safe operation of the system. It can be seen that in this embodiment, by adding the sampling component 13, relay 1 achieves wireless high-voltage sampling, simplifies the assembly process of relay 1, facilitates the automated production of the battery power distribution unit, and improves production efficiency. Since the high-voltage sampling harness is eliminated, the potential contact problems caused by harness connection points can be reduced, improving the reliability of relay 1.

[0059] Meanwhile, in this embodiment, the contact connection portion 131 is an arc-shaped structure that matches the peripheral wall of the main body portion 121. First, the contact connection portion 131 can better adapt to the shape of the main body portion 121, thereby providing a more stable mechanical connection, reducing connection loosening caused by vibration or impact, and ensuring reliable connection between the contact connection portion 131 and the main body portion 121. Second, the arc-shaped structure design can also provide more uniform contact pressure, thereby ensuring better electrical contact between the contact connection portion 131 and the main body portion 121, reducing contact resistance, and improving sampling accuracy. Finally, the arc-shaped structure is also generally easier to align and assemble with the main body portion 121, reducing assembly complexity and improving assembly efficiency.

[0060] Please continue to refer to this. Figure 4 In some embodiments of this application, the sampling member 13 further includes a first connecting segment 133, a second connecting segment 134, a third connecting segment 135, and a fourth connecting segment 136 connected in sequence. The first connecting segment 133 is connected to the contact head connecting portion 131, and the fourth connecting segment 136 is connected to the sampling terminal 132. The first connecting segment 133 extends along a first direction, the second connecting segment 134 and the fourth connecting segment 136 extend along a second direction, and the third connecting segment 135 extends along a third direction.

[0061] The extension direction of the contact 12 is the second direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0062] As configured above, the first connecting segment 133 extends along a first direction to lead the second connecting segment 134 to the gap between the internal component and the housing 11. The second connecting segment 134 and the fourth connecting segment 136 extend along a second direction, allowing the sampling terminal 132 to extend from the wall of the housing 11 away from the contact 12. The third connecting segment 135 extends along a third direction and is used to adjust the extension position of the sampling terminal 132. Figure 4 It can be seen that the lengths of the third connecting segments 135 in the two sampling components 13 are different, ensuring that the sampling terminal 132 can extend from the required position, which facilitates electrical connection with the control circuit board.

[0063] Depend on Figure 4 As can be seen, in this embodiment, the sampling component 13 includes a body portion 13A. At least a portion of the outer surface of the body portion 13A, excluding the contact connection portion 131 and the sampling terminal 132, is covered with an insulating layer 13B. The insulating layer 13B serves to insulate, preventing the sampling component 13 from contacting other metal structures in the relay 1 as much as possible, and avoiding the occurrence of short circuits as much as possible.

[0064] In some embodiments of this application, the insulating layer 13B can be formed by injection molding, so that the insulating layer 13B can better fit the structure of the body part 13A and improve the connection stability between the insulating layer 13B and the body part 13A.

[0065] The material of the insulating layer 13B is not limited. In some embodiments of this application, the material of the insulating layer 13B includes, but is not limited to, plastic, rubber, etc.

[0066] Please continue to refer to this. Figure 3 and Figure 4 In this embodiment, relay 1 further includes:

[0067] The electromagnetic component 14 includes a lead frame connected to a control terminal 141, which extends from the wall of the back connection portion 122 of the housing 11.

[0068] As described above, the lead frame is connected to a control terminal 141, which extends directly from the housing 11 and is used for electrical connection with the control circuit board. This design avoids the need for additional control wiring harnesses to connect the relay 1 and the control circuit board, achieving a wireless control scheme, simplifying the assembly process of the relay 1, facilitating the automated production of the relay 1 and the battery power distribution unit, and improving production efficiency. By eliminating the control wiring harness, potential contact problems at wiring harness connection points can be reduced, improving the reliability of the relay 1.

[0069] Depend on Figure 3 As can be seen, in this embodiment, the control terminal 141 and the sampling terminal 132 extend from the same wall of the housing 11, which facilitates the connection of the control terminal 141, the sampling terminal 132 and the control circuit board.

