Battery pack

Abstract

The utility model discloses a battery pack which comprises a lower shell and BDU modules, the BDU modules comprise a first BDU module and a second BDU module, and the first BDU module and the second BDU module are independently fixed in the lower shell and are arranged at intervals. According to the battery pack disclosed by the utility model, the BDU modules of the battery pack are detachably arranged and are respectively overhauled, so that the space structure of the battery pack can be more reasonably utilized, and meanwhile, the maintenance and overhaul cost of the battery pack is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery pack. Background Art

[0002] In the related technologies, with the rapid development of power battery technology, the requirements for the energy capacity density of battery packs have increased significantly. Since the battery energy density of the battery cells themselves is limited, it is necessary to rationally plan the spatial layout of the components in the battery pack to install more battery cells. In order to meet the cost reduction needs of BDU (Battery Disconnect Unit) production, the industry currently uses more integrated BDU modules, and a certain amount of space needs to be reserved in the battery pack to install the BDU module. When the internal components of the BDU module are damaged, the BDU module needs to be disassembled as a whole for repair and replacement, which greatly increases the maintenance cost. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack, the BDU modules of which can be disassembled and arranged and repaired separately, so as to more reasonably utilize the spatial structure of the battery pack and reduce the maintenance and repair costs of the battery pack.

[0004] According to an embodiment of the utility model, the battery pack includes: a lower shell and a BDU module, the BDU module includes a first BDU module and a second BDU module, the first BDU module and the second BDU module are independently fixed in the lower shell and arranged at intervals.

[0005] According to the battery pack of the embodiment of the utility model, by setting the BDU module as the first BDU module and the second BDU module respectively fixed in the lower shell of the battery pack, the first BDU module and the second BDU module can be arranged at different positions in the lower shell according to the specific structure of the battery pack, so that the installation of the BDU module and the connection of the BDU module with other components are more convenient, and the spatial structure of the battery pack can be more reasonably utilized, which is conducive to the assembly of the battery pack. At the same time, when the internal components of the BDU module need to be repaired, the first BDU module and the second BDU module can be repaired or replaced respectively, without the need to repair and replace the entire BDU module, thereby reducing the repair cost of the BDU module, and thus reducing the maintenance cost of the battery pack.

[0006] According to some embodiments of the present invention, the first BDU module is fixed to the front of the lower housing, and the second BDU module is fixed to the rear of the lower housing.

[0007] According to some embodiments of the present invention, the battery pack further includes a mounting bracket, wherein the mounting bracket is connected to the lower shell, and the first BDU module is located below the mounting bracket and connected to the mounting bracket.

[0008] In some embodiments of the utility model, the lower shell body has a mounting beam, one end of the mounting bracket in the width direction has a first mounting lug, the first mounting lug is connected to the mounting beam, and the first mounting lug has a wire buckle; and / or, one end of the mounting bracket in the length direction has a second mounting lug, the second mounting lug has a wire clip notch; and / or, the lower shell body has a side beam, one end of the mounting bracket in the width direction has a downwardly bent mounting fold, the mounting fold is connected to the side beam; and / or, the mounting bracket has a plurality of protrusions spaced apart along the length direction of the mounting bracket, and the protrusions have through holes.

[0009] In some embodiments of the present invention, the battery pack also includes a cold plate and a bottom guard plate, wherein the cold plate is disposed below the lower shell and connected to the lower shell, and the cold plate has a avoidance opening disposed opposite to the first BDU module; the bottom guard plate is located below the cold plate and is detachably connected to the cold plate.

[0010] In some embodiments of the present invention, the battery pack further includes an external copper busbar, and a connection point between the external copper busbar and the first BDU module and a connection point between the first BDU module and the mounting bracket are both located at the bottom of the first BDU module.

[0011] According to some embodiments of the utility model, a maintenance port is provided on the side wall of the lower shell, the second BDU module is arranged inside the maintenance port and opposite to the maintenance port, and a maintenance port cover is provided at the maintenance port, and the maintenance port cover is used to open or close the maintenance port.

