CN220629913U - BDU module and battery pack - Google Patents

Abstract

The application discloses BDU module and battery package, BDU module includes the box body, the box body is provided with the opening, set up electrical component in the holding chamber of box body, the conducting bar sets up in electrical component and is connected with electrical component electricity, through setting up radiator unit, radiator unit covers to at least partial opening for radiator unit both has been regarded as the part of BDU module top cap, simultaneously be constructed as the heat that can distribute the electrical component that covers to the box body outside, radiator unit dispels the heat to electrical component and conducting bar through natural cooling's mode, the radiating area is big, the radiating effect is good, effectively promote the life of BDU module, and the performance of BDU module can be promoted; and has the function of BDU top cap concurrently for BDU simple structure, equipment is convenient.

Description

BDU module and battery pack

Technical Field

The application relates to the technical field of batteries, in particular to a BDU module and a battery pack.

Background

The BDU (Battery Disconnect Unit, BDU) module, also called a battery cut-off unit, is located inside the battery pack and is a working unit for high-voltage distribution, cut-off and short-circuit protection of the battery system. The BDU module realizes the control to charge and discharge return circuit break-make through the relay, connects through the copper bar between the relay, and the BDU module is in the course of the work, and the relay calorific capacity is great, but the heat dispersion of relay and copper bar is relatively poor, leads to BDU module performance to decline, can't satisfy the needs of battery package quick charge technique.

Disclosure of Invention

The utility model aims to provide a BDU module and battery package to solve present BDU module relay and copper bar heat dispersion poor problem that leads to BDU module performance to descend.

A first aspect of an embodiment of the present application provides a BDU module, including: the box body comprises a bottom wall and a side wall connected with the bottom wall, and the bottom wall and the side wall are surrounded to form a containing cavity and an opening communicated with the containing cavity; an electrical component disposed in the accommodation chamber; the conducting bar is arranged in the accommodating cavity and is electrically connected with the electric element; a heat dissipation assembly comprises a substrate and a heat dissipation member _， The base plate covers at least part of the opening, the heat dissipation piece is arranged on one side of the base plate, which is away from the accommodating cavity, and one side of the base plate, which is towards the accommodating cavity, is used for being connected with the conducting bars, so that heat generated by the electric element is dissipated to the outer side of the box body through the heat dissipation component.

Preferably, the heat sink comprises a plurality of heat radiating fins, and the plurality of heat radiating fins are arranged on the base plate at intervals.

Preferably, the substrate covers all of the openings.

Preferably, the electrical components are at least three, the at least three electrical components are arranged in the accommodating cavity at intervals along a first direction, the electrical components are provided with a first surface and a second surface which are oppositely arranged along a third direction, the first surface faces the opening, and the first direction intersects with the third direction; the conductive bars are arranged in a plurality of mode along the first direction at intervals, and each conductive bar is arranged on the first surface and is electrically connected with each electric element respectively.

Preferably, the substrate extends along the first direction, and the BDU module further includes a heat conductive member, where the heat conductive member is disposed between the conductive row and the substrate in the third direction and is connected to the conductive row and the substrate respectively; the heat conducting piece is arranged in an insulating way with the substrate, or the heat conducting piece is arranged in an insulating way with the electric conducting bar.

Preferably, the BDU module further includes an insulating plate disposed between the bottom surface of the base plate facing the accommodating chamber and the heat conductive member in the third direction.

Preferably, the side wall comprises a first side wall and a second side wall which are oppositely arranged along a second direction, the first side wall and the second side wall are respectively provided with a supporting part, the supporting parts extend along the third direction, and the substrate is fixedly connected with the supporting parts; the first direction, the second direction and the third direction are intersected in pairs.

Preferably, the heat conducting member is integrally formed with the heat dissipating assembly.

Preferably, the electrical element includes a relay group and a fuse, the relay group includes a plurality of relays arranged at intervals along a first direction, the fuse and the relay group are arranged at intervals along the first direction, and the fuse is connected with adjacent relays through a conductive bar; the orthographic projection of the fuse on a projection plane perpendicular to the third direction is located on the inner side of the bottom surface of the substrate facing the accommodating cavity.

