Electrical apparatus

Abstract

The utility model discloses an electrical equipment relates to electrical equipment technical field, wherein, electrical equipment, including contactor and conducting bar, the one end of conducting bar is with contactor contact point electricity connection, and is equipped with plating between the electricity connection of both, in at least one of contactor and conducting bar, the resistivity of plating is less than the resistivity of conducting bar and the resistivity of contact point, the utility model provides technical scheme can reduce the contact resistance of the lap joint surface of contactor contact point and conducting bar, and then reduce the temperature of contact point in the process of electrification, and then can prolong the service life of contactor and conducting bar.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to an electrical device. Background Technology

[0002] Currently, the PDU (Power Distribution Unit) in automotive electrical systems is connected to an external power source or load via contactors. The PDU distributes power through built-in contactors (such as main positive and negative contactors) and supports time-sharing connection of different loads according to control signals.

[0003] When existing contactors are used in conjunction with PDUs to distribute power, the contactor contacts suffer from high temperatures and difficulty in heat dissipation, which leads to a sharp reduction in the contactor's service life. Utility Model Content

[0004] The main purpose of this invention is to propose an electrical device that aims to solve the problems of high temperature and difficulty in heat dissipation at the contact points of existing contactors.

[0005] To achieve the above objectives, this utility model proposes an electrical device comprising: Contactor; A conductive busbar, one end of which is electrically connected to the contactor's contact, and at the electrical connection point between the two, at least one of the contactor and the conductive busbar is provided with a plating layer, the resistivity of which is less than the resistivity of the conductive busbar and the resistivity of the contact.

[0006] In one embodiment, the conductive bus includes a first end, a second end, and a connecting segment for connecting the first end and the second end, and the plating is provided on the surface of the first end facing the contact of the contactor; And / or, the first end and the second end are respectively provided with fixing holes, and the first end is detachably connected to the contactor by bolts.

[0007] In one embodiment, the coating is provided on the side surface of the contactor facing the conductive busbar.

[0008] In one embodiment, the electrical device further includes a heat sink and a thermally conductive medium configured to thermally connect the contacts of the contactor and / or the conductive busbar to the heat sink.

[0009] In one embodiment, the heat sink is the housing of the electrical device.

[0010] In one embodiment, the housing includes a housing body and a cover, the housing body having a mounting groove, the cover covering the opening of the mounting groove to form a mounting cavity, the contactor being mounted in the mounting cavity, and the heat-conducting medium being disposed between the contacts of the contactor and / or the conductive bar and the cover.

[0011] In one embodiment, the thermally conductive medium is installed at the contact point of the contactor and / or on the conductive bar, and when the cover is closed on the shell body, one end of the thermally conductive medium away from the contact point of the contactor and / or the conductive bar abuts against the cover. Alternatively, the thermally conductive medium is disposed on the surface of the cover facing the contact point of the contactor and / or the conductive bar, and when the cover is closed on the shell body, the end of the thermally conductive medium away from the cover abuts against the contact point of the contactor and / or the conductive bar.

[0012] In one embodiment, the contactor has a plurality of contacts; The thermally conductive medium includes a thermally conductive body and a plurality of bonding portions. The plurality of bonding portions are disposed on the side surface of the thermally conductive body facing the contactor, and each bonding portion corresponds to each contact point. Alternatively, the contactor may have multiple contacts; the number of thermally conductive media is the same as the number of contacts, and each thermally conductive medium corresponds one-to-one with each contact.

[0013] In one embodiment, the thermally conductive medium includes at least one of a thermally conductive silicone pad, a thermally conductive gel, or a blue adhesive.

[0014] In one embodiment, the conductive busbar is a copper busbar or an aluminum busbar; the plating material is gold or silver.

[0015] The technical solution of this utility model has two aspects. First, a coating is provided on the overlapping surface of the contactor, contacts, and conductive busbar. The resistivity of the coating is less than that of the conductive busbar and the contacts, which can reduce the contact impedance of the overlapping surface and reduce the heat generated by the contacts. Second, the heat generated by the contacts of the contactor is conducted to the heat dissipation component through the heat-conducting medium and dissipated to the external environment through the heat dissipation component, thereby further realizing the efficient heat dissipation of the contactor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the electrical equipment provided by this utility model; Figure 2 for Figure 1 A schematic diagram of the disassembled structure of the electrical equipment after removing the casing; Figure 3 for Figure 1 A schematic diagram of the disassembled structure of an embodiment of the overall electrical equipment; Figure 4 for Figure 1 A schematic diagram of the disassembled structure of another embodiment of the electrical equipment.

