Battery pack and electric equipment

Abstract

The utility model relates to the technical field of battery pack structures, and discloses a battery pack and electric equipment, which comprises a box body frame, a battery pack and a battery pack, the liquid cooling plate is provided with a first surface and a second surface; the bottom protection plate is provided with a third surface and a fourth surface; the first sealing layer is arranged between the first surface and the bottom surface; the second sealing layer is arranged between the second surface and the third surface; the fastener is provided with a first fixed end and a second fixed end, the first fixed end is assembled with the box body frame, and the second fixed end is in backstop fit with the fourth surface of the bottom protection plate; the fastener is provided with a first assembly surface, a second assembly surface and a third assembly surface, the bottom surface is in backstop assembly with the first assembly surface, the second surface is in backstop assembly with the second assembly surface, and the third surface is in backstop assembly with the third assembly surface. The thicknesses of all positions of the first sealing layer and the second sealing layer are uniform, so that the sealing uniformity is ensured, and the overall sealing performance of the battery pack is improved under the condition that the bottom protection plate is freely detached.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack structures, in particular to a battery pack and electrical equipment. Background Art

[0002] Electric vehicles are one of the main development trends in the automotive field, and their safety performance has attracted much attention from the society. As the power source of electric vehicles, the safety of power batteries directly affects the safety of the entire vehicle. Fire accidents caused by flooding account for a high proportion of fire accidents in electric vehicles. Power battery sealing technology not only affects the performance of the battery, but is also directly related to the vehicle's range and safety performance.

[0003] The battery pack assembled under the chassis must at least meet the IP67 level requirements for dust and water resistance of the battery shell to ensure the waterproof sealing performance of the power battery. In addition, the ambient temperature has a crucial impact on the performance and even safety of the power battery. Ensuring a good thermal insulation design of the power battery can not only extend the service life of the power battery, improve the charging and discharging efficiency, thereby improving the performance and mileage of the electric vehicle, but also greatly reduce safety risks. Therefore, ensuring the sealing of the battery is of great significance to improving the waterproof and thermal insulation performance of the battery. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack to improve the overall sealing performance of the battery pack; the utility model also provides an electrical device using the battery pack.

[0005] In order to achieve the above object, the utility model provides a battery pack, comprising:

[0006] A box frame, wherein the box frame has a bottom surface;

[0007] A liquid cooling plate, the liquid cooling plate having a first surface facing the box frame and a second surface facing away from the box frame;

[0008] A bottom guard plate, the bottom guard plate is arranged on a side of the liquid cooling plate away from the box frame, the bottom guard plate having a third surface facing the liquid cooling plate and a fourth surface away from the liquid cooling plate;

[0009] a first sealing layer, the first sealing layer being arranged between the first surface and the bottom surface;

[0010] a second sealing layer, the second sealing layer being arranged between the second surface and the third surface;

[0011] A fastener, wherein the fastener passes through the box frame, the liquid cooling plate, the bottom guard plate, the first sealing layer and the second sealing layer, and the fastener has a first fixed end and a second fixed end, wherein the first fixed end is assembled and connected to the box frame, and the second fixed end is matched with a fourth surface stopper of the bottom guard plate;

[0012] The fastener has a first assembly surface, a second assembly surface and a third assembly surface that are spaced apart from each other from the first fixed end to the second fixed end, the bottom surface is stop-assembled with the first assembly surface, the second surface is stop-assembled with the second assembly surface, and the third surface is stop-assembled with the third assembly surface, the first sealing layer and the liquid cooling plate are arranged between the first assembly surface and the second assembly surface, and the second sealing layer is arranged between the second assembly surface and the third assembly surface.

[0013] Preferably, the fastener includes a first assembly section, a second assembly section, a third assembly section and a fourth assembly section, the first assembly section, the second assembly section and the third assembly section are a stepped shaft structure with an outer diameter increasing along the direction from the box frame to the bottom guard plate, the step surface between the first assembly section and the second assembly section forms the first assembly surface, the step surface between the second assembly section and the third assembly section forms the second assembly surface, the third assembly section and the fourth assembly section are a stepped shaft structure with an outer diameter decreasing along the direction from the box frame to the bottom guard plate, and the step surface between the third assembly section and the fourth assembly section forms the third assembly surface.