[0012] In some embodiments of the present invention, the second BDU module includes a second shell, the second shell includes a shell body and a cover body, the opening of the shell body faces the maintenance port, and the cover body is detachably arranged at the opening for opening or closing the opening.

[0013] According to some embodiments of the present invention, the second BDU module is connected to the lower shell through a plurality of fasteners, and the second BDU module is provided with connecting holes for the fasteners to pass through, and at least two of the plurality of connecting holes have different apertures.

[0014] According to some embodiments of the utility model, the first BDU module includes a first shell and a main positive and main negative relay, a pre-charge relay, and a pre-charge resistor arranged in the first shell, and the first shell is connected to the lower shell; and / or the second BDU module includes a second shell and a fuse and a shunt arranged in the second shell.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a top view of a schematic diagram of the installation of a first BDU module according to an embodiment of the utility model;

[0018] Figure 2 is a bottom view of a schematic diagram of the installation of a first BDU module according to an embodiment of the utility model;

[0019] Figure 3 is a bottom view of a battery pack according to an embodiment of the utility model;

[0020] Figure 4 is a perspective view of a first BDU module according to an embodiment of the utility model;

[0021] Figure 5 is a three-dimensional diagram of the internal structure of a first BDU module according to an embodiment of the utility model;

[0022] Figure 6 is a perspective view of a second BDU module according to an embodiment of the utility model;

[0023] Figure 7 It is a three-dimensional diagram of the internal structure of the second BDU module according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] 1000, battery pack;

[0026] 1. Lower shell; 11. Install cross beam; 12. Side beam;

[0027] 2. BDU module; 21. First BDU module; 211. Mounting hole; 212. First housing; 213. Main positive relay; 214. Main negative relay; 215. Reinforcement rib; 22. Second BDU module; 221. Second housing; 2211. Housing body; 2212. Cover; 222. Connection hole; 223. Fuse; 224. Shunt;

[0028] 3. Mounting bracket; 31. First mounting lug; 311. Wire clip; 32. Second mounting lug; 321. Wire clip notch; 33. Protrusion; 331. Through hole;

[0029] 4. Cold plate; 41. Avoidance;

[0030] 5. Bottom guard plate;

[0031] 6. External copper busbar. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 7 A battery pack 1000 according to an embodiment of the present invention is described.

[0036] like Figure 1 and Figure 3 As shown, the battery pack 1000 according to an embodiment of the present invention includes a lower shell 1 and a BDU module 2.

[0037] Specifically, Figure 3 As shown, combined Figure 4 and Figure 6 The BDU module 2 includes a first BDU module 21 and a second BDU module 22, which are independently fixed in the lower shell 1 and arranged at intervals. The material of the lower shell 1 can be a rolled steel profile, which has low production cost and can ensure processing accuracy and quality. The BDU module 2 is set to be split, so that each BDU module 2 is reduced in volume and weight, which is conducive to the installation of the first BDU module 21 and the second BDU module 22 and the assembly of the battery pack 1000. The components with different functions in the BDU module 2 are respectively arranged in the first BDU module 21 and the second BDU module 22. According to the specific structure and actual use of the battery pack 1000 and the vehicle using the battery pack 1000, the first BDU module 21 and the second BDU module 22 can be arranged at different positions in the lower shell 1 of the battery pack 1000, so that the installation of the BDU module 2 and the connection between the BDU module 2 and other components are more convenient, and the spatial structure of the battery pack 1000 can be more reasonably utilized. The first BDU module 21 and the second BDU module 22 are independent components. When the internal components of the BDU module 2 need to be repaired, the first BDU module 21 and the second BDU module 22 can be repaired or replaced separately without repairing or replacing the entire BDU module 2, thereby reducing the maintenance cost of the BDU module 2 and further reducing the maintenance cost of the battery pack 1000.

