Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises a liquid cooling plate, a battery module and a BDU device, and the battery module and the BDU device are arranged on the upper surface of the liquid cooling plate in a heat conduction manner. Wherein the BDU device comprises a shell, an electrical part and a heat conduction component, the electrical part and the heat conduction component are located in the shell, the shell is arranged on the liquid cooling plate, and the heat conduction component is in heat conduction connection with the electrical part, extends out of the bottom of the shell and is in heat conduction connection with the liquid cooling plate. According to the battery pack provided by the invention, in practical application, the heating electrical parts in the BDU device can conduct heat to the external liquid cooling plate through the heat conduction assembly, and the liquid cooling plate is utilized to dissipate heat of the electrical parts in the BDU device, so that the heat dissipation effect is good. Moreover, the BDU device dissipates heat by using the liquid cooling plate for cooling the battery module, and the BDU device does not need to be provided with a liquid cooling structure, so that the utilization rate of the liquid cooling plate is improved, the volume and the cost of the BUD device are reduced, and the utilization of the internal space of the battery pack is facilitated.

Description

Technical Field

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

[0002] During high-rate fast charging of the battery pack, the temperature of the electrical components inside the BDU (Battery Disconnect Unit) device rises extremely rapidly. If the heat dissipation is not sufficient, the operating temperature of the BDU device will be too high and it will not work, which will greatly reduce the reliability of the battery pack.

[0003] Traditional battery packs cool down the BDU device through natural convection, which has poor heat dissipation effect. In related technologies, a cold plate structure is separately set inside the BDU device. Although it can improve the heat dissipation effect of electrical components, the cold plate structure increases the volume and cost of the BDU device, which is not conducive to the utilization of the internal space of the battery pack. Utility Model Content

[0004] Based on this, the present application provides a battery pack that can not only effectively dissipate heat for the BDU device, but also has low cost and is conducive to the utilization of the internal space of the battery pack.

[0005] The present application provides a battery pack, comprising:

[0006] Liquid cooling plate;

[0007] The battery module and the BDU device are heat-conductingly disposed on the upper surface of the liquid cooling plate; and

[0008] The BDU device includes a shell, and electrical components and a heat-conducting component located in the shell; the shell is arranged on the liquid cooling plate, the heat-conducting component is thermally connected to the electrical components, extends from the bottom of the shell and is thermally connected to the liquid cooling plate.

[0009] In some embodiments, the heat-conducting component includes a plurality of metal bars, each of which is thermally connected to at least one of the electrical components;

[0010] The shell is provided with an avoidance hole, the metal row extends into the avoidance hole and is thermally connected to the liquid cooling plate.

[0011] In some embodiments, the heat-conducting assembly further includes a heat-conducting block, the metal row is supported on the heat-conducting block, the heat-conducting block extends into the avoidance hole, and is thermally connected to the liquid cooling plate.

[0012] In some embodiments, the heat conduction assembly includes a heat conduction insulating pad, which is disposed between the heat conduction block and the liquid cooling plate and / or between the metal row and the liquid cooling plate; and / or,

[0013] A heat-conducting insulating layer is disposed on the surface of at least one of the metal row and the liquid cooling plate, and the two are heat-conductingly connected to each other insulated by the heat-conducting insulating layer.

[0014] In some embodiments, a buckle is provided in the housing, a bayonet is provided on the side of the heat conducting block, and the buckle is engaged with the bayonet;

[0015] The buckle can be elastically deformed in a direction intersecting with the axis of the avoidance hole.

[0016] In some embodiments, the BDU device includes a first fastener, which fastens the metal bar and the housing in a vertical direction.

[0017] In some embodiments, the electrical component includes a main relay and a fuse, the contacts of the main relay and the contacts of the fuse are located in a horizontal direction, and the heat conduction component is thermally connected to the contacts.

[0018] In some embodiments, the electrical component includes a first main relay and a second main relay, each of the first main relay and the second main relay having two contacts located at the same end in the width direction of the BDU device;

[0019] The fuse has two contacts located at two different ends in the width direction;

[0020] Part of the heat-conducting components is arranged on the same side of the first main relay and the second main relay facing their contacts; part of the heat-conducting components is arranged on the side of the fuse facing one of the contacts, and part of the heat-conducting components is arranged on the side of the fuse facing the other contact.