[0014] Preferably, the fastener includes a threaded rivet nut and a fastening bolt, the first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the rivet nut, the rivet nut has a collapse zone, the collapse zone is arranged on the first assembly section, the collapse zone forms the first fixed end, and the fastening bolt forms the second fixed end.

[0015] Preferably, the fastener includes a limiting nut, a fastening nut and a fastening bolt, the first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the fastening nut, the fastening nut has a threaded hole and an external thread, the external thread is arranged on the first assembly section, the limiting nut is assembled and connected to the external thread, the fastening bolt is assembled and connected to the threaded hole, the limiting nut forms the first fixed end, and the fastening bolt forms the second fixed end.

[0016] Preferably, the fastener comprises a rivet nut, the first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the rivet nut, the first assembly section and the fourth assembly section both have a collapse zone, the collapse zone of the first assembly section forms the first fixed end, and the collapse zone of the fourth assembly section forms the second fixed end.

[0017] Preferably, the fastener includes a limiting nut and a rivet nut, the first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the rivet nut, the rivet nut has an external thread, the external thread is arranged on the first assembly section, the limiting nut is assembled and connected to the external thread, the limiting nut forms the first fixed end, the rivet nut also has a collapse zone, the collapse zone is arranged on the fourth assembly section, and the collapse zone forms the second fixed end.

[0018] Preferably, the first sealing layer and the second sealing layer are both foamed layers.

[0019] Preferably, it also includes a top cover, a third sealing layer and a connecting piece, the top cover is located on the side of the box frame away from the liquid cooling plate, the third sealing layer is arranged between the top cover and the box frame, and the top cover and the box frame are assembled and connected by the connecting piece.

[0020] Preferably, the connecting member comprises a connecting nut and a connecting bolt, the connecting nut has a limiting step, and the limiting step is located between the top cover and the box frame.

[0021] The utility model also provides an electrical device, comprising the battery pack described in any of the above technical solutions.

[0022] Compared with the prior art, the battery pack and electrical equipment of the utility model embodiment have the following beneficial effects: a first sealing layer is arranged between the bottom surface of the box frame and the first surface of the liquid cooling plate, and a second sealing layer is arranged between the second surface of the liquid cooling plate and the third surface of the bottom guard plate. The first sealing layer reduces the heat exchange between the liquid cooling plate and the box frame, and the second sealing layer reduces the heat exchange between the liquid cooling plate and the bottom guard plate, thereby playing a role of heat insulation and heat preservation, and at the same time has a waterproof and dustproof effect on the battery pack; the fastener passes through the box frame, the liquid cooling plate and the bottom guard plate through the first fixed end and the second fixed end, and since the first assembly surface of the fastener is assembled with the bottom stopper of the box frame, the second assembly surface of the fastener is assembled with the bottom stopper of the box frame, and the third assembly surface of the fastener is assembled with the bottom stopper of the box frame. The second assembly surface is assembled with the second surface of the liquid cooling plate, and the third assembly surface is assembled with the third surface of the bottom guard plate. The first sealing layer and the liquid cooling plate are arranged between the first assembly surface and the second assembly surface, and the second sealing layer is arranged between the second assembly surface and the third assembly surface. The distance between the first assembly surface and the second assembly surface and the distance between the second assembly surface and the third assembly surface are both constant values, and the thickness of the liquid cooling plate is also a constant value. Therefore, after the fasteners are assembled, the compression amount of the first sealing layer and the second sealing layer is a certain value, and the thickness of each position of the first sealing layer and the second sealing layer is uniform, which ensures the uniformity of sealing and improves the overall sealing of the battery pack when the bottom guard plate is freely disassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the exploded structure of the battery pack of the utility model;

[0024] Figure 2 yes Figure 1 A schematic diagram of the structure of the battery pack after assembly;

[0025] Figure 3 It is an assembly node diagram when the connecting bolts between the top cover and the box frame of the battery pack of the utility model are not tightened;

[0026] Figure 4 yes Figure 3 Assembly node diagram after the connecting bolts between the top cover and the box frame are tightened;

[0027] Figure 5 It is an assembly node diagram of the rivet nut between the box frame and the liquid cooling plate of the battery pack of the utility model before riveting;