[0038] According to the battery pack 1000 of the embodiment of the utility model, by setting the BDU module 2 as the first BDU module 21 and the second BDU module 22 respectively fixed in the lower shell 1 of the battery pack 1000, the first BDU module 21 and the second BDU module 22 can be arranged at different positions in the lower shell 1 according to the specific structure of the battery pack 1000, so that the installation of the BDU module 2 and the connection between the BDU module 2 and other components are more convenient, and the spatial structure of the battery pack 1000 can be more reasonably utilized, which is conducive to the assembly of the battery pack 1000. At the same time, when the internal components of the BDU module 2 need to be repaired, the first BDU module 21 and the second BDU module 22 can be repaired or replaced respectively, without the need to repair and replace the entire BDU module 2, thereby reducing the repair cost of the BDU module 2, and further reducing the maintenance cost of the battery pack 1000.

[0039] In some embodiments of the present invention, Figure 3 As shown, the first BDU module 21 is fixed to the front of the lower housing 1, and the second BDU module 22 is fixed to the rear of the lower housing 1. The first BDU module 21 and the second BDU module 22 are respectively arranged at diagonal positions of the lower housing 1, which makes it more convenient to connect the internal components of the first BDU module 21 and the second BDU module 22 with other components such as the power supply components of the battery pack 1000, facilitate the installation of the BDU module 2, and reasonably arrange and utilize the structural space of the battery pack 1000, which is beneficial to the assembly of the battery pack 1000.

[0040] In some embodiments of the present invention, Figure 1 and Figure 2As shown, the battery pack 1000 further includes a mounting bracket 3, which is connected to the lower shell 1, and the first BDU module 21 is located below the mounting bracket 3 and connected to the mounting bracket 3. A plurality of mounting holes 211 for fasteners to pass through are provided at both ends of the first BDU module 21, and the mounting bracket 3 has holes corresponding to the plurality of mounting holes 211 of the first BDU module 21. The first BDU module 21 is connected to the mounting bracket 3 at the mounting holes 211 by fasteners such as bolts, etc., and the structure is simple and the fasteners can be flexibly disassembled, which is convenient for loading and unloading, and is conducive to the maintenance of the first BDU module 21. Preferably, the mounting bracket 3 is detachably connected to the lower shell 1. When assembling the battery pack 1000, the first BDU module 21 can be first connected and fixed to the mounting bracket 3, and then the mounting bracket 3 can be connected to the lower shell 1, thereby realizing the detachable connection between the first BDU module 21 and the lower shell 1, which is convenient for loading and unloading of the first BDU module 21. When the internal components of the BDU module 2 are damaged, the connection between the mounting bracket 3 and the lower shell 1 can be removed, and the first BDU module 21 and the mounting bracket 3 can be removed from the battery pack 1000 for repair or replacement. There is no need to inspect or replace the entire battery pack 1000, which simplifies the inspection and maintenance steps and reduces the cost of inspection and maintenance, thereby reducing the economic loss caused by the scrapping of the entire battery pack 1000 due to the inability to repair the BDU module 2 alone.

[0041] In some embodiments of the present invention, Figure 1 As shown, the lower shell 1 has a mounting beam 11, and the mounting beam 11 can be provided with a rivet nut for mounting and fixing the mounting bracket 3. One end of the mounting bracket 3 in the width direction has a first mounting lug 31, and the first mounting lug 31 is connected to the mounting beam 11. The first mounting lug 31 and the mounting beam 11 are provided with matching mounting holes, and the mounting bracket 3 can be connected to the rivet nut of the mounting beam 11 at the mounting hole through fasteners such as bolts. The first BDU module 21 has a sampling and control harness, and the first mounting lug 31 has a wire clip 311 for fixing the sampling and control harness of the first BDU module 21. In addition, one end of the mounting bracket 3 in the length direction has a second mounting lug 32, and the second mounting lug 32 has a wire clip notch 321. The concave wire clip notch 321 can be connected with the sheet metal clip for fixing the sampling and control harness, so as to play a fixing and limiting role. By providing the wire clamping buckle 311 and the wire clamping notch 321 , the sampling and control wire harness of the first BDU module 21 can be protected, and the sampling and control wire harness of the first BDU module 21 can also be made more regular.

