Relay assembly, battery pack cut-off unit, battery pack and vehicle

Abstract

The utility model provides a relay assembly, a battery pack cut-off unit, a battery pack and a vehicle. The relay assembly comprises a relay, a metal bar and a heat dissipation piece, the metal bar comprises a straight line segment, the straight line segment comprises a first surface and a second surface which are arranged oppositely, the first surface is attached to the surface of the relay and is in electric contact with the relay, and the heat dissipation piece is attached to the second surface. By arranging the heat dissipation piece at the contact position of the metal bar and the relay, the heat dissipation piece can timely discharge a large amount of heat generated at the electric contact position of the metal bar and the relay, so that the heat dissipation effect is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of power batteries, and in particular to a relay assembly, a battery pack disconnection unit, a battery pack and a vehicle. Background Art

[0002] The Battery Disconnect Unit (BDU), as a distribution box designed specifically for electric vehicle power batteries, plays a relatively important role in it. When the power battery system inside the electric vehicle reports an error, it can cut off the internal current to ensure the safety of the system.

[0003] The battery pack disconnection unit includes a relay assembly. In the relay assembly, the electrical contact position between the relay and the metal bus is prone to generate heat, and this heat needs to be discharged in a timely manner. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the background technology, it is desirable to provide a relay assembly, a battery pack disconnection unit, a battery pack and a vehicle.

[0005] In a first aspect of the present application, a relay assembly is provided, comprising: a relay, a metal bar and a heat sink; the metal bar comprises a straight segment, the straight segment comprises a first surface and a second surface arranged opposite to each other, the first surface is attached to the surface of the relay and is in electrical contact with the relay, and the heat sink is attached to the second surface.

[0006] As an achievable manner, the heat sink includes a heat conducting plate and a cooling plate, and the heat sink, the heat conducting plate and the cooling plate are stacked in sequence.

[0007] As an implementable manner, an insulating layer is further included, the cooling plate is a metal plate, and the insulating layer is arranged between the heat conducting plate and the cooling plate to insulate the cooling plate from the metal row.

[0008] As an achievable manner, the heat conducting plate includes a first sub-plate, a second sub-plate and a third sub-plate;

[0009] The first sub-board is attached to the cooling plate, the third sub-board is attached to the metal row, the third sub-board is spaced apart from the first sub-board, and the second sub-board is connected between the first sub-board and the third sub-board.

[0010] As a feasible manner, the first sub-board, the second sub-board and the third sub-board are integrally formed.

[0011] As an implementable manner, the first sub-board and the third sub-board are substantially parallel, and the second sub-board extends in a direction inclined to the first sub-board.

[0012] As an implementable manner, the second sub-board is in the shape of a curved surface.

[0013] As a feasible manner, a contact isolating portion and a plurality of contacts are provided on the surface of the relay, the contact isolating portion divides the surface into a plurality of independent areas, and the plurality of contacts are arranged in a one-to-one correspondence in the plurality of independent areas.

[0014] As a feasible method, the straight line segment includes an electrical contact portion, the electrical contact portion is attached to the surface of the relay, the heat sink is arranged on the side of the electrical contact portion away from the relay, and the heat sink covers multiple contacts; the heat sink includes a fixing portion, the fixing portion is provided with a groove, and the groove cooperates with the contact isolation portion.

[0015] As a feasible manner, the heat conducting plate is symmetrically arranged with the extension direction of the contact isolating portion on the relay surface as an axis.

[0016] As a feasible method, the straight section includes an electrical contact portion, the electrical contact portion is attached to the relay, and the heat sink is arranged on the side of the electrical contact portion away from the relay; the relay assembly also includes a bolt, which is sequentially passed through the heat sink, the electrical contact portion and the relay.

[0017] A second aspect of the present application provides a battery pack disconnection unit, comprising the relay assembly of the first aspect.

[0018] A third aspect of the present application provides a battery pack, comprising the battery pack disconnection unit of the second aspect.

[0019] A fourth aspect of the present application provides a vehicle comprising the battery pack of the third aspect.

