Power distribution devices, battery packs and electrical equipment

Abstract

This application provides a power distribution device, a battery pack, and electrical equipment. The power distribution device includes electrical components and a busbar assembly. The busbar assembly is provided with a heat exchange cavity configured to circulate coolant. The busbar assembly is connected to the electrical components and configured to transmit current to the electrical components and dissipate heat from the electrical components. The power distribution device of this application has excellent heat dissipation performance.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a power distribution device, a battery pack and an electrical device. Background Art

[0002] The Battery Disconnect Unit (BDU) is a key component in the power supply system, used to manage the connection and disconnection between battery components and loads such as motors or power electronic devices.

[0003] In related technologies, the BDU mainly includes devices such as a main positive relay and a fuse. The main positive relay and the fuse are connected through a busbar. The main positive relay is used to connect and disconnect the circuit between the battery assembly and the load. The fuse is used to melt when the current is too large to protect the circuit.

[0004] When the BDU is working, the main positive relay, fuse, busbar, etc. need to transmit a large current, which causes the BDU to heat up seriously. Therefore, it is urgent to improve the heat dissipation performance of the BDU. Summary of the Invention

[0005] Based on this, the present application provides a power distribution device, a battery pack and an electrical equipment to address the deficiencies in the related art.

[0006] In a first aspect, the present application provides a power distribution device, comprising:

[0007] electrical components;

[0008] The busbar assembly is provided with a heat exchange cavity, which is configured to allow coolant to circulate. The busbar assembly is connected to the electrical assembly and configured to transmit current to the electrical assembly and dissipate heat for the electrical assembly.

[0009] In a possible implementation, the busbar assembly is provided with a liquid inlet and a liquid outlet, both of which are communicated with the heat exchange cavity, and the liquid inlet and the liquid outlet are constructed to be connected to the coolant circulation device.

[0010] In one possible implementation, at least one guide rib is provided in the heat exchange chamber, and the at least one guide rib divides the heat exchange chamber into at least two sub-cavities, and the at least two sub-cavities are connected to each other, one sub-cavity is connected to the liquid inlet, and the other sub-cavity is connected to the liquid outlet.

[0011] In a possible implementation, the electrical assembly includes at least two electrical components, and an input end of one of the at least two electrical components is electrically connected to an output end of the other electrical component via a busbar assembly.

[0012] In one possible implementation, the busbar assembly includes at least three conductive bars and at least two insulating bars, the conductive bars and the insulating bars are arranged alternately, and the insulating bars connect two adjacent conductive bars to insulate the two adjacent conductive bars, and the conductive bars are electrically connected to the electrical components;

[0013] The heat exchange cavity passes through all the conductive bars and all the insulating bars.

[0014] In a possible implementation, the liquid inlet and the liquid outlet are both located on the same insulation bar, and the liquid inlet and the liquid outlet are located on opposite sides of the insulation bar.

[0015] In a possible implementation, two adjacent ones of the at least three conductive bars and the at least two insulating bars are welded.

[0016] In a possible implementation, the conductive bus is made of at least one of copper and aluminum, and the insulating bus is made of ceramic.

[0017] In a possible implementation, in two adjacent conductive bars, ends of the two conductive bars facing each other are plugged into adjacent insulating bars.

[0018] In a possible implementation, the at least three conductive bars include a first conductive bar and two second conductive bars, the two second conductive bars are located at both ends of the first conductive bar, and the insulating bar connects the adjacent first conductive bar and the second conductive bar;

[0019] The at least two electrical components include a first component and a second component, one second conductive bar is electrically connected to the first component, another second conductive bar is electrically connected to the second component, and the first conductive bar is electrically connected to both the first component and the second component.

[0020] In a possible implementation, the first conductive bar has a first cavity, the second conductive bar has a second cavity, and the insulating bar has a third cavity;

[0021] The first cavity, the second cavity and the third cavity are interconnected to form a heat exchange cavity.

[0022] In a possible implementation, two first connecting bars are further included, the first conductive bar is electrically connected to the first device via one first connecting bar, and the first conductive bar is electrically connected to the second device via the other first connecting bar.

[0023] In one possible implementation, the first connecting bar includes a first connecting wall, a second connecting wall, and a third connecting wall connected in sequence, the second connecting wall is located between the first conductive bar and the electrical component, and the second connecting wall is fixedly connected to the electrical component;

[0024] The first connecting wall and the third connecting wall are located on two opposite sides of the second conductive bar, and both the first connecting wall and the third connecting wall are fixedly connected to the first conductive bar.