[0028] Figure 6 yes Figure 5 Assembly node diagram of the rivet nut between the box frame and the liquid cooling plate during the riveting process;

[0029] Figure 7 yes Figure 5 The assembly node diagram of the rivet nuts between the box frame and the liquid cooling plate after riveting;

[0030] Figure 8 yes Figure 5 A schematic diagram of the structure of a rivet nut of a battery pack;

[0031] Fig. 9 yes Figure 8 A schematic diagram of the structure of a rivet nut from another perspective;

[0032] Fig.10 yes Figure 8 A cross-sectional view of a rivet nut;

[0033] Fig.11 It is an assembly node diagram when the connecting bolts between the liquid cooling plate and the bottom guard plate of the battery pack of the utility model are not tightened;

[0034] Fig.12 yes Fig.11 Assembly node diagram of the connecting bolts between the liquid cooling plate and the bottom guard plate after tightening;

[0035] Fig.13 It is a structural schematic diagram when the fastener of the battery pack of the utility model is a fastening nut, a limit nut and a fastening bolt;

[0036] Fig.14 It is a structural schematic diagram when the fastener of the battery pack of the utility model is a rivet nut;

[0037] Fig.15 It is a structural schematic diagram when the fasteners of the battery pack of the utility model are pull rivet nuts and limit nuts.

[0038] In the figure, 1, box frame, 11, bottom surface, 2, liquid cooling plate, 21, first surface, 22, second surface, 3, bottom guard plate, 31, third surface, 32, fourth surface, 4, first sealing layer, 5, second sealing layer, 6, fastener, 61, first fixed end, 62, second fixed end, 63, first assembly surface, 64, second assembly surface, 65, third assembly surface, 66, first assembly section, 67, second assembly section, 68, third assembly section, 69, fourth assembly section, 7, rivet nut, 71, collapse zone, 72, external thread, 8, fastening bolt, 9, fastening nut, 91, threaded hole, 92, external thread, 10, limiting nut, 20, top cover, 30, third sealing layer, 40, connecting member, 41, connecting nut, 42, connecting bolt, 43, limiting step. DETAILED DESCRIPTION

[0039] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0040] The existing battery pack is formed by a box body, a bottom guard plate and a liquid cooling plate. The box body is a frame structure. The liquid cooling plate is connected and fixed to the box body. The liquid cooling plate is arranged between the box body and the bottom guard plate. A sealant is arranged between the liquid cooling plate and the box body to achieve sealing. The liquid cooling plate and the box body are connected by rivet nuts. The bottom guard plate is fixed by bolts and rivet nuts. However, due to the uncontrollable factors of rivet force, the sealant layer at different positions between the liquid cooling plate and the box body is subjected to different extrusion forces, resulting in uneven thickness of the sealant layer, which ultimately leads to poor sealing uniformity of the battery pack and affects the overall sealing of the battery pack.

[0041] A preferred embodiment of a battery pack of the utility model is as follows Figures 1 to 12 As shown, the battery pack includes a box frame 1, a liquid cooling plate 2, a bottom protective plate 3, a first sealing layer 4, a second sealing layer 5 and a fastener 6.

[0042] The box frame 1 is the main structure of the battery pack, which carries the internal components, withstands external impact, and protects other internal components. The box frame 1 is used to accommodate and assemble the battery module. The box frame 1 has a bottom surface 11, which is the end surface of the battery pack facing away from the bottom of the vehicle during assembly.

[0043] The liquid cooling plate 2 is a temperature control module of the battery pack, which plays a role in cooling and heating the battery cells. The liquid cooling plate 2 is assembled between the box frame 1 and the bottom guard plate 3. The liquid cooling plate 2 has a first surface 21 facing the box frame 1 and a second surface 22 facing away from the box frame 1, that is, the first surface 21 and the second surface 22 are facing away from each other. When the battery module is assembled in the box frame 1, it is located on the first surface 21 of the liquid cooling plate 2.

[0044] The bottom guard plate 3 is a protective structure of the battery pack, which plays a role in protecting other internal components and isolating and insulating from the outside. The bottom guard plate 3 is arranged on the side of the liquid cooling plate 2 that is away from the box frame 1. The bottom guard plate 3, the liquid cooling plate 2 and the box frame 1 are fixedly assembled by fasteners 6. The bottom guard plate 3 also has a third surface 31 facing the liquid cooling plate 2 and a fourth surface 32 facing away from the liquid cooling plate 2. After the bottom guard plate 3 is assembled, the fourth surface 32 and the fastener 6 are engaged with each other.