[0021] In some embodiments, the thermally conductive assembly includes a first metal row, a second metal row, a third metal row, a fourth metal row, and a fifth metal row;

[0022] The electrical components include a Hall sensor, the first main relay, a pre-charge relay, the second main relay, the fuse and a pre-charge resistor arranged in sequence along the length direction of the BDU device; the first metal bar connects one of the contacts of the first main relay and the Hall sensor, and the second metal bar connects the other contact of the first main relay; the third metal bar connects one of the contacts of the second main relay, the fourth metal bar connects the other contact of the second main relay and one of the contacts of the fuse, and the fifth metal bar connects the other contact of the fuse.

[0023] In some embodiments, a heat dissipation grille is disposed on the housing, and the heat dissipation grille is disposed opposite to the fuse.

[0024] In some embodiments, a convex hump protruding outward is disposed on the top of the housing, and an inner side of the convex hump is concave to form an accommodation space, and the accommodation space is located above the Hall sensor and accommodates at least a portion of the Hall sensor.

[0025] In actual application of the above battery pack, the heat-generating electrical components in the BDU device can transfer heat to the external liquid cooling plate through the heat-conducting component, and the liquid cooling plate is used to dissipate heat from the electrical components in the BDU device, with good heat dissipation effect. Moreover, the BDU device uses the liquid cooling plate that cools the battery module to dissipate heat for it, and the BDU device itself does not need to be equipped with a liquid cooling structure, which not only improves the utilization rate of the liquid cooling plate, but also reduces the volume and cost of the BDU device, which is conducive to the utilization of the internal space of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 Schematic diagram of the structure of the battery pack of some embodiments.

[0028] Figure 2 for Figure 1 Exploded view of the battery pack shown.

[0029] Figure 3 for Figure 1 Cross-sectional view at AA in the middle.

[0030] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0031] Figure 5 for Figure 4 Enlarged view of point C in the middle.

[0032] Figure 6 Schematic diagram of an exploded view of a BDU device in some embodiments.

[0033] Figure 7 for Figure 6 A partial structural schematic diagram of the BDU device is shown.

[0034] Figure 8 for Figure 6 Schematic diagram of the lower shell structure of the BDU device shown.

[0035] The reference numerals in the specific implementation manner are as follows:

[0036] 100, battery pack; 10, liquid cooling plate; 20, box; 20s, installation frame; 30, BDU device; 31, shell; 31a, lower shell; 31b, upper cover; 31c, buckle; m, inclined surface; 31d, avoidance hole; 32, electrical parts; 32a, first main relay; 32b, second main relay; 32c, fuse; 32d, Hall sensor; 32e, pre-charge relay; 32f, pre-charge resistor; 33, thermal conductive component; 33a, metal row; a1, first metal row; a2, second metal row; a3, third metal row; a4, fourth metal row; a5, fifth metal row; 33b, thermal conductive block; b1, buckle; 33c, thermal conductive insulation pad; 33d, thermal conductive insulation layer; 34, first fastener; 35, second fastener; 36, heat dissipation grille; 37, convex hull. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships, if any, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 the present application.

[0039] In addition, if present, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if any, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, if it appears, unless otherwise clearly specified and limited, a first feature “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature “above”, “above” and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature “below”, “below” and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0043] The BDU device is used to directly switch the battery circuit when the battery is overcharged, overheated, overcurrent, etc. to avoid danger. Generally, the BDU device consists of a series of fuses, relays, thermistors, Hall sensors, etc. Its main function is to control current and voltage to ensure the stability and safety of the battery pack. It is an indispensable device in the battery pack. The embodiment of the present application proposes a battery pack to solve the problem of poor heat dissipation of the BDU device in the battery pack.

[0044] The battery module involved in the embodiments of the present application usually includes a plurality of battery cells, and each battery cell is connected in parallel, in series, or in a mixed manner. A battery cell is the smallest unit for electrochemical reaction in a battery pack, and usually includes a shell, an electrode assembly, an electrolyte, etc. The electrode assembly and the electrolyte are arranged in the shell. The electrode assembly usually includes a positive electrode sheet, a negative electrode sheet, and a diaphragm, and the diaphragm is electrically isolated between the positive electrode sheet and the negative electrode sheet. For the specific structure of the positive electrode sheet, the negative electrode sheet, and the diaphragm, please refer to the prior art. The electrode assembly can be a wound type or a stacked type. The battery cell can be rectangular, cylindrical, etc.

