Bottom plate assembly and battery pack with same

Abstract

The utility model provides a bottom plate assembly and a battery pack provided with the same. The bottom plate assembly comprises a liquid cooling plate, the bottom plate and the liquid cooling plate are arranged at intervals; the bracket is arranged between the liquid cooling plate and the bottom plate, the bracket is provided with a fixed end and a connecting end which are oppositely arranged, and the fixed end is connected with the liquid cooling plate; the sealing piece is located between the support and the bottom plate, one end of the sealing piece abuts against the support, the other end of the sealing piece abuts against the bottom plate, and the sealing piece is matched with the support to support the gap between the liquid cooling plate and the bottom plate; and the fastener is connected with the connecting end of the bracket, and the fastener is matched with the bracket to connect the bottom plate and the liquid cooling plate. According to the technical scheme provided by the utility model, the problems that the bottom plate structure is complex to process and low in strength due to the fact that pits need to be processed on the bottom plate can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a base plate assembly and a battery pack having the same. Background Art

[0002] At present, with society's increasing emphasis on sustainable development and environmental protection, the use of lithium batteries can not only reduce dependence on fossil fuels, but also reduce greenhouse gas emissions. The above advantages have led to their widespread use in many fields. Before lithium battery packs are put into use, the manufacturing process of the battery packs is extremely important, which not only affects the service life of the battery packs, but also affects the safety of the battery packs.

[0003] In the prior art, when installing a battery pack base plate and cold plate, the two are fixed together using fasteners. Because there is a gap between the base plate and the cold plate, and the fasteners require a rigid connection, a recessed groove must be machined into the base plate to allow the fasteners, base plate, and cold plate to contact each other, ensuring a stable attachment of the base plate to the cold plate. This design requires a special mold to be used for the recessed grooves, complicating the process and increasing costs. Utility Model Content

[0004] The utility model provides a base plate assembly and a battery pack having the same, so as to solve the problem in the prior art that pits need to be processed on the base plate, resulting in complex base plate structure processing and low strength.

[0005] According to one aspect of the present invention, a base plate assembly is provided, which includes: a liquid cooling plate; a base plate, which is spaced apart from the liquid cooling plate; a bracket, which is arranged between the liquid cooling plate and the base plate, the bracket having a fixed end and a connecting end relatively arranged, and the fixed end is connected to the liquid cooling plate; a seal, which is located between the bracket and the base plate, one end of the seal abuts against the bracket, and the other end of the seal abuts against the base plate, and the seal cooperates with the bracket to support the gap between the liquid cooling plate and the base plate; a fastener, which is connected to the connecting end of the bracket, and the fastener cooperates with the bracket to connect the base plate and the liquid cooling plate.

[0006] Furthermore, the bracket includes a main body and a support portion, the support portion is located on the outer periphery of the main body, and the sealing member is sleeved on the main body and located between the support portion and the bottom plate.

[0007] Furthermore, the main body includes a first supporting section and a second supporting section connected in sequence, and there is a stepped surface between the first supporting section and the second supporting section. The first supporting section is arranged close to the liquid cooling plate, and the sealing member is sleeved on the second supporting section. The stepped surface forms a supporting portion, and one end of the first supporting section close to the liquid cooling plate forms a fixed end, and the end of the first supporting section away from the liquid cooling plate forms a connecting end.

[0008] Furthermore, a positioning structure is provided between the fixed end and the liquid cooling plate.

[0009] Furthermore, a positioning groove is provided on one side of the liquid cooling plate close to the bottom plate, and a positioning protrusion is provided on the end surface of the fixed end. The positioning protrusion is located in the positioning groove, and the positioning protrusion cooperates with the positioning groove to form a positioning structure.

[0010] Furthermore, the base plate has a mounting hole, and the connecting end extends from the mounting hole to a side of the base plate away from the liquid cooling plate and abuts against the fastener.

