Circuit interrupting element, circuit connecting assembly and BDU

Abstract

The utility model relates to battery pack electrical element technical field and provide a kind of circuit on-off element, circuit connection assembly and BDU.The circuit on-off element includes shell and fixed static contact on shell;Static contact can selectively contact or separate with moving contact in shell, and static contact includes connecting copper column and connecting aluminum ring;Connecting copper column has exposed part that part exposes shell outside, connecting aluminum ring is sleeved on exposed part, and is fixedly connected with exposed part, and the outer end surface of exposed part forms first connecting end surface, and threaded connection part is equipped on first connecting end surface, and the outer end surface of connecting aluminum ring forms second connecting end surface.The utility model discloses circuit on-off element, by optimizing the structure of static contact, it is favorable to reduce contact resistance, and it is favorable to improve the compatibility of circuit on-off element use, to improve the versatility of circuit connection assembly.

Description

Technical Field

[0001] This utility model relates to the field of battery pack electrical components technology, and particularly to a circuit switching element. This utility model also relates to a circuit connection assembly having the aforementioned circuit switching element. Furthermore, this utility model also relates to a BDU having the aforementioned circuit connection assembly. Background Technology

[0002] The three core components of new energy electric vehicles are the battery, motor, and electronic control system. Among these, the control of the battery pack's energy output and charging circuits typically requires circuit switching elements, and the industry commonly uses a Battery Distribution Unit (BDU) to achieve this. A typical battery distribution unit includes a main positive contactor, a main negative contactor, a pre-charge contactor, a pre-charge resistor, a fuse, a current sensor, high and low voltage connectors, and related connecting busbars.

[0003] Taking contactors as an example, existing high-voltage contactors are typically bolted to external busbars, resulting in high contact resistance. Under high current, this leads to significant heat generation and temperature rise, reducing the contactor's current-carrying capacity. This necessitates the use of contactors with higher current-carrying capacities, increasing contactor costs. Furthermore, higher current-carrying capacities require larger contactor sizes, hindering BDU miniaturization and impacting battery pack capacity. Moreover, when aluminum busbars are used, the copper-based stationary contacts in current contactors cannot guarantee a reliable connection with the aluminum busbars, leading to incompatibility between the contactors and aluminum busbars. Utility Model Content

[0004] In view of this, the present invention aims to provide a circuit switching element to reduce contact resistance and improve its compatibility in use.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A circuit switching element includes a housing and a stationary contact fixed to the housing;

[0007] The stationary contact can selectively contact or separate from the moving contact inside the housing, and the stationary contact includes a connecting copper pillar and a connecting aluminum ring;

[0008] The connecting copper pillar has an exposed portion that partially protrudes from the outside of the housing. The connecting aluminum ring is sleeved on the exposed portion and fixedly connected to it. The outer end face of the exposed portion forms a first connecting end face. The first connecting end face is provided with a threaded connection portion. The outer end face of the connecting aluminum ring forms a second connecting end face.

[0009] Furthermore, the first connecting end face is flush with the second connecting end face; and / or, the threaded connection portion includes a threaded hole formed on the first connecting end face.

[0010] Furthermore, the connecting aluminum ring is a circular ring or a rectangular ring; and / or, the connecting aluminum ring is welded to the exposed portion.

[0011] Furthermore, the circuit switching element includes one of a contactor, circuit breaker, relay, fuse, or shunt.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] The circuit switching element of this utility model includes a stationary contact comprising a connecting copper pillar and a connecting aluminum ring. The connecting aluminum ring is sleeved and fixed to the exposed part of the connecting copper pillar, and the outer end face of the exposed part forms a first connecting end face. A threaded connection part is formed on the first connecting end face, and the outer end face of the connecting aluminum ring forms a second connecting end face. This structure can realize the screw connection between the external conductive component, i.e., the external conductive bus, and the stationary contact, or the weld connection between the external conductive bus and the stationary contact, or the connection between the external conductive bus and the stationary contact by first screwing and then welding. Moreover, when using the welding connection, compared with the screw connection, it can help reduce the contact resistance.

[0014] At the same time, the first connecting end face allows the copper external conductive bus to be electrically connected to the stationary contact, and the second connecting end face allows the aluminum external conductive bus to be electrically connected to the stationary contact. Furthermore, the arrangement of the first and second connecting end faces can also realize the electrical connection between the copper-aluminum composite conductive bus and the stationary contact. This is beneficial for improving the compatibility of circuit switching components and has a good performance.