[0045] The battery pack in the embodiment of the present application is introduced below.

[0046] Reference Figures 1 to 4 The battery pack 100 provided in the embodiment of the present application includes a liquid cooling plate 10, a battery module and a BDU device 30. The battery module and the BDU device 30 are thermally disposed on the upper surface of the liquid cooling plate 10. The BDU device 30 includes a housing 31, and an electrical component 32 and a heat-conducting component 33 located in the housing 31. The housing 31 is disposed on the liquid cooling plate 10. The heat-conducting component 33 is thermally connected to the electrical component 32, and extends from the bottom of the housing 31 and is thermally connected to the liquid cooling plate 10.

[0047] The liquid cooling plate 10 is arranged at the bottom of the battery module and the BDU device 30 . The liquid cooling plate 10 is used to circulate a heat exchange medium, and the heat of the battery module and the BDU device 30 which are thermally connected to the liquid cooling plate 10 is taken away by the heat exchange medium.

[0048] The housing 31 of the BDU device 30 is generally a plastic shell. Figure 6 The housing 31 includes a lower housing 31a and an upper cover 31b. The electrical components 32 and the heat-conducting components 33 are installed in the lower housing 31a. The upper cover 31b is used to cover the lower housing 31a. The types of electrical components 32 contained in the BDU device 30 can refer to conventional settings. The BDU device 30 is usually equipped with relays and fuses 32c that have a large degree of heat generation.

[0049] The heat conducting component 33 has thermal conductivity, and can be made of metal, ceramic, etc. The heat conducting component 33 is thermally connected to at least part of the electrical components 32, such as relays and fuses with a large degree of heat generation. The heat conducting component 33 extends out of the housing 31 and is thermally connected to the liquid cooling plate 10, and the connection method can be contact, fastening connection, bonding, etc.

[0050] In the actual application of the battery pack 100, the heat-generating electrical components 32 in the BDU device 30 can transfer heat to the external liquid cooling plate 10 through the heat conducting component 33, and the liquid cooling plate 10 is used to dissipate heat from the electrical components 32 in the BDU device 30, and the heat dissipation effect is good. Moreover, the BDU device 30 uses the liquid cooling plate 10 that cools the battery module to dissipate heat for it, and the BDU device 30 itself does not need to be equipped with a liquid cooling structure, which not only improves the utilization rate of the liquid cooling plate 10, but also reduces the volume and cost of the BDU device, which is conducive to the utilization of the internal space of the battery pack 100.

[0051] Understandably, referring to Figure 2 The battery pack 100 generally further includes a box 20, in which the battery module and the BDU device 30 are both arranged. The liquid cooling plate 10 can be constructed as the bottom plate of the box 20, or can be arranged in the box 20. In some embodiments, a plurality of mounting frames 20s are arranged in the box 20, in which the battery module is mounted, and the battery module can be positioned and mounted through the mounting frames 20s.

[0052] In some embodiments, reference Figure 4 , Figure 6 and Figure 7 The heat conducting assembly 33 includes a plurality of metal rows 33a, each of which is heat-conductingly connected to at least one electrical component 32. The housing 31 is provided with an avoidance hole 31d, into which the metal row 33a extends and is heat-conductingly connected to the liquid cooling plate 10.

[0053] The bottom of the shell 31 faces the liquid cooling plate 10, and a avoidance hole 31d is provided at the bottom of the shell 31. The avoidance hole 31d connects the inside and outside of the shell 31, and allows the metal row 33a in the shell 31 to extend into, and is thermally connected to the liquid cooling plate 10 outside the shell 31. A avoidance hole 31d can be provided separately for each metal row 33a, and a avoidance hole 31d can also be provided for multiple metal rows 33a. The metal row 33a extends into the avoidance hole 31d, including the metal row 33a passing through the avoidance hole 31d, and also including the metal row 33a not extending out of the avoidance hole 31d. The metal row 33a is thermally connected to the liquid cooling plate 10, including a direct connection between the two, and also including two indirect connections.

[0054] The metal bar 33 a , such as a copper bar or an aluminum bar, is a sheet-like structure and can be easily bent into a desired shape to adapt to the layout of the electrical components 32 inside the BDU device 30 .