[0025] In one possible implementation, the power distribution device further includes two second connecting bars, which are arranged in a one-to-one correspondence with the second conductive bars, one second conductive bar is electrically connected to the first device through the corresponding second connecting bar, and the other second conductive bar is electrically connected to the second device through the corresponding second connecting bar.

[0026] In a possible implementation, the second connecting bar includes a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to a side of the second connecting portion facing away from the first conductive bar;

[0027] The first connection portion is configured to be connected to an external circuit, and the second connection portion is configured to electrically connect the second conductive bar and the electrical component.

[0028] In one possible implementation, the second connecting portion includes a fourth connecting wall, a fifth connecting wall, and a sixth connecting wall that are sequentially connected, the fifth connecting wall is located between the second conductive bar and the electrical component, and the fifth connecting wall is fixedly connected to the electrical component;

[0029] The fourth connecting wall and the sixth connecting wall are located on two opposite sides of the second conductive bar, and both the fourth connecting wall and the sixth connecting wall are fixedly connected to the second conductive bar.

[0030] In a possible implementation, the busbar assembly further includes two blocking members, and both ends of the second cavity are open;

[0031] The blocking piece is connected to the end of the second conductive row facing away from the insulating row to block the end of the second cavity facing away from the insulating row.

[0032] In a possible implementation, one of the first component and the second component is a fuse, and the other is a relay.

[0033] In a second aspect, the present application provides a battery pack, comprising a battery assembly and the power distribution device provided in the first aspect above, wherein the power distribution device is electrically connected to the battery assembly.

[0034] In a third aspect, the present application provides an electrical device, comprising the power distribution device provided in the first aspect above, or the battery pack provided in the second aspect above.

[0035] The embodiments of the present application provide a power distribution device, a battery pack, and electrical equipment, wherein the power distribution device includes electrical components and busbar components, and the busbar components include a heat exchange chamber. By arranging the electrical components, the power distribution device can realize the function of managing the circuit between the battery components and the electrical devices. By arranging the busbar components for connecting the electrical components and the external circuit, the current is transmitted between the battery components, the power distribution device, and the electrical devices. By arranging the heat exchange chamber for circulating the coolant, the coolant is used to dissipate heat for the busbar components and the electrical components. Since the heat exchange between the electrical components and the coolant can be transferred to the busbar components in one step, the heat transfer path between the electrical components and the coolant is shortened, thereby improving the heat dissipation effect of the power distribution device.

[0036] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the power distribution device, battery pack and electrical equipment provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 A schematic diagram of the structure of the power distribution device provided in an embodiment of the present application;

[0039] Figure 2 for Figure 1 A magnified view of the middle part;

[0040] Figure 3 A schematic structural diagram of a busbar assembly in a power distribution device provided in an embodiment of the present application;

[0041] Figure 4 for Figure 3 perspective drawing;

[0042] Figure 5 A schematic diagram of the internal structure of a busbar assembly in a power distribution device provided in an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 100-electrical component; 110-electrical component; 111-first device; 112-second device; 113-pre-charged module; 200-busbar assembly; 200a-heat exchange cavity; 200b-liquid inlet; 200c-liquid outlet; 200d-guiding rib; 210-conductive bar; 211-first conductive bar; 2111-first cavity; 212-second conductive bar; 2121-second cavity; 220-insulating bar; 221-third cavity; 230-sealing part; 300-first connecting bar; 310-first connecting wall; 320-second connecting wall; 330-third connecting wall; 400-second connecting bar; 410-first connecting part; 420-second connecting part; 421-fourth connecting wall; 422-fifth connecting wall; 423-sixth connecting wall; 500-housing; 600-circuit board. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing this application 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 understood as a limitation on this application.

[0048] The terms "first," "second," and "third" (if any) in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0049] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0050] In the related art, the BDU mainly includes components such as the main positive relay and fuses, which are connected through a busbar. The main positive relay is used to connect and disconnect the circuit between the battery assembly and the load, and the fuse is used to melt when the current is too large to protect the circuit. Since the main positive relay, fuse, busbar, etc. need to transmit a large current when the BDU is working, the BDU will heat up more seriously. Since the heat of the heating device is transferred to the busbar, the busbar then transfers the heat to the coolant in the liquid cold plate through the insulating film and thermal pad. This heat dissipation method has a long heat transfer path, and the thermal conductivity of the insulating film and thermal pad is low, which leads to poor heat dissipation effect of the BDU.

