PDU heat dissipation shell, PDU device and vehicle

Abstract

The invention discloses a PDU heat dissipation shell, a PDU device and a vehicle, and relates to the technical field of PDU devices. The PDU heat dissipation shell comprises a PDU box body and a flow channel cover plate, a relay and a connecting copper bar are installed in the PDU box body, the flow channel cover plate covers the lower surface of the PDU box body in a sealing mode, a heat dissipation cavity is formed between the flow channel cover plate and the PDU box body, the PDU box body is provided with a liquid inlet and a liquid outlet, the liquid inlet is used for conveying cooling liquid into the heat dissipation cavity, and the liquid outlet is used for conveying cooling liquid into the heat dissipation cavity. The liquid outlet is used for discharging the cooling liquid in the heat dissipation cavity, and the cooling liquid in the heat dissipation cavity can dissipate heat of the PDU box body. According to the PDU heat dissipation shell, the cooling liquid in the heat dissipation cavity dissipates heat of the PDU box body, and then the temperature in the PDU box body is reduced, so that the ablation risk caused by too high temperature in the PDU box body is avoided, the probability of damage of the relay caused by a high-temperature environment is reduced, and the service life of the relay is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of PDU devices, and particularly relates to a PDU heat dissipation housing, a PDU device, and a vehicle. Background Art

[0002] A PDU (Power Distribution Unit), a high-voltage power distribution box, is composed of many high-voltage relays and connecting copper bars, and can manage the high-voltage power distribution of the whole vehicle, realize the separate control of each output, manage the high-voltage safety, and has over-current, over-voltage, and over-temperature protection functions. It is a high-voltage power distribution unit in the new energy vehicle high-voltage system solution.

[0003] With the increase of the vehicle charging current, the relays and connecting copper bars inside the PDU device generate more and more heat during operation. Moreover, the PDU device is in a relatively sealed environment, resulting in ineffective heat dissipation, which easily leads to the risk of ablation. In addition, the relays inside the PDU device are prone to damage or reduced service life when working in a high-temperature environment for a long time. Therefore, it is necessary to provide a PDU heat dissipation housing that can dissipate heat from the PDU device. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in view of the poor heat dissipation of the existing PDU device, to provide a PDU heat dissipation housing, a PDU device, and a vehicle.

[0005] To solve the above problems, on the one hand, an embodiment of the present invention provides a PDU heat dissipation housing, including a PDU box body and a flow channel cover plate. The PDU box body is used to install relays and connecting copper bars. The flow channel cover plate is hermetically covered on the lower surface of the PDU box body. A heat dissipation cavity is formed between the flow channel cover plate and the PDU box body. The PDU box body is provided with a liquid inlet and a liquid outlet. The liquid inlet is used to convey coolant into the heat dissipation cavity, and the liquid outlet is used to discharge the coolant in the heat dissipation cavity. The coolant in the heat dissipation cavity can dissipate heat from the PDU box body.

[0006] As a further improvement of the above technical solution: Optionally, the heat dissipation cavity is recessed from the lower surface of the PDU box body.

[0007] Optionally, a partition member is provided in the heat dissipation cavity, and the partition member divides the heat dissipation cavity into a heat dissipation flow channel connecting the liquid inlet and the liquid outlet.

[0008] Optionally, an installation groove is provided on the lower surface of the PDU box body and / or the upper surface of the flow channel cover plate, and the partition member is limitedly installed in the installation groove.

[0009] Optionally, the separator is a flexible pad, and the flexible pad is in sealing abutment with the lower surface of the PDU box body and the upper surface of the flow channel cover plate respectively.

[0010] Optionally, spoiler columns are provided in the heat dissipation cavity.

[0011] Optionally, the spoiler columns are provided at positions in the heat dissipation cavity close to the liquid inlet and the liquid outlet.

[0012] Optionally, the flow channel cover plate is hermetically covered on the lower surface of the PDU box body through a sealing ring.