[0018] Explanation of icon numbers: 1. Electrical equipment; 10. Heat sink; 11. Housing body; 11a. Mounting groove; 12. Cover; 21. Contactor; 21a. Contact; 22. Conductive busbar; 221. First end; 222. Connecting section; 223. Second end; 224. Fixing hole; 221a. Plating; 23. Bolt; 30. Thermal medium; 31. Thermal body; 32. Adhesive part.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

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

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] Currently, the PDU (Power Distribution Unit) in automotive electrical systems is connected to an external power source or load via contactors. The PDU distributes power through built-in contactors (such as main positive and negative contactors) and supports time-sharing connection of different loads according to control signals.

[0024] When existing contactors are used in conjunction with PDUs to distribute power, the contactor contacts do not have any heat dissipation measures. As a result, after a long period of time, the contactor contacts are prone to high temperatures and difficulty in heat dissipation, which will indirectly lead to a sharp reduction in the service life of the contactor.

[0025] This utility model proposes an electrical device, which can be an on-board charger for new energy vehicles, used for distributing and converting the power of new energy vehicles.

[0026] In one embodiment, at the contact 21a of the contactor 21 at one end of the conductive bus 22, at the connection between the two, at least one of the conductive bus 22 and the contact 21a of the contactor 21 is provided with a plating layer 221a. For example, as... Figures 2 to 3 As shown, the conductive busbar 22 is detachably installed at the contact 21a of the contactor 21. The detachable method can be screwed or glued with conductive adhesive. No further restrictions are imposed on this.

[0027] In order to reduce the impedance of the overlapping surface between the conductive busbar 22 and the contact 21a, in this embodiment, a plating layer 221a with a resistivity lower than that of the conductive busbar and the contact is provided on the overlapping surface where the conductive busbar 22 and the contact 21a are connected. This plating layer 221a can be a gold layer or a silver layer, and there are no further restrictions on this.

[0028] In this embodiment, by providing a plating layer 221a on the overlapping surface of at least one of the conductive busbar 22 and the contact 21a, the impedance can be effectively reduced, that is, the resistivity can be reduced, thereby reducing heat generation (by optimizing the charge transport path of the conductive busbar and systematically reducing the impedance of its conductive circuit, power loss is fundamentally reduced, thereby suppressing temperature rise). It also better protects the electrical equipment 1, reduces the cross-sectional area of ​​the conductive busbar 22, and lowers costs. It is understood that the conductive busbar 22 can be a copper busbar, an aluminum busbar, etc., and no further limitations are imposed.

[0029] In the embodiments of this utility model, the plating layer 221a can be disposed on the conductive busbar 22, or on the contact 21a, or simultaneously on the conductive busbar 22 and the contact 21a. Regarding the specific location of the plating layer 221a, it can be plated on the entire outer surface of the conductive busbar 22, or only on the surface of the conductive busbar 22 corresponding to the contact 21a. It can also be plated on the entire contact 21a, or only on the surface of the contact 21a opposite to the conductive busbar 22. No further limitations are imposed on this.

[0030] In one embodiment, the conductive bus 22 includes a first end 221, a second end 223, and a connecting section 222 for connecting the first end 221 and the second end 223. A plating layer 221a is provided on the surface of the first end 221 facing the contact 21a of the contactor 21. The first end 221 and the second end 223 are respectively provided with fixing holes 224. The first end 221 is detachably connected to the contactor 21 by bolts 23. For example, Figure 2 As shown, in this embodiment, the conductive bus 22 includes a first end 221, a second end 223, and a connecting segment 222 connecting the two. The first end 221 and the second end 223 may be located on different horizontal planes or on the same horizontal plane. This can be designed according to the actual situation without too much limitation.

[0031] The plating layer 221a is disposed on the surface of the first end 221 facing the contact 21a. Of course, when the second end 223 is used as the end connected to the contactor 21, the plating layer 221a is disposed on the surface of the second end 223 facing the contact 21a. Alternatively, the plating layer 221a can also be disposed on the surfaces of the first end 221 and the second end 223 facing the connected load. This can reduce the overall impedance of the busbar 22 when it is put into use.

[0032] To facilitate the fixed installation of the conductive busbar 22, in this embodiment, fixing holes 224 are respectively provided at the first end 221 and the second end 223. When installing the conductive busbar 22, it can be screwed to the contact 21a, the external load, or the external power supply by passing a screw through the fixing hole 224. With this setting, the conductive busbar 22 can be firmly connected to the contactor 21, the external load, or the external power supply by screwing.