[0051] In view of this, an embodiment of the present application provides a power distribution device, a battery pack and electrical equipment. The power distribution device is provided with a busbar assembly, and a heat exchange cavity is provided in the busbar assembly for the flow of coolant, so that the electrical components exchange heat with the coolant through the busbar assembly, so that the heat of the electrical components and the busbar assembly is taken away by the coolant, and the heat transfer path between the electrical components and the coolant is short, thereby improving the heat dissipation effect of the power distribution device.

[0052] The specific implementation methods of the power distribution device, battery pack and electrical equipment provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0053] Reference Figure 1 As shown, an embodiment of the present application provides an electric device, which includes an electric device and a battery pack, wherein the battery pack is used to power the electric device. Alternatively, the electric device includes a power distribution device and an electric device, wherein the power distribution device is used to manage the charging and discharging of the electric device.

[0054] For example, the electrical equipment may be a vehicle, the electrical device may be an electric motor, and the battery pack may provide electrical energy to the electric motor, thereby driving the vehicle. The vehicle may be a pure electric vehicle, an extended-range electric vehicle, a hybrid electric vehicle, or any other vehicle equipped with a battery pack, which is not limited in this embodiment.

[0055] Alternatively, the electrical equipment may also be ships, aircraft, electronic terminal equipment, electrical equipment, energy storage equipment, etc., which will not be described one by one here.

[0056] Reference Figure 1 As shown, based on the above embodiment, an embodiment of the present application further provides a battery pack, which may include a battery assembly and a power distribution device, which is electrically connected to the battery assembly. The power distribution device is used to control the connection and disconnection of the circuit between the battery assembly and the power consumption device to pre-charge the input capacitor of the power consumption device and prevent inrush current from damaging the power consumption device. The power distribution device can also quickly disconnect the circuit when a fault (such as a short circuit, overtemperature, overvoltage, etc.) is detected, providing safety isolation to prevent further damage.

[0057] Reference Figures 1 to 4 As shown, based on the above embodiments, the embodiments of the present application further provide a power distribution device, which includes an electrical component 100 and a busbar component 200. The busbar component 200 is provided with a heat exchange cavity 200a, and the heat exchange cavity 200a is configured for circulation of coolant. The busbar component 200 is connected to the electrical component 100 and is configured to transmit current of the electrical component 100 and dissipate heat for the electrical component 100.

[0058] In this embodiment, the electrical assembly 100 is used to connect and disconnect the circuit between the battery assembly and the load of the electrical device. The electrical assembly 100 can also be used to fuse in the event of overvoltage, short circuit, or overtemperature to protect the circuit. The electrical assembly 100 can also pre-charge the input capacitor of the electrical device. In short, the electrical assembly 100 enables the power distribution device to perform its function of managing the circuit between the battery assembly and the electrical device.

[0059] The busbar assembly 200 can electrically connect the various electrical components 110 of the electrical assembly 100, thereby allowing current to be transmitted between the various electrical components 110, and the busbar assembly 200 can also be connected to an external circuit, thereby allowing the distribution device to be connected to the external circuit, so that current can be transmitted between the battery assembly, the distribution device and the electrical device.

[0060] Since the busbar assembly 200 is provided with a heat exchange cavity 200a, the coolant can circulate in the heat exchange cavity 200a, so that the coolant can exchange heat with the busbar assembly 200, and then the coolant can exchange heat with the electrical assembly 100 through the busbar assembly 200, so that the heat of the electrical assembly 100 and the busbar assembly 200 is taken away by the coolant, thereby improving the heat dissipation effect of the distribution device.

[0061] It can be understood that since heat conduction is carried out between the electrical component 100 and the coolant through the busbar assembly 200, the heat of the electrical component 100 can be transferred to the coolant through the busbar assembly 200 in one step, thereby shortening the heat transfer path from the electrical component 100 to the coolant, and the busbar assembly 200 has good thermal conductivity, thereby improving the heat dissipation effect of the electrical component 100.

[0062] The power distribution device of the embodiment of the present application includes an electrical component 100 and a busbar component 200. The busbar component 200 includes a heat exchange chamber 200a. By setting the electrical component 100, the power distribution device can realize the function of managing the circuit between the battery component and the power-consuming device. By setting the busbar component 200 for connecting the electrical component 100 and the external circuit, the current is transmitted between the battery component, the power distribution device and the power-consuming device. By setting the heat exchange chamber 200a for circulating the coolant, the coolant is used to dissipate heat for the busbar component 200 and the electrical component 100. Since the heat exchange between the electrical component 100 and the coolant can be transferred to the point in one step through the busbar component 200, the heat transfer path between the electrical component 100 and the coolant is shortened, thereby improving the heat dissipation effect of the power distribution device.