[0013] On the other hand, an embodiment of the present invention provides a PDU device, including a relay, a connecting copper bar, and the PDU heat dissipation housing as described above. The relay and the connecting copper bar are both installed in the PDU box body.

[0014] As a further improvement of the above technical solution: Optionally, the relay is attached and installed at the bottom of the PDU box body, and a heat conducting pad is provided between the connecting copper bar and the bottom of the PDU box body.

[0015] Optionally, the relay includes a DC charging positive relay, a DC charging negative relay, and a boost relay, and the connecting copper bar includes a connecting copper bar one, a connecting copper bar two, a connecting copper bar three, a connecting copper bar four, a connecting copper bar five, a connecting copper bar six, a connecting copper bar seven, and a connecting copper bar eight.

[0016] On yet another aspect, an embodiment of the present invention provides a vehicle, including a battery pack, a driving mechanism, and the PDU device as described above. The PDU device is electrically connected to the battery pack and the driving mechanism respectively.

[0017] A PDU heat dissipation housing, a PDU device, and a vehicle provided by an embodiment of the present invention have at least the following beneficial effects compared with the prior art: When in use, the relay and the connecting copper bar are installed in the PDU heat dissipation housing. When the relay and the connecting copper bar are working, an external pumping mechanism conveys the coolant into the heat dissipation cavity through the liquid inlet and discharges the coolant in the heat dissipation cavity through the liquid outlet. The coolant in the heat dissipation cavity dissipates heat from the PDU box body, thereby reducing the temperature in the PDU box body, avoiding the risk of ablation caused by too high temperature in the PDU box body, and reducing the probability of damage to the relay due to the high temperature environment, and prolonging the service life of the relay. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the accompanying drawings required for the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of a PDU heat dissipation housing provided in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a PDU device provided in an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a fast charging circuit of a PDU device provided in an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a boost charging circuit of a PDU device provided in an embodiment of the present invention; Figure 5 It is an exploded view of a PDU device provided in an embodiment of the present invention.

[0020] The reference numerals in the specification are as follows: 100 - PDU heat dissipation housing, 110 - PDU box, 111 - liquid inlet, 112 - liquid outlet, 113 - installation groove, 120 - flow channel cover plate, 130 - partition member, 140 - flow disturbance column, 150 - sealing ring, 200 - PDU device, 210 - DC charging positive relay, 220 - DC charging negative relay, 230 - boost relay, 241 - connecting copper bar one, 242 - connecting copper bar two, 243 - connecting copper bar three, 244 - connecting copper bar four, 245 - connecting copper bar five, 246 - connecting copper bar six, 247 - connecting copper bar seven, 248 - connecting copper bar eight, 250 - charging connector, 260 - battery pack connector, 270 - rear drive connector. Specific Embodiments

[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the 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 should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] As Figure 1 shown, an embodiment of the present invention provides a PDU heat dissipation housing 100, which includes a PDU box body 110 and a flow channel cover plate 120. The PDU box body 110 is used for installing relays and connecting copper bars. The flow channel cover plate 120 is hermetically covered on the lower surface of the PDU box body 110. A heat dissipation cavity is formed between the flow channel cover plate 120 and the PDU box body 110. The PDU box body 110 is provided with a liquid inlet 111 and a liquid outlet 112. The liquid inlet 111 is used for delivering a coolant into the heat dissipation cavity, and the liquid outlet 112 is used for discharging the coolant in the heat dissipation cavity. The coolant in the heat dissipation cavity can dissipate heat from the PDU box body 110.

[0025] During use, the relays and connecting copper bars are installed in the PDU heat dissipation housing 100. When the relays and connecting copper bars are working, they generate a large amount of heat. The external pumping mechanism delivers the coolant into the heat dissipation cavity through the liquid inlet 111 and discharges the coolant in the heat dissipation cavity through the liquid outlet 112. The coolant in the heat dissipation cavity dissipates heat from the PDU box body 110, thereby reducing the temperature inside the PDU box body 110, avoiding the risk of ablation caused by excessive temperature inside the PDU box body 110, and reducing the probability of damage to the relays due to the high-temperature environment, and prolonging the service life of the relays.