[0055] At this time, the heat-conducting component 33 utilizes the metal row 33 a with high thermal conductivity and good strength to connect the electrical components 32 through heat conduction. The heat-conducting component 33 not only has a good heat-conducting effect, but also has a reliable structure.

[0056] In some embodiments, reference Figures 4 to 7The heat-conducting assembly 33 also includes a heat-conducting block 33b, on which a metal row 33a is supported. The heat-conducting block 33b extends into the avoidance hole 31d and is thermally connected to the liquid cooling plate 10.

[0057] The heat conducting block 33b is supported below the metal row 33a. At this time, the metal row 33a itself does not extend into the avoidance hole 31d, but the heat conducting block 33b extends into the avoidance hole 31d, and the liquid cooling plate 10 and the metal row 33a are thermally connected through the heat conducting block 33b.

[0058] When the metal row 33a is arranged at a higher position and is far from the liquid cooling plate 10, the metal row 33a needs to be extended to a greater length to be thermally connected to the liquid cooling plate 10. For the metal row 33a in a sheet structure, if the extension length is too large, the support strength of the metal row 33a will be reduced, and the metal row 33a is easily bent and deformed by external force and separated from the liquid cooling plate 10, resulting in poor heat dissipation of the electrical components 32. At this time, the metal row 33a is supported by the heat conductive block 33b and is thermally connected to the liquid cooling plate 10 through the heat conductive block 33b, so that the thermal conductivity reliability of the metal row 33a arranged at a higher position can be improved.

[0059] The heat conducting block 33b may be, but is not limited to, a metal block, in which case the heat conducting block 33b has high heat conducting efficiency and high strength. For example, the heat conducting block 33b is an aluminum block. In some embodiments, the heat conducting assembly 33 includes a heat conducting insulating pad 33c, which is disposed between the heat conducting block 33b and the liquid cooling plate 10 and / or between the metal row 33a and the liquid cooling plate 10.

[0060] The thermally conductive insulating pad 33c is a structure with thermal conductivity and insulation, and its material can be but is not limited to silicone, polyimide, etc.

[0061] When the metal row 33a is thermally connected to the liquid cooling plate 10 through the heat conductive block 33b, the heat conductive block 33b is usually a metal block. Both the metal row 33a and the metal block are conductive and can easily conduct the charge carried by the electrical component 32. A thermally conductive insulating pad 33c is arranged between the heat conductive block 33b and the liquid cooling plate 10, which can not only conduct heat but also prevent leakage of electricity to the liquid cooling plate 10.

[0062] Similarly, when the metal bar 33 a extends into the avoidance hole 31 d , a thermally conductive insulating pad 33 c is disposed between the metal bar 33 a and the liquid cooling plate 10 to prevent the metal bar 33 a from leaking electricity to the liquid cooling plate 10 .

[0063] Of course, in other embodiments, in order to avoid leakage to the liquid cooling plate 10, a heat-conducting insulating layer 33d may be provided on the surface of the metal row 33a and / or the liquid cooling plate 10, and the two are connected to each other by heat conduction insulated by the heat-conducting insulating layer 33d. The heat-conducting insulating layer 33d may be covered on the surface of the metal row 33a and / or the liquid cooling plate 10 by bonding, spraying, etc. It is understandable that the heat-conducting insulating layer 33d may be provided only on part of the surface of the metal row 33a and the liquid cooling plate 10 to reduce costs, as long as the function of insulating the metal row 33a and the liquid cooling plate 10 can be achieved.

[0064] In some embodiments, reference Figure 5 A buckle 31c is provided in the housing 31, and a bayonet b1 is provided on the side of the heat conducting block 33b, and the buckle 31c is engaged with the bayonet b1.

[0065] The liquid cooling plate 10 is arranged at the bottom of the BDU device 30, and the side periphery of the heat conducting block 33b is the outer periphery arranged in a vertical manner. At this time, the heat conducting block 33b is firmly installed on the housing 31 by using the clamping connection between the buckle 31c and the clamping port b1, which helps to improve the reliability of heat conduction of the heat conducting component 33.

[0066] In the further embodiment, the buckle 31c can be elastically deformed in a direction intersecting the axis of the avoidance hole 31d.

[0067] The axis of the avoidance hole 31d is substantially perpendicular to the liquid cooling plate 10, corresponding to its opening direction. If the liquid cooling plate 10 is arranged at the bottom of the BDU device 30, the opening direction of the avoidance hole 31d is the vertical direction, and the elastic deformation direction of the buckle 31c is the horizontal direction.