[0063] In one possible implementation, the busbar assembly 200 is provided with a liquid inlet 200b and a liquid outlet 200c, both of which are connected to the heat exchange cavity 200a, and the liquid inlet 200b and the liquid outlet 200c are constructed to be connected to a coolant circulation device.

[0064] In this way, the coolant circulation device can drive the coolant with a lower temperature to enter the heat exchange chamber 200a from the liquid inlet 200b. The coolant can circulate in the heat exchange chamber 200a to take away the heat of the busbar assembly 200 and the electrical assembly 100, thereby reducing the temperature of the busbar assembly 200 and the electrical assembly 100. After the temperature of the coolant rises, it can return to the coolant circulation device through the liquid outlet 200c to reduce the temperature of the coolant. This reciprocating cycle can enable the coolant to continuously dissipate heat for the busbar assembly 200 and the electrical assembly 100.

[0065] Reference Figure 4As shown, in some embodiments, at least one guide rib 200d is provided in the heat exchange chamber 200a, and the at least one guide rib 200d divides the heat exchange chamber 200a into at least two sub-cavities, and the at least two sub-cavities are connected to each other, one sub-cavity is connected to the liquid inlet 200b, and the other sub-cavity is connected to the liquid outlet 200c.

[0066] In this way, the coolant can circulate evenly in the heat exchange cavity 200 a to improve the heat transfer effect, and the flow rate of the coolant can be controlled to ensure sufficient heat exchange between the coolant and the electrical component 100 .

[0067] Reference Figure 1 As shown, in a possible implementation, the electrical assembly 100 includes at least two electrical components 110 , and an input end of one of the at least two electrical components 110 is electrically connected to an output end of the other through a busbar assembly 200 .

[0068] For example, the electrical component 100 includes two electrical components 110, and the two electrical components 110 can be connected in series through the busbar component 200. The input end of one electrical component 110 constitutes the input end of the electrical component 100, and the input end of the electrical component 100 can be connected to the external circuit through the busbar component 200. The input end of the other electrical component 110 constitutes the output end of the electrical component 100, and the output end of the electrical component 100 can be connected to the external circuit through the busbar component 200. In this way, the busbar component 200 can realize the electrical connection inside the electrical component 100, and connect the electrical component 100 to the external circuit.

[0069] Reference Figures 1 to 3 As shown, in some embodiments, the busbar assembly 200 includes at least three conductive bars 210 and at least two insulating bars 220. The conductive bars 210 and the insulating bars 220 are arranged alternately, and the insulating bars 220 connect two adjacent conductive bars 210 so that the two adjacent conductive bars 210 are insulated. The conductive bars 210 are electrically connected to the electrical components 110, and the heat exchange cavity 200a runs through all the conductive bars 210 and all the insulating bars 220.

[0070] That is to say, since the electrical assembly 100 includes at least two electrical components 110, in order to electrically connect the busbar assembly 200 to the at least two electrical components 110, the busbar assembly 200 needs to be provided with at least three conductive bars 210, so that the at least two electrical components 110 are electrically connected through the three conductive bars 210, and the two electrical components 110 are connected to the external circuit through two of the conductive bars 210.

[0071] Furthermore, in order to insulate the three conductive bars 210 , two adjacent conductive bars 210 need to be connected via an insulating bar 220 . Thus, the busbar assembly 200 includes at least three conductive bars 210 and at least two insulating bars 220 , and the heat exchange cavity 200 a passes through all the conductive bars 210 and all the insulating bars 220 , so that the coolant can perform heat exchange with multiple electrical components 110 through the busbar assembly 200 , thereby allowing the coolant to dissipate heat for each electrical component 110 , thereby improving the heat dissipation effect of the electrical component 100 .

[0072] In some embodiments, the liquid inlet 200 b and the liquid outlet 200 c are both located on the same insulation bar 220 , and the liquid inlet 200 b and the liquid outlet 200 c are located on opposite sides of the insulation bar 220 .

[0073] With this arrangement, the coolant can enter the heat exchange cavity 200a from one side of an insulating row 220, and after fully circulating in the heat exchange cavity 200a, it can flow out of the heat exchange cavity 200a from the other side of an insulating row 220, thereby improving the heat dissipation effect of the distribution device.