[0015] Furthermore, setting the first and second connecting end faces flush not only ensures the consistency of the stationary contact structure but also simplifies the structure of the external conductive busbar and facilitates its fabrication. The threaded connection uses a threaded hole, which is simpler in structure than using a stud, facilitating the fabrication of the stationary contact and reducing its weight.

[0016] Furthermore, the connecting aluminum ring is made of either a circular or rectangular ring, which facilitates processing and increases the connection area between the connecting aluminum ring and the connecting copper pillar. Welding the connecting aluminum ring to the exposed portion ensures the reliability and stability of the connection between the connecting aluminum ring and the connecting copper pillar.

[0017] Another objective of this invention is to provide a circuit connection assembly, including an external conductive component and a circuit switching element as described above, wherein the external conductive component is electrically connected to the stationary contact in the circuit switching element.

[0018] Furthermore, the external conductive component includes at least one of copper busbar, aluminum busbar, and copper-aluminum composite busbar.

[0019] Furthermore, the external conductive component is screwed onto the connecting copper pillar in the stationary contact, and the end of the external conductive component that contacts the stationary contact is provided with a nickel layer.

[0020] Furthermore, the external conductive component is welded to the stationary contact.

[0021] Furthermore, the external conductive component is a copper-aluminum composite busbar, which is provided with a pre-fixing hole and a welding groove; the pre-fixing hole is screwed into the threaded connection part for fixation; the welding groove is used to weld the copper layer on the copper-aluminum composite busbar to the outer end face of the exposed part, or the welding groove is used to weld the aluminum layer on the copper-aluminum composite busbar to the outer end face of the connecting aluminum ring.

[0022] The circuit connection assembly described in this utility model, by employing the aforementioned circuit switching elements, helps to reduce contact resistance and improve the compatibility of the circuit switching elements, thereby enhancing the versatility of the circuit connection assembly.

[0023] Furthermore, the external conductive component can be set as a copper busbar, aluminum busbar, or copper-aluminum composite busbar, making the range of applicable external conductive components for circuit switching elements wide. When the external conductive component is screwed onto the connecting copper post of the stationary contact, a nickel layer is provided at one end of the external conductive component. This can prevent electrochemical corrosion between the external conductive component and the stationary contact. Moreover, the wear resistance and high hardness of the nickel layer ensure a high degree of flatness at the connection end of the external conductive component, resulting in a good fit with the stationary contact and reducing contact resistance.

[0024] Furthermore, welding the external conductive component to the stationary contact not only ensures the reliability and stability of the external conductive component connection but also helps reduce contact resistance. The external conductive component is a copper-aluminum composite busbar. Pre-fixing holes and welding grooves are provided on the copper-aluminum composite busbar. Bolts or other fasteners inserted into the pre-fixing holes can be used to pre-fix the copper-aluminum composite busbar to the stationary contact. Then, the copper-aluminum composite busbar and the stationary contact are welded together in the welding groove. This achieves both pre-fixation of the copper-aluminum composite busbar and ensures welding quality, further improving the reliability and stability of the external conductive component connection and enhancing overall reliability in use.

[0025] Another objective of this invention is to provide a BDU, wherein the BDU is provided with the circuit connection components described above.

[0026] The BDU of this invention, by adopting the above-mentioned circuit connection components, helps to reduce contact resistance, improves the compatibility of circuit switching components, and facilitates the miniaturization design of the BDU, thus having excellent usability. Attached Figure Description

[0027] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0028] Figure 1 This is a schematic diagram of the circuit switching element described in an embodiment of the present invention;

[0029] Figure 2 This is a first-view structural schematic diagram of the stationary contact described in an embodiment of the present invention;

[0030] Figure 3 This is a structural schematic diagram of the stationary contact described in an embodiment of the present invention from a second perspective;

[0031] Figure 4 This is a third-view structural schematic diagram of the stationary contact described in an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the circuit connection assembly described in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the first structure of the external conductive component described in this embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of a second structure of the external conductive component described in an embodiment of the present invention;

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Housing; 2. Stationary contact; 3. Copper busbar; 4. Copper-aluminum composite busbar; 5. Bolts;

[0037] 20. Weld seam; 21. Connecting copper column; 22. Connecting aluminum ring; 210. Threaded connection; 30. Connecting hole; 31. Nickel sheet; 40. Pre-fixing hole; 41. Copper layer; 42. Aluminum layer; 410. Welding groove. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0039] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0040] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0042] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Example 1

[0044] This embodiment relates to a circuit switching element that helps reduce contact resistance and improves compatibility in its use.