[0045] The first sealing layer 4 and the second sealing layer 5 are the sealing structure of the battery pack. The first sealing layer 4 is arranged between the first surface 21 of the liquid cooling plate 2 and the bottom surface 11 of the box frame 1, that is, the first sealing layer 4 is clamped and fixed by the liquid cooling plate 2 and the box frame 1. The first sealing layer 4 seals the gap between the liquid cooling plate 2 and the box frame 1, and can also reduce the heat exchange between the box frame 1 and the liquid cooling plate 2, play a role in heat insulation, and ensure the heat preservation inside the battery pack.

[0046] The second sealing layer 5 is arranged between the second surface 22 of the liquid cooling plate 2 and the third surface 31 of the bottom guard plate 3, that is, the second sealing layer 5 is clamped and fixed by the liquid cooling plate 2 and the bottom guard plate 3. The second sealing layer 5 seals the gap between the liquid cooling plate 2 and the bottom guard plate 3, plays a role of waterproofing and dustproofing, and can also reduce the heat exchange between the liquid cooling plate 2 and the bottom guard plate 3, plays a role of heat insulation, and ensures the heat preservation inside the battery pack.

[0047] The fastener 6 is used to realize the assembly between the box frame 1, the liquid cooling plate 2 and the bottom guard plate 3, and realizes sealing by squeezing the first sealing layer 4 and the second sealing layer 5, while ensuring that the bottom guard plate 3 has the function of being removable separately. The fastener 6 is arranged through the box frame 1, the liquid cooling plate 2, the bottom guard plate 3, the first sealing layer 4 and the second sealing layer 5. The box frame 1, the liquid cooling plate 2, the bottom guard plate 3, the first sealing layer 4 and the second sealing layer 5 are provided with coaxial assembly holes, and the assembly holes pass through the fastener 6.

[0048] The fastener 6 has a first fixed end 61 and a second fixed end 62, which are located at both ends of the fastener 6. The first fixed end 61 is assembled and connected to the box frame 1, and the second fixed end 62 is matched with the stopper of the fourth surface 32 of the bottom guard plate 3. The first fixed end 61 and the second fixed end 62 apply opposite extrusion forces to the box frame 1 and the bottom guard plate 3, thereby squeezing the first sealing layer 4 and the second sealing layer 5 to achieve sealing.

[0049] The fastener 6 has a first assembly surface 63, a second assembly surface 64 and a third assembly surface 65 which are spaced apart from the first fixed end 61 to the second fixed end 62. The first assembly surface 63 is stop-assembled with the bottom surface 11 of the box frame 1, the second assembly surface 64 is stop-assembled with the second surface 22 of the liquid cooling plate 2, and the third assembly surface 65 is stop-assembled with the third surface 31 of the bottom guard plate 3, thereby limiting the positions of the box frame 1, the liquid cooling plate 2 and the bottom guard plate 3 on the fastener 6. The first sealing layer 4 and the liquid cooling plate 2 are arranged between the first assembly surface 63 and the second assembly surface 64, and the second sealing layer 5 is arranged between the second assembly surface 64 and the third assembly surface 65.

[0050] The distance between the bottom surface 11 of the box frame 1 and the second surface 22 of the liquid cooling plate 2 is the thickness of the first sealing layer 4 and the liquid cooling plate 2, and the distance between the second surface 22 of the liquid cooling plate 2 and the third surface 31 of the bottom guard plate 3 is the thickness of the second sealing layer 5. Before the fastener 6 is assembled, Figure 5 and Fig.11 As shown, the first sealing layer 4 and the second sealing layer 5 are both in an expanded and uncompressed state. After the first fixing end 61 and the second fixing end 62 of the fastener 6 are assembled with the box frame 1 and the bottom guard plate 3, as shown in FIG. Figure 6 , Figure 7 and Fig.12As shown, the first assembly surface 63 contacts the bottom surface 11 of the box frame 1, the second assembly surface 64 contacts the second surface 22 of the liquid cooling plate 2, and the third assembly surface 65 contacts the third surface 31 of the bottom guard plate 3. Since the distance between the first assembly surface 63 and the second assembly surface 64 and the distance between the second assembly surface 64 and the third assembly surface 65 on the fastener 6 are both constant values, the compression amount of the first sealing layer 4 and the second sealing layer 5 is a certain value, thereby ensuring the uniformity of the sealing and ultimately ensuring the sealing of the sealing surface.