[0011] Furthermore, the base plate has a mounting hole, and the base plate assembly also includes a bushing, which is located in the mounting hole. The fastener passes through the bushing and is connected to the connecting end. One end of the bushing abuts the connecting end, and the other end of the bushing abuts the fastener.

[0012] Furthermore, the sealing member includes a sealing ring, which is interference-fitted with the second supporting section, and the sealing ring can seal the gap between the bracket and the base plate.

[0013] Furthermore, the sealing member includes a plurality of sealing rings, and the plurality of sealing rings are sequentially sleeved on the second supporting section.

[0014] Furthermore, the bottom plate is a flat plate structure.

[0015] According to another aspect of the present invention, a battery pack is provided, which includes: a box body, the box body including a cover plate, a surrounding plate and the above-mentioned bottom plate assembly, the surrounding plate is arranged along the edge of the bottom plate assembly, and the cover plate, the surrounding plate and the bottom plate assembly cooperate to form a accommodating cavity; a battery cell is arranged in the accommodating cavity.

[0016] By applying the technical solution of the present invention, the fixed end of the bracket is connected to the liquid cooling plate, and the connecting end of the bracket is connected to the fastener to connect the base plate and the liquid cooling plate. One end of the seal abuts the bracket, and the other end of the seal abuts the base plate. The seal cooperates with the bracket to support the gap between the liquid cooling plate and the base plate. Through the above arrangement, the bracket and the seal can fill the distance between the base plate and the cold plate, shorten the connection distance between the two, and realize a hard connection between the base plate and the liquid cooling plate; the above structure can reduce or eliminate the pit structure on the base plate, which can simplify or omit the process of machining pits on the base plate, while improving the structural strength of the base plate, and can also improve the buffering effect and load capacity of the base plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 Shows a schematic structural diagram of the battery pack provided by the present utility model;

[0019] Figure 2 Shown Figure 1 A partial enlarged view of point A in the middle;

[0020] Figure 3 Shows a front view of the bracket provided by the utility model;

[0021] Figure 4 The figure shows a structural diagram of the bracket provided by the present invention.

[0022] The above drawings include the following reference numerals:

[0023] 10. Liquid cooling plate;

[0024] 11. Positioning slot;

[0025] 12. First liquid cooling plate; 13. Second liquid cooling plate;

[0026] 14. Cooling channel;

[0027] 20. Base plate; 21. Mounting hole;

[0028] 30. Bracket;

[0029] 301, fixed end; 3011, protrusion;

[0030] 302, connection end;

[0031] 31. Main body; 311. First supporting section; 312. Second supporting section;

[0032] 32. Support part;

[0033] 40. Seals;

[0034] 50. Fasteners;

[0035] 60. Battery cell;

[0036] 01. Bottom plate assembly;

[0037] 02. Battery pack. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] like Figures 1 to 3 As shown, an embodiment of the present invention provides a base plate assembly 01, which includes: a liquid cooling plate 10, a base plate 20, a bracket 30 and a seal 40. The base plate 20 is spaced apart from the liquid cooling plate 10. The bracket 30 is arranged between the liquid cooling plate 10 and the base plate 20. The bracket 30 has a fixed end 301 and a connecting end 302 arranged opposite to each other. The fixed end 301 is connected to the liquid cooling plate 10. The seal 40 is located between the bracket 30 and the base plate 20. One end of the seal 40 abuts against the bracket 30, and the other end of the seal 40 abuts against the base plate 20. The seal 40 cooperates with the bracket 30 to support the gap between the liquid cooling plate 10 and the base plate 20. The fastener 50 is connected to the connecting end 302 of the bracket 30. The fastener 50 cooperates with the bracket 30 to connect the base plate 20 and the liquid cooling plate 10.