[0074] In some embodiments, two adjacent ones of the at least three conductive bars 210 and the at least two insulating bars 220 are welded.

[0075] It is understandable that since the heat exchange chamber 200a passes through all the conductive bars 210 and all the insulating bars 220, the connection between the conductive bars 210 and the insulating bars 220 needs to be sealed to prevent the coolant from leaking from the connection between the conductive bars 210 and the insulating bars 220. Welding between the conductive bars 210 and the insulating bars 220 can ensure the connection strength between the conductive bars 210 and the insulating bars 220 and ensure the sealing performance of the heat exchange chamber 200a.

[0076] For example, the conductive bus 210 and the insulating bus 220 may be brazed.

[0077] In a possible implementation, the conductive bus 210 is made of at least one of copper and aluminum, and the insulating bus 220 is made of ceramic.

[0078] It is understood that copper or aluminum has good electrical and thermal conductivity. Using pure copper, copper alloy, pure aluminum, aluminum alloy, or copper-aluminum composite materials as the material for the conductive bus 210 can enable the conductive bus 210 to effectively transmit current and improve the thermal conductivity between the coolant and the electrical components 110. Ceramics have poor electrical conductivity but good thermal conductivity. Therefore, the insulating bus 220 made of ceramic has good insulation performance, can effectively prevent short circuits between electrical components 110, and improve the thermal conductivity of the busbar assembly 200.

[0079] In some embodiments, in two adjacent conductive bars 210 , ends of the two conductive bars 210 facing each other are plugged into adjacent insulating bars 220 .

[0080] Such a configuration can make the volume of the insulating bar 220 larger than that of the conductive bar 210, thereby improving the insulation performance between the conductive bar 210 and the conductive bar 210. After the conductive bar 210 is inserted into the insulating bar 220, it is beneficial to weld the conductive bar 210 and the insulating bar 220, thereby improving the sealing of the connection between the conductive bar 210 and the insulating bar 220, thereby improving the airtightness of the heat exchange chamber 200a.

[0081] Reference Figure 2 、 Figure 3 As shown, in some embodiments, the at least three conductive bars 210 include a first conductive bar 211 and two second conductive bars 212 , the two second conductive bars 212 are located at both ends of the first conductive bar 211 , and the insulating bar 220 connects the adjacent first conductive bars 211 and the second conductive bars 212 .

[0082] The at least two electrical components 110 include a first component 111 and a second component 112 . One second conductive bar 212 is electrically connected to the first component 111 , another second conductive bar 212 is electrically connected to the second component 112 , and the first conductive bar 211 is electrically connected to both the first component 111 and the second component 112 .

[0083] In this way, the first conductive bar 211 electrically connects the first device 111 and the second device 112, thereby electrically connecting the output end of the first device 111 and the input end of the second device 112 through the first conductive bar 211, thereby connecting the first device 111 and the second device 112 in series. In addition, one second conductive bar 212 is electrically connected to the first device 111, and the other second conductive bar 212 is electrically connected to the second device 112, thereby allowing the current of the external circuit to be transmitted from one second conductive bar 212 to the first device 111, then to the second device 112 through the second conductive bar 212, and then to the external circuit through the other second conductive bar 212, thereby connecting the power distribution device to the external circuit.

[0084] Reference Figure 3 、 Figure 4 As shown, in some embodiments, the first conductive bar 211 has a first cavity 2111, the second conductive bar 212 has a second cavity 2121, and the insulating bar 220 has a third cavity 221. The first cavity 2111, the second cavity 2121, and the third cavity 221 are interconnected to form the heat exchange chamber 200a.

[0085] In this way, the first cavity 2111, the second cavity 2121 and the third cavity 221 are respectively set on the first conductive bar 211, the second conductive bar 212 and the insulating bar 220, and each first cavity 2111, the second cavity 2121 and the third cavity 221 are interconnected, so that the heat exchange cavity 200a can pass through each conductive bar 210 and each insulating bar 220, so that the coolant dissipates heat for each electrical component 110, thereby improving the heat exchange effect of the distribution device.

[0086] Reference Figure 1 、 Figure 2 As shown, in a possible implementation, the power distribution device further includes two first connecting bars 300 , the first conductive bar 211 is electrically connected to the first device 111 through one first connecting bar 300 , and the first conductive bar 211 is electrically connected to the second device 112 through another first connecting bar 300 .