[0042] In some embodiments of the present invention, Figure 1As shown, the lower shell 1 has a side beam 12, and one end of the mounting bracket 3 in the width direction has a downwardly bent mounting edge, and a reinforcement point is provided on the bending arc of the mounting edge, which can enhance the structural strength of the mounting bracket 3. The mounting edge is connected to the side beam 12, and matching mounting holes are provided on the mounting edge and the side beam 12. Fasteners such as bolts can be used at the mounting holes to make the mounting edge and the inner side of the side beam 12 fit and fix, so that the connection between the mounting bracket 3 and the lower shell 1 is more stable.

[0043] In some embodiments of the present invention, Figure 1 As shown, the mounting bracket 3 has a plurality of protrusions 33 spaced apart along the length direction of the mounting bracket 3, which can improve the overall structural strength of the mounting bracket 3. The protrusions 33 have through holes 331, which can reduce the contact area between the mounting bracket 3 and the first BDU module 21 while improving the structural strength, which is beneficial to the heat dissipation of the first BDU module 21.

[0044] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the battery pack 1000 also includes a cold plate 4 and a bottom guard plate 5. The cold plate 4 is arranged below the lower shell 1 and connected to the lower shell 1, which can cool the battery pack 1000 and ensure the thermal management performance of the battery pack 1000. The cold plate 4 and the lower shell 1 can be first coated with glue and then fixed with blind rivets, which can ensure the airtightness of the battery pack 1000. The structure is simple and the connection is stable, which is also conducive to improving the assembly efficiency. The cold plate 4 has a avoidance opening 41 arranged opposite to the first BDU module 21, which can provide sufficient effective space for the installation of the first BDU module 21. In addition, the bottom guard plate 5 is located below the cold plate 4 and is detachably connected to the cold plate 4 to protect the battery pack 1000 from being bumped. The bottom guard plate 5 and the cold plate 4 can be connected with fasteners such as rivet bolts for easy loading and unloading. A sealing foam is also provided between the bottom guard plate 5 and the cold plate 4 , which can achieve the air tightness of the battery pack 1000 while keeping the battery pack 1000 warm, thereby preventing the operating temperature of the battery pack 1000 from being too low or too high, thereby causing the performance of the battery pack 1000 to deteriorate.

[0045] In some embodiments of the present invention, Figure 1 and Figure 2As shown, the battery pack 1000 also includes an external copper busbar 6, which is respectively connected to the two ends of the first BDU module 21 along the length direction. One end of the first BDU module 21 has three external copper busbar 6 fixing points, which are the output positive, output negative and battery negative fixing points, and the other end is the battery positive fixing point. When assembling the battery pack 1000, the first BDU module 21 can be connected to the mounting bracket 3 and the external copper busbar respectively, and then the first BDU module 21, the external copper busbar and the mounting bracket 3 can be connected and fixed to the lower shell 1 as a whole through the mounting bracket 3. The connection point between the external copper busbar 6 and the first BDU module 21 and the connection point between the first BDU module 21 and the mounting bracket 3 are both located at the bottom of the first BDU module 21. When connecting the external copper busbar and the mounting bracket 3 to the first BDU module 21, both can be operated from the bottom of the first BDU module 21, which is convenient for installation.

[0046] In some embodiments of the utility model, a maintenance port is provided on the side wall of the lower housing 1, and a maintenance port cover is provided at the maintenance port. The maintenance port cover is used to open or close the maintenance port. When the maintenance port cover closes the maintenance port, the maintenance port cover has a sealing function, which can ensure the airtightness of the battery pack 1000. The second BDU module 22 is arranged inside the maintenance port and opposite to the maintenance port, so that the second BDU module 22 can be easily inspected and maintained from the maintenance port of the lower housing 1, thereby realizing the maintainability of the battery pack 1000, simplifying the inspection and maintenance steps, and reducing the cost of inspection and maintenance, thereby reducing the economic loss caused by the scrapping of the entire battery pack 1000 due to the inability to repair the second BDU module 22 alone.