[0033] Please see Figures 1 to 4 In one embodiment of the present invention, the electrical device 1 includes a heat sink 10 and a heat-conducting medium 30, wherein the heat-conducting medium 30 is configured to thermally connect the contacts of the contactor and / or the conductive busbar to the heat sink.

[0034] In one embodiment, the heat sink 10 is the housing 10 of the electrical equipment.

[0035] The technical solution of this utility model employs a heat-conducting medium 30 disposed between the contact 21a of the contactor 21 and the heat sink 10. The contactor 21 is connected to the conductive bus 22 via the contact 21a. When the contactor 21 is in use, it supplies power to or receives power from the conductive bus 22 via the contact 21a. Due to the impedance between the conductive bus 22 and the contact 21a, high temperatures are easily generated at the contact 21a when the contactor 21 is in use. In this embodiment, when the contact 21a generates high temperatures, the heat can be conducted to the heat sink 10 via the heat-conducting medium 30 connected to it. At this time, the heat sink 10 can dissipate the heat generated by the contact 21a and conducted through the heat-conducting medium 30 using its surface exposed to the external environment as a heat dissipation surface.

[0036] In one embodiment, as discussed above, when the contactor 21 is in use, heat is mainly generated at the connection between the contact 21a and the conductive busbar 22. Since the conductive busbar 22 is generally made of metal, which has high thermal conductivity, in this embodiment, the heat-conducting medium 30 is disposed between the conductive busbar 22 and the heat sink 10. When heat is generated at the connection between the contact 21a and the conductive busbar 22, the heat can be conducted to the heat-conducting medium 30 through the conductive busbar 22, and then transferred to the heat sink 10 through the heat-conducting medium 30. The heat sink 10 then dissipates heat to the external environment, achieving the same effect as described above. It is worth noting that in this embodiment, the heat-conducting medium 30 can be disposed at any position on the surface of the conductive busbar 22 facing the heat sink 10; no further limitations are imposed.

[0037] In one embodiment, the heat-conducting medium 30 is simultaneously disposed between the contact 21a of the contactor 21 and the conductive busbar 22 and the heat sink 10. For example, the conductive busbar 22 is connected to the contactor 21 by partially covering the contact 21a. In this case, part of the heat-conducting medium 30 is disposed above the part not covered by the conductive busbar 22, and the other part of the heat-conducting medium 30 is disposed above the conductive busbar 22. In this way, the heat-conducting medium 30 is disposed above both the contact 21a and the conductive busbar 22. This arrangement can achieve the same effect as the two embodiments described above, and no further limitations are imposed on it.

[0038] With the configuration in any of the above embodiments, when the contactor 21 in the electrical equipment 1 is put into use, when the contact 21a of the contactor 21 generates high temperature, the high temperature can be effectively conducted to the heat sink 10 through the heat conduction medium 30, and then dissipated to the external environment through the heat sink 10, thereby achieving efficient heat dissipation for the contactor 21.

[0039] It is understood that, in any of the above embodiments, to further improve the integration of the electrical device 1, the heat sink 10 serves as the housing of the electrical device. A mounting cavity (not shown in the figure) is provided within the heat sink 10, and the contactor 21 and the conductive bus 22 are simultaneously mounted within the mounting cavity. Furthermore, the heat sink 10 is provided with connection terminals for connecting to an external power source and / or an external load, and the conductive bus 22 within the mounting cavity is electrically connected to these connection terminals. Of course, in this embodiment, the power module also includes a power distribution unit and a control circuit board (not shown in the figure), which are not subject to further limitations.

[0040] In one embodiment, the heat sink 10 is the housing of an electrical device. The housing includes a housing body 11 and a cover 12. The housing body 11 has a mounting groove 11a, and the cover 12 covers the opening of the mounting groove 11a to form a mounting cavity. For example, Figure 3 or Figure 4 As shown, in this embodiment, the heat sink 10 includes a shell body 11 and a cover 12. The shell body 11 has a mounting groove 11a for installation. For example, a power module is installed in the mounting groove 11a. The bottom of the mounting groove 11a is provided with a plurality of support posts. At least some of the support posts are provided with positioning holes and screw holes. The bottom end of the contactor is provided with a positioning post that matches the positioning hole. The bottom outer side of the contactor is provided with a through hole corresponding to the screw hole. The user can use a screw to thread through the through hole and screw into the screw hole to fix the contactor in the mounting groove 11a.