[0068] When installing the heat conducting block 33b, the heat conducting block 33b can be inserted into the corresponding avoidance hole 31d from top to bottom along the vertical direction. During the downward movement of the heat conducting block 33b, the buckle 31c maintains elastic contact with the side of the heat conducting block 33b. At this time, the buckle 31c is under pressure. When the heat conducting block 33b moves downward to the position where the buckle 31c is opposite to the bayonet b1, the pressure on the buckle 31c is released, and the buckle 31c is elastically restored to engage with the bayonet b1. In this way, the buckle 31c can be automatically inserted into the bayonet b1 during the installation of the heat conducting block 33b, which is convenient for operation.

[0069] To further improve the installation convenience of the heat conducting block 33b, the upper surface of the buckle 31c is an inclined surface m that is inclined downward toward the heat conducting block 33b. The inclined surface m makes it easier for the buckle 31c to be inserted into the bayonet b1.

[0070] In some embodiments, reference Figure 6 and Figure 7 The BDU device 30 includes a first fastener 34, which fixes and connects the metal bar 33a and the housing 31 in a vertical direction.

[0071] The first fastener 34 may be a bolt, a pin, a rivet, etc. Taking the first fastener 34 as a bolt as an example, the bolt locks the metal row 33a and the housing 31 in the vertical direction, which means that the bolt is arranged vertically.

[0072] The thermally conductive insulating pad 33c is mostly made of soft rubber materials such as silicone and rubber. The thermally conductive insulating pad 33c will be compressed under the downward pressure of the metal row 33a. In order to prevent the compression rebound force of the thermally conductive insulating pad 33c from causing the metal row 33a to bend and deform, resulting in the metal row 33a being unable to maintain connection with the thermally conductive insulating pad 33c. At this time, the first fastener 34 is used to lock the metal row 33a and the housing 31 in the vertical direction, so that the metal row 33a cannot change its position in the vertical direction. Even if the thermally conductive insulating pad 33c is compressed, the metal row 33a can still be reliably connected to the thermally conductive insulating pad 33c.

[0073] In some embodiments, reference Figure 6 and Figure 7 The BDU device 30 may further include a second fastener 35, which is used to fix the heat-conducting component 33 and the electrical component 32 in a horizontal direction.

[0074] The second fastener 35 may be a bolt, a pin, a rivet, etc. The second fastener 35 horizontally locks the heat conducting component 33 and the electrical component 32 to ensure that the two are effectively connected, and the horizontally arranged second fastener 35 does not increase the height of the BDU device 30 .

[0075] In some embodiments, reference Figure 6 and Figure 7 The electrical component 32 includes a main relay and a fuse 32c, the contacts of the main relay and the contacts of the fuse 32c are located in a horizontal direction, and the heat conduction component 33 is heat-conductingly connected to the contacts.

[0076] The specific functions of the main relay and the fuse 32c are common knowledge in the art and will not be described here. The contact is a connection structure for electrically connecting to an external structure. The main relay and the fuse 32c usually include two contacts.

[0077] First, the contact is usually made of metal, and the heat-conducting component 33 can effectively conduct the heat of the electrical component 32 by connecting with the contact. Second, the contact is located in the horizontal direction, that is, the contact is arranged horizontally, so that the distance between the contact and the liquid cooling plate 10 is shortened, which can effectively shorten the length of the heat-conducting component 33 connected between the contact and the liquid cooling plate 10, reduce the consumables of the heat-conducting component 33, and reduce the space occupied by the BDU device 30 in the height direction, effectively reducing the space occupied by the BDU device 30 in the battery pack 100.

[0078] In some embodiments, reference Figure 6 and Figure 7 The electrical component 32 includes a first main relay 32a and a second main relay 32b, each of which has two contacts located on the same side of the width direction of the BDU device 30, and the fuse 32c has two contacts located at different ends of the width direction. The partial heat-conducting component 33 is arranged on the side of the first main relay 32a and the second main relay 32b facing their contacts. The partial heat-conducting component 33 is arranged on the side of the fuse 32c facing one of the contacts, and the partial heat-conducting component 33 is arranged on the side of the fuse 32c facing the other contact.

