A power distribution unit of a power battery, a power battery and a vehicle

Abstract

The application discloses a power distribution unit of a power battery, the power battery and a vehicle. The power distribution unit comprises a shell, a busbar integrated on the shell, a relay, contacts of the relay weldedly connected with the busbar, the contacts penetrating through the thickness direction of the busbar, a heat-conducting pad arranged along the thickness direction of the busbar and arranged on the lower surface of the busbar, the heat-conducting pad being attached to the lower surface of the busbar in the thickness direction, and the contacts of the relay being in contact with the heat-conducting pad. The busbar and the relay are welded, so that the busbar does not need to be bent, the busbar is flat, the busbar is attached to the heat-conducting pad, the area of the busbar attached to the heat-conducting pad for heat dissipation is increased, the heat dissipation effect of the busbar is improved, the cooling effect of the BDU is ensured, and the resistance of the BDU circuit is reduced. In addition, the contacts of the relay penetrate through the busbar and are in contact with the heat-conducting pad, so that the heat-conducting pad can directly dissipate heat for the contacts of the relay, the heat dissipation effect of the busbar is further improved, and the resistance of the BDU circuit is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of power distribution units, and more particularly to a power distribution unit for a power battery, a power battery, and a vehicle. Background Technology

[0002] The power battery is the core power component of an electric vehicle, providing energy for its propulsion. It includes one or more battery packs and a Battery Management System (BMS). The Battery Distribution Unit (BDU) is a crucial component of the BMS, primarily responsible for power distribution and current carrying in the high-voltage circuit. With the widespread adoption of supercharging technology for power batteries and the continuous improvement of charging rates, the resistance requirements for the BDU circuits are also increasing.

[0003] BDU consists of components and busbars connecting the components. During BDU operation, the current flowing through the busbars will cause the busbar temperature to rise. The rise in busbar temperature will lead to an increase in the resistance of the busbar. In order to reduce the resistance in the BDU circuit, the BDU needs to be cooled.

[0004] Currently, the method for cooling the BDU is liquid cooling, which involves attaching the busbar to a thermal pad, allowing the thermal pad to exchange heat with a cold plate, thereby cooling the busbar and reducing the resistance in the BDU circuit.

[0005] Currently, the busbars and components are connected by bolts. In order to avoid the location where the busbars are connected to the bolts, the busbars need to be bent. However, the bent part of the busbar cannot contact the thermal pad, which results in poor heat dissipation at the bent part of the busbar, affecting the cooling effect of the BDU and making it difficult to reduce the resistance of the BDU circuit.

[0006] Therefore, how to provide a power distribution unit for a power battery that ensures the flatness of the busbar to increase the heat exchange area of ​​the busbar and ensure the cooling effect is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of the above problems, the present invention provides a power distribution unit for a power battery, ensuring the flatness of the busbar to increase the heat exchange area of ​​the busbar and ensure the cooling effect. Furthermore, the present invention also provides a power battery and a vehicle having the above-mentioned power distribution unit for a power battery.

[0008] The specific plan is as follows:

[0009] The first aspect of the present invention provides a power distribution unit for a power battery, comprising: a housing, wherein a busbar is integrated on the housing; a relay, wherein the contacts of the relay are welded to the busbar and the contacts of the relay extend through the thickness direction of the busbar; and a thermal pad, wherein the thermal pad and the housing are arranged along the thickness direction of the busbar, and the thermal pad is arranged on the lower surface of the busbar, the thermal pad is attached to the lower surface of the busbar along the thickness direction, and the thermal pad is in contact with the contacts of the relay.

[0010] In one possible implementation, in the power distribution unit of the aforementioned power battery, the relay contacts have a stepped structure, and the cross-sectional dimension of the section near the busbar is larger than the cross-sectional dimension of the section away from the busbar; the busbar of the housing has a through hole, the through hole mates with the section of the relay contacts near the busbar, and the through hole is welded to the section of the contacts near the busbar.