[0041] In order to provide protection for the electronic components installed in the mounting slot 11a, a cover 12 is also provided in this embodiment. The cover 12 covers the opening of the mounting slot 11a. When the cover 12 is closed to the opening of the mounting slot 11a, the mounting slot 11a is sealed by the cover 12 to form the mounting cavity in the above embodiment.

[0042] This design facilitates the integration and assembly of electrical equipment 1. It is worth mentioning that a limiting post is provided at the diagonal or adjacent corner where the shell body 11 and the cover body 12 abut, and a limiting hole is provided on the cover body 12 at the position corresponding to the limiting post. This design can prevent fooling when the cover body 12 is installed on the shell body 11.

[0043] In one embodiment, the contactor 21 is installed in the mounting groove 11a, and the heat-conducting medium 30 is disposed between the contact 21a and / or the conductive bus 22 of the contactor 21 and the cover 12. In this embodiment, the contactor 21 is installed in the mounting groove 11a of the housing body 11, and the contact 21a of the contactor 21 is located on the side surface opposite to the bottom of the mounting groove 11a. Therefore, in this embodiment, the heat-conducting medium 30 is disposed between the contact 21a and / or the conductive bus 22 and the cover 12. That is, one end of the heat-conducting medium 30 is connected to the contact 21a or the conductive bus 22 or both the contact 21a and the conductive bus 22, and the other end is connected to the cover 12. The heat generated between the contact 21a and the conductive bus 22 is conducted to the cover 12 through the heat-conducting medium 30. This arrangement allows the cover 12 to be used more effectively as a heat dissipation device, and dissipates the heat to the external environment.

[0044] It is worth mentioning that, in order to further enhance the function of the cover 12 as a heat dissipation device, fins or heat dissipation grilles with heat dissipation function can be formed on the cover 12, and no further restrictions are imposed on this.

[0045] In one embodiment, the heat-conducting medium 30 is installed at the contact 21a of the contactor 21 and / or on the conductive bar 22. When the cover 12 is closed on the housing body 11, the end of the heat-conducting medium 30 away from the contact 21a and / or conductive bar 22 of the contactor 21 abuts against the cover 12. To improve the installation efficiency of the electrical equipment 1, in this embodiment, the heat-conducting medium 30 is fixedly installed at the contact 21a of the contactor 21 and / or on the conductive bar 22. The method of fixing can be by adhesive bonding or by screwing; no particular limitation is made. This arrangement allows the electrical equipment 1 to be assembled without adjusting the position of the heat-conducting medium 30, thus enabling faster assembly and improving assembly efficiency.

[0046] In one embodiment, the heat-conducting medium 30 is disposed on the surface of the cover 12 facing the contact 21a and / or the conductive bar 22 of the contactor 21. When the cover 12 is closed on the shell body 11, the end of the heat-conducting medium 30 away from the cover 12 abuts against the contact 21a and / or the conductive bar 22 of the contactor 21. Similarly, to improve the installation efficiency of the electrical equipment 1, unlike the above embodiment, in this embodiment, the heat-conducting medium 30 is fixedly installed on the surface of the cover 12 facing the contact 21a and / or the conductive bar 22. When the cover 12 is closed on the shell body 11, the heat-conducting medium 30 is exactly connected to the contact 21a and / or the conductive bar 22. In this embodiment, the same function as the above embodiment can be achieved, and further details are omitted.

[0047] It is worth mentioning that, in this embodiment, a limiting groove (not shown in the figure) for installing the heat-conducting medium 30 can also be formed on the surface of the cover 12 facing the contact point 21a and / or the conductive bar 22. The heat-conducting medium 30 is installed in the limiting groove by an interference fit. No further limitations are imposed on this.

[0048] In one embodiment, the contactor 21 has a plurality of contacts 21a; the heat-conducting medium 30 includes a heat-conducting body 31 and a plurality of bonding portions 32, the plurality of bonding portions 32 being disposed on the side surface of the heat-conducting body 31 facing the contactor 21, each bonding portion 32 corresponding to each contact 21a; or, the contactor 21 has a plurality of contacts 21a; the number of heat-conducting media 30 is the same as the number of contacts 21a, each heat-conducting medium 30 corresponding to each contact 21a. For example, as... Figure 2 As shown, the contactor 21 includes a positive contact 21a and a negative contact 21a, which are designed to achieve efficient heat dissipation for both contacts 21a simultaneously.