Preferably, the electrical component further includes a shunt provided in the accommodation chamber, the shunt being provided outside an end of the relay group facing away from the fuse in the first direction; the orthographic projection of the diverter on a projection plane perpendicular to the third direction is positioned on the inner side of the bottom surface of the substrate facing the accommodating cavity.

A second aspect of embodiments of the present application provides a battery pack comprising a BDU module as described above.

In summary, the embodiment of the application provides a BDU module and have battery package of this BDU module, the BDU module includes the box body, the box body is provided with the opening, set up electrical component in the holding chamber of box body, the conducting bar sets up in holding chamber and is connected with electrical component electricity, through setting up radiating assembly, radiating assembly covers to the top cap structure of at least partial opening as BDU box body, and radiating assembly is constructed simultaneously and to the heat that can distribute to the box body outside with the electrical component that covers, radiating assembly dispels the heat to electrical component and conducting bar through natural cooling's mode, radiating area is big, the radiating effect is good, effectively promote BDU module's life, and can promote BDU module's performance. And has the function of BDU top cap concurrently for BDU simple structure, equipment is convenient.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a BDU module according to an embodiment of the present application;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is an exploded view of FIG. 1;

fig. 5 is a schematic diagram of a combined structure of a heat conducting member and a heat conducting adhesive in a BDU module according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a BDU module relay provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a fuse in a BDU module according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a shunt in a BDU module according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a current sensor in a BDU module according to an embodiment of the present application.

The main reference numerals illustrate:

1. a BDU module;

10. a box body, 101, a bottom wall, 102, side walls, 1021, a first side wall, 1022, a second side wall, 103, an opening, 110, a containing cavity, 120, and a supporting part

20. An electrical component 201, a first surface 202, a second surface;

21. relay group, 21a, main positive relay, 21b, fast charge positive relay, 21c, fast charge negative relay, 21d, main negative relay, 211, electric connection end;

22. a fuse 221, a first mounting end, 222, a second mounting end;

23. a shunt 231, a first overlap end, 232, a second overlap end;

24. a current sensor 241, a through hole;

251. a precharge relay 252 and a precharge resistor;

30. the conductive bars 31, the first conductive bar, 32, the second conductive bar, 33, the third conductive bar, 34, the fourth conductive bar, 35, the fifth conductive bar, 36 and the sixth conductive bar;

40. a heat dissipation assembly 401, a substrate, 4011, a bottom surface 4012, a top surface 402 and a heat dissipation element;

50. the heat conducting member, 501, first section, 502, second section, 503, third section, 504, groove, 505, opening hole, 51, heat conducting glue, 52 and insulating board.

X, first direction, Y, second direction, Z, third direction.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is presented herein for purposes of illustration only and is not intended to limit the application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" means two or more, unless specifically defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

In the embodiment of the application, "parallel" refers to a state in which the angle defined by a straight line and a straight line, a straight line and a plane, or a plane and a plane is-1 ° to 1 °. The term "perpendicular" refers to a state in which the angle defined by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89 ° to 91 °. The equal distance or angle refers to the state that the tolerance range is-1%.

The application provides a battery pack, which comprises a BDU module.

In some embodiments of the present application, referring to fig. 1 to 4, there is provided a BDU module 1, the BDU module 1 including: the electrical component assembly comprises a box body 10, an electrical component 20, a conductive bar 30 and a heat dissipation assembly 40.

Referring to fig. 1, 2 and 4, the case 10 includes a bottom wall 101 and a side wall 102, the bottom wall 101 and the side wall 102 enclosing an accommodating chamber 110 and an opening 103 communicating with the accommodating chamber 110, the bottom wall 101 being located at an end of the side wall 102 remote from the opening 103 in a third direction Z. In other words, as shown in the embodiment of fig. 1, 2 and 4, the number of the side walls 102 is four, the four side walls 102 are connected end to end in sequence to form a hollow cube structure with two open ends, the bottom wall 101 is covered on one open end of the hollow cube structure, the opening 103 is formed on the other open end of the hollow cube structure, and the bottom wall 101 and the opening 103 are oppositely arranged in the third direction Z.