[0070] This embodiment also provides a battery power distribution unit, including:

[0071] The aforementioned relay 1;

[0072] Copper busbar 2 and connecting part 122 are welded and fixed.

[0073] The battery power distribution unit in this embodiment includes the aforementioned relay 1, and therefore has the same technical effect as the aforementioned relay 1, which will not be repeated here.

[0074] The copper busbar 2 and the connecting part 122 can be fixed by laser welding to ensure the reliability of their connection and effectively reduce the contact resistance.

[0075] Please refer to Figure 5 and Figure 6 , Figure 5 for Figure 1 Top view of the first connection method between the relay and the copper busbar; Figure 6 for Figure 5 A sectional view along the height direction.

[0076] In some embodiments, a stepped surface 12A facing away from the housing 11 is formed between the connecting portion 122 and the main body portion 121. The copper busbar 2 has a connecting hole through which the connecting portion 122 passes. The copper busbar 2 abuts against the side wall and the stepped surface 12A of the housing 11.

[0077] As described above, the connecting part 122 passes through the connecting hole, and the copper busbar 2 abuts against the side wall and the stepped surface 12A of the housing 11. This helps to improve the positioning accuracy of the connecting part 122 and the copper busbar 2 during welding, and facilitates the welding and fixing of the connecting part 122 and the copper busbar 2. Since the connecting part 122 passes through the copper busbar 2, there is no need to consider the influence of the thickness of the copper busbar 2 on the welding. The thickness of the copper busbar 2 can be increased, thereby improving the structural reliability of the copper busbar 2.

[0078] Furthermore, in this embodiment, the thickness of the copper busbar 2 is T, and the height of the connecting part 122 is H, where the value of H is in the range of: H > T + 0.2 mm.

[0079] As set up above, the difference between the thickness of the copper busbar 2 and the height of the connecting part 122 is greater than 0.2mm. That is, when assembled and not welded, part of the connecting part 122 will protrude from the inside of the connecting hole. During welding, it is easier to melt the connecting part 122 and connect it to the copper busbar 2 as one unit, avoiding the problem of weak connection due to insufficient welding, improving the welding strength of the copper busbar 2 and the connecting part 122, and ensuring reliable electrical connection between the copper busbar 2 and the connecting part 122.

[0080] Furthermore, in this embodiment, the diameter of the connecting hole is d3, and the value range of d3 is: 0.1mm < d3 - d2 < 0.2mm.

[0081] Verification showed that if the difference between d3 and d2 is not greater than 0.1mm, the connecting part 122 and the connecting hole may not be able to be installed; if the difference between d3 and d2 is not less than 0.2mm, the gap between the connecting part 122 and the connecting hole is too large, which may result in poor welding. In this embodiment, the difference between d3 and d2 is within the above-mentioned range. Specifically, the difference between d3 and d2 can be 0.12mm, 0.14mm, 0.15mm, 0.16mm, 0.18mm, etc., which ensures the smooth installation of the connecting part 122 and the connecting hole while minimizing the possibility of poor welding.

[0082] In this embodiment, when welding the connecting part 122 and the copper busbar 2, the welding power can be 4kw-6kw, and the molten pool depth is required to be ≥2mm to avoid over-melting or incomplete penetration, thereby ensuring the welding reliability of the connecting part 122 and the copper busbar 2 and improving the mechanical properties and service life of the welded joint.

[0083] Please refer to Figure 7 and Figure 8 , Figure 7 for Figure 1Top view of the second connection method between the relay and the copper busbar; Figure 8 for Figure 7 A sectional view along the height direction.

[0084] In some other embodiments, the end face of the connector 122 facing away from the housing 11 is attached to the copper busbar 2.

[0085] As configured above, in this embodiment, the copper busbar 2 does not require drilling, simplifying the forming process of the copper busbar 2; the welding surface of the connecting part 122 and the copper busbar 2 is further away from the housing 11, so less heat generated during welding is transferred to the housing 11 and the internal structure, thereby further reducing the dangerous temperature reached by the housing 11 and the internal structure during the welding process; when welding the copper busbar 2 and the connecting part 122, the distance between the copper busbar 2 and the housing 11 of the relay 1 is greater, forming a larger heat dissipation space between the copper busbar 2 and the housing 11 of the relay 1, which helps to dissipate heat and further reduces the transfer of heat to the housing 11 and its internal structure.