[0011] In one possible implementation, in the power distribution unit of the aforementioned power battery, the contact includes a first segment and a second segment, the first segment being away from the busbar and the second segment being close to the busbar; the through hole mates with the second segment, and when the surface of the first segment close to the second segment abuts against the lower surface of the through hole along the thickness direction of the busbar, the surface of the second segment away from the first segment is flush with the lower surface of the through hole along the thickness direction of the busbar.

[0012] In one possible implementation, in the power distribution unit of the aforementioned power battery, the inner wall of the through hole is welded to the outer surface of the second section in the circumferential direction; the upper surface of the busbar along the thickness direction is welded to the stepped surfaces of the first and second sections.

[0013] In one possible implementation, the power distribution unit of the aforementioned power battery further includes a fuse, the fuse including a contact blade for electrical connection; the contact blade is welded to the busbar of the housing.

[0014] In one possible implementation, in the power distribution unit of the aforementioned power battery, the contact blade overlaps the upper surface of the busbar along the thickness direction, and the overlapping position of the contact blade and the busbar is welded using laser welding.

[0015] In one possible implementation, the power distribution unit of the aforementioned power battery further includes a shunt, the shunt including a connection terminal for electrical connection; the connection terminal is welded to the busbar of the housing.

[0016] In one possible implementation, in the power distribution unit of the aforementioned power battery, the connection end of the shunt is overlapped with the upper surface of the busbar along the thickness direction, and the overlap position of the connection end and the busbar is welded by laser welding.

[0017] In one possible implementation, the power distribution unit of the aforementioned power battery further includes: a conductive component; the conductive component is welded to the busbar of the housing.

[0018] In one possible implementation, in the power distribution unit of the aforementioned power battery, the conductive element overlaps the upper surface of the busbar along the thickness direction, and the overlap position of the conductive element and the busbar is welded using laser welding.

[0019] In one possible implementation, in the power distribution unit of the aforementioned power battery, the housing and the busbar are injection molded as an integral structure.

[0020] A second aspect of the present invention provides a power battery for a vehicle, including a power distribution unit, wherein the power distribution unit is any of the power distribution units described above.

[0021] A third aspect of the present invention provides a vehicle including a power battery, wherein the power battery is the power battery described above.

[0022] By employing the above technical solution, the power distribution unit of the power battery provided by this invention uses welding between the busbar and the relay, thus eliminating the need to bend the busbar. This ensures the busbar remains flat, guaranteeing proper contact between the busbar and the thermal pad, increasing the contact area for heat dissipation, and improving the busbar's heat dissipation effect. This, in turn, ensures the cooling effect of the BDU (Brain Duct Integrated Circuit) and reduces the resistance of the BDU circuit. Furthermore, the relay contacts pass through the busbar and contact the thermal pad, allowing the thermal pad to directly dissipate heat from the relay contacts, further improving the busbar's heat dissipation effect and reducing the resistance of the BDU circuit. Attached Figure Description

[0023] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0024] Figure 1 Connection method of power distribution unit for power battery provided by existing technology;

[0025] Figure 2 This is a schematic diagram of the power distribution unit of a power battery provided in an embodiment of the present invention;

[0026] Figure 3 A split view of the power distribution unit of a power battery provided in an embodiment of the present invention;

[0027] Figure 4 A top view of the power distribution unit of a power battery provided in an embodiment of the present invention;

[0028] Figure 5 This is a front view of the connection relationship between the relay and the busbar provided in an embodiment of the present invention;

[0029] Figure 6 This is a front view of the connection relationship between the splitter and the busbar provided in an embodiment of the present invention;

[0030] Figure 7 A top view showing the connection relationship between the relay, shunt, and busbar provided in an embodiment of the present invention;

[0031] Figure 8 This is a front view of the connection relationship between the fuse and the busbar provided in an embodiment of the present invention;

[0032] Figure 9 A top view showing the connection relationship between the fuse and the busbar according to an embodiment of the present invention;

[0033] Figure 10 This is a front view of the connection relationship between the conductive component and the busbar provided in an embodiment of the present invention;

[0034] Figure 11 This is a top view showing the connection relationship between the conductive component and the busbar provided in an embodiment of the present invention. Detailed Implementation

[0035] The embodiments of the present invention will now be described with reference to the accompanying drawings. The terminology used in the embodiments section is for illustrative purposes only and is not intended to limit the scope of the invention.