An electrical component (20), the electrical component (20) being arranged in the receiving cavity (110); a conductive bar (30) disposed in the housing cavity (110) and electrically connected to the electrical component (20); a heat dissipation assembly (40) comprising a substrate (401) and a heat dissipation element (402) _， The base plate (401) covers at least part of the opening (103), the heat dissipation piece (402) is arranged on one side, facing away from the accommodating cavity (110), of the base plate (401), one side, facing towards the accommodating cavity (110), of the base plate (401) is used for being connected with the conducting bars (30), and therefore heat generated by the electric element (20) is dissipated to the outer side of the box body (10) through the heat dissipation component (40).

With continued reference to fig. 1, 2 and 4, optionally, the number of electrical components 20 is at least three, arranged at intervals along a first direction X, each electrical component 20 has a first surface 201 and a second surface 202 disposed opposite along a third direction Z, the electrical components 20 are disposed in the housing cavity 110, the first surfaces 201 of the electrical components 20 face the opening 103, the first direction X intersects the third direction Z, and in the embodiment shown in fig. 1-4, the first direction X is orthogonal to the third direction Z. Illustratively, the third direction Z is a height direction of the BDU module and the first direction X is a length direction of the BDU module.

Referring to fig. 2 and 4, the number of the conductive bars 30 is plural, and the conductive bars 30 are arranged at intervals along the first direction X, the conductive bars 30 are disposed on the first surface 201 of the electric element 20, and the conductive bars 30 are electrically connected with the electric element 20. In the exemplary embodiment shown in fig. 2 and 4, two electrical components 20 adjacent to each other in the first direction X are electrically connected by a conductive track 30.

In some embodiments of the present application, the conductive bars 30 are copper bars.

In some embodiments of the present application, the heat dissipation assembly 40 extends along the first direction X, the heat dissipation assembly 40 covers at least a portion of the opening 103, the heat dissipation assembly 40 covers at least two electrical components 20, and the heat dissipation assembly 40 is configured to be capable of dissipating heat generated by the electrical components 20 to the outside of the case 10. In the embodiment shown in fig. 1 to 4, the heat dissipation assembly 40 covers all the openings 103, and a cover of the openings 103 formed by the heat dissipation assembly 40 is disposed in the accommodating cavity 110.

The electrical component 20 in the BDU module 1 generates more heat in the working process, the conductive bar 30 is used as a component for connecting adjacent electrical components 20, although the electrical conductivity is better, the thermal conductivity is poorer, and the heat dissipation capability of the electrical component 20 is poorer, so that the heat generated in the working process of the electrical component 20 cannot be discharged through the conductive bar 30, the service life of the electrical component 20 can be influenced for a long time, the performance of the BDU module 1 is reduced, especially under the condition that the battery pack needs to be charged quickly, the heating value of the electrical component 20 is larger, the heat cannot be discharged in time, and the performance degradation of the electrical component 20 can be aggravated.

In the prior BDU module, most of electric elements are integrated in a box body, the whole of the box body is of a closed hexahedral structure, heat generated in the working process of the electric elements arranged in the closed box body cannot be timely dissipated, and although the related design that the liquid cooling plate is arranged on the side wall or the top surface of the closed box body to reduce the temperature of the inner side of the box body is adopted in the prior art, the space in a battery pack can be additionally occupied by the liquid cooling plate, the processing and manufacturing difficulty can be increased, and the cost is increased.

In the BDU module 1 provided in the present application, the top surface of the box body 10 in the third direction Z is provided with the opening 103, and the heat dissipation component 40 is covered on at least part of the opening 103, so that the heat dissipation component 40 replaces the top surface of the existing closed box body, on one hand, a cover for the opening 103 can be formed, on the other hand, the heat dissipation efficiency of the electrical element 20 arranged in the accommodating cavity 110 can be effectively improved, further the service life of the electrical element 20 is prolonged, and the service life of the BDU module 1 is prolonged. And the heat dissipation assembly 40 only needs to occupy a small amount of space in the battery pack in the third direction Z, and does not additionally occupy space in the first direction X and the second direction Y in the battery pack, thereby improving the space utilization rate in the battery pack and improving the energy density of the battery pack. And the heat dissipation assembly 40 conducts heat and dissipates heat through natural cooling, so that manufacturing cost can be reduced.