[0026] In a specific embodiment, an external rotor pump delivers cooling water to the heat dissipation cavity through the liquid inlet 111. The cooling water entering the heat dissipation cavity flows from the liquid inlet 111 to the liquid outlet 112 under the action of the pumping pressure, and is finally discharged from the heat dissipation cavity through the liquid outlet 112. The cooling water in the heat dissipation cavity dissipates heat for the PDU box 110, thereby reducing the temperature in the PDU box 110, thereby avoiding the risk of ablation caused by excessive temperature in the PDU box 110, reducing the probability of damage to the relay due to high temperature environment, and extending the service life of the relay.

[0027] In one embodiment, if Figure 1 As shown, the heat dissipation cavity is recessed in the lower surface of the PDU box 110. That is, the flow channel cover plate 120 is flush with the lower surface of the PDU box 110, so that the lower surface of the PDU box 110 does not bulge outward, so that the shape of the PDU box 110 is consistent with the shape of the ordinary PDU box 110, avoiding the installation of the PDU box 110 affected by the difference in shape. And the heat dissipation cavity is recessed in the lower surface of the PDU box 110, which can increase the heat exchange area between the PDU box 110 and the heat dissipation cavity, and further facilitate the coolant in the heat dissipation cavity to dissipate heat from the PDU box 110. In a specific embodiment, the heat dissipation cavity is a rectangular parallelepiped structure recessed in the lower surface of the PDU box 110.

[0028] The PDU heat dissipation housing 100 provided in the embodiment of the present invention is further configured as follows: Figure 1 As shown, a partition 130 is provided in the heat dissipation cavity, and the partition 130 divides the heat dissipation cavity into a heat dissipation channel connecting the liquid inlet 111 and the liquid outlet 112. The partition 130 divides the heat dissipation cavity into a heat dissipation channel connecting the liquid inlet 111 and the liquid outlet 112, so as to prevent the coolant from entering the heat dissipation cavity from the liquid inlet 111 and then directly flowing out of the heat dissipation cavity from the liquid outlet 112, thereby increasing the residence time of the coolant in the heat dissipation cavity, thereby improving the cooling efficiency of the coolant.

[0029] The partition 130 divides the heat dissipation cavity into a heat dissipation channel connecting the liquid inlet 111 and the liquid outlet 112, so that the coolant entering the heat dissipation cavity from the liquid inlet 111 can flow through various places in the heat dissipation cavity. The coolant can cool various places in the heat dissipation cavity, thereby improving the cooling effect and efficiency of the coolant.

[0030] In one embodiment, if Figure 1As shown, the lower surface of the PDU box 110 and the upper surface of the flow channel cover plate 120 are both provided with a mounting groove 113, and the partition 130 is limitedly installed in the mounting groove 113. The mounting groove 113 can provide a mounting position for the partition 130 to prevent the partition 130 from moving randomly in the heat dissipation cavity. Random movement of the partition 130 in the heat dissipation cavity may result in isolation of the heat dissipation flow channel, so that the coolant in the heat dissipation cavity cannot flow out from the liquid outlet 112, thereby affecting the heat dissipation of the PDU box 110.

[0031] The lower surface of the PDU box 110 and the upper surface of the flow channel cover plate 120 are both provided with mounting grooves 113, which can limit the partition 130 from the upper and lower positions respectively, thereby improving the limiting firmness of the partition 130. Of course, it is understandable that the mounting grooves 113 can also be provided on the lower surface of the PDU box 110 or the upper surface of the flow channel cover plate 120, and the partition 130 can be limited from the upper or lower positions respectively, and the partition 130 can also be installed in a limited position, but compared with the technical solution in which the mounting grooves 113 are provided on the lower surface of the PDU box 110 and the upper surface of the flow channel cover plate 120, the limiting firmness of the partition 130 of this technical solution is poor.