[0036] The embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems. It should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0037] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the description of embodiments of the invention. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of units is not necessarily limited to those units, but may include other units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] The power battery is the core power component of an electric vehicle, providing energy for its propulsion. It includes one or more battery packs and a Battery Management System (BMS). The Battery Distribution Unit (BDU) is a crucial component of the BMS, primarily responsible for power distribution and current carrying in the high-voltage circuit. With the widespread adoption of supercharging technology for power batteries and the continuous improvement of charging rates, the resistance requirements for the BDU circuits are also increasing.

[0039] BDU consists of components and busbars connecting the components. During BDU operation, the current flowing through the busbars will cause the busbar temperature to rise. The rise in busbar temperature will lead to an increase in the resistance of the busbar. In order to reduce the resistance in the BDU circuit, the BDU needs to be cooled.

[0040] Currently, liquid cooling is used to cool BDUs, such as... Figure 1 As shown, Figure 1 The busbar 01 on the housing is connected to the components by bolts 03. The busbar 01 connecting the components is in close contact with the heat-conducting component 02. The heat-conducting component 02 exchanges heat with the cold plate, thereby achieving heat exchange between the heat-conducting component 02 and the busbar 01, cooling the busbar 01 and reducing the resistance in the BDU circuit.

[0041] Currently, busbar 01 is connected to the components by bolts. In order to avoid the connection between busbar 01 and bolt 03, busbar 01 needs to be bent. However, the bent part of busbar 01 cannot contact the heat-conducting component 02, which results in poor heat dissipation at the bent part of busbar 01, affecting the cooling effect of BDU and making it difficult to reduce the resistance of BDU circuit.

[0042] Based on the above-mentioned technical problems, this application discloses a power distribution unit (BDU) that changes the connection method between the busbar and the components to ensure the flatness of the busbar and the adhesion between the busbar and the thermal pad, thereby increasing the heat dissipation area of ​​the busbar and the thermal pad, improving the heat dissipation effect of the busbar, and thus ensuring the cooling effect of the BDU and reducing the resistance of the BDU circuit.

[0043] like Figures 2 to 4 As shown, the power distribution unit disclosed in this application includes: a housing 1, a relay 2, a fuse 3, a shunt 4, a conductive component 5, and a thermal pad 6.

[0044] Among them, relay 2, fuse 3, shunt 4, and conductive element 5 are all structural components. It should be noted that the components include, but are not limited to, the structures disclosed above, and the components can be set according to different needs. This application embodiment only uses the components disclosed above as examples for illustration; other components can refer to the connection methods in this document.

[0045] The housing 1 in this embodiment serves as the mounting base for the power distribution unit. The shape and size of the housing 1 can be set according to different needs. A busbar is connected to the housing 1, and the busbar can be used to realize the electrical connection of the relay 2, fuse 3, shunt 4 and conductive component 5.

[0046] It should be noted that the shape, size and arrangement of the busbar can be set according to different needs. The positions on the busbar used to connect relay 2, fuse 3, shunt 4 and conductive parts 5 are different positions of the busbar.

[0047] In optional embodiments, the housing 1 and the busbar can be integrally injection molded. In some embodiments, the housing 1 is made of plastic material, and the busbar is made of copper busbar, among other things. During the injection molding process, the busbar is injection molded onto the housing 1.