[0040] Using the technical solution of the present invention, the fixed end 301 of the bracket 30 is connected to the liquid cooling plate 10, and the connecting end 302 of the bracket 30 is connected to the fastener 50 to connect the base plate 20 and the liquid cooling plate 10. One end of the seal 40 abuts the bracket 30, and the other end of the seal 40 abuts the base plate 20. The seal 40 cooperates with the bracket 30 to support the gap between the liquid cooling plate 10 and the base plate 20. Through this arrangement, the bracket 30 and the seal 40 can fill the distance between the base plate 20 and the liquid cooling plate 10, shortening the connection distance between the two and achieving a hard connection between the base plate 20 and the liquid cooling plate 10. This structure can reduce or eliminate the pit structure on the base plate 20, thereby simplifying or omitting the process of machining the pit on the base plate 20, while improving the structural strength of the base plate 20 and enhancing the cushioning effect and load capacity of the base plate assembly 01.

[0041] In the present application, there is no limitation on the axial size and number of layers of the seal 40 , and they can be selected according to the requirements of actual working conditions.

[0042] The material of the seal 40 is not limited and may be made of rubber, silicone, or a composite material of rubber and other plastics, as long as it can achieve a sealing effect and prevent impurities in the outside air from entering the device and damaging the components.

[0043] Specifically, the fastener 50 may be a bolt, a pin, a rivet or other fastening structures.

[0044] Furthermore, there is no limitation on the shape and quantity of the seal 40. There may be multiple seals 40, which may be arranged between the bracket 30 and the base plate 20 at circumferential intervals along the bracket 30; or, multiple seals 40 may be stacked in the vertical direction; or, the seal 40 may also be arranged as a continuous closed annular structure.

[0045] Specifically, the sealing member 40 includes a plurality of sealing rings, which are sequentially sleeved on the second support section 312. Through the above arrangement, the number of sealing rings can be increased to increase the overall sealing effect and support effect of the sealing member 40.

[0046] like Figure 1 and Figure 2 As shown, the bracket 30 includes a main body 31 and a support portion 32. The support portion 32 is located on the outer periphery of the main body 31. The seal 40 is sleeved on the main body 31 and located between the support portion 32 and the base plate 20. Through this arrangement, the support portion 32 can provide support for the seal 40 when the base plate 20 and the liquid cooling plate 10 are fixed, thereby improving the support strength of the bracket 30 for the gap between the liquid cooling plate 10 and the base plate 20. At the same time, compared with the prior art in which the seal 40 is arranged on the outer ring of the bracket 30, this solution can reduce the overall radial space between the bracket 30 and the seal 40, avoiding interference with other components and improving the adaptability of the base plate structure.

[0047] In this solution, the specific structure of the support portion 32 is not limited. In some embodiments, the support portion 32 can be set as a sheet structure or a boss structure, and the sheet or boss is set on the side wall of the main body 31 to support the seal 40.

[0048] In other embodiments of the present application, there may be multiple support portions 32, which are spaced apart along the circumference of the main body 31, or the support portion 32 may be provided as a continuous closed annular structure, which is provided on the outer circumference of the main body 31. The specific structure and number of the support portions 32 may be adjusted according to design requirements, as long as the support requirements for the seal 40 are met.

[0049] like Figures 2 to 4 As shown, the main body 31 includes a first support section 311 and a second support section 312 connected in sequence. A stepped surface is formed between the first support section 311 and the second support section 312. The first support section 311 is positioned adjacent to the liquid cooling plate 10, and the seal 40 is mounted on the second support section 312. The stepped surface forms the support portion 32. The end of the first support section 311 adjacent to the liquid cooling plate 10 forms the fixed end 301, while the end of the first support section 311 distal from the liquid cooling plate 10 forms the connecting end 302. This arrangement simplifies the structure of the bracket 30 and facilitates fabrication. Furthermore, the stepped surface enhances the structural strength of the support portion 32, further improving its support for the seal 40 and the spacing between the liquid cooling plate 10 and the base plate 20. Furthermore, the seal 40 is positioned on the second support section 312. When the base plate 20 is compressed and secured by fasteners and the connecting end, the seal 40 is more effectively deformed, thereby achieving a better sealing effect.