[0045] In terms of overall structure, refer to Figures 1 to 4 As shown, the circuit switching element in this embodiment includes a housing 1 and a stationary contact 2 fixed on the housing 1. The stationary contact 2 can selectively contact or separate from the moving contact inside the housing 1. The stationary contact 2 includes a connecting copper post 21 and a connecting aluminum ring 22. The connecting copper post 21 has an exposed portion that partially protrudes outside the housing 1. The connecting aluminum ring 22 is sleeved on the exposed portion and fixedly connected to it. The outer end face of the exposed portion forms a first connecting end face, and a threaded connection portion 210 is provided on the first connecting end face. The outer end face of the connecting aluminum ring 22 forms a second connecting end face.

[0046] In the above structure, by setting the stationary contact 2 to use a connecting copper pillar 21 and a connecting aluminum ring 22, the connecting aluminum ring 22 is sleeved and fixed to the exposed part of the connecting copper pillar 21, and a first connecting end face is formed on the outer end face of the exposed part. A threaded connection part 210 is formed on the first connecting end face, and a second connecting end face is formed on the outer end face of the connecting aluminum ring 22. This structure can realize the screw connection between the external conductive component, i.e., the external conductive bus, and the stationary contact 2, or the weld connection between the external conductive bus and the stationary contact 2, or the connection between the external conductive bus and the stationary contact 2 by first screwing and then welding. Moreover, when using the welding connection, compared with the screw connection, the contact resistance can be reduced.

[0047] Meanwhile, the first connecting end face allows the external conductive busbar to be electrically connected to the stationary contact 2, and the second connecting end face allows the aluminum external conductive busbar to be electrically connected to the stationary contact 2. Furthermore, the arrangement of the first and second connecting end faces can also enable the copper-aluminum composite conductive busbar to be electrically connected to the stationary contact 2. This facilitates the improvement of the compatibility of circuit switching components and has a wide range of applications.

[0048] Based on the above overview, in detail, in this embodiment, it should be noted that the circuit switching element includes one of a contactor, circuit breaker, relay, fuse, or shunt. That is, the circuit switching element in this embodiment can be a contactor, a circuit breaker, a relay, a fuse, or a shunt. The stationary contact 2 of these circuit switching elements can all adopt a structure of connecting copper pillar 21 and a connecting aluminum ring 22 fixedly attached to the exposed part of the connecting copper pillar 21, which can improve compatibility in use.

[0049] It should also be noted that, based on the fact that the material of the external conductive component is aluminum or copper conductive busbar, and the material of the stationary contact 2 and the moving contact of the circuit switching element itself is usually copper, the structure of the stationary contact 2 in this embodiment adopts a matching structure of connecting copper pillar 21 and connecting aluminum ring 22. The connecting copper pillar 21 can adopt the existing structure, so that the aluminum ring 22 is fixed on the existing structure, which makes the modification of the circuit switching element small and the manufacturing cost low.

[0050] This embodiment uses the structure of a contactor as an example for detailed explanation, still referring to... Figure 1 and combined Figure 4As shown, the contactor mainly includes a housing 1, a moving contact movably disposed within the housing 1, and two stationary contacts 2 fixed to the housing 1. The moving contact and its related structures can be referenced from existing technologies. In practical use, when energized, the moving contact moves towards and contacts the two stationary contacts 2, closing the contact circuit between them. When de-energized, the moving contact resets and separates from the two stationary contacts 2, breaking the contact circuit between them.

[0051] Continue to refer to Figures 1 to 4 As shown, in this embodiment, the stationary contact 2 includes a connecting copper pillar 21 and a connecting aluminum ring 22. The connecting copper pillar 21 has an exposed portion partially protruding from the exterior of the housing 1. The connecting aluminum ring 22 is fitted onto the exposed portion and fixedly connected to it. The outer end face of the exposed portion forms a first connecting end face, and a threaded connecting portion 210 is provided on the first connecting end face. This first connecting end face allows the copper external connector to be welded to the stationary contact 2, screwed together, or connected using a combination of screwing and welding.

[0052] In a preferred embodiment, the first connecting end face formed on the outer end face of the exposed portion and the second connecting end face formed on the outer end face of the connecting aluminum ring 22 are flush. This not only helps to ensure the consistency of the stationary contact 2 structure, but also simplifies the structure of the external conductive busbar and facilitates the processing and fabrication of the external conductive busbar.