[0048] The thermal pad 6 is attached to the busbar of the housing 1 to dissipate heat from the busbar of the housing 1, thereby reducing the temperature of the busbar of the housing 1 during operation.

[0049] Combination Figure 5 and Figure 7 As shown, relay 2 is welded to housing 1. Optionally, relay 2 and the busbar of housing 1 are welded together.

[0050] In some embodiments, the relay 2 includes, but is not limited to, a ceramic-sealed relay, wherein the contacts of the relay 2 are brazed to the ceramic body of the relay 2. The contacts of the relay 2 are joined to the busbar of the housing 1 by a welded joint method; since the welding energy of this welded joint method is relatively low, it will not damage the internal structure of the relay 2. The contacts 21 of the relay 2 are laser-welded to the busbar of the housing 1.

[0051] The contact 21 of relay 2 has a stepped structure, and the busbar of housing 1 has through holes adapted to the stepped structure. Optionally, the stepped structure of the contact 21 of relay 2 includes: a first segment 211 and a second segment 212, wherein the second segment 212 is close to the busbar of housing 1, and the first segment 211 is... Figure 4 The size of the transverse section in the middle is larger than the size of the transverse section of the second segment 212, so that the first segment 211 and the second segment 212 form a stepped structure.

[0052] The through-hole on the busbar of housing 1 extends through the busbar along its thickness direction and is connected to the second segment 212. After the contact 21 of relay 2 is assembled and connected to the through-hole on the busbar, the first segment 211 abuts against the upper surface of the busbar of housing 1 along its thickness direction, achieving a limiting insertion between the contact 21 of relay 2 and the busbar of housing 1. The lower surface of the second segment 212 along its thickness direction is flush with the lower surface of the busbar of housing 1, ensuring a flat lower surface for the busbar of housing 1.

[0053] It should be noted that the arrangement direction of the shell 1 and the thermal pad 6 in this article is the thickness direction. The lower surface in this article is the position close to the thermal pad 6, and the upper surface is the position away from the thermal pad 6.

[0054] It should be noted that in this embodiment, the contact 21 of the relay 2 is inserted into the busbar of the housing 1 and soldered, thus achieving a fixed connection between the contact 21 of the relay 2 and the busbar of the housing 1. Furthermore, the contact 21 passes through the busbar and is flush with its lower surface, allowing the thermal pad 6 to directly contact the contact 21 of the relay 2 when it is in contact with the busbar. This enables the thermal pad 6 to directly exchange heat and cool the contact 21 of the relay 2. Since the relay 2 has the highest internal resistance among the components of the power distribution unit, and the location where the relay 2 generates the most heat is its contact 21, using the thermal pad 6 to directly contact and dissipate heat from the contact 21 of the relay 2 can greatly improve the heat exchange efficiency between the thermal pad 6 and the power distribution unit, thereby reducing the temperature of the power distribution unit.

[0055] In some embodiments, after the contact 21 of the relay 2 is inserted into the busbar of the housing 1, the contact position of the second segment 212 and the through hole can be welded to realize the connection between the contact 21 of the relay 2 and the busbar of the housing 1.

[0056] Optionally, both the first segment 211 and the second segment 212 are cylindrical structures with circular through holes. After welding the contact position between the second segment 212 and the through hole, a circular first welding trajectory 11 will be formed on the lower surface of the busbar, such as... Figure 7 As shown.

[0057] It should be noted that the contacts 21 of relay 2 and the busbar of housing 1 are connected by a first welding trajectory 11, which integrates the lower surface of the first section 211 and the side of the second section 212 with the busbar of housing 1, thereby increasing the connection strength between the contacts 21 of relay 2 and the busbar of housing 1 after welding. Optionally, the welding power during the welding process is 2500W, the welding speed is 61mm / s, and after the contacts 21 of relay 2 and the busbar of housing 1 are welded, a pull-out force of at least 2000N·m is required to separate the contacts 21 of relay 2 from the busbar of housing 1.