[0051] The battery pack has a first sealing layer 4 arranged between the bottom surface 11 of the box frame 1 and the first surface 21 of the liquid cooling plate 2, and a second sealing layer 5 arranged between the second surface 22 of the liquid cooling plate 2 and the third surface 31 of the bottom guard plate 3. The first sealing layer 4 reduces the heat exchange between the liquid cooling plate 2 and the box frame 1, and the second sealing layer 5 reduces the heat exchange between the liquid cooling plate 2 and the bottom guard plate 3, thereby playing a role of heat insulation and heat preservation, and at the same time has a waterproof and dustproof effect on the battery pack; the fastener 6 passes through the box frame 1, the liquid cooling plate 2 and the bottom guard plate 3 through the first fixed end 61 and the second fixed end 62 for assembly. Due to the first assembly of the fastener 6 The first and second sealing layers 4 and 5 are each provided with a stopper, and the first and second sealing layers 4 and 5 are provided with a stopper. The first and second sealing layers 4 and 5 are provided with a stopper, and the first and second sealing layers 4 and 5 are provided with a stopper. The first and second sealing layers 4 and 5 are provided with a stopper, and the first and second sealing layers 4 and 5 are provided with a stopper, and the first and second sealing layers 4 and 5 are provided with a stopper, and the second and third sealing layers 4 and 5 are provided with a stopper, and the first and second ...

[0052] Preferably, the fastener 6 includes a first assembly section 66, a second assembly section 67, a third assembly section 68 and a fourth assembly section 69, the first assembly section 66, the second assembly section 67 and the third assembly section 68 are a stepped shaft structure with an outer diameter increasing along the direction from the box frame 1 to the bottom guard plate 3, the step surface between the first assembly section 66 and the second assembly section 67 forms a first assembly surface 63, the step surface between the second assembly section 67 and the third assembly section 68 forms a second assembly surface 64, the third assembly section 68 and the fourth assembly section 69 are a stepped shaft structure with an outer diameter decreasing along the direction from the box frame 1 to the bottom guard plate 3, and the step surface between the third assembly section 68 and the fourth assembly section 69 forms a third assembly surface 65.

[0053] The first assembly section 66, the second assembly section 67, the third assembly section 68 and the fourth assembly section 69 of the fastener 6 are stepped shaft structures, which simplify the forms of the first assembly surface 63, the second assembly surface 64 and the third assembly surface 65. The length of the second assembly section 67 is the total thickness of the first sealing layer 4 and the liquid cooling plate 2 after the fastener 6 is fixedly assembled and the first sealing layer 4 is compressed. The length of the second assembly section 67 is the thickness of the second sealing layer 5 after being compressed. By controlling the length of the second assembly section 67 and the third assembly section 68, the compression amount of the first sealing layer 4 and the second sealing layer 5 can be controlled. At the same time, the first assembly section 66 can be used to assemble the box frame 1, and the second assembly section 67 can be used to assemble the bottom guard plate 3, which is convenient to use.

[0054] Preferably, the fastener 6 includes a threaded rivet nut 7 and a fastening bolt 8, the first assembly section 66, the second assembly section 67, the third assembly section 68 and the fourth assembly section 69 are all arranged on the rivet nut 7, the rivet nut 7 has a collapse zone 71, the collapse zone 71 is arranged on the first assembly section 66, the collapse zone 71 forms the first fixed end 61, and the fastening bolt 8 forms the second fixed end 62.

[0055] like Figures 5 to 12 As shown, the fastener 6 is formed by a rivet nut 7 and a fastening bolt 8, which simplifies the fastening and assembly method of the fastener 6. The rivet nut 7 has a thread inside, and the fastening bolt 8 can be threadedly assembled with the rivet nut 7. The fastening bolt 8 can drive the collapse area 71 of the rivet nut 7 to collapse and fasten the box frame 1 during the screwing process, so that the collapse area 71 forms the first fixed end 61. The bolt head of the fastening bolt 8 cooperates with the stopper of the fourth surface 32 of the bottom guard plate 3, and the fastening bolt 8 tightens the bottom guard plate 3 when it is screwed, so as to form the second fixed end 62.