[0020] The present application provides a relay assembly, a battery pack disconnection unit and a battery pack. By arranging a heat sink at the contact position between the metal bus and the relay, the heat sink can promptly discharge a large amount of heat generated at the electrical contact position between the metal bus and the relay, thereby improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings;

[0022] Figure 1 A schematic diagram of the heat conduction plate structure of an embodiment provided in the present application;

[0023] Figure 2 A bottom view of a heat conducting plate according to an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of a relay assembly according to an embodiment of the present application;

[0025] Figure 4 A bottom view of a relay assembly according to an embodiment of the present application;

[0026] Figure 5 A front view of a relay assembly according to an embodiment of the present application;

[0027] Figure 6 An exploded view of the installation of a relay assembly according to an embodiment of the present application;

[0028] Figure 7 An assembly structure diagram of a relay assembly according to an embodiment of the present application.

[0029] In the figure,

[0030] 10. Relay, 11. Contact, 12. Contact isolation part, 13. Independent area, 14. Bolt,

[0031] 20. Metal row, 21. Straight line segment, 22. First surface, 23. Second surface, 24. Electrical contact portion,

[0032] 30. heat sink, 31. cooling plate, 32. insulation layer,

[0033] 40. heat conducting plate, 41. first sub-plate, 42. second sub-plate, 43. third sub-plate, 44. fixing portion, 45. groove. DETAILED DESCRIPTION

[0034] The present application will be further described in detail below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the present application can be implemented in various forms and should not be limited by the implementation methods described herein. On the contrary, these implementation methods are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art. It is also necessary to explain that, for ease of description, only the parts related to the present application are shown in the accompanying drawings.

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] Embodiments of the present application provide a relay assembly, a battery pack disconnection unit, and a battery pack.

[0037] In a first aspect of the present application, a relay assembly is provided. Figure 3-Figure 5 As shown, the relay assembly includes a relay 10, a metal bar 20 and a heat sink 30. The metal bar 20 includes a straight segment 21. The straight segment 21 includes a first surface 22 and a second surface 23 that are arranged opposite to each other. The first surface 22 is attached to the surface of the relay 10 and is in electrical contact with the relay 10. The heat sink 30 is attached to the second surface 23.

[0038] The area where the heat sink 30 is in contact with the second surface 23 needs to use a thermally conductive insulating material, such as ceramic or other solid insulating and thermally conductive materials with excellent strength. On the one hand, it can quickly dissipate heat, and on the other hand, it can prevent short circuits and ensure normal electrical contact between the metal bus 20 and the relay 10.

[0039] Among them, the first surface 22 and the second surface 23 refer to two surfaces with relatively large surface areas on the straight segment 21 of the metal bar 20. When the heat sink 30 is attached to the second surface 23, the heat sink 30 is arranged on the side of the metal bar 20 away from the relay 10. Since the thickness of the metal bar 20 is small and the metal material has a good thermal conductivity, the heat sink 30 is arranged on the side of the metal bar 20 away from the relay 10, so as to achieve a better heat dissipation effect. It should be understood that the straight segment 21 of the metal bar 20 includes an electrical contact portion 24 and a non-electrical contact portion 24. The portion of the straight segment 21 that is attached to the surface of the relay 10 is the electrical contact portion 24, and the portion of the straight segment 21 that is not attached to the surface of the relay 10 is the non-electrical contact portion 24, and the non-electrical contact portion 24 plays a role in current conduction. The heat sink 30 can be attached to the second surface 23 of the electrical contact portion 24, or to the second surface 23 of the non-electrical contact portion 24. Preferably, when the heat sink 30 is attached to the second surface 23 of the electrical contact portion 24 , it has a better heat dissipation effect. At this time, the heat sink 30 is closer to the electrical contact position and can promptly dissipate the heat at the contact position between the metal bus 20 and the relay 10 .