[0058] To ensure the welding yield of the contacts 21 of relay 2 and the busbar of housing 1, the dimension of the contacts 21 of relay 2 along the thickness direction of the busbar is larger than the dimension of the busbar along the thickness direction, and the upper surface of the contacts 21 is within 0.2mm higher than the upper surface of the busbar. The thickness of the busbar of housing 1 is generally in the range of 2mm-4mm.

[0059] It should be noted that other components with higher internal resistance can also be connected to the busbar of housing 1 and then soldered, which will not be elaborated here.

[0060] The following combination Figure 6 and Figure 7 The connection method between the splitter 4 and the busbar of the housing 1 is explained.

[0061] like Figure 6 As shown, the splitter 4 is welded to the busbar of the housing 1. Optionally, the connection end of the splitter 4 is lap-welded to the busbar of the housing 1.

[0062] In some embodiments, the connection end of the shunt 4 is used for electrical connection with other structures. The connection end of the shunt 4 is stacked with the busbar of the housing 1 along the thickness direction, and the stacked position is welded together. Optionally, laser welding is used.

[0063] The welding process between the connection end of the shunt 4 and the busbar of the housing 1: The connection end of the shunt 4 overlaps the upper surface of the busbar of the housing 1. A laser generator is used to emit a laser beam from the lower surface of the busbar of the housing 1 to the upper surface, thereby welding the connection end of the shunt 4 to the overlapping position of the busbar of the housing 1, and forming a second welding trajectory 12 on the lower surface of the busbar of the housing 1, such as... Figure 7 As shown.

[0064] In some embodiments, the shunt 4 has two connection ends, and each connection end can be welded to the busbar of the housing 1 at two locations, so that each connection end and the busbar of the housing 1 will form two second welding tracks 12. By increasing the number of welding positions during the welding process, the connection strength between the connection end of the shunt 4 and the busbar of the housing 1 can be increased. After adopting the above connection welding method, the pull-out force between the connection end of the shunt 4 and the busbar of the housing 1 can be greater than 2000 N·m.

[0065] In an optional embodiment, the thickness of the busbar of housing 1 at the connection point with the splitter 4 is 2mm. This 2mm thickness ensures that the welding power during the welding process between the connection end of the splitter 4 and the busbar of housing 1 will not be too high; a welding power range of 4kW-6kW is recommended. It should be noted that increasing the welding power may cause melting damage to surrounding components and plastic parts, and will also increase the overall cost of the welding equipment.

[0066] The following combination Figure 8 and Figure 9 The connection method between fuse 3 and the busbar of housing 1 is explained.

[0067] like Figure 8 As shown, the fuse 3 is welded to the busbar of the housing 1. Optionally, the fuse 3 and the busbar of the housing 1 are connected by overlapping welding.

[0068] In some embodiments, the fuse 3 includes a fuse body 31 and a contact blade 32.

[0069] The contact 32 is exposed outside the fuse body 31 and is used for electrical connection with other structures. Optionally, the contact 32 is a busbar structure. Therefore, it is simpler and more feasible to weld the contact 32 to the busbar of the housing 1. Optionally, the contact 32 and the busbar of the housing 1 are laser welded.

[0070] During the welding process between the contact 32 of fuse 3 and the busbar of housing 1: the contact 32 of fuse 3 overlaps the upper surface of the busbar of housing 1. A laser generator is used to emit a laser beam from the lower surface of the busbar of housing 1 to the upper surface, thereby welding the contact 32 of fuse 3 to the overlapping position of the busbar of housing 1, forming a third welding trajectory 13 on the lower surface of the busbar of housing 1. Figure 9 As shown.