[0086] In this embodiment, the flatness of the mating surfaces of the copper busbar 2 and the connecting part 122 is no greater than 0.1 mm.

[0087] As set above, by limiting the flatness of the mating surfaces of the copper busbar 2 and the connecting part 122, it is ensured that the end face of the connecting part 122 facing away from the housing 11 and the copper busbar 2 can fit more tightly, ensuring the consistency and uniformity of the weld during welding, reducing welding defects such as porosity and slag inclusions, thereby improving the welding reliability of the copper busbar 2 and the connecting part 122, and improving the mechanical properties and service life of the welded joint.

[0088] The flatness of the mating surfaces of the copper busbar 2 and the connecting part 122 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, etc., to achieve a balance between welding reliability and processing accuracy requirements. This ensures the welding reliability of the copper busbar 2 and the connecting part 122, while avoiding the pursuit of extremely high flatness which would lead to increased processing difficulty, increased costs, and reduced production efficiency.

[0089] Furthermore, in this embodiment, the thickness of the copper busbar 2 is T, and the value of T is in the range of 2mm≤T≤3mm.

[0090] Specifically, the value of T can be 2mm, 2.3mm, 2.5mm, 2.7mm, 3mm, etc. Verification has shown that if T is less than 2mm, the thickness of the copper busbar 2 is too thin, the structural strength of the copper busbar 2 cannot meet the requirements, and the copper busbar 2 may break. If T is greater than 3mm, the thickness of the copper busbar 2 is too thick, and laser welding may not be able to penetrate the copper busbar 2, resulting in insufficient welding strength between the copper busbar 2 and the connecting part 122. In this embodiment, the thickness of the copper busbar 2 has the above-mentioned range, which ensures that the structural strength of the copper busbar 2 meets the requirements and that laser welding can penetrate the copper busbar 2, thus ensuring the welding strength between the copper busbar 2 and the connecting part 122 and improving the welding reliability of the copper busbar 2 and the connecting part 122.

[0091] Furthermore, in some embodiments of this application, the battery power distribution unit further includes:

[0092] The control circuit board has a control connection piece and a sampling connection piece. The control terminal 141 of the relay 1 is attached to and electrically connected to the control connection piece, and the sampling terminal 132 of the relay 1 is attached to and electrically connected to the sampling connection piece.

[0093] As configured above, the control circuit board receives sampling signals and controls the operation of relay 1, thereby distributing and controlling the battery output current. The control connector is electrically connected to the control terminal 141 of relay 1. When the control circuit board needs to control relay 1, it can send a signal to the control terminal 141 of relay 1 through the control connector. The sampling connector is electrically connected to the sampling terminal 132 of relay 1. The sampling connector is used to acquire the operating status information of relay 1, enabling real-time monitoring of the battery power distribution status. Furthermore, the direct connection between the control terminal 141 and the control connector, and the direct connection between the sampling terminal 132 and the sampling connector, improves the integration of relay 1 and the control circuit board, reduces the use of wiring harnesses, and lowers the risk of system failure.

[0094] In some embodiments of this application, the control terminal 141 and the control connecting piece are welded to achieve electrical connection, which helps to improve the connection reliability of the control terminal 141 and the control connecting piece and reduce contact resistance. In other embodiments of this application, the control terminal 141 and the control connecting piece are snap-fitted to achieve electrical connection, making installation and maintenance more convenient.

[0095] In some embodiments of this application, the sampling terminal 132 and the sampling connecting piece are welded to achieve electrical connection, which helps to improve the connection reliability of the sampling terminal 132 and the sampling connecting piece and reduce contact resistance. In other embodiments of this application, the sampling terminal 132 and the sampling connecting piece are snap-fitted to achieve electrical connection, making installation and maintenance more convenient.