[0040] The relay 10 and the metal bus 20 are in electrical contact with each other to achieve current and signal transmission with other components in the battery pack. During the current and signal transmission, a large amount of heat is generated at the electrical contact position between the relay 10 and the first surface 22 of the metal bus 20. By fitting the heat sink 30 on the second surface 23, a large amount of heat at the electrical contact position between the metal bus 20 and the relay 10 can be discharged in time, thereby improving the heat dissipation effect.

[0041] In some embodiments, the heat sink 30 includes a heat conducting plate 40 and a cooling plate 31, one side surface of the heat conducting plate 40 is attached to the cooling plate 31, and the other side surface of the heat conducting plate 40 is attached to the second surface 23 of the metal row 20. It should be noted that the one side surface and the other side surface of the heat conducting plate 40 refer to two oppositely arranged surfaces in the heat conducting plate 40 with a plate-like structure, and the two surfaces are arranged oppositely in the thickness direction. The two surfaces have a larger area than other surfaces, and a larger surface contact can increase the heat exchange area and improve the heat exchange efficiency. Among them, the cooling plate 31 can be a metal plate or an insulating plate with good thermal conductivity. Preferably, the cooling plate 31 is usually set as a metal plate, and the metal has good thermal conductivity, such as silver, copper, aluminum, molybdenum and alloys thereof. A fluid flow channel is set in the cooling plate 31, and a cooling medium is provided in the fluid flow channel. The cooling plate 31 exchanges heat with the cooling medium and then exchanges heat with the heat conducting plate 40, thereby achieving heat dissipation of the heat conducting plate 40. The material and structure of the heat conducting plate 40 have good heat conducting effect, and are used to conduct heat from the electrical contact position between the metal bar 20 and the relay 10 , and achieve heat exchange with the cooling plate 31 .

[0042] In some embodiments, the cooling plate 31 is a metal plate, and the cooling plate 31 includes an insulating layer, which is arranged between the heat conducting plate 40 and the cooling plate 31, so as to insulate the cooling plate 31 from the metal row 20. Wherein, if the cooling plate 31 is set as a metal plate, if the height of the heat conducting plate 40 is not enough, the tail of the metal row 20 is easy to contact with the cooling plate 31, causing a short circuit, and the insulating layer 32 is arranged on the contact surface of the heat conducting plate 40 and the cooling plate 31, so as to ensure that when the heat conducting plate 40 is set to any height, the metal row 20 and the cooling plate 31 can be fully insulated. Preferably, as Figure 6 As shown, the insulating layer 32 can be an insulating plate or insulating film of the same size as the surface of the cooling plate 31, which can basically completely cover the conductive surface of the cooling plate 31. The insulating plate is a separate plate structure, which is easy to produce and avoid processing on the cooling plate.

[0043] In some embodiments, Figure 1-2 As shown, the heat conducting plate 40 includes a first sub-plate 41, a second sub-plate 42 and a third sub-plate 43. The first sub-plate 41 is attached to the cooling plate 31, the third sub-plate 43 is attached to the metal row 20, the third sub-plate 43 is spaced apart from the first sub-plate 41, and the second sub-plate 42 is connected between the first sub-plate 41 and the third sub-plate 43. The metal row 20 exchanges heat with the cooling plate 31 through the third sub-plate 43, the second sub-plate 42 and the first sub-plate 41. At the same time, the third sub-plate 43 is spaced apart from the first sub-plate 41, and the second sub-plate 42 is connected between the first sub-plate 41 and the third sub-plate 43, so that the heat conducting plate 40 can support the relay assembly.

[0044] In some embodiments, the first sub-plate 41, the second sub-plate 42 and the third sub-plate 43 are integrally formed to simplify the production layout and improve the production cycle.

[0045] In some embodiments, Figure 1 to Figure 2 As shown, the first sub-plate 41 and the third sub-plate 43 are substantially parallel, and the second sub-plate 42 extends in a direction inclined to the first sub-plate 41, so that the heat conducting plate 40 can support the relay assembly. The second sub-plate 42 extends in a direction inclined to the first sub-plate 41, so that a certain slope can be formed between the second sub-plate 42 and the first sub-plate 41 and the third sub-plate 43, so as to buffer and reduce vibration, improve the strength and stability of the heat conducting plate 40, and also compensate for the position tolerance and shape tolerance in the vertical direction.