[0071] Optionally, during the welding process between the contact blade 32 and the busbar of the housing 1, welding can be performed at two locations within the overlap range of the contact blade 32 and the busbar of the housing 1, so that the overlap positions of the contact blade 32 and the busbar of the housing 1 form two third welding tracks 13. By increasing the number of welding positions during the welding process, the connection strength between the contact blade 32 of the fuse 3 and the busbar of the housing 1 can be increased. After adopting the above connection welding method, the pull-out force between the contact blade 32 of the fuse 3 and the busbar of the housing 1 can be greater than 2000 N·m.

[0072] In some embodiments, the contact blade 32 has a thickness of 4 mm, and the thickness of the busbar of the housing 1 at the connection point with the contact blade 32 is 2 mm. The 2 mm thickness of the busbar of the housing 1 at the connection point with the contact blade 32 ensures that the welding power during the welding process between the contact blade 32 of the fuse 3 and the busbar of the housing 1 will not be too high; a recommended welding power range is 4 kW to 6 kW.

[0073] Combination Figure 10 and Figure 11 The connection method between the conductive component 5 and the busbar of the housing 1 is explained.

[0074] like Figure 10 As shown, the conductive component 5 includes, but is not limited to, connecting copper busbars. The shape and size of the connecting copper busbars can be set according to different needs. The conductive component 5 can ensure the connection of the circuit of the power distribution unit.

[0075] In some embodiments, the connecting copper busbar is welded to the busbar of the housing 1. Optionally, the connecting copper busbar and the busbar of the housing 1 are connected by lap welding. Specifically, laser welding can be used.

[0076] During the welding process between the connecting copper busbar and the busbar of housing 1: the connecting copper busbar overlaps the upper surface of the busbar of housing 1. A laser generator is used to emit a laser beam from the lower surface of the busbar of housing 1 to the upper surface, thereby welding the overlapping position of the connecting copper busbar and the busbar of housing 1 together, forming a fourth welding trajectory 14 on the lower surface of the busbar of housing 1. Figure 11 As shown.

[0077] Optionally, during the welding process of the connecting copper busbar and the busbar of the housing 1, welding can be performed at two locations within the overlap range of the connecting copper busbar and the busbar of the housing 1, so that two fourth welding tracks 14 are formed at the overlap of the connecting copper busbar and the busbar of the housing 1. By increasing the number of welding positions during the welding process, the connection strength between the connecting copper busbar and the busbar of the housing 1 can be increased. After adopting the above connection welding method, the pull-out force of the connecting copper busbar and the busbar of the housing 1 can be greater than 2000 N·m.

[0078] In some embodiments, the thickness of the busbar of the housing 1 at the location where it is connected to the connecting copper busbar is 2mm, so as to ensure that the welding power during the welding process between the connecting copper busbar and the busbar of the housing 1 is not too high. The recommended welding power range is 4kw-6kw.

[0079] As described above, the power distribution unit disclosed in this application inserts the contacts 21 of the relay 2 into the lower surface of the busbar of the housing 1, allowing the heat-conducting pad 6 to directly cool and reduce the contact of the relay 2, significantly improving the cooling effect of the power distribution unit. Furthermore, the components of the power distribution unit and the busbar of the housing 1 are all welded, eliminating the need for threaded connections. The single-point welding time for both splicing and overlapping welding is less than 1 second, while the single-point time for screw connections is 5-10 seconds. For a screw connection, the bolt assembly time is estimated to be 5*13=65 seconds, while the welding solution only requires 13 seconds. Therefore, the overall production rate is significantly improved, and the cost of using threaded components is reduced. Additionally, welding the components of the power distribution unit to the busbar of the housing 1 also solves the problem of un-twisting caused by threaded connections, ensuring connection stability and preventing loosening due to vibration. Moreover, during the assembly of components using threaded connections, installation tolerances occur, and the accumulation of these tolerances increases the resistance between the components and the busbar. Welding reduces these installation tolerances.

[0080] In this embodiment, by changing the electrical connection of each component from screw connection to welding, the contact resistance between the component and the busbar of the housing 1 can be reduced from 50μΩ to 5μΩ, which greatly reduces the contact resistance of the BDU circuit and can improve the durability and reliability of the components in the supercharging scheme.