[0050] Specifically, there is a positioning structure between the fixed end 301 and the liquid cooling plate 10. Through the above-mentioned arrangement, it is possible to provide installation guidance and quick positioning for the fixed end 301 and the liquid cooling plate 10 when assembling them, thereby reducing the occurrence of misaligned installation, improving assembly efficiency, and improving assembly accuracy. In addition, the positioning structure can also improve the connection stability between the fixed end 301 and the liquid cooling plate 10 during the use of the device, avoiding connection failure between the fixed end 301 and the liquid cooling plate 10, and ensuring the normal use of the device. In this application, the specific form of the positioning structure is not limited.

[0051] In some feasible embodiments of the present application, the positioning structure may include a groove and a bump, wherein the liquid cooling plate 10 is provided with a groove and the fixed end 301 has a bump. Alternatively, the bump is provided on the liquid cooling plate 10 and the fixed end 301 is provided with a groove.

[0052] Optionally, the groove may be a blind hole structure in this solution, or the groove may be formed by surrounding one or more protrusions.

[0053] like Figure 2 and Figure 3 As shown, the liquid cooling plate 10 has a positioning groove 11 on one side near the base plate 20, and a positioning protrusion 3011 is provided on the end surface of the fixed end 301. The positioning protrusion 3011 is located within the positioning groove 11, and the positioning protrusion 3011 cooperates with the positioning groove 11 to form a positioning structure. This arrangement simplifies the positioning structure design, reduces processing requirements, facilitates batch processing, improves the processing efficiency of the device, and can also save production costs. Furthermore, the positioning groove 11 is provided on the liquid cooling plate 10 to facilitate welding or the placement of solder during assembly.

[0054] In this embodiment, the positioning protrusion 3011 is circular, and the positioning groove 11 is a circular groove adapted thereto.

[0055] In other embodiments, the shape of the positioning protrusion 3011 can be rectangular, pentagonal or irregular. There is no limitation on the number of the positioning protrusion 3011. Multiple positioning protrusions can be provided on the fixed end 301 as long as the positioning protrusion 3011 can be positioned with the positioning groove 11.

[0056] In this embodiment, the liquid cooling plate 10 includes a first liquid cooling plate 12 and a second liquid cooling plate 13, which are welded together. The positioning protrusion 3011 and the positioning groove 11 are also welded together. This eliminates the need for additional tools when connecting the components, improving operational convenience while reducing processing costs. In other embodiments of the present application, the positioning protrusion 3011 and the positioning groove 11 can also be connected through other fixing methods such as adhesive connection and clip connection.

[0057] Battery cells 60 are placed on the liquid cooling plate 10. Cooling channels 14 are spaced apart between the first and second liquid cooling plates 12, 13. These channels are used to cool the battery cells 60. Positioning slots 11 are provided on the second liquid cooling plate 13 between adjacent cooling channels 14. This arrangement prevents the positioning structure from affecting the cooling operation of the liquid cooling plate 10 and preventing refrigerant leakage.

[0058] like Figures 1 to 3 As shown, the base plate 20 has a mounting hole 21. The connecting end 302 extends from the mounting hole 21 to the side of the base plate 20 away from the liquid cooling plate 10 and abuts against the fastener 50. With this arrangement, the connecting end 302 is inserted into the mounting hole 21. Thus, the fastener 50 is connected to the connecting end 302 and, in turn, forms a rigid connection with the base plate 20. This improves the stability and sealing of the connection between the fastener 50, the connecting end 302, and the base plate 20, thereby further enhancing the load capacity of the base plate assembly 01.

[0059] Among them, the diameter of the end face of the fastener 50 away from the base plate 20 is larger than the diameter of the mounting hole, so that the end face of the fastener 50 abuts against the surface of the base plate 20, and the bracket 30 cooperates with the seal 40 from the inside of the base plate 20 to abut the surface of the base plate 20 with the end face of the fastener 50 to achieve the fixing effect of the base plate 20.

[0060] Specifically, the mounting hole 21 has a threaded structure, the fastener 50 is a bolt, and the fastener 50 is threadedly connected to the connecting end 302. This arrangement facilitates the connection between the base plate 20 and the bracket 30, and is convenient for assembly and disassembly.