[0056] Before riveting, the rivet bolts should be Figure 5 As shown, the second sealing layer 5 is in an uncompressed state, the second surface 22 of the liquid cooling plate 2 is in contact with the second assembly surface 64 of the rivet nut 7, and the bottom surface 11 of the box frame 1 is not in contact with the first assembly surface 63 of the rivet bolt; when riveting, as shown in FIG. Figure 6 As shown, the box frame 1 compresses the first sealing layer 4 under the action of the rivet force. When the bottom surface 11 of the box frame 1 contacts the first assembly surface 63 of the rivet bolt, as shown in FIG. Figure 7 As shown, the collapse zone 71 of the rivet nut 7 begins to deform until the rivet is completed, thereby achieving the connection between the box frame 1, the first sealing layer 4, and the liquid cooling plate 2.

[0057] When the bolt head of the fastening bolt 8 just contacts the fourth surface 32 of the bottom guard plate 3, Fig.11 As shown, the third sealing layer 30 is in an uncompressed state; screw the fastening bolt 8, the bottom guard plate 3 compresses the second sealing layer 5, and when the third surface 31 of the bottom guard plate 3 contacts the third assembly surface 65 of the rivet nut 7, as shown Fig.12 As shown, the second sealing layer 5 is compressed to a minimum, thereby achieving the connection and assembly of the bottom guard plate 3 and the second sealing layer 5 .

[0058] Preferably, the fastener 6 includes a limiting nut 10, a fastening nut 9 and a fastening bolt 8, the first assembly section 66, the second assembly section 67, the third assembly section 68 and the fourth assembly section 69 are all arranged on the fastening nut 9, the fastening nut 9 has a threaded hole 91 and an external thread 72, the external thread 72 is arranged on the first assembly section 66, the limiting nut 10 is assembled and connected with the external thread 72, the fastening bolt 8 is assembled and connected with the threaded hole, the limiting nut 10 forms a first fixed end 61, and the fastening bolt 8 forms a second fixed end 62.

[0059] like Fig.13 As shown, in this embodiment, the fastener 6 is formed by a limiting nut 10, a fastening nut 9 and a fastening bolt 8, which is convenient for disassembly and replacement of the fastener 6 and can adapt to battery pack structures with different wall thicknesses. The fastening bolt 8 is threadedly assembled in the threaded hole 91 of the fastening nut 9, the bolt head of the fastening bolt 8 can clamp the bottom guard plate 3, and the limiting nut 10 can clamp the box frame 1, so that the box frame 1 and the bottom guard plate 3 are fixed between the limiting nut 10 and the fastening bolt 8.

[0060] Preferably, the fastener 6 includes a rivet nut 7, and the first assembly section 66, the second assembly section 67, the third assembly section 68 and the fourth assembly section 69 are all arranged on the rivet nut 7, and the first assembly section 66 and the fourth assembly section 69 both have a collapse zone 71, and the collapse zone 71 of the first assembly section 66 forms the first fixed end 61, and the collapse zone 71 of the fourth assembly section 69 forms the second fixed end 62.

[0061] like Fig.14 As shown, the fastener 6 is formed only by the rivet nut 7, and both ends of the rivet nut 7 have a collapse zone 71. The collapse zones 71 at both ends form a first fixed end 61 and a second fixed end 62 respectively. The entire fastener 6 is an integrated structure, which can reduce looseness and noise and simplify the structure of the fastener 6.

[0062] Preferably, the fastener 6 includes a limiting nut 10 and a rivet nut 7, the first assembly section 66, the second assembly section 67, the third assembly section 68 and the fourth assembly section 69 are all arranged on the rivet nut 7, the rivet nut 7 has an external thread 72, the external thread 72 is arranged on the first assembly section 66, the limiting nut 10 is assembled and connected to the external thread 72, the limiting nut 10 forms a first fixed end 61, the rivet nut 7 also has a collapse zone 71, the collapse zone 71 is arranged on the fourth assembly section 69, and the collapse zone 71 forms a second fixed end 62.