In addition, in the BDU module 1 provided in this embodiment, the heat dissipation assembly 40 covers at least two electrical elements 20, so that the heat dissipation assembly 40 has a relatively high heat dissipation area, the heat dissipation effect of the heat dissipation assembly 40 is improved, and an independent heat dissipation assembly 40 is not required to be separately arranged on each electrical element 20, so that the integration degree of components is improved. The heat generated in the working process of the electric element 20 is timely discharged, the service life of the electric element 20 is prolonged, and the service performance of the BDU module 1 is improved.

In some embodiments of the present application, referring to fig. 1 to 4, the BDU module 1 further includes a heat conducting member 50, where the heat conducting member 50 is stacked with the heat dissipating assembly 40 in an insulating manner along the third direction Z, and the heat conducting member 50 is disposed on a surface of the heat conducting bar 30 facing away from the first surface 201 of the electrical element 20 in the third direction Z, and the heat conducting member 50 is configured to conduct heat generated by the electrical element 20 to the heat dissipating assembly 40, so that the heat generated by the electrical element 20 is dissipated to the air inside the battery pack outside the BDU module 1 through the heat dissipating assembly 40, and the heat dissipating assembly 40 dissipates heat to the electrical element 20 and the heat conducting bar 30 in a natural cooling manner. In addition, the heat conducting member 50 and the heat dissipating component 40 are stacked in an insulating manner, so that the plurality of electrical components 20 are prevented from being connected through the heat dissipating component 40, and the occurrence of short circuit is avoided. In addition, due to the good heat dissipation effect of the heat dissipation assembly 40 on the electrical component 20, the thickness of the conductive bars 30 can be designed to be thinner, thereby further reducing the manufacturing cost.

Optionally, to avoid that the heat dissipating component 40 and the conductive bar (30) are electrically conductive, the heat conducting member (50) is arranged insulated from the conductive bar (30).

In some embodiments of the present application, the heat conducting member 50 may be made of a material with good thermal conductivity but poor electrical conductivity, such as gypsum, silica gel, potting adhesive, ceramic, etc., so as to conduct heat to the electrical conductor bars 30 and the electrical components 20, and to provide insulation between the heat conducting member 50 and the heat dissipating component 40.

In some embodiments of the present application, the heat dissipating assembly 40 covers at least two electrical components 20, indicating that the heat dissipating assembly 40 covers at least two adjacent two electrical components 20 in the first direction X, the orthographic projections of the adjacent two electrical components 20 on the projection plane perpendicular to the third direction Z respectively fall inside the heat dissipating assembly 40, or the boundary of the orthographic projection of the electrical components 20 on the projection plane perpendicular to the third direction Z coincides with the boundary of the heat dissipating assembly 40, such that the heat dissipating assembly 40 covers at least two electrical components 20. Likewise, the orthographic projection of the conductive bars 30 disposed on the first surfaces 201 of the adjacent at least two electrical components 20 in the third direction Z falls on the inner side of the heat dissipation assembly 40, so as to ensure the heat dissipation area of the heat dissipation assembly 40 and ensure the heat dissipation effect of the heat dissipation assembly 40.

In some embodiments of the present application, referring to fig. 1 to 4, the heat dissipation component 40 includes a substrate 401 and a heat dissipation member 402, the substrate 401 includes a bottom surface 4011 and a top surface 4012 that are disposed opposite to each other along a third direction Z, the bottom surface 4011 of the substrate 401 faces the conductive bars 30, the heat conduction member 50 is connected to the bottom surface 4011 to conduct heat to the heat dissipation component 40, and the heat dissipation member 402 is disposed on the top surface 4012 of the substrate 401 to dissipate the heat conducted by the heat conduction member 50. Wherein the orthographic projection of at least two electrical components 20 on a projection plane perpendicular to said third direction Z falls inside the bottom surface 4011.

In some embodiments of the present application, referring to fig. 1 to 4, the heat dissipation elements 402 extend along a first direction X, the number of the heat dissipation elements 402 is plural, and the heat dissipation elements are arranged at intervals along a second direction Y, which intersects with the first direction X and a third direction Z, respectively, and specifically, in the embodiments shown in fig. 1 to 4, the second direction Y is orthogonal to the first direction X and the third direction Z, respectively. The design of the plurality of heat dissipation elements 402 can further improve the heat dissipation efficiency and heat dissipation area of the heat dissipation assembly 40, and improve the heat dissipation effect of the heat dissipation assembly 40.