[0046] Preferably, the first sub-plate 41 is an annular structure, which can make the heat conducting plate 40 bear force uniformly when supported, and the annular structure has an opening to facilitate the installation of the heat conducting plate 40. Preferably, the second sub-plate 42 is set as a curved surface, and the diameter of the second sub-plate 42 gradually increases from the third sub-plate 43 to the first sub-plate 41. This curved surface structure can not only make the second sub-plate 42 bear force uniformly, but also can withstand a larger deformation space.

[0047] As an achievable manner, a plurality of contacts 11 are provided on the surface of the relay 10, and a contact isolating portion 12 is provided on the surface of the relay 10, and the contact isolating portion 12 divides the surface into a plurality of independent areas 13, and the plurality of contacts 11 are arranged in a one-to-one correspondence in the plurality of independent areas 13. The relay 10 has contacts 11 on its surface, and the metal bar 20 is in electrical contact with the relay 10 through the contacts 11, and the plurality of contacts 11 are in electrical contact with the plurality of metal bars 20, respectively. In order to ensure that the plurality of electrical contacts 24 do not affect each other, the contact isolating portion 12 is provided to divide the surface into a plurality of independent areas 13, and ensure that each electrical contact 24 is in a different independent area 13, which complies with safety specifications.

[0048] As a feasible method, the straight line segment 21 includes an electrical contact portion 24, the electrical contact portion 24 is attached to the surface of the relay 10, the heat sink 30 is arranged between the electrical contact portion 24 and the relay 10 or on the side of the electrical contact portion 24 away from the relay 10, and the heat sink 30 covers multiple contacts 11 to achieve heat dissipation of multiple electrical contacts 24. The heat sink 30 includes a fixed portion 44, and a groove 45 is provided on the fixed portion 44, and the groove 45 is matched with the contact 11 baffle on the relay 10. This matching method can enable the heat sink 30 to be positioned in two directions on the contact surface with the surface of the relay 10, ensure the stability of the support, and improve the overall structural strength of the relay assembly. Among them, the groove 45 is matched with the contact 11 baffle on the relay 10, and the groove 45 on the fixed portion 44 can just accommodate the contact 11 baffle on the relay 10, or after the groove 45 on the fixed portion 44 is matched with the contact 11 baffle on the relay 10, there is still a certain distance between the top of the contact 11 baffle and the bottom of the groove 45. Preferably, when the groove 45 on the fixing portion 44 is just able to accommodate the baffle of the contact 11 on the relay 10 , the heat sink 30 can be closer to the surface of the relay 10 , and the conductive efficiency is higher.

[0049] As a feasible manner, the heat conducting plate 40 is symmetrically arranged with the extending direction of the contact isolating portion 12 on the surface of the relay 10 as an axis, so that the heat conducting plate 40 is subjected to uniform force.

[0050] As an achievable method, the straight section 21 includes an electrical contact portion 24, the electrical contact portion 24 is attached to the relay 10, the heat sink 30 is arranged between the electrical contact portion 24 and the relay 10 or on the side of the electrical contact portion 24 away from the relay 10, and also includes a bolt 14, the bolt 14 is sequentially penetrated through the heat sink 30, the electrical contact portion 24 and the relay 10. The surface of the contact 11 of the relay 10 is provided with threads, the bolt 14 is conductive, and can ensure the electrical contact between the electrical contact portion 24 and the relay 10, and through holes are provided on the electrical contact portion 24 and the heat sink 30, so that the bolt 14 can penetrate, and at the same time, the heat sink 30, the electrical contact portion 24 and the relay 10 are fixedly connected, thereby improving the structural stability of the relay assembly.

[0051] In a second aspect of the present application, a battery pack disconnection unit is provided, the battery pack disconnection unit comprising a housing and a relay assembly, the relay assembly being disposed in the housing, and the relay assembly being the relay assembly of the battery pack disconnection unit provided above. With the battery pack disconnection unit, the cooling plate 31 can be used to dissipate heat from the relay 10 and the metal bar 20, so that the heat dissipation effect of the relay 10 and the metal bar 20 can be enhanced, thereby enhancing the heat dissipation capacity of the battery pack disconnection unit.