[0061] Another embodiment of the present invention provides a base plate assembly. Unlike the above embodiment, base plate 20 has a mounting hole 21. Base plate 20 assembly also includes a bushing, which is located in mounting hole 21. Fastener 50 passes through the bushing and is connected to connecting end 302. One end of the bushing abuts connecting end 302, and the other end of the bushing abuts fastener 50. At this time, the end surface of connecting end 302 abuts base plate 20, while the end surface of connecting end 302 does not abut fastener 50. Connecting end 302 abuts fastener 50 through the bushing, and fastener 50 is locked to base plate 20 through the bushing. Through this solution, fastener 50 can form a hard connection with base plate 20 through the bushing, thereby ensuring the structural stability of base plate assembly 01.

[0062] Specifically, in this application, when the base plate 20 is made of a relatively hard material, such as metal, the fastener 50 can be rigidly connected to the base plate 20, and a bushing may not be provided. When the base plate 20 is made of a relatively low hardness, such as a plastic composite material, a bushing is required to ensure a rigid connection between the fastener 50 and the base plate 20. The selection of a bushing can be made based on the material of the base plate 20 and the specific working conditions.

[0063] The seal 40 includes a sealing ring that has an interference fit with the second support segment 312 and can seal the gap between the bracket 30 and the base plate 20. This configuration increases the contact area between the seal 40, the bracket 30, and the base plate 20, thereby further improving the sealing effect of the seal 40.

[0064] Furthermore, the outer diameter of the sealing ring is larger than the diameter of the mounting hole 21, which in turn is larger than the diameter of the connecting end 302. This arrangement allows the sealing ring to form an effective seal between the base plate 20 and the bracket 30. Providing a gap between the mounting hole 21 and the connecting end 302 facilitates alignment of the fastener 50 with the bracket 30 during installation of the bracket 30, base plate 20, and fastener 50, thereby making installation more convenient and rapid.

[0065] In this embodiment, there is no limitation on the number of sealing rings, which may be 2, 3, or 5.

[0066] Preferably, the base plate 20 is a flat plate structure. This eliminates the need for a mold when manufacturing the base plate 20, further simplifying the processing of the base plate 20 and saving production costs for the base plate assembly 01. Furthermore, the structural strength of the base plate 20 can be ensured.

[0067] Another embodiment of the present invention provides a battery pack, wherein the battery pack 02 includes: a box body and a battery cell 60. The box body includes a cover plate, a surrounding plate and the bottom plate assembly 01 mentioned in the above embodiment. The surrounding plate is arranged along the edge of the bottom plate 20 assembly, and the cover plate, the surrounding plate and the bottom plate 20 assembly cooperate to form a receiving cavity. The battery cell 60 is arranged in the receiving cavity. Through the above arrangement, in the process of processing the battery pack, there is no need to process pits on the bottom plate 20, thereby improving the structural strength of the bottom plate assembly 01, which not only improves the service life of the battery pack, but also reduces the processing requirements and production costs of the entire battery pack, thereby improving the production efficiency of the battery pack.

[0068] Specifically, when assembling the base plate assembly 01 provided in the present application, first, a positioning groove 11 is opened on the second liquid cooling plate 13, and then the positioning protrusion 3011 on the fixed end 301 is installed in the positioning groove 11, and the bracket 30 is welded to the liquid cooling plate 10, and then the seal 40 is installed on the support part 32, and then the mounting hole 21 on the base plate 20 is passed through the connecting end 302, and finally the fastener 50 is installed to lock the base plate 20 to the bracket 30, and finally a fixed connection between the base plate 20 and the liquid cooling plate 10 is achieved.

[0069] The technical solution provided by this application has the following advantages:

[0070] 1. The base plate can be made into a flat structure without the need for a mold, which simplifies the processing process and improves the structural strength of the base plate;

[0071] 2. The sealing surface is between the bracket and the base plate, which will not affect the sealing between the liquid cooling plate and the battery pack box, and has good sealing performance;

[0072] 3. The bolts are directly locked to the bracket to form a hard connection. If the base plate is hard enough, no bushing is needed.