[0049] In this embodiment, the thermally conductive medium 30 includes a thermally conductive body 31 and a plurality of bonding portions 32 (such as...). Figure 3 As shown, multiple bonding parts 32 can be connected to multiple contacts 21a one by one. With this arrangement, the heat-conducting medium 30 can conduct heat to multiple contacts 21a of the contactor 21 at the same time, thereby improving the heat conduction effect and thus the heat dissipation effect.

[0050] In another embodiment, such as Figure 4 As shown, in this embodiment, the contactor 21 has multiple contacts 21a, similar to the embodiments described above. The number of heat-conducting media 30 is the same as that of the contacts 21a. Each heat-conducting media 30 is connected to one of the multiple contacts 21a. This arrangement prevents heat from each contact 21a from being transferred to adjacent or other contacts 21a through the heat-conducting media 30. The specific arrangement of the heat-conducting media 30 is not specified here.

[0051] In one embodiment, the thermally conductive medium 30 includes at least one of a thermally conductive silicone pad, a thermally conductive gel, or a blue adhesive. Exemplarily, the thermally conductive medium 30 is made of an elastic and insulating material. Its elasticity allows it to connect the contact points 21a and / or the conductive busbar 22 to the cover 12 in an interference fit after the cover 12 and the shell body 11 are closed, thereby improving thermal conductivity; while the insulation prevents electrical leakage. In this embodiment, for example, the thermally conductive medium 30 can be at least one of a thermally conductive silicone pad, a thermally conductive gel, or a blue adhesive; this is not limited in detail.

[0052] This utility model also proposes a new energy vehicle, which includes an electrical device 1. The specific structure of the electrical device 1 is as described in the above embodiments. Since this new energy vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0053] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made under the technical concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An electrical device, characterized by include: Contactor; A conductive busbar, one end of which is electrically connected to the contactor's contact, and at the electrical connection point between the two, at least one of the contactor and the conductive busbar is provided with a plating layer, the resistivity of which is less than the resistivity of the conductive busbar and the resistivity of the contact.

2. The electrical device of claim 1, wherein, The conductive bus includes a first end, a second end, and a connecting section for connecting the first end and the second end, and the plating is provided on the surface of the first end facing the contact point of the contactor; And / or, the first end and the second end are respectively provided with fixing holes, and the first end is detachably connected to the contactor by bolts.

3. The electrical device of claim 1, wherein, The coating is applied to the surface of the contactor on the side facing the conductive busbar.

4. The electrical device of claim 1, wherein, The electrical equipment further includes a heat sink and a heat-conducting medium, the heat-conducting medium being configured to thermally connect the contacts of the contactor and / or the conductive busbar to the heat sink.

5. The electrical device of claim 4, wherein, The heat sink is the housing of the electrical equipment.

6. The electrical device of claim 5, wherein, The housing includes a housing body and a cover. The housing body has a mounting groove. The cover is disposed over the opening of the mounting groove to form a mounting cavity. The contactor is installed in the mounting cavity. The heat-conducting medium is disposed between the contacts of the contactor and / or the conductive bar and the cover.

7. The electrical device of claim 6, wherein, The heat-conducting medium is installed at the contact point of the contactor and / or on the conductive bar. When the cover is closed on the shell body, one end of the heat-conducting medium away from the contact point of the contactor and / or the conductive bar abuts against the cover. Alternatively, the thermally conductive medium is disposed on the surface of the cover facing the contact point of the contactor and / or the conductive bar, and when the cover is closed on the shell body, the end of the thermally conductive medium away from the cover abuts against the contact point of the contactor and / or the conductive bar.

8. The electrical equipment as claimed in claim 4, characterized in that, The contactor has multiple contacts; The thermally conductive medium includes a thermally conductive body and a plurality of bonding portions. The plurality of bonding portions are disposed on the side surface of the thermally conductive body facing the contactor, and each bonding portion corresponds to each contact point. Alternatively, the contactor may have multiple contacts; the number of thermally conductive media is the same as the number of contacts, and each thermally conductive medium corresponds one-to-one with each contact.

9. The electrical equipment as claimed in claim 4, characterized in that, The thermally conductive medium includes at least one of thermally conductive silicone pads, thermally conductive gels, or blue adhesive.

10. The electrical device according to any one of claims 1 to 9, wherein The conductive busbar is a copper busbar or an aluminum busbar; the plating material is gold or silver.

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