[0081] Furthermore, this invention also discloses a power battery for a vehicle, including a power distribution unit, wherein the power distribution unit is the power distribution unit disclosed in the above embodiments. Therefore, the power battery having this power distribution unit also has all the above-mentioned technical effects, which will not be repeated here.

[0082] In addition, this invention also discloses a vehicle including a power battery, wherein the power battery is the power battery disclosed in the above embodiments. Therefore, the vehicle with the power battery also has all the above-mentioned technical effects, which will not be repeated here.

[0083] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power distribution unit for a power battery, characterized in that, include: A housing (1) having a busbar integrated thereon; A relay (2), wherein the contacts (21) of the relay (2) are welded to the busbar, and the contacts (21) of the relay (2) penetrate the thickness direction of the busbar; A thermal pad (6) is arranged along the thickness direction of the busbar and the housing (1). The thermal pad (6) is arranged on the lower surface of the busbar and is attached to the lower surface of the busbar along the thickness direction. The thermal pad (6) is in contact with the contact (21) of the relay (2).

2. The power distribution unit of the power battery according to claim 1, characterized in that, The contacts (21) of the relay (2) have a stepped structure, and the cross-sectional dimension of the section near the busbar is larger than the cross-sectional dimension of the section away from the busbar. The busbar of the housing (1) has a through hole, which engages with a section of the contact (21) of the relay (2) near the busbar. The through hole is welded to the section of the contact (21) near the busbar.

3. The power distribution unit of the power battery according to claim 2, characterized in that, The contact (21) includes a first segment (211) and a second segment (212), wherein the first segment (211) is away from the busbar and the second segment (212) is close to the busbar; When the through hole mates with the second segment (212), and the surface of the first segment (211) near the second segment (212) abuts against the upper surface of the through hole along the thickness direction of the busbar, the surface of the second segment (212) away from the first segment (211) is flush with the lower surface of the through hole along the thickness direction of the busbar.

4. The power distribution unit of the power battery according to claim 3, characterized in that, The inner wall of the through hole is welded to the outer surface of the second section (212) in the circumferential direction; The upper surface of the busbar along the thickness direction is welded to the stepped surfaces of the first segment (211) and the second segment (212).

5. The power distribution unit of the power battery according to any one of claims 1 to 4, characterized in that, Also includes: A fuse (3) includes a contact (31) for electrical connection; The contact blade (31) is welded to the busbar of the housing (1).

6. The power distribution unit of the power battery according to claim 5, characterized in that, The contact blade (31) overlaps the upper surface of the busbar along the thickness direction, and the overlapping position of the contact blade (31) and the busbar is welded by laser.

7. The power distribution unit of the power battery according to any one of claims 1 to 4, characterized in that, Also includes: A shunt (4) includes a connection terminal for electrical connection; The connecting end is welded to the busbar of the housing (1).

8. The power distribution unit of the power battery according to claim 7, characterized in that, The connection end of the splitter (4) overlaps the upper surface of the busbar along the thickness direction, and the position where the connection end overlaps with the busbar is welded by laser welding.

9. The power distribution unit of the power battery according to any one of claims 1 to 4, characterized in that, Also includes: The conductive component (5) is welded to the busbar of the housing (1).

10. The power distribution unit of the power battery according to claim 9, characterized in that, The conductive element (5) overlaps the upper surface of the busbar along the thickness direction, and the overlapping position of the conductive element (5) and the busbar is welded by laser welding.

11. The power distribution unit of the power battery according to any one of claims 1 to 4, characterized in that, The housing (1) and the busbar are injection molded as an integral structure.

12. A power battery for a vehicle, comprising a power distribution unit, characterized in that, The power distribution unit is the power distribution unit as described in any one of claims 1 to 11.

13. A vehicle, comprising a power battery, characterized in that, The power battery is the power battery as described in claim 12.

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