[0032] In a specific embodiment, the separator 130 is a flexible pad, which is respectively sealed against the lower surface of the PDU box 110 and the upper surface of the flow channel cover 120. Preferably, the flexible pad is a rubber pad, and the upper and lower surfaces of the rubber pad are squeezed and respectively sealed against the lower surface of the PDU box 110 and the upper surface of the flow channel cover 120.

[0033] The PDU heat dissipation housing 100 provided in the embodiment of the present invention is further configured as follows: Figure 1 As shown, a spoiler column 140 is provided in the heat dissipation cavity. In this embodiment, spoiler columns 140 are provided in the heat dissipation cavity at positions near the liquid inlet 111 and the liquid outlet 112. The coolant flow flowing into the heat dissipation channel through the liquid inlet 111 will first contact the spoiler column 140, so the spoiler column 140 will break up the coolant flow, and the broken coolant flow will flow through the heat dissipation channel. Since the broken coolant flow has better fluidity, the coolant flow flowing through the heat dissipation channel can take away heat more quickly, thereby improving the heat dissipation efficiency.

[0034] Preferably, the coolant flowing into the heat dissipation channel through the liquid inlet 111 will first contact the spoiler column 140, so different arrangements of the spoiler column 140 will produce different water flow dispersion effects. In order to achieve a better water flow dispersion effect, Figure 1 As shown, a preferred implementation may be that a plurality of spoiler columns 140 are arranged in at least two linear directions.

[0035] This arrangement enables multiple turbulator columns 140 to be arranged in different linear directions, so that when the coolant flows through the turbulator columns 140, different forms of dispersion effects will be generated, making the coolant flow more chaotic and avoiding the situation where the coolant flow is dispersed in the same direction, resulting in an insignificant increase in the fluidity of the coolant flow.

[0036] It should be noted that there are various situations where the turbulator columns 140 are arranged at least in two linear directions. For example, the turbulator columns 140 can be arranged on two parallel straight lines, or the turbulator columns 140 can be arranged on two lines with only one intersection point (such as V-shaped, T-shaped, etc.), or the turbulator columns 140 can be arranged on two intersecting straight lines (such as X-shaped, cross-shaped, etc.).

[0037] Specifically, the PDU heat dissipation housing 100 provided in the embodiment of the present invention is as Figure 1 shown. The flow channel cover plate 120 is hermetically covered on the lower surface of the PDU box body 110 through the sealing ring 150. The sealing ring 150 can strengthen the sealing performance between the flow channel cover plate 120 and the PDU box body 110, thereby preventing the coolant in the heat dissipation cavity from flowing out through the gap between the flow channel cover plate 120 and the PDU box body 110. In this embodiment, the sealing ring 150 is a rubber sealing ring 150. An annular limiting groove is provided on the upper surface of the flow channel cover plate 120 and / or the lower surface of the PDU box body 110, and the sealing ring 150 is installed in the limiting groove in a limited manner. The sealing ring 150 is squeezed so that its upper and lower surfaces are respectively in sealing contact with the upper surface of the flow channel cover plate 120 and the lower surface of the PDU box body 110.

[0038] In addition, another embodiment of the present invention provides a PDU device 200, as Figure 2 and Figure 5 shown. The PDU device 200 includes a relay, a connecting copper bar, and the PDU heat dissipation housing 100 provided in any of the above embodiments. The relay and the connecting copper bar are both installed in the PDU box body 110. The specific structure of the PDU box body 110 refers to the above embodiments. Since the PDU device 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0039] The PDU device 200 provided by the embodiment of the present invention. Further, the relay is attached and installed at the bottom of the PDU box 110, and a heat conduction pad is provided between the connection busbar and the bottom of the PDU box 110. The relay is attached and installed at the bottom of the PDU box 110, and the coolant is used to take away the heat. A heat conduction pad is added to the bottom of the connection busbar, and the heat conduction pad is attached to the heat dissipation cavity to conduct heat, which is beneficial to improving the heat dissipation efficiency. In this embodiment, the relay includes a DC charging positive relay 210, a DC charging negative relay 220, and a boost relay 230. The connection busbars include a connection busbar one 241, a connection busbar two 242, a connection busbar three 243, a connection busbar four 244, a connection busbar five 245, a connection busbar six 246, a connection busbar seven 247, and a connection busbar eight 248.