[0087] The power distribution device also includes two second connecting bars 400 , which are arranged in one-to-one correspondence with the second conductive bars 212 . One second conductive bar 212 is electrically connected to the first device 111 through the corresponding second connecting bar 400 , and the other second conductive bar 212 is electrically connected to the second device 112 through the corresponding second connecting bar 400 .

[0088] With such an arrangement, the first device 111 and the second device 112 can be connected in series through the first connecting bar 300 , the second connecting bar 400 and the busbar assembly 200 , and the electrical assembly 100 can be connected to an external circuit.

[0089] Reference Figure 1 As shown, it should be noted that, in some embodiments, the power distribution device may further include a housing 500 and a circuit board 600. The electrical assembly 100, the busbar assembly 200, and the circuit board 600 may all be installed in the housing 500. The electrical assembly 100 may further include a pre-charge module 113. One of the first device 111 and the second device 112 is a fuse, and the other is a relay. If there is an overvoltage, short circuit, or overtemperature in the circuit, the fuse blows to disconnect the circuit between the battery assembly and the electrical device. The relay is used to connect and disconnect the circuit between the battery assembly and the load of the electrical device. The pre-charge module 113 is used to pre-charge the input capacitor of the electrical device before the relay is closed.

[0090] Among them, the fuse and the relay are both electrically connected to the circuit board 600. After the fuse and the relay are connected in series through the busbar assembly 200, they can constitute the main positive control circuit of the distribution device. The pre-charge module 113 can be connected in parallel with the relay through the circuit board 600, thereby constituting the pre-charge control circuit of the distribution device.

[0091] Reference Figure 1 and Figure 2As shown, in some embodiments, the first connecting bar 300 includes a first connecting wall 310, a second connecting wall 320, and a third connecting wall 330 connected in sequence. The second connecting wall 320 is located between the first conductive bar 211 and the electrical component 110, and the second connecting wall 320 is fixedly connected to the electrical component 110. The first connecting wall 310 and the third connecting wall 330 are located on opposite sides of the second conductive bar 212, and both the first connecting wall 310 and the third connecting wall 330 are fixedly connected to the first conductive bar 211.

[0092] Taking the first connecting bar 300 for connecting the first conductive bar 211 and the first device 111 as an example, since a first cavity 2111 is provided in the first conductive bar 211, the first conductive bar 211 and the first connecting bar 300 need to be welded, and the second connecting wall 320 is located between the first conductive bar 211 and the first device 111. The second connecting wall 320 can be connected to the first device 111, thereby electrically connecting the first connecting bar 300 and the first device 111. The second connecting wall 320 cannot be welded to the first conductive bar 211. Therefore, it is necessary to set a first connecting wall 310 and a third connecting wall 330 on both sides of the first conductive bar 211, and then weld to the first conductive bar 211 through the first connecting wall 310, and weld to the first conductive bar 211 through the third connecting wall 330, thereby realizing the electrical connection between the first connecting bar 300 and the first conductive bar 211, so that the first conductive bar 211 is electrically connected to the first device 111 through the first connecting bar 300.

[0093] The second connecting wall 320 may be connected to the first component 111 via a threaded connection.

[0094] Reference Figure 1 and Figure 2 As shown, in some embodiments, the second connecting bar 400 includes a first connecting portion 410 and a second connecting portion 420, wherein the first connecting portion 410 is connected to a side of the second connecting portion 420 facing away from the first conductive bar 211. The first connecting portion 410 is configured to connect to an external circuit, and the second connecting portion 420 electrically connects the second conductive bar 212 and the electrical component 110.

[0095] In this arrangement, a second connecting bar 400 can electrically connect the corresponding second conductive bar 212 and the first device 111, and the first connecting portion 410 of the second connecting bar 400 can constitute the circuit input end of the distribution device, and another second connecting bar 400 can electrically connect the corresponding second conductive bar 212 and the second device 112, and the first connecting portion 410 of the second connecting bar 400 can constitute the circuit output end of the distribution device.

[0096] For example, the first connection portion 410 may be connected to a wiring harness via a threaded connector, thereby enabling the power distribution device to be connected to an external circuit.

[0097] Reference Figure 1 、 Figure 2 As shown, in some embodiments, the second connecting portion 420 includes a fourth connecting wall 421, a fifth connecting wall 422, and a sixth connecting wall 423 connected in sequence, the fifth connecting wall 422 being located between the second conductive bar 212 and the electrical component 110, and the fifth connecting wall 422 being fixedly connected to the electrical component 110. The fourth connecting wall 421 and the sixth connecting wall 423 are located on opposite sides of the second conductive bar 212, and both the fourth connecting wall 421 and the sixth connecting wall 423 are fixedly connected to the second conductive bar 212.