[0053] It is understandable that the first and second connecting end faces may not be flush. In this case, the corresponding settings of the external connector matching structure are required for different connecting parts.

[0054] Similarly, as a preferred implementation method, such as Figure 1 and Figure 4 As shown, the threaded connection portion 210 in this embodiment preferably includes a threaded hole formed on the first connection end face. Compared with a structure using a stud, this structure is simpler, facilitates the processing and fabrication of the stationary contact 2, and also helps to reduce the weight of the stationary contact 2.

[0055] In this embodiment, preferably, the connecting aluminum ring 22 is a circular or rectangular ring, which is easy to process and manufacture, and helps to increase the connection area between the connecting aluminum ring 22 and the connecting copper pillar 21. Also preferably, the connecting aluminum ring is welded to the exposed part. In specific implementation, the bottom of the connecting aluminum ring and the bottom of the exposed part are brazed or laser welded, that is, a weld 20 is formed at the bottom of the connecting aluminum ring and the bottom of the exposed part. Welding at this position helps to ensure the flatness of the first connecting end face and the second connecting end face. Furthermore, as a further step, the connecting aluminum ring 22 is a circular ring, which facilitates welding and, compared with other shapes, also helps to reduce weight.

[0056] In specific implementation, the inner diameter of the connecting aluminum ring 22 is matched with the outer diameter of the exposed part. The inner diameter of the connecting aluminum ring 22 is preferably set between 15-17 mm, for example, 15 mm, 16 mm, or 17 mm. The outer diameter of the connecting aluminum ring 22 is preferably set between 25-30 mm, for example, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, or 30 mm. The thickness of the connecting aluminum ring 22 is preferably set between 3-5 mm, for example, 3 mm, 4 mm, or 5 mm.

[0057] Also preferred is that the connecting aluminum ring is welded to the exposed part.

[0058] In this embodiment, the circuit switching element can be used to screw or weld copper busbar 3, aluminum busbar 3, and copper-aluminum composite busbar 4, as described in Embodiment 2 below. This circuit switching element not only reduces contact resistance but also improves compatibility, exhibiting good versatility.

[0059] Example 2

[0060] This embodiment relates to a circuit connection component, such as... Figure 5 As shown, the circuit connection assembly includes an external conductive component and a circuit switching element of Embodiment 1, and the external conductive component is electrically connected to the stationary contact 2 in the circuit switching element.

[0061] Specifically, as a preferred embodiment, the external conductive component of this embodiment includes at least one of a copper busbar 3, an aluminum busbar, and a copper-aluminum composite busbar 4. That is, the external conductive component can be a copper busbar 3, an aluminum busbar, or a copper-aluminum composite busbar 4. It is worth noting that the copper-aluminum composite busbar 4 adopts a structure in the prior art, which has a copper layer 41 and an aluminum layer 42 stacked and fixed together.

[0062] In one preferred embodiment, the external conductive component is screwed onto the connecting copper post 21 in the stationary contact 2, and a nickel layer is provided at the end of the external conductive component that contacts the stationary contact 2. In this case, the external conductive component is screwed onto the stationary contact 2, which is compatible with traditional connection methods. Furthermore, in specific implementations, a nickel layer is provided at the end of the external conductive component that contacts the stationary contact 2. This prevents electrochemical corrosion between the external conductive component and the stationary contact 2. The high wear resistance and hardness of the nickel layer also ensure a high degree of flatness at the connection end of the external conductive component, resulting in a good fit with the stationary contact 2 and reducing contact resistance.

[0063] To facilitate the installation of external conductive components without distinguishing between the top and bottom surfaces, in this embodiment, a nickel layer is further provided on both the top and bottom surfaces of one end of the external conductive component. In practice, nickel plating can be performed on one end of the external conductive component. Alternatively, a patch method can be used, where nickel sheets 31 are attached to both the top and bottom surfaces of one end of the external conductive component, allowing the nickel sheets 31 to be heat-pressed together with the external conductive component.

[0064] In this embodiment, the external conductive component is screwed onto the stationary contact 2, and / or the external conductive component is welded onto the stationary contact 2. That is, the external conductive component can be connected to the stationary contact 2 by screwing, by welding, or by a combination of screwing and welding.