In some embodiments of the present application, the heat sink 402 is a heat sink fin and is provided in multiple pieces. The plurality of radiating fins are arranged on the base plate (401) at intervals.

Alternatively, the heat sink 402 may also be a component of other structures, such as a post, a bevel, or other shapes.

In some embodiments of the present application, referring to fig. 4, the bdu module 1 further includes a heat conducting glue 51, where the heat conducting glue 51 is disposed on a surface of the heat conducting member 50 facing away from the conductive row 30 in the third direction Z, the heat conducting member 50 is connected with the bottom surface 4011 of the substrate 401 through the heat conducting glue 51, specifically, the heat conducting member 50 is bonded with the bottom surface 4011 of the substrate 401 through the heat conducting glue 51, and the heat conducting glue 51 can ensure stability of assembling between the heat conducting member 50 and the heat dissipating component 40 on one hand, and on the other hand, can cooperate with the heat conducting member 50 to form conduction of heat generated by the electrical element 20, so as to further improve heat conduction efficiency. The thickness and the surface area of the heat-conducting glue 51 can be adjusted according to practical requirements, and the lower the thickness is, the smaller the thermal resistance of the heat-conducting glue 51 is.

In some embodiments of the present application, referring to fig. 4 and 5, the heat conducting member 50 includes a first segment 501, a second segment 502 and a third segment 503 connected in sequence, where the first segment 501 and the third segment 503 extend along a first direction X, the first segment 501 and the third segment 503 are parallel to each other, the second segment 502 extends along a third direction Z, the first segment 501 abuts against the conductive strip 30, and the heat conducting glue 51 is attached to a surface of the third segment 503 facing away from the first segment 501 in the third direction Z. The first section 501 and the third section 503 are respectively connected to opposite ends of the second section 502 in the third direction Z, so that the heat conducting member 50 forms a zigzag structure, which can further improve the heat conducting efficiency of the heat conducting member 50 and avoid heat accumulation inside the heat conducting member 50 and around the heat conducting member 50.

In some embodiments of the present application, a groove 504 is formed on a surface of the third section 503 facing away from the first section 501 in the third direction Z, so that a concave structure is formed on a surface of the third section 503 facing away from the first section 501 in the third direction Z, and an opening 505 extending along the third direction Z is formed on an inner bottom wall of the groove 504, and the heat conducting member 50 and the conductive strip 30 can be fixedly connected through the opening 505. The shape of the heat conducting glue 51 matches the shape of the side of the third section 503 facing away from the first section 501 in the third direction Z, specifically the shape of the orthographic projection of the heat conducting glue 51 in the third direction Z is concave.

In some embodiments of the present application, referring to fig. 4, the bdu module 1 further includes an insulating plate 52, and the insulating plate 52 is disposed between the bottom surface 4011 of the substrate 401 and the heat conductive member 50, and specifically, the insulating plate 52 is laid on the bottom surface 4011 of the substrate 401, so as to realize insulating stacking between the heat conductive member 50 and the heat dissipation assembly 40.

In some embodiments of the present application, the heat conductive member 50 is integrally formed with the heat dissipating assembly 40. The integrated structure design of the heat conducting member 50 and the heat dissipating component 40 can improve the production efficiency of the heat dissipating component 40 and reduce the production cost.

In some embodiments of the present application, the heat sink assembly 40 weighs ≡100g.

In some embodiments of the present application, the thermal conductivity of the heat sink assembly 40 is greater than or equal to 5W/m k.