[0047] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, the second BDU module 22 includes a second shell 221, and the second shell 221 includes a shell body 2211 and a cover body 2212. The opening of the shell body 2211 faces the maintenance port, and the cover body 2212 is detachably arranged at the opening for opening or closing the opening. When a component in the second BDU module 22 fails or is damaged, after the cover body 2212 is removed at the maintenance port of the lower shell 1, the components in the second BDU module 22 can be removed separately through the opening of the shell body 2211 for repair or replacement, without the need to disassemble the entire second BDU module 22 for inspection or replacement. While simplifying the inspection steps, it also reduces the inspection cost of the second BDU module 22, thereby reducing the maintenance cost of the battery pack 1000.

[0048] In some embodiments of the present invention, Figure 6 and Figure 7As shown, the second BDU module 22 is connected to the lower housing 1 by multiple fasteners, which is simple and convenient to install. The fasteners can be flexibly disassembled and easily replaced. The second BDU module 22 is provided with a connection hole 222 for the fastener to pass through. At least two of the multiple connection holes 222 have different apertures, which can prevent wrong installation when the second BDU module 22 is connected to the lower housing 1.

[0049] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the first BDU module 21 includes a first shell 212 and a main positive relay 213, a main negative relay 214, a pre-charge relay, and a pre-charge resistor arranged in the first shell 212, and the first shell 212 is connected to the lower shell 1. The first shell 212 of the first BDU module 21 can be detachably connected to the mounting bracket 3 in the form of a fastener, and the mounting bracket 3 can be detachably connected to the lower shell 1, thereby realizing the detachable connection between the first shell 212 and the lower shell 1, and the first BDU module 21 can be removed from the battery pack 1000 separately for repair or replacement, thereby reducing the maintenance cost of the battery pack 1000. Among them, the main positive relay 213 and the main negative relay 214 are vertical relays, and the main positive relay 213 and the main negative relay 214 are arranged at intervals in the length direction of the first BDU module 21, and are fixed to each other in the fixing groove in the first shell 212, so that the fixing grooves of the main positive relay 213 and the main negative relay 214 can be staggered, thereby saving the space of the first BDU module 21 in the length direction. The first shell 212 has an opening and a limit protection cover, and the limit protection cover is arranged on the opening of the first shell 212. When the first BDU module 21 is installed, the mounting bracket 3 and the limit protection cover are attached and connected to the first shell 212. The first shell 212 is provided with a partition and a reinforcing rib 215, which can not only increase the electrical clearance and creepage distance but also clamp the limit protection cover to make the limit protection cover more stable. In addition, the main positive relay 213 and the main negative relay 214 have an output terminal connection copper bar on the side facing the opening, and the output terminal connection copper bar is a high-low dislocated special-shaped bending structure. The inner copper bar of the battery pack 1000 is connected to the output terminal connection copper bar of the main positive relay 213 and the main negative relay 214, and the inner copper bar of the battery pack 1000 is a soft copper bar with a three-in-one installation structure, which is convenient for connection and can save more internal space of the first BDU module 21.

[0050] In some embodiments of the present invention, Figure 2The first BDU module 21 shown also includes a connector and a sampling and control harness. The connector is located at one end of the first BDU module 21 where the positive copper busbar fixing point of the battery is provided. Its interface is a left-right plug-in type, which is convenient for loading and unloading during maintenance. The sampling and control harness of the first BDU module 21 is used to control the main positive relay 213, the main negative relay 214, the pre-charge relay and the high-voltage sampling.