[0098] It can be understood that one second connecting bar 400 is used to connect the corresponding second conductive bar 212 and the first device 111, and another second connecting bar 400 is used to connect the corresponding second conductive bar 212 and the second device 112. Here, the second connecting bar 400 used to connect the second conductive bar 212 and the first device 111 is used as an example for description.

[0099] Since a second cavity 2121 is provided in the second conductive bar 212, the second conductive bar 212 and the second connection bar 400 need to be welded, and the fifth connection wall 422 is located between the second conductive bar 212 and the first device 111. The fifth connection wall 422 can be connected to the first device 111, thereby electrically connecting the second connection bar 400 and the first device 111. The fifth connection wall 422 cannot be welded to the second conductive bar 212. Therefore, a fourth connection wall 421 and a sixth connection wall 423 need to be provided on both sides of the second conductive bar 212, and then welded to the second conductive bar 212 through the fourth connection wall 421, and welded to the second conductive bar 212 through the sixth connection wall 423, thereby realizing the electrical connection between the second connection bar 400 and the second conductive bar 212, so that the second conductive bar 212 is electrically connected to the first device 111 through the second connection bar 400.

[0100] Reference Figures 1 to 3 As shown, in one possible implementation, the busbar assembly 200 further includes two blocking members 230, which are open at both ends of the second cavity 2121. The blocking members 230 are connected to the end of the second conductive bar 212 facing away from the insulating bar 220 to block the end of the second cavity 2121 facing away from the insulating bar 220.

[0101] It should be noted that the first conductive bar 211 and the second conductive bar 212 can both be made of a hollow metal flat tube. In this way, the cost of the first conductive bar 211 and the second conductive bar 212 can be reduced. Since the two ends of the second conductive bar 212 are open, a sealing member 230 can be provided at the end of the second conductive bar 212 away from the first conductive bar 211, thereby sealing the end of the second conductive bar 212 away from the first conductive bar 211. As a result, after the first conductive bar 211, the second conductive bar 212 and the insulating bar 220 are connected, the first cavity 2111, the second cavity 2121 and the third cavity 221 jointly define the heat exchange chamber 200a. Except for the liquid inlet 200b and the liquid outlet 200c, the other parts of the heat exchange chamber 200a are in a closed state relative to the outside world.

[0102] The material of the blocking member 230 can be the same as that of the conductive bar 210 or the insulating bar 220 . The blocking member 230 can be welded to the second conductive bar 212 .

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power distribution device, characterized in that: include: Electrical components (100); A busbar assembly (200), the busbar assembly (200) being provided with a heat exchange cavity (200a), the heat exchange cavity (200a) being configured to allow coolant to circulate, the busbar assembly (200) being connected to the electrical assembly (100) and configured to transmit current to the electrical assembly (100) and dissipate heat for the electrical assembly (100); The electrical assembly (100) comprises at least two electrical components (110), and the input end of one of the at least two electrical components (110) and the output end of the other are electrically connected via the busbar assembly (200); The busbar assembly (200) comprises at least three conductive bars (210) and at least two insulating bars (220), the conductive bars (210) and the insulating bars (220) being arranged alternately, and the insulating bars (220) connecting two adjacent conductive bars (210) so that the two adjacent conductive bars (210) are insulated, and the conductive bars (210) are electrically connected to the electrical component (110); The heat exchange cavity (200a) passes through all the conductive rows (210) and all the insulating rows (220).

2. The power distribution device according to claim 1, characterized in that: The busbar assembly (200) is provided with a liquid inlet (200b) and a liquid outlet (200c), the liquid inlet (200b) and the liquid outlet (200c) are both communicated with the heat exchange cavity (200a), and the liquid inlet (200b) and the liquid outlet (200c) are both constructed to be connected to a cooling liquid circulation device.

3. The power distribution device according to claim 2, characterized in that: At least one guide rib (200d) is provided in the heat exchange cavity (200a), and the at least one guide rib (200d) divides the heat exchange cavity (200a) into at least two sub-cavities, and at least two of the sub-cavities are connected to each other, one of the sub-cavities is connected to the liquid inlet (200b), and the other of the sub-cavities is connected to the liquid outlet (200c).

4. The power distribution device according to claim 2, characterized in that: The liquid inlet (200b) and the liquid outlet (200c) are located on the same insulating row (220), and the liquid inlet (200b) and the liquid outlet (200c) are located on opposite sides of the insulating row (220).