[0040] In a specific embodiment, as Figure 3 shown, during fast charging (when the external charging pile voltage meets the battery pack charging voltage): the DC charging positive relay 210 and the DC charging negative relay 220 are closed, the DC fast charging circuit conducts a current of 400 A, and the DC charging positive relay 210, the DC charging negative relay 220, the connection busbar one 241, the connection busbar two 242, the connection busbar three 243, and the connection busbar four 244 generate heat.

[0041] As Figure 4 shown, during boost charging (when the external charging pile voltage is lower than the battery pack voltage): the boost relay 230 and the DC charging negative relay 220 are closed, the boost charging circuit conducts a current of 400 A, and the boost relay 230, the DC charging negative relay 220, the connection busbar one 241, the connection busbar two 242, the connection busbar three 243, the connection busbar four 244, the connection busbar five 245, the connection busbar six 246, and the connection busbar eight 248 generate heat.

[0042] Furthermore, another embodiment of the present invention provides a vehicle, which includes a battery pack, a driving mechanism, and the PDU device 200 provided in any of the above embodiments. The PDU device 200 is electrically connected to the battery pack and the driving mechanism respectively. The specific structure of the PDU device 200 refers to the above embodiments. Since this vehicle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0043] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A PDU heat dissipation housing, characterized in that: It includes a PDU box and a flow channel cover plate, wherein the PDU box is used to install relays and connect copper bars, the flow channel cover plate sealing cover is arranged on the lower surface of the PDU box, a heat dissipation cavity is formed between the flow channel cover plate and the PDU box, and the PDU box is provided with a liquid inlet and a liquid outlet, the liquid inlet is used to transport coolant into the heat dissipation cavity, and the liquid outlet is used to discharge the coolant in the heat dissipation cavity, and the coolant in the heat dissipation cavity can dissipate the heat of the PDU box.

2. The PDU heat dissipation housing according to claim 1, characterized in that: The heat dissipation cavity is recessed in the lower surface of the PDU box.

3. The PDU heat dissipation housing according to claim 1, characterized in that: A partition is provided in the heat dissipation cavity, and the partition divides the heat dissipation cavity into a heat dissipation channel communicating with the liquid inlet and the liquid outlet.

4. The PDU heat dissipation housing according to claim 3, characterized in that: The lower surface of the PDU box body and / or the upper surface of the flow channel cover plate are provided with an installation groove, and the partition is limitedly installed in the installation groove.

5. The PDU heat dissipation housing according to claim 1, characterized in that: A spoiler column is arranged in the heat dissipation cavity.

6. The PDU heat dissipation housing according to claim 1, characterized in that: The flow channel cover plate is sealed on the lower surface of the PDU box body through a sealing ring.

7. A PDU device, characterized in that: It comprises a relay, a connecting copper busbar and a PDU heat dissipation shell as claimed in any one of claims 1 to 6, wherein the relay and the connecting copper busbar are both installed in the PDU box.

8. The PDU device according to claim 7, characterized in that: The relay is attached to the bottom of the PDU box, and a thermal pad is provided between the connecting copper bar and the bottom of the PDU box.

9. The PDU device according to claim 7, characterized in that: The relays include a DC charging positive relay, a DC charging negative relay and a boost relay, and the connecting copper bar includes connecting copper bar one, connecting copper bar two, connecting copper bar three, connecting copper bar four, connecting copper bar five, connecting copper bar six, connecting copper bar seven and connecting copper bar eight.

10. A vehicle, characterized in that: It comprises a battery pack, a driving mechanism and a PDU device as described in any one of claims 7 to 9, and the PDU device is electrically connected to the battery pack and the driving mechanism respectively.

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