[0051] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, the second BDU module 22 includes a second housing 221 and a fuse 223 and a shunt 224 arranged in the second housing 221. The fuse 223 and the shunt 224 are respectively provided with two inserts for fixing bolts, and the inserts of the fuse 223 and the inserts of the shunt 224 are respectively arranged in a staggered manner in height and left and right, so as to facilitate the front and back arrangement of the fuse 223 and the shunt 224 and save the arrangement space. At the same time, when maintenance is required, the fuse 223 and the shunt 224 can be disassembled and repaired successively after the cover 2212 of the second BDU module 22 is removed. In addition, a protruding structure is provided at the bottom of the second housing 221, and the protruding structure protrudes toward the side away from the fuse 223, and a concave portion is provided at a position opposite to the protruding structure on the side facing the fuse 223, thereby being compatible with the sizes of multiple models of fuses 223, increasing the freedom of selection and replacement of the fuse 223, and facilitating the heat dissipation of the internal components of the second BDU module 22. An L-shaped slot is provided on the lower side of the diverter 224 in the second BDU module 22 to provide sufficient moving space when the diverter 224 is disassembled and to facilitate the connection of the diverter 224 to the sampling and control harnesses.

[0052] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, the second BDU module 22 also has an external copper busbar connection point, which is symmetrically located on two opposite sides of the second BDU module 22, so that the external copper busbar connection points can share the copper busbar and save space and materials. In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: Lower housing; The BDU module includes a first BDU module and a second BDU module, wherein the first BDU module and the second BDU module are independently fixed in the lower housing and are spaced apart.

2. The battery pack according to claim 1, characterized in that: The first BDU module is fixed to the front of the lower housing, and the second BDU module is fixed to the rear of the lower housing.

3. The battery pack according to claim 1, characterized in that: Also includes: A mounting bracket is connected to the lower shell, and the first BDU module is located below the mounting bracket and connected to the mounting bracket.

4. The battery pack according to claim 3, characterized in that: The lower shell has a mounting beam inside, and one end of the mounting bracket in the width direction has a first mounting lug, the first mounting lug is connected to the mounting beam, and the first mounting lug has a wire buckle; And / or, one end of the mounting bracket in the length direction has a second mounting lug, and the second mounting lug has a wire clamping notch; And / or, the lower shell has a side beam inside, one end of the mounting bracket in the width direction has a mounting folded edge bent downward, and the mounting folded edge is connected to the side beam; And / or, the mounting bracket has a plurality of protrusions spaced apart along the length direction of the mounting bracket, and the protrusions have through holes.

5. The battery pack according to claim 3, characterized in that: Also includes: A cold plate, the cold plate is arranged below the lower shell and connected to the lower shell, and the cold plate has a avoidance opening arranged opposite to the first BDU module; A bottom guard plate is located below the cold plate and is detachably connected to the cold plate.

6. The battery pack according to claim 3, characterized in that: Also includes: An external copper busbar, wherein a connection point between the external copper busbar and the first BDU module and a connection point between the first BDU module and the mounting bracket are both located at the bottom of the first BDU module.

7. The battery pack according to claim 1, characterized in that: A maintenance port is provided on the side wall of the lower shell, the second BDU module is arranged inside the maintenance port and opposite to the maintenance port, a maintenance port cover is provided at the maintenance port, and the maintenance port cover is used to open or close the maintenance port.

8. The battery pack according to claim 7, characterized in that: The second BDU module includes a second shell, which includes a shell body and a cover body. The opening of the shell body faces the maintenance port, and the cover body is detachably arranged at the opening for opening or closing the opening.

9. The battery pack according to claim 1, characterized in that: The second BDU module is connected to the lower shell through a plurality of fasteners. The second BDU module is provided with connection holes for the fasteners to pass through. At least two of the plurality of connection holes have different apertures.

10. The battery pack according to claim 1, characterized in that: The first BDU module includes a first housing and a main positive relay, a main negative relay, a pre-charge relay, and a pre-charge resistor arranged in the first housing, and the first housing is connected to the lower housing; And / or, the second BDU module includes a second shell and a fuse and a shunt arranged in the second shell.

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