[0052] In a third aspect of the present application, a battery pack is provided, the battery pack comprising a battery module and a battery pack disconnection unit, the battery pack disconnection unit being electrically connected to the battery module, and the battery pack disconnection unit being the battery pack disconnection unit provided above. With the battery pack disconnection unit, the cooling plate 31 can be used to dissipate heat from the relay 10 and the metal bar 20, so that the heat dissipation effect of the relay 10 and the metal bar 20 can be enhanced, thereby enhancing the heat dissipation capacity of the battery pack disconnection unit.

[0053] In a fourth aspect of the present application, a vehicle is provided, the vehicle comprising a battery pack. The vehicle may be a hybrid vehicle or a pure electric vehicle.

[0054] It should be understood that the terms "center", "axial", "circumferential", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate positions or positional relationships are based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0055] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A relay assembly, characterized in that: include: Relays, metal bars and heat sinks; The metal row includes a straight line segment, and the straight line segment includes a first surface and a second surface that are arranged opposite to each other. The first surface is attached to the surface of the relay and is in electrical contact with the relay, and the heat sink is attached to the second surface.

2. The relay assembly according to claim 1, characterized in that The heat sink comprises a heat conducting plate and a cooling plate, and the heat sink, the heat conducting plate and the cooling plate are stacked in sequence.

3. The relay assembly according to claim 2, characterized in that: It also includes an insulating layer, the cooling plate is a metal plate, and the insulating layer is arranged between the heat conducting plate and the cooling plate to insulate the cooling plate from the metal row.

4. The relay assembly according to claim 2, characterized in that: The heat conducting plate comprises a first sub-plate, a second sub-plate and a third sub-plate; The first sub-board is attached to the cooling plate, the third sub-board is attached to the metal row, the third sub-board is spaced apart from the first sub-board, and the second sub-board is connected between the first sub-board and the third sub-board.

5. The relay assembly according to claim 4, characterized in that: The first sub-board, the second sub-board and the third sub-board are integrally formed.

6. The relay assembly according to claim 4, characterized in that The first sub-board and the third sub-board are substantially parallel, and the second sub-board extends in a direction inclined to the first sub-board.

7. The relay assembly according to claim 6, characterized in that The second sub-plate is in the shape of a curved surface.

8. The relay assembly according to claim 1, characterized in that A contact isolating portion and a plurality of contacts are provided on the surface of the relay, wherein the contact isolating portion divides the surface into a plurality of independent areas, and the plurality of contacts are arranged in a one-to-one correspondence in the plurality of independent areas.

9. The relay assembly according to claim 8, characterized in that The straight line segment includes an electrical contact portion, the electrical contact portion is attached to the surface of the relay, the heat sink is arranged on a side of the electrical contact portion away from the relay, and the heat sink covers a plurality of contacts; The heat sink comprises a fixing portion, a groove is formed on the fixing portion, and the groove matches the contact isolation portion.

10. The relay assembly according to claim 9, characterized in that The heat sink comprises a heat conducting plate and a cooling plate, and the heat sink, the heat conducting plate and the cooling plate are stacked in sequence; the heat conducting plate is symmetrically arranged with the extension direction of the contact isolation portion on the surface of the relay as the axis.

11. The relay assembly according to claim 1, characterized in that The straight section includes an electrical contact portion, which is attached to the relay, and the heat sink is arranged on a side of the electrical contact portion away from the relay; the relay assembly also includes a bolt, which is sequentially passed through the heat sink, the electrical contact portion and the relay.

12. A battery pack disconnection unit, characterized in that: A relay assembly comprising any one of claims 1-11.

13. A battery pack, characterized in that: Includes the battery pack disconnection unit as described in claim 12.

14. A vehicle, characterized in that: Including the battery pack as claimed in claim 13.

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