5. The power distribution device according to claim 1, characterized in that: Among the at least three conductive bars (210) and the at least two insulating bars (220), two adjacently arranged bars are welded.

6. The power distribution device according to claim 1, characterized in that: The material of the conductive row (210) includes at least one of copper and aluminum, and the material of the insulating row (220) includes ceramic.

7. The power distribution device according to claim 1, characterized in that: Of the two adjacently arranged conductive bars (210), the ends of the two conductive bars (210) facing each other are plugged into the adjacent insulating bar (220).

8. The power distribution device according to any one of claims 1 to 7, characterized in that: At least three of the conductive bars (210) include a first conductive bar (211) and two second conductive bars (212), the two second conductive bars (212) are located at both ends of the first conductive bar (211), and the insulating bar (220) connects the adjacently arranged first conductive bars (211) and second conductive bars (212); At least two of the electrical components (110) include a first component (111) and a second component (112), one of the second conductive bars (212) is electrically connected to the first component (111), another of the second conductive bars (212) is electrically connected to the second component (112), and the first conductive bar (211) is electrically connected to both the first component (111) and the second component (112).

9. The power distribution device according to claim 8, characterized in that: The first conductive row (211) has a first cavity (2111), the second conductive row (212) has a second cavity (2121), and the insulating row (220) has a third cavity (221); The first cavity (2111), the second cavity (2121), and the third cavity (221) are interconnected to jointly constitute the heat exchange cavity (200a).

10. The power distribution device according to claim 8, characterized in that: The invention also includes two first connecting bars (300), wherein the first conductive bar (211) is electrically connected to the first component (111) through one of the first connecting bars (300), and the first conductive bar (211) is electrically connected to the second component (112) through another of the first connecting bars (300).

11. The power distribution device according to claim 10, characterized in that: The first connecting bar (300) comprises a first connecting wall (310), a second connecting wall (320), and a third connecting wall (330) connected in sequence, the second connecting wall (320) being located between the first conductive bar (211) and the electrical component (110), and the second connecting wall (320) being fixedly connected to the electrical component (110); The first connecting wall (310) and the third connecting wall (330) are located on opposite sides of the second conductive row (212), and both the first connecting wall (310) and the third connecting wall (330) are fixedly connected to the first conductive row (211).

12. The power distribution device according to claim 8, characterized in that: The device further comprises two second connecting bars (400), wherein the second connecting bars (400) and the second conductive bars (212) are arranged in a one-to-one correspondence, one second conductive bar (212) is electrically connected to the first device (111) through the corresponding second connecting bar (400), and the other second conductive bar (212) is electrically connected to the second device (112) through the corresponding second connecting bar (400).

13. The power distribution device according to claim 12, characterized in that: The second connecting row (400) comprises a first connecting portion (410) and a second connecting portion (420), wherein the first connecting portion (410) is connected to a side of the second connecting portion (420) facing away from the first conductive row (211); The first connection portion (410) is configured to be connected to an external circuit, and the second connection portion (420) electrically connects the second conductive bar (212) and the electrical component (110).

14. The power distribution device according to claim 13, characterized in that: The second connecting portion (420) comprises a fourth connecting wall (421), a fifth connecting wall (422), and a sixth connecting wall (423) connected in sequence, the fifth connecting wall (422) being located between the second conductive bar (212) and the electrical component (110), and the fifth connecting wall (422) being fixedly connected to the electrical component (110); The fourth connecting wall (421) and the sixth connecting wall (423) are located on opposite sides of the second conductive row (212), and both the fourth connecting wall (421) and the sixth connecting wall (423) are fixedly connected to the second conductive row (212).

15. The power distribution device according to claim 9, characterized in that: The busbar assembly (200) further includes two blocking members (230), and both ends of the second cavity (2121) are open; The blocking member (230) is connected to the end of the second conductive row (212) facing away from the insulating row (220) to block the end of the second cavity (2121) facing away from the insulating row (220).

16. The power distribution device according to claim 8, characterized in that: One of the first device (111) and the second device (112) is a fuse, and the other is a relay.

17. A battery pack, characterized in that: It comprises a battery assembly and a power distribution device as described in any one of claims 1 to 16, wherein the power distribution device is electrically connected to the battery assembly.

18. An electrical device, characterized in that: Comprising the power distribution device according to any one of claims 1 to 16, or the battery pack according to claim 17.

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