[0065] When using a screw connection, specifically, as follows: Figure 5 and Figure 6 Taking the copper busbar 3 shown as an example, the end of the copper busbar 3 connected to the stationary contact 2 has nickel plates 31 on both its upper and lower surfaces, and the copper busbar 3 also has connecting holes 30 corresponding to the threaded connection part 210. At this time, the copper busbar 3 is screwed and fixed to the connecting copper column 21 by bolts 5 passing through the connecting holes 30.

[0066] Understandably, when an aluminum busbar is used for the electrical connector, its structure is the same as that of the copper busbar 3 described above. Nickel plates 31 are also provided on the upper and lower surfaces of the ends of the aluminum busbar, and a connection hole 30 corresponding to the threaded connection portion 210 is also provided on the aluminum busbar. Similarly, when a copper-aluminum composite busbar 4 is used for the electrical connector, it also has nickel plates 31 and connection holes 30. This allows for the screw connection between the aluminum busbar and the copper-aluminum composite busbar 4 and the connecting copper post 21.

[0067] When welding is used for connection, for example, if the external conductive component is a copper busbar 3, welding can be performed at the contact point between the copper busbar 3 and the connecting copper post 21. If the external conductive component is an aluminum busbar, welding can be performed at the contact point between the aluminum busbar and the connecting aluminum ring 22. If the external connector is a copper-aluminum composite busbar 4, since the copper-aluminum composite busbar 4 has a copper layer 41 and an aluminum layer 42, corresponding structural arrangements are needed to achieve welding of the aluminum layer 42 to the connecting aluminum ring 22, or to connect the copper layer 41 to the connecting copper post 21.

[0068] In detail, refer to Figure 5 and Figure 7 As shown, a welding groove 410 needs to be provided on the copper-aluminum composite busbar 4. The welding groove 410 is used to weld the copper layer 41 on the copper-aluminum composite busbar 4 to the outer end face of the exposed part, or the welding groove 410 is used to weld the aluminum layer 42 on the copper-aluminum composite busbar 4 to the outer end face of the connecting aluminum ring 22.

[0069] like Figure 5 and Figure 7 As shown in the illustration, this embodiment uses the example of an aluminum layer 42 at the bottom and a copper layer 41 at the top in a copper-aluminum composite busbar 4. In this case, a welding groove 410 is formed on the copper layer 41, and the depth of the welding groove 410 is consistent with the thickness of the copper layer 41, exposing the lower aluminum layer 42. Furthermore, the inner diameter of the welding groove 410 should be equal to or greater than the outer diameter of the exposed portion of the connecting copper column 21. That is, the projection of the welding groove 410 onto the outer end face of the stationary contact 2 is located in the area where the connecting aluminum ring 22 is situated. At this point, laser welding is performed at the location of the welding groove 410, causing the aluminum layer 42 in the copper-aluminum composite busbar 4 to be welded and fixed to the connecting aluminum ring 22, thus achieving a welded connection between the copper-aluminum composite busbar 4 and the stationary contact 2.

[0070] Understandably, when the aluminum layer 42 is on top and the copper layer 41 is below in the copper-aluminum composite busbar 4, the welding groove 410 is formed on the aluminum layer 42, and the depth of the welding groove 410 is consistent with the thickness of the aluminum layer 42, thus exposing the lower copper layer 41. It should be noted that the projection of the welding groove 410 on the outer end face of the stationary contact 2 is located in the area where the connecting copper pillar 21 is located. Thus, by performing laser welding at the location of the welding groove 410, the copper layer 41 in the copper-aluminum composite busbar 4 is welded and fixed to the connecting copper pillar 21, thereby achieving the welded connection between the copper-aluminum composite busbar 4 and the stationary contact 2.

[0071] To ensure the welding quality of the copper-aluminum composite busbar 4, in this embodiment, as a preferred method, is... Figure 5 and Figure 7As shown, a pre-fixing hole 40 is also provided on the copper-aluminum composite busbar 4. The pre-fixing hole 40 is screwed into the threaded connection part 210 for fixation. In specific implementation, the copper-aluminum composite busbar 4 is pre-fixed to the connecting copper column 21 by bolts 5 passing through the pre-fixing hole 40 and screwed into the threaded connection part 210. Then, the copper-aluminum composite busbar 4 and the stationary contact 2 are welded together in the welding groove 410.