[0079] The two contacts of the main relay are usually arranged on the same side. At this time, the two contacts of the first main relay 32a and the second main relay 32b are arranged on the same side in the width direction of the BDU device 30, and the heat conduction component 33 connecting the first main relay 32a and the second main relay 32b is arranged on the same side of the two. In this way, the heat conduction component 33 can be heat-conductingly connected with the first main relay 32a and the second main relay 32b in one area, which not only facilitates the installation of the heat conduction component 33, but also makes the internal layout of the BDU device 30 more compact.

[0080] The two contacts of the fuse 32c are mostly arranged on opposite sides. At this time, the contacts of the fuse 32c are arranged horizontally, part of the heat-conducting component 33 is directly opposite to and connected to one of the contacts of the fuse 32c, and part of the heat-conducting component 33 is directly opposite to and connected to the other contact of the fuse 32c, which can adapt to the structural design of the conventional fuse 32c.

[0081] Specifically in the embodiment, refer to Figure 6 and Figure 7 The heat conducting component 33 includes a first metal row a1, a second metal row a2, a third metal row a3, a fourth metal row a4 and a fifth metal row a5. The electrical component 32 includes a Hall sensor 32d, a first main relay 32a, a pre-charge relay 32e, a second main relay 32b, a fuse 32c and a pre-charge resistor 32f arranged in sequence along the length direction of the BDU device 30. The first metal row a1 connects one of the contacts of the first main relay 32a and the Hall sensor 32d, the second metal row a2 connects the other contact of the first main relay 32a, the third metal row a3 connects one of the contacts of the second main relay 32b, the fourth metal row a4 connects the other contact of the second main relay 32b and one of the contacts of the fuse 32c, and the fifth metal row a5 connects the other contact of the fuse 32c.

[0082] Among them, the pre-charge relay 32e and the pre-charge resistor 32f are common components in this field, and their specific functions are not described here. The pre-charge relay 32e and the pre-charge resistor 32f do not generate much heat. In the embodiment of the present application, in order to reduce the consumables of the metal bar 33a and reduce costs, the pre-charge relay 32e and the pre-charge resistor 32f can be heat-dissipated without the metal bar 33a.

[0083] Specifically, in one embodiment, the first metal row a1, the second metal row a2, the third metal row a3, and the fourth metal row a4 all extend into the corresponding avoidance holes 31d, and they share a thermally conductive insulating pad 33c with a larger area and are thermally connected to the liquid cooling plate 10. The fifth metal row a5 itself does not extend to the corresponding avoidance holes 31d, but is supported on the heat conductive block 33b, and is thermally connected to the liquid cooling plate 10 after the avoidance holes 31d are penetrated through the heat conductive block 33b.

[0084] In some embodiments, reference Figure 6 and Figure 8 A heat dissipation grille 36 is provided on the housing 31, and the heat dissipation grille 36 is arranged opposite to the fuse 32c.

[0085] When the BDU device 30 is in operation, the fuse 32c generates a large amount of heat. At this time, a heat dissipation grille 36 is provided opposite to the fuse 32c. External airflow can perform double heat dissipation on the fuse 32c through the heat dissipation grille 36, thereby further improving the heat dissipation effect of the fuse 32c.

[0086] Specifically, heat dissipation grilles 36 may be provided at both the top and the bottom of the housing 31 .

[0087] In some embodiments, reference Figure 6 A convex bump 37 protruding outward is provided on the top of the housing 31, and the inner side of the convex bump 37 is concave to form an accommodation space. The accommodation space is located above the Hall sensor 32d and accommodates at least part of the Hall sensor 32d.

[0088] Typically, the size of the Hall sensor 32d in the vertical direction is relatively large. When the contacts of the main relay and the fuse 32c are arranged horizontally, the Hall sensor 32d is higher than the main relay and the fuse 32c. At this time, a convex bump 37 is separately provided on the top of the outer shell 31 corresponding to the Hall sensor 32d. The containing space of the convex bump 37 is utilized to accommodate the top portion of the Hall sensor 32d without increasing the installation space above the main relay and the fuse 32c, thereby helping to reduce the overall volume of the device and improve the space utilization rate of the battery pack 100.