[0063] like Fig.15As shown, the fastener 6 is formed by a limiting nut 10 and a rivet nut 7. The collapse zone 71 of the rivet nut 7 forms a second fixed end 62, and the limiting nut 10 forms a first fixed end 61. The fastener 6 can be removed inside the battery pack through the limiting nut 10, which improves safety.

[0064] Preferably, the first sealing layer 4 and the second sealing layer 5 are both foamed layers.

[0065] The foaming layer is formed of a foaming material, and the foaming material has a porous structure, which can effectively prevent heat transfer and achieve better heat insulation effect. In addition, the foaming material is light in weight, high in strength, and has better elasticity, and is easier to expand and compress. After being compressed, the first sealing layer 4 and the second sealing layer 5 have a more uniform thickness and stronger sealing performance. In this embodiment, the material of the foaming layer can be foamed silica gel, foam cotton, etc.

[0066] Preferably, it also includes a top cover 20, a third sealing layer 30 and a connector 40. The top cover 20 is located on the side of the box frame 1 away from the liquid cooling plate 2. The third sealing layer 30 is arranged between the top cover 20 and the box frame 1. The top cover 20 and the box frame 1 are assembled and connected by the connector 40.

[0067] The top cover 20 is a protective structure of the battery pack, which has the functions of protecting, insulating and isolating the internal parts from the external environment. A third sealing layer 30 is arranged between the top cover 20 and the box frame 1. The third sealing layer 30 can increase the sealing between the top cover 20 and the box frame 1, and play a role in waterproofing, dustproofing and heat insulation. In this embodiment, the material of the third sealing layer 30 is the same as that of the first sealing layer 4 and the second sealing layer 5, both of which are foaming layers.

[0068] Preferably, the connecting member 40 includes a connecting nut 41 and a connecting bolt 42 . The connecting nut 41 has a limiting step 43 . The limiting step 43 is located between the top cover 20 and the box frame 1 .

[0069] The connecting member 40 is formed by a connecting nut 41 and a connecting bolt 42, and can be applied to the top cover 20 structure of different thicknesses. The connecting nut 41 has a limiting step 43, such as Figure 3 and Figure 4 As shown, after the connecting bolt 42 is screwed and tightened in the connecting nut 41, the limiting step 43 is clamped between the top cover 20 and the box frame 1. The thickness of the limiting step 43 is the thickness of the third sealing layer 30. The compression amount of the third sealing layer 30 can be controlled, so that the thickness of the second sealing layer 5 is uniform everywhere, thereby improving the overall sealing of the battery pack.

[0070] The utility model further provides an embodiment of an electric device, including a battery pack. The specific structure of the battery pack is the same as the specific structure of the battery pack in any of the above embodiments, and will not be repeated here.