In some embodiments of the present application, referring to fig. 1, 2 and 4, the side wall 102 of the box body 10 includes a first side wall 1021 and a second side wall 1022 that are disposed opposite to each other along the second direction Y, and the first side wall 1021 and the second side wall 1022 are respectively provided with a supporting portion 120, where the supporting portion 120 extends along the third direction Z, and the substrate 401 of the heat dissipating component 40 is fixedly connected to the supporting portion 120. Specifically, in the embodiment shown in fig. 1, 2 and 4, the supporting portions 120 are disposed at one end of the first side wall 1021, which is away from the bottom wall 101 in the third direction Z, and the supporting portions 120 are disposed at one end of the second side wall 1022, which is away from the bottom wall 101 in the third direction Z, so that the number of the supporting portions 120 on the first side wall 1021 is two, the number of the supporting portions 120 on the second side wall 1022 is two, which are respectively arranged at intervals along the first direction X, and the supporting portions 120 on the first side wall 1021 and the supporting portions 120 on the second side wall 1022 are respectively disposed two by two along the second direction Y, and the heat dissipation component 40 is fixedly connected with the supporting portions 120 through the substrate 401, for example, the substrate 401 and the supporting portions 120 can be fixedly connected through bolts, so that on one hand, the stability of the assembly between the heat dissipation component 40 and the box body 10 can be ensured, and on the other hand, the assembly and maintenance of the subsequent heat dissipation component 40 are convenient. In other implementations of the embodiments of the present application, the number of the supporting portions 120 on the first side wall 1021 and the second side wall 1022 may be adjusted according to actual use situations, but the number of the supporting portions 120 on the first side wall 1021 is at least two, and the number of the supporting portions 120 on the second side wall 1022 is at least two.

In some embodiments of the present application, the at least three electrical components 20 include a relay group 21 and a fuse 22, the relay group 21 and the fuse 22 are arranged at intervals along a first direction X, specifically, the relay group 21 includes at least two relays including a positive relay and a negative relay, the fuse 22 and the positive relay are adjacent in the first direction X, the fuse 22 is electrically connected with the positive relay through a conductive bar 30, the positive relay and the negative relay are electrically connected through the conductive bar 30, the negative relay is electrically connected with a negative terminal of a battery pack in a battery pack through a connection copper bar, and a orthographic projection of the fuse 22 on a third direction Z is located inside a bottom surface 4011 of a substrate 401 of the heat dissipation assembly 40.

In some embodiments of the present application, referring to fig. 1, 2, and 4-7, the relay group 21 includes four relays including a main positive relay 21a, a fast charge positive relay 21b, a fast charge negative relay 21c, and a main negative relay 21d, the main positive relay 21a, the fast charge positive relay 21b, the fast charge negative relay 21c, and the main negative relay 21d being arranged at intervals along the first direction X.

The conductor bars 30 include a first conductor bar 31, a second conductor bar 32, a third conductor bar 33, a fourth conductor bar 34, a fifth conductor bar 35, and a sixth conductor bar 36.

Referring to fig. 6, the relays are vertical relays, each including a first surface 201 and a second surface 202 disposed opposite to each other in a third direction Z, and each including at least two electrical connection terminals 211, the at least two electrical connection terminals 211 being disposed at intervals on the first surface 201 in a first direction X. In other implementations of the present application, the relay may employ a horizontal relay, i.e., the first surface 201 and the second surface 202 are disposed opposite in the second direction Y. Specifically, the method can be selected according to actual use requirements.

Referring to fig. 2 and 4, in the first direction X, two electrical connection ends 211 adjacent to the main positive relay 21a and the fast charge positive relay 21b are electrically connected through a first conductive bar 31 to control on-off of a positive circuit in the BDU module 1, the main positive relay 21a is electrically connected through the first conductive bar 31 to a positive end of a high voltage connector in a battery pack, two electrical connection ends 211 adjacent to the fast charge negative relay 21c and the main negative relay 21d are electrically connected through a second conductive bar 32 to control on-off of a negative circuit in the BDU module 1, the main negative relay 21d is electrically connected through the second conductive bar 32 to a negative end of the high voltage connector in the battery pack, the positive circuit and the negative circuit together form a charge and discharge circuit of the BDU module 1, and the BDU module 1 controls charge and discharge of the battery pack through the charge and discharge circuit, and the charge and discharge circuit includes the high voltage circuit and the fast charge circuit.

Referring to fig. 1 to 2 and fig. 4 and 7, the fuse 22 is disposed outside one end of the main positive relay 21a facing away from the quick charge positive relay 21b in the first direction X, and referring to fig. 7, the fuse 22 includes two mounting ends disposed opposite to each other in the first direction X, the two mounting ends including a first mounting end 221 and a second mounting end 222, the first mounting end 221 being electrically connected to the main positive relay 21a through a third conductive bar 33, specifically, the first mounting end 221 being electrically connected to an electrical connection end 211 of the main positive relay 21a facing away from the quick charge positive relay 21b in the first direction X through the third conductive bar 33. The fuse 22 is used to open when the current in the charge-discharge circuit of the BDU module 1 exceeds a prescribed value and is maintained for a sufficient time to avoid an adverse effect on the battery pack caused by the excessive current in the charge-discharge circuit.