[0089] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: include: Liquid cooling plate (10); A battery module and a BDU device (30) are heat-conductingly arranged on the upper surface of the liquid cooling plate (10); and The BDU device (30) comprises a housing (31), and an electrical component (32) and a heat-conducting component (33) located in the housing (31); the housing (31) is arranged on the liquid cooling plate (10); the heat-conducting component (33) is heat-conductingly connected to the electrical component (32), extends from the bottom of the housing (31) and is heat-conductingly connected to the liquid cooling plate (10); The heat-conducting component (33) comprises a plurality of metal rows (33a), each of the metal rows (33a) being heat-conductingly connected to at least one of the electrical components (32); The outer shell (31) is provided with an avoidance hole (31d), and the metal row (33a) extends into the avoidance hole (31d) and is thermally connected to the liquid cooling plate (10).

2. The battery pack according to claim 1, characterized in that: The heat-conducting assembly (33) further comprises a heat-conducting block (33b), on which the metal row (33a) is supported, and the heat-conducting block (33b) extends into the avoidance hole (31d) and is heat-conductingly connected to the liquid cooling plate (10).

3. The battery pack according to claim 2, characterized in that: The heat-conducting component (33) comprises a heat-conducting insulating pad (33c), and the heat-conducting insulating pad (33c) is arranged between the heat-conducting block (33b) and the liquid cooling plate (10) and / or between the metal row (33a) and the liquid cooling plate (10); and / or, A heat-conducting insulating layer (33d) is provided on the surface of at least one of the metal row (33a) and the liquid cooling plate (10), and the two are heat-conductingly connected in an insulated manner via the heat-conducting insulating layer (33d).

4. The battery pack according to claim 2, characterized in that: A buckle (31c) is provided in the shell (31), a bayonet (b1) is provided on the side of the heat conducting block (33b), and the buckle (31c) is engaged with the bayonet (b1); The buckle (31c) can be elastically deformed in a direction intersecting with the axis of the avoidance hole (31d).

5. The battery pack according to claim 1, characterized in that: The BDU device (30) comprises a first fastener (34), wherein the first fastener (34) fastens and connects the metal bar (33a) and the housing (31) in a vertical direction.

6. The battery pack according to claim 1, characterized in that: The BDU device (30) comprises a second fastener (35), wherein the second fastener (35) is used to fix the heat-conducting component (33) and the electrical component (32) in a horizontal direction.

7. The battery pack according to claim 1, characterized in that: The electrical component (32) comprises a main relay and a fuse (32c), the contacts of the main relay and the contacts of the fuse (32c) are located in a horizontal direction, and the heat conduction component (33) is heat-conductingly connected to the contacts.

8. The battery pack according to claim 7, characterized in that: The electrical component (32) includes a first main relay (32a) and a second main relay (32b), wherein the first main relay (32a) and the second main relay (32b) each have two contacts located at the same end in the width direction of the BDU device (30); The fuse (32c) has two contacts located at two different ends in the width direction; Part of the heat-conducting component (33) is arranged on the same side of the first main relay (32a) and the second main relay (32b) facing their contacts; part of the heat-conducting component (33) is arranged on the side of the fuse (32c) facing one of the contacts, and part of the heat-conducting component (33) is arranged on the side of the fuse (32c) facing the other contact.

9. The battery pack according to claim 8, characterized in that: The heat-conducting component (33) comprises a first metal row (a1), a second metal row (a2), a third metal row (a3), a fourth metal row (a4) and a fifth metal row (a5); The electrical component (32) includes a Hall sensor (32d), the first main relay (32a), a pre-charge relay (32e), the second main relay (32b), the fuse (32c) and a pre-charge resistor (32f) arranged in sequence along the length direction of the BDU device (30); the first metal bar (a1) connects one of the contacts of the first main relay (32a) and the Hall sensor (32d), and the second metal bar (a2) connects the other contact of the first main relay (32a); the third metal bar (a3) ​​connects one of the contacts of the second main relay (32b), the fourth metal bar (a4) connects the other contact of the second main relay (32b) and one of the contacts of the fuse (32c), and the fifth metal bar (a5) connects the other contact of the fuse (32c).

10. The battery pack according to claim 9, characterized in that: The housing (31) is provided with a heat dissipation grille (36), and the heat dissipation grille (36) is arranged opposite to the fuse (32c); The top of the housing (31) is provided with a convex bump (37) protruding outwards, and the inner side of the convex bump (37) is concave to form an accommodation space, which is located above the Hall sensor (32d) and accommodates at least a portion of the Hall sensor (32d).

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