[0071] In summary, the embodiments of the utility model provide a battery pack and an electrical device, wherein a first sealing layer is arranged between the bottom surface of the box frame and the first surface of the liquid cooling plate, and a second sealing layer is arranged between the second surface of the liquid cooling plate and the third surface of the bottom guard plate. The first sealing layer reduces the heat exchange between the liquid cooling plate and the box frame, and the second sealing layer reduces the heat exchange between the liquid cooling plate and the bottom guard plate, thereby playing a role of heat insulation and heat preservation, and at the same time has a waterproof and dustproof effect on the battery pack; the fastener passes through the box frame, the liquid cooling plate and the bottom guard plate through the first fixed end and the second fixed end for assembly, and since the first assembly surface of the fastener is assembled with the bottom stopper of the box frame, and the second assembly surface is assembled with the bottom stopper of the box frame, The second surface of the liquid cooling plate is assembled, and the third assembly surface and the third surface of the bottom guard plate are assembled. The first sealing layer and the liquid cooling plate are arranged between the first assembly surface and the second assembly surface, and the second sealing layer is arranged between the second assembly surface and the third assembly surface. The distance between the first assembly surface and the second assembly surface and the distance between the second assembly surface and the third assembly surface are both constant values, and the thickness of the liquid cooling plate is also a constant value. Therefore, after the fasteners are assembled, the compression amount of the first sealing layer and the second sealing layer is a certain value, and the thickness of each position of the first sealing layer and the second sealing layer is uniform, which ensures the uniformity of sealing and improves the overall sealing of the battery pack when the bottom guard plate is freely disassembled.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A box frame, wherein the box frame has a bottom surface; A liquid cooling plate, the liquid cooling plate having a first surface facing the box frame and a second surface facing away from the box frame; A bottom guard plate, the bottom guard plate is arranged on a side of the liquid cooling plate away from the box frame, the bottom guard plate having a third surface facing the liquid cooling plate and a fourth surface away from the liquid cooling plate; a first sealing layer, the first sealing layer being arranged between the first surface and the bottom surface; a second sealing layer, the second sealing layer being arranged between the second surface and the third surface; A fastener, wherein the fastener passes through the box frame, the liquid cooling plate, the bottom guard plate, the first sealing layer and the second sealing layer, and the fastener has a first fixed end and a second fixed end, wherein the first fixed end is assembled and connected to the box frame, and the second fixed end is matched with a fourth surface stopper of the bottom guard plate; The fastener has a first assembly surface, a second assembly surface and a third assembly surface that are spaced apart from each other from the first fixed end to the second fixed end, the bottom surface is stop-assembled with the first assembly surface, the second surface is stop-assembled with the second assembly surface, and the third surface is stop-assembled with the third assembly surface, the first sealing layer and the liquid cooling plate are arranged between the first assembly surface and the second assembly surface, and the second sealing layer is arranged between the second assembly surface and the third assembly surface.

2. The battery pack according to claim 1, characterized in that: The fastener includes a first assembly section, a second assembly section, a third assembly section and a fourth assembly section. The first assembly section, the second assembly section and the third assembly section are stepped shaft structures with an outer diameter increasing along the direction from the box frame to the bottom guard plate. The step surface between the first assembly section and the second assembly section forms the first assembly surface, the step surface between the second assembly section and the third assembly section forms the second assembly surface, the third assembly section and the fourth assembly section are stepped shaft structures with an outer diameter decreasing along the direction from the box frame to the bottom guard plate, and the step surface between the third assembly section and the fourth assembly section forms the third assembly surface.

3. The battery pack according to claim 2, characterized in that: The fastener includes a threaded rivet nut and a fastening bolt, the first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the rivet nut, the rivet nut has a collapse zone, the collapse zone is arranged on the first assembly section, the collapse zone forms the first fixed end, and the fastening bolt forms the second fixed end.

4. The battery pack according to claim 2, characterized in that: The fastener includes a limiting nut, a fastening nut and a fastening bolt. The first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the fastening nut. The fastening nut has a threaded hole and an external thread. The external thread is arranged on the first assembly section. The limiting nut is assembled and connected to the external thread. The fastening bolt is assembled and connected to the threaded hole. The limiting nut forms the first fixed end, and the fastening bolt forms the second fixed end.

5. The battery pack according to claim 2, characterized in that: The fastener includes a rivet nut, the first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the rivet nut, the first assembly section and the fourth assembly section both have a collapse zone, the collapse zone of the first assembly section forms the first fixed end, and the collapse zone of the fourth assembly section forms the second fixed end.

6. The battery pack according to claim 2, characterized in that: The fastener includes a limiting nut and a rivet nut. The first assembly section, the second assembly section, the third assembly section and the fourth assembly section are all arranged on the rivet nut. The rivet nut has an external thread, which is arranged on the first assembly section. The limiting nut is assembled and connected to the external thread. The limiting nut forms the first fixed end. The rivet nut also has a collapse zone, which is arranged on the fourth assembly section. The collapse zone forms the second fixed end.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The first sealing layer and the second sealing layer are both foaming layers.

8. The battery pack according to any one of claims 1 to 6, characterized in that: It also includes a top cover, a third sealing layer and a connecting piece, wherein the top cover is located on a side of the box frame away from the liquid cooling plate, the third sealing layer is arranged between the top cover and the box frame, and the top cover and the box frame are assembled and connected via the connecting piece.

9. The battery pack according to claim 8, characterized in that: The connecting piece comprises a connecting nut and a connecting bolt, wherein the connecting nut has a limiting step, and the limiting step is located between the top cover and the box frame.

10. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 9.

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