Referring to fig. 1 to 2 and 4, in the first direction X, the fourth conductive bar 34 is electrically connected to the electrical connection end 211 of the end of the fast charge positive relay 21b facing away from the main positive relay 21a, the fast charge positive relay 21b is electrically connected to the positive end of the fast charge connector in the battery pack through the fourth conductive bar 34, the fifth conductive bar 35 is electrically connected to the electrical connection end 211 of the end of the fast charge negative relay 21c facing away from the main negative relay 21d, and the fast charge negative relay 21c is electrically connected to the negative end of the fast charge connector in the battery pack through the fifth conductive bar 35.

In some embodiments of the present application, referring to fig. 1-2 and fig. 4 and 8, the bdu module 1 further includes a shunt 23, where the shunt 23 is disposed in the accommodating cavity 110, specifically, the shunt 23 is disposed outside an end of the main negative relay 21d facing away from the fast charging negative relay 21c in the first direction X, the shunt 23 includes a first overlap end 231 and a second overlap end 232 disposed opposite to each other along the first direction X, the first overlap end 231 of the shunt 23 is electrically connected with the electrical connection end 211 of the end of the main negative relay 21d facing away from the fast charging negative relay 21c through the sixth conductive bar 36, and the second overlap end 232 of the shunt 23 is electrically connected with the negative electrode end of the battery pack in the battery pack through the connection copper bar. The orthographic projection of the flow splitter 23 in the third direction Z is located inside the bottom surface 4011 of the substrate 401 of the heat dissipating assembly 40.

The main positive relay 21a, the quick charge positive relay 21b, the quick charge negative relay 21c and the main negative relay 21d are arranged at intervals along the first direction X to form a straight shape, so that the conductive bar 30 can be electrically connected with the electric connection end 211 of the relay without bending, and the conductive bar 30 is simple in structural design, low in processing difficulty and low in manufacturing cost.

In some embodiments of the present application, at least two heat conducting members 50 are disposed on each of the conductive bars 30, so that heat generated by each of the electrical components 20 can be conducted from the heat conducting members 50 to the heat dissipating members through the connected conductive bars 30, thereby improving the heat conduction efficiency of the heat dissipating assembly 40. Specifically, in the embodiment shown in fig. 1 to 2 and 4, two heat conducting members 50 are disposed on the first conductive row 31 at intervals along the first direction X, and the two heat conducting members 50 are disposed at intervals along the first direction X. Two heat conducting members 50 are arranged on the second electric conduction row 32 at intervals along the first direction X, and one heat conducting member 50 is arranged on each of the third electric conduction row 33, the fourth electric conduction row 34, the fifth electric conduction row 35 and the sixth electric conduction row 36, and the plurality of heat conducting members 50 are arranged at intervals along the first direction X.

In some embodiments of the present application, referring to fig. 1-2 and fig. 4 and 8, the bdu module 1 further includes a current sensor 24, the current sensor 24 is disposed between the main positive relay 21a and the fuse 22, the current sensor 24 and the main positive relay 21a are sequentially arranged at intervals along the first direction X, and a through hole 241 through which the third conductive bar 33 passes is formed in the current sensor 24.

In some embodiments of the present application, the current sensor 24 is a hall sensor.

In some embodiments of the present application, referring to fig. 1, 2 and 4, the BDU module 1 further includes a pre-charging relay 251 and a pre-charging resistor 252, the pre-charging relay 251 and the pre-charging resistor 252 are disposed on the outer side of the main negative relay 21d facing away from one end of the fast-charging negative relay 21c in the first direction X, and the pre-charging relay 251 and the pre-charging resistor 252 are disposed below the shunt 23 in the third direction Z, and the pre-charging relay 251 and the pre-charging resistor 252 are disposed, so that the BDU module 1 has a pre-charging function, and the safety of the battery pack is improved, and the space between the shunt 23 and the bottom wall 101 of the box 10 in the third direction Z is improved, so that the space utilization in the box 10 is improved.