[0072] This configuration serves two purposes: firstly, it allows for the pre-fixation of the copper-aluminum composite busbar 4, ensuring its relative position; secondly, it guarantees a complete weld between the lower aluminum layer 42 and the connecting aluminum ring 22, preventing issues such as incomplete or poor welding, thus ensuring welding quality and further improving the reliability and stability of the external conductive component connection, thereby enhancing overall reliability. Furthermore, the use of screw connections and laser welding minimizes contact resistance, significantly reducing heat generation at the contactor output terminals and limiting the occurrence of maximum overcurrent.

[0073] It is worth mentioning that, in order to improve the reliability and stability of the welding quality of the busbar, in this embodiment, the thickness of the aluminum layer 42 is preferably ≤2mm, and the thickness of the upper copper layer 41 is matched according to the magnitude of the busbar's overcurrent. For example, if the busbar needs to carry a current of 400A, and the lower aluminum layer 42 is 2mm thick and 30mm wide, and the current carrying capacity of the aluminum layer 42 is usually 3A / mm2, then the maximum overcurrent of the lower aluminum layer 42 is 3*2*30=180(A). The current carrying capacity of the copper layer 41 is usually 5A / mm2, then the minimum required thickness of the copper layer 41 is: (400-180) / (30*5)=1.47mm. In this case, the thickness of the copper layer 41 is preferably 1.5mm.

[0074] It is also worth mentioning that when the external electrical connector is a copper busbar 3 or an aluminum busbar, it can also be connected to the stationary contact 2 by means of screwing and welding. The specific settings are made according to the actual usage requirements.

[0075] The circuit connection assembly of this embodiment, by employing the aforementioned circuit switching elements, helps to reduce contact resistance and improve the compatibility of the circuit switching elements, thereby enhancing the versatility of the circuit connection assembly.

[0076] Example 3

[0077] This embodiment relates to a BDU, which includes the circuit connection components described in Embodiment 2.

[0078] It should be noted that a BDU (Battery Distribution Unit) typically contains contactors, circuit breakers, relays, fuses, shunts, and other electrical components and connections.

[0079] At this point, the BDU of this embodiment, by adopting the circuit connection components of embodiment two, not only benefits the contact resistance of the battery and improves the compatibility of the circuit switching components, but also facilitates the miniaturization design of the BDU, thereby improving the battery pack's capacity.

[0080] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A circuit switching element, characterized in that: Includes a housing and a stationary contact fixed to the housing; The stationary contact can selectively contact or separate from the moving contact inside the housing, and the stationary contact includes a connecting copper pillar and a connecting aluminum ring; The connecting copper pillar has an exposed portion that partially protrudes from the outside of the housing. The connecting aluminum ring is sleeved on the exposed portion and fixedly connected to it. The outer end face of the exposed portion forms a first connecting end face. The first connecting end face is provided with a threaded connection portion. The outer end face of the connecting aluminum ring forms a second connecting end face.

2. The circuit switching element according to claim 1, characterized in that: The first connecting end face is flush with the second connecting end face; And / or, the threaded connection includes a threaded hole formed on the first connection end face.

3. The circuit switching element according to claim 1, characterized in that: The connecting aluminum ring is a circular ring or a rectangular ring; and / or... The connecting aluminum ring is welded to the exposed part.

4. The circuit switching element according to any one of claims 1 to 3, characterized in that: The circuit switching element includes one of a contactor, circuit breaker, relay, fuse, or shunt.

5. A circuit connection component, characterized in that: It includes an external conductive component and a circuit switching element as described in any one of claims 1 to 4, wherein the external conductive component is electrically connected to the stationary contact in the circuit switching element.

6. The circuit connection assembly according to claim 5, characterized in that: The external conductive component includes at least one of copper busbar, aluminum busbar, and copper-aluminum composite busbar.

7. The circuit connection assembly according to claim 6, characterized in that: The external conductive component is screwed onto the connecting copper pillar in the stationary contact, and the end of the external conductive component that contacts the stationary contact is provided with a nickel layer.

8. The circuit connection assembly according to claim 6, characterized in that: The external conductive component is welded to the stationary contact.

9. The circuit connection assembly according to claim 8, characterized in that: The external conductive component is a copper-aluminum composite busbar, which is provided with pre-fixing holes and welding grooves. The pre-fixed hole is screwed into the threaded connection part for fixation; The welding groove is used to weld the copper layer on the copper-aluminum composite busbar to the outer end face of the exposed part, or the welding groove is used to weld the aluminum layer on the copper-aluminum composite busbar to the outer end face of the connecting aluminum ring.

10. A BDU, characterized in that: The BDU includes the circuit connection component as described in any one of claims 5 to 9.

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