[0073] 4. Reduce the required radial space and improve applicability.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0075] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0076] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0077] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0078] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A base plate assembly, characterized in that: The base plate assembly includes: Liquid cooling plate (10); A bottom plate (20) is spaced apart from the liquid cooling plate (10); a bracket (30) disposed between the liquid cooling plate (10) and the base plate (20), the bracket (30) having a fixed end (301) and a connecting end (302) disposed opposite to each other, the fixed end (301) being connected to the liquid cooling plate (10); A sealing member (40) is located between the bracket (30) and the base plate (20), one end of the sealing member (40) abuts against the bracket (30), and the other end of the sealing member (40) abuts against the base plate (20), and the sealing member (40) cooperates with the bracket (30) to support the interval between the liquid cooling plate (10) and the base plate (20); A fastener (50) is connected to the connecting end (302) of the bracket (30), and the fastener (50) cooperates with the bracket (30) to connect the base plate (20) and the liquid cooling plate (10).

2. The base plate assembly according to claim 1, wherein: The bracket (30) comprises a main body (31) and a supporting portion (32), wherein the supporting portion (32) is located on the outer periphery of the main body (31), and the sealing member (40) is sleeved on the main body (31) and located between the supporting portion (32) and the bottom plate (20).

3. The base plate assembly according to claim 2, wherein: The main body (31) includes a first supporting section (311) and a second supporting section (312) connected in sequence, a stepped surface is provided between the first supporting section (311) and the second supporting section (312), the first supporting section (311) is arranged close to the liquid cooling plate (10), the sealing member (40) is sleeved on the second supporting section (312), the stepped surface forms the supporting portion (32), an end of the first supporting section (311) close to the liquid cooling plate (10) forms the fixed end (301), and an end of the first supporting section (311) away from the liquid cooling plate (10) forms the connecting end (302).

4. The base plate assembly according to claim 1, wherein: A positioning structure is provided between the fixed end (301) and the liquid cooling plate (10).

5. The base plate assembly according to claim 4, wherein: The liquid cooling plate (10) has a positioning groove (11) on one side close to the base plate (20), and the end surface of the fixed end (301) has a positioning protrusion (3011), the positioning protrusion (3011) is located in the positioning groove (11), and the positioning protrusion (3011) cooperates with the positioning groove (11) to form the positioning structure.

6. The base plate assembly according to claim 1, wherein: The base plate (20) has a mounting hole (21), and the connecting end (302) extends from the mounting hole (21) to a side of the base plate (20) away from the liquid cooling plate (10) and abuts against the fastener (50).

7. The base plate assembly according to claim 1, wherein: The base plate (20) has a mounting hole (21), and the base plate (20) assembly further includes a bushing, which is located in the mounting hole (21), and the fastener (50) passes through the bushing and is connected to the connecting end (302), one end of the bushing abuts against the connecting end (302), and the other end of the bushing abuts against the fastener (50).

8. The base plate assembly according to claim 3, wherein: The sealing member (40) comprises a sealing ring, the sealing ring is interference-fitted with the second supporting section (312), and the sealing ring is capable of sealing the gap between the bracket (30) and the bottom plate (20).

9. The base plate assembly according to claim 8, wherein: The sealing member (40) comprises a plurality of sealing rings, which are sequentially sleeved on the second supporting section (312).

10. The base plate assembly according to claim 1, wherein: The bottom plate (20) is a flat plate structure.

11. A battery pack, characterized in that: The battery pack includes: A box body, the box body comprising a cover plate, a surrounding plate and a bottom plate assembly according to any one of claims 1 to 10, the surrounding plate being arranged along the edge of the bottom plate (20) assembly, the cover plate, the surrounding plate and the bottom plate (20) assembly cooperating to form a receiving cavity; A battery unit (60) is arranged in the accommodating cavity.

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