The foregoing has outlined the detailed description of the embodiments of the present application, and specific examples have been presented herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods and core ideas of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims (11)

1. A BDU module, comprising:

the box body (10), the box body (10) comprises a bottom wall (101) and a side wall (102) connected with the bottom wall (101), and the bottom wall (101) and the side wall (102) are surrounded to form a containing cavity (110) and an opening (103) communicated with the containing cavity (110);

an electrical component (20), the electrical component (20) being arranged in the receiving cavity (110);

a conductive bar (30) disposed in the housing cavity (110) and electrically connected to the electrical component (20);

a heat dissipation assembly (40) comprising a substrate (401) and a heat dissipation element (402) _， The base plate (401) covers at least part of the opening (103), the heat dissipation piece (402) is arranged on one side, facing away from the accommodating cavity (110), of the base plate (401), one side, facing towards the accommodating cavity (110), of the base plate (401) is used for being connected with the conducting bars (30), and therefore heat generated by the electric element (20) is dissipated to the outer side of the box body (10) through the heat dissipation component (40).

2. A BDU module as claimed in claim 1 wherein the heat sink (402) includes a plurality of heat fins spaced apart on the base plate (401).

3. A BDU module according to claim 1 wherein the base plate (401) covers all of the opening (103).

4. A BDU module according to claim 1,

the electrical components (20) are at least three, the at least three electrical components (20) are arranged in the accommodating cavity (110) at intervals along a first direction (X), the electrical components (20) are provided with a first surface (201) and a second surface (202) which are oppositely arranged along a third direction (Z), the first surface (201) faces the opening (103), and the first direction (X) is intersected with the third direction (Z);

the conductive bars (30) are arranged at intervals along the first direction (X), and each conductive bar (30) is arranged on the first surface (201) and is electrically connected with each electric element (20).

5. A BDU module as claimed in claim 4 wherein said base plate (401) extends in said first direction (X), said BDU module further comprising a thermally conductive member (50),

wherein the heat conducting member (50) is disposed between the conductive row (30) and the substrate (401) in the third direction (Z) and is connected to both;

the heat conducting member (50) is arranged in an insulating manner with the substrate (401), or the heat conducting member (50) is arranged in an insulating manner with the electric conducting bar (30).

6. A BDU module according to claim 5 characterized in that it further comprises an insulating plate (52), said insulating plate (52) being arranged between the bottom surface (4011) of the base plate (401) facing the housing cavity (110) and the heat conducting member (50) in the third direction (Z).

7. A BDU module according to claim 4, characterized in that the side wall (102) comprises a first side wall (1021) and a second side wall (1022) arranged opposite to each other along a second direction (Y), the first side wall (1021) and the second side wall (1022) are respectively provided with a support portion (120), the support portion (120) extends along the third direction (Z), and the substrate (401) is fixedly connected with the support portion (120);

the first direction (X), the second direction (Y) and the third direction (Z) intersect in pairs.

8. A BDU module as claimed in claim 6 wherein said thermally conductive member (50) is integrally formed with said heat sink assembly (40).

9. A BDU module according to claim 4 characterized in that said electrical element (20) comprises a relay group (21) and a fuse (22), said relay group (21) comprising a plurality of relays arranged at intervals along a first direction (X), said fuse (22) being arranged at intervals along said first direction (X) with said relay group (21), said fuse (22) being connected to adjacent said relays by means of an electrically conductive strip (30);

wherein an orthographic projection of the fuse (22) on a projection plane perpendicular to the third direction (Z) is located inside a bottom surface (4011) of the substrate (401) facing the accommodating chamber (110).

10. A BDU module according to claim 9 characterized in that said electrical element (20) further comprises a shunt (23), said shunt (23) being provided in said housing cavity (110), said shunt (23) being provided outside one end of said relay group (21) facing away from said fuse (22) in said first direction (X);

wherein the orthographic projection of the flow divider (23) on a projection plane perpendicular to the third direction (Z) is located on the inner side of the bottom surface (4011) of the base plate (401) facing the accommodating chamber (110).

11. A battery pack comprising a BDU module as claimed in any one of claims 1 to 10.