[0096] This embodiment also provides a vehicle including the aforementioned battery power distribution unit.

[0097] The vehicle in this embodiment includes the aforementioned battery power distribution unit, and therefore has the same technical effects as the aforementioned battery power distribution unit, which will not be repeated here.

[0098] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A relay, characterized in that, include: Shell (11); The contact (12) includes a main body (121) and a connecting part (122) for connecting with the copper busbar (2). Part of the main body (121) is exposed outside the housing (11). The connecting part (122) is connected to the end of the main body (121) away from the housing (11). In the extending direction of the contact (12), the length of the part of the main body (121) exposed outside the housing (11) is d1, and the value range of d1 is: d1 > 2 mm.

2. The relay according to claim 1, characterized in that, The lateral width of the connecting part (122) is d2, and the value range of d2 is: d2≥7mm.

3. The relay according to claim 1 or 2, characterized in that, The relay (1) further includes: The sampling component (13) is partially installed inside the housing (11). One end of the sampling component (13) has a contact connection portion (131), which is an arc-shaped structure that matches the peripheral wall of the main body (121). The contact connection portion (131) and the contact (12) are electrically connected. The other end of the sampling component (13) has a sampling terminal (132), which extends from the wall of the housing (11) away from the contact (12).

4. The relay according to claim 3, characterized in that, The sampling component (13) further includes a first connecting segment (133), a second connecting segment (134), a third connecting segment (135), and a fourth connecting segment (136) connected in sequence. The first connecting segment (133) is connected to the contact connection portion (131), and the fourth connecting segment (136) is connected to the sampling terminal (132). The first connecting segment (133) extends along a first direction, the second connecting segment (134) and the fourth connecting segment (136) extend along a second direction, and the third connecting segment (135) extends along the third direction. Wherein, the extension direction of the contact (12) is the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

5. The relay according to claim 1 or 2, characterized in that, The relay (1) further includes: The electromagnetic assembly (14) includes a lead frame connected to a control terminal (141) which extends from the wall of the housing (11) away from the contact (12).

6. A battery power distribution unit, characterized in that, include: The relay according to any one of claims 1-5; The copper busbar (2) and the connecting part (122) are welded and fixed.

7. The battery power distribution unit according to claim 6, characterized in that, A stepped surface (12A) facing away from the housing (11) is formed between the connecting part (122) and the main body part (121). The copper busbar (2) has a connecting hole, through which the connecting part (122) passes. The copper busbar (2) abuts against the side wall of the housing (11) and the stepped surface (12A).

8. The battery power distribution unit according to claim 7, characterized in that, The thickness of the copper busbar (2) is T, and the height of the connecting part (122) is H. The value range of H is: H > T + 0.2 mm.

9. The battery power distribution unit according to claim 7, characterized in that, The diameter of the connecting part (122) is d2, and the diameter of the connecting hole is d3. The value range of d3 is: 0.1mm < d3 - d2 < 0.2mm.

10. The battery power distribution unit according to claim 6, characterized in that, The end face of the connecting part (122) facing away from the housing (11) is attached to the copper busbar (2).

11. The battery power distribution unit according to claim 10, characterized in that, The flatness of the mating surfaces of the copper busbar (2) and the connecting part (122) is no greater than 0.1 mm.

12. The battery power distribution unit according to claim 10, characterized in that, The thickness of the copper busbar (2) is T, and the value of T is in the range of 2mm≤T≤3mm.

13. The battery power distribution unit according to any one of claims 6-12, characterized in that, The battery power distribution unit also includes: The control circuit board has a control connection piece and a sampling connection piece. The control terminal (141) of the relay (1) is attached to and electrically connected to the control connection piece, and the sampling terminal (132) of the relay (1) is attached to and electrically connected to the sampling connection piece.

14. The battery power distribution unit according to claim 13, characterized in that, The control terminal (141) and the control connecting piece are welded or snapped together to achieve electrical connection; the sampling terminal (132) and the sampling connecting piece are welded or snapped together to achieve electrical connection.

15. A vehicle, characterized in that, Includes the battery power distribution unit as described in any